JPS622408Y2 - - Google Patents

Description

[Detailed description of the invention] This invention involves sequentially installing a hot water pump and an air-filled accumulator in the middle of a hot water pipe that connects a hot water storage tank and a hot water tap. This invention relates to a pump-feeding water heater that pumps hot water to the side and controls the start and stop of a hot water pump via a pressure switch that detects air pressure in an accumulator.

Generally, when an accumulator filled with air is installed in a hot water supply pipe, during long-term use, the air inside the accumulator is gradually discharged to the outside along with the hot water, and the air inside the accumulator is released. When the amount of air decreases, even if the hot water tap is closed, if there is even a small leak from the hot water tap, the pressure inside the accumulator will immediately drop significantly, driving the pump, and then immediately after that. The pump frequently starts and stops, causing pump noise or failure.

In order to prevent such problems from occurring,
All you have to do is replenish air into the accumulator as appropriate to maintain the amount of air in the accumulator close to a predetermined amount at all times.To achieve this purpose, conventional pumps have been activated when the hot water pump starts and stops. A system has been developed in which an air pump is installed in the hot water supply pipe and the air pump is used to supply air into the accumulator.

However, when using an air pump to replenish air into the accumulator, water leaks may occur because the air pump is connected midway through the hot water supply pipe, or a relatively expensive air pump is used. There was a problem of high costs.

In view of the above-mentioned problems with conventional pump-feeding water heaters, the purpose of the present invention is to propose a pump-feeding water heater that can supply air to the accumulator using a simple and inexpensive means. In a pump-forced water heater having the basic configuration as shown in the header, a capillary reach tube of an appropriate diameter is provided in the hot water pipe at a position upstream of the hot water pump, one end of which is opened to the atmosphere, Installed in the hot water supply pipe with the other end opened toward the flow direction of hot water in the hot water supply pipe,
When the hot water supply pump is operated, air can be sucked into the hot water supply pipe through the capillary reach tube due to the ventilary effect of the hot water flowing through the hot water supply pipe.

Hereinafter, the pump pressure water heater 30 of the present invention will be described as an example of the pump pressure water heater 30 shown in FIG. It has a hot water storage tank 1 with a water heat exchanger 7 attached to the bottom. Refrigerant pipes 5 and 6 are connected to this water heat exchanger 7, and the hot gas sent from the refrigerator (not shown) is condensed into liquid refrigerant in the water heat exchanger 7. The water in the hot water storage tank 1 is heated by the heat of condensation. In addition, the cold water sent from the water supply pipe 2 side via the ball tap valve 3 is
Internal water supply pipe 4 installed along the side wall of the hot water storage tank 1
is sent to the bottom of the hot water storage tank 1, where it is heated by the water heat exchanger 7.

Hot water connection pipe 8 provided on the upper side wall of the hot water storage tank 1
and the hot water supply faucet 19 are connected by a hot water supply pipe 9. This hot water pipe 9 includes, in order from the hot water storage tank 1,
Hot water pump 15, check valve 20, accumulator 1
6. A flow switch 18 is installed.
Further, a pressure switch 7 is attached to the accumulator 16, which operates in response to changes in the pressure of the air sealed within the accumulator 16. The hot water supply pump 15 is controlled to start and stop by the pressure switch 17 and flow switch 18.

Furthermore, a capillary reach tube 25 of an appropriate diameter, which is the main body of the present invention, is attached to the inlet of the hot water supply pipe 9 on the side of the hot water storage tank 1. This capillary reach tube 25 is bent into a U-shape, and has one end 25a open to the atmosphere above the hot water level in the hot water storage tank 1, while the other end 25a
b is inserted into the hot water supply pipe 9 from the inside of the hot water storage tank 1, with its open end facing the hot water flow direction. In this way, the capillary reach tube 2 is connected to the hot water pipe 9.
5 is installed, the hot water pump 15 operates, and when the hot water in the hot water storage tank 1 flows from the hot water storage tank 1 side to the hot water pump 15 side, this capillary reach tube 2
A negative pressure suction force is generated at the other end 25b of the hot water supply pipe 5 due to the Ventury effect, and air is sucked into the hot water supply pipe 9 through the capillary reach tube 25 by this negative pressure suction force. The air sucked into the hot water supply pipe 9 mixes with the hot water and flows down from the hot water supply pump 15 to the accumulator 16 side, and is separated from the hot water in the accumulator 16, and a part of it flows into the air reservoir at the upper part of the accumulator 16. The other air is stored in the accumulator 16a, and other air flows out from the accumulator 16 together with the hot water. In this way, the amount of air replenished into the accumulator 16 through the capillary reach tube 25 along with the hot water and the amount of air discharged from the inside of the accumulator 16 to the outside along with the hot water both change approximately in proportion to the flow rate of the hot water. The amount of air stored in the air reservoir 16a in the air tank 16 is always maintained at a substantially constant amount. Therefore, the problem that the hot water supply pump 15 repeatedly starts and stops due to insufficient amount of air in the accumulator 16 is eliminated.

In the illustrated embodiment, a capillary reach tube 25 is provided at the inlet of the hot water supply pipe 9, but in other embodiments of the present invention, the capillary reach tube 25 is shown, for example, by a chain line (reference numeral 25'). It may also be provided in the middle of the hot water supply pipe 9, as shown in FIG. However, in this case, it is necessary to provide a check valve 27 to prevent hot water from flowing back into the capillary reach tube 25.

In FIG. 1, reference numeral 10 is an overflow pipe, 11 is a drain pipe, 12 is a return pipe for hot water for preventing freezing of pipes in the machine, and 21 is a solenoid valve.

Next, to explain the effects of the present invention, the pump pressure feed water heater of the present invention can supply hot water by installing a simple and inexpensive capillary reach tube between the hot water storage tank and the hot water pump in the hot water supply pipe. When the pump is operated, air is sucked into the hot water pipe through the capillary reach tube due to the ventilary effect of the hot water in the hot water pipe, allowing air to be replenished into the accumulator installed downstream of the hot water pump. It is not necessary to attach a relatively expensive device such as an air pump for replenishing air to the hot water pipe as in a pump pressure water heater, and there is a practical effect that the device can be simplified and the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a pump pressure water heater according to an embodiment of the present invention. 1...Hot water storage tank, 9...Hot water supply pipe, 15...Hot water supply pump, 16...Accumulator, 17...Pressure switch, 18...Flow switch, 19...Hot water tap, 25
...Capillar Reach Youtube.

Claims (1)

[Scope of utility model registration request] A hot water pump 15 and an air-filled accumulator 16 are sequentially installed in the middle of the hot water pipe 9 connecting between the hot water storage tank 1 and the hot water tap 19, and the hot water pump 15 supplies the hot water in the hot water storage tank 1 to the hot water supply. A pressure switch 17 that pressure-feeds air to the stopper 19 side and detects the air pressure inside the accumulator 16.
This is a pump pressure feed type water heater that controls the start and stop of the hot water supply pump 15 through a pump, in which a capillary reach tube 25 of an appropriate diameter is installed in the hot water pipe 9 at a position upstream of the hot water supply pump 15. The hot water supply pipe is installed with one end 25a open to the atmosphere and the other end 25b opened in the hot water supply pipe 9 toward the flow direction of hot water in the hot water supply pipe 9, and when the hot water supply pump 15 is operated, the hot water supply pipe 9. A pump pressure-feed water heater characterized in that air can be sucked into the hot water supply pipe 9 through the capillary reach tube 25 by the ventilic effect of the hot water flowing through the hot water supply pipe 9.