JPH0720389Y2 - Reciprocating pump valve structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a valve structure for a reciprocating pump, and more specifically, a reciprocating pump which is constructed as an assembly for easy handling and can be easily removed. The present invention relates to a valve structure for a pump.

[Conventional technology]

For example, in the reciprocating pump valve disclosed in Japanese Utility Model Publication No. 61-52774,
The joint peripheral edge portion of the valve seat and the valve cage is directly fitted into the annular groove of the joint portion between the pump chamber forming body and the inlet or outlet forming body, and is sandwiched in the axial direction. In such a reciprocating pump valve, when the reciprocating pump is disassembled, that is, when the inlet or outlet forming body is removed from the pump chamber forming body, the valve seat and the valve cage are unjoined, and the parts of the reciprocating pump valve are separated. However, there is a problem that parts are easily lost and parts are easily lost.

On the other hand, in the reciprocating pump valve disclosed in Japanese Utility Model Publication No. 56-15427, the valve seat and the valve car are covered with the annular clamps from the outer sides of the peripheral portions to which they are applied to each other, and the annular clamps are connected to each other. Since it is designed to be fitted in the annular groove at the joint between the pump chamber forming body and the inlet or outlet forming body, when the reciprocating pump is disassembled, the parts of the reciprocating pump valve are separated and the parts are lost. Can be prevented.

[Problems to be solved by the device]

In the reciprocating pump valve disclosed in Japanese Utility Model Publication No. 56-15427, when chemicals such as pesticides are used, the annular holding body is fixed to the inlet or outlet forming body and the pump chamber forming body, and The pump chamber forming body cannot be removed smoothly.

The purpose of this invention is to overcome the problem of the reciprocating pump disclosed in Japanese Utility Model Publication No. 56-15427, in which the valve seat of the reciprocating pump valve and the peripheral portion of the valve cage are clamped by an annular clamping body.
In a reciprocating pump designed to prevent loss of parts of a reciprocating pump valve when the reciprocating pump is disassembled, an inlet or outlet forming body from a pump chamber forming body due to sticking of an annular holding body due to use of chemicals It is to overcome the obstacle of removal.

[Means for Solving the Problems]

In the reciprocating pump valve structure, which is the premise of this invention, the valve (4
8) is a valve seat (50), a valve basket (54), an annular holding body (49) for holding the periphery of the valve seat (50) and the valve basket (54),
A valve body (52) disposed in the valve basket (54) together with the compression coil spring (58) and pressed against the valve seat (50) by the compression coil spring (58). The annular sandwiching body (49) has an end face of the pump chamber forming body (14, 70) and an inlet or outlet forming body (16) at a joint portion between the pump chamber forming body (14, 70) and the inlet or outlet forming body (16). ) Is sandwiched in an annular groove (17) defined by the step portion.

In the reciprocating pump valve structure of the present invention, the annular holding body (49) is thermally fused on the end surface of the pump chamber forming body (14, 70) on the surface on the pump chamber forming body (14, 70) side. The teeth (65) and the recesses (67) are alternately provided on the outer peripheral portion in the circumferential direction, and are fitted in the annular groove (17).

[Action]

Recesses (67) arranged in the circumferential direction on the outer peripheral portion of the annular sandwiching body (49).
The contact area of the outer peripheral portion of the annular sandwiching body (49) with the inlet or outlet forming body (16) that defines the bottom surface of the annular groove (17) is significantly reduced by the presence of the. When it is used for the chemicals described above, the fixing force of the annular holding body (49) to the bottom surface of the annular groove (17), that is, the inlet or outlet forming body (16) is sufficiently reduced. As a result, when the reciprocating pump is disassembled, the pump chamber forming body (1
The force of removing the inlet or outlet forming body (16) from 4,70) is reduced.

As a result of the annular holding body (49) being fixed to the end surfaces of the pump chamber forming bodies (14, 70) by thermal melting, the valve body of the reciprocating pump valve (48) is circumferentially oriented even during operation of the reciprocating pump. Is prevented from rotating to the pump chamber and the annular clamp (49)
Is kept airtight.

〔Example〕

 The present invention will be described below with reference to the embodiments of the drawings.

FIG. 5 is an overall structural view of the piston pump including the valve structure of the present invention. The crankcase 10, the intake side manifold 12, the cylinder pipe 14 and the discharge side manifold 16 are
They are arranged in that order along a predetermined axis, and are adjoined and fixed to each other. The intake pipe 18 is screwed to the lower part of the intake manifold 12. The piston rod 20 extends in the range from the crankcase 10 to the cylinder pipe 14 and reciprocates by transmitting power from a crankshaft (not shown) in the crankcase 10. The oil seal 22 is fixed to the crankcase 10 so that the piston rod 20 can slide on the inner peripheral surface of the oil seal 22, and maintains the oil tightness in the crankcase 10. The seal packing 24 is fixed to the end of the intake side manifold 12 on the crankcase 10 side so that the piston rod 20 can slide on the inner peripheral surface of the seal packing 24, and maintains liquid tightness in the intake side manifold 12.

The intake valve 26 has a circular flat plate-shaped valve body 28 fixed to the piston rod 20, and a valve seat 30 disposed on the tip side of the piston rod 20 with respect to the valve body 28 and loosely fitted to the piston rod 20. is doing. On the piston rod 20, the collar 31, toward the tip side,
The valve body 28, the collar 32, the stopper 34 and the spring washer 36 are fitted in order, and the hexagonal nut 38 is screwed onto the tip end portion of the piston rod 20 to tighten and fix them in the axial direction. The stopper 34 is formed with a plurality of through holes 40 penetrating in the axial direction thereof, and the piston packing 42 is fitted on the outer periphery of the valve seat 30 and slidable on the inner periphery of the cylinder pipe 14.
The O-rings 44, 46 are fitted in annular grooves on the outer circumference of both ends of the cylinder pipe 14 in the axial direction, and maintain liquid tightness at the joints between the cylinder pipe 14 and the intake side manifold 12 and the discharge side manifold 16. There is.

The discharge valve 48 disposed in the discharge side manifold 16 is
A rubber annular holding body 49 that is held between the cylinder pipe 14 and the discharge side manifold 16, a valve body 52 that can be seated on the valve seat 50 from the side opposite to the piston rod 20, and this valve body
A valve cage 54 that accommodates 52 and is clamped in the annular groove on the inner peripheral side of the annular clamping body 49 together with the valve seat 50 at the peripheral edge, and has a plurality of through holes 53 formed in the peripheral wall, and is fixed to this valve cage 54. The valve seat 52 and the stopper 56 that restricts the movement range of the valve body 52.
And a compression coil spring 58 that presses against 50. The annular sandwiching body 49 is melted by heating at the end surface on the cylinder pipe 14 side serving as the pump chamber forming body and is melted by heating.
Is fixed to the end surface of the.

The suction port 60 is formed in the suction side manifold 12 and the suction pipe 18, the pump chamber 62 is formed in the cylinder pipe 14 between the suction valve 26 and the discharge valve 48, and the discharge port 64 is the discharge valve.
It is formed in the discharge side manifold 16 on the downstream side of 48.

In the suction stroke in which the piston rod 20 moves away from the discharge valve 48, a large pressure is applied to the valve seat 30 of the suction valve 26 from the suction port 60 side and the suction valve
Since the sliding resistance between 26 and the inner surface of cylinder 14 acts,
The valve seat 30 is pressed against the peripheral edge of the stopper 34, and a gap is created between the valve body 28 and the valve seat 30. Also, since the volume of the pump chamber 62 increases, the fluid in the pump chamber 62 (generally the fluid is water)
The pressure is small, and in the discharge valve 48, the valve body 52 is pressed against the valve seat 50 by the compression coil spring 58. Therefore, the fluid in the suction port 60 passes through the outside of the valve seat 30 of the suction valve 26,
It proceeds to the gap between the valve body 28 and the valve seat 30, and then flows into the pump chamber 62 through the radial gap between the piston rod 20 and the valve seat 30 and the through hole 40 of the stopper 34.

In the discharge stroke in which the piston rod 20 is directed toward the discharge valve 48, a large pressure acts on the valve seat 30 of the suction valve 26 from the pump chamber 62 side, so the valve seat 30 is pressed against the valve body 28 and the suction port 60 and Communication with the pump chamber 62 is cut off. Further, since the volume of the pump chamber 62 decreases, the fluid pressure in the pump chamber 62 increases, and in the discharge valve 48, the valve body 52 resists the compression coil spring 58 and forms a valve seat.
Separated from 50. Therefore, the fluid in the suction port 60 exits from the pump chamber 62 to the discharge port 64 via the discharge valve 48.

In the forced valve type piston pump equipped with such a forced valve type suction valve, the suction valve is reciprocated by the reciprocating movement of the piston packing 42.
Since the opening and closing of 26 is performed automatically, the followability of the suction valve 26 at the time of rotation of the pump, especially at high speed, is improved, and the suction valve 26
Since the fluid flows in substantially the same direction in the range from to the discharge valve 48, the inertial force of the fluid is used for packing the fluid in the pump chamber 62, and the volumetric efficiency of the forced valve piston pump is increased.

FIG. 2 is a sectional view of the annular holding body 49 along the axial direction, and FIG.
The figure is a front view of the annular holding body 49. A plurality of teeth 65 are formed on the outer circumference of the annular holding body 49 at equal angular intervals in the circumferential direction, the tip surfaces of these teeth 65 are arcuate, and recesses 67 are formed between the teeth 65. There is. Only the tip surfaces of the teeth 65 contact the peripheral surface of the annular groove 17 in which the annular holding body 49 of the discharge side manifold 16 is mounted, and the annular groove for the annular holding body 49 of the discharge side manifold 16 is formed.
The contact area between the peripheral surface of 17 and the peripheral surface of the annular holding body 49 is reduced.

In the forced valve type piston pump of FIG. 5 using the annular clamp 49 of FIGS. 2 and 3, the valve seat 50 of the discharge valve 48 and the periphery of the valve basket 54 are annular clamps made of rubber as an elastic material. It is sandwiched by the body 49, and the discharge valve 48 is already manufactured as an assembled body when the pump is assembled. The annular holding body 49 is fixed to the end surface of the cylinder pipe 14 by thermal melting on the end surface on the cylinder pipe 14 side.

Discharge side manifold for maintenance and repair of discharge valve 48
Remove 16 from cylinder pipe 14. The annular sandwiching body 49 is fixed to the cylinder pipe 14 by thermal fusion, and a recess 67 is formed on the outer peripheral surface of the annular sandwiching body 49 to reduce the contact area with the peripheral surface of the discharge side manifold 16. Therefore, the annular holding body 49 is smoothly separated from the discharge side manifold 16.

FIG. 4 is a schematic overall view of a forced valve type piston pump having a partly different structure from FIG. 5, and FIG. 1 is a detailed view of a range including the discharge valve 48 and the cylinder tip fitting 70 of FIG. FIG.

In FIG. 4, the cylinder base metal fitting 66 is interposed in the connecting portion between the intake side manifold 12 and the cylinder pipe 14, and the O-ring
68a and 68b are the cylinder pipe 14 and the intake side manifold 1
It is fitted into the annular groove 17 on the contact surface of the cylinder base metal fitting 66 with 2 and maintains liquid tightness on the contact surface. Also, the cylinder tip fitting 70 is the cylinder pipe 14 and the discharge side manifold.
The O-rings 72a and 72b, which are interposed in the connecting portion with the 16, are cylinder tip fittings with the discharge side manifold 16 and the cylinder pipe 14.
It is fitted in the annular groove 17 on the contact surface of 70 and maintains liquid tightness on the contact surface.

In FIG. 1 and FIG. 4, an annular holding body 49 of the discharge valve 48.
Is clamped in the annular groove 17 at the joint between the cylinder tip fitting 70 as the pump chamber forming body and the discharge side manifold 16 as the inlet or outlet forming body, and the end face of the cylinder tip fitting 70 side is thermally fused to the cylinder. It is fixed to the end surface of the tip fitting 70. The removal annular groove 74 is formed on the outer peripheral surface of the cylinder tip fitting 70 between the flange portion 73 of the cylinder tip fitting 70 and the O-ring 72a annular groove in the axial direction, and separates the cylinder tip fitting 70 from the cylinder pipe 14. When doing, a predetermined tool is inserted and locked. Also in the forced valve type piston pump of FIG. 4, the annular holding body 49 has an annular groove 17 for the discharge valve 48 of the discharge side manifold 16 from only the tip surfaces of the teeth 65.
Cylinder tip metal fittings by contacting the peripheral surface of the
Since it is fixed to 70, the annular holding body 49 of the discharge valve 48 smoothly separates from the discharge side manifold 16 when the cylinder tip fitting 70 and the discharge side manifold 16 are disassembled.

Not only the forced valve type but also a normal reciprocating pump can be applied to not only the discharge valve but also the suction valve.

[Effect of device]

In this invention, since the contact area of the outer peripheral portion of the annular groove with the inlet or outlet forming body that defines the bottom surface of the annular groove is greatly reduced, even when the reciprocating pump is used for chemicals such as pesticides, etc. , The fixing force of the annular holding body to the bottom surface of the annular groove, that is, the inlet or outlet forming body is sufficiently reduced, and during the disassembly work of the reciprocating pump, the inlet or outlet forming body is smoothly moved from the pump chamber forming body. It can be removed.

In this invention, since the annular holding body is fixed to the pump chamber forming body by thermal fusion, the valve body of the reciprocating pump valve is prevented from rotating in the circumferential direction even during the operation of the reciprocating pump, and the reciprocating pump is reciprocated. The function of the pump valve can be maintained well. Further, the fixation between the annular clamp body and the pump chamber forming body contributes to facilitate the centering of both when the reciprocating pump is assembled, and ensures the airtightness between the pump chamber and the annular clamp body. .

[Brief description of drawings]

1 is a detailed vertical sectional view of a range including a discharge valve and a cylinder tip fitting of FIG. 4, FIG. 2 is a sectional view of an annular clamp body along an axial direction, and FIG. 3 is a front view of the annular clamp, FIG. 4 is a schematic overall view of a forced valve type piston pump including a valve structure according to the present invention, and FIG. 5 is a front view of a valve structure according to the present invention. 1 is an overall view of a forced valve type piston pump having a structure slightly different from that of a forced valve type piston pump. 14 ... Cylinder pipe (pump chamber forming body), 16 ... Discharge side manifold (inlet or outlet forming body), 17 ... Annular groove, 48 ... Discharge valve (reciprocating pump valve), 49 ... Annular holding body , 50 ...... Valve seat, 52 ...... Valve body, 54 ...... Valve cage, 58 ...... Compression coil spring, 65 ...... Tooth, 67 ...... Recess, 70 ...... Cylinder tip metal fitting (pump chamber forming body).

Claims (3)

[Scope of utility model registration request] 1. A valve (48) comprising a valve seat (50) and a valve basket (54).
An annular holding body (49) for holding the periphery of the valve seat (50) and the valve basket (54); and a compression coil spring (58) arranged in the valve basket (54). (Five
8) includes a valve body (52) which is pressed against the valve seat (50) by the annular seating body (49) and the pump chamber forming body (14, 7).
0) and the inlet or outlet forming body (16) at the joint, the annular groove (17) defined by the end face of the pump chamber forming body (14, 70) and the step portion of the inlet or outlet forming body (16). ) In the reciprocating pump valve structure, the annular clamping body (49) is thermally fused on the surface on the pump chamber forming body (14, 70) side by the pump chamber forming body (14, 70). ) Is fixed to the end face of the reciprocating pump, and teeth (65) and recesses (67) are alternately provided on the outer peripheral portion in the circumferential direction, and the reciprocating pump is fitted in the annular groove (17). Valve structure. 2. The reciprocating pump valve structure according to claim 1, wherein the reciprocating pump is a forced valve type, and the valve (48) is a discharge valve (48). 3. The reciprocating pump valve structure according to claim 1 or 2, wherein the annular holding body (49) is made of rubber.