JP3173204B2 - Heat pump 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 supply apparatus.

[0002]

2. Description of the Related Art Conventionally, as a heat pump type hot water supply apparatus of this kind, there is one disclosed in, for example, Japanese Utility Model Laid-Open No. 01-97147. FIG. 22 is a configuration diagram of a conventional heat pump hot water supply apparatus described in the above publication. As shown in the figure, the hot water supply apparatus has a plurality of hot water storage tanks 1a, 1b, and 1c arranged side by side.
a, 1b, and 1c have water supply ports 2a, 2b, and 2 at their lower ends.
c, and water supply ports 3a, 3b, 3c are formed at the upper end thereof, each of the water supply ports 2a, 2b, 2c is connected to the water supply pipe 4, and each of the water supply ports 3a, 3b, 3c is connected to the hot water supply pipe 5.
Connected to each other. In addition, each hot water storage tank 1a, 1
On / off valves 21a, 21b, 21c are connected to the water supply ports 2a, 2b, 2c of b, 1c, respectively. This is because the hot water stored in the hot water storage tank 1a connected to the selectively opened / closed valve 21a is supplied to the hot water supply pipe 5 when the callan (not shown) at the front end of the hot water supply pipe 5 is opened. It is for enabling hot water to be supplied in a push-up manner by the pressure of tap water acting through the pipe 4. Further, in a specific tank 1c of the hot water storage tanks 1a, 1b, 1c, an electric heater 25 that operates only at midnight is provided. On the other hand, in FIG.
This auxiliary tank has a smaller capacity than the auxiliary tanks a, 1b, and 1c. The auxiliary tank 6 is provided with a water intake port 7 and a water supply port 8 at the lower end side thereof. Is connected to a hot water supply heat exchanger 11 as a heating unit by a heat pump system by a heating forward pipe 9 and a heating return pipe 10, and a water circulation path between the auxiliary tank 6 and the hot water supply heat exchanger 11. Is configured. The hot water supply heat exchanger 11 functions as a condenser in a refrigeration cycle, and is connected to a compressor, an evaporator, a decompression mechanism, and the like (not shown) by a refrigerant pipe, thereby constituting a heat pump system. That is, when the refrigerant is circulated by operating the compressor, the refrigerant is condensed in the hot water supply heat exchanger 11, and the condensed heat is circulated in the hot water supply 11. A hot water supply port 12 formed on the upper side of the auxiliary tank 6
Are connected to the hot water supply pipe 5 by a hot water supply connection pipe 13. A multidirectional switching valve 14 and a circulating pump 15 are sequentially provided from the auxiliary tank 6 in the heating forward pipe 9, and the multidirectional switching valve 14 is further connected to the water supply connection pipe 1.
6 is connected to the water supply pipe 4. The multidirectional switching valve 14 switches the connection state to the pump 15 between the intake port 7 side of the auxiliary tank 6 and the water supply ports 2a, 2b, 2c of the hot water storage tanks 1a, 1b, 1c. Although not shown, each of the hot water storage tanks 1a, 1b, and 1c is provided with a total of four thermistors in the vertical direction, so that the temperature of the hot water can be detected for each water level by these thermistors. The auxiliary tank 6 is also provided with a thermistor for detecting the internal hot water temperature.

Next, the operation of the hot water supply apparatus having the above configuration will be described. First, the entire hot water storage tank 1a is, for example, 1
A description will be given of a heating operation when the temperature of the supply water is about 0 ° C. At this time, the operation of the pump 15 and the operation of the refrigeration cycle are started with the three-way switching valve 14 positioned at the water intake 7 side of the auxiliary tank 6. In this state, the water in the auxiliary tank 6 is sucked from the water intake port 7 by the action of the pump 15, sent to the heat exchanger 11 for hot water supply, heated, and further passed through the water supply port 8 from the return pipe 10 for heating. The circulation returned into 6 is continued. When the temperature of the hot water in the auxiliary tank 6 reaches the set temperature due to the continuation of this operation, that is, in the boiling process diagram shown in FIG.
4, the pump 15 is connected to the water supply port 2a of the hot water storage tank 1a.
Switch to the side connection state. As a result, the hot water storage tank 1a
The lower part of the water is sucked by the pump 15 and flows into the auxiliary tank 6 through the water supply port 8 of the auxiliary tank 6 through the heating forward pipe 9, the hot water supply heat exchanger 11, and the heating return pipe 10. By this inflow of the water, the hot water in the auxiliary tank 6 up to that point is pushed upward, and as shown in FIG. 21B, the hot water storage tank 1a passes through the hot water supply port 12 of the auxiliary tank 6 via the hot water supply connection pipe 13. Flows into the upper part of. By continuing this state for a predetermined time, as shown in FIG. 23 (c), the hot water heated to the set temperature in the auxiliary tank 6 is at the upper position of the hot water storage tank 1a, and at the same time, the lower part of the hot water storage tank 1a The water that was present on the side is the auxiliary tank 6
A displacement is performed, which is transferred into each of them. Then, after a lapse of time in anticipation of the completion of the replacement, the connection to the pump 15 is again switched to the water intake port 7 side of the auxiliary tank 6 by the three-way switching valve 14, so that the auxiliary tank 6 and the hot water supply heat exchanger 11 are connected. During this time, the circulation of water is performed, and the water in the auxiliary tank 6 is heated. During this heating, the hot water storage tank 1a
Inside, since the hot water of the set temperature is located on the upper side and the water of lower temperature is located on the lower side, it is possible to supply the hot water of the set temperature from the hot water supply pipe 5 at this stage. . FIG. 23 (d) shows a state in which the hot water in the auxiliary tank 6 has reached the set temperature again. In this state, by switching the three-way switching valve 14 in the same manner as described above, the hot water becomes As shown in (e), replacement is performed to be transferred to the upper side of the hot water storage tank 1a. This transferred hot water also presses down the previously heated hot water and is stored on the upper side thereof. After the above operation is repeated to fill the specific hot water storage tank 1a with hot water, the on-off valve 21a is closed, the next on-off valve 21b is opened, and the same operation as described above is performed on the next hot water storage tank 1b. Then, the hot water is supplied to the hot water storage tank 1c thereafter in the same manner as described above. On the other hand, in the hot water storage tank 1c provided with the electric heater 25, the low-temperature hot water (about 40 ° C.) supplied as described above is changed until the second set temperature (for example, 65 ° C.) becomes higher than that. It is heated by the electric heater 25.

[0004]

As described above, the conventional heat pump type hot water supply apparatus stores hot water by transferring the hot water boiled in the heating tank 6 to the hot water storage tanks 1a, 1b, 1c. In the daytime, such as when performing boiling operation using the exhaust heat of cooling, the amount of residual hot water decreases,
In the case of performing the boiling operation of the used tank, the conventional heat pump hot water supply device cannot perform the tapping operation while transferring the heated water heated by the heating tank to the hot water storage tank due to the circuit configuration. was there. Further, if the heating tank 6 becomes unusable due to corrosion or the like, there is a problem that the hot water supply operation cannot be performed at all.
Also, since only some tanks have heaters,
A tank without a heater cannot be heated to a high temperature, and if it is necessary to cover a case where the required amount of hot water is large, such as in winter, there is a problem that the required capacity of the tank becomes large. In addition, it is necessary to separately manufacture a tank containing a heater and a tank not containing a heater, and there is a problem that mass productivity is poor.

The present invention has been made in order to solve the above problems, and it is possible to continuously discharge hot water while performing a high-efficiency boiling operation utilizing daytime cooling and exhaust heat. Even if some tanks become unusable, the hot water supply function can be maintained by other tanks, it is possible to boil all or some tanks to high temperatures as necessary,
When the amount of remaining hot water is low, the used tank is boiled, and hot water can be discharged at the same time.
It is an object of the present invention to provide a space-saving heat pump water heater.

[0006]

A heat pump type hot water supply apparatus according to the present invention includes a heating unit provided with a heat pump system, a plurality of hot water storage tanks arranged in parallel with each other, and connecting the heating unit and each of the hot water storage tanks to the heating unit. A circulating system for circulating the water in each of the hot water storage tanks for boiling, a water supply system connected to a lower portion of each of the hot water storage tanks to supply water to the hot water storage tanks, and a hot water supply from the hot water storage tanks connected to the upper portions of the hot water storage tanks. A hot water supply system, a heating heater disposed in each of the hot water storage tanks for heating, and a switch between the hot water storage tanks disposed between the lower portion of the circulating system and the lower portion of the hot water storage tanks. A first multi-directional switching valve, and a second multi-directional switching valve disposed at a branch point of the water supply system branching to each of the hot water storage tanks and switching each of the hot water storage tanks, wherein the first multi-directional switching valve is provided. Switching valve One of the hot water storage tank which is opened with operating boiling up by switching, and performs the water supply and hot water operation other hot water storage tank which is opened by the switching of the second multi-way selector valve.

Further, a heat pump type hot water supply apparatus according to the present invention has a plurality of temperature detecting means disposed in each hot water storage tank for detecting the hot water temperature, and the hot water temperature of one hot water storage tank detected by the temperature detecting means. If the temperature of the hot water storage tank is lower than the set temperature, the hot water storage tank is boiled. In the following case, control means for boiling the hot water storage tank is provided.

Further, the heat pump type hot water supply apparatus according to the present invention has a plurality of temperature detecting means disposed in each hot water storage tank for detecting the temperature of the hot water, and the one hot water storage in the hot water detected by the temperature detecting means. When the temperature of the hot water at a predetermined location of the tank becomes equal to or lower than the set temperature, the control unit switches to hot water from another hot water storage tank to prevent running out of hot water.

Further, a heat pump type hot water supply apparatus according to the present invention is provided with an outside air temperature detecting means arranged near the outside of the hot water storage tank to detect an outside air temperature, and a near outside of the hot water storage tank detected by the outside air temperature detecting means. When the outside air temperature is equal to or lower than the first set temperature, all the hot water storage tanks are heated by the heater after the heat pump is boiled, and when the outside air temperature is equal to or higher than the second set temperature, only the heat pump is used for boiling. When the outside air temperature is equal to or higher than the first set temperature and equal to or lower than the second set temperature, control means is provided for heating all of the hot water storage tanks with a heat pump and then heating some of the oil storage tanks with a heater.

[0010]

In the heat pump type hot water supply apparatus according to the present invention, the hot water storage tank is switched by a water supply system multi-directional switching valve connected to the lower part of the hot water storage tank to supply water, and heated and boiled by the circulating system multi-directional switching valve. Switch to the hot water storage tank, circulate water in the heating section to boil, and if necessary, further heat by the heater for heating arranged in each hot water storage tank and discharge hot water from the hot water supply system connected to the upper part of the hot water storage tank .

Further, the heat pump type hot water supply apparatus according to the present invention is arranged such that the hot water temperature of one hot water storage tank detected by a plurality of temperature detecting means arranged inside each hot water storage tank is equal to or lower than a set temperature. The hot water storage tank is boiled, and if the temperature of the hot water storage tank is higher than the set temperature, the hot water storage tank is switched to another hot water storage tank. Automatically boil the tank.

Further, the heat pump type hot water supply apparatus according to the present invention is characterized in that the hot water at a predetermined location in one hot water storage tank during hot water detection detected by a plurality of temperature detecting means for detecting the temperature of the hot water disposed inside each hot water storage tank. When the temperature falls below the set temperature, the hot water is automatically switched to hot water from another hot water storage tank to prevent running out of hot water.

Further, in the heat pump type hot water supply apparatus according to the present invention, the outside air temperature near the outside of the hot water tank detected by the outside air temperature detecting means arranged near the outside of the hot water storage tank for detecting the outside air temperature is set to the first setting. If the temperature is equal to or less than the temperature, all the hot water storage tanks are heated by the electric heater after the heat pump boils, and if the outside air temperature is equal to or higher than the second set temperature, the heat is heated only by the heat pump and the outside air temperature is set to the first set temperature. When the temperature is equal to or more than the temperature and equal to or less than the second set temperature, after all the hot water storage tanks are heated by the heat pump, some of the hot water storage tanks are automatically heated by the electric heater.

[0014]

【Example】

Embodiment 1 FIG. FIG. 1 shows the configuration of the first embodiment. In the figure,
1a, 1b are hot water storage tanks, 2a, 2b are water supply ports from hot water supply to hot water storage tanks 1a, 1b, 3a, 3b are hot water storage tanks 1.
a, 1b hot water supply ports, 4 is a water supply pipe, 5 is a hot water supply pipe, 7
a and 7b are intakes of hot water storage tanks 1a and 1b, 8a and 8b
Is a circulating hot water supply port from the pump 15 to the hot water storage tanks 1a and 1b, 9 is a forward pipe for heating, 10 is a return pipe for heating, 11 is a heat exchanger for hot water supply which is a heating unit, 14a and 14b are multidirectional switching valves, 15 is a circulation pump, 17a and 17b are hot water storage tanks 1
a, 1b are drainage outlets, 18a, 18b are drainage valves, 25a,
25b is an electric heater.

Next, the operation will be described. The heat pump water heater of the present invention has six operation modes,
The operation of each operation mode will be described below. (1) Boiling operation of hot water storage tank 1a Description will be given with reference to FIG. During the boiling operation of the hot water storage tank 1a, the multidirectional switching valve 14a is switched to the hot water storage tank 1a side, and the multidirectional switching valve 14b is switched to the hot water storage tank 1b side,
The drain valves 18a and 18b are closed. The water taken from the water inlet 7a at the lower part of the hot water storage tank 1a is circulated through the multi-way switching valve 14a, the pump 15 and the hot water supply heat exchanger 11 by the pump 15, and from the circulating hot water supply port 8a at the upper part of the hot water storage tank 1a. It enters the hot water storage tank 1a again.

(2) Boiling operation of hot water storage tank 1b This will be described with reference to FIG. During the boiling operation of the hot water storage tank 1b, the multi-way switching valve 14a is switched to the hot water storage tank 1b side, and the multi-directional switching valve 14b is switched to the hot water storage tank 1a side,
The drain valves 18a and 18b are closed. The water taken from the water intake 7b at the lower part of the hot water storage tank 1b circulates through the multi-way switching valve 14a, the pump 15 and the hot water supply heat exchanger 11 by the pump 15, and from the circulation hot water supply port 8b at the upper part of the hot water storage tank 1b. It enters the hot water storage tank 1b again.

(3) Hot Water Storage Tank 1a Hot Water Driving Operation A description will be given with reference to FIG. During hot water storage tank 1a tapping operation, the multi-way switching valve 14a is switched to the hot water storage tank 1b side,
The multi-way switching valve 14b is switched to the hot water storage tank 1a side, the drain valves 18a, 18b are closed, and the pump 15 is stopped. City water that has entered by water pressure from the water supply pipe 4 connected to the water supply pipe enters the water supply port 2a at the lower part of the hot water storage tank 1a through the multi-way switching valve 14b, and the heated hot water in the hot water storage tank 1a is stored in the hot water storage tank. Hot water supply port 3 at the top of 1a
The hot water is discharged from the hot water supply pipe 5 by being pushed out from a.

(4) Hot water tapping operation of hot water storage tank 1b This will be described with reference to FIG. During the hot-water storage tank 1b tapping operation, the multidirectional switching valve 14a is switched to the hot-water storage tank 1a side,
The multi-way switching valve 14b is switched to the hot water storage tank 1b side, the drain valves 18a and 18b are closed, and the pump 15 is stopped. City water that has entered by water pressure from the water supply pipe 4 connected to the water supply pipe enters the water supply port 2b at the lower part of the hot water storage tank 1b through the multi-way switching valve 14b, and the heated hot water in the hot water storage tank 1b is stored in the hot water storage tank. Hot water supply port 3 at the top of 1b
Hot water is supplied from the hot water supply pipe 5 by being pushed out from the hot water supply pipe b.

(5) Simultaneous boiling of hot water storage tank 1a and simultaneous operation of hot water storage tank 1b will be described with reference to FIG. During the boiling operation of the hot water storage tank 1a, the multi-directional switching valve 14a is switched to the hot water storage tank 1a side, and the multi-directional switching valve 14b is switched to the hot water storage tank 1b side,
The drain valves 18a and 18b are closed. The water taken from the water inlet 7a at the lower part of the hot water storage tank 1a is circulated through the multi-way switching valve 14a, the pump 15 and the hot water supply heat exchanger 11 by the pump 15, and from the circulating hot water supply port 8a at the upper part of the hot water storage tank 1a. It enters the hot water storage tank 1a again. On the other hand, city water that has entered by water pressure from the water supply pipe 4 connected to the water supply pipe passes through the multi-way switching valve 14b and is stored in the hot water storage tank 1b.
The hot water in the hot water storage tank 1b is pushed out from the hot water supply port 3b in the upper part of the hot water storage tank 1b, so that hot water is discharged from the hot water supply pipe 5.

(6) Simultaneous operation of boiling of hot water storage tank 1b and hot water storage tank 1a will be described with reference to FIG. During the boiling operation of the hot water storage tank 1b, the multidirectional switching valve 14a is switched to the hot water storage tank 1b side, and the multidirectional switching valve 14b is switched to the hot water storage tank 1a side,
The drain valves 18a and 18b are closed. Water taken from a water inlet 7b at a lower portion of the hot water storage tank 1b is circulated through a multi-way switching valve 14a, a pump 15, and a hot water supply heat exchanger 11 by a hot water storage pump 15, and a circulating hot water supply port 8b at an upper portion of the hot water storage tank 1b. Then, the water enters the hot water storage tank 1b again. On the other hand, city water that has entered by water pressure from the water supply pipe 4 connected to the water supply pipe enters the water supply port 2a at the lower part of the hot water storage tank 1a through the multi-way switching valve 14b, and removes the hot water in the hot water storage tank 1a. Hot water is supplied from the hot water supply pipe 5 by being pushed out from the hot water supply port 3a at the upper part of the hot water storage tank 1a.

When the water in the hot water storage tank is discarded for maintenance or the like, the drain valves 18a and 18b are opened. In addition, in all boiling operations, when the required amount of hot water supply is large, such as in winter or in the interim period other than winter and summer, after the heat pump hot water supply operation, some or all of the hot water storage tanks are required depending on the required amount of hot water supply. , Electric heater 25
a, 25b to cover the required hot water supply heat.

As described above, in the present embodiment, it is possible to continuously discharge water from the hot water storage tank at the same time while continuously performing the boiling operation by the heat pump utilizing the cooling exhaust heat in the daytime. Efficient hot water supply operation can be performed without the need to replace hot water, and each hot water storage tank has an independent configuration, so even if some hot water storage tanks become unusable due to corrosion, other hot water storage tanks can be used. The hot water supply function can be maintained by the tank, and high reliability can be obtained. In addition, since the boiling temperature of all the hot water storage tanks can be set freely according to the required amount of hot water by the electric heater provided in each hot water storage tank, when the required hot water supply amount is large as in winter, all the hot water storage tanks are heated to a high temperature. It is possible to reduce the required capacity of the hot water storage tank and make it compact. Also, if the required hot water supply is relatively small, such as in spring and autumn,
Only some of the hot water storage tanks are heated at a high temperature by an electric heater, and the other hot water storage tanks can be used as low-temperature hot water depending on the application. In addition, since all tanks have the same structure, there is an effect that mass productivity is good.

Embodiment 2 FIG. FIG. 8 shows the configuration of another embodiment. In the figure, 1a and 1b are hot water storage tanks, 9 is a forward pipe for heating, 10 is a return pipe for heating, 11 is a heat exchanger for hot water supply, 14
a and 14b are multi-directional switching valves, 15 is a circulating pump, 17
a, 17b are drainage ports of hot water storage tanks 1a, 1b, 18a,
18b is a drain valve, 19a and 19b are hot water storage tanks 1a and 1
b is a water supply port, 20a and 20b are hot water supply tanks 1a and 1b, and 25a and 25b are electric heaters.

Next, the operation will be described. The heat pump water heater of the present invention has six operation modes,
The operation of each operation mode will be described below. (1) Hot Water Storage Tank 1a Boiling Operation A description will be given with reference to FIG. During the boiling operation of the hot water storage tank 1a, the multidirectional switching valve 14a is switched to the hot water storage tank 1a side, and the multidirectional switching valve 14b is switched to the hot water storage tank 1b side,
The drain valves 18a and 18b are closed. The water taken from the water inlet 19a at the lower part of the hot water storage tank 1a is circulated through the multi-way switching valve 14a, the pump 15 and the hot water supply heat exchanger 11 by the pump 15, and is again returned from the hot water supply opening 20a at the upper part of the hot water storage tank 1a. It enters hot water storage tank 1a.

(2) Boiling operation of hot water storage tank 1b This will be described with reference to FIG. During the boiling operation of the hot water storage tank 1b, the multi-way switching valve 14a is switched to the hot water storage tank 1b side, and the multi-directional switching valve 14b is switched to the hot water storage tank 1a side,
The drain valves 18a and 18b are closed. The water taken from the water inlet 19b at the lower part of the hot water storage tank 1b is circulated by the pump 15 through the multi-way switching valve 14a, the pump 15, and the heat exchanger 11 for hot water supply, and again from the hot water inlet 20b at the upper part of the hot water storage tank 1b. It enters hot water storage tank 1b.

(3) Hot Water Storage Tank 1a Hot Water Driving Operation This will be described with reference to FIG. At the time of hot water storage tank 1a tapping operation, the multidirectional switching valve 14a is switched to the hot water storage tank 1b side, and the multidirectional switching valve 14b is switched to the hot water storage tank 1a side,
The drain valves 18a and 18b are closed, and the pump 15 is stopped. City water that has entered by the water pressure from the water supply pipe 4 connected to the water supply pipe enters the water supply port 19a at the lower part of the hot water storage tank 1a through the multi-way switching valve 14b, and the heated hot water in the hot water storage tank 1a is stored in the hot water storage tank. Hot water is supplied from the hot water supply pipe 5 by being pushed out from the hot water supply port 20a at the upper part of 1a.

(4) Hot-water storage tank 1b hot-water tapping operation This will be described with reference to FIG. During the hot-water storage tank 1b hot-water discharge operation, the multi-directional switching valve 14a is switched to the hot-water storage tank 1a side, and the multi-directional switching valve 14b is switched to the hot-water storage tank 1b side.
The drain valves 18a and 18b are closed, and the pump 15 is stopped. City water that has entered by water pressure from the water supply pipe 4 connected to the water supply pipe enters the water supply port 19b at the lower part of the hot water storage tank 1b through the multi-way switching valve 14b, and the heated hot water in the hot water storage tank 1b is stored in the hot water storage tank. Hot water is supplied from the hot water supply pipe 5 by being pushed out from the hot water supply port 20b at the upper part of 1b.

(5) Simultaneous boiling of hot water storage tank 1a and hot water storage tank 1b operation will be described with reference to FIG. During the boiling operation of the hot water storage tank 1a, the multidirectional switching valve 14a is switched to the hot water storage tank 1a side, the multidirectional switching valve 14b is switched to the hot water storage tank 1b side, and the drain valves 18a and 18b are closed. The water taken from the water inlet 19a at the lower part of the hot water storage tank 1a is supplied by the pump 15 to the multi-directional switching valve 14a, the pump 1
5. Circulate through the hot water supply heat exchanger 11 and re-enter the hot water storage tank 1a through the hot water supply port 20a at the top of the hot water storage tank 1a. On the other hand, city water that has entered by water pressure from the water supply pipe 4 connected to the water supply pipe enters the water supply port 19b at the lower part of the hot water storage tank 1b through the multi-way switching valve 14b, and removes the hot water in the hot water storage tank 1b. Hot water is supplied from the hot water supply pipe 5 by being pushed out from the hot water supply port 20b at the upper part of the hot water storage tank 1b.

(6) Simultaneous Boiling of Hot Water Storage Tank 1b and Simultaneous Operation of Hot Water from Hot Water Storage Tank 1a Explanation will be given with reference to FIG. During the boiling operation of the hot water storage tank 1b, the multi-way switching valve 14a is switched to the hot water storage tank 1b side, the multi-directional switching valve 14b is switched to the hot water storage tank 1a side, and the drain valves 18a and 18b are closed. Water taken from a water inlet 19b at the lower part of the hot water storage tank 1b is circulated through a multi-way switching valve 14a, a pump 15, and a hot water supply heat exchanger 11 by a hot water storage pump 15, and from a hot water supply opening 20b at an upper part of the hot water storage tank 1b. It enters the hot water storage tank 1b again. On the other hand, city water that has entered by water pressure from the water supply pipe 4 connected to the water supply pipe enters the water supply port 19a at the lower part of the hot water storage tank 1a through the multi-way switching valve 14b, and removes the hot water in the hot water storage tank 1a. Hot water is supplied from the hot water supply pipe 5 by being pushed out from the hot water supply port 20a at the upper part of the hot water storage tank 1a. When the water in the hot water storage tank is discarded for maintenance or the like, the drain valves 18a and 18b are opened.

In all the boiling operations, such as in winter, when a large amount of hot water is required, such as in winter, after the heat pump hot water supply operation, some or all of the hot water storage tanks are replaced with electric heaters 25a in accordance with the required amount of hot water. , 25b to cover the required amount of hot water supply.

As described above, in the present embodiment, the number of pipes drawn from the tank can be reduced by using the water supply port from the water supply and the pump as the water intake and the water supply from the pump as the water supply. There is an effect that it is possible and mass production is good, and in addition, it has the same effect as the first embodiment.

Embodiment 3 FIG. FIG. 15 shows the configuration of another embodiment. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and a detailed description thereof will be omitted. 26a, 26b, 2
6c is a thermistor for detecting the hot water temperature of the hot water storage tank 1a, 26
Reference numerals d, 26e, and 26f denote thermistors for detecting the temperature of the hot water in the hot water storage tank 1b, and are constituted by microcomputers (not shown) that control the boiling and hot water supply of the hot water storage tank based on the temperature detected by the thermistor. .

Next, the operation will be described with reference to FIGS. FIG. 16 is a flowchart showing a control procedure by the microcomputer, and FIG. 17 shows an operation state of the hot water storage tank. In FIG. 16, hot water supply temperature T _S is set in step ST50, and in step ST51, if the temperature of hot water storage tank 1a is lower than set temperature T _S , the flow proceeds to step ST51, and hot water storage tank 1a cannot be discharged. Is performed in step ST5.
Return to 1. If the temperature of the hot water storage tank 1a is equal to or higher than the set temperature T _{S in} step ST51, the process proceeds to step ST53,
Hot water storage tank 1a is ready for hot water supply. At this point, the mode is switched to hot water storage tank 1b. If the temperature of hot water storage tank 1b is lower than set temperature T _S in step ST54, the flow proceeds to step ST55. The boiling operation of hot water storage tank 1b is performed, and step ST
Return to 54. In step ST54, if the temperature of the hot water storage tank 1b is equal to or higher than the set temperature T _S , the process proceeds to step ST57, in which the hot water storage tank 1b is ready for tapping, and at this time, the hot water storage tank 1a is switched to return to step ST51. In the hot water supply operation, when the hot water is being supplied from the hot water storage tank 1a, the temperature at a predetermined location of the hot water storage tank 1a is set to the set temperature T _S.
Then, it is detected that the amount of remaining hot water has decreased, and the hot water is switched to the hot water storage tank 1b to continuously discharge hot water.

FIG. 17 shows the operation of the hot water storage tank under the above control. The boiling operation is performed from the hot water storage tank 1a as shown in FIG.
When it is detected by 6b and 26c that the temperature of the hot water in the hot water storage tank 1a has reached the set temperature T _S , the boiling operation is switched to the hot water storage tank 1b as shown in FIG. When the thermistors 26d, 26e and 26f in the hot water storage tank 1b detect that the temperature of the hot water in the hot water storage tank 1b has reached the set temperature T _S , the boiling operation is terminated and the mode is switched to the hot water storage tank 1a. Next, the tapping operation is performed from the hot water storage tank 1a as shown in FIG. 17 (c), and the thermistors 26a, 26b, 26
c, the hot water storage tank 1
If it is detected that the amount of remaining hot water in a has decreased,
As shown in (d), the tapping operation is switched to the hot water storage tank 1b. Thermistors 26d, 26e, 2 in hot water storage tank 1b
6f, when it is detected that the amount of remaining hot water in the hot water storage tank 1b is smaller than a certain amount, the boiling operation of the hot water storage tank 1a is performed as shown in FIG. Since the heat pump system can continuously boil, the hot water storage tanks 1a and 1b can be alternately and continuously boiled to prevent running out of hot water.

Embodiment 4 FIG. In the present embodiment, as shown in the first embodiment, the boiling operation by the heating heat exchanger 11 and the electric heaters 25a and 25b shown in FIG. 1 is performed in accordance with the required hot water supply heat amount in winter, summer and other seasons. It is possible to automatically control the seasonal boiling operation by an outside air temperature detecting thermistor (not shown) for detecting outside air near the tank and a microcomputer (not shown),
This will be described with reference to the flowchart of FIG. In the figure,
In step ST60, the set outside air temperature T _S1 in winter and the set outside air temperature T _S2 in summer are input. Step ST61 to measure the outside air temperature T _out in, the process proceeds to step ST62, the outside air temperature T _out is, is less than the winter setting the outside air temperature T _S1, will winter required hot water supply heat large proceeds to step ST63, the process proceeds to step ST64 Then, both the hot water storage tanks 1a and 1b are heated to a high temperature by a heat pump and an electric heater. If the outside air temperature T _out is equal to or higher than the set outside air temperature T _{S1 in} winter in step ST62, the process proceeds to step ST65,
If the outside air temperature T _out exceeds the set outside air temperature T _S2 in the summer, the process proceeds to step ST66 and the required hot water supply heat amount in the summer is reduced, and the process proceeds to step ST67 to boil both the hot water storage tanks 1a and 1b using only the heat pump. . If the outside air temperature T _out is below summer set outside air temperature T _S2 at step ST65 proceeds to step ST 68, becomes in need hot water supply heat in winter and interim non summer, the process proceeds to step ST69, the hot water storage tank 1a, 1b any One of them is heated by a heat pump and an electric heater, and the other hot water storage tank is heated only by a heat pump.

Since the boiling is controlled as described above, all the hot water storage tanks can be automatically heated to a high temperature when the required hot water supply amount is large, such as in winter, and the intermediate period other than winter and summer can be achieved. When the required hot water supply amount is relatively small, only a part of the hot water storage tanks can be automatically heated to a high temperature by an electric heater, and the other hot water storage tanks can be used as low-temperature hot water depending on the application. When the required hot water supply heat is large, all the tanks are heated to a high temperature by the heater, so that the required capacity of the tanks can be reduced and the tanks can be made compact.

Embodiment 5 FIG. FIG. 19A and FIG.
This will be described with reference to FIG. FIG. 19A shows the configuration of the fifth embodiment, and FIG. 19B shows a partial plan view. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and a detailed description thereof will be omitted. 27 is a perforated partition plate provided in the middle of the hot water storage tank.

Next, the operation will be described with reference to FIG.
In this embodiment, the boiling operation of the hot water storage tank 1a and the simultaneous operation of tapping out of the hot water storage tank 1a are performed. First, the multidirectional switching valve 14 is set to the hot water storage tank 1a side, the multidirectional switching valve 14b is set to the hot water storage tank 1b side, and the drain valve 18a. , 18b are closed. Water taken from the water intake 7a at the lower part of the hot water storage tank 1a is circulated by the pump 15 through the multi-way switching valve 14a, the pump 15, and the hot water supply heat exchanger 11, and the water supply 8a on the hot water storage tank 1a.
Then, the water enters the hot water storage tank 1a again. After the circulation is performed several times and the water is boiled, the multi-way switching valve 14b is switched to the hot water storage tank 1a side, so that city water that has entered by the water supply pressure from the water supply pipe 4 connected to the water supply pipe is subjected to the multi-way switching valve. Water supply port 2a at the bottom of hot water storage tank 1a through 14b
The hot water in the hot water storage tank 1a is pushed up, pushed out from the hot water supply port 3a at the top of the hot water storage tank 1a, and the hot water is discharged from the hot water supply pipe 5. The partition plate 27 acts so that water entering from the water supply port 2a at the lower part of the hot water storage tank does not flow from the water supply port 3a at the upper part.

As described above, in the present embodiment, hot water can be simultaneously discharged from the same hot water storage tank while the boiling operation is being performed, and an efficient hot water supply operation can be performed.

Embodiment 6 FIG. Although the first embodiment shows the case where there are two hot water storage tanks, the present embodiment shows a case where there are three hot water storage tanks, and FIG. 21 shows the configuration. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts, and a detailed description thereof will be omitted. 1c is a hot water storage tank, 2c is a water supply port from the tap water to the hot water storage tank, 3c is a hot water supply port of the hot water storage tank 1c, 7c is a water intake port of the hot water storage tank 1c, 8c is a hot water supply port from the pump from the pump 15 to the hot water storage tank 1c, 17c is hot water storage tank 1
A drain port c, a drain valve 18c, and an electric heater 25c.

Next, the operation will be described. Hot water storage tank 1
c, the multi-way switching valve 14a is connected to the hot water storage tank 1
c side, the multi-way switching valve 14b is switched to the hot water storage tank 1a side or 1b side, and the drain valves 18a, 18b and 18c
Is closed. The water taken from the water inlet 7c at the lower part of the hot water storage tank 1c is circulated by the pump 15 through the multi-directional switching valve 14a, the pump 15 and the hot water supply heat exchanger 11, and is circulated by the circulating hot water supply port 8c at the upper part of the hot water storage tank 1c. It enters the hot water storage tank 1c again.

The tapping operation of the hot water storage tank 1c switches the multi-way switching valve 14a to the hot water storage tank 1a or 1b side, switches the multi-way switching valve 14b to the hot water storage tank 1c side, and sets the drain valve 1
8a, 18b and 18c are closed, and the pump 15 is stopped. City water that has entered the water supply pipe 4 connected to the water supply pipe due to tap water pressure enters the water supply port 2c at the lower part of the hot water storage tank 1c through the multi-way switching valve 14b, and the tank 1c
The hot water in the inside is pushed up and pushed out from the hot water supply port 3c at the upper part of the hot water storage tank 1c, so that hot water is discharged from the hot water supply pipe 5.

The tapping operation performed at the same time as the boiling operation can be performed simultaneously with the boiling operation of the hot water storage tank 1a and the simultaneous operation of the hot water storage tank 1b and the hot water storage tank 1b in the first embodiment. Simultaneous operation of boiling water and hot water storage tank 1c, simultaneous operation of boiling hot water storage tank 1b and simultaneous operation of hot water storage tank 1c, simultaneous operation of boiling hot water storage tank 1c and simultaneous operation of hot water storage tank 1b, simultaneous boiling of hot water storage tank 1c and simultaneous operation of hot water storage tank 1a. Operation is possible by the same operation as in the first embodiment.

As described above, in the present embodiment, since the number of hot water storage tanks is larger than that in the first embodiment, the hot water storage capacity is increased, a large amount of hot water can be supplied, and the hot water can be continuously boiled and simultaneously hot water can be continuously discharged.

[0045]

The heat pump type hot water supply apparatus according to the present invention comprises a circulating system for connecting a heating unit of the heat pump system and each hot water storage tank, circulating water in each of the hot water storage tanks to the heating unit and boiling the water, and a lower part of each hot water storage tank. A water supply system for supplying water to the hot water storage tank connected to the hot water storage tank, a hot water supply system for supplying hot water from the hot water storage tank connected to the top of each hot water storage tank, a heating heater for heating provided in each hot water storage tank, and a circulation system A first multi-way switching valve for switching between the heating unit and each hot water storage tank;
A second multi-directional switching valve for switching a water supply system to each hot water storage tank, wherein one of the hot water storage tanks opened by switching the first multi-directional switching valve is operated to be boiled, and the second multi-directional switching valve is operated. Since the other hot water storage tank opened by switching the directional control valve is supplied with water and supplied with hot water, it is possible to perform continuous hot water supply while performing continuous boiling operation, thereby enabling efficient hot water supply operation. Even if some hot water storage tanks become unusable, the hot water supply function can be maintained by other hot water storage tanks, and high reliability can be obtained.

Further, the heat pump type hot water supply apparatus according to the present invention has a plurality of temperature detecting means arranged in each hot water storage tank for detecting the hot water temperature, and the hot water temperature of one hot water storage tank detected by the temperature detecting means. If the temperature of the hot water storage tank is lower than the set temperature, the hot water storage tank is boiled. In the following case, when the hot water temperature of a predetermined location of one hot water storage tank during the hot water detected by the control means for boiling the hot water storage tank and the temperature detection means becomes equal to or lower than the set temperature, the other hot water storage tank The control means for preventing running out of hot water is provided by switching to hot water, so that hot water can be automatically and continuously discharged simultaneously with continuous boiling operation, and running out of hot water can be prevented.

Further, the heat pump type hot water supply apparatus according to the present invention is provided with an outside air temperature detecting means provided near the outside of the hot water storage tank for detecting the outside air temperature and a heating control means. After boiling, all the hot water storage tanks are heated by an electric heater, or only a heat pump is used for heating, and after all the hot water storage tanks are heated by a heat pump, some hot water storage tanks are automatically heated by an electric heater. The hot water supply operation can be performed efficiently according to the required hot water supply heat quantity.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a heat pump type hot water supply apparatus showing one embodiment of the present invention.

FIG. 2 is a system diagram of a hot water supply circuit showing a boiling operation of a hot water storage tank 1a in the heat pump hot water supply apparatus according to one embodiment of the present invention.

FIG. 3 is a system diagram of a hot water supply circuit showing a boiling operation of a hot water storage tank 1b in the heat pump hot water supply apparatus according to one embodiment of the present invention.

FIG. 4 is a system diagram of a hot water supply circuit showing a tapping operation of a hot water storage tank 1a in the heat pump hot water supply apparatus according to one embodiment of the present invention.

FIG. 5 is a system diagram of a hot water supply circuit showing a hot water discharge operation of a hot water storage tank 1b in the heat pump hot water supply apparatus according to one embodiment of the present invention.

FIG. 6 is a system diagram of a hot water supply circuit showing simultaneous operation of boiling hot water storage tank 1a and hot water storage tank 1b in the heat pump type hot water supply apparatus of one embodiment of the present invention.

FIG. 7 is a system diagram of a hot water supply circuit showing simultaneous operation of boiling the hot water storage tank 1b and tapping the hot water storage tank 1a in the heat pump hot water supply apparatus according to one embodiment of the present invention.

FIG. 8 is a configuration diagram of a heat pump type hot water supply apparatus showing another embodiment of the present invention.

FIG. 9 is a system diagram of a hot water supply circuit showing a boiling operation of a hot water storage tank 1a in a heat pump hot water supply apparatus according to another embodiment of the present invention.

FIG. 10 is a system diagram of a hot water supply circuit showing a boiling operation of a hot water storage tank 1b in a heat pump hot water supply apparatus according to another embodiment of the present invention.

FIG. 11 is a system diagram of a hot water supply circuit showing a hot water supply operation of hot water storage tank 1a in a heat pump hot water supply apparatus according to another embodiment of the present invention.

FIG. 12 is a system diagram of a hot water supply circuit showing a hot water supply operation of a hot water storage tank 1b in a heat pump hot water supply apparatus according to another embodiment of the present invention.

FIG. 13 shows a heat pump type hot water supply apparatus according to another embodiment of the present invention, in which the hot water storage tank 1a is heated and the hot water storage tank 1 is heated.
b is a system diagram of a hot water supply circuit showing simultaneous operation of hot water supply.

FIG. 14 is a view showing a heat pump type hot water supply apparatus according to another embodiment of the present invention.
It is a system diagram of the hot-water supply circuit which shows a simultaneous hot-water supply operation.

FIG. 15 is a configuration diagram of a heat pump type hot water supply apparatus showing another embodiment of the present invention.

FIG. 16 is a flowchart illustrating control according to another embodiment of the present invention.

FIG. 17 is an explanatory diagram showing an operation state in a heat pump hot water supply apparatus according to another embodiment of the present invention.

FIG. 18 is a flowchart illustrating control according to another embodiment of the present invention.

FIG. 19 (a) is a configuration diagram of a heat pump type hot water supply apparatus showing another embodiment of the present invention. (B) is a partial plan view showing another embodiment of the present invention.

FIG. 20 shows a heat pump type hot water supply apparatus according to another embodiment of the present invention, in which the hot water storage tank 1a is heated and the hot water storage tank 1 is heated.
It is a system diagram of the hot-water supply circuit which shows a simultaneous hot-water supply operation.

FIG. 21 is a configuration diagram of a heat pump hot water supply apparatus showing another embodiment of the present invention.

FIG. 22 is a system diagram of a conventional heat pump water heater.

FIG. 23 is an explanatory view showing a boiling step of a conventional heat pump water heater.

[Explanation of symbols]

 1a, 1b Hot water storage tanks 2a, 2b Water supply ports 3a, 3b Water supply ports 4 Water supply pipes 5 Hot water supply pipes 7a, 7b Water intake ports 8a, 8b Circulating water supply ports 9 Outgoing pipe for heating 10 Heating pipe for heating 11 Heat exchange for hot water supply 14a, 14b Multi-directional switching valve 15 Circulating pump 17a, 17b Drainage port 18a, 18b Drainage valve 19a, 19b Water supply port 20a, 20b Water supply port 25a, 25b Electric heater 26a, 26b, 26c Thermistor 26d, 26e, 26f Thermistor 27 Partition Board

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyoshi Sakuma 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Tetsuji Okada 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Incorporated (56) References JP-A-58-110942 (JP, A) JP-A-1-97147 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/18 F24H 1/18 302 F24H 1/00 611

Claims (4)

(57) [Claims] A heating unit provided with a heat pump system;
A plurality of hot water storage tanks arranged in parallel with each other, a circulating system that connects the heating unit and each of the hot water storage tanks, circulates water in each of the hot water storage tanks to the heating unit and performs boiling, and is connected to a lower portion of each of the hot water storage tanks; A hot water supply system for supplying hot water to the hot water storage tank, a hot water supply system connected to the top of each hot water storage tank and supplying hot water from the hot water storage tank, a heating heater for heating provided in each of the hot water storage tanks, and the circulation system A first multidirectional switching valve disposed between the lower portion of the heating section and the lower portion of each of the hot water storage tanks to switch between the hot water storage tanks, and a first branch valve disposed at a branch point of the water supply system that branches to each of the hot water storage tanks. A second multidirectional switching valve for switching between the hot water storage tanks ,
One hot water storage tank opened by switching the multi-way switching valve
Operation of the second multi-way switching valve.
Water supply and tapping of other hot water storage tanks opened by switching
A heat pump type hot water supply device which operates . 2. A plurality of temperature detecting means disposed in each of the hot water storage tanks for detecting a hot water temperature, and when the hot water temperature of one hot water storage tank detected by the temperature detecting means is lower than a set temperature, the hot water storage means The tank is boiled, and when the hot water temperature of the one hot water storage tank is higher than a set temperature, the tank is switched to another hot water storage tank. Control means for boiling water;
The heat pump hot water supply device according to claim 1, further comprising: 3. A plurality of temperature detecting means arranged in each of the hot water storage tanks for detecting a hot water temperature, and a predetermined hot water temperature of the one hot water storage tank during tapping detected by the temperature detecting means is set. 2. The heat pump type hot water supply apparatus according to claim 1, further comprising control means for preventing running out of hot water by switching to hot water from another hot water storage tank when the temperature falls below the temperature. 4. An outside air temperature detecting means disposed near the outside of the hot water storage tank to detect an outside air temperature, and the outside air temperature near the outside of the hot water storage tank detected by the outside air temperature detecting means is set to a first set temperature. In the following cases, all the hot water storage tanks are heated by a heater after the heat pump is heated, and when the outside air temperature is equal to or higher than a second set temperature,
When only the heat pump boils and the outside air temperature is equal to or higher than the first set temperature and equal to or lower than the second set temperature, all the hot water storage tanks are boiled by the heat pump, and then, some of the hot water storage tanks are heated.
The heat pump hot water supply apparatus according to claim 1, further comprising control means for performing heating by the heating heater.