JPS61231349A - Hot water storage type hot water supply device - Google Patents

Abstract

PURPOSE:To obtain a hot water storage type hot water supply device capable of reducing heat loss and being operated economically, by a system wherein water contained in a lower part of a hot water storing tank is fed back to the vicinity of a hot water tapping port of the tank through a hot water recovering pipe. CONSTITUTION:When hot water supply is started by opening a cock valve 6, a hot water supplying pipe 4 is filled with hot water. A detection signal indicative of the closing of the valve 6 is sent to a controller 10 with a timer, a three-way valve 7 is switched from a-b connection to a-c connection after a predetermined lapse of time, and simultaneously, a circulating pump 8 is operated. As a result, city water contained in the lower part of the hot water storing tank 2 is fed backward to pass through the hot water recovering pipe 9 and the valve 7, and pushes back hot water contained in the pipe 4 between the valve 7 and the tank 2 to an upper part of the tank 2. When water flowing back from the lower part of the tank 2 reaches the hot water tapping port part of the upper part of the tank 2, the temperature thereof is detected by a water temperature detector 11, and when the detected temperature becomes not higher than a presert temperature, hot water contained in the pipe 4 is completely recovered into the tank.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a hot water storage type water heater that is capable of recovering hot water accumulated in a hot water supply pipe connected to a hot water storage tank into the hot water storage tank after hot water is supplied. .

[Prior art]

A conventional hot water storage type water heater will be explained with reference to FIG.

In Fig. 3, 1 is a heating device, 2 is a hot water tank, 3 is a faucet connected to the upper part of the hot water tank 2 by a hot water supply pipe 4, and 5 is a city water intake pipe connected to the lower part of the hot water tank 2. .

In the conventional hot water storage type water heater configured as described above, when hot water is to be supplied, when the faucet 3 is opened, the hot water in the hot water storage tank 2 is pushed up by city water pressure and is supplied from the faucet 3 through the hot water supply piping. Ru. When the faucet 3 is closed, hot water remains in the hot water supply pipe 4.

If hot water is to be supplied again immediately after the faucet 3 is closed, the hot water that has accumulated in the hot water supply pipe 4 may not be used effectively, but as time passes, the temperature of the hot water that has accumulated in the hot water supply pipe 4 will decrease due to heat loss. decreases and is wasted.

[Problem that the invention seeks to solve]

As mentioned above, when hot water is supplied by a conventional hot water storage type water heater, there is a problem that the hot water accumulated in the hot water supply piping becomes cold water and is wasted after a certain period of time has passed after hot water supply.

This invention solves the above-mentioned problems of the conventional hot water supply system and recovers warm water collected in the hot water supply pipe into a storage tank, thereby reducing heat loss and enabling economical operation. The purpose is to provide an opportunity.

[Means for solving problems]

In the hot water storage type water heater according to the present invention, a three-way valve is provided in the hot water supply pipe between the hot water storage tank and the faucet valve, and a branch of the three-way valve is connected to the city water intake pipe or the lower part of the hot water storage tank by a hot water recovery pipe having a circulation pump. It is connected.

[Effect]

Since the hot water storage type water heater of the present invention is configured as described above, after hot water is supplied, the three-way valve is connected to the hot water recovery piping side, and the circulation pump is operated to drain water from the lower part of the hot water storage tank to the hot water recovery piping. The hot water in the hot water supply pipe between the hot water tank and the three-way valve can be recovered by flowing back into the upper part of the hot water tank, thus reducing heat loss compared to conventional methods. It can be reduced.

〔Example〕

Hereinafter, the hot water storage type water heater of the present invention will be explained with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 2 denotes a hot water storage tank in which water is heated by a heating device 1, and a hot water supply pipe 4 having a faucet 3 at its tip is provided with a faucet valve 6 made of an electromagnetic valve at the tip. A three-way valve 7 is provided on the side of these hot water storage tanks 2 near the faucet valves 6 of 4. A branch C of the three-way valve 7 is connected to the lower part of the hot water tank 2 or to a portion of the city water intake pipe 5 connected to the lower part of the hot water tank 2 near the hot water tank 2 by a hot water recovery pipe 9 having a circulation pump 8. In FIG. 1, 10 is a control device with a timer, 1
Reference numeral 1 denotes a water temperature detector that detects the water temperature at the outlet of the hot water storage tank 2 .

The operation of the hot water supply type 1ell of the embodiment configured as described above will be explained with reference to the operation flow shown in FIG. 2. Incidentally, most of the control procedure shown in FIG. 2 is performed by the circuits within the timer-equipped control device 10.

In Figure 2, 1. First, hot water supply starts when the faucet valve 6 is manually opened (step 81), and hot water continues to be supplied when the faucet valve 6 is manually closed (step S2)*. During this time, the hot water supply pipe 4 is filled with hot water. A detection signal indicating that the faucet valve 6 is closed is sent to the timer-equipped control device 10, and the timer of this control device 10 operates, and after a certain period of time, such as 2 minutes, the three-way valve 7 is closed.
(a)-(b)! From the continuation, switch to (a) = (c) connection, and at the same time operate (ON) the circulation pump 8 (
Step 84).

In this way, the city water that had been flowing into the lower part of the hot water storage tank 2 flows backwards, passes through the hot water recovery pipe 9, and the three-way valve 7.
The hot water accumulated in the three-way valve 7 and the hot water supply pipe 4 of the hot water tank 2 wI is pushed back to the upper part of the hot water tank 2. When the water □ flowing back from the lower part of the hot water storage tank 2 reaches the hot water outlet in the upper part of the hot water storage tank 2, the water temperature detector 11 detects the water temperature, and when the detected water temperature becomes below the set temperature, the hot water supply piping 4 To confirm that all the hot water accumulated in the hot water tank 2 has been collected into the hot water storage tank 2, in step S5), the circulation pump 8 is stopped (OFF), and at the same time, the three-way valve 7 is connected (a) to (b). After switching, the process returns to step S1 in preparation for the next feed i.

In this embodiment, after the faucet valve 6 is closed, the hot water collected in the hot water supply pipe 4 will not be recovered until the set time of the timer of the timer-equipped control device 10 has elapsed, so the timer settings are not correct. If the faucet valve 6 is opened within the specified time, the hot water accumulated in the hot water supply pipe 4 will be supplied to the hot water supply pipe 4.
In this case, the timer returns to the starting point. Also,
If the faucet valve 6 is opened during the hot water recovery operation, the hot water recovery operation is stopped at the same time. Furthermore, the three-way valve is (a)=
In the case of the (c) connection, it is preferable that the hot water on the faucet valve 6 side also be allowed to flow back into the upper part of the hot water storage tank via the (b) side of the three-way valve.

〔Effect of the invention〕

As explained above, according to the present invention, the hot water accumulated in the hot water supply piping after hot water supply is transferred to the hot water recovery piping, the circulation pump,
A three-way valve allows water to flow back into the tank and be recovered.
It is possible to provide a hot water storage type water heater that can reduce heat loss and is economical to operate.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a hot water storage type water heater according to an embodiment of the present invention, FIG. 2 is a diagram showing the operation control 70-, and FIG. 3 is a configuration diagram showing a conventional hot water storage type water heater. 1... Heating device, 2... Hot water tank, 3... Faucet, 4
...Hot water supply piping, 5.. City water intake piping, 6.. Faucet valve, 7.. Three-way valve, 8.. Circulation pump, 9.. Hot water recovery piping, 10. Control device with timer, 11
...Water temperature detector. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (and 2 others) Figure 1 6: Conclusion ρ ÷ Diagram 2 Valve 9 l Procedural amendment (voluntary) October 1985 1B

Claims (3)

[Claims] (1) A hot water tank equipped with a heating device and connected to the city water intake pipe, a three-way valve installed in the hot water supply pipe between the hot water tank and the faucet valve, a branch of this three-way valve, and the above city water intake pipe. Alternatively, a hot water storage type water heater characterized by being equipped with hot water recovery piping connected to a lower part of a hot water storage tank and having a circulation pump. (2) The three-way valve is connected to the hot water recovery piping side after the faucet valve is closed and a set time has elapsed by a control device with a timer, and the circulation pump is connected to the hot water recovery piping side of the three-way valve by the above control device. A hot water storage type water heater according to claim 1, which is configured to operate simultaneously. (3) The three-way valve is connected to the faucet valve side when the water temperature at the hot water outlet of the hot water storage tank falls below the set temperature after the circulation pump is operated by the control device with a timer. The hot water storage type water heater according to claim 1, wherein the hot water storage type water heater is configured to stop at the same time as the three-way valve is connected to the faucet valve side.