JPH0721977Y2 - Water valve freeze damage prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention mainly relates to a device for preventing freezing and destruction of a water valve incorporated in a water heater.

[Prior Art] Conventionally, for small-sized gas instantaneous water heaters mainly used in kitchens, as a freeze breakage prevention device, a water drain plug is provided, or a water stop valve is provided to prevent water from being frozen. A device that releases the pressure caused by the expansion of the air to the air reservoir is also open to the public.

[Problems to be Solved by the Invention] According to the above configuration, if the user forgets to perform the draining operation and the water heater freezes, the water valve breaks, causing water leakage. In addition, when the water tap is used, the room temperature in the kitchen is 1
When descending at a slow speed of about 1 ℃ to 2 ℃ per hour, the water inside the water shutoff part may freeze and the internal pressure may not be able to be released completely. At that time, the water valve may be broken or deformed and water may leak. Will cause. In addition, there was a problem that a high cost was incurred as a repair fee for the water valve.

In view of the above-mentioned problems, the present invention prevents freezing and destruction so that the water valve does not break even if the water heater freezes under any conditions, and the water heater can be used as usual once the freezing is solved. A device is provided.

[Means for Solving the Problems] In order to solve the above problems, the water valve freeze prevention device of the present invention is partitioned from the low pressure chamber by a diaphragm that interlocks the valve body, and one of the high pressure chambers flows water. A communication hole, which communicates the other with the atmosphere, is provided near the center of the high-pressure chamber or in a site where a large internal partial volume is provided, and a water stopcock is inserted into the communication hole through an elastic body. Is provided with a spring for pressing the water valve toward the water valve side, and a spring receiver having a hole for supporting the spring and communicating with the atmosphere. The spring overcomes the water pressure in the water valve and loses the expansion pressure due to freezing and contracts. It has the set configuration.

[Operation] With the above-described structure, the spring force pressing the water stop valve is stronger than the water pressure in the water valve during normal use of the water heater, and the water stop valve is pressed against the water valve side. ing. When the water heater freezes, the water in the water valve freezes and the volume expands. The force generated by this volume expansion overcomes the force of the spring pressing the water stopcock, and the water inside the water valve is pushed out of the communication hole until the waterstop moves to the atmosphere side and the forces balance each other. Be done. Therefore, the expansion in the water valve is reduced and the destruction can be prevented.

[Embodiment] Hereinafter, a freeze protection device for a water valve according to an embodiment of the present invention will be described with reference to the drawings. In the figure, 1 is a water inlet passage, 2 is a water governor, 3 is a differential pressure hole communicating with a water outlet passage 3a having a throttle passage, 4 is a diaphragm, 5 is a high pressure chamber communicating with the water inlet passage 1, and 6 is a differential pressure. A low pressure chamber communicating with the hole 3, 7 a hydraulic pressure responsive rod interlocking with the diaphragm 4, 8 a heat exchanger pipe, 9 a pipe holding plate, 10a communicating one side with the high pressure chamber 5 in the water valve and the other side with the atmosphere. Communication hole, 11 is a water stopper that closes the communication hole 10a, 12 is an elastic body attached to the tip of the water stopper 11, and 13 is a water stopper.
It is a spring that presses 11 toward the water valve side, and has a biasing force that overcomes water pressure. Reference numeral 14 is a spring receiver for supporting the spring 13, 10b is a hole provided in the spring receiver 14 for communicating with the atmosphere, 15 is an apparatus main body, and 16 is a lid of the apparatus main body. A communication hole 10a, a water stopcock 11, an elastic body 12, and a spring 13 which form a freeze breakage prevention device are provided in the device body 15.

The operation of the water valve freeze / fracture prevention device configured as described above will be described. During normal use, water enters from the water inlet passage 1 as shown by the arrow, the amount of water is adjusted by the water governor 2, passes through the water outlet passage 3a, and exits to the heat exchanger pipe 8.
Due to this flow of water, a pressure difference is generated between the high pressure chamber 5 and the low pressure chamber 6, this differential pressure is detected via the differential pressure hole 3, the diaphragm 4 moves to the low pressure chamber 6 side, and as a result, the hydraulic pressure responsive rod 7 is pushed, and the gas valve (not shown) attached to the end is opened. At this time, the water stopcock 11 remains pressed against the water valve side by the spring 13 via the elastic body 12 and closes the communication hole 10a, which does not affect the series of operations at all.

When the temperature drops and the water gradually freezes, the pressure in the high-pressure chamber 5 rises due to the volume expansion of the water. This pressure is spring 13
When the water stop valve 11 moves to the atmosphere side and unfrozen water is pushed out from the communication hole 10a, the pressure inside the water valve does not rise above the biasing force of the spring. Further, since the communication hole 10a communicates with a portion in the high-pressure chamber 5 in which freezing progresses slowly (a portion in the high-pressure chamber 5 where a large partial volume is provided or the central portion of the high-pressure chamber), the communication is performed at the initial stage of freezing, Hole 10
It is also possible to avoid problems such as a being frozen first and the pressure inside the water valve not being able to escape sufficiently.

As described above, according to the present embodiment, the communication hole 10a is provided, one of which is connected to the high pressure chamber 5 in the water valve and the other of which is connected to the atmosphere.
Insert the water stopcock 11 into the communication hole 10a through the elastic body 12,
By pressing the water stopper 11 against the water valve side by the spring 13, it is possible to prevent the pressure inside the water valve from rising above a certain level, so that the pipe pressing plate 9 and the lid 16 of the apparatus body are deformed by freezing. ， No water leakage. In addition, a communication hole 10a, a water stopper 11,
By providing the elastic body 12, the spring 13, and the spring receiver 14, the pressure escapes to the high pressure chamber 5 side, and as a result, the diaphragm 4 moves to the high pressure chamber 5 side, so that the water pressure responsive rod 7 is pushed by freezing and the gas valve Since it will not be opened, there is no need to worry about being fired.

[Effects of the Invention] As described above, the present invention is provided with a communication hole, one of which is connected to the high pressure chamber in the water valve and the other of which is connected to the atmosphere, and a water stopcock is inserted into this communication hole through an elastic body. By pressing this water stopper to the water valve side with a spring, even if the water valve freezes, it is possible to prevent breakage and water leakage due to freezing, and as a result, there is no need to worry about expensive repair costs.

[Brief description of drawings]

FIG. 1 is a sectional view of an apparatus for preventing freezing and breaking of a water valve according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part. 10a ... communication hole, 10b ... hole, 11 ... water stopcock, 12 ... elastic body,
13 …… Spring, 14 …… Spring receiver.

Claims (1)

[Scope of utility model registration request] Claims: 1. A diaphragm 4 for interlocking a valve element divides the low pressure chamber 6 from one side, and one side of the high pressure chamber 5 has a large partial volume in which water flows. Is provided with a communication hole 10a, a water stopper 11 is inserted into the communication hole 10a via an elastic body 12, and the spring 13 for pressing the water stopper 11 toward the water valve side and the spring 13 are supported. A spring receiver 14 having a hole 10b communicating with the atmosphere is provided, and the spring 13 is set so as to overcome the water pressure in the water valve and lose the expansion pressure due to freezing and contract. .