JPH03286961A - Valve structure with abnormal state sensor for hot water feeder - Google Patents

Abstract

PURPOSE:To stop an operation of a hot water feeder under an abnormal state and terminate a heating in a boiler by a method wherein a valve such as a pressure safety valve or the like fixed to a water feeding passage has a solenoid valve therein and a safety switch cooperated when an abnormal pressure or an abnormal temperature is detected is installed integral with the pressure safety valve. CONSTITUTION:A valve for performing a safe operation to be fixed in a pipe spaced apart from a boiler for a hot water feeder is provided with a trouble preventive means, wherein a valve C such as a pressure safety valve fixed in a water feeding passage B reaching to the hot water feeder A has a solenoid valve 1 therein. The valve C is provided with a safety switch 2 cooperated when an abnormal pressure or an abnormal temperature is installed integrally with the valve C. The solenoid valve 1 is closed when the safety switch 2 is operated and then an operation of the hot water feeder A is stopped. The solenoid valve 1 is installed in the valve C in advance, and when the safety switch 2 is operated, the operation of the hot water feeder A is stopped and a water feeding toward the hot water feeder A is stopped by the solenoid valve 1, so that an operator notices immediately an abnormal state of the hot water feeder A and the water leakage is prevented also when the hot water feeder A is broken.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure reducing valve, a pressure safety valve, etc. for a water heater that uses gas, oil, etc. as a heat source and is used by being directly connected to a water supply.

[Conventional technology]

Tap water is generally supplied to water heaters at a pressure of about 3 to 7 W, ycrpp, so the set pressure is 0.6 to 0.
It is equipped with valves for safe operation, such as a pressure reducing valve of 8kgf15r'', a check valve to prevent the hot water in the heat exchanger from flowing back into the tap water, and a pressure safety valve to release pressure.

In addition, in order to ensure the safety of the water heater, the operation of the water heater should be stopped when abnormal vibrations such as earthquakes are detected, abnormally high temperature of the water heater is detected, abnormal combustion of the burner of the water heater is detected, etc. Equipped with a safety device to stop.

[Problem to be solved by the invention]

A water heater is operated by boiling water to a temperature set by the operator, and if the circuit that sets the water temperature breaks down, the water temperature will rise abnormally, and this temperature rise will occur. An overheating prevention sensor detects this and stops the water heater.

By the way, if the hot water temperature setting circuit is malfunctioning and the backup overheating prevention sensor is also malfunctioning,
Both sensors are temperature sensors and have the same heating and
This phenomenon is not inevitable since it is attached to a water heater body that is repeatedly cooled, but it is a phenomenon that can occur. When this happens, the water heater will run continuously and boiling water will come out of the faucet, the internal pressure of the can will rise and the pressure safety valve will operate, spewing out hot water mixed with steam, and in the worst case, the can will deform.・It may cause an accident of rupture.

[Means to solve problems]

In order to solve this problem, the present invention focuses on a valve that performs safe operation and is installed in a piping path away from the can body of a water heater, and a trouble prevention means is configured in the vent valve.
A solenoid valve 1 is installed in a valve C such as a pressure safety valve installed in the water supply passage B leading to the water supply passage B, and a safety switch 2 is provided integrally with the valve C to respond when abnormal pressure or temperature is detected, and when the safety switch 2 is activated The solenoid valve 1 is closed, and the operation of the water heater A is stopped.

In addition, when using a pressure safety valve as the valve C that performs safe operation, the bellows 4 is installed on the discharge side of the pressure safety valve C to release abnormal pressure, rather than directly detecting the pressure and temperature of the water supply (hot water) communicating with the piping. A safety switch is constructed of a pressure switch 3 and a temperature-sensitive switch operated by a bimetal 5.

[Effect]

When the pressure of tap water is reduced and the water supply is stopped, the check valve works to prevent backflow from water heater A to the water pipes through water supply passage B, and high-pressure tap water is directly supplied to the can of water heater A. The pressure reducing valve works to lower the supply pressure of tap water so that water does not get overloaded, and the pressure safety valve works to release the abnormal pressure when it occurs in the water heater A. In addition, there is a temperature control circuit that detects the water temperature of water heater A and boils the water to the desired temperature.If the water temperature of water heater A rises abnormally due to an abnormality in the temperature control circuit, the abnormally high temperature will stop water heater A. They are equipped with prevention devices, and these functions usually ensure stable combustion and hot water supply.

If both the temperature control circuit and the abnormal high temperature prevention device fail, water heater A cannot be stopped even if water heater A reaches the same temperature as water heater A, and the can body enters the nIl state. In this state, the internal pressure of the can body and water supply passage B becomes high, and if a pressure safety valve is installed in water supply passage B, the pressure safety valve will operate safely, open the valve, and the high temperature and high pressure heat will blow out. It is something.

This invention attaches a solenoid valve 1 and a safety switch 2 to a valve C that performs various safety operations, detects an abnormality in the pressure or temperature of a water supply passage B communicating with a water heater A, and when the abnormality occurs, the water heater A
When the heating of the can body is stopped, the solenoid valve 1 is closed and the water supply is opened. B. Water heater A. Water supply to the hot water faucet is stopped.

〔Example〕

The configuration will be described below with reference to figures showing an embodiment. A is the main body of the water heater, B is a water supply passage for connecting and supplying tap water to the water heater A, and C is a valve that is attached to the water supply passage B and performs various safety operations. and f) Valve C in the embodiment includes a back pressure valve 6 and a pressure reducing valve 7.
The pressure relief valve 8 and the pressure safety valve 8 are integrated into a pressure reducing check valve, but each may be a single-function valve. D is a burner that heats the can in water heater A, E is a hot water pipe that connects to the can in water heater A, F is attached to the end of hot water pipe E (it is a faucet, and l is the valve C) A solenoid valve 2 is attached to the drain valve C to open and close the water supply passage B, and a safety switch 2 is attached to the vent valve C to detect abnormalities in water temperature and pressure in the water supply passage B.The valve C to which the safety switch 2 is attached is a When the safety valve 8 is used, rather than installing the safety switch 2 in a position where the temperature and pressure are detected by contacting the water that is constantly connected to the water supply passage B, the safety switch 2 is installed only in the event of an abnormality on the discharge side of the pressure safety valve 8 as shown in the example. It is best to install the safety switch 2 in the water supply passage B at the position where water flows.In this case, the safety switch 2 will be independent of fluctuations in the temperature and pressure of the water supply that occur during use, and the function of the safety switch 2 will be less likely to deteriorate. , and since the pressure safety valve 8 determines whether there is an abnormality, the safety switch 2 has a rough structure that detects water flow to the discharge side and is sufficiently practical. 3 is a bellows that deforms under pressure, and 5 is a bellows 3. The bellows 3 and the switch 5 constitute a safety switch 2. In the embodiment shown in FIG. 2, 4 is a disc-shaped bimetal; At a constant temperature, the bimetal 4 is reversed and switches the contacts of the switch 5.

The pressure increase in the can body of the water heater A occurs when the burner D is in continuous operation and continues heating. It is connected to detect a rise in pressure in the can body and stop the operation of water heater A. If water heater A stops operating, heating will not be performed, so the pressure in the can body will be released from pressure safety valve 8 and faucet F. This will return the pressure to the appropriate level.

Also, if the pressure safety valve 8 is installed in the water supply passage B,
When the pressure of the water heater A is released from the pressure safety valve 8, high-temperature water flows backward through the water supply passage B and flows to the pressure safety valve 8, so even if the water temperature in the water supply passage B rises, the pressure increase due to the heating of the water heater A can be detected. be.

On the other hand, even when water heater A starts operating when hot water is not being used and becomes in an abnormal state, the operation is stopped and the abnormal state is automatically dealt with. However, there are times when the operator does not notice that this trouble has occurred, and when he opens faucet F to use hot water, he does not notice the problem until after the hot water stored in water heater A is used up. In rare cases, water heater A or water supply passage B may be damaged due to the pressure during abnormal operation of water heater A, causing water leakage. This invention has a valve C in advance.
A solenoid valve 1 is installed in the water heater A when the safety switch 2 is activated.
In addition to stopping the operation of water heater A, the operator also stops the water supply to water heater A using solenoid valve 1. This is to immediately notice any abnormalities in water heater A, and to prevent water leakage even if water heater A or the like is damaged.

〔effect〕

As described above, this invention provides water supply passage B when water heater A is used.
Focusing on valve C of various safety functions installed in water heater A,
This was in response to an abnormality in water heater A at a different location than the previous one, and both the hot water temperature control circuit and abnormal high temperature prevention device of water heater A were malfunctioning, or the burner D itself was malfunctioning, resulting in steam leaking from the pressure safety valve. This prevents the dangerous situation of continuously discharging high-temperature water.

In addition, the safety switch 2 not only stops the operation of the water heater A, but also closes the solenoid valve 1 to stop the water supply to the water heater A, so that the operator can immediately know if there is an abnormality in the water heater A. Became.

In addition, because the solenoid valve L and safety switch 2 are assembled in advance into the valve C, they can be manufactured at a lower cost than dedicated parts.
The piping path for water heater A can be installed as usual, and manufacturing and
The structure is convenient for both installation and installation.

[Brief explanation of drawings]

FIGS. 1 and 2 are cut-away diagrams showing an embodiment of the invention, and FIG. 3 is a piping diagram showing the installed state. A...Water heater B...Water supply passage C.
...Valve 1...11J12...Safety switch 3...Bellows 4...
Bimetal +1 Routo 2 Juto 1 cut

Claims (3)

[Claims] (1) A solenoid valve 1 is installed in a valve C such as a pressure safety valve installed in a water supply passage B leading to a water heater A, and a safety switch 2 is provided integrally with the valve C to respond when abnormal pressure or temperature is detected.
A valve structure with an abnormality detector for a water heater that closes a solenoid valve 1 when the safety switch 2 is activated and stops the operation of the water heater A. (2) The valve structure with an abnormality detector for a water heater according to claim 1, wherein the safety switch (2) is constituted by a pressure switch having a bellows (3) attached to the discharge side of a pressure safety valve (C) for releasing abnormal pressure of the water heater (A). (3) The valve structure with an abnormality detector for a water heater according to claim 1, wherein the safety switch (2) is constituted by a temperature-sensitive switch operated by a bimetal (4) attached to the discharge side of a pressure safety valve (C) for releasing abnormal pressure of the water heater (A).