JPH0218437Y2 - - Google Patents

Description

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

(Prior art) General water heaters and water heaters have a large outer surface area and a small internal capacity of water passages, so when not in use, such as at night in winter, the water in the passages cools down and freezes, causing damage to the equipment. . Therefore, as a means of preventing freezing, it has traditionally been a method to drain the water inside the appliance, but the procedure is to close the water stop valve on the water supply side, open the drain valve, and install it at a high position in the water passage. This involves opening an air valve to send air into the passage to drain the water, and the series of operations is generally performed manually.

(Problem to be solved by the invention) However, in the conventional example, when the equipment is located outdoors, it is troublesome to go outside to perform the above-mentioned water draining operation, and it also has the disadvantage of being painful in severe cold. It was hot. In addition, in this case, the water stop valve,
The drain valve and air valve can be operated individually, but the operation becomes complicated and if you do the operations in the wrong order,
In other words, if the air valve was opened before the water stop valve was fully closed, a large amount of water could come out.

This invention was made in view of the above-mentioned drawbacks, and in order to simplify the drain operation of the appliance, the water supply water stop valve and air valve are integrated, and the water supply passage is closed by remote control indoors. The purpose of the present invention is to provide a water heater drain structure that can easily prevent freezing by opening the air valve immediately after that, allowing air to flow in, opening the drain valve, and opening the indoor hot water tap. .

(Means for Solving the Problems) The configuration of the present invention for achieving the above object will be explained using FIGS. 1 to 4 corresponding to the embodiments. The present invention has a water inlet, a hot water outlet, In a water heater consisting of a heat exchanger, a water passage, and a heating device, there is a water stop valve equipped with an air valve and a water stop valve operated by a thermoelement at the highest part of the water passage on the upstream side of the heat exchanger, and a water stop valve on the upstream side. A technical measure is taken in which a drain valve is provided at the lowest part, which opens when the air valve is opened after the water stop valve is shut off, and which is closed by the inflow water pressure after the water stop valve is opened.

(Function) The present invention uses the above-mentioned means to remove water from the water heater 1 to prevent freezing by using the remote controller 2.
When the heater 15 is energized by turning 0 ON, the thermoelement 13 is heated, the piston 14 moves downward, and the spring 18 first bends, causing the water stop valve 10 to come into contact with the valve seat 8c and cut off the water passage. . When the piston 14 moves further, the spring 17
The deflection causes the air valve 12 to open, and the downstream side of the water stop valve 10 communicates with the atmosphere, eliminating water pressure in the water passage. Therefore, as shown in FIG. 3, the diaphragm 22 and rod core 23 of the drain valve 9 are lowered and the valve body 24 is opened from the valve seat 26, and the water between the water stop valve 8 and the drain valve 9 is drained to the drain port 2.
By opening the hot water tap 7 in the room, water is drained from the hot water tap 7 - heat exchanger 4 - drain valve 9.
The water in between is drained from the drain port 28. Then, the heater 15 of the thermoelement 13 is energized, the drain valve 9 is opened, and the water in the water passage is drained until the next use.

When the remote control 20 is turned off to stop energizing the heater 15, the fluid in the thermoelement 13 contracts and the piston 14 is pushed up by the springs 17 and 18, the air valve 12 closes, and the water stop valve 10 opens to stop water. The passageway is filled with water. Then, as shown in FIG. 4, the diaphragm 22 and the rod core 23 are moved upward by the water pressure, and the valve body 24 is also moved, so that the valve body 24 closes the valve seat 26 and closes the drain port 28.

Note that the water stop valve 8 of the present invention performs the function of a water supply valve instead, and eliminates the trouble of closing the water supply valve 21 to prevent freezing as in the past.

(Example) An example of the present invention will be described below based on 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. Reference numeral 8 denotes a water stop valve provided at the highest point on the water supply inlet side upstream of the heat exchanger 4, and as shown in FIG. 2, the water stop valve 8 is normally used with the water stop valve 10 of the water stop valve 8 open. Reference numeral 10 denotes a water stop valve provided in the water stop valve 8, and by moving downward, it cuts off the water passage to the downstream side and stops the water supply. and water stop valve 1
An air inflow path 11 communicating with the outside air is provided inside the 0, and an air valve 12 is normally closed. 13
is a thermoelement for driving the water stop valve 10 and the air valve 12. By heating the inside with the heater 15, the sealed fluid expands and the piston 14 moves downward, and the water stop valve 10 and the air valve 12 are driven. 12
Activate. A spring 17 normally biases the air valve 12 in the closing direction, and is set to have a higher load than the spring 18 which biases the water stop valve 10 in the opening direction. A remote controller 20 for remotely controlling a water stop valve is connected to the tip of the heater power cord 16 of the thermoelement 13 .

As shown in FIGS. 3 and 4, 9 is a conventionally used drain valve that is connected to the lowest part of the water passage on the upstream side of the heat exchanger 4 and responds to the water supply pressure. The drain valve 9 includes a diaphragm 22 that responds to water pressure, a rod core 23 that is connected to the diaphragm 22 and intersects perpendicularly and has a spring seat 27 at its lower end, and a rod core 23 that is inserted through the rod core 23 and abuts the spring seat 27. a water pressure adjustment spring 25 that biases the valve body in the vertical direction; a valve body 24 that is inserted through the rod core 23 on the spring 25 and is movable up and down; It consists of a valve seat 26 and a drain port 28 below the valve body 24. That is, the drain valve 9
When the water heater 1 is in use, the valve body 24 is closed by the water supply pressure, and when no water pressure is applied, the valve body 24 is opened to drain water.

(Effect of the invention) Therefore, the present invention has a water stop valve equipped with an air valve and a water stop valve operated by a thermoelement at the highest part of the water passage on the upstream side of the heat exchanger, and a water stop valve equipped with an air valve and a water stop valve operated by a thermoelement. The structure is equipped with a drain valve that opens when the air valve is opened after the water stop valve is shut off, and is closed by the inflow water pressure after the water stop valve is opened, so water can be drained reliably from inside the room. This makes it easy to prevent freezing, and there is no risk of large amounts of water spewing out from the air valve due to incorrect operating procedures.

[Brief explanation of the drawing]

Fig. 1 is a schematic structural diagram showing an embodiment of the present invention;
The figure is a schematic cross-sectional view showing a water stop valve of the present invention, and FIGS. 3 and 4 are cross-sectional views showing a drain valve of the present invention. Explanation of symbols, 1...Water heater, 2...Water inlet, 3
...Water governor, 4...Heat exchanger, 5...Burner,
6... Hot water outlet, 7... Hot water tap, 8... Water stop valve, 8
a...Inlet of the water stop valve, 8b...Outlet of the water stop valve, 8
c...Valve seat, 9...Drain valve, 10...Water stop valve, 1
1... Air inflow path, 12... Air valve, 12a...
Air valve O-ring, 13...thermo element,
14..., 15...Heater, 15a...Heater end stop, 16...Power cord for heater, 17...Spring, 18...Spring, 19...O ring, 20...
Remote controller, 21... Water supply valve, 22... Diaphragm, 23... Rod core, 24... Valve body, 25...
Spring, 26... Valve seat, 27... Spring seat, 28...
drain.

Claims (1)

[Scope of utility model registration request] In a water heater consisting of a water inlet, a hot water outlet, a heat exchanger, a water passage, and a heating device, the water stop is equipped with an air valve and a water stop valve operated by a thermoelement at the highest part of the water passage on the upstream side of the heat exchanger. A drain valve is provided at the lowest part on the upstream side, which opens when the air valve is opened after the water stop valve is shut off, and which is closed by the inflow water pressure after the water stop valve is opened. Water drain structure for water heater.