JP6458541B2 - Heat distribution unit for heating circuit - Google Patents

Description

  The present invention relates to a heat distribution unit for a heating circuit, and more particularly to a heat distribution unit capable of distributing heat recovered from one or a plurality of external heat source unit to a plurality of hot water storage tank units.

  Conventionally, heat generated by one or a plurality of external heat source unit units (for example, a fuel cell power generation device, a gas engine power generation device, a heat pump heat source device, etc.) installed outdoors in a two-family house or an apartment house, A hot water storage system that stores heat in hot water storage tanks of a plurality of hot water storage tank units using a heat medium circulating in a heating circuit, and supplies hot water from these hot water storage tanks to a desired hot water supply destination such as a hot water tap or a bath. Hot water storage and hot water supply devices) are in practical use.

  In order to realize high efficiency operation of the hot water storage hot water system described above, the hot water storage hot water system is a heat exchange system that allows heat to be shared among a plurality of hot water storage tank units so that heat recovered from the external heat source unit is not wasted. May have a function. The technology of this heat interchange function is disclosed in various documents as shown below.

  For example, in the heat accommodation control method of Patent Document 1, when there is surplus heat recovered from the fuel cell power generation device, heat accommodation is performed in the hot water storage tank of the solar water heater interconnected with the hot water storage tank of the fuel cell power generation device. Techniques to do this are disclosed. In the heat interchange control method of Patent Literature 2, when there is surplus heat in the heat recovered from the fuel cell power generation device, there is a technique for heat interchange to a hot water storage tank of a heat pump unit interconnected with the hot water storage tank of the fuel cell power generation device. It is disclosed.

  In addition, in the fuel cell system of Patent Document 3, a technique is disclosed in which heat from a plurality of fuel cell power generators is interchanged between a plurality of hot water storage tanks. Multiple hot water storage tanks are installed in close proximity, the upper part of each hot water storage tank is connected via multiple upper connection pipes, and the lower part of each hot water storage tank is connected via multiple lower connection pipes. By controlling the circulation pump and the on-off valve installed in the piping, heat exchange can be achieved.

JP 2012-159243 A JP 2012-225543 A Japanese Patent No. 4902997

  However, in the heat interchange control methods of Patent Documents 1 to 3, in order to exchange hot water between a plurality of hot water storage tanks (a plurality of hot water storage tank units) (heat interchange), there is a dedicated connection between the plurality of hot water storage tank units. Since a pipe connection structure is required, the existing hot water storage tank unit cannot be used. For this reason, since a dedicated hot water storage tank unit corresponding to heat interchange control is required, there is a problem that the system becomes complicated and time-consuming to install, resulting in high costs.

  It is an object of the present invention to provide a heat distribution unit for a heating circulation circuit that can easily distribute the heat recovered from one or a plurality of external heat source unit to a plurality of hot water storage tank units. It is to provide the one that can use the existing hot water storage tank unit, etc.

The heat distribution unit for a heating circulation circuit according to claim 1 is for a heating circulation circuit interposed in a heating circulation circuit that recovers heat generated from an external heat source unit using a heat medium and stores the heat in a plurality of hot water storage tank units. A heat distribution unit, a main body case, a pair of heat source unit side connection ports installed in the main body case and connected to an inlet and an outlet of a heat medium of the external heat source unit; and the main body case A plurality of pairs of tank side connection ports installed and connected to a heat medium outlet and introduction port of the plurality of hot water storage tank units, the pair of heat source unit side connection ports and the plurality of pairs inside the main body case; An internal passage communicating with the tank side connection port, and the internal passage for connecting at least one pair of tank side connection ports of the pair of heat source unit side connection ports and the plurality of pairs of tank side connection ports. Pair in the passage And a filled-in switching valve means, the temperature detecting means is disposed downstream of the merging portion of the passage portion from the plurality of hot water storage tank unit in said internal passage, said switching valve means is detected by said temperature detecting means Switching is performed when the detected temperature exceeds a preset temperature set in advance .

  According to the first aspect of the present invention, the heat distribution unit for the heating circulation circuit has the configuration described in the section for solving the above-mentioned problems. The recovered heat can be easily distributed to a plurality of hot water storage tank units via the internal passage.

  Therefore, by interposing the heat distribution circuit heat distribution unit in the middle of the heat circulation circuit, heat distribution between the external heat source unit and the plurality of hot water storage tank units can be executed, and between the plurality of hot water storage tank units. In addition, heat exchange is possible without providing a complicated pipe connection structure, so that the cost can be reduced by using an existing hot water storage tank unit. Since the heat distribution unit for the heating circulation circuit is configured in a unit shape, it can be easily incorporated into the heating circulation circuit and the workability is improved.

In the internal passage, temperature detection means is installed on the downstream side of the merging portion of the passage portions from the plurality of hot water storage tank units, and the switching valve means has a preset detected temperature detected by the temperature detection means. Since it is switched when exceeding, the heat of the external heat source unit can be efficiently distributed by appropriately changing the heat storage destination according to the temperature of the heat medium flowing through the internal passage.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the hot water storage hot-water supply system in which the heat distribution unit for heating circulation circuits which concerns on Example 1 was integrated. It is a flowchart of waste heat recovery operation control. 6 is a flowchart of exhaust heat recovery operation control according to the second embodiment. It is a schematic block diagram of the hot water storage hot-water supply system in which the heat distribution unit for heating circulation circuits which concerns on Example 3 was integrated. It is a schematic block diagram of the hot water storage hot-water supply system in which the heat distribution unit for heating circulation circuits which concerns on Example 4 was integrated. It is a schematic block diagram of the hot water storage hot-water supply system in which the heat distribution unit for heating circulation circuits which concerns on Example 5 was integrated.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

First, the whole structure of the hot water storage hot water supply system 1 in which the heat distribution unit 10 for the heating circulation circuit of the present invention is incorporated will be briefly described.
As shown in FIG. 1, a hot water storage and hot water supply system 1 corresponds to a two-family house, an apartment house, etc., and a plurality of hot water storage units installed corresponding to a common external heat source unit 2, each home and each dwelling unit. Tank units 3 and 4, a hot water storage tank unit 3 and 4, and a heating circulation circuit 5 that connects the external heat source unit 2 are provided.

  As the external heat source unit 2, for example, a fuel cell power generation device that performs power generation including the heat exchanger 2 a, the circulation pump 6, the control unit 19, and the like can be used. The case member 2 </ b> A of the external heat source unit 2 is provided with a heat medium inlet 7 a and an outlet 7 b that constitute a part of the heating circuit 5. The hot water storage and hot water supply system 1 constitutes a fuel cell cogeneration system by being combined with a fuel cell power generation device, but since the configuration of the fuel cell power generation device is known, detailed description thereof is omitted.

Next, the plurality of hot water storage tank units 3 and 4 will be described.
As shown in FIG. 1, the plurality of hot water storage tank units 3, 4 includes a first hot water storage tank unit 3 and a second hot water storage tank unit 4. The first hot water storage tank unit 3 has functions such as hot water storage, hot water supply, hot and cold water supply to a bath, supply of hot water to a hot water heating terminal such as a floor heating panel, and the like. A hot water storage tank 3a, a water supply passage 3b, a hot water supply passage 3c, a control unit 3d, and the like are provided. The second hot water storage tank unit 4 has the same function as the first hot water storage tank unit 3, and includes a second case member 4A, a second hot water storage tank 4a, a water supply passage 4b, a hot water supply passage 4c, a control unit 4d, and the like. ing.

  The first case member 3A is provided with a heat medium outlet 8a and an inlet 8b that constitute a part of the heating circulation circuit 5, and the second case member 4A constitutes a part of the heating circulation circuit 5. A heat medium outlet 9a and an inlet 9b are provided. In addition, although the 1st, 2nd hot water storage tank units 3 and 4 are provided with various valves, such as various passages, a mixing valve, and an on-off valve other than said instrument, illustration is abbreviate | omitted. In addition, the first and second hot water storage tank units 3 and 4 may have the same function or may have different functions.

  As shown in FIG. 1, the first and second hot water storage tanks 3a and 4a store hot hot water heated by the external heat source unit 2, and are made of stainless steel plates having excellent corrosion resistance. And a pair of end plates that close both upper and lower ends thereof, and the tank periphery is covered with a heat insulating material to prevent heat dissipation of the stored hot water. The first and second hot water storage tanks 3a and 4a have the same capacity and shape in the present embodiment, but are not particularly limited to the same capacity and shape, and may have shapes having different capacities.

  The first and second hot water storage tanks 3a and 4a are connected to water supply passages 3b and 4b, hot water supply passages 3c and 4c, a heating circulation circuit 5 and the like, respectively, and supply water from a water source through the water supply passages 3b and 4b. The first and second hot water storage tanks 3a and 4a can be replenished, respectively, and hot water is heated through the heating circulation circuit 5, and the first and second hot water storage tanks 3a and 4a are connected through the hot water supply passages 3c and 4c. The hot hot water (for example, 65-90 degreeC) each stored in 4a can be supplied to a desired hot-water supply destination.

Next, the heating circuit 5 will be described.
As shown in FIG. 1, the heating circuit 5 circulates a heat medium (hot water) between the first and second hot water storage tank units 3, 4 and the external heat source unit 2 to heat the external heat source unit 2. A closed circuit that collects (exhaust heat), a plurality of tank-side forward passages 5a, 5b, a single heat source unit-side forward passage 5c, a single heat source unit-side return passage 5d, a plurality of tank-side return passages 5e, 5f, A heat distribution circuit heat distribution unit 10 and the like which will be described later are included.

  The tank-side forward passages 5a and 5b extend from the lower ends of the first and second hot water storage tanks 3a and 4a, respectively, and are connected to the heat distribution circuit heat distribution unit 10, and from the heat circulation circuit heat distribution unit 10 to the heat source side. The passage 5c extends and is connected to the heat exchanger 2a of the external heat source unit 2, and the heat source unit side return passage 5d extends from the heat exchanger 2a and is connected to the heat distribution circuit heat distribution unit 10 to heat the heat circulation circuit. A plurality of tank-side return passages 5e and 5f extend from the distribution unit 10 and are connected to upper ends of the first and second hot water storage tanks 3a and 4a, respectively. A circulation pump 6 is installed in the heat source unit-side outgoing passage 5 c inside the external heat source unit 2.

  The first and second hot water storage tank units 3 and 4 are controlled by the control units 3d and 4d, respectively. Detection signals from various sensors are transmitted to the control units 3d and 4d. The control units 3d and 4d operate the first and second hot water tank units 3 and 4, operate and stop various pumps, and control various valves. Various operations (hot water supply operation, hot water filling operation, reheating operation, high temperature hot water supply operation, heating operation, antifreezing operation, exhaust heat recovery operation, etc.) are executed by controlling switching of the open / close state and opening degree adjustment.

Next, the heat distribution unit 10 for a heating circuit according to the present invention will be described.
As shown in FIG. 1, the heat distribution unit for heating circulation circuit 10 (hereinafter referred to as heat distribution unit 10) can distribute the heat recovered from the external heat source unit 2 to the first and second hot water storage tanks 3a and 4a. It is comprised, and it is interposed in the middle part of the heating circulation circuit 5 which collects the heat generated from the external heat source unit 2 using a heat medium and stores it in the first and second hot water storage tanks 3a, 4a. Yes.

  That is, the heat distribution unit 10 includes a box-shaped main body case 11 and a pair of heat source units installed in the main body case 11 and connected to the heat medium inlet 7a and the outlet 7b of the external heat source unit 2. Connection ports 12a and 12b and a plurality of pairs of tank-side connections installed in the body case 11 and connected to the heat medium outlets 8a and 9a and the inlets 8b and 9b of the first and second hot water storage tank units 3 and 4 An internal passage 14 communicating with the ports 13a to 13d, the pair of heat source unit side connection ports 12a and 12b and the plurality of pairs of tank side connection ports 13a to 13d in the main body case 11, and a pair of heat source unit side connection A three-way valve incorporated in the internal passage 14 for connecting the ports 12a, 12b and at least one pair of tank side connection ports 13a, 13c or 13b, 13d among the plurality of pairs of tank side connection ports 13a-13d 5 and a (corresponding to a switching valve means).

  Each of the connection ports 12a, 12b, 13a to 13d is installed on the outer peripheral wall portion of the main body case 11 so as to protrude outward, and has a structure of a union joint or a quick detachable joint. At the end of each passage portion 5a-5f of the heating circuit 5 corresponding to each connection port 12a, 12b, 13a-13d, it can be easily removed corresponding to the shape of each connection port 12a, 12b, 13a-13d. Each joint is provided. Each connection port 12a, 12b, 13a-13d is provided with a drain plug (not shown).

  The internal passage 14 includes a plurality of tank-side forward internal passage portions 14a and 14b, a single heat source side forward internal passage portion 14c, a single heat source side return internal passage portion 14d, and a plurality of tank-side return internal passage portions 14e and 14f. have. Tank side forward internal passage portions 14a and 14b respectively extend from connection ports 13a and 13b to which the downstream ends of the tank side forward passages 5a and 5b are connected, and the downstream ends of the plurality of tank side forward internal passage portions 14a and 14b are joined together. Then, the heat source machine side forward internal passage part 14c extends from this junction, and the downstream end of the heat source machine side forward internal passage part 14c is connected to the connection port 12a to which the upstream end of the heat source machine side forward passage 5c is connected. ing.

  The heat source machine side return internal passage part 14d extends from the connection port 12b to which the downstream end of the heat source machine side return path 5d is connected. The tank-side return internal passage portions 14e and 14f extend, and the downstream ends of the plurality of tank-side return internal passage portions 14e and 14f are respectively connected to connection ports 13c and 13d to which the upstream ends of the tank-side return passages 5e and 5f are connected. It is connected. When the heat distribution unit 10 is assembled, the heat distribution unit 10 can be easily installed in the middle of the heating circuit 5 by connecting the passages 5a to 5f of the heating circuit to the connection ports 12a, 12b, and 13a to 13d. can do. In addition, although the internal channel | path 14 consists of a copper pipe, for example, it is not necessary to specifically limit a material.

  The three-way valve 15 is installed at a junction between the plurality of tank-side forward internal passage portions 14a and 14b and one heat source unit-side forward internal passage portion 14c. The three-way valve 15 is controlled by a heat distribution control unit 18. The downstream end of the tank-side forward internal passage portion 14a is connected to the three-way valve 15 (port A), and the downstream end of the tank-side forward internal passage portion 14b is connected to the three-way valve 15 (port B). The upstream end of the portion 14c is connected to the three-way valve 15 (port C), and the three-way valve 15 causes the heat source machine side forward internal passage portion 14c to be connected to either the tank side forward internal passage portion 14a or the tank side forward internal passage portion 14b. Alternatively connected.

  When the hot water in the first hot water storage tank 3a is circulated to the heating circulation circuit 5, the tank-side forward internal passage portion 14b side is closed via the three-way valve 15 to bring the heating circulation circuit 5 into a circulation state. That is, the port A-port C of the three-way valve 15 is opened, and the tank-side forward internal passage portion 14a and the heat source unit-side forward internal passage portion 14c are connected. When the hot water in the second hot water storage tank 4a is circulated to the heating circulation circuit 5, the tank-side forward internal passage portion 14a side is closed via the three-way valve 15 to bring the heating circulation circuit 5 into a circulation state. That is, the port B-port C of the three-way valve 15 is opened, and the tank-side forward internal passage portion 14b and the heat source unit-side forward internal passage portion 14c are connected.

  In the internal passage 14, a temperature detection sensor 16 (corresponding to temperature detection means) is installed on the downstream side of the joining portion of the passage portion from the first and second hot water storage tank units 3 and 4. That is, the temperature detection sensor 16 is installed in the heat source machine-side forward internal passage portion 14 c downstream of the three-way valve 15 in the internal passage 14. The temperature detection sensor 16 is a known temperature detection sensor 16 such as a thermistor, and can detect the temperature of hot water flowing through the heat source unit-side outgoing internal passage portion 14 c toward the external heat source unit 2.

Next, the heat distribution control unit 18 will be described.
The heat distribution unit 10 is controlled by a heat distribution control unit 18. The detection signal of the temperature detection sensor 16 is transmitted to the heat distribution control unit 18, and the heat distribution control unit 18 controls the switching of the three-way valve 15, and the exhaust heat recovery operation (first hot water storage tank 3a based on various modes). Exhaust heat recovery operation using hot water, exhaust heat recovery operation using hot water of the second hot water storage tank 4a, etc.). The heat distribution control unit 18 is configured to be able to communicate with the control units 3d and 4d.

  Next, the exhaust heat recovery operation control based on various modes automatically executed by the heat distribution control unit 18 will be described based on the flowchart of FIG. In the figure, the symbol Si (i = 1, 2,...) Indicates each step. The control program for the exhaust heat recovery operation control is stored in advance in the heat distribution control unit 18.

  In the flowchart of FIG. 2, when this control is started, first, in S1, the exhaust heat recovery operation start condition is established based on signals from the external heat source unit 2 and the first and second hot water storage tank units 3 and 4. It is determined whether or not. When the condition for starting the exhaust heat recovery operation is satisfied, that is, when the determination of S1 is Yes, the process proceeds to S2, and the heat distribution control unit 18 is connected between the port A and the port C of the three-way valve 15. Is opened, the tank-side forward internal passage portion 14a and the heat source unit-side forward internal passage portion 14c are connected, the exhaust heat recovery operation using hot water in the first hot water storage tank 3a is executed, and the process proceeds to S3. . If S1 is No, repeat S1.

  Next, in S3, the detection signal of the temperature detection sensor 16 is read, and based on this detection signal, the hot water temperature of the first hot water storage tank 3a flowing through the heat source unit-side forward passage 14c is calculated, and the process proceeds to S4. Then, it is determined whether or not the hot water temperature in the first hot water storage tank 3a is equal to or higher than a set temperature (for example, 65 ° C.). When the hot / cold water temperature is lower than the set temperature, that is, when S4 is No, S3 and S4 are repeated.

  Next, in S5, the heat distribution control unit 18 opens the port B-port C of the three-way valve 15 and connects the tank-side forward internal passage portion 14b and the heat source unit-side forward internal passage portion 14c. Then, the circulation of the hot water in the first hot water storage tank 3a is stopped, the exhaust heat recovery operation using the hot water in the second hot water storage tank 4a is executed, and the process proceeds to S6.

  Next, in S6, the detection signal of the temperature detection sensor 16 is read, and based on this detection signal, the hot water temperature of the second hot water storage tank 4a flowing through the heat source unit-side forward internal passage portion 14c is calculated, and the process proceeds to S7. It is determined whether the hot water temperature in the second hot water storage tank 4a is equal to or higher than a set temperature (for example, 65 ° C.). If the hot water temperature is higher than the set temperature, that is, if the determination in S7 is Yes, the process returns to S2. The circulation of the hot water in the second hot water storage tank 4a is stopped, and the exhaust heat recovery operation using the hot water in the first hot water storage tank 3a is executed. When the hot water temperature is lower than the set temperature, that is, when S7 is No, S6 and S7 are repeated.

  If the first and second hot water storage tanks 3a and 4a are fully stored and the switching of the three-way valve 15 is frequently repeated, the exhaust heat cannot be efficiently recovered from the external heat source unit 2. The exhaust heat recovery operation may be executed while forcibly cooling the hot water flowing through the heating circulation circuit 5 by starting a radiator (not shown) or the like installed in the middle of the circulation circuit 5.

Next, the operation and effect of the heat distribution unit 10 of the present invention will be described.
Since the heat distribution unit 10 has the above-described configuration, the heat recovered from the external heat source unit 2 is switched to the first and second hot water storage tank units 3 and 4 via the internal passage 14 by switching the three-way valve 15. Can be easily distributed.

  Therefore, by interposing the heat distribution unit 10 in the middle of the heating circuit 5, heat distribution between the external heat source unit 2 and the first and second hot water tank units 3 and 4 can be executed. Since heat exchange is possible without providing a complicated pipe connection structure between the first and second hot water storage tank units 3 and 4, the cost is reduced by using the existing hot water storage tank units 3 and 4. Since the heat distribution unit 10 is configured in a unit shape, the heat distribution unit 10 can be easily incorporated into the heating circulation circuit 5 and the workability is improved.

  Further, in the internal passage 14, the temperature is detected in the heat source machine-side forward internal passage portion 14c downstream of the junction portion of the passage portions (tank-side forward internal passage portions 14a, 14b) from the first and second hot water storage tank units 3, 4. Since the sensor 16 is installed and the three-way valve 15 is switched when the detected temperature detected by the temperature detection sensor 16 exceeds a preset temperature, a heat storage destination (in accordance with the temperature of hot water flowing through the internal passage 14 ( By appropriately changing the first and second hot water storage tanks 3a and 4a), the heat of the external heat source unit 2 can be efficiently distributed.

  Next, a second embodiment in which the exhaust heat recovery operation control of the first embodiment is partially changed will be described. In the first embodiment, the switching control of the three-way valve 15 is executed in accordance with the temperature of hot water flowing through the internal passage 14, but in the second embodiment, the switching control of the three-way valve 15 is executed in accordance with the set time.

  Here, the exhaust heat recovery operation control based on various modes automatically executed by the heat distribution control unit 18 will be described based on the flowchart of FIG. 3. The control program for the exhaust heat recovery operation control is stored in advance in the heat distribution control unit 18. Since S1, S2, and S5 are the same as those in the first embodiment, description thereof is omitted.

  Instead of S3 and S4 in the first embodiment, in S11 in the second embodiment, it is determined whether or not the first set time has elapsed. When the first set time has elapsed, that is, the first set time (for example, 1 hour) set in advance according to the predicted required heat amount of the first hot water storage tank unit 3, the capacity of the first hot water storage tank 3a, etc. has elapsed. If yes, the determination in S11 is Yes, and the process proceeds to S5. If the determination in S11 is No, S11 is repeated.

  Instead of S6 and S7 in the first embodiment, in S12 in the second embodiment, it is determined whether or not the second set time has elapsed. When the second set time has elapsed, that is, the second set time (for example, 1.5 hours) set in advance according to the predicted required heat amount of the second hot water tank unit 4, the capacity of the second hot water tank 4a, etc. If it is, the determination in S12 is Yes, the process returns to S2, and S12 is repeated while the determination in S12 is No.

  Thus, since the three-way valve 15 is switched every time one or more set times elapse, the heat storage destination (the first hot water storage tank 3a or the second hot water storage tank 4a) according to the elapse of one or more set times. By appropriately changing, the heat of the external heat source unit 2 can be efficiently distributed. Since other configurations, operations, and effects are the same as those in the first embodiment, further description is omitted.

  Next, a third embodiment in which the heat distribution unit 10 of the first embodiment is partially changed will be described. In the first embodiment, the three-way valve 15 is installed as the switching valve means, but in the third embodiment, a pair of on-off valves 21 and 22 are installed as the switching valve means.

  As shown in FIG. 4, in the heat distribution unit 10 </ b> A, a pair of on-off valves 21 and 22 (corresponding to switching valve means) are installed instead of the three-way valve 15 of the first embodiment. That is, the first open / close valve 21 is installed in the tank-side forward internal passage portion 14a, and the second open / close valve 22 is installed in the tank-side forward internal passage portion 14b. Depending on the temperature of hot water flowing through the internal passage 14 or the set time, the first and second on-off valves 21 and 22 cause the heat source machine-side forward internal passage portion 14c to be connected to the tank-side forward internal passage portion 14a and the tank-side forward interior. It is alternatively connected to one of the passage portions 14b.

  According to this structure, when the hot water in the first hot water storage tank 3a is circulated through the heating circuit 5, the second on-off valve 22 is closed to close the tank-side forward internal passage portion 14b, and the first The on-off valve 21 is opened to connect the tank-side forward internal passage portion 14a and the heat source unit-side forward internal passage portion 14c to bring the heating circulation circuit 5 into a circulating state.

  Further, when the hot water in the second hot water storage tank 4a is circulated through the heating circuit 5, the first on-off valve 21 is closed, the tank-side forward internal passage portion 14a is closed, and the second on-off valve 22 is opened. The tank-side forward internal passage portion 14b and the heat source unit-side forward internal passage portion 14c are connected to the heating circulation circuit 5 in a circulating state by opening the valve. Since other configurations, operations, and effects are the same as those in the first embodiment, further description is omitted.

  Next, a fourth embodiment in which the heat distribution unit 10 of the first embodiment is partially changed will be described. The heat distribution unit 10 according to the first embodiment is configured to correspond to one external heat source unit 2, but the heat distribution unit 10 </ b> B according to the fourth embodiment includes two sets of external heat source units 2, 20. It is comprised so that it may correspond.

  As shown in FIG. 5, the hot water storage and hot water system 1B corresponds to a two-family house or an apartment house, and a plurality of external heat source unit units 2, 20 are installed corresponding to each home or each dwelling unit. The hot water storage tank units 3 and 4, the hot water storage tank units 3 and 4, and the heating circuit 5 B for connecting the external heat source unit 2 are provided.

  As the first external heat source unit 2, for example, a fuel cell power generator including a heat exchanger 2 a, a circulation pump 6 and a control unit 19 can be used. The case member 2A of the external heat source unit 2 is provided with a heat medium inlet 7a and an outlet 7b that constitute a part of the heating circuit 5B. In addition, since the structure of a fuel cell power generator is a well-known thing, detailed description is abbreviate | omitted.

  As the second external heat source unit 20, for example, a heat pump type heat source unit including a heat exchanger 22a, a circulation pump 26, and a control unit 29 can be used. The case member 20A of the external heat source unit 20 is provided with an inlet 27a and an outlet 27b for a heat medium that constitutes a part of the heating circuit 5B. In addition, since the structure of a heat pump type heat source machine is a well-known thing, detailed description is abbreviate | omitted.

Next, the heating circuit 5B will be described.
As shown in FIG. 1, the heating circulation circuit 5 circulates a heat medium (hot water) between the first and second hot water storage tank units 3 and 4 and the first and second external heat source unit 2 and 20. It is a closed circuit that heats the heat medium (hot water) using heat generated by the first and second external heat source units 2 and 20, and includes a plurality of tank side forward passages 5a and 5b, and a plurality of heat source unit side forward passages 5c, 5g, a plurality of heat source unit side return passages 5d, 5h, a plurality of tank side return passages 5e, 5f, a heating circulation circuit heat distribution unit 10B described later, and the like.

  Tank-side forward passages 5a and 5b extend from the lower ends of the first and second hot water storage tanks 3a and 4a, respectively, and are connected to the heat distribution circuit heat distribution unit 10B. The side passages 5c and 5g extend to be connected to the heat exchangers 2a and 22a of the first and second external heat source unit 2 and 20, respectively.

  Further, the heat source unit side return passages 5d and 5h extend from the heat exchangers 2a and 22a, respectively, and are connected to the heat circulation circuit heat distribution unit 10B. From the heat circulation circuit heat distribution unit 10B, a plurality of tank side return passages 5e, 5f extends and is connected to the upper ends of the first and second hot water storage tanks 3a and 4a, respectively. A circulation pump 6 is installed in the heat source machine side forward passage 5 c inside the external heat source unit 2, and a circulation pump 26 is installed in the heat source machine side forward passage 5 g inside the external heat source unit 20.

Next, the heat distribution unit 10B will be described.
As shown in FIG. 1, the heat distribution unit 10B is configured to be able to distribute the heat recovered from the first and second external heat source units 2 and 20 to the first and second hot water storage tanks 3a and 4a. The heat generating circuit recovers heat generated from the first and second external heat source unit units 2 and 20 and stores the heat in the first and second hot water storage tanks 3a and 4a. ing.

  That is, the heat distribution unit 10B includes a box-shaped main body case 31 and heat medium inlets 7a and 27a and outlet ports 7b of the first and second external heat source unit units 2 and 20 installed in the main body case 31. A plurality of pairs of heat source unit side connection ports 32a to 32d connected to 27b, heat medium outlets 8a and 9a and introduction ports 8b installed in the body case 31 and of the first and second hot water storage tank units 3 and 4; The inside which connects a plurality of pairs of tank side connection ports 33a-33d connected to 9b, a plurality of pairs of heat source machine side connection ports 32a-32d, and a plurality of pairs of tank side connection ports 33a-33d inside main part case 31 Of the passage 34 and at least one pair of the heat source unit side connection ports 32a to 32d among the plurality of pairs of heat source unit side connection ports 32a to 32d, of the plurality of pairs of tank side connection ports 33a to 33d. First and second three-way valves 35 and 36 (corresponding to switching valve means) incorporated in the internal passage 34 for connecting at least one pair of tank side connection ports 33a and 33c or 33b and 33d. ing.

  Each of the connection ports 32a to 32d and 33a to 33d is provided on the outer peripheral wall portion of the main body case 31 so as to protrude outward, and has a structure of a union joint or a quick detachable joint. The end portions of the passage portions 5a to 5h of the heating circuit 5B corresponding to the connection ports 32a to 32d and 33a to 33d can be easily removed corresponding to the shapes of the connection ports 32a to 32d and 33a to 33d. Each joint is provided. Each of the connection ports 32a to 32d and 33a to 33d includes a drain plug (not shown).

  The internal passage 34 includes a plurality of tank-side forward internal passage portions 34a and 34b, a common forward internal passage portion 34c, a plurality of heat source unit-side forward internal passage portions 34d and 34e, a plurality of heat source unit-side return internal passage portions 34f and 34g, It has a common return internal passage portion 34h and a plurality of tank side return internal passage portions 34i, 34j.

  The tank-side forward internal passage portions 34a and 34b extend from a pair of connection ports 33a and 33b to which the downstream ends of the tank-side forward passages 5a and 5b are connected, respectively. The internal passage portion 34c extends, and a plurality of heat source unit side forward internal passage portions 34d, 34e branch from this downstream end, and these downstream ends are connected to the upstream ends of the plurality of heat source unit side forward passages 5c, 5g, respectively. Also connected to a pair of connection ports 32a and 32b.

  The heat source machine side return internal passage portions 34f and 34g extend from a pair of connection ports 32c and 32d to which the downstream ends of the heat source machine side return passages 5d and 5h are connected, respectively, and these downstream ends are merged. A common return internal passage portion 34h extends, a plurality of tank side return internal passage portions 34i, 34j branch from this downstream end, and these downstream ends are connected to the upstream ends of the tank side return passages 5e, 5f, respectively. A pair of connection ports 33c and 33d are connected to each other.

  When the heat distribution unit 10B is assembled, the heat distribution unit 10B can be easily installed in the middle of the heating circuit 5B by connecting the passages 5a to 5h of the heating circuit to the connection ports 32a to 32d and 33a to 33d. can do. In addition, although the internal channel | path 34 consists of a copper pipe, for example, it is not necessary to specifically limit a material.

  The first three-way valve 35 is installed at a junction between the plurality of tank-side forward internal passage portions 34a and 34b and the common forward internal passage portion 34c. The first three-way valve 35 is controlled by the heat distribution control unit 18B. The downstream end of the tank-side forward internal passage portion 34a is connected to the first three-way valve 35 (port A), and the downstream end of the tank-side forward internal passage portion 34b is connected to the first three-way valve 35 (port B). The upstream end of the internal passage portion 34c is connected to the first three-way valve 35 (port C). The first three-way valve 35 causes the common forward internal passage portion 34c to be connected to the tank-side forward internal passage portion 34a and the tank-side forward internal passage portion 34b. Alternatively.

  When the hot water in the first hot water storage tank 3a is circulated to the heating circuit 5B, the tank-side forward internal passage 34b is closed via the first three-way valve 35 so that the heating circuit 5 is circulated. That is, the port A-port C of the first three-way valve 35 is opened, and the tank-side forward internal passage portion 34a and the common forward internal passage portion 34c are connected. When the hot water in the second hot water storage tank 4a is circulated through the heating circuit 5, the tank-side forward internal passage 34a is closed via the first three-way valve 35 to bring the heating circuit 5B into a circulating state. That is, the port B-port C of the first three-way valve 35 is opened, and the tank-side forward internal passage portion 34b and the common forward internal passage portion 34c are connected.

  The second three-way valve 36 is installed at the junction of the common forward internal passage 34c and the plurality of heat source unit forward internal passages 34d and 34e. The second three-way valve 36 is controlled by the heat distribution control unit 18B. The downstream end of the common forward internal passage portion 34c is connected to the second three-way valve 36 (port D), and the upstream end of the heat source device-side forward internal passage portion 34d is connected to the second three-way valve 36 (port E). The upstream end of the side forward internal passage portion 34e is connected to the second three-way valve 36 (port F), and the second forward three-way valve 36 causes the common forward internal passage portion 34c to be connected to the heat source unit forward internal passage portion 34d and the heat source unit side forward. It is alternatively connected to any of the internal passage portions 34e.

  When circulating hot water to the first external heat source unit 2, the heat source unit-side outgoing internal passage 34 e side is closed via the second three-way valve 36, and the heating circuit 5 B is circulated. That is, the port D-port E of the second three-way valve 36 is opened, and the common forward internal passage 34c and the heat source unit forward internal passage 34d are connected. When circulating hot water to the second external heat source unit 20, the heat source side forward internal passage 34 d side is closed via the second three-way valve 36, and the heating circuit 5 B is circulated. That is, the port D and the port F of the second three-way valve 36 are opened, and the common forward internal passage 34c and the heat source unit forward internal passage 34d are connected.

  In the internal passage 34, the temperature detection sensor 16 is installed on the downstream side of the joining portion of the passage portion from the first and second hot water storage tank units 3 and 4. That is, the temperature detection sensor 16 is installed in the common forward internal passage portion 34 c of the first three-way valve 35 in the internal passage 34. This temperature detection sensor 16 is a known temperature detection sensor 16 such as a thermistor, and can detect the temperature of hot water flowing through the common internal passage portion 34 c toward the first and second external heat source unit 2, 20. .

Next, the heat distribution control unit 18B will be described.
The heat distribution unit 10B is controlled by a heat distribution control unit 18B. The heat distribution control unit 18B is configured to be communicable with the control units 3d and 4d of the first and second hot water storage tank units 3 and 4 and the control units 19 and 29 of the first and second external heat source unit 2 and 20. ing.

  The detection signal of the temperature detection sensor 16, the signal based on the heat storage status of each of the first and second hot water storage tank units 3 and 4, and the signal based on the operating status of each of the first and second external heat source unit 2 and 20 are heat. This is transmitted to the distribution control unit 18B, and the heat distribution control unit 18B controls the switching of the first three-way valve 35 according to the temperature of hot water flowing through the internal passage 14, and the first and second external heat source unit 2 , 20 is controlled in accordance with the operation status of each of the two, three-way valves 36, and hot water heating operation based on various modes (hot water in the first hot water storage tank 3a using the heat of the first external heat source unit 2). Or the hot water heating operation which heats the hot water of the 2nd hot water storage tank 4a, the hot water heating operation which heats the hot water of the 1st hot water storage tank 3a or the hot water of the 2nd hot water storage tank 4a using the heat of the 2nd external heat source unit 20, etc. ) Row.

Next, the operation and effect of the heat distribution unit 10B of the present invention will be described.
Since the heat distribution unit 10B has the above-described configuration, the heat recovered from the first and second external heat source unit 2 and 20 can be transferred to the internal passage 34 by switching the first and second three-way valves 35 and 36. It can be easily distributed to the first and second hot water storage tank units 3 and 4.

  Therefore, the heat between the first and second external heat source unit units 2 and 20 and the first and second hot water storage tank units 3 and 4 is provided by interposing the heat distribution unit 10B in the middle of the heating circuit 5B. Since distribution becomes feasible, heat interchange is possible without providing a complicated piping connection structure between the first and second external heat source unit units 2 and 20 and between the first and second hot water storage tank units 3 and 4. Cost is reduced by using the existing first and second external heat source unit 2 and 20 and the existing hot water storage tank units 3 and 4. Since the heat distribution unit 10B is configured in a unit shape, the heat distribution unit 10B can be easily incorporated into the heating circulation circuit 5B, and the workability is improved.

  In addition, since the second three-way valve 36 is switched according to the operation status of each of the plurality of external heat source unit 2, 20, by appropriately changing the heating destination of the hot water according to the operation status, the plurality of external heat source units The heat of the machine units 2 and 20 can be recovered efficiently. For example, during the daytime, hot water is heated by the first external heat source unit 2 that is a fuel cell power generator, and at night when power is inexpensive, the hot water is supplied by the second external heat source unit 20 that is a heat pump heat source unit. Can be heated. Since other configurations, operations, and effects are the same as those in the first embodiment, further explanation is omitted.

  Next, a fifth embodiment in which the heat distribution unit 10B of the fourth embodiment is partially changed will be described. In the fourth embodiment, the first and second three-way valves 35 and 36 are installed as the switching valve means. In the fifth embodiment, only the first three-way valve 35 is installed as the switching valve means.

  As shown in FIG. 6, in the heat distribution unit 10C, the second three-way valve 36 of Example 4 is omitted, and only the first three-way valve 35 (corresponding to the switching valve means) is installed. Further, a check valve 41 that allows hot water flow to the first external heat source unit 2 and closes the reverse flow is installed in the heat source unit forward passage 5c, and a second valve is installed in the heat source unit forward passage 5g. A check valve 42 that allows hot water flow to the external heat source unit 20 and closes the reverse flow is provided.

  According to this structure, hot water is supplied from the heat distribution unit 10C to the first and second external heat source units 2 and 20 based on the rotational drive of the circulation pumps 6 and 26 of the first and second external heat source units 2 and 20. Can be automatically circulated. That is, in the fourth embodiment, hot water is heated by circulating hot water through one of the first and second external heat source unit 2 and 20 through the switching control of the second three-way valve 36. In the fifth embodiment, hot water is heated by circulating hot water in one or both of the first and second external heat source unit units 2 and 20 based on the rotational drive of the circulation pumps 6 and 26. Can do. Since other configurations, operations, and effects are the same as those in the fourth embodiment, further explanation is omitted.

  Next, the form which changed the said Examples 1-5 partially is demonstrated.

[ 1 ] The three-way valve 15 of the first and second embodiments is installed at the junction of the tank-side forward internal passage portion 14a and the tank-side forward internal passage portion 14b, and a pair of on-off valves 21 and 22 of the third embodiment. Are installed in the tank-side forward internal passage portions 14a and 14b, respectively. However, it is not particularly limited to this structure, and the three-way valve 15 of the first embodiment is replaced by the tank-side return internal passage portion 14e and the tank-side return internal portion. You may install in the branch part of the channel | path part 14f, and you may install said pair of on-off valves 21 and 22 in the tank side return internal channel | path parts 14e and 14f, respectively.

  The same applies to the first three-way valve 35 of the fourth and fifth embodiments. The first three-way valve 35 may be installed at a branch portion between the tank-side return internal passage portion 34i and the tank-side return internal passage portion 34j. The second three-way valve 36 of the fourth and fifth embodiments may be installed at the junction of the heat source machine side return internal passage portion 34f and the heat source machine side return internal passage portion 34g. Further, the first and second three-way valves 35 and 36 of the fourth and fifth embodiments may be constituted by a pair of on-off valves.

[ 2 ] In the first to third embodiments, the heat distribution units 10 and 10A have a structure corresponding to the two sets of hot water storage tank units 3 and 4. However, the present invention is not limited to this. A structure corresponding to the tank unit may be used. In the case of this structure, the number of connection ports of the heat distribution unit, the structure of the internal passage, the structure of the switching valve means (for example, the number of ports of the switching valve and the number of on-off valves) and the like are appropriately determined according to the number of hot water storage tank units. Be changed.

  Moreover, in the said Example 4, 5, heat distribution unit 10B, 10C is a structure corresponding to 2 sets of external heat-source equipment units 2 and 20, and 2 sets of hot water storage tank units 3 and 4, However, it is limited to this. The structure corresponding to two or more external heat source unit and two or more hot water storage tank units may be sufficient. In this structure, the number of connection ports of the heat distribution unit, the structure of the internal passage, the structure of the switching valve means (for example, the number of ports of the switching valve and the number of on-off valves), etc. It is changed appropriately according to the number.

[ 3 ] In the first to fifth embodiments, the hot water in the first and second hot water storage tanks 3a and 4a is directly circulated to the heating circulation circuits 5 and 5B to perform the exhaust heat recovery operation or the hot water heating operation. However, the present invention is not limited thereto, and a heating medium such as antifreeze is circulated in the heating circulation circuits 5 and 5B, and hot water in the first and second hot water storage tanks 3a and 4a is indirectly heated using the antifreeze. It may be a structure.

[ 4 ] In the first to fifth embodiments, the fuel cell power generation device has been described as the first external heat source unit 2 and the heat pump heat source unit has been described as the second external heat source unit 20, but it is necessary to limit the present invention to these. Alternatively, the first and second external heat source units 2 and 20 may be employed from a fuel cell power generation device, a gas engine power generation device, a heat pump heat source unit, a solar hot water panel, or the like. Can be adopted. When the external heat source unit 2 or 20 is a heat pump heat source unit or a solar hot water panel, a circulation pump may be installed for each hot water storage tank unit, and the position of these circulation pumps can be changed as appropriate.

[ 5 ] In the heat distribution units 10B and 10C of the fourth and fifth embodiments, these structures are not particularly limited, and the hot water heating operation in which the first external heat source unit 2 and the first hot water storage tank unit 3 are connected to each other. Operation with hot water heating operation in which the first external heat source unit 20 and the second hot water storage tank unit 4 are connected, or hot water heating operation in which the first external heat source device unit 2 and the second hot water storage tank unit 4 are connected. In order to enable simultaneous operation with hot water heating operation in which the second external heat source unit 20 and the first hot water storage tank unit 3 are connected, the heat distribution unit has a structure similar to that of the spool type directional switching valve. You may do it.

[ 6 ] In addition, those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. It is.

2, 20 1st, 2nd external heat source unit 3, 4 1st, 2nd hot water storage tank unit 5, 5B Heat circulation circuit 7a, 27a Inlet 7b, 27b 1st, 2nd external heat source unit 1 Outflow ports 8a and 9a of the second external heat source unit 1 Outlet ports 8b and 9b of the first and second hot water storage tank units Inlet ports 10 and 10A to 10C of the first and second hot water storage tank units Heat distribution unit 11 for the heating circulation circuit , 31 Main body cases 12a, 12b A pair of heat source side connection ports 13a-13d A plurality of pairs of tank side connection ports 14, 34 Internal passage 15 Three-way valve (switching valve means)
16 Temperature detection sensor (temperature detection means)
21, 22 First and second on-off valves (switching valve means)
32a to 32d Multiple pairs of heat source unit side connection ports 33a to 33d Multiple pairs of tank side connection ports 35 and 36 First and second three-way valves (switching valve means)

Claims (1)

A heat distribution unit for a heating circulation circuit that is interposed in a heating circulation circuit that collects heat generated from an external heat source unit using a heat medium and stores the heat in a plurality of hot water storage tank units,
A main body case, a pair of heat source machine side connection ports installed in the main body case and connected to the inlet and outlet of the heat medium of the external heat source unit; and the plurality of hot water storage units installed in the main body case A plurality of pairs of tank side connection ports connected to the heat medium outlet and inlet of the tank unit; and the pair of heat source unit side connection ports and the plurality of pairs of tank side connection ports inside the main body case. A switching valve incorporated in the internal passage to connect the internal passage communicating with at least one tank side connection port of the pair of heat source unit side connection ports and the plurality of pairs of tank side connection ports and means,
In the internal passage, temperature detection means is installed on the downstream side of the joining portion of the passage portion from the plurality of hot water storage tank units,
The heat distribution unit for a heating circulation circuit , wherein the switching valve means is switched when the detected temperature detected by the temperature detecting means exceeds a preset temperature .