JP3127622B2 - Hot water storage type electric water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type electric water heater for storing hot water from an upper part of a hot water storage tank.

[0002]

2. Description of the Related Art Conventionally, this type of hot water storage type electric water heater is shown in FIG.
, A hot water storage tank 21, a circulation pump 22, a heater 2
3. It comprises a temperature detector 24 and a control unit 25. The temperature detector 2 detects the temperature of the hot water heated by the heater 23 so that the temperature of the hot water heated by the heater 23 becomes constant.
The control unit 25 controls the flow rate of the circulation pump 22 by the signal of No. 4 to store hot water from the upper part of the hot water storage tank 21.

[0003]

However, in the above configuration, (1) there is a problem in the reliability of the equipment due to the fact that the piping freezes during severe cold in winter. (2) Further, immediately after the start of operation, the heater 23
Since it has a heat capacity, it takes a little time to rise to a predetermined temperature. That is, the low-temperature water flows out of the heater 23, and the low-temperature water may flow into the hot water storage tank 21. Then, even if the heat capacity of the heater 23 becomes small, if the connecting pipe length between the heater 23 and the hot water storage tank 21 is long, low-temperature water in the pipe flows into the hot water storage tank 21.

An object of the present invention is to solve the above-mentioned conventional problems and to improve the reliability of equipment against freezing in winter and to stabilize the temperature of hot water in a hot water tank.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a hot water storage tank having a first connection pipe at a lower part and a hot water supply pipe at an upper part, a circulating pump, a heating source communicating therewith, An outgoing pipe connecting the first connection pipe and the circulation pump,
A return pipe connecting the hot water supply pipe and the heating source, a bypass pipe connecting the first connection pipe and the hot water supply pipe, and a function provided on the bypass pipe to close with a signal of a boiling temperature;
Alternatively, it comprises an on-off valve having at least one of a function of opening with a signal of an antifreezing temperature, and a control unit for controlling opening and closing of the circulation pump, the heating source and the on-off valve by the signal.

Further, the present invention provides a temperature detector for outputting at least one signal of a boiling temperature and an anti-freezing temperature, and an on-off valve is opened and circulated when a signal of the anti-freezing of the temperature detector is inputted. The control unit has at least one of control for operating a pump and a heating source, and control for closing an on-off valve when a signal of a boiling temperature is input.

[0007]

According to the present invention, the low-temperature water flowing out of the hot water storage tank flows into the heating source via the first connecting pipe, the outgoing pipe, and the circulation pump, and is heated. And
High-temperature water of a predetermined temperature flowing out of the heating source flows into the upper part of the hot water tank through the hot water supply pipe, and is stored from the upper part of the hot water tank along with the heating operation time. (1) After the stop of the boiling operation, the temperature of the water in the outgoing pipe and the return pipe gradually decreases during severe cold in winter. In particular, the water temperature in the outgoing pipe on the low-temperature water side becomes low, and there is a possibility of freezing. In this case, the control unit that has received the signal of the freezing prevention temperature opens the on-off valve and energizes the circulation pump and the heating source. Then, the water heated by the heating source passes through the return pipe and circulates in the system of the bypass pipe, the first connection pipe, the outward pipe, and the circulation pump.

(2) Immediately after the start of the operation of the equipment, the return pipe, the bypass pipe, the first connection pipe, the outgoing pipe, and the return pipe do not reach a predetermined temperature because the heating source has a heat capacity. Circulates the circulation pump, flows into the heating source again,
Heated. And it flows through the return pipe and the bypass pipe. At that time, the temperature detector detects whether or not a predetermined temperature has been reached. If the temperature has not reached the predetermined temperature, the above operation is repeated. If the temperature has reached the predetermined temperature, a signal is sent to the control unit to close the on-off valve. Therefore, high-temperature water of a predetermined temperature heated by the heating source flows into the hot water storage tank through the return pipe and the hot water supply pipe, and is stored.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a hot water tank, and 2 denotes a first connection pipe, which is connected to a lower portion of the hot water tank 1. 3 is a hot water supply pipe, which is connected to the upper part of the hot water storage tank 1.
Reference numeral 4 denotes a circulation pump, 5 denotes a heating source connected to and connected to the circulation pump, and 6 denotes a heat source device, in which the circulation pump 4 and the heating source 5 are housed. Reference numeral 7 denotes an outgoing pipe, which connects the first connection pipe 2 to the circulation pump 4. A return pipe 8 connects the hot water supply pipe 3 and the heating source 5. 9 is a bypass pipe, which connects the first connection pipe 2 and the hot water supply pipe 3. Reference numeral 10 denotes an on-off valve, which is provided in the bypass pipe 9. Reference numeral 11 denotes a temperature detector, which is provided in the bypass pipe 9 downstream of the on-off valve 10. A control unit 12 controls the circulating pump 4, the heating source 5, and the on-off valve 10 based on a signal from the temperature detector 11. That is, the temperature detector 11 has a first set value of a predetermined temperature which is a boiling temperature of hot water and a second set value of a predetermined temperature at which the outgoing pipe 7 may be frozen. When the control unit 12 enters, the control unit 12 closes the on-off valve 10 that has been opened, and when the signal of the second set value is input, energizes the circulation pump 4 and the heating source 5 together with the on-off valve 10 being opened. It is. In addition, 13 is a tapping pipe and 14 is a water supply pipe.

In the above configuration, when the operation is started, the low-temperature water in the hot water storage tank 1 is supplied to the first connection pipe 2 by the circulation pump 4.
, Flows into the heating source 5 via the circulation pump 4 and is heated. Then, the heated high-temperature water (however, hot water boiled to a predetermined temperature and the on-off valve 10 is closed) flows into the hot water storage tank 1 through the hot water supply pipe 3. While repeating this boiling operation, the hot water tank 1
We store hot water from the upper part of. Next, the state after the boiling operation is stopped will be described. During severe cold in winter, the hot water in which the outgoing pipe 7 and the return pipe 8 are stopped gradually releases heat and the temperature thereof decreases. In particular, the water temperature in the outgoing pipe 7 on the low-temperature water side becomes low, and there is a possibility of freezing. In this case, the control unit 12 receiving the signal (second set value) from the temperature detector 11 opens the on-off valve 10 and energizes the circulation pump 4 and the heating source 5. Then, the water heated by the heating source 5 passes through the return pipe 8 and circulates in the system of the bypass pipe 9, the first connection pipe 2, the outward pipe 7, and the circulation pump 4. Therefore, the reliability of the equipment against freezing is improved.

Next, the operation immediately after the start of the operation of the device will be described. Since the heating source 5 has a heat capacity, the hot water circulates through the return pipe 8, the bypass pipe 9, the first connection pipe 2, the forward pipe 7, and the circulation pump 4 without reaching a predetermined temperature, and is heated again. It flows into source 5 and is heated. Then, it flows through the return pipe 8 and the bypass pipe 9. At this time, the temperature detector 11 detects whether or not the temperature has reached a predetermined temperature. When the temperature has not reached the predetermined temperature, the above operation is repeated. If the temperature has reached the predetermined temperature, a signal is sent to the control unit 12 to close the on-off valve 10. Therefore, high-temperature water of a predetermined temperature heated by the heating source 5 flows through the return pipe 8 and the hot-water supply pipe 3, flows into the hot-water storage tank 1, and is stored.

FIG. 2 shows another embodiment of the present invention. Parts having the same structure and the same function as those of the above embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and different parts will be described. That is, this is the case where the heat source unit 6 is integrally mounted along the hot water storage tank 1. Also in this case, by making the heat source device 6 detachable, the same effect as in the above embodiment can be obtained.

[0014]

As described above, the hot water storage type electric water heater according to the present invention comprises: a hot water supply tank having a first connection pipe at a lower portion and a hot water supply pipe at an upper portion; a circulation pump; An outgoing pipe connecting the first connection pipe and the circulation pump,
A return pipe connecting the hot water supply pipe and the heating source, a bypass pipe connecting the first connection pipe and the hot water supply pipe, and a function provided on the bypass pipe to close with a signal of a boiling temperature;
Alternatively, it is provided with an opening / closing valve having at least one of a function to be opened by a signal of an antifreezing temperature, and a control unit for controlling opening / closing of the circulation pump, the heating source, and the opening / closing valve.

According to a second aspect of the present invention, there is provided a hot water storage tank having a first connecting pipe connected to a lower part and a hot water supply pipe connected to an upper part, a circulating pump, a heating source connected thereto, the first connecting pipe and the circulating pipe. An outgoing pipe connecting a pump, a return pipe connecting the hot water supply pipe and the heating source, a bypass pipe connecting the first connection pipe and the hot water pipe, and an on-off valve provided on the bypass pipe; A temperature detector that outputs at least one signal of a boiling temperature and an antifreezing temperature, and when a signal of antifreezing of the temperature detector is input, opens an on-off valve and operates a circulation pump and a heating source. A control unit having at least one of control and control for closing an on-off valve when a signal of a boiling temperature is input is provided.

Therefore, the following effects can be expected. (1) During severe cold in winter, the circulation pump and the heating source are energized by a signal from the temperature detector, the on-off valve is opened to circulate hot water, and the circulation pump, the heating source, the outgoing pipe, The temperature of water in the system of the bypass pipe and the return pipe is raised to improve the reliability of the equipment. (2) Immediately after the start of the operation of the equipment, the temperature detector detects that the temperature of the hot water to flow into the hot water storage tank has reached a predetermined temperature, and the high-temperature water flowing out of the heating source is supplied to the hot water supply pipe. Through the hot water storage tank. Therefore, the boiling water temperature of the hot water storage tank can be stabilized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electric water heater according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an electric water heater according to another embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional electric water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 First connection pipe 3 Hot water supply pipe 4 Circulation pump 5 Heat source 6 Heat source device 7 Outgoing pipe 8 Return pipe 9 Bypass pipe 10 Open / close valve 11 Temperature detector 12 Control unit 13 Hot water pipe 14 Water supply pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-123497 (JP, A) JP-A-61-194144 (JP, A) JP-A-58-158433 (JP, A) JP-A-51-194 11246 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24H 1/18 503

Claims (2)

(57) [Claims] 1. A hot water storage tank having a first connection pipe connected to a lower part and a hot water supply pipe connected to an upper part, a circulation pump, a heating source connected to the circulation pump,
An outgoing pipe connecting the first connection pipe to the circulation pump; a return pipe connecting the hot water supply pipe to the heating source; a bypass pipe connecting the first connection pipe to the hot water pipe; An on-off valve provided in a pipe and having at least one of a function of closing with a signal of a boiling temperature or a function of opening with a signal of an antifreezing temperature, and controlling opening and closing of the circulation pump, the heating source, and the on-off valve; Hot water storage type electric water heater with control unit. 2. A hot water storage tank having a first connection pipe connected to a lower part and a hot water supply pipe connected to an upper part, a circulation pump, and a heating source connected to the circulation pump.
An outgoing pipe connecting the first connection pipe to the circulation pump; a return pipe connecting the hot water supply pipe to the heating source; a bypass pipe connecting the first connection pipe to the hot water pipe; An on-off valve provided in the pipe, a temperature detector that outputs at least one signal of a boiling temperature or an anti-freezing temperature, and when an anti-freezing signal of the temperature detector is input, the on-off valve is opened, and A hot water storage type electric water heater comprising a control unit having at least one of control for operating a circulation pump and a heating source or control for closing an on-off valve when a signal of a boiling temperature is input.