JPH0119003Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a water drain device for a water heater.

[Conventional technology]

In general water heaters and water heaters, the outer surface area of the water passage is large and the internal capacity is small, so when the water passage is not in use, such as at night in winter, the water in the passage cools and freezes, causing damage to the appliance.

The conventional technology will be explained based on FIGS. 5 and 6. 1 is a water heater, water enters from a water supply inlet 2, passes through a water governor 3, enters a heat exchanger 4, is heated by a burner 5, and becomes hot water. Hot water is supplied from the outlet 6 to each hot water tap 7. 8 is a water supply thermal valve installed at the highest point on the water supply inlet side upstream of the heat exchanger 4;
As shown in the figure, the water stop valve 10 of the thermal valve 8 for normal water supply
used with it open. Reference numeral 27 denotes a drain valve, and the drain valve 27 is closed by water supply pressure when the water heater 1 is in use, and is opened to drain water when no water pressure is applied. 1
0 is a water stop valve provided in the water supply thermal valve 8, and by moving downward, it blocks the water passage to the downstream side and stops the water supply. An air inflow path 13 communicating with outside air is provided inside the water stop valve 10, and the air valve 11 is normally closed. 14 is a thermoelement for driving the water stop valve 10 and the air valve 11; when the inside is heated by the heater 15, the enclosed fluid expands and the piston moves downward; 11 is activated. A spring 17 normally biases the air valve in the closing direction, and is set to have a higher load than the spring 18 that biases the water stop valve 10 in the opening direction. A remote controller 25 for remotely controlling the water stop valve is connected to the tip of the heater power cord of the thermoelement 14 .

Next, to drain the water in the water heater 1 and prevent it from freezing, turn on the remote controller 25 to energize the heater 15. The thermoelement 14 is heated, the piston moves downward, and the spring 18
The water stop valve 10 comes into contact with the valve seat 8a and blocks the water passage. When the piston moves further, the spring 17 is deflected and the air valve 11 is opened, and the downstream side of the water stop valve 10 is communicated with the atmosphere, and the water pressure in the water passage disappears, and the drain valve 27 is opened and the water inside the vessel is drained. Then, the heater 15 of the thermoelement 14 is energized, the drain valve 27 is opened, and the water in the water passage is drained until the next use.

When the remote controller 25 is turned OFF to stop energizing the heater 15, the fluid in the thermoelement 14 contracts, causing the piston to be pushed up by the springs 17 and 18, closing the air valve 11, and further opening the water stop valve 10 to stop water. The passage is filled with water and the water pressure closes the drain valve 27.

[Problem that the invention attempts to solve]

However, in the above configuration, the air valve 11 provided inside the water supply thermal valve 8 closes the water supply thermal valve 8.
Since it takes some time for the drain valve 27 to open after the drain valve 27 is closed, there is a drawback that water in the pipe, which has been compressed by water pressure, is discharged from the air valve 11 during that time. Further, when the water pressure becomes low due to fluctuations in water pressure while the water heater 1 is in use, the spring of the drain valve 27 automatically expands, causing a small amount of water to leak from the drain valve 27.

The present invention was developed in view of the above-mentioned drawbacks, and is a water heater water drain structure that prevents water discharge from an air valve and water leakage from a drain valve due to a drop in water pressure, and operates reliably and quickly. The purpose is to provide the following.

[Means for Solving the Problems] The structure of the present invention for achieving the above object will be explained based on FIGS. 1 to 4 corresponding to the embodiments. In the water heater 1, the heat exchanger 4 is connected to the water inlet 2 and the hot water outlet 6 through piping to form an inflow channel and an outflow channel. A water supply thermal valve 8 provided with a water stop valve 10 and a drainage thermal valve 9 provided with a drain valve 20 at the lowest position of the outflow waterway are provided, and a remote controller 25 is provided.
The controller 26 is actuated, and the signal causes the water stop valve 10 to close and then the air valve 11 to open, and in synchronization with this, the drain valve 20 of the drain thermal valve 9 is opened, and the air valve 11 is closed. A technical measure is taken in which the water stop valve 10 of the water supply thermal valve 8 is opened after the drain valve 20 is closed almost in synchronization with the above.

[Effect]

According to the present invention, by using the above-mentioned means, the draining operation of the appliance is performed by operating the remote controller 25, and the signal is transmitted to the controller 26, and the thermo-element of each of the water supply thermal valve 8 and the drainage thermal valve 9 is activated. The heaters 15 and 23 are energized at the same time. In the water supply thermal valve 8, when the thermoelement heater 15 is energized, the thermoelement 14 is heated and the rod 16 moves downward, and the spring 18 is first bent, causing the water stop valve 10 to come into contact with the valve seat 8a and close the water passage. cut off. When the rod 16 is further moved, the spring 17 is then deflected, the air valve 11 is moved, the air port 12 is opened, and the air is discharged downstream through the air inlet passage 13.

When the thermo-element heater 23 is energized in the drain thermal valve 9, the thermo-element 22 is heated, the rod 24 moves to the left, the drain valve 20 moves accordingly, and the drain port 21 opens. By nearly synchronizing the movement of the drain valve 20 in the thermally operated valve 9 for draining and the movement of the air valve in the thermally operated water supply valve 8 as shown in FIG. 4, the water passage is blocked and the air port 12 is opened. Since the drain port 21 opens almost synchronously, the water inside the vessel is drained. When the power supply to the thermoelement heaters 15, 23 is stopped, the fluid in the thermoelements 14, 22 contracts, so the springs 17, 18 push up the rod in the water supply thermal valve 8, and the air port 12 closes. The water stop valve 10 opens and the water passage is filled with water. At this time, the rod moves to the right within the drainage thermal valve 9, and the drain port 21 is closed.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

Reference numeral 1 denotes a water heater, in which water enters from a water supply inlet 2, passes through a water governor 3, enters a heat exchanger 4, is heated by a burner 5, and is supplied from a hot water outlet 6 to each hot water tap 7. 8 is a water supply thermal valve installed on the water supply inlet side, located at the highest position of the water passage of the vessel, and has the functions of both a water stop valve and an air valve, and is normally used when the water stop valve is open. Ru. Reference numeral 9 denotes a thermal valve for draining water, which is located at the lowest position of the water passage of the vessel body, and is used with the drain valve closed when in use. As shown in FIG. 2, there is a water stop valve 10 inside the water supply thermal valve 8, and when this valve element moves downward, it cuts off the water passage to the downstream side and stops the water supply. Also, air valve 1
1, and when this valve body moves downward, it opens the air port 12 and charges air downstream through an air inflow path 13 provided inside the valve body. Normally, the air valve 11 is closed. 14 is water stop valve 1
This is a thermoelement for driving the rod 1 and the air valve 11. When heated by the thermoelement heater 15, the enclosed fluid expands and the rod 1 is heated.
6 downward, and the water stop valve 10 and air valve 11 are activated.

Between the water stop valve 10 and the air valve 11, there is a spring 17 that normally biases the air valve in the closing direction and a spring 18 that biases the water shutoff valve 10 in the opening direction. The load is set to high. Further, a spring 19 is provided so that the water stop valve 10 and the air valve 11 do not move when the thermoelement is not heated. Further, as shown in FIG. 3, there is a drain valve 20 inside the thermal valve 9 for draining, and when this valve moves to the left side, a drain port 21 is opened. 22 is a thermoelement for driving the drain valve 20, and when heated by a thermoelement heater 23, the enclosed fluid expands, moving the rod 24 to the left and operating the drain valve.

[Effect of idea]

Therefore, the present invention provides a thermal valve for water supply with an air valve and a water stop valve provided at the highest position of the inflow waterway, a thermal valve for water drainage that has a drain valve provided at the lowest position of the outflow waterway, and a remote controller. The controller is actuated, and the signal closes the water shutoff valve, and then the drain valve of the thermal valve for draining is opened in synchronization with the air valve being opened.Also, the drain valve of the thermal valve for draining is opened almost in synchronization with the air valve closing. Since the water stop valve of the water supply thermal valve is opened after the valve is closed, water discharge from the air valve and water leakage from the drain valve due to a drop in water pressure are eliminated, and water can be drained quickly and reliably. This has the effect of improving usability.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing an embodiment of the present invention, Fig. 2 is a sectional view showing the water supply thermal valve of the invention, Fig. 3 is a sectional view showing the drainage thermal valve of the invention, and Fig. 4 is a sectional view showing the water supply thermal valve of the invention. 5 is a system diagram showing a conventional embodiment, and FIG. 6 is a sectional view showing a thermal valve for water supply. Explanation of symbols, 1...Water heater, 2...Water supply inlet,
3...Water governor, 4...Heat exchanger, 5...Burner, 6...Hot water outlet, 7...Hot water tap, 8...Thermal valve for water supply, 8a...Valve seat, 9...For drainage Thermal valve, 1
0... Water stop valve, 11... Air valve, 12... Air port, 13... Air inflow path, 14... Thermoelement, 15... Heater for thermoelement, 16
... Rod, 17 ... Spring, 18 ... Spring, 19
... Spring, 20 ... Drain valve, 21 ... Drain port, 2
2... Thermoelement, 23... Heater for thermoelement, 24... Rod, 25... Remote controller, 26... Controller, 27... Drain valve.

Claims (1)

[Scope of utility model registration request] A water heater that includes a burner, a heat exchanger, etc. inside, and connects the heat exchanger to a water inlet and a hot water outlet through piping to form an inflow channel and an outflow channel,
A thermal valve for water supply with an air valve and a water stop valve installed at the highest position of the inflow waterway, and a thermal valve for drainage with a drain valve installed at the lowest position of the outflow waterway, and a controller is operated by a remote controller. The water stop valve of the thermal valve for water supply is closed by the signal, and the air valve is opened, and the drain valve of the thermal valve for drainage is opened in synchronization with the air valve.Also, almost in synchronization with the closing of the air valve, the water is drained. A water drain device for a water heater, characterized in that a water stop valve of a thermal valve for water supply is opened after the valve is closed.