JP2004052731A - Valve device for pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce operating sound generated when a suction side check valve is seated on a valve seat. <P>SOLUTION: A retainer is inserted while interposing the valve seat in a suction valve casing and integrated. The suction side check valve is disposed in a valve chamber partitioned by the valve seat. The valve seat on which the suction side check valve is seated is made of a rubber material. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a valve device that performs a pumping operation in cooperation with a piston in a pump.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a valve device of an electromagnetic pump has been known as disclosed in JP-A-8-1899491 and JP-A-9-68157. In this example, the suction valve and the discharge valve are a suction and discharge valve unit integrated with a valve case and a lid provided with their valve seats, and are inserted and attached to holes formed in the pump body. I have. That is, the suction valve case and the discharge valve case are made of copper in old times, and are currently made of polyacetal (POM), and the valve seats are also made of the same material. The suction valve and the discharge valve are seated on this valve seat to perform a pump action.
[0003]
[Problems to be solved by the invention]
In the case of a suction valve, if the pressure in the pump chamber due to the rise of the piston drops below the pressure on the upstream side of the suction valve, the suction valve is opened, sucks fluid from the suction port, and sucks up to the top dead center of the piston. In operation, when the piston starts to descend from the top dead center, the pressure in the pump chamber increases, the suction valve is closed, and when the pressure becomes higher than the pressure downstream of the discharge valve, the fluid opens and discharges the discharge valve.
[0004]
At that time, the intake valve is seated on the valve seat, a delay time difference from the top dead center position of the piston is generated, a closing acceleration force is applied, and a phenomenon occurs in which the intake valve is beaten against the valve seat. This has the disadvantage that the pump operation noise becomes loud. In addition, metal powder in the pump tends to adhere to the metal fine powder in the pump, and the fine powder damages the valve seat, causing fluid leakage from the defective valve seat. If there is this leakage, in an electromagnetic plunger pump in which the piston reciprocates as in the conventional example, the piston stroke amount increases in proportion to the leakage amount, thereby increasing the closing acceleration force of the suction valve, and consequently, The operating sound (slap sound) was further increased.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a valve device that is easy to use while reducing the operating noise generated when an intake valve hits a valve seat.
[0006]
[Means for Solving the Problems]
A valve device for a pump according to the present invention is configured such that a retainer is inserted into a suction valve case with a valve seat interposed therebetween and integrated therewith, and a suction-side check valve is disposed in a valve chamber defined by the valve seat. Was manufactured from a rubber material (claim 1).
[0007]
For this reason, even if the suction side check valve abuts on the valve seat when the suction side check valve is closed, the closing acceleration force is absorbed by the rubber material of the valve seat, and the operating noise is reduced. In addition, the valve seat made of a rubber material is housed and integrated in the suction valve case to provide a convenient valve device.
[0008]
The rubber material of the valve sheet is fluoro rubber or oil resistant rubber (including non-adhesive rubber) (claim 2), and the suction valve case and the retainer are made of synthetic resin. (Claim 3).
[0009]
The suction valve case has a valve seat formed on the side opposite to the valve seat of the suction valve case, and has a discharge valve case having one opening connected to the side opposite to the valve seat of the suction valve case, and is defined by the suction valve case. The discharge side check valve is arranged in the valve chamber of claim 4 (claim 4). As a result, the suction valve and the discharge valve become one suction valve discharge valve unit, and a convenient valve device can be provided.
[0010]
The discharge valve case is made of synthetic resin (claim 5). The discharge valve does not cause an operation noise even if the valve seat is made of synthetic resin.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 to 3, the electromagnetic pump 1 will be described first, and then the valve device according to the present invention will be described. The electromagnetic pump 1 has an electromagnetic coil 2 to which an intermittent current (pulse current) is applied in a case 4 formed of a magnetic material such as iron. The electromagnetic coil 2 is formed by winding an electric wire around a bobbin 3 made of resin, and a through-hole formed through the center of the bobbin 3 has a guide pipe 5 made of a nonmagnetic material made of metal. Is inserted.
[0013]
A magnetic rod 8 is arranged above the guide pipe 5, and a lower end of the guide pipe 5 is inserted into a pump body 10 via an O-ring 9. The magnetic rod 8 is formed of a magnetic material such as iron. A substantially lower half of the magnetic rod 8 is inserted into the guide pipe 5 via an O-ring 11, and an upper half of the magnetic rod 8 is an O-ring. The fitting 13 is inserted into the body 34 of the discharge joint 32 described below through the inside 12, and a hole 13 penetrates the inside thereof in the vertical direction.
[0014]
The electromagnetic plunger 15 is formed in a substantially cylindrical shape with a magnetic material such as iron, and is slidably supported in an electromagnetic plunger working chamber 19 formed in the guide pipe 5 by an upper spring 16 and a lower spring 17. Have been. The electromagnetic plunger working chamber 19 is divided by the electromagnetic plunger 15 into an upper spring chamber 19a and a lower spring chamber 19b. A vertical hole 20 is formed in the electromagnetic plunger 15 in the axial direction, and communicates the upper spring chamber 19a and the lower spring chamber 19b. A piston 21 is fixed to a lower portion of the electromagnetic plunger 15.
[0015]
The piston 21 is inserted into a cylindrical cylinder 24 and reciprocates with the reciprocation of the electromagnetic plunger 15. The cylinder 24 is inserted into a hole 22 formed in the pump body 10 and communicating with the electromagnetic plunger working chamber. A flange 25 formed in the radial direction is engaged with the pump body 10 via an O-ring 23.
[0016]
In the pump chamber 30, when the tip of the piston 21 forms one surface, the reciprocating motion of the piston causes a pressure change in the chamber 30, and when the pressure becomes lower than the pressure on the upstream side of the suction side check valve 51 described below, the suction is performed. The side check valve 51 is opened to suck in the fluid, and conversely, if the pressure becomes higher than the downstream side of the discharge side check valve 74 described below, the discharge side check valve 74 is opened to discharge the fluid into the plunger working chamber 19 described above.
[0017]
The discharge joint 32 has a main body 33 and a body 34 connected to the main body 33. The body 34 is inserted into the bobbin 3 as described above, and the upper part of the magnetic rod 8 is inserted. An electromagnetic valve storage chamber 35 is formed in the body portion 34. An electromagnetic valve 36 is stored in the electromagnetic valve storage chamber 35, is pressed by a spring 37, and closes the discharge hole 39 (non-energized). At the time of energization, the ejection hole 39 is opened by being pulled toward the magnetic rod 8 side.
[0018]
The valve device 42 according to the present invention is inserted and mounted in the hole 43 formed in the pump body 10 described above, but is unitized as shown in FIG. The suction valve case 45 of the valve device 42 has a cylindrical shape, and has a small-diameter portion 46a, a medium-diameter portion 46b, and a large-diameter portion 46c from the right side in FIG. 3, and the medium-diameter portion 46b has a communication hole 47 in the radial direction. At the same time, an engagement claw 58 is formed at the right end of the large-diameter portion 46c, a valve seat 59 of the discharge-side check valve is formed at the left end of the small-diameter portion 46a, and an annular groove 60 is formed in the outer circumferential direction. And an O-ring groove 62 for the O-ring 61. The material of the suction valve case 45 is POM.
[0019]
A rubber valve seat 48 is inserted into the large-diameter portion 46c of the suction valve case 45, and a retainer 49 is fitted therein. That is, the engagement claw 58 of the suction valve case 46 is engaged with the annular groove 61 formed in the retainer 49, and the valve seat 48 is also fixed.
[0020]
The valve sheet 48 is a cylindrical member having a hole 48a at the center, and is a rubber sheet made of fluoro rubber and oil resistant rubber (including non-adhesive rubber). The retainer 49 is a cylindrical member having a hole 49 a at the center, and has an annular groove 64 and an O-ring groove 66 for the O-ring 65 on the outer periphery. The hole 49a communicates with the suction hole 50. The material of the retainer is POM.
[0021]
The suction side check valve 51 is housed in a suction side check valve storage chamber 52 defined by a valve seat 48, pressed by a spring 53, and seated on the valve seat 48. The suction-side check valve storage chamber 52 communicates with the pump chamber 30 through the communication hole 47.
[0022]
The discharge valve case 68 has a cylindrical shape, is opened on the right side as shown in FIG. 3, has an engagement claw 70 on the right end, has a communication hole 69 formed in the radial direction, and further has an O-ring 71 on the outer periphery on the left end. An opening side of the discharge valve case 68 is fitted to the left end of the suction valve case 45, and an engaging claw 70 is engaged with the annular groove 60.
[0023]
The discharge side check valve 74 is housed in a discharge side check valve housing chamber 76 defined by the suction valve case 45, and is seated on the valve seat 59 by a spring 77. The discharge-side check valve storage chamber 76 communicates with a pressure regulator 80 described below via a communication hole 69.
[0024]
The pressure adjusting device 80 is provided in a passage 81 extending from the discharge-side check valve 74 to the plunger working chamber 19, and includes a valve 82, a throttle hole 83, and a pressure-receiving plunger 84 that receives a discharge pressure. By moving the valve 82 to appropriately narrow the flow path area, a predetermined pressure is controlled from the flow rate of the flowing fluid.
[0025]
In the electromagnetic pump 1 as described above, when a pulse current having a predetermined number of pulses (50 to 60 times) is applied and the electromagnetic coil 2 is excited, the electromagnetic plunger 15 of the magnetic rod 8 resists the upper spring. The upper spring 16 stores repulsive energy. Then, when the electromagnetic coil 2 is demagnetized, the coercive force disappears and is returned downward by the repulsive energy of the upper spring 16. Such repetition causes the electromagnetic plunger 15 to reciprocate.
[0026]
The reciprocating motion of the electromagnetic plunger 15 is transmitted to the piston 21, and the piston 21, the suction-side check valve 51, and the discharge-side check valve 74 perform a pump action. That is, when the piston 21 rises, the volume of the pump chamber 30 becomes an increasing direction, the pressure in the pump chamber 30 becomes lower than the pressure in the suction hole 50, and the suction side check valve 51 is opened to suck the fluid, When the dead center is reached, the increase in the volume of the pump chamber stops, the suction of the fluid is stopped, and when the piston 21 descends, the volume of the pump chamber decreases, and the pressure in the pump chamber 30 is reduced by the discharge side check valve 74. Also, the pressure becomes higher than the pressure on the downstream side, and the discharge side check valve 74 is opened to discharge the fluid. However, even if the piston 21 enters the downward stroke, the suction-side check valve 51 does not immediately sit on the valve seat 48, and has a delay time and at the same time the closing acceleration force increases. It is beaten against the valve seat 48.
[0027]
However, since the valve seat 48 is made of a rubber material, the valve seat 48 is soft and therefore absorbs the closing acceleration force, so that the generation of sound is suppressed, and the tapping sound can be reduced as compared with the conventional example.
[0028]
【The invention's effect】
As described above, according to the present invention, since the valve seat of the suction-side check valve is made of a rubber material, it is possible to suppress the generation of a tapping sound when seated. In addition, the valve seat is housed and integrated in the suction valve case via the retainer, thereby providing a convenient valve device.
[0029]
By connecting the discharge valve case to the suction valve case to form one valve device, the valve device can be used as one component even when assembled to the pump body, and a convenient valve device can be provided. Item 4).
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an electromagnetic pump to which the present invention is applied.
FIG. 2 is a cross-sectional view of the same pump main body.
FIG. 3 is an enlarged sectional view of the valve device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 electromagnetic pump 2 electromagnetic coil 8 electromagnetic plunger 10 pump body 21 piston 30 pump chamber 42 valve device 45 suction valve case 48 valve seat 49 retainer 51 suction side check valve 68 discharge valve case 74 discharge side check valve 80 pressure regulator

Claims (5)

The retainer is inserted and integrated into the suction valve case with the valve seat interposed therebetween, and the suction-side check valve is disposed in the valve chamber defined by the valve seat, and the valve seat is manufactured from a rubber material. And the valve device of the pump. 2. The valve device for a pump according to claim 1, wherein the rubber material of the sheet is fluoro rubber or oil resistant rubber (including non-adhesive rubber). The pump valve device according to claim 1, wherein the suction valve case and the retainer are made of synthetic resin. A valve seat is formed on the non-valve seat side of the suction valve case, and a discharge valve case having one opening is connected to the non-valve seat side of the suction valve case, and discharge is performed into a valve chamber defined by the suction valve case. 2. The valve device for a pump according to claim 1, wherein a side check valve is provided. The pump valve device according to claim 4, wherein the discharge valve case is made of a synthetic resin.

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