JPH0224039Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an antifreeze device that is incorporated into a stop-start type gas water heater.

[Conventional technology]

One way to prevent freezing in a gas water heater is to keep a small amount of water flowing, and a low-temperature valve is an automated version of this function.

This low-temperature operating valve consists of a thermoelement that converts a volume change due to a temperature change in wax into mechanical movement of a shaft, and a valve mechanism that opens and closes according to the movement of the shaft of the thermoelement.
When the outside temperature drops and the water temperature falls below the valve opening set temperature, the wax inside the thermoelement contracts, and the shaft moves as the wax contracts, opening the valve mechanism, and after the valve opens, the outside temperature rises. When the water temperature rises above the valve opening set temperature, the wax within the thermoelement rapidly expands, and the shaft moves due to this expansion, thereby closing the valve mechanism.

To automatically prevent freezing of a gas water heater using this low-temperature-operated valve, install the low-temperature-operated valve at any position in the piping system of the gas water heater, and when the low-temperature-operated valve opens, the gas water heater A portion of the water supplied to the boiler is discharged to the outside via a low temperature operating valve. By doing this, when the outside temperature drops and the temperature of the water supplied to the gas water heater drops and becomes below the opening temperature of the low-temperature valve, the low-temperature valve will automatically open as described above. Therefore, regardless of whether the valve installed in the gas water heater is opened or closed, a small amount of water is discharged to the outside through the low-temperature operating valve, and a small amount of water always flows through the piping system of the gas water heater. Freezing can be prevented.

[The problem that the idea aims to solve]

FIG. 5 is a schematic diagram of the above-described low-temperature operating valve 1 incorporated into a stop-start type gas water heater 2. This stop-start type gas water heater 2 has a heat exchanger 3 as shown in the figure.
A valve 4 that controls the supply of water to the burner 5 is installed upstream of a diaphragm 6 that controls the supply of gas to the burner 5. Note that the diaphragm 6 is operated by water pressure. Therefore, a low-temperature operating valve 1 is incorporated into this main stop type gas water heater 2, and when the water temperature decreases as the outside temperature decreases, the valve 4
In order to allow a small amount of water to flow regardless of whether the valve is opened or closed, it is necessary to install the low-temperature operating valve 1 immediately before the valve 4. However, if the low temperature operation valve 1 is installed just before the upstream side of the valve 4, when the water heater is not in use, that is, when the valve 4
When the valve is closed, the water pressure decreases, and the low-temperature operation valve 1
When the valve 4 is opened, water flows little by little in the piping system located upstream of the valve 4, which prevents freezing. The water in the piping system remains stationary because only the outlet is open. Therefore, even though the low-temperature operation valve 1 operates accurately as the water temperature drops, the water remaining in the water chamber 6a of the diaphragm 6, the heat exchanger 3, and the piping system connecting them freezes. There was a problem that damaged the functionality of the equipment and even destroyed the water heater.

[Means to solve the problem]

This anti-freezing device is installed in a gas water heater with a main stop valve, and has a branch passage for water supply immediately before the upstream side of the main stop valve, and operates at a low temperature that opens when the outside temperature falls below the valve opening setting temperature. a water drain valve that opens when the stop valve opens and water pressure is applied to a diaphragm that is linked to the gas valve; This is a device that prevents freezing by comprising an interlocking valve and an interlocking valve.

[Effect]

Opening of low-temperature operating valve When the outside temperature falls below the set temperature, the low-temperature operating valve opens, so a small amount of water is constantly discharged from the piping upstream of the stop valve, which not only prevents freezing, but also when the operating valve opens. At the same time as the interlocking valve opens, the water drain valve opens when the water heater is not in use, so the water in the water heater is discharged through the water drain valve and the interlocking valve, eliminating any frozen water in this area.

〔Example〕

1 to 4 are cross-sectional views showing the state in which the antifreeze device according to the present invention is incorporated into a main stop type gas water heater 10, and 11 in the figure shows the main stop type gas water heater 10. The water supply hole 12 is a water supply pipe whose tip is inserted into the water supply hole 11. 13 is water supply pipe 12
A stop valve 14 is actuated by the pressure of the water sent through the stop valve 13 to control the supply of water sent through the water supply hole 11 from the main stop valve 13 to the heat exchanger (not shown). , a diaphragm that controls the gas supply to a burner (not shown) that heats the heat exchanger. 15 is a branch passage branching from the water supply hole 11; 16 is a low-temperature operating valve that communicates with the branch passage 15; one end of the low-temperature operating valve 16 communicates with the branch passage 15 and the other end has a valve seat 17a; It consists of a valve body 18 which has a hole 17 at its upper end and is open at its lower end, and a thermoelement 20 which is elastically supported within the valve body 18 via a spring 19. Similar to the conventional thermoelement 20, this thermoelement 20 converts the volume change due to the temperature of the wax stored in the thermoelement 20 into mechanical movement of the shaft 20a.
A valve body 21 is fixed to the tip of the valve body 18, which presses against the valve seat 17a of the valve body 18. When the temperature around the thermo-element 20 is higher than the valve-opening set temperature, the shaft 20a slides upward in the figure due to the expansion of the wax, and the valve body 21 fixed to the tip of the shaft 20a hits the valve seat 17a of the valve body 18. Because of the pressure contact, the branch passage 15 communicating with the communication hole 17 is closed. Furthermore, when the temperature around the thermoelement 20 falls below the valve opening set temperature, the volume of the wax contracts, the shaft 20a slides downward in the figure, the valve body 21 fixed to the shaft 20a separates from the valve seat 17a, and the branch opens. The passage 15 is open. 22
23 is a first communication hole for communicating between the water chamber 14a of the diaphragm 14 and a heat exchanger (not shown), and 23 is a second communication hole 2 between the water chamber 14a of the diaphragm 14 and a heat exchanger (not shown).
4, the drain plugs 25 and 26 communicate with each other through the second
These are a drain valve and an interlocking valve interposed between the communication hole 24 and the drain plug 23. This drain valve 25
In this case, the main stop valve 13 is closed and the diaphragm 14 is closed.
When no water pressure is applied to the water chamber 14a of the diaphragm 14, it opens by the elastic force of the spring 25a, and the stop valve 13 opens, and the water chamber 14 of the diaphragm 14 opens.
When water pressure is applied to a, the valve is closed by this water pressure. Further, the interlocking valve 26 is formed of an elastic body and is operated by water pressure applied to the branch passage 15, and is in a closed state when the low temperature operation valve 16 is closed and the pressure in the branch passage 15 is high. Also, when the low temperature operation valve 16 opens and the pressure in the branch passage 15 decreases, the spring 26
The valve is opened by the elastic force of a. That is, it opens and closes in synchronization with the opening and closing of the low temperature operating valve 16. Note that this interlocking valve 26 is connected to the drain valve 2.
An orifice 27 is provided in the branch passage 15 in order to open and close the branch passage 15 only by pressure changes regardless of whether the valve 5 is opened or closed. In addition to reducing the water pressure applied to the valve 26, the amount of water discharged from the low temperature operating valve 16 is regulated.

Next, the operation of the antifreeze device having the above configuration will be explained.

First, when the gas water heater 10 is not in use, that is, when the stop valve 13 is closed, no water pressure is acting on the water chamber 14a of the diaphragm 14, so the water drain valve 25 is closed regardless of the outside temperature. It is in an open state due to the elastic force of the spring 25a. In this state, when the outside temperature is equal to or higher than the opening temperature of the low-temperature operating valve 16, the low-temperature operating valve 16 is in a closed state, and the interlocking valve 26, which is synchronized with the opening and closing of the low-temperature operating valve 16, is also in a closed state. It is in. Therefore, water is not discharged to the outside from the branch passage 15 and the drain plug 23 (the state shown in FIG. 1). When the outside temperature falls below the opening temperature of the low-temperature operating valve 16 in the above-mentioned state, the low-temperature operating valve 16 opens and the interlocking valve 26 synchronized with the low-temperature operating valve 16 also opens. Therefore, a part of the water supplied from the water supply pipe 12 to the water supply hole 11 is
It is discharged to the outside through the branch passage 17 to prevent the water supply pipe 12 from freezing. Furthermore, by opening the interlocking valve 26, the water remaining in the diaphragm 14 and the heat exchanger (not shown) is also removed from the second communication hole 24,
The gas water heater 10 is discharged to the outside through the water drain valve 25, interlocking valve 26, and water drain valve 23 (air enters from the outlet (not shown) and is replaced, so all water is discharged). There is no residual water left inside and it does not freeze (as shown in Figure 2).

Next, when the gas water heater 10 is used, that is, when the stop valve 13 is open, water pressure is applied to the water chamber 14a of the diaphragm 14, so the drain valve 25 is closed regardless of the outside temperature. be. In this state, when the outside temperature is higher than the opening set temperature of the low-temperature operating valve 16, the low-temperature operating valve 16 is in a closed state, and the interlocking valve 26, which is synchronized with the opening and closing of the low-temperature operating valve 16, is also in a closed state. be. Therefore, branch passage 15
Water is not discharged to the outside from the water drain valve 23, and all water supplied from the water supply pipe 12 to the gas water heater 10 through the water supply hole 11 is sent to the heat exchanger (as shown in Fig. 3). situation). Further, when the gas water heater 10 is used, when the outside temperature falls below the opening temperature setting of the low temperature operation valve 16, the interlocking valve 26 synchronized with the low temperature operation valve 16 opens at the same time as the low temperature operation valve 16 opens.
Also opens. However, at this time, since the drain valve 25 is in a closed state, a portion of the water supplied from the water supply pipe 12 to the water supply hole 11 passes from the branch passage 15 through the interlocking hole 17 of the low temperature operation valve 16 to the outside. However, it is not discharged to the outside from the drain valve 23. Therefore, all the water after passing through the stop valve 13 is sent to the heat exchanger, thereby preventing the amount of water supplied to the heat exchanger from decreasing (the state shown in FIG. 4).

[Effect of idea]

As mentioned above, the antifreeze device according to the present invention is
When the main stop valve that controls the water supply to the heat exchanger of a main stop gas water heater is closed and the outside temperature drops and the antifreeze device is activated, the water upstream of the main stop valve At the same time, the water remaining in the water chamber of the diaphragm located before the stop valve, the heat exchanger, and the piping system that connects them is stopped at the source. Since it is a water heater, the tap is always open, so
It can be easily drained to the outside from the opening on the lower side, which prevents water from remaining in the gas water heater when the anti-freezing device is activated and causing this water to freeze.

[Brief explanation of the drawing]

1 to 4 are cross-sectional views showing the operating state of the antifreeze device according to the present invention, and FIG. 5 is a schematic diagram showing the position where the conventional antifreeze device is installed in a stop-start type water heater. . 10... Main stop type gas water heater, 13... Main stop valve, 14... Diaphragm, 14a... Water chamber, 15... Branch passage, 16... Low temperature operation valve, 2
3...Drain tap, 25...Drain valve, 26...Interlocking valve.

Claims (1)

[Scope of utility model registration request] This anti-freezing device is installed in a gas water heater with a main stop valve, and has a branch passage for water supply immediately before the upstream side of the main stop valve, and operates at a low temperature that opens when the outside temperature falls below the valve opening setting temperature. a water drain valve that opens when the stop valve opens and water pressure is applied to a diaphragm that is linked to the gas valve; 1. A freezing prevention device for a gas water heater, characterized in that it is configured by an interlocking valve that operates in conjunction with a .