CN110242582A - Pump installation - Google Patents

Abstract

The present invention provides a pump device in which, when a drain hole is provided in a case constituting a pump chamber, the reduction in the strength of the side wall portion of the case can be suppressed, and bubbles are less likely to accumulate in the drain hole. The pump device (1) has a pump chamber (9) formed between the casing (7) and the casing (8). The drain hole (42) opens at the bottom surface (90) instead of the inner peripheral surface (91) of the pump chamber. The drain hole is connected to an inner opening (43) provided on the bottom surface, and extends radially at a position offset in the axial direction (Z) from the pump chamber. Therefore, despite the structure in which the drain hole (42) is opened on the side surface (82) of the casing, it is possible to avoid a reduction in the strength of the side wall portion of the casing (8). In addition, since the inner opening (43) has an inclined surface (431) connected to the bottom surface (90) at an obtuse angle, accumulation of air bubbles in the drain hole (42) can be suppressed. Therefore, it is possible to suppress generation of abnormal sound, deterioration of pump characteristics, and damage to the impeller (2).

Description

pump device

technical field

The present invention relates to a pump device in which a drain hole is provided on a casing forming a pump chamber.

Background technique

In a non-self-contained pump device in which a motor rotates an impeller arranged in a pump chamber, a drain hole (water discharge hole) is provided in a case constituting the pump chamber in order to prevent liquid remaining in the pump chamber from freezing. In conventional pump devices, the drain hole is provided on the inner peripheral surface (radial surface) of the pump chamber. In addition, Patent Document 1 discloses a pump device in which a drain hole (drain plug hole) is provided on the bottom surface of a pump chamber to discharge circulating water.

prior art literature

patent documents

Patent Document 1: Japanese Patent No. 4168474

Contents of the invention

The technical problem to be solved by the invention

When the drain hole is provided on the inner peripheral surface of the pump chamber, the strength of the side wall portion of the casing surrounding the pump chamber on the outer peripheral side is reduced by the provision of the drain hole. Therefore, in order to avoid a decrease in the compressive strength of the case, it is necessary to increase the thickness of the side wall portion of the case in the axial direction and in the direction perpendicular to the axial direction. Therefore, in a pump device with high pressure resistance, it is difficult to reduce the thickness of the side wall portion of the casing in the axial direction and in the direction perpendicular to the axial direction, and it is difficult to reduce the size of the casing.

On the other hand, as in Patent Document 1, instead of the inner peripheral surface, drain holes may be provided in the bottom surface of the pump chamber. In this case, since the drain hole does not penetrate through the side wall portion of the case, it is possible to avoid a reduction in the strength of the side wall portion of the case. However, when the drain hole is provided on the bottom surface of the pump chamber, since the drain hole opens in a direction perpendicular to the flow direction of the circulating water in the pump chamber, air bubbles tend to accumulate in the drain hole. If air bubbles accumulate in the drain hole, it may cause abnormal sound, lower pump performance, or damage the impeller.

In view of the above problems, the technical problem of the present invention is to provide a pump device that can suppress the strength reduction of the side wall portion of the housing and prevent bubbles from accumulating in the drain hole when the drain hole is provided in the housing constituting the pump chamber.

Technical solution adopted to solve the problem

In order to solve the above-mentioned technical problems, the present invention provides a pump device including a casing constituting a pump chamber, an impeller arranged in the pump chamber, and a motor for rotating the impeller, wherein the casing has A suction port and a discharge port communicated with the pump chamber, and a drain hole arranged in a direction different from the discharge port are provided, and the inner surface of the pump chamber has a bottom surface facing the impeller in the axial direction. The drain hole is connected to an inner opening provided on the bottom surface, the inner opening has an inclined surface, and the inclined surface is connected to the bottom surface at an angle forming an obtuse angle.

In the pump device of the present invention, since the drain hole opens on the bottom surface rather than the inner peripheral surface of the pump chamber, the drain hole may not penetrate through the side wall portion of the casing surrounding the pump chamber on the outer peripheral side. Therefore, it is possible to avoid a reduction in the strength of the side wall portion of the housing due to the provision of the drain hole. Therefore, the thickness of the side wall portion of the housing can be reduced in the axial direction and in the direction perpendicular to the axial direction, and deformation or damage of the housing due to the internal pressure of the pump chamber can be suppressed. In addition, the drain hole is connected to an inner opening provided on the bottom surface of the pump chamber, and the inner opening has an inclined surface connected to the bottom surface at an obtuse angle. Therefore, even if the air bubbles reach the inner opening, the air bubbles easily flow along the inclined surface, so that the accumulation of air bubbles in the water drainage holes can be suppressed even though the water drainage holes are formed in the bottom surface. Therefore, it is possible to suppress generation of abnormal sound due to air bubbles, deterioration of pump characteristics, and damage to the impeller.

In the present invention, preferably, the inner opening is a concave portion formed on the bottom surface, the inner surface on the radially inner side of the concave portion is the inclined surface, and the drainage hole is located in the radial direction of the concave portion. The inner surface of the outer side is open. In this way, as long as the drain hole is connected to the radially outer inner surface of the concave portion, the drain hole can be extended in the radial direction at a position offset in the axial direction from the pump chamber. Therefore, despite the structure in which the drain hole is opened in the radial direction, it is possible to avoid a reduction in the strength of the side wall portion of the housing. Also, when the pump device is installed so that the drain hole is directed vertically downward, the inclined surface is a surface inclined upward in the vertical direction of the drain hole, so that accumulation of air bubbles in the drain hole can be suppressed.

In the present invention, preferably, the inclined surface is connected to a flat surface parallel to the bottom surface. In this manner, the inner opening is formed in a shape having a bottom surface (flat surface) continuous to the inclined surface. Therefore, in the mold for forming the housing, it is possible to prevent the front end of the mold part for forming the inside opening from forming a pointed shape. Therefore, the strength of the mold part can be ensured.

In the present invention, it is preferable that the connecting portion between the inner surface of the inner opening and the bottom surface is rounded. In this way, in the mold for forming the casing, the mold parts for forming the inner opening can be easily produced. In addition, it is possible to reduce the flow loss when water is discharged from the pump chamber through the inner opening.

In the present invention, it is preferable that the housing has an end surface facing the opposite side in the axial direction with respect to the bottom surface, the end surface has a plurality of ribs extending radially around the suction port, At least one of the plurality of ribs is provided at a position where the drainage hole extends. In this way, the strength of the portion forming the bottom of the pump chamber can be increased by the rib. In addition, the portion where the drain hole is formed can be reinforced by the rib. Therefore, deformation or damage of the casing due to the internal pressure of the pump chamber can be suppressed.

In the present invention, preferably, the pump device includes a metal plate fixed to the housing, and the metal plate is in contact with front end surfaces of the plurality of ribs. In this way, deformation of the casing can be suppressed by the metal plate, so that deformation or damage of the casing due to the internal pressure of the pump chamber can be suppressed.

In the present invention, preferably, the housing includes a radially outward side surface and a drain hole forming portion protruding from the side surface, and a protruding portion connected to the drain hole forming portion is formed on the side surface. . In this way, the drain hole forming portion can be reinforced, and the strength of the side wall portion of the casing can be prevented from being lowered by providing the drain hole. Therefore, it is possible to suppress deformation or damage of the housing caused by the internal pressure of the pump chamber.

Invention effect

According to the present invention, since the drain hole opens on the bottom surface instead of the inner peripheral surface of the pump chamber, the drain hole can be configured so that it does not penetrate the side wall portion of the housing on the outer peripheral side of the pump chamber. Therefore, it is possible to avoid a reduction in the strength of the side wall portion of the case due to the provision of the drain hole. Therefore, the thickness of the side wall portion of the casing can be reduced in the axial direction and in the direction perpendicular to the axial direction, and deformation or damage of the casing due to the internal pressure of the pump chamber can be suppressed. In addition, the drain hole is connected to an inner opening provided on the bottom surface, and the inner opening has an inclined surface connected at an angle forming an obtuse angle with the bottom surface. Therefore, even if the air bubbles reach the inner opening, the air bubbles easily flow along the inclined surface, so that the accumulation of air bubbles in the drain holes can be suppressed despite the structure in which the drain holes are opened in the bottom surface. Therefore, it is possible to suppress generation of abnormal sound caused by air bubbles or deterioration of pump characteristics and damage of the impeller.

Description of drawings

Fig. 1 is an external perspective view of a pump device and a drain plug according to Embodiment 1 to which the present invention is applied.

2 is an exploded perspective view of the pump device according to Embodiment 1 viewed from one side in the axial direction.

3 is an exploded perspective view of the pump device according to Embodiment 1 viewed from the other side in the axial direction.

Fig. 4 is a cross-sectional view of the pump device and the drain plug according to Embodiment 1.

5 is a perspective view of a circuit board, a stator, and a partition member viewed from the other side in the axial direction.

Fig. 6 is a perspective view of the casing.

Fig. 7 is a bottom view and a top view of the housing.

FIG. 8 is an external perspective view of a pump device according to Embodiment 2. FIG.

FIG. 9 is a front view of a pump device according to Embodiment 2. FIG.

FIG. 10 is a cross-sectional view of a pump device according to Embodiment 2. FIG.

Explanation of reference signs

1, 1A...pump device, 2...impeller, 3...motor, 4...circuit board, 5...rotor, 6...stator, 7...housing (housing body), 8, 8A...housing, 9...pump chamber, 10 …seal member, 11…partition member, 11a…cylindrical portion, 11b…flange portion, 11c…bottom portion, 11d…annular convex portion, 11h…shaft holding portion, 11j…fixing protrusion, 11k…positioning protrusion, 12...Resin seal member, 13...Screw, 14...Drive magnet, 15...Sleeve, 16...Holding member, 16a...Flange part, 17...Fixed shaft, 18...Thrust bearing member, 19...Connector, 20... Suction port, 21...Suction flow path forming part, 22...Suck flow path, 23...Drive coil, 24...Stator core, 24a...Outer peripheral ring part, 24b...Salient pole part, 25...Insulator, 26...Terminal pin, 30 ...discharge port, 31...discharge channel forming part, 32...discharge channel, 40...drain outlet, 41...drain hole forming part, 42...drain hole, 43...inner opening, 44...taper surface, 60...metal plate , 61...top facing part, 62...side facing part, 63...metal plate fixing hole, 64...circular hole, 80...housing body, 81...end face, 82...side surface, 83...circular recess, 84…Annular end face, 85…Annular rib, 86, 86a, 86b, 86c…Radial rib, 87…Gate mark, 88…Fixing hole, 89…Installation portion, 90…Bottom surface, 91…Inner peripheral surface , 92...Groove, 100...Drain plug, 101...Shaft, 102...Seal member, 190...Screw, 191...Nut, 192...Screw fixing part, 193...Through hole, 431...Inclined surface, 432...Radial outside inner surface, 433, 434...circumferential inner surface, 435...bottom surface (flat part), 436...chamfered part, 811...frame part, 821...extended part, 822...weight reducing part, 831...annular step Department, 832...inner recess, C...virtual center line, Z...axis direction.

Detailed ways

Hereinafter, embodiments of a pump device to which the present invention is applied will be described with reference to the drawings.

[Embodiment 1]

(the whole frame)

FIG. 1 is an external perspective view of a pump device 1 and a drain plug 100 according to Embodiment 1 to which the present invention is applied. 2 and 3 are exploded perspective views of the pump device 1 according to Embodiment 1. FIG. 2 is an exploded perspective view viewed from one side Z1 in the axial direction Z, and FIG. 3 is an exploded perspective view viewed from the other side Z2 in the axial direction Z. In addition, FIG. 4 is a cross-sectional view of the pump device 1 and the drain plug 100 according to Embodiment 1, and is a cross-sectional view at the position AA of FIG. 1 . In this specification, the three directions of XYZ are mutually orthogonal directions. The Z direction is the axial direction of the motor 3 and the impeller 2 to be described later. In addition, let one side in the axial direction Z be Z1, the other side be Z2, one side in the X direction be X1, the other side be X2, one side in the Y direction be Y1, and The other side is set to Y2.

The pump device 1 according to Embodiment 1 is a type of pump called a waterproof pump (canned electric pump), and includes an impeller 2 and a motor 3 for rotating the impeller 2 . The motor 3 includes a rotor 5 , a stator 6 , and a circuit board 4 for controlling the motor 3 . The motor 3 is a DC brushless motor. The impeller 2 and the rotor 5 are disposed inside a casing composed of a casing 7 and a casing 8. The casing 7 is a casing body integrally formed with the stator 6 and the circuit board 4 and constitutes a part of the motor 3. The casing 8 covers the casing. 7 on the side Z1 of the axis direction Z.

The casing 7 (casing body) and the casing 8 are fixed to each other by screws 190 and nuts 191 as fixing members. In addition, the pump device 1 includes a metal plate 60 that abuts and is fixed to the housing 8 from one side Z1 in the axial direction Z. As shown in FIG. The casing 8 and the metal plate 60 are fixed on the casing 7 by common screws 190 and nuts 191 .

A fluid suction port 20 , a fluid discharge port 30 , and a drain port 40 are formed in the casing 8 . A pump chamber 9 through which fluid sucked in from the suction port 20 passes toward the discharge port 30 is formed between the housing 7 and the casing 8 . In addition, a sealing member 10 such as an O-ring for securing the airtightness of the pump chamber 9 is disposed at a junction between the housing 7 and the housing 8 (see FIG. 4 ). Housing 7 includes partition wall member 11 disposed between pump chamber 9 and stator 6 to partition pump chamber 9 from stator 6 , and resin sealing member 12 made of resin covering the lower surface and side surfaces of partition wall member 11 . The resin sealing member 12 is made of BMC (Bulk Molding Compound: Bulk Molding Compound).

As shown in FIGS. 2 and 3 , the housing 8 includes a housing main body 80 that is substantially rectangular when viewed from the axial direction Z, and mounting portions provided at three of the four corners of the housing main body 80 . 89. As shown in FIG. 1 , the mounting portion 89 protrudes radially outward from the corner portion of the case body portion 80 . The pump device 1 is mounted on the support body through a fixing hole penetrating the mounting portion 89 in the axial direction Z. As shown in FIGS. 2 and 4 , the case body portion 80 includes an end surface 81 facing one side Z1 in the axial direction Z and a side surface 82 facing radially outward. The end surface 81 is a surface facing the opposite side in the axial direction Z with respect to the bottom surface 90 of the pump chamber 9 , and is a surface on which the suction port 20 is provided. The side surface 82 includes four sides: a side surface on one side Y1 in the Y direction of the discharge port 40, a side surface on the other side Y2 in the Y direction of the discharge port 30, and a side surface on one side X1 and the other side X2 in the X direction. noodle.

(suction port, discharge port and drain port)

In the pump device 1 , a fluid suction port 20 is formed at the tip of a cylindrical suction channel forming portion 21 protruding toward one side Z1 in the axial direction Z from the center of the end surface 81 of the housing body portion 80 . A suction flow path 22 extending in the axial direction Z is formed inside the suction flow path forming portion 21 . As shown in FIG. 4 , the end portion of the suction flow path 22 on the other side Z2 in the axial direction Z opens at the center of the bottom surface 90 which is the inner surface of the pump chamber 9 on the one side Z1 in the axial direction Z. In addition, the discharge port 30 opens toward the other side Y2 in the Y direction at the front end of the discharge channel forming portion 31 protruding from the side surface facing the other side Y2 in the Y direction of the housing 8 . A discharge flow path 32 extending in the Y direction is formed inside the discharge flow path forming portion 31 (see FIG. 3 , FIG. 6 , and FIG. 7 ). The discharge flow path 32 opens to the inner peripheral surface 91 which is the radially outer inner surface of the pump chamber 9 and extends in a tangential direction to the inner peripheral surface 91 (see FIG. 7 ). The pump device 1 pumps the liquid sucked in from the center of the pump chamber 9 by the impeller 2 , and sends it out from the discharge flow path 32 in the tangential direction of the pump chamber 9 .

The drain port 40 opens toward the one side Y1 in the Y direction at the front end of the drain hole forming portion 41 protruding from the side surface facing the one Y1 direction in the Y direction of the housing main body 80 . A drain hole 42 extending in the Y direction is formed inside the drain hole forming portion 41 (see FIG. 7 ). The drain hole 42 extends radially of the pump chamber 9 . As will be described later, the drain hole 42 is connected to an inner opening 43 opened in the bottom surface 90 of the pump chamber 9 , and communicates with the pump chamber 9 through the inner opening 43 . In this embodiment, the drain port 40 faces the side opposite to the discharge port 30 . That is, the discharge port 30 faces the other side Y2 in the Y direction, and the drain port 40 faces the one side Y1 in the Y direction. As shown in FIG. 4 , the installation posture of the pump device 1 is such that one side Y1 in the Y direction is directed downward in the vertical direction (lower in the paper of FIG. 4 ), and the other side Y2 in the Y direction is directed upward in the vertical direction (Fig. 4) pose. In this installation posture, the drain hole 42 extends vertically downward from the lower end of the pump chamber 9, and the drain port 40 opens vertically downward.

As shown in FIG. 1 , a drain plug 100 is detachably attached to the drain port 40 . When the pump device 1 is used, the drain port 40 is blocked by the drain plug 100 . When the pump device 1 is not in use, when the liquid in the pump chamber 9 is drained, the drain plug 100 is removed from the drain port 40 to open the drain port 40 (see FIG. 4 ). As a result, the liquid in the pump chamber 9 is discharged from the drain hole 42 . As shown in FIG. 4 , the drain plug 100 includes a shaft portion 101 and an annular seal member 102 such as an O-ring held on the front end surface of the shaft portion 101 . A tapered surface 44 is provided on the inner surface of the drain hole 42 . The drain plug 100 is configured such that the sealing member 102 is in close contact with the tapered surface 44 over the entire circumference to close the drain hole 42 .

(motor)

As shown in FIG. 4 , the rotor 5 includes a driving magnet 14 , a cylindrical sleeve 15 , and a holding member 16 that holds the driving magnet 14 and the sleeve 15 . The holding member 16 is formed in a substantially cylindrical shape with a flange. The driving magnet 14 is fixed to the outer peripheral side of the holding member 16 , and the sleeve 15 is fixed to the inner peripheral side of the holding member 16 . The impeller 2 is fixed to the flange portion 16 a of the holding member 16 disposed on one side Z1 in the axial direction Z of the drive magnet 14 . That is, the impeller 2 is attached to the rotor 5 . The impeller 2 and the rotor 5 are arranged inside the pump chamber 9 .

The rotor 5 is rotatably supported by a fixed shaft 17 . The fixed shaft 17 extends in the axial direction Z. An end portion of the fixed shaft 17 on one side Z1 in the axial direction Z is held by the housing 8 , and an end portion of the fixed shaft 17 on the other side Z2 in the axial direction Z is held by the housing 7 . The fixed shaft 17 is inserted through the inner peripheral side of the sleeve 15 . In addition, a thrust bearing member 18 that abuts on the end surface of the sleeve 15 on one side Z1 in the axial direction Z is attached to the fixed shaft 17 . In this embodiment, the sleeve 15 functions as a radial bearing of the rotor 5 , and the sleeve 15 and the thrust bearing member 18 function as a thrust bearing of the rotor 5 .

FIG. 5 is a perspective view of the circuit board 4 , the stator 6 , and the partition member 11 viewed from the other side Z2 in the axial direction Z. As shown in FIG. As shown in FIGS. 4 and 5 , the stator 6 includes a drive coil 23 , a stator core 24 , and an insulator 25 as an insulating member, and is formed in a substantially cylindrical shape as a whole. As shown in FIG. 4 , the stator 6 is arranged on the outer peripheral side of the rotor 5 via the partition member 11 . That is, the partition wall member 11 is arranged between the rotor 5 and the stator 6 . In addition, the stator 6 is arranged such that the center line of the stator 6 coincides with the axial direction Z. As shown in FIG.

The stator core 24 is a laminated magnetic core formed by laminating thin magnetic plates made of a magnetic material. The stator core 24 of this embodiment includes an outer peripheral ring portion 24a (see FIG. 5 ) and six salient pole portions 24b (see FIG. 4 ) formed on the inner peripheral side of the outer peripheral ring portion 24a at equal angular pitches. The driving coil 23 is wound around the salient pole portion 24 b of the stator core 24 via the insulator 25 . The stator 6 includes a plurality of terminal pins 26 around which ends of the driving coil 23 are electrically connected. The terminal pins 26 are press-fitted into the insulator 25 and arranged parallel to the axial direction Z. As shown in FIG.

(next door part)

The partition wall member 11 is formed in a substantially bottomed cylindrical shape with a flange, and has a cylindrical portion 11a extending in the axial direction Z, extending from an end portion of one side Z1 in the axial direction Z of the cylindrical portion 11a toward the cylindrical portion 11a. The flange portion 11b formed to expand radially outward and the bottom portion 11c that closes the opening of the other side Z2 in the axial direction Z of the cylindrical portion 11a. The cylindrical portion 11 a is arranged to cover the outer peripheral surface of the driving magnet 14 .

As shown in FIG. 4 , a shaft holding portion 11 h that holds the end of the fixed shaft 17 on the other side Z2 in the axial direction Z is formed at the center of the bottom portion 11 c so as to protrude toward one side Z1 in the axial direction Z. In addition, a fixing protrusion 11j for fixing the circuit board 4 to the partition member 11 is formed at the center of the bottom portion 11c so as to protrude toward the other side Z2 in the axial direction Z. In addition, as shown in FIG. 5 , a positioning protrusion 11 k for positioning the circuit board 4 is formed on the bottom portion 11 c so as to protrude toward the other side Z2 in the axial direction Z.

As shown in FIG. 4 , the inner peripheral side of the partition wall member 11 and one side Z1 in the axial direction Z form the pump chamber 9 , and the pump chamber 9 is formed by the partition wall member 11 and the casing 8 . In addition, the impeller 2 and the rotor 5 are disposed on the inner peripheral side of the partition wall member 11 and on one side Z1 in the axial direction Z. The partition wall member 11 prevents the fluid in the pump chamber 9 from flowing into the positions where the stator 6 and the circuit board 4 are arranged.

(circuit board)

The circuit board 4 is a rigid board such as a glass epoxy board, and is formed in a flat plate shape. The circuit board 4 is arranged at a position closer to one side Z1 in the axial direction Z than the driving coil 23 , the stator core 24 , and the insulator 25 . In addition, the circuit board 4 is fixed to the partition wall member 11 by screws 13 (see FIGS. 4 and 5 ) screwed into the fixing protrusion 11j in a state where it is radially positioned by the fixing protrusion 11j and the positioning protrusion 11k. That is, the circuit board 4 is arranged outside the pump chamber 9 . The front end portions of the terminal pins 26 are fixed to the circuit board 4 by soldering. In addition, various electronic components not shown are mounted on the circuit board 4 .

(resin sealing parts)

The resin sealing member 12 is formed by injecting a resin material such as BMC into the partition wall member 11 to which the stator 6 and the circuit board 4 are fixed. Specifically, the partition wall member 11 to which the stator 6 and the circuit board 4 are fixed is arranged in a mold, and a resin material is injected into the mold and cured to form the resin sealing member 12 .

The resin sealing member 12 is provided to completely cover the circuit board 4, the driving coil 23, and the like to protect the circuit board 4, the driving coil 23, and the like from fluid. The resin sealing member 12 is formed in a generally bottomed cylindrical shape as a whole, and completely covers the circuit board 4, the stator 6, the cylindrical portion 11a, and the bottom 11c. Moreover, the resin sealing member 12 covers the lower surface of the flange part 11b. A connector 19 is attached to an outer peripheral end portion of the circuit board 4 . The connection portion of the connector 19 to the circuit board 4 is completely covered by the resin sealing member 12 . The outer part of the connector 19 in the radial direction is not covered by the resin sealing member 12, but is exposed on the side X1 of the X direction of the resin sealing member 12, constituting a connector portion for external connection (see FIG. 1).

(Metal plate)

The metal plate 60 includes a substantially square upper facing portion 61 viewed from the axial direction Z, and side surfaces protruding from four sides of the upper facing portion 61 toward the outer peripheral side and extending curvedly toward the other side Z2 in the axial direction Z. The opposite part 62 . The metal plate 60 is assembled so that the suction flow path forming part 21 fits in the circular hole 64 provided in the center of the upper surface opposing part 61, which is connected to the housing body part from one side Z1 in the axial direction Z. The end surface 81 of the housing body 80 is in contact with the side surface 81 , and the side surface facing portion 62 is disposed outside the side surface 82 of the case main body 80 . The deformation of the case main body 80 can be suppressed by bringing the upper surface opposing portion 61 into contact with the end surface 81 .

As shown in FIG. 2 , a plurality of ribs 86 extending radially around the suction flow path forming portion 21 are formed on an end surface 81 of one side Z1 in the axial direction Z of the housing body portion 80 . A rectangular frame portion 811 having the same height as the rib 86 is provided on the outer peripheral portion of the end surface 81 , and the outer peripheral end portion of the rib 86 is connected to the frame portion 811 . The upper surface opposing portion 61 of the metal plate 60 is in contact with the frame portion 811 and the front end surface of the rib 86 .

In the upper surface opposing portion 61 , metal plate fixing holes 63 are provided at four corners. On each side of the upper surface facing part 61, the range where the side facing part 62 is formed becomes a range except the two ends of each side, and the side facing part 62 is provided at a position where the metal plate fixing hole 63 is provided. The range on the central side. That is, the side facing portion 62 is provided at an angular position different from the angular position at which the metal plate fixing hole 63 is provided. By disposing the side facing portion 62 and the metal plate fixing hole 63 at different angular positions, it is possible to reduce the deformation of the metal plate fixing hole 63 and the inability to insert the screw 190 into the metal plate and fix it during the bending process for bending the side facing portion 62. Possibility of hole 63. In addition, it is possible to suppress a decrease in the flatness of the upper surface opposing portion 61 . Therefore, it is possible to suppress the occurrence of a gap between the upper surface opposing portion 61 and the housing 8 .

As shown in FIG. 2 , the casing 7 is substantially rectangular when viewed from the axis direction Z, and screw fixing portions 192 are provided at four corners. Through-holes 193 penetrating through the corners of the resin sealing member 12 and the corners of the flange portion 11 b in the axial direction Z are formed in the screw fixing portion 192 . The screws 190 are inserted into the metal plate fixing holes 63 provided at the four corners of the upper surface opposing part 61 and the fixing holes 88 penetrating through the four corners of the housing body part 80 along the axis direction Z, and penetrated. The through hole 193 protrudes from the screw fixing portion 192 to the other side Z2 in the axial direction Z. As shown in FIG. Then, by screwing a nut 191 into the tip of the screw 190 , the casing of the pump device 1 is formed, and the casing 8 is reinforced by the metal plate 60 .

(The structure of the connection part of the drain hole to the pump chamber)

As shown in FIG. 2 , the outer shape of a portion of one side Z1 in the axial direction Z of the housing body portion 80 is substantially square. The side surface 82 of the housing main body 80 has four directions facing one side Y and the other side Y2 in the Y direction, and one side X1 and the other side X2 in the X direction. The protruding portion 821 protruding outward. The case main body 80 forms a protruding portion 821 on the other side Z2 in the axial direction Z, and the outer shape of the other side Z2 in the axial direction Z is substantially circular (see FIG. 3 ). The case main body 80 has an overhang 821 at a portion constituting an outer peripheral side wall surrounding the pump chamber 9 , and the outer peripheral side wall surrounding the pump chamber 9 is reinforced by the overhang 821 . In addition, the overhanging portion 821 formed on the side surface in the Y1 direction of the housing body portion 80 is connected to the drain hole forming portion 41 protruding radially from the side surface, and the drain hole forming portion 41 is reinforced by the overhanging portion 821 .

As shown in FIG. 3 , a circular concave portion 83 opening on the surface of the other side Z2 in the axial direction Z of the case body portion 80 is formed inside the case body portion 80 . On the outer peripheral side of the circular concave portion 83 , an annular end surface 84 abutting against the flange portion 11 b of the partition wall member 11 is formed. A weight reducing portion 822 (refer to FIG. 2 ), which is a concave portion formed on the inner peripheral side of the protruding portion 821 , is formed on the opposite side of the annular end surface 84 in the axial direction Z. Since the flatness of the annular end surface 84 can be improved by providing the weight reducing portion 822 on the back side of the annular end surface 84 , it is possible to suppress the formation of a gap between the annular end surface 84 and the flange portion 11b. In addition, by ensuring the height of the extension portion 821 in the axial direction Z, it is possible to prevent the outer peripheral end portion of the case main body 80 from floating from the flange portion 11b at the portion where the seal member 10 is disposed between the flange portion 11b and the flange portion 11b. Airtightness cannot be ensured.

As shown in FIGS. 3 and 4 , the circular recess 83 is provided with an annular stepped portion 831 on the outer peripheral portion, and a recess is formed on the inner side of the annular stepped portion 831 toward the side Z1 closer to the axial direction Z than the annular stepped portion 831 . The inner recess 832 of the As shown in FIGS. 2 and 4 , on the partition wall member 11 constituting the housing 7 , a portion that fits inside the circular recess 83 of the case main body 80 and abuts on the annular step portion 831 in the axial direction Z is formed. Annular convex part 11d. The bottom surface of the inner concave portion 832 is the bottom surface 90 which is the inner surface on one side Z1 in the axial direction Z of the pump chamber 9 . In addition, the inner peripheral surface of the inner concave portion 832 is the inner peripheral surface 91 of the pump chamber 9 .

FIG. 6 is a perspective view of the casing 8 . A part of the discharge channel 32 is constituted by a groove formed in the annular step portion 831 of the circular recess 83 , and opens in the inner peripheral surface 91 of the pump chamber 9 in the tangential direction of the pump chamber 9 . In addition, at the center of the bottom surface 90 of the pump chamber 9 , the suction flow path 22 opens in the axial direction Z, and at the outer peripheral portion of the bottom surface 90 , an inner opening 43 connected to the drain hole 42 opens. The inner opening 43 is a recess formed in the bottom surface 90 of the pump chamber 9 . The inner surface of the inner opening 43 includes an inclined surface 431 as a radially inner inner surface, a radially outer inner surface 432 , inner surfaces 433 and 434 on one and the other sides in the circumferential direction, and a bottom surface 435 (flat surface). The inclined surface 431 is connected to the bottom surface 90 of the pump chamber 9 at an obtuse angle. In addition, a rounded chamfer 436 is provided at the connecting portion between the inner surface (inclined surface 431 and inner surfaces 433 , 434 ) of the inner opening 43 and the bottom surface 90 of the pump chamber 9 . The bottom surface 435 of the inner opening 43 is a flat surface parallel to the bottom surface 90 of the pump chamber 9 and is connected to the inclined surface 431 and the inner surfaces 432 , 433 , and 434 .

The radially outer inner surface 432 of the inner opening 43 is connected to the inner peripheral surface 91 of the pump chamber 9 . The inner peripheral surface 91 of the pump chamber 9 forms a groove 92 that is slightly recessed toward the outer peripheral side on the other side Z2 of the inner surface 432 of the inner opening 43 in the axial direction Z. face face. The drain hole 42 opens on the radially outer inner surface 432 of the inner opening 43 . The inclined surface 431 which is an inner surface on the radial inner side is provided at a position facing the inner surface 432 where the drain hole 42 opens. As shown in FIGS. 4 and 6 , when the pump device 1 is installed so that the drain port 40 is vertically downward (Y1 direction in FIG. 4 and FIG. 6 ), the inclined surface 431 is positioned at the edge of the drain hole 42. The upper part in the vertical direction (Y2 direction in FIGS. 4 and 6 ) extends obliquely upward toward the bottom surface 90 of the pump chamber 9 . Therefore, even if the air bubbles in the pump chamber 9 come to the inner opening 43 , the air bubbles easily flow along the inclined surface 431 , so that the air bubbles are less likely to accumulate in the inner opening 43 .

As shown in FIG. 4 , drain hole 42 is a flow path that opens to radially outer inner surface 432 of a recess (inner opening 43 ) formed in bottom surface 90 of pump chamber 9 and extends radially outward from inner surface 432 . That is, the drain hole 42 is a flow path extending radially at a position offset in the axial direction Z with respect to the pump chamber 9 . When the drain hole 42 is provided at such a position, the drain hole 42 does not penetrate through the part of the housing 8 surrounding the outer peripheral side of the pump chamber 9, so that the side wall portion of the housing 8 surrounding the outer peripheral side of the pump chamber 9 can be suppressed. Reduced strength.

(arrangement of the rib)

FIG. 7 is a bottom view and a top view of the casing 8 . 7( a ) is a bottom view of the casing 8 viewed from the other side Z2 in the axial direction Z, and FIG. 7( b ) is a top view of the casing 8 viewed from one side Z1 of the axial direction Z. As shown in FIG. 7( b ), one side Z1 in the axial direction Z of the casing 8 is substantially square, and fixing holes 88 are formed at four corners. In addition, eight ribs 86 extending radially around the suction flow path forming portion 21 are formed on an end surface 81 on one side Z1 in the axial direction Z of the casing 8 . Eight ribs 86 are arranged at equal angular intervals. Four ribs 86 a of the eight ribs 86 extend toward the corner where the fixing hole 88 is formed, and are formed at the same angular position as the fixing hole 88 . In addition, the other four ribs 86 b among the eight ribs 86 are formed at angular positions in the middle of the fixing holes 88 adjacent in the circumferential direction. One of the four ribs 86 b extending toward one side Y1 in the Y direction is formed at a position where the drain hole 42 extends, and is connected to the drain hole forming portion 41 . Therefore, the drain hole forming portion 41 is reinforced by the rib 86b.

As shown in FIG. 7( a ), on the bottom surface 90 of the pump chamber 9 , gate marks 87 of the mold used for injection molding the casing 8 are formed at four places. The gate marks 87 are arranged at equal angular intervals around the suction port 20 and the suction flow path 22 . In addition, the gate marks 87 at four locations are formed at angular positions where four imaginary centerlines C passing through the middle of the gate marks 87 adjacent to each other in the circumferential direction coincide with the angular positions of the fixing holes 88 . As described above, ribs 86 a are formed at angular positions of the fixing holes 88 . Therefore, the four imaginary center lines C coincide with the angular positions of the ribs 86a, respectively. In addition, the gate marks 87 at four locations are respectively formed at angular positions corresponding to one of the four ribs 86b. The imaginary center line C passing through the middle of the adjacent gate marks 87 in the circumferential direction is the position of the confluence point of the resin during injection molding, and is the position of the welding line. Therefore, the four ribs 86a are provided at positions to reinforce the portion where the fixing hole 88 is formed and to reinforce the portion where the welding line is formed.

(Main Actions and Effects of Embodiment 1)

As described above, in the pump device 1 according to Embodiment 1, since the drain hole 42 opens on the bottom surface 90 and does not open on the inner peripheral surface 91 of the pump chamber 9 , it can be configured so that the drain hole 42 does not penetrate through the outer peripheral side of the casing 8 surrounding the pump chamber 9 . side wall section. Therefore, it is possible to avoid a reduction in the strength of the side wall portion surrounding the outer peripheral side of the pump chamber 9 due to the provision of the drain hole 42 . Therefore, the thickness of the side wall portion of the casing 8 can be reduced in the axial direction Z and in the direction perpendicular to the axial direction Z, and deformation or damage of the casing 8 due to the internal pressure of the pump chamber 9 can be suppressed. In addition, the drain hole 42 is connected to the inner opening 43 provided on the bottom surface 90 , and the inner opening 43 has an inclined surface 431 connected to the bottom surface 90 at an obtuse angle. Therefore, even if the air bubbles reach the inner opening 43 , the air bubbles easily flow along the inclined surface 431 , so that the drain hole 42 can be opened in the bottom surface 90 and the accumulation of air bubbles in the drain hole 42 can be suppressed. Therefore, it is possible to suppress generation of abnormal sound due to air bubbles, deterioration of pump characteristics, and damage to the impeller 2 .

In Embodiment 1, the inner opening 43 connecting the drain hole 42 is a recess formed on the bottom surface 90, the radial inner inner surface of the recess (inner opening 43) is the inclined surface 431, and the inner surface 432 radially outer is the inclined surface. Drain holes 42 are provided. In this way, by connecting the drain hole 42 to the radially outer inner surface 432 , it is possible to extend the drain hole 42 in the radial direction at a position offset in the axial direction Z with respect to the pump chamber 9 . Therefore, it is possible to open the drain hole 42 in the radial direction while avoiding a reduction in the strength of the side wall portion of the housing 8 . In addition, when the pump device 1 is installed so that the drain hole 42 is vertically downward, the inclined surface 431 is formed as a surface inclined upwardly in the vertical direction of the drain hole 42 . Therefore, accumulation of air bubbles in the drain hole 42 can be suppressed.

In Embodiment 1, the inclined surface 431 of the inner opening 43 is connected to the bottom surface 435 which is a flat surface parallel to the bottom surface 90 of the pump chamber 9 . In this way, if the inner opening 43 has a shape having the bottom surface 435 (flat portion) connected to the inclined surface 431, in the mold for forming the housing 8, the shape of the mold parts for forming the inner opening 43 can be avoided. Form into a pointed shape. Therefore, the strength of the mold part can be ensured.

In Embodiment 1, the connecting portion between the inner surface of the inner opening 43 and the bottom surface 90 of the pump chamber 9 has a rounded shape. In this way, by making the connecting portion between surfaces into a rounded shape, it is possible to easily manufacture the mold parts for forming the inner opening 43 in the mold for forming the case 8 . In addition, it is possible to reduce the flow path loss when the water is drained from the pump chamber 9 through the inner opening 43 .

The housing 8 according to Embodiment 1 includes an end surface 81 facing the opposite side with respect to the bottom surface 90 of the pump chamber 9 , and the end surface 81 includes a plurality of ribs 86 extending radially around the suction port 20 . Therefore, the strength of the portion constituting the bottom of the pump chamber 9 can be improved by the rib 86 . In addition, since one of the plurality of ribs 86 is provided at a position where the drain hole 42 extends, the rib 86 can reinforce the portion where the drain hole 42 is formed. Therefore, deformation or damage of the casing 8 due to the internal pressure of the pump chamber 9 can be suppressed.

The housing 8 according to Embodiment 1 includes a radially outwardly facing side surface 82 , and a projecting portion 821 protruding radially outwardly is formed on the side surface 82 . In addition, a drain hole forming portion 41 is formed on a side surface in the Y1 direction of the case main body portion 80 , and an extension portion 821 is connected to the drain hole forming portion 41 . Therefore, since the drain hole forming portion 41 can be reinforced by the protruding portion 821 , it is possible to avoid a reduction in the strength of the side wall portion of the housing 8 due to the provision of the drain hole 42 . Therefore, deformation or damage of the casing 8 due to the internal pressure of the pump chamber 9 can be suppressed.

In Embodiment 1, the metal plate 60 fixed to the case 8 is provided, and the upper surface facing portion 61 of the metal plate 60 is in contact with the front end surfaces of the plurality of ribs 86 . Therefore, since deformation of the housing 8 can be suppressed by the metal plate 60 , deformation or damage of the housing 8 due to the internal pressure of the pump chamber 9 can be suppressed. In addition, the metal plate 60 includes an upper surface facing portion 61 in contact with the rib 86 and a side facing portion 62 covering the side surface 82 of the housing 8 , so that the strength of the metal plate 60 can be increased by the side facing portion 62 .

In Embodiment 1, the metal plate fixing holes 63 for passing the screws 190 for fixing to the case 8 are provided at the corners of the metal plate 60 . Furthermore, the side facing portion 62 of the metal plate 60 is provided at a different angular position from the metal plate fixing hole 63 . Therefore, when the side facing portion 62 is formed by bending the metal plate, the metal plate fixing hole 63 is less likely to be deformed, and therefore, the screw 190 cannot be passed through the metal plate fixing hole 63 to fix the metal plate 60. Sex is small. In addition, since the flatness of the upper surface facing portion 61 is less likely to be lowered, there is less possibility that a gap will be generated between the metal plate 60 and the case 8 and the reinforcement effect will be lowered.

In Embodiment 1, the gate marks 87 of the mold used for injection molding the casing 8 are formed at four places at equal intervals in the circumferential direction around the suction port 20 . Furthermore, the imaginary centerline C passing through the middle of the adjacent gate marks 87 in the circumferential direction coincides with the angular position of any one of the plurality of ribs 86 (rib 86a in Embodiment 1), and is used for fixing. The angular positions of the housing 7 (housing body) and the fixing hole 88 of the housing 8 are consistent. A virtual centerline C passing through the middle of the gate marks 87 adjacent in the circumferential direction is an angular position where a weld line is formed. In this form, since the rib 86a is formed at the angular position where the weld line is formed, the portion where the weld line is formed can be reinforced by the rib 86a. Therefore, it is possible to suppress deformation and damage of the housing 8 from the welding line. Furthermore, since the rib 86a is formed at the angular position of the fixing hole 88, the location where the fixing hole 88 is formed can be reinforced by the rib 86a. In this way, since the rib 86a reinforces the portion where the strength of the housing 8 is lowered to ensure strength, deformation and damage due to internal pressure can be suppressed.

In Embodiment 1, the gate marks 87 at four locations correspond to the angular positions of one of the plurality of ribs 86 (rib 86b in Embodiment 1), respectively. In this way, by forming the rib 86 also on the gate mark 87 , a plurality of ribs 86 can be equally arranged to enhance the reinforcing effect of the case 8 .

[Embodiment 2]

FIG. 8 is an external perspective view of a pump device 1A according to Embodiment 2. FIG. In addition, FIG. 9 is a front view of a pump device 1A according to Embodiment 2, and FIG. 10 is a cross-sectional view of the pump device 1A according to Embodiment 2 (cross-sectional view at the position BB in FIG. 9 ). Hereinafter, points different from Embodiment 1 will be described, and the same points will be assigned the same symbols as in Embodiment 1 and description will be omitted. The pump device 1A according to Embodiment 2 includes a casing 7 (casing main body) and a casing 8A covering one side Z1 of the casing 7 in the axial direction Z, but does not include a metal plate 60 for reinforcing the casing 8A. The casing 8A and the case 7 are fixed to each other by screws 190 as fixing members. As shown in FIG. 10 , the fixing hole 88 of the housing 8A is a screw hole, and the front end of the screw 190 is screwed into the fixing hole 88 instead of a nut.

As shown in FIGS. 8 and 9 , a fluid suction port 20 , a fluid discharge port 30 , and a drain port 40 are formed in the casing 8A. The drain port 40 opens at the front end of the drain hole forming portion 41 protruding from the side surface of the case 8A on one side Y1 in the Y direction. The case 8A includes a case main body 80 and attachment portions 89 formed at three corners of the case main body 80 . A plurality of ribs 86 extending radially around the suction port 20 and a plurality of ribs 85 extending annularly around the suction port 20 are formed on an end surface 81 of one side Z1 in the axial direction Z of the housing body 80 . . The annular rib 85 is connected to the drain hole forming portion 41 .

The plurality of radially extending ribs 86 includes four ribs 86a and four ribs 86b as in Embodiment 1, and the four ribs 86a are provided at the imaginary center passing through the middle of the circumferentially adjacent gate marks 87 At the same angular position as the line C, the four ribs 86b are provided at the same angular position as the gate mark 87 . The rib 86 a provided at the same angular position as the imaginary center line C is provided at the same angular position as the fixing hole 88 for fixing the housing 8A and the case 7 . Also, in Embodiment 2, the intervals between the radial ribs 86 are narrower than those in Embodiment 1, and one rib 86c is provided at each angular position between the ribs 86a and 86b. In this way, the interval between the ribs 86 is set narrow, and the reinforcing effect of the casing 8A is improved by providing the annular rib 85, so even if the metal plate 60 is not attached, deformation and damage caused by internal pressure can be suppressed. produce. In addition, an arc-shaped rib may be provided instead of the annular rib 85 . That is, ribs extending in the circumferential direction can be provided to enhance the reinforcing effect.

As shown in FIG. 10 , a pump chamber 9 is formed between the casing 8A and the casing 7 . In Embodiment 2, the inner opening 43 is formed on the bottom surface 90 of the pump chamber 9 , and the drain hole 42 opens on the radially outer inner surface of the inner opening 43 . The radially inner inner surface of the inner opening 43 is an inclined surface 431 connected to form an obtuse angle with the bottom surface 90 of the pump chamber 9 .

In this way, in the pump device 1A of the second embodiment, as in the first embodiment, the drain hole 42 opens on the bottom surface 90 instead of opening on the inner peripheral surface 91 of the pump chamber 9. The outer peripheral side of the housing 8 does not pass through the side wall portion. Therefore, a decrease in the strength of the side wall portion of the housing 8A can be avoided, so deformation or damage of the housing 8A due to the internal pressure of the pump chamber 9 can be suppressed. In addition, the drain hole 42 is connected to the inner opening 43 provided on the bottom surface 90 , and the inner opening 43 has an inclined surface 431 connected to form an obtuse angle with the bottom surface 90 . Therefore, even if the air bubbles reach the inner opening 43 , the air bubbles easily flow along the inclined surface 431 , so that the drain hole 42 can be opened in the bottom surface 90 and the accumulation of air bubbles in the drain hole 42 can be suppressed. Therefore, it is possible to suppress generation of abnormal sound due to air bubbles, deterioration of pump characteristics, and damage to the impeller 2 .

Claims (10)

1. a kind of pump installation has the shell for constituting pump chamber, the impeller for being configured at the pump chamber, the electricity for making the impeller rotation Motivation, which is characterized in that

It is provided on the housing from the suction inlet of pump chamber connection and outlet and in the side different with the outlet The drainage hole configured upwards,

The inner surface of the pump chamber has bottom surface opposed with the impeller in the axial direction,

The drainage hole is connect with the inside opening portion for being set to the bottom surface,

The inside opening portion has inclined surface, and the inclined surface is relative to the bottom surface with the obtuse-angulate angle connection of shape.

2. pump installation according to claim 1, which is characterized in that

The inside opening portion is formed at the recess portion of the bottom surface,

The inner surface of the radially inner side of the recess portion is the inclined surface, and the drainage hole is in the radial outside of the recess portion Surface opening.

3. pump installation according to claim 2, which is characterized in that

The inclined surface is connected with the planar portions for being parallel to the bottom surface.

4. pump installation according to claim 3, which is characterized in that

The inner surface in the inside opening portion and the interconnecting piece of the bottom surface are radiussed.

5. pump installation according to claim 1, which is characterized in that

The inclined surface is connected with the planar portions for being parallel to the bottom surface.

6. pump installation according to claim 1, which is characterized in that

The inner surface in the inside opening portion and the interconnecting piece of the bottom surface are radiussed.

7. pump installation described according to claim 1~any one of 6, which is characterized in that

The shell has relative to the bottom surface on the axis direction towards the end face of opposite side,

The end face has the multiple ribs extended radially centered on the suction inlet,

At least one of the multiple rib is set to the position that the drainage hole extends.

8. pump installation according to claim 7, which is characterized in that

The pump installation has the metal plate being fixed on the shell,

The metal plate is abutted with the front end face of the multiple rib.

9. pump installation according to claim 8, which is characterized in that

The shell has towards the side of radial outside and from side drainage hole forming portion outstanding,

The extension connecting with the drainage hole forming portion is formed in the side.

10. pump installation according to claim 1, which is characterized in that

The shell has towards the side of radial outside and from side drainage hole forming portion outstanding,

The extension connecting with the drainage hole forming portion is formed in the side.