JPH0315977Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a hot water storage type water heater, and more specifically, to measures to prevent variations in the amount of water supplied due to differences in tap water pressure depending on the region of use.

(Prior art) The present applicant previously filed Japanese Patent Application No. 57-231082 (Japanese Unexamined Patent Publication No.
No. 59-119132), a hot water storage type water heater that supplies hot water at a constant temperature includes a hot water storage tank for storing hot water, a heater disposed at the bottom of the hot water storage tank that generates heat by a heat pump type refrigeration cycle, and one end. A water supply pipe connected to the water pipe and having its other end open to the hot water storage tank and supplying water to the hot water storage tank, a hot water pipe having one end opened to the hot water storage tank and the other end connected to a hot water tap, and the water supply pipe described above. The tank is equipped with a water supply valve consisting of a ball tap valve that is installed at the opening of the tank to detect the water level of the reservoir water and control the opening and closing of the water supply pipe.When hot water is supplied, the hot water in the hot water storage tank is supplied to the hot water tap via the hot water supply pipe. In addition, we have proposed a system that detects a drop in the water level in the hot water storage tank and opens the water supply valve to supply water from the water supply pipe to restore the water supply amount to the target water supply amount. There is.

(Problems to be Solved by the Invention) In the above-mentioned conventional water supply valve, the valve element of the water supply valve, which is a ball tap valve, obtains the valve-closing force by the buoyancy of the float, while the valve-opening force is obtained by the tap water pressure acting on the valve element. I am getting . Therefore, if the water heater is used in an area where the tap water pressure is abnormally lower than normal pressure (standard water pressure), the opening force of the valve body due to the tap water pressure will be weaker than usual, so the water level will be lower than normal. position and the buoyancy of the float is small (when the volume of the float part below the water surface is small)
The valve-closing force and the valve-opening force become balanced, and the water supply amount becomes less than the target water supply amount. As a result, there was a problem in that the amount of water supplied varied depending on the area of use.

Therefore, it is possible to eliminate variations in the amount of water supplied by providing water supply valves with different specifications depending on the level of tap water pressure. However, there is a problem in that the cost is high because the water supply valve cannot be solved by using the same product.

The present invention was developed in view of the above, and aims to prevent variations in the amount of water supplied due to differences in tap water pressure of water heaters by using a simple structure while ensuring product uniformity. It is something.

(Means for Solving the Problem) In order to achieve the above object, the solution means of the present invention includes a hot water storage tank 1 for storing hot water and an opening in the hot water storage tank 1, as shown in FIGS. 1 and 2. It has a water supply pipe 8 that supplies tap water to the hot water storage tank 1, a valve body 24 interposed in the water supply pipe 8, and a float 27 arranged in the hot water storage tank 1, and the buoyancy of the float 27 is The water supply valve 9 is provided with a ball tap valve that controls the opening and closing of the water supply pipe 8 according to the water level of the water stored in the hot water tank 1 as the valve opening force and the tap water pressure acting on the valve body 24 as the valve closing force. It is a hot water storage type water heater,
In the water supply valve 9, the pressure receiving area of the valve body 24, which controls the valve opening force due to the tap water pressure, is set larger than the standard pressure receiving area of the valve body, which is determined by the standard tap water pressure so that the target water supply amount is achieved. It is configured such that the amount of water supplied relative to the water pressure is greater than the target amount of water supplied, and on the other hand, it is detachably provided in the water supply passage upstream of the water supply valve 9 of the water supply pipe 8, and when the tap water pressure is standard pressure. Orifice plate 2 for pressure reduction that is installed and removed when the pressure is lower than the standard pressure
8.

(Function) With the above configuration, in the present invention, in areas where the tap water pressure is standard pressure, by installing the orifice plate 28, the tap water pressure acting on the valve body 24 of the water supply valve 9 is lower than the standard pressure. However, since the pressure receiving area of the valve body 24 is larger than the standard pressure receiving area, the water supply amount of the water supply valve 9 becomes the target water supply amount.

On the other hand, in areas where the tap water pressure is lower than the standard pressure, by removing the orifice plate 28,
Although the tap water pressure acting on the valve body 24 of the water supply valve 9 remains lower than the standard pressure, the decrease in water supply amount due to this decrease in tap water pressure is caused by the fact that the pressure receiving area of the valve body 24 of the water supply valve 9 is larger than the standard pressure receiving area. The amount of water supplied by the water supply valve 9 is compensated by the setting, and the amount of water supplied by the water supply valve 9 becomes the target amount of water supplied.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment of a heat pump water heater according to the present invention, in which 1 is a hot water tank for storing hot water, and 2 is a water heat exchanger immersed in stored water at the bottom of the hot water tank 1. The water heat exchanger 2 is connected to a compressor 4, an expansion valve 5, and an evaporator 6 through refrigerant piping 3 so that refrigerant can be circulated, and the refrigerant is circulated in the direction shown by the solid arrow in the figure to form a heat pump refrigeration cycle. A heating device 7 is constituted which, when operated, supplies heat obtained by the evaporator 6 to the water heat exchanger 2 to generate heat, thereby heating the water stored in the hot water storage tank 1.

Reference numeral 8 indicates a water supply pipe having one end connected to a water pipe and the other end opening at the upper part of the hot water storage tank 1 to supply tap water to the hot water storage tank 1; A water supply valve 10 is a water supply valve consisting of a ball tap valve that controls the opening and closing of the water supply pipe 8 according to the level of water stored in the water supply tank 1, and 10 is a hot water storage tank whose upper end opens directly below the water supply valve 9 and whose lower end opens at the bottom of the hot water tank 1. This is a water replenishment pipe installed vertically on the side of the hot water tank 1, and when the water level of the stored water in the hot water storage tank 1 falls below a predetermined water level, the water supply valve 9 is activated.
opens and transfers tap water from the water supply pipe 8 to the water supply pipe 10.
Water is supplied to the bottom of the hot water tank 1 via the hot water storage tank 1.

Reference numeral 11 denotes a hot water supply passage, one end of which opens at a position directly below a predetermined water level in the hot water storage tank 1, the other end connected to a hot water supply faucet 12, and a hot water supply passage that pumps hot water from the hot water storage tank 1 along the way. A pump 13 and an accumulator 14 are interposed. The accumulator 14
is provided with a pressure switch 15 that is turned on when the pressure in the hot water supply passage 11 is below a predetermined pressure. When the pressure switch 15 detects a pressure drop (pressure drop in The operation of the hot water pump 13 is stopped by turning off the pressure switch 15 when the pressure rise is detected.

Furthermore, 16 is a thermostat attached to the outer surface of the hot water storage tank 1, and the thermostat 16
detects that the temperature of the water stored in the hot water storage tank 1 is lower than the set temperature, and in that case, the compressor 4 of the heating device 7 is activated to cause the water heat exchanger 2 to generate heat to cool the water inside the hot water storage tank 1. water is heated, and when the temperature exceeds a set temperature, the operation of the compressor 4 is stopped to stop heating.

Thus, hot water in the hot water storage tank 1 is supplied from the hot water tap 12 via the hot water supply passage 11, and as a result, when the water level of the hot water drops, water is supplied to the hot water storage tank 1 through the water supply pipe 10 by the water supply valve 10. The water level is maintained at a predetermined water level, and a heating device 7 is activated by a thermostat 16 to heat 7 the replenished water to a predetermined temperature.

Here, as shown in FIG. 2, the water supply valve 9 has a water supply pipe connection port 17 to which the water supply pipe 8 is connected at one end, and a water conduit pipe 18 for guiding water to the water supply pipe 10 at the other end. A valve body 21 has a water conduit connection port 19 and a water supply passage 20 that communicates between the two connection ports 17 and 19 is formed, and a valve body 21 is removably interposed in the middle of the water supply passage 20 of the valve body 21. A filter 22 that filters water, a valve seat 23 formed in the water supply passage 20 downstream of the filter 22, a valve body 24 that opens and closes the water supply passage 20 by coming into contact with and away from the valve seat 23, and one end of which is connected to the valve body 21. an arm 25 that is rotatably supported and provided with a valve body pressing portion 25a that presses the valve body 24 at a portion corresponding to the bottom surface of the valve body 24 in the middle;
A spherical float 2 whose one end is rotatably supported on the valve body 21 and whose other end moves up and down with the level of the stored water.
7 is attached, and the intermediate portion thereof consists of a float lever 26 connected to the other end of the arm 25 via a link 33. The buoyant force of the float 27 is used as a valve-closing force, and the tap water pressure acting on the valve body 24 is used as a valve-opening force. When the water level of the stored water in the hot water storage tank 1 falls below a predetermined water level, the float 27 lowers. As the arm 25 rotates clockwise in FIG. 2 via the float lever 26, the valve body pressing portion 25
a is separated from the valve body 24, and the valve body 24 is connected to the water supply passage 2.
The working water pressure of the tap water moves downward, opening the water supply passage 20 and supplying water. On the other hand, when the water level reaches a predetermined water level, the arm 25 rotates counterclockwise as the float 27 rises. By moving the valve body, the valve body 24 is brought into contact with the valve seat 23 by the valve body pressing portion 25a against the above-mentioned working water pressure, thereby closing the water supply passage 20.

As a feature of the present invention, the water supply valve 9
is configured such that the amount of water supplied relative to the standard tap water pressure acting on the water supply valve 9 is greater than the target amount of water supplied. That is, in the water supply valve 9, the pressure-receiving area of the valve body 24 that controls the valve opening force due to tap water pressure is set larger than the standard pressure-receiving area of the valve body, which is determined to achieve the target water supply amount based on the standard water pressure as the tap water pressure. The valve opening force is set to be larger than the standard value, and when the water level is higher than usual and the buoyancy of the float 27 is large (the volume of the float part below the water surface is large). When the valve-closing force and the valve-opening force are balanced for the first time, the water supply amount becomes larger than the target water supply amount.

Furthermore, as shown in FIG. 2, the water supply passageway upstream of the water supply valve 9 of the water supply pipe 8 is equipped when the tap water pressure is standard pressure, so that the water pressure acting on the valve body 24 is adjusted to the area where the tap water pressure is low. The orifice plate 28 is removably inserted and fixed so that the tap water pressure is depressurized and corrected so that the water pressure becomes equal to the tap water pressure of , and is removed when the tap water pressure is lower than the standard pressure.

In addition, 29 is a check valve installed in the hot water supply passage 11,
30 is a hot water discharge pipe, 31 is a hot water discharge valve, and 32 is an overflow pipe.

Therefore, in the above embodiment, when the water heater is used in an area where the tap water pressure is normal and standard pressure, if the orifice plate 28 is attached to the water supply pipe 8, the orifice plate 28 will reduce the tap water pressure. is reduced, the water pressure acting on the valve body 24 of the water supply valve 9 is reduced to the water pressure in the area where tap water pressure is low, and the water supply amount of the water supply valve 9 becomes the target water supply amount.

On the other hand, when using the water heater in an area where the tap water pressure is lower than the standard pressure, the orifice plate 28
If the valve element 24 of the water supply valve 9 is removed, the amount of water supplied due to the decrease in water pressure acting on the valve element 24 of the water supply valve 9 will be reduced.
The amount of water supplied by the water supply valve 9 becomes the target amount of water supplied by the water supply valve 9, which is compensated for by the setting of the increase in the pressure receiving area, and there is no shortage of water supply.

As a result, it is possible to prevent variations in the amount of water supplied due to differences in tap water pressure due to differences in areas of use, etc., and it is possible to keep the amount of water supplied constant. Moreover, this constant water supply amount is achieved by adjusting the orifice plate 28 according to the tap water pressure.
This can be done by a simple method of attaching and detaching the water heater, and it is advantageous in terms of cost because the same water heater can be used for each area of use.

(Effects of the invention) As explained above, according to the hot water storage type water heater of the invention, the water supply valve, which is a ball tap valve that controls the opening and closing of the water supply pipe, is adjusted to the amount of water supplied relative to the standard water pressure acting on the valve body of the water supply valve. Even with a simple structure in which the orifice plate is set so that it is larger than the target water supply amount, and an orifice plate is removably installed in the water supply passage upstream of the water supply valve of the water supply pipe, the orifice plate will not work in areas where the tap water pressure is standard water pressure. By attaching the water heater, or by removing the orifice plate in areas where the tap water pressure is lower than the standard water pressure, the target water supply amount can be obtained. This has an excellent practical effect in that a constant amount can be easily and inexpensively achieved with the same product.

[Brief explanation of drawings]

FIG. 1 is an overall schematic configuration diagram showing an embodiment of the present invention, and FIG. 2 is an enlarged longitudinal sectional side view of a water supply valve. 1... Hot water storage tank, 8... Hot water pipe, 9... Water supply valve,
28... Orifice plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A hot water storage tank 1 for storing hot water, a water supply pipe 8 that opens into the hot water storage tank 1 and supplies tap water to the hot water storage tank 1, and a valve body installed in the water supply pipe 8. 24 and a float 27 arranged in the hot water storage tank 1, the float 2
water supply valve 9 consisting of a ball tap valve that controls the opening and closing of the water supply pipe 8 according to the water level of the water stored in the hot water storage tank 1, using the buoyant force of 7 as the valve closing force and the tap water pressure acting on the valve body 24 as the valve opening force; The water supply valve 9 has a standard valve body in which the pressure receiving area of the valve body 24 that controls the valve opening force due to the tap water pressure is determined to be the target water supply amount based on the standard tap water pressure. It is set larger than the pressure receiving area, and is configured so that the water supply amount for standard tap water pressure is greater than the target water supply amount.On the other hand, it is freely attachable and detachable to the water supply passageway upstream of the water supply valve 9 of the water supply pipe 8. A hot water storage type water heater, characterized in that it is provided with a depressurizing orifice plate 28 that is installed when the tap water pressure is at a standard pressure and is removed when the tap water pressure is lower than the standard pressure.