JPS6143077Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to preventing malfunctions due to freezing of a hydraulic response device used in an instantaneous water heater.

With conventional water pressure response devices installed in gas water heaters, when the rod freezes during extremely cold periods, the volumetric expansion of the water when it freezes causes the rod to pop out, activating the gas valve or switch installed at its tip. Extremely dangerous.

The present invention is intended to eliminate such difficulties, and will be explained in detail below with reference to figures. 1 is a high-pressure side main body having a valve chamber 2 and a diaphragm attachment part 3 in the center, and 4 is a low-pressure side rod 6 whose tip is connected to a gas valve or a switch for opening and closing a gas solenoid valve on a protrusion 5 in the center. A diaphragm mounting flange 8 is formed through the rod 6 so as to be slidable therethrough, and a small chamber 7 is formed from which one end of the rod 6 faces.
It is a low pressure side main body having a. 9 is a diaphragm operated by the differential pressure between the high pressure side and the low pressure side;
A valve rod 12 for adjusting the amount of water passes through the center of the left side with the main pressure receiver 10 and the right side with the auxiliary pressure receiver 11.
is fixed by a nut 13, and the periphery is held down by the diaphragm mounting portion 3 and the diaphragm mounting flange 8. 14 is small room 7
A partition plate 16 separates the low pressure room 15 from the small room 7.
A communication hole 17 that communicates between the valve stem 12 and the low pressure chamber 15 is a plate disposed between the valve stem 12 and the rod 6 within the small chamber 7 to prevent malfunction and slide freely within the small chamber 7.

The present invention has such a structure, and freezing usually begins in areas where the amount of water is small relative to the surface area. The small room 7 was formed for this purpose, and freezing starts from this room first, and the malfunction prevention plate 1
7 is trapped by ice on both sides, the high-pressure side valve chamber 2 freezes and expands after a delay, displacing the diaphragm 9, and even if the left end of the valve stem 12 pushes the plate 17, the inside of the small chamber 7 The plate 17 does not move at all, only compressing the ice. Therefore, the low-pressure side rod 6 also does not move, and there is no possibility of malfunction. Furthermore, even if the ice melts from the small chamber 7 first, it will not operate unless the valve chamber 2 and the low pressure chamber 15 are thawed.

In this way, the present invention has a small chamber formed in the center of the low pressure side, and the movement of the valve stem is transmitted to the low pressure side rod through a plate that slides freely inside the chamber to prevent malfunction. Therefore, the low-pressure side rod is prevented from popping out during freezing, eliminating malfunctions of gas valves, switches, etc., and improving safety.

[Brief explanation of the drawing]

The drawing is an overall sectional view showing an embodiment of the present invention. 4...Low pressure side main body, 6...Low pressure side rod, 7...
...Small room, 9...Diaphragm, 12...Valve stem,
17...board.

Claims (1)

[Scope of utility model registration request] A small chamber is formed in the center of the low-pressure side to accommodate a small amount of water, and a plate that freely slides inside this chamber allows the movement of the valve stem that interacts with the diaphragm to be controlled by a slide whose tip is connected to a gas valve or switch. A water pressure response device characterized by transmitting information to a freely movable low pressure side rod.