JPH0249434B2 - HEISHIKINOTSUKIATSURYOKUSEIGYOBEN - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is installed in a gas combustion appliance, etc., and continuously controls the outlet side gas pressure (flow rate) according to the combustion load signal, that is, the hot water temperature, room temperature, etc. The present invention relates to a proportional control type pressure control valve that allows a desired temperature to be obtained, and particularly to a valve structure of a pressure control valve with a closing function in which a function of shutting off fluid is added to the pressure control valve.

Conventional structure and its problems Pressure control valves with a closing function add a closing function to the pressure control valve to shut off fluid, thereby omitting a dedicated closing solenoid valve, making the fluid control system more compact,
This is intended to reduce costs.

A conventional pressure control valve with a closing function of this type is shown in FIG. 1 is a valve body having a valve seat 2, a fluid inlet 3, and a fluid outlet 4; 5 is a valve body having a valve portion 6 made of an elastic body at the contact portion with the valve seat 2; 7 is a base cap; It is attached to the valve body 1 via a member 8. Reference numeral 9 denotes an elastic member biased in a direction to close the valve body 5. A diaphragm 10 that operates in response to fluid pressure is mounted on the upper part of the valve body 5 along with membrane plates 11a and 11b provided above and below, as well as a shaft 12 and a fixing member 1.
3 is integrally provided. Reference numeral 14 denotes a drive unit consisting of an electromagnetic coil 15, a yoke 16, a yoke plate 17, a sliding pipe 18, a cap 19, and a plunger 20 that is provided to be able to move up and down within the sliding pipe 18. It is attached to 1.

In the pressure control valve with a closing function configured as described above,
When the electromagnetic coil 15 is not energized, the valve body 5 is urged in the valve closing direction by the elastic member 9, and the valve portion 6 made of an elastic body comes into contact with the valve seat 2 to cut off fluid. When the electromagnetic coil 15 is energized, the plunger 20 receives an electromagnetic force in the direction of opening the valve body 5, overcomes the closing force of the elastic member 9, opens the valve body 5, and is caused by the pressure on the fluid outlet 4 side. The valve opening degree is determined by the balance between the force that lifts the valve body 5 upward and the electromagnetic force. In other words, the fluid outlet 4
The side pressure can be controlled.

In order to satisfy the closing performance in such a conventional example, it is necessary to assemble the valve body 5 and the valve portion 6 made of an elastic body with high precision.

For this reason, in conventional examples, the valve body 5 is made of a lightweight material such as resin and processed by turning, or the valve body 5 is made of metal and the valve portion 6 is formed by integral molding, bonding, or other methods. As a result, mass productivity is low,
This led to an increase in processing costs and material costs.
In addition, when metal is used as the valve body 5, the mass increases, and as a result, the resonance point in the valve vibration system decreases.
This type of valve vibration tends to occur when the pressure control valve deviates from the stable valve vibration range, so there are problems such as the need for special vibration suppression measures.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a valve structure that is highly workable and mass-producible, and reduces the mass of the valve body so that valve vibration is less likely to occur. shall be.

Structure of the Invention In order to achieve this object, the valve structure of the pressure control valve with a closing function according to the present invention includes a valve body having a valve seat, a seal bead portion made of an elastic body on a sheet metal member, and a valve portion that abuts the valve seat. A valve element integrally provided, a diaphragm that operates in response to fluid pressure, a membrane plate of the diaphragm, a shaft member having a flange portion and a seal shaft, and a seal pipe that seals the outer periphery of the seal bead portion. and an elastic member that biases the valve element in the valve closing direction, and the shaft member is passed through the membrane plate, diaphragm, seal pipe, and valve element, and is clamped by a fixing member so as to be integrated. It is composed of

With this configuration, after molding the sheet metal member with a mold, a seal bead made of an elastic body and a valve part are integrally molded to form a valve element, and then the shaft member is penetrated through the seal pipe, diaphragm and membrane plate, and the shaft member and the seal pipe are inserted. The seal bead part is compressed by the sealing member to achieve a fluid seal, and since it can be constructed integrally with the fixing member, each component part can be machined separately, and complicated turning work can be made unnecessary. Furthermore, since the mass of the valve body can be reduced, valve vibration can be made less likely to occur.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a cross-sectional structural view of the pressure control valve with a closing function according to the present invention, and FIG. 3 is a cross-sectional view of the main part of the valve body unit. In FIGS. 2 and 3, 1 is a valve body having a valve seat 2, 22 is a sheet metal member 23 provided with a stepped portion by press forming, and a seal bead portion 24a made of an elastic body and abutment with the valve seat 2. This is a valve element in which a valve portion 25 is integrally formed. Reference numeral 10 denotes a diaphragm that operates in response to fluid pressure, and has a seal bead portion 24b in the center, and membrane plates 11a, on the upper and lower surfaces of the diaphragm 10.
11b is provided. 26 is a shaft element having a flange portion 27 and a seal shaft 28, and 29 is a seal pipe. The shaft element 26 includes the membrane plates 11a and 11b, the seal bead portion 24b of the diaphragm 10, the seal pipe 29, the seal bead portion 24b of the valve element 22,
and an elastic member 9 that biases the valve element 22 in the valve closing direction.
The flange portion 27 passes through the central axis of the spring seat 30.
and a fixing member 13.
At this time, the seal bead portions 24a and 24b are pressed against the inner diameter by the seal shaft 28 and the outer diameter by the seal pipe 29 to form a radial seal.
Fluid leakage to the a side is completely sealed.

The other parts are the same as those of the conventional example shown in FIG. 1, so the same symbols are given and detailed explanations are omitted.

In such a configuration, when assembling the valve body unit, the membrane plate 11a and the diaphragm 1 are attached to the seal shaft 28.
0, membrane plate 11b, seal pipe 29, valve element 2
2. The assembly is completed by inserting the spring seat 30 in this order and then press-fitting the fixing member 13, making it easy to assemble. Furthermore, since each member can be constructed of sheet metal, pipes, etc., it can be carried out by a method that allows mass production such as molding, and since the mass of the valve body unit can be reduced, valve vibration, which is a problem with this type of pressure control valve, can be made less likely to occur. Furthermore, since the mounting position of the diaphragm 10 can be determined with high precision, the governor characteristics can be improved. In other words, when the mounting position of the diaphragm 10 changes, the effective pressure-receiving area changes, which causes variations in governor characteristics.
In this embodiment, the height HV from the top surface of the sheet metal member 23 to the abutment part of the valve seat 2 and the length of the seal pipe 29
Since LP can be obtained with high accuracy, variations in governor characteristics can be reduced.

FIG. 4 shows a valve element 22 of another embodiment of the invention.
This is shown in cross-sectional view, and is constructed by providing a curved surface portion 31 in the portion of the sheet metal member 23 that comes into contact with the valve seat 2. In this embodiment, when the valve part 25 made of an elastic body is integrally molded, the valve part 25 is provided with a uniform thickness along the curved surface part 31, so that the rubber flows well during molding and stabilizes the quality. This adds the processing effect of being able to do this.

Effects of the Invention As explained above, according to the pressure control valve with a closing function according to the present invention, (1) the valve element, which requires strict dimensional accuracy, is formed of a sheet metal separately from the diaphragm part, and The diaphragm and the membrane plate pass through the shaft member in the center through the seal pipe, sealing in the radial direction and being clamped and integrated by the fixing member, which improves the mass productivity of each member and facilitates assembly.

(2) Each member can be composed of sheet metal, pipes, etc.
The mass of the valve body unit can be reduced, the resonance point in the valve vibration system can be maintained at a point suitable for this type of pressure control valve, and valve vibration can be made less likely to occur.

(3) Valve units of various heights can be easily provided by changing the length of the seal pipe, so changes in specifications can be accommodated without major changes.
Also, if the length of the seal pipe is made more accurate,
The diaphragm mounting position is stable and variations in governor characteristics can be reduced.

Effects such as these can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional structural diagram of a pressure control valve with a closing function showing a conventional valve structure, FIG. 2 is a cross-sectional structural diagram of a pressure control valve with a closing function using a valve structure according to an embodiment of the present invention, and FIG. This figure is a cross-sectional structural view of the same valve body unit, and FIG. 4 is a cross-sectional structural view of a valve element showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Valve seat, 9... Elastic member, 10
...Diaphragm, 11a, 11b...Membrane plate, 13...
Fixed member, 22... Valve element, 23... Sheet metal member, 24
a... Seal bead, 25... Valve part, 26... Shaft member,
27...Flange part, 28...Seal shaft, 29...Seal pipe, 31...Curved surface part.

Claims (1)

[Scope of Claims] 1. A valve body having a valve seat, a valve element in which a seal bead portion made of an elastic body and a valve portion abutting the valve seat are integrally provided on a sheet metal member, and the valve element operates in response to fluid pressure. a diaphragm, a membrane plate of the diaphragm, a shaft member having a flange portion and a seal shaft, a seal pipe that seals the outer periphery of the seal bead portion, and an elastic member that biases the valve element in a valve closing direction. A pressure control valve with a closing function, wherein the shaft member passes through the membrane plate, diaphragm, seal pipe, and valve element, and these are clamped by the flange portion and the fixing member. 2. Claim 1 in which a curved surface portion is provided in the portion of the sheet metal member of the valve element that faces the valve seat.
Pressure control valve with a closing function as described in .