JPH0683992U - Drainage pump - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to provide a drainage pump that can reduce bubbles mixed in drainage water, can perform smooth drainage, generate little noise, and can obtain a sufficient head. To do. [Structure] A suction port 24 is provided at a lower end portion, and the blade 30 is internally provided.
In the drainage pump in which the discharge passage 26 is provided in the pump chamber 23 that rotates, the discharge passage 26 is provided in the direction opposite to the rotation direction of the blades 30, whereby bubbles are mixed into the drainage. Therefore, the drainage can be smoothly performed, the noise is small, and a sufficient head can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drainage pump for draining drain water of an air conditioner or the like.

[0002]

[Prior art]

 In the indoor unit of an air conditioner, water in the air condenses and adheres to the heat exchanger to produce drainage during cooling. Since this drain drops along with the surrounding waste along the surface of the heat exchanger, it must be collected and drained.Therefore, a drain pan is placed at the bottom of the heat exchanger and the drain pan is drained. In addition, the waste collected in the drain pan is collected, the suction port of the pump is placed in the drain pan, the pump is driven, and the drain is discharged outside the room.

Various types of such drainage pumps have been proposed, but many of them have a suction port at the lower end and a pump main body having a laterally oriented discharge passage. The blades are rotatably installed and are rotated by a motor fixed to the upper part of the pump body. In addition, an outside air inlet is provided in the center of the upper lid that covers the upper surface of the pump body, and when the motor rotates the blades, drain water is sucked into the blades from the suction port at the lower end, and when the water is stirred The outside air forms a free surface in the center of the drain water that rises while being stirred by the blades.

Drain water that is agitated by the rotating blades and is given a dynamic pressure to rise is pushed to the side of the pump chamber into a discharge passage that extends horizontally in the radial direction from the center of the pump chamber, and the end of the discharge passage is discharged. The dynamic pressure is converted to static pressure at the discharge port to the drain pipe that rises upward from the section and is discharged to the outside through the drain pipe.

[0005]

[Problems to be solved by the device]

 In the above conventional drainage pump, the drain water that is agitated by the blades that rotate in the pump chamber and rotates while forming a free surface in the center enters the discharge passage with kinetic energy due to its dynamic pressure when being pushed out to the discharge passage. It will be. Therefore, the drain water flowing through the discharge passage is directly affected by the turbulence when the drain water is stirred in the pump chamber, and flows with large fluctuations in pressure and flow velocity. Therefore, the discharged drain water flow hunted, and smooth drainage was not performed, and noise was generated due to fluctuations in the flow.

Further, the drain water in the pump chamber rotates by forming a substantially radial free surface, and in this free surface region, agitation and mixing of water and air occur, which causes , Air bubbles may enter the discharge passage as they are. In this way, when air bubbles are mixed in the discharged drain water, when the dynamic pressure is changed to static pressure and pushed upward at the end of the discharge path, the static bubbles crush the mixed bubbles, Since it acts as a buffer, sufficient static pressure cannot be obtained, and a sufficient head cannot be obtained, so smooth drainage is not performed and pump capacity is reduced. Moreover, the crushing of air bubbles in this way makes the flow irregular, which causes hunting in the flow, which prevents smooth drainage and also causes noise. .

Therefore, an object of the present invention is to provide a drainage pump capable of reducing air bubbles in drainage, smooth drainage, low noise, and sufficient head. And

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is directed to a drainage pump having a suction port at the lower end and a discharge passage provided in a pump chamber in which the blade rotates, in which the discharge passage corresponds to the rotation direction of the blade. It is installed in the opposite direction, so that it is possible to reduce the inclusion of air bubbles in the drainage, to perform smooth drainage, to reduce noise, and to obtain a sufficient head. It is the one.

[0009]

[Action]

 Since the present invention is configured as described above, when the blade rotates in the pump chamber, drain water or the like is sucked from the suction port at the lower end and the blade agitates the water. The agitated water is twisted by centrifugal force to generate a rotor vortex along the inner wall in the pump chamber. At this time, bubbles generated by mixing with the outside air introduced into the center of the pump chamber or bubbles mixed in water gather in the center of the vortex flow, and no bubbles are mixed on the inside wall surface side. Creates a swirl of fresh water. Such a vortex of water without air bubbles has a large motion energy and a large dynamic pressure, but in the opening of the discharge port formed on the inner wall surface of the pump chamber, Since the axis of the extending discharge passage is arranged approximately in the tangential direction of the inner wall toward the rotation direction of the blade, the dynamic pressure of the water rotating at the opening is hardly applied, and the dynamic pressure becomes static pressure. To be converted. As described above, the water having almost no static pressure and containing no bubbles is discharged to the outside through the discharge passage.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1 and FIG. 2, the bottom surface 2 of the pump body 1 has a substantially flat surface, and a draining cylindrical portion 3 extending upward is provided at the center thereof, and a through hole 5 is provided on the upper surface of the cylindrical portion 3. There is. A drain pipe 7 having a drain port 6 is provided upright on the side of the pump body 1, and a drain hose 19 for draining the drain to the outside is appropriately connected to the drain pipe 7. Four motor mounting parts 8, 8, 9, 9 are erected on the upper surface side of the pump body 1, and a screw hole 10 is provided on the upper end surface thereof. The bracket 12 of the motor 11 is screwed on the upper end surface. By being fixed with 13, the pump main body 1 is integrated with the motor 11 and installed in the drain pan of the air conditioner.

As shown in FIG. 2, the upper surface of the pump body 1 is provided with three screw forming bosses 15 each having a screw hole 14 formed in the lower surface thereof, and is formed in a flange 17 of a lower lid member 16 described later. The lower lid member 16 is fixed to the pump body 1 by passing a screw 20 through the hole 18 and screwing the screw 20 into the screw hole 14. On the upper surface of the pump body 1, an annular partition wall 21 is formed between the motor mounting portions 8, 9, 9 and 8 so as to surround the central draining cylinder portion 3, and the water accumulated inside the partition wall 21 is opened. Will be discharged from.

The lower lid member 16 fixed to the lower surface of the pump body 1 is provided with a pump chamber 23 accommodating the rotary blades 30 in the central portion, and a suction port 24 is provided at the lower end in the central lower portion. A suction cylinder 25 is provided. A discharge passage 26 that communicates with the pump chamber 23 is provided on the side of the lower lid member 16, and when the lower lid member 16 is attached to the pump body 1, the outlet end of the discharge portion of the pump body 1 is provided. The drainage port 6 is located.

As shown in FIG. 3A, at the position where the discharge passage 26 faces the drainage port 6, the center line T on the plane of the lower lid member 16 and the pump body 1 and the axis S of the discharge passage 26 are located. The center C of the drainage port 6 is located outside the intersection with. The position where the discharge passage 26 opens in the pump chamber 23 is arranged at a position deviated from the center line T in the rotation direction of the rotary blade 30, and the axis S of the discharge passage 26 is directed toward the rotation direction of the blade. The chamber 23 is arranged substantially tangentially.

The inner periphery of the draining cylindrical portion 3 at the center of the pump body 1 has a sufficient gap with the outer periphery of the central axis 32 of the rotating blade 30 and the outer periphery of the rotating shaft 42 driven by the motor 11, so that the draining The chamber 33 is formed.

The through hole 5 of the draining cylindrical portion 3 is formed to be larger than the outer circumference of the rotary shaft 42 so that outside air can be introduced into the pump chamber 23. On the draining chamber 43 side of the upper surface 4 of the draining cylindrical portion 3, a draining portion 44 protruding downward along the outer periphery of the lower end of the through hole 5 is provided, and the outer periphery of the draining portion 44 and the upper end of the inner periphery of the draining cylindrical portion 3 are provided. An annular cut-back portion 45 having a semicircular cross section is formed between the cut portion and the portion.

The blade 30 has a center shaft 32 having an insertion hole 31 into which the rotary shaft 42 of the motor 11 is press-fitted, and a warhead 33 and a flat plate-shaped auxiliary blade 34 provided below the center shaft 32. ing. Four flat plate-shaped large-diameter main wings 35 are provided radially above the auxiliary wings 34, and a donut-shaped disk 38 having a central opening 37 is provided on the outer peripheral portion of the upper edge 36 of the main wings 35.

The rotating shaft 42 is rotationally driven by the motor 11, and a draining plate 40 is horizontally fixed to a portion protruding upward from the through hole 5. The motor 11 is fixed to an appropriate member inside the air conditioner by a bracket 12, thereby integrally supporting the motor 11, the pump body 1, and the lower lid member 16. At this time, the lower end of the suction cylinder 25 of the lower lid member 16 is attached so as to be close to the bottom surface of the drain pan that collects the drain generated in the indoor heat exchanger of the air conditioner. In addition, when attaching the pipe leading to the bottom portion of the drain pan to the suction cylinder 25, the pipe can be attached at any position.

When the drainage pump configured as described above is operated, the drain flowing down from the heat exchanger due to the operation of the air conditioner is collected in the drain pan, and when the water level reaches the suction port 24 of the suction cylinder 25, When the motor 11 is driven, the auxiliary vanes 34 of the rotary vanes 30 rotated by the rotary shaft 42 are rotated to be sucked into the inside of the main wing 35 through the lower bullet head 33 of the central shaft 32 and to be drawn into the pump chamber 23. The centrifugal force generated by the rotation of the main wing 35 sucks up the drain while pressing the drain against the inner peripheral wall of the pump chamber 23. At this time, the outside air is introduced into the central portion of the drain that is rotated by centrifugal force through the gap between the through hole 5 and the rotating shaft 42.

In the pump chamber 23, the drain, which is pressed against the inner wall of the pump chamber 23 by the centrifugal force, enters the opening 39 of the discharge passage 26 provided in the side portion. At this time, the drain is converted from the dynamic pressure to the static pressure, and flows through the discharge passage 26 toward the discharge port 6 in a substantially static pressure state. In addition, since the outside air is introduced into the central axis side of the drain that rotates at high speed by the blades in the pump chamber 23, there is a boundary surface between the atmosphere and the gas-liquid mixing layer 27, as shown by the chain line in FIG. A free surface 28 is formed. On this free surface 28, air and drain are agitated, so that bubbles are generated. However, the centrifugal force due to the rotation of the drain pushes the drain against the inner wall of the pump chamber, while the bubbles have the force. Since it is weak, it is centrifuged and the bubbles collect on the free surface side.

At this time, the bubbles sucked together with the drain from the suction cylinder 25 are also centrifugally separated and gather on the center side. Therefore, the opening 39 of the discharge passage 26 becomes a drain in which bubbles are separated. Further, when the drain flow in the pump chamber cannot form the stable free surface 28 due to a change in the suction amount of the drain, etc., the entire drain flow may foam, but even at this time, the opening 39 still rotates. Since it is oriented in the rotating direction of the blades 30, the bubbles carried by the water flow hardly enter the rotor 39 and the opening 39 where the dynamic pressure changes to static pressure in the pump chamber. The drain flowing under static pressure in the discharge passage 26 rises in the vertical direction from the discharge port 6 and is discharged to the outside from the discharge cylinder 7 through an appropriate pipe.

On the other hand, the drain pressed against the inner wall surface of the pump chamber 23 is directed inward along the bottom surface of the pump body 1 and most of it falls again. However, depending on the situation such as the amount of water, the cylindrical portion 3 may rise along the inner wall surface of No. 3. However, most drain water can be stopped from rising in the drain chamber 43. When this drain further rises and reaches the top of the cylindrical portion 3, since the cut-back portion 45 is formed in this portion, the rising water flow is forcibly directed downward and falls. Therefore, the drain thus raised can be reliably prevented from jumping out of the through hole 5. Further, the drain that rises on the outer peripheral surface of the rotary shaft 42 by centrifugal force is prevented from further rising by the draining plate 40, and is blown outward by the centrifugal force and falls, and the drain is the upper surface of the pump 1. It is appropriately discharged from the opening 22 of the partition wall 21 provided in a ring shape.

The position where the discharge passage 26 faces the drainage port 6 may be located on the centerline T on the plane of the pump body 1 as shown in FIG. 3B. Further, as shown in FIG. 3C, it is arranged at a position deviated from the center line T in the rotation direction of the rotary blade 30, and the axis S of the discharge passage 26 is directed toward the rotation direction of the blade in the pump chamber 23. May be arranged substantially in the tangential direction, and the center C of the drainage port 6 may be located at the intersection of the center line T and the axis S. Further, as shown in FIG. 3D, the position where the discharge passage 26 faces the drainage port 6 is displaced from the center line T in the rotation direction of the rotary blade 30, and the axis S of the discharge passage 26 is You may arrange | position inward rather than the substantially tangential direction of the pump chamber 23 toward the rotation direction. Further, as shown in FIG. 3 (e), the axis S of the discharge passage 26 is deviated from the center line T in the rotational direction of the rotary vane 30 and is substantially tangential to the pump chamber 23 in the rotational direction of the vane. It may be arranged inward, and the width of the discharge passage 26 may be gradually reduced toward the drainage port 6. In this way, the position where the discharge passage 26 faces the drainage port 6 can be set to an arbitrary position where the discharge passage 26 is provided in the direction opposite to the rotation direction of the blades.

[0023]

[Effect of device]

 Since the present invention is configured as described above, the drain water that enters the discharge passage from the pump chamber is in a substantially static pressure state, the fluctuation of the flow velocity is reduced, and bubbles do not enter the discharge passage. Therefore, the fluctuation of the flow due to the crushing of the bubbles is eliminated, hunting does not occur in the drain flow, and smooth drainage can be performed. Moreover, noise is reduced by smoothing the drain flow. Further, since the drain flow contains few air bubbles, the static pressure of the drain flow can be directly used as the pump head, and a pump with a high head can be obtained.

Further, since the opening of the discharge passage to the pump chamber is provided in the direction opposite to the rotation direction of the blades, the opening area can be increased, and dust, etc. that gets into water together with the drain can be drawn to the opening. It does not hang up and become blocked.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an embodiment of the present invention.

[FIG. 3] (a), (b), (c), (d), (e)
FIG. 3 is a plan view showing each embodiment in which the discharge passage of the present invention faces the drain outlet.

[Explanation of symbols]

 1 Pump Main Body 2 Bottom Surface 3 Cylindrical Part 5 Through Hole 6 Drainage Port 7 Drainage Cylinder 8 Motor Mounting Part 9 Motor Mounting Part 11 Motor 12 Bracket 16 Lower Lid Member 17 Flange 21 Partition Wall 22 Opening 23 Pump Chamber 24 Suction Port 25 Suction Cylinder 26 Discharge Path 27 Gas-Liquid Mixing Layer 28 Free Surface 30 Blade 31 Insertion Hole 32 Center Axis 33 Warhead 34 Auxiliary Wing 35 Main Wing 36 Upper Edge 37 Center Opening 38 Donut Disk 39 Opening 32 Rotating Shaft 40 Draining Plate 42 Rotating Shaft 43 Draining chamber 44 Draining part 45 Turning part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Katsuya Taguchi 535 Sasai, Sayama City, Saitama Prefecture Saginomiya Co., Ltd. Sayama Plant

Claims (1)

[Scope of utility model registration request] 1. A drainage pump having a suction port at a lower end thereof and a discharge passage provided in a pump chamber in which blades rotate inside,
A drainage pump, wherein the discharge passage is provided in a direction opposite to a rotation direction of the blade.