JPH0615184Y2 - Diaphragm valve - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention is provided with a disk-shaped diaphragm whose main material is rubber sandwiched between the ends of the valve box and the control unit case, and is used for displacing the valve element provided at the center of the diaphragm. Accordingly, the present invention relates to a diaphragm valve that opens and closes a fluid passage formed in a valve box.

[Prior art]

Conventionally, in this type of device, as shown in a part of FIG. 6, the upper end of the valve box 11 is bent in the horizontal direction, the peripheral edge of the diaphragm 12 is placed on the upper end, and the lower end of the control part case 13 is placed. The portion is bent in a U-shaped cross section and caulked, and the peripheral edge portion of the diaphragm 12 is fixed so as to be sandwiched between the upper end portion of the valve box 11 and the lower end portion of the control unit case 13.

[Problems to be solved by the device]

However, in the above-mentioned conventional device, the rubber constituting the diaphragm ages and loses its elastic force (sagging) due to long-term use of the device, so that the peripheral edge of the diaphragm and the valve box or the control unit case are lost. There is a problem that the sealing function between the end of the valve and the end of the valve lowers, and the liquid flows from the inside of the valve box into the inside of the control unit case. Further, there is also a problem that the diaphragm comes off from the end portion of the valve box or the control unit case as the aging progresses further. The present invention has been made to solve the above problems, and its purpose is to allow liquid to flow from the inside of the valve box into the control case or the diaphragm to the valve box or the control case even when used for a long time. It is intended to provide a diaphragm valve having high durability that does not come off from the end of the diaphragm valve.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a structural feature of the present invention is to provide a disk-shaped diaphragm whose main material is rubber sandwiched between the respective ends of the valve box and the control unit case, In a diaphragm valve that opens and closes a fluid passage formed in the valve box according to the displacement of a valve element provided in the central part of the diaphragm, between the peripheral edge of the diaphragm and the end of the valve box or control case. This is because a metal spring member is interposed.

[Function of the device]

In the present invention configured as described above, since the metal spring member continuously pushes the peripheral portion of the diaphragm against the end of the valve box or the control unit case with a substantially constant force, the peripheral portion of the diaphragm is always It is fixed between the both ends of the valve box and the control case with a substantially constant tightening force.

[Effect of device]

As can be understood from the above description of the operation, according to the present invention, even if the rubber constituting the diaphragm ages and loses its elastic force due to long-term use, the metal spring member causes the valve to surround the diaphragm. Since it is pressed against the box or control case, the sealing function between the peripheral edge of the diaphragm and the end of the valve case or control case is kept high, and fluid does not flow from the valve box into the control case. At the same time, the diaphragm does not come off from the end of the valve box or the control unit case, so that the durability of the diaphragm valve is improved.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is used, for example, as a pressure control valve provided in a fuel supply device of a vehicle and for maintaining a constant pressure of fuel supplied to a fuel injection valve. The diaphragm valve is shown. This diaphragm valve is provided with a valve box 21 and a control unit case 22 that are both formed into a cup shape from a metal material and form a cylindrical space inside with their ends joined together. The space is defined by a diaphragm 23. It is partitioned into an oil chamber R1 on the valve box 21 side and a pressure control chamber R2 on the control unit case 22 side. An inflow pipe 21a that communicates with the oil chamber R1 is integrally provided on a side portion of the valve box 21 so as to project outward.
The outer end of a is a conduit P1 for supplying the fuel discharged by a fuel pump (not shown) to a fuel injection valve (not shown).
Is connected to the end of. An outflow pipe 21b communicating with the oil chamber R1 is integrally provided on the bottom surface of the valve box 21 so as to project inward and outward, and the lower end of the outflow pipe 21b communicates with a reservoir (not shown) at the other end. It is connected to one end of the conduit P2. The upper end of the outflow pipe 21b faces the lower surface of a disc-shaped valve body 24 fixed to the center of the lower surface of the diaphragm 23, and constitutes a valve seat 21c for the valve body 24. A coil spring 25 is housed in the pressure control chamber R2, and the spring 25 is supported at its lower end by a dish-shaped retainer 26 fixed to the center of the diaphragm 23 together with the valve body 24. The upper end of the coil spring 25 is supported by a retainer 27 having the same shape as that of the retainer 26. The retainer 27 is lowered by a bolt 31 that is threadedly attached to a nut 28 welded to the inside of the bottom surface of the control unit case 22 so as to penetrate the same bottom surface. Has been pushed to. The peripheral edge of the diaphragm 23 is placed on a collar portion 21d formed by bending the upper end of the valve box 21 in the outer horizontal direction, and
By the support plate 32 and the disc spring 33 placed on the peripheral edge portion, the lower end portion of the control unit case 22 is formed in a U-shaped cross section, and the U-shaped portion 22a engages with the flange portion 21d. It is sandwiched between the valve box 21 and the control unit case 22 and fixed by caulking. The support plate 32 is made of a metal material, and the second
As shown in the drawing, most of it is formed into an annular flat plate and is bent upward at a predetermined inclination at its inner peripheral end. The disc spring 33 is made of a metal spring material, and is formed so as to be inclined upward from the outer peripheral end toward the inner peripheral end, as shown in FIG. In the diaphragm valve having such a structure, after the assembly, the bolt 31 is rotated to adjust the elastic force of the coil spring 25 so that the diaphragm 23 can be pushed downward with a constant force. In this state, the fuel discharged from the fuel pump is
When it is supplied to the oil chamber R1 via the, the fuel in the oil chamber R1 tries to push the diaphragm 23 upward according to the pressure of the fuel. In this case, if the force of pushing down the diaphragm 23 of the coil spring 25 is larger than the force of pushing up the diaphragm 23 of the fuel in the oil chamber R1, the diaphragm 2
The central portion of 3 is displaced downward as shown in FIG. 1, and the valve element 24 is seated on the valve seat 21c and closes the upper end of the outflow pipe 21b. Communication with P2 is prohibited and the pressure of fuel in oil chamber R1 rises. On the other hand, the force of pushing up the diaphragm 23 of the fuel in the oil chamber R1 is increased by the coil spring 25 due to the increase in the fuel pressure.
When the force of pushing down the diaphragm 23 of the valve 23 becomes larger, the central portion of the diaphragm 23 is displaced upward, and the valve body 2
4 separates from the valve seat 21c and opens the upper end of the outflow pipe 21b, so that the fuel in the oil chamber R1 is discharged to the reservoir via the outflow pipe 21b and the conduit P2. As a result, the fuel pressure in the oil chamber R1 drops. Due to the opening and closing action of the upper end of the outflow pipe 21b according to the fuel pressure in the oil chamber R1, the fuel pressure in the oil chamber R1 is controlled to a constant value according to the elastic force of the coil spring 25. As a result, the fuel pressure in the conduit P1 communicating with the oil chamber R1 is maintained constant, and the fuel pressure supplied to the fuel injection valve connected to the conduit P1 is maintained constant. In the diaphragm valve as a pressure regulating valve that operates in this manner, the disc spring 33 continues to press the peripheral edge of the diaphragm 23 against the flange portion 21d of the valve box 21 with a substantially constant force. Is always fixed between the flange 21d of the valve box 21 and the U-shaped portion 33 of the controller case 22 with a substantially constant tightening force. As a result, according to the diaphragm valve according to the above-mentioned embodiment, even if the rubber constituting the diaphragm 23 ages and loses its elastic force due to long-term use, the peripheral edge portion of the diaphragm 23 and the flange portion 21d of the valve box 21 are not separated. Since the sealing function is kept high between the two and fuel does not flow from the oil chamber R1 into the pressure control chamber R2, the diaphragm 23 is prevented from coming off the valve box 21 and the control unit case 22, The durability of the diaphragm valve is improved. Modified Example Next, a modified example of the above embodiment will be described with reference to the drawings.
FIG. 4 shows a part of the diaphragm valve according to the modified example. In this diaphragm valve, the flange portion 21d of the valve box 21 is formed to be relatively thick, and the peripheral edge portion of the diaphragm 23 is mounted on the flange portion 21d via the support plate 41 formed of an annular flat plate. Also, the peripheral edge of the diaphragm 23 is caulked together with the support plate 41 by the U-shaped portion 22a of the control unit case 22. An annular groove 21d1 is formed on the upper surface of the collar portion 21d, and the groove 21d1 is formed.
A coil spring 42 (see FIG. 5) is housed inside. In this case, the coil spring 42 continues to push the diaphragm 23 upward through the support plate 41, so that the peripheral edge of the diaphragm 23 is always between the flange 21d of the valve box 21 and the U-shaped portion 22a of the control case 22. The diaphragm valve is fixed with a substantially constant tightening force, and the durability of the diaphragm valve is improved by the same operation as in the above embodiment. Further, in the above-mentioned embodiment, both the valve box 21 and the control case 22 are made of metal material. However, in the present invention, one or both of the valve box 21 and the control case 22 are made of resin. It can also be applied to a diaphragm valve, and in such a case, the effect is further exerted. That is, the resin, like the rubber, ages (or sags) as a result of long-term use, but the drawbacks such as the deterioration of the sealing property due to the aging of the resin are improved by the actions of the disc spring 33 and the coil spring 42. It

[Brief description of drawings]

FIG. 1 is a longitudinal sectional front view of the entire diaphragm valve showing an embodiment of the present invention, FIG. 2 is a perspective view of the support plate of FIG. 1, FIG. 3 is a perspective view of the disc spring of FIG. FIG. 5 is a sectional view showing a part of a diaphragm valve according to a modification of the embodiment, FIG. 5 is a perspective view of a coil spring shown in FIG. 4, and FIG. 6 is a sectional view showing a part of a conventional diaphragm valve. is there. Explanation of symbols 21 ... Valve box, 21a ... Inflow pipe, 21b ... Outflow pipe,
21c ... valve seat, 21d ... collar part, 22 ... control part case, 22a ... U-shaped part, 23 ... diaphragm, 24
...... Valve, 25,42 ...... Coil spring, 26,2
7 ... Retainer, 31 ... Bolt, 32, 41 ... Support plate, 33 ... Disc spring, R1 ... Oil chamber, R2 ... Pressure control chamber,
P1, P2 …… Conduit.

Claims (1)

[Scope of utility model registration request] 1. A disc-shaped diaphragm whose main material is rubber sandwiched between the respective ends of a valve box and a control unit case, the displacement of a valve element provided at the center of the diaphragm. In the diaphragm valve that opens and closes the fluid passage formed in the valve box according to the above, a metal spring member is interposed between the peripheral edge of the diaphragm and the end of the valve box or the control case. Characteristic diaphragm valve.