JPS5814297Y2 - water pressure response device - Google Patents

Description

[Detailed description of the invention] This invention relates to a water pressure response device used in water pressure automatic gas valves such as instantaneous gas water heaters, and is a type in which water volume adjustment pulp is inserted so as to be in close contact with a diaphragm that responds to water pressure and water flow. Especially in cold regions, when the flow channel near the water volume adjustment pulp freezes to the extent that it allows some water flow, when the faucet is opened, the diaphragm is activated, albeit gradually, and the water volume is accordingly reduced. The regulating valve moves forward, but
Ice is interposed between the water flow adjustment valve and the flow channel, and there are cases where it moves straight forward, and cases where it moves forward slightly and the axis is tilted.

In the former case, there is no problem, but in the latter case, the diaphragm will not return to the specified position and the gas valve will not be completely closed. Therefore, the burner flame will not be extinguished, resulting in an afterfire accident, which can cause equipment burnout and a real risk of fire. Occurs due to use.

Below, the conventional system will be explained based on FIGS. 1 and 2. A is a hydraulic response device which is divided by a diaphragm 1 into a primary chamber 2 and a secondary chamber 3. The valve body is inserted into the chamber 4, and the contact portion 6 at the tip of the valve shaft (hereinafter simply referred to as the contact portion 6) is brought into close contact with the diaphragm 1 while maintaining the same axis. There is.

Reference numeral 9 denotes a washer that is provided in the secondary chamber 3 in a state in which it is pressed into close contact with the diaphragm 1 by a return spring 10. An operating frame 8 is fitted into the end, and a return spring 13 is attached to the operating frame 8.
A gas valve 11 is integrally attached to close the gas passage 12.

In the figure, 4a is a gap in the circumferential direction between the valve body of the water volume adjustment valve 5 and the water chamber 4, 4b is a gap between the rear end surface of the valve body of the water volume adjustment valve 5 and the water chamber 4, 14 is a through hole, 15 is a water inflow channel, 16
indicates a sealing material, and L indicates a common axis of the diaphragm 1, operating rod 8, water volume adjustment pulp 5, etc.

Therefore, when the water in the next chamber 2 and the water chamber 4 is in a semi-frozen state, when water is supplied to the water flow path 15, the water flows through the ice gap and flows into the primary chamber 2, albeit in small amounts, and the diaphragm 1 When activated, the gas valve 11 is opened.

Accordingly, the water volume adjustment valve 5 is moved forward by the elastic force of the spring 7, but the contact portion 6 contacts the engagement surface of the diaphragm 1, and for example, the lower part of the circumferential gap 4a is covered with ice, and the upper part When there is almost no ice, the water volume adjustment valve 5 is rotated slightly counterclockwise to assume a forward tilted position (dashed line in Figure 2).

Conventionally, the contact surface of the contact part 6 of the water volume adjustment valve 50 is small. It is located below the axis.

Therefore, when the water supply is stopped, the diaphragm 1 is forced to retreat and return due to the elastic force of the return springs 10 and 13, and the contact portion 6
Even when pressing the diaphragm 1, the axis of the water volume adjustment pulp 5
The restoring force to return to the common axis is not generated, and the water volume adjusting pulp 5 cannot move backward in the forward tilted position 11, and the diaphragm 1 can completely return to its original position. Since the gas valve 11 is stopped in the state shown in the figure, the gas valve 11 does not close completely and an overfire accident occurs.

Such a problem may occur not only when the ice chamber freezes, but also when a foreign object is present between the valve body and the valve seat.

The purpose of this invention is to eliminate such drawbacks, and therefore, the structure of this invention is such that when the water volume adjusting pulp is tilted, an abutment part that can include a common axis such as a diaphragm is attached to the relevant part. It is installed in pulp and the outer end surface of the abutting part is formed into a smooth circular arc surface.

The embodiment will be explained below based on FIGS. 3 to 5.

In Fig. 3, a presser plate is fixed to the tip of the valve shaft of the water volume adjusting pulp 5 to form a contact part 6', and the outer diameter of the contact part 6' is the same as that of the water chamber 4.
Or the waterway on the primary chamber 2 side may freeze and the water volume adjustment valve 50
When the abutting portion 6' abuts the engagement surface of the diaphragm 1 at an angle, the abutment surface is large enough to include the common axis of the diaphragm 1, etc., and the outer end surface of the abutment surface is smooth. It is molded into a circular arc surface.

Other parts that are the same as in FIG. 1 are designated by the same reference numerals.

By doing so, it is possible to prevent the conventional residual fire accident.

That is, when water is supplied to the water inflow path 15, the diaphragm 1 is moved forward as described above, and accordingly, even if the water volume adjusting pulp 5 is tilted forward, for example, its contact portion 6'
Since the outer diameter of the diaphragm 1 is large, the upper end portion of the contact surface is located above the common axis of the diaphragm 1 and the like.

If the water supply is then cut off, the diaphragm 1 is retracted and presses the upper end of the contact portion 6' of the water volume adjustment valve 50 in the axial direction, and the water volume adjustment pulp 5 has a restoring force that rotates clockwise. As a result, the forward tilted posture is corrected and the body is returned to its original position.

Furthermore, since the outer end surface of the abutting portion 6' has a smooth arcuate shape, the return of the water amount adjusting pulp 50 to its original position is performed smoothly.

Figure 5 shows an example in which the diameter of the presser plate is further increased and the abutting surface of the abutting part 6' is extended to the bent part of the diaphragm. increases, and the restoration operation becomes even better.

The conditions under which the water volume adjusting pulp 5 in the inclined state can be restored are the outer diameters of the abutting portions 6' and 6'', specifically, the abutting portion 6'.
, 6'' is required to have a maximum outer diameter of the end face of a predetermined size or more, and this value is usually determined by the circumferential gap 4a between the valve body of the water volume adjustment valve 5 and the water chamber 4.

It is clear that this is determined by the axial clearance 4b and the like.

As explained above, in this device, no matter how inclining the water volume regulating pulp is, the contact surface of the water volume regulating pulp with the diaphragm has an outer diameter dimension large enough to encompass the common axis of the diaphragm, etc. The extremely simple structure of the shape makes it easy to assemble the device, and it not only ensures safety by preventing residual fire accidents during freezing conditions, but also has the effect of stabilizing the movement of the water volume adjustment pulp.

[Brief explanation of the drawing]

Figures 1 and 2 are a longitudinal side view showing a conventional device and an enlarged sectional view illustrating the state of contact between the diaphragm and the water volume regulating pulp, and Figure 3 is a longitudinal side view showing an embodiment of this invention. 4 is an enlarged sectional view illustrating the state of contact between the diaphragm and the water volume adjusting pulp of this invention, and FIG. 5 is a longitudinal sectional side view of the main part showing another embodiment. A...Hydraulic response device body, 1...Diaphragm, 2...-Next chamber, 3...Secondary chamber, 4... Water chamber, 5... Water volume adjustment pulp, 6, 6', 6"... Contact part, 11...
...Gas valve, L...Common axis line.

Claims (1)

[Scope of utility model registration request] A diaphragm separates the primary and secondary chambers, and the tip of the valve shaft of the water adjustment valve installed on the next chamber side contacts the washer of the diaphragm, and changes in water pressure acting on the next chamber side cause the secondary chamber side to The gas pulp is opened and closed through an operating rod provided in the valve, and the pulp is provided with an abutment portion capable of encompassing a common axis such as a diaphragm when the water volume adjustment valve is tilted, and A hydraulic response device in which the outer end surface of the contact part is formed into a smooth circular arc surface.