JPH0740930Y2 - Hot water storage system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot water storage type hot water supply device.

2. Description of the Related Art In a hot water storage type hot water supply device, the upper and lower parts of a hot water storage tank are connected by a circulation pipe, a heating device such as an instantaneous water heater is interposed in the middle of this circulation pipe, and a pump circulates water in the circulation pipe. It is configured to store hot water by pumping and stratifying the temperature in the hot water storage tank from the top to the bottom.

Such a hot water storage type hot water supply device has an advantage that a large amount of hot water can be supplied at one time, but after the hot water in the hot water storage tank is exhausted by the hot water supply, the hot water storage tank is filled with water. Therefore, there is a drawback that the hot water supply temperature is lowered and hot water having a desired temperature cannot be immediately supplied.

Problem to be Solved by the Invention The purpose of the present invention is to be able to supply a large amount of hot water at one time and to maintain the desired hot water even after the hot water in the hot water storage tank is exhausted. It is to provide a hot water storage type hot water supply device.

Means for Solving the Problems The present invention provides a hot water storage tank, a circulation pipe connected to the upper and lower portions of the hot water storage tank, a heating device provided in the middle of the circulation pipe for heating water, and a circulation pipe provided in the circulation pipe. A pump that pumps heated water in a direction from the lower part to the upper part of the hot water storage tank, an opening / closing valve provided upstream of the pump of the circulation pipe, and a circulation pipe connected between the opening / closing valve and the heating device. A water supply pipe that supplies water, a first temperature detector that detects the temperature of the upper part of the hot water storage tank, a second temperature detector that detects the temperature of the hot water storage tank below the first temperature detector, and a hot water storage tank In response to the hot water supply pipe connected to the upper part and the output of the first temperature detector, the open / close valve is opened when the detected temperature is equal to or higher than a predetermined first value, and the open / close valve is opened when the detected temperature is lower than the predetermined first value. Closed, in response to the output of the second temperature detector, the second value of the detected temperature that is predetermined To stop the pump above, is less than a second value detected temperature is predetermined to drive the pump, a hot water storage tank type water heater which comprises a control means for heating by connexion water heating device.

According to the present invention, when the temperature detected by the first temperature detector provided in the upper part of the hot water storage tank is equal to or higher than the predetermined first value, a temperature suitable for supplying hot water is provided in the upper part of the hot water storage tank. The hot water it has is stored, and in this state, a large amount of hot water can be supplied at one time. Therefore, the on-off valve is opened, and the hot water in the hot water storage tank is pushed out from the upper portion by the water from the water supply pipe for use. Water is supplied to the lower part of the hot water storage tank through the open / close valve.

When the temperature detected by the second temperature detector for detecting the temperature of the hot water storage tank below the first temperature detector is less than the second predetermined value due to the use of hot water in the hot water storage tank In the hot water storage tank, at least a portion below the position of the second temperature detector is filled with water. In this state, the pump is driven and hot water is supplied to the upper part of the hot water storage tank by a heating device such as an instantaneous water heater. Hot water heated by a heating device is used from the upper part of the hot water storage tank.

Further, when the temperature detected by the first temperature detector is less than the first value, the entire hot water storage tank is filled with water. In this state, the on-off valve is closed, the pump is driven, and only the hot water heated by the heating device is used. In this way, it becomes possible to continue supplying hot water of a desired temperature suitable for the heating device.

Embodiment FIG. 1 is a system diagram of an embodiment of the present invention. This hot water storage type hot water supply device has an airtight hot water storage tank 1. This hot water storage tank 1
The pipe 2 is connected to the lower part of the. An on-off valve 3 such as an electromagnetic valve is connected to the pipe 2, and a pipe 5 in which a pump 4 is interposed is connected to the pipe 2. The water from the pipe 5 is guided to and heated by the instantaneous water heater 6 as a heating device, and the hot water is connected from the pipe 7 to the connecting tube 8 in the upper part of the hot water storage tank 1. A baffle plate 9 is attached to the upper portion of the connecting tube 8. A hot water supply pipe 10 is connected to the connection tube 8, and the hot water supply pipe 10 has, for example, a faucet 11
Are connected. The tubes 2, 5, 7 form a circulation tube 12. The open / close valve 3 and the pump 4 have a water supply pipe through which tap water or the like is pumped.
13 is connected. The pump 4 includes an opening / closing valve 3 and a water supply pipe 13
The water from is sent under pressure to the instant water heater 6. The temperature of the hot water from the instantaneous water heater 6 is detected by the temperature detector TH interposed in the pipe 7.

In the instant water heater 6, the pipe 5 is provided with a flow detector 15 for detecting the flow of water, and when the flow detector 15 detects the flow of water, the on-off valve 16 is opened to open the gas. Fuel pipe 17
From this, gas fuel is supplied to the burner 18, and the gas burner 18 is ignited. The water from the tube 5 is thereby heated by the heat exchanger 19.

A check valve 22 is provided between the pipe 2 and the water supply pipe 13 so that water is not supplied from the water supply pipe 13 (water faucet).
Even when hot water is not supplied from 11), the water in the hot water storage tank 1 via the pipe 2 can be supplied from the pipe 5 to the instantaneous water heater 6 when the pump 4 is driven.

A first temperature detector TH3 is provided above the hot water storage tank 1. Further, the hot water storage tank 1 has a temperature detector for detecting the temperature of the hot water at intervals below the first temperature detector TH3.
TH1 and TH2 are provided respectively, and one of them functions as the second temperature detector.

FIG. 2 is a block diagram showing the electrical construction of the embodiment shown in FIG. Outputs from the temperature detectors TH, TH1, TH2, TH3 are given to a control circuit 24 realized by a microcomputer or the like, which controls the on-off valve 3 and the pump 4.

The operation will be described with reference to the flow chart of FIG.
When hot water is to be stored in the hot water storage tank 1 by about half of the amount of hot water stored in the hot water storage tank 1, TH1 acts as the second temperature detector. The control circuit 24 shifts from step n1 to step n2, and determines whether or not the temperature TH1 detected by the temperature detector TH1 is equal to or higher than a predetermined second value T1. At step n2, the temperature T detected by the temperature detector TH1
If H1 is greater than or equal to the predetermined value T1, it means that at least half the amount of hot water is stored in the hot water tank 1, and at this time, the pump 4 is stopped at step n3 and the hot water is stopped at step n4.
Then, the instant water heater 6 is at rest.

When the temperature TH1 detected by the temperature detector TH1 is less than the predetermined value T1, the process moves from step n2 to step n8, and the pump 4 is driven. In step n9, the flow detector 15 detects the flow of water, the hot water heater 6 obtains hot water as described above, and the hot water is led from the pipe 7 to the hot water tank 1. In step n5, if the temperature TH3 detected by the first temperature detector TH3 provided in the upper part of the hot water storage tank 1 is equal to or higher than the predetermined first value T2, the open / close valve 3 remains open in step n6. Up to. Therefore, when TH1 <T1 and TH3 ≧ T2, the water in the lower portion of the hot water tank 1 is pumped from the pump 4 to the pipe 5 through the pipe 2 and the opening / closing valve 3 by driving the pump 4. In this way, the water in the hot water storage tank 1 is circulated, and hot water is stored in the hot water storage tank 1 in a stratified manner such that the temperature becomes lower from the top to the bottom. The predetermined value T1 is slightly lower than T2 and is an approximate value, for example, 59 ° C and 60 ° C.
May be

Hot water is supplied from the hot water storage tank 1 by opening the faucet 11 provided in the hot water supply pipe 10. Pump 4 is stopped and open / close valve 3 is open (TH1 ≧ T1, TH3 ≧ T
In 2), the water from the water supply pipe 13 is supplied from the open on-off valve 3 to the hot water storage tank 1 via the pipe 2, and the hot water is supplied by the pressure of the water. The water from the water supply pipe 13 is stored in the hot water tank 1, and as a result, when the temperature TH1 detected by the temperature detector TH1 becomes less than a predetermined value T1, the pump 4 is driven again to circulate the water. Then, the hot water from the instant water heater 6 is supplied to the hot water storage tank 1.

When hot water having a large temporary flow rate that is greater than the capacity of the instantaneous water heater 6 is used by the faucet 11, if the temperature TH1 detected by the temperature detector TH1 is less than the predetermined value T1, The hot water obtained by the instantaneous water heater 6 and the hot water in the hot water storage tank 1 are supplied by driving the pump 4. As a result, when the hot water tank 1 is filled with water, the temperature detector TH
The temperature TH3 detected by 3 becomes less than the predetermined value T2. Therefore, at step n10, the on-off valve 3 is closed.
As a result, the water from the water supply pipe 13 is supplied from the pump 4 via the pipe 5 to the instant water heater 6 and heated. Hot water from the instantaneous water heater 6 is supplied from the pipe 7 to the connecting tube 8 on the upper part of the hot water tank 1,
It is guided to the faucet 11 via the hot water supply pipe 10.

The control circuit 24 changes the rotation speed of the pump 4 so that the temperature detected by the temperature detector TH interposed in the tube 7 becomes a predetermined first value T2. When the temperature detected by is low, the rotation speed of the pump 4 is set to a low speed, and thus the discharge flow rate is controlled to be small. In this way, from the faucet 11, hot water having a desired temperature commensurate with the capacity of the instant water heater 6 can be continuously supplied.

The control circuit 24 may operate in response to the temperature detector TH2 instead of operating in response to the temperature detector TH1, and may control the hot water storage tank 1 to store hot water of the entire amount stored. .

Instead of the instantaneous water heater 6, another heating device, such as an electric heater, may be used. Although the pump 4 is interposed between the on-off valve 3 and the instantaneous water heater 6 in the above-described embodiment, it may be interposed in the pipe 7 as another embodiment of the present invention.

Effect of the Invention According to the present invention as described above, a large amount of hot water can be supplied at a time when hot water having a temperature equal to or higher than a predetermined value is stored in the hot water storage tank. When the hot water storage tank is filled with water having a temperature lower than the predetermined value, the on-off valve is closed and the water from the water supply pipe is supplied to the heating device by the pump to pass from the hot water supply pipe through the upper part of the hot water storage tank. Hot water supply,
As a result, it becomes possible to continue supplying hot water at a desired temperature commensurate with the capacity of the heating device.

[Brief description of drawings]

FIG. 1 is an overall system diagram of an embodiment of the present invention, FIG. 2 is a block diagram showing an electrical configuration of the embodiment shown in FIG.
FIG. 3 is a flow chart for explaining the operation of the embodiment. 1 ... Hot water tank, 4 ... Pump, 6 ... Instant water heater, 10 ...
… Hot water supply pipe, 11 …… Faucet, 12 …… Circulation pipe, 13 …… Water supply pipe,
TH1, TH2 …… Second temperature detector, TH3 …… First temperature detector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiji Saito 3-3 Kanda Blacksmith Town, Chiyoda-ku, Tokyo Inside Tomoe Shokai Co., Ltd. (56) References JP-A-52-88841 (JP, A) JP-A-63 -65252 (JP, A) Actually developed 56-144218 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A hot water storage tank, a circulation pipe connected to the upper and lower portions of the hot water storage tank, a heating device provided in the middle of the circulation pipe for heating water, and a lower portion of the hot water storage tank provided in the circulation pipe. A pump that pumps heated water in the direction from the top to the top, an opening / closing valve provided upstream of the pump of the circulation pipe, and a water supply pipe that is connected to the circulation pipe between the opening / closing valve and the heating device and supplies water. A first temperature detector for detecting the temperature of the upper part of the hot water storage tank, a second temperature detector for detecting the temperature of the hot water storage tank below the first temperature detector, and a hot water supply connected to the upper part of the hot water storage tank In response to the output of the pipe and the first temperature detector, the open / close valve is opened when the detected temperature is equal to or higher than a predetermined first value, and the open / close valve is closed when the detected temperature is lower than the predetermined first value to detect the second temperature. In response to the output of the vessel, the pump is stopped when the detected temperature is equal to or higher than the predetermined second value, A hot water tank type hot water supply device comprising: a control means for driving a pump when the detected temperature is less than a second predetermined value and heating water by a heating device.