JPS5818569B2 - Yuwakashikino Touketsuboushisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used in water heaters such as gas instantaneous water heaters, and prevents residual water inside the water heater from freezing even when the ambient temperature drops to near 0°C. This invention relates to an antifreeze device that does not damage equipment.

Conventional Structure and Problems In conventional water heaters, water is drained from the water circuit by closing the drain valve each time, thereby preventing the water from freezing.

However, when draining water in a device that relies on availability, mistakes are bound to occur. For example, if you forget to drain the water, the water circuit of the water heater freezes, and its volume expands, causing damage to the water circuit and malfunction of this equipment. I was awake.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a water heater that will not be damaged by freezing in the winter and will not leak water due to heat in the summer. purpose.

Structure of the Invention In order to achieve the above object, the present invention takes the following technical measures.

That is, the main body is made of a material having a large coefficient of thermal expansion and has a water drain passage connected to the water circuit of the water heater and has a valve seat formed therein, and a water drain valve that opens and closes the valve seat of the water drain passage.
A sensing fluid that freezes near ℃ and causes a volume change, and operates in accordance with the volume change of this sensing fluid to cause the above-mentioned water removal off-duty displacement,
This water heater anti-freezing device is characterized in that it comprises an operating body separate from the water drain valve.

This made it possible to mechanically and physically open water drainage channels when the temperature approached freezing.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a water circuit of a water heater, and a heat exchanger 2 is formed in the middle.

3 is a water source frame on the water supply side, 4 is a water source frame on the appliance side, 5 is a water governor, and 6 is a water draining device, the configuration of which is as shown in FIG.

That is, in FIG. 2, 7 is a cylindrical body made of a material with a low coefficient of thermal expansion, such as synthetic resin, with a valve seat 8 on the upper part and a water drain port 9 communicating with the valve seat 8 on the lower peripheral wall. A connecting pipe 10 led out from the water circuit 1 is connected to the valve seat 8 side via a backing 11, and a fluid case 12 made of a material having good thermal conductivity, such as copper, is provided at the bottom. It is closed by a boss portion 13.

The fluid case 12 is filled with a test fluid 14 such as water that freezes near O'C, and its shape is such that the bottom plate is largely displaced upwards so that it can easily come into contact with the outside air.

Of course, this fluid case 12 is installed outside the boiler so that it is easily affected by the outside temperature.

15 is a backing 1 attached to the boss portion 13 of the liquid case 12.
6, the actuator is slidably penetrated through the actuator, and has a water supply passage 17 in the direction of its central axis, and a valve seat 1 at the lower end.
8 is the formation.

The valve seat 18 is normally closed by a valve 20 energized by a spring 19.

21 connects the valve rod 22 to the actuating body 1 via the backing 23.
5, which is slidably inserted into the water drain valve 5, and is normally energized by a spring 24 to close the valve seat 8. In the direction of the central axis, water i2 communicates with the water supply path 17 of the actuating body 15.
Further, the valve rod 22 has a stepped portion 26 in the middle thereof, and this stepped portion 26 and the upper end surface of the actuating body 15 are opposed to each other.

In addition, 27 in the figure is a spring for returning the operating body 15.

In the above configuration, FIG. 2 shows the normal operating state of the water heater or the out-of-operation state during the period when freezing does not occur.
That is, the drain valve 21 closes the valve seat 8 via the spring 24, and the actuating body 15 is positioned below via the spring 27.

At this time, if the detected liquid 14 in the liquid case 12 decreases due to factors such as evaporation, a pressure difference will occur between the water circuit 1 to which water pressure is applied and the liquid case 12, and the valve will resist the spring 19. 0 opens.

Therefore, water in the water circuit 1 is replenished into the liquid case 12 through the water channel 25 of the drain valve 21 and the water replenishment passage 17 of the operating body 15.

When the supply of water into the liquid case 12 is completed, the internal pressure increases, and the valve 20 is again closed by the spring 19.

Next, when the water heater is operated in winter, the temperature of the water flowing through the water circuit 1 is transmitted to the liquid case 12, and the detection liquid 14 therein does not freeze.

However, when the burner etc. stops burning and the water heater stops operating, there is no flow of tap water in the water circuit 1, so
The water in this water circuit 1 is cooled, and the detection liquid 14 in the liquid case 12 is also cooled.

However, the detection liquid 14 is filled in a liquid case 12 that has good contact with the outside air, and this liquid case 1
Since water heater 2 is installed in a location outside the water heater that is easily affected by the outside temperature, it freezes much earlier than the water remaining in water circuit 1.

When the sensing liquid 14 freezes, its volume increases and the actuating body 15 is pushed upward.

At this time, the upper end surface of the actuating body 15 comes into contact with the stepped portion 26 of the valve rod 22 and displaces it upward.

Therefore, since the liquid valve 21 is separated from the valve seat 8, the residual water in the water circuit 1 is discharged through the connecting pipe 10→valve seat 8→water drain port 9.

Incidentally, since the water draining from the water circuit 1 is carried out in a short time, the temperature of the water flowing to the water drain port 9 does not adversely affect the freezing of the detection liquid 14.

Next, when the water heater is brought into operation from the water draining state, a portion of the tap water flowing into the water circuit 1 flows continuously from the connecting pipe 10 to the valve seat 8 to the water draining port 9.

The frozen state of the detection liquid 14 in the liquid case 12 is gradually dissolved at the above-mentioned water temperature, and finally returns to its original liquid state.

Therefore, since its volume decreases, the actuating body 15 is lowered by the action of the spring 27, and the drain valve 21 is also moved by the action of the spring 24.
This action closes the valve seat 8.

From the above, the water heater returns to its normal operating state.

By the way, the volume change of the sensing liquid 14 occurs not only when it freezes, but also when its temperature rises in the summer, so-called thermal expansion occurs.

The volume change due to the thermal expansion is much smaller than that during freezing, but no matter how small the volume change is, the actuating body 15 that responds to it will be displaced upward.

However, in the above configuration, the main body 7 undergoes thermal expansion and its length increases, and a play t is formed between the upper end surface of the actuating body 15 and the valve rod 22.
Since the displacement 5 is absorbed by the play t, the drain valve 21 does not operate.

As a result, even when the outside temperature is high, such as in summer, water in the water circuit 1 does not leak and can be operated reliably.

Of course, in winter, the main body 7 contracts, so the play t disappears.

Therefore, the water draining operation can be performed reliably.

As described in detail, according to the present invention, the volume change when the detected liquid freezes is used to open the drain valve, so that the water in the water circuit is automatically drained and the circuit due to freezing is opened. In addition, if the detection liquid undergoes thermal expansion during the summer, the main body becomes longer and play is formed between the actuating body and the water drain, ensuring that no water leaks during the summer. It is possible to operate a water heater.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a water heater showing an embodiment of the present invention;
FIG. 2 is a sectional view of the water draining device. 1...Water circuit, 7...Main body, 8...
... Valve seat, 14... Sensing liquid, 15...
...Operating body, 21... Drain valve.

Claims (1)

[Claims] 1. Made of a material with a high coefficient of thermal expansion, it has a water circuit, a connecting pipe whose one end communicates with the water circuit and whose lower end is open, and a valve seat and water drain port that are connected to the connecting pipe and communicate with the opening at the lower end. A cylindrical main body, a fluid case having an inverted U-shaped cross section connected to the lower end opening of the main body and communicating with the water circuit, and a fluid case located between the fluid case and a valve rod that opens and closes the valve seat of the main body. An actuating body moves when the fluid in the case freezes and operates the valve lever in the opening direction, and a ball valve opens and closes the valve seat at the lower end of the actuating body. Fluid is replenished into the fluid case through the valve rod and the hollow part of the operating body, and when the fluid freezes, the operating rod is pushed up to open the valve seat of the main body and enter the water circuit. The antifreeze device for a water heater is configured to drain the fluid from the water outlet of the main body, and to provide a play t between the upper end surface of the operating rod and the contact surface of the valve rod.