JP5997967B2 - Heat source device and hot water heating equipment equipped with the heat source device - Google Patents

Description

The present invention relates to a heat source device that heats circulating water and supplies it to a radiator, and a hot water heating facility that includes the heat source device.

Some heat source devices connected to a radiator via an external flow path include an internal flow path that forms a closed circulation circuit integrally with the external flow path. The circulating water flowing in the circulation circuit is heated by the heat source device and then sent to the radiator. After passing through the radiator, it returns to the heat source device and is heated again and sent to the radiator. Circulating water is continuously supplied.
The radiator is, for example, a heat exchanger provided in a hot water storage tank, a heating panel for floor heating, or a heating panel standing on the floor, and the circulating circuit is used to send circulating water to the radiator. A circulation pump is provided.

By the way, circulating water expand | swells by the raise of temperature, and shrinks by the fall of temperature. For this reason, the pressure in the hermetic circulation circuit fluctuates due to the temperature change of the circulating water, which may cause damage to the pipes and members forming the circulation circuit. In order to solve this, it is effective to provide an expansion tank that absorbs the expansion and contraction of the circulating water in the circulation circuit, and a specific example is described in Patent Document 1. The expansion tank is connected to the circulation circuit via a connecting pipe. When the circulating water expands and the pressure in the circulation circuit rises, the circulating water in the circulation circuit flows into the expansion tank through the connecting pipe, and the circulating water When the pressure shrinks and the pressure in the circulation circuit decreases, the circulating water in the expansion tank is sent into the circulation circuit through the connecting pipe. Therefore, the pressure in the circulation circuit is kept within a predetermined range.

Further, since the circulating water freezes when the temperature falls below freezing point, when the heat source device is installed outdoors, it is necessary to provide the heat source device with a function for preventing the circulating water from freezing. This is because freezing of the circulating water causes damage to the pipes and members forming the circulation circuit.
For example, when the heat source device detects that the outside air has become a predetermined temperature or less, it performs a freeze prevention operation in which the circulation pump is operated and the circulating water is heated, and the heated circulating water flows in the circulation circuit. And freezing of the circulating water can be prevented.

JP-A-9-53833

However, in the heat source device of Patent Document 1, when the pressure in the circulation circuit does not change, the circulating water does not enter and leave the expansion tank. Therefore, even if the freeze prevention operation is performed in a state where the pressure in the circulation circuit does not vary. The freezing of circulating water in the expansion tank and the connecting pipe cannot be prevented. With regard to circulating water in the expansion tank, freezing can be prevented by providing a heater in the expansion tank, but if a heater is also provided in the connecting pipe in addition to the expansion tank, the manufacturing cost of the heat source device increases. Therefore, it is not preferable.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a heat source device that prevents freezing of circulating water and a hot water heating facility including the heat source device without providing a heater except for an expansion tank. And

The heat source device according to the first aspect of the present invention is an internal flow that forms a circulation circuit in which circulating water flows integrally with the external flow channel in the heat source device connected to the radiator via the external flow channel. A passage, a circulation pump provided in the internal flow path for flowing the circulating water in the circulation circuit, a temperature raising means for heating the circulating water, and a downstream side of the circulation pump in the internal flow path. A bypass pipe that guides the circulating water to the upstream side of the circulation pump of the internal flow path and an inflow / outflow part through which the circulating water enters and exits are directly connected to the bypass pipe to adjust the pressure in the circulation circuit. An expansion tank that has one end of the bypass pipe connected to one end of the internal flow path, the other end of the bypass pipe connected to the other end of the internal flow path, and the outflow The entrance is only between the one end and the other end of the bypass pipe. Is sintered, the circulation pump and actuates said heating means, said circulating water該昇the circulating water heated by the raising means to flow in the bypass pipe and in the circulation circuit by the circulating circuit and the bypass tube Prevent freezing.

In the heat source device according to the first aspect of the present invention, the piping resistance of the bypass pipe is larger at the upstream side from the position Q where the inflow / outflow portion of the expansion tank is connected to the bypass pipe than at the downstream side from the position Q. preferable.

In the heat source device according to the first aspect of the present invention, the heat source device has a top panel, and includes a housing that houses the expansion tank, the temperature raising means, the circulation pump, the internal flow path, and the bypass pipe. It is preferable that the temperature raising means and the circulation pump are arranged above the space provided, and the state is made visible by removing the top panel.

In the heat source device according to the first aspect of the present invention, it is preferable that all or part of the bypass pipe is a flexible pipe.

A hot water heating facility according to a second aspect of the present invention that meets the above-described object is a hot water heating facility that includes a radiator and a heat source device connected to the radiator via a flow path A, wherein the heat source device includes the flow path A flow path B that forms a circulation circuit through which the circulating water flows together with A, a circulation pump that is provided in the flow path B and flows the circulating water in the circulation circuit, and a riser that heats the circulating water A temperature means, a bypass pipe for guiding the circulating water on the downstream side of the circulating pump in the flow path B to the upstream side of the circulating pump in the flow path B, and an inflow / outflow portion for the circulating water to enter and exit, An expansion tank that directly connects to the bypass pipe and adjusts the pressure in the circulation circuit, and one end of the bypass pipe is connected to one end of the flow path B, and the other end of the bypass pipe Part is connected to the other end of the flow path B, and the inflow / outflow part is Only in the middle of one end and the other end of the bypass pipe is connected, the circulation pump and the operating Atsushi Nobori means, to flow through the circulation water heated by該昇raising means in the bypass pipe and in the circulation circuit Thus, freezing of the circulating water in the circulation circuit and the bypass pipe is prevented.

In the hot water heating facility according to the second aspect of the present invention, the piping resistance of the bypass pipe is greater on the upstream side from the position Q where the inflow / outflow portion of the expansion tank is connected to the bypass pipe than on the downstream side from the position Q. Is preferred.

In the heat source apparatus according to the first invention and the hot water heating facility according to the second invention, the circulating water on the downstream side of the circulation pump in the internal flow path (flow path B) is placed upstream of the circulation pump in the internal flow path. A bypass pipe for guiding and an inflow / outflow part through which circulating water enters and exits is directly connected to the bypass pipe, and has an expansion tank for adjusting the pressure in the circulation circuit, and operates the circulation pump and the temperature raising means to raise the temperature. Circulating water heated by the means is caused to flow in the circulation circuit and in the bypass pipe to prevent freezing of the circulating water in the circulation circuit and in the bypass pipe. Therefore, there is no pipe between which the circulating water does not flow when the circulation pump is operated between the expansion tank and the bypass pipe, and the freezing of the circulating water can be prevented without providing a heater except for the expansion tank. .

In the heat source apparatus according to the first invention and the hot water heating facility according to the second invention, one end of the bypass pipe is connected to one end of the internal flow path (flow path B), and the other end of the bypass pipe is Since it is connected to the other end of the internal flow path, when the circulation pump is operated in a state where the external flow path (flow path A) is closed and the circulating water does not flow in the external flow path, In addition, the circulating water flows in the entire inside of the internal flow path, or the entire inside of the bypass pipe and most of the internal flow path, and freezing can be prevented.

In the heat source device according to the first invention and the hot water heating facility according to the second invention, the piping resistance of the bypass pipe upstream from the position Q connecting the inflow / outflow portion of the expansion tank to the bypass pipe is When it is larger than the piping resistance of the bypass pipe, it is possible to stably perform pressure adjustment in the circulation circuit by the expansion tank and heat radiation by the radiator. This has been confirmed by experimental verification.

In the heat source device according to the first aspect of the present invention, in the case where the expansion tank is disposed above the space provided with the temperature raising means and the circulation pump and is in a state of being visually recognized by removing the top panel, Removal can be performed easily.

In the heat source device according to the first invention, when all or part of the bypass pipe is a flexible pipe, the expansion tank can be moved in a state where the expansion tank is connected to the bypass pipe, and the lower side of the expansion tank It is possible to easily remove and inspect the equipment and members in

1 is a circuit diagram of a heat source device according to an embodiment of the present invention. It is explanatory drawing which shows the flow of the circulating water and the heat medium at the time of heating operation and freezing prevention operation. It is explanatory drawing which shows the accommodation state of the expansion tank in a housing.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1, a heat source device 10 according to an embodiment of the present invention is a device connected to a radiator 16 via an external flow path 11 (flow path A). An internal flow path 13 (flow path B) that integrally forms a circulation circuit 12 through which the circulating water flows, a circulation pump 14 that causes the circulating water to flow in the circulation circuit 12, and a temperature raising means 15 that heats the circulating water, It has. Hereinafter, these will be described in detail.

As shown in FIG. 1, the temperature raising means 15 includes a heat medium circulation circuit 17 through which a heat medium (for example, Freon 410A) circulates, an expansion valve 18, an evaporator 19 and a compressor connected by the heat medium circulation circuit 17. 20 and a heat radiator 21.
The radiator 21 which is a heat exchanger is connected to the heat medium circulation circuit 17 and further connected to the internal flow path 13 through which the circulating water flows. The heat medium flowing in the heat medium circulation circuit 17 condenses when passing through the radiator 21 and heats the circulating water flowing in the internal flow path 13 by heating. When the heating medium circulating through the heating medium circulation circuit 17 is CO ₂ , the heating medium is sent to the radiator 21 in a supercritical fluid state and is sent from the radiator 21 in a supercritical fluid state. It does not condense when passing through the vessel 21.

As shown in FIG. 2, the heat medium that has passed through the radiator 21 goes to the expansion valve 18, passes through the expansion valve 18, expands, and then is sent to the evaporator 19 that is a heat exchanger.
The evaporator 19 exchanges heat between the heat medium passing through the evaporator 19 and the outside air. When passing through the evaporator 19, the heat medium absorbs heat from the outside air and evaporates into a gaseous state, and is sent out from the evaporator 19. As shown in FIG. 1, a propeller fan 22 that promotes evaporation of the heat medium is provided in the vicinity of the evaporator 19, and external air is supplied to the evaporator 19 by the operation of the propeller fan 22.

An accumulator 23 that removes the liquid heat medium from the gas-liquid mixed heat medium is attached to the heat medium circulation circuit 17 on the downstream side of the evaporator 19 and the upstream side of the compressor 20. When the evaporation in the evaporator 19 gradually proceeds, the heat medium exits the evaporator 19 in a gas-liquid mixed state in which gas and liquid are mixed.
The accumulator 23 removes the liquid heat medium from the gas-liquid mixed state heat medium when the gas-liquid mixed state heat medium flows into the accumulator 23 so that only the gaseous heat medium is supplied to the compressor 20. To. The liquid heat medium stored in the accumulator 23 evaporates with time and becomes gaseous, and is supplied to the compressor 20.

As shown in FIG. 2, the heat medium sent to the compressor 20 is compressed by the compressor 20 to be in a high temperature and high pressure state, sent to the radiator 21, and heats the circulating water circulating in the circulation circuit 12. To do.
The compressor 20 is inverter-controlled and adjusts the operating frequency by changing the output value of the inverter. The ability of the heat medium supplied to the radiator 21 to heat the circulating water flowing through the internal flow path 13 increases as the operating frequency of the compressor 20 increases and decreases as the operating frequency of the compressor 20 decreases.
The heat medium in the heat medium circuit 17 flows in the heat medium circuit 17 when the compressor 20 operates.

As shown in FIG. 1, a control unit 24 connected to the expansion valve 18 and the propeller fan 22 is connected to the compressor 20. The compressor 20 changes the output value of the inverter and raises or lowers the operation frequency in accordance with a command signal transmitted from the control unit 24 to the compressor 20.
The control unit 24 is constituted by, for example, a microcomputer and is loaded with various programs including a program for determining the operating frequency of the compressor 20.

The internal flow path 13 connected to the radiator 21 includes a temperature raising means 15 (that is, a heat medium circulation circuit 17, an expansion valve 18, an evaporator 19, a propeller fan 22, a compressor 20, an accumulator 23, and a radiator 21) and Together with the control unit 24, the housing 25 is accommodated.
Both the internal flow path 13 and the external flow path 11 have ends, and connectors 26 and 27 are attached to both ends of the internal flow path 13, and both ends of the internal flow path 13 are connected to the external flow path 11. Connected to both ends. The internal flow path 13 is connected to the external flow path 11 disposed outside the housing 25, and forms a circulation circuit 12 in which the circulating water circulates integrally with the external flow path 11.

A circulation pump 14 is attached to the internal flow path 13, and the circulating water in the circulation circuit 12 flows in the circulation circuit 12 by the operation of the circulation pump 14. In the present embodiment, along the flow of the circulating water in the circulation circuit 12, the radiator 21 is upstream of the connection tool 26, the circulation pump 14 is upstream of the radiator 21, and the upstream of the circulation pump 14. A connector 27 is arranged on the side.
The external flow path 11 is provided with a radiator 16 used as a heating panel, and the circulating water heated through the radiator 21 is sent to the radiator 16 and passes through the radiator 16. Dissipate heat.
The radiator 16 is used for floor heating that warms the floor by being installed under the floor, and is used as a heater that warms indoor air by being erected on the floor.

In the internal flow path 13, temperature sensors 28 and 28 a are provided on the upstream side of the circulation pump 14 and the downstream side of the radiator 21, respectively. The temperature sensors 28 and 28 a are connected to the control unit 24 together with the circulation pump 14. The control unit 24 detects the temperature of the circulating water whose temperature has dropped through the radiator 16 via the temperature sensor 28, and uses the temperature sensor 28a to detect the temperature of the circulating water whose temperature has increased through the radiator 21. To detect through.
The control unit 24 determines the operating frequency of the compressor 20 based on the result of comparing the heating temperature set by an input operation from an operation panel (not shown) and the measured temperature of the temperature sensor 28a, and measures the temperature sensor 28a. Bring the temperature closer to the heating temperature.

A bypass pipe 29 is connected to the internal flow path 13 so that the circulation pump 14 can continue to supply the circulating water even when the external flow path 11 is closed.
In the present embodiment, the bypass pipe 29 has one end 29 a connected to one end of the internal flow path 13 and the other end 29 b connected to the other end of the internal flow path 13.
The connection position of the bypass pipe 29 to the internal flow path 13 is not limited to this, and one end 29a of the bypass pipe 29 is connected to the internal flow path 13 on the downstream side of the circulation pump 14 and the other end of the bypass pipe 29 is connected. 29 b may be connected to the internal flow path 13 on the upstream side of the circulation pump 14 to guide the circulating water on the downstream side of the circulation pump 14 to the upstream side of the circulation pump 14. For example, one end 29 a of the bypass pipe 29 is connected to the internal flow path 13 between the circulation pump 14 and the radiator 21, and the other end 29 b of the bypass pipe 29 is connected to the internal flow path between the temperature sensor 28 and the circulation pump 14. 13 can also be connected.

Although not shown in FIG. 1, the external flow path 11 is provided with an open / close valve that closes the external flow path 11 and prevents the circulating water in the external flow path 11 from flowing. When the circulating pump 14 is operated with this on-off valve closed, the circulating water sent out from the circulating pump 14 returns to the circulating pump 14 via the radiator 21 and the bypass pipe 29, so that the circulating pump 14 The circulating water can continue to be sent.
If the circulation pump 14 continues to operate in a state where the circulating water cannot be sent out, there is a risk that the temperature rises and a malfunction occurs. Therefore, by providing the bypass pipe 29, it is possible to prevent the circulation pump 14 from malfunctioning even if the circulation pump 14 continues to operate even in a state where the circulation water cannot be sent out to the external flow path 11.

The circulation pump 14 and the compressor 20 operate at the time of heating operation, and circulate circulating water in the circulation circuit 12 and circulate the heat medium in the heat medium circulation circuit 17 as shown in FIG. By doing in this way, the heat medium circulating in the heat medium circuit 17 continuously heats the circulating water passing through the radiator 21, and the circulation pump 14 is heated and circulated through the radiator 21. Water can be continuously supplied to the radiator 16.
During the heating operation, in addition to the circulation circuit 12, the circulating water heated through the radiator 21 flows through the bypass pipe 29, and the circulating water that has passed through the radiator 21 is one end of the bypass pipe 29. It is sent from the part 29a toward the other end part 29b.

Further, as shown in FIG. 1, an expansion tank 30 that adjusts the pressure in the circulation circuit 12 is attached to the bypass pipe 29.
The volume of the circulating water increases / decreases due to the temperature change of the circulating water, and the pressure in the circulation circuit 12 varies as the volume of the circulating water increases / decreases. The expansion tank 30 absorbs the increase / decrease in the volume of the circulating water, maintains the pressure in the circulation circuit 12 within a predetermined range, and prevents the members constituting the circulation circuit 12 from being damaged.

The expansion tank 30 includes an inflow / outflow portion 30 a through which circulating water enters and exits, and the inflow / outflow portion 30 a is directly connected to the bypass pipe 29. That is, the expansion tank 30 is directly connected to the bypass pipe 29 without using a connecting pipe such as a rubber hose.
When the circulating water in the circulation circuit 12 expands, the circulating water in the bypass pipe 29 flows into the expansion tank 30 via the inflow / outflow portion 30a, and when the circulating water in the circulation circuit 12 contracts, it accumulates in the expansion tank 30. Since the circulating water that has been supplied is sent to the bypass pipe 29 through the inflow / outflow portion 30a, the pressure in the circulation circuit 12 and the bypass pipe 29 is kept within a predetermined range.

A heater 31 is attached to the expansion tank 30 to prevent the circulating water stored in the expansion tank 30 from freezing due to a decrease in the outside air temperature. The heater 31 is connected to the control unit 24 and starts operating in response to a command signal transmitted from the control unit 24.
A temperature sensor 32 that measures the outside air temperature is connected to the control unit 24, and the control unit 24 detects when the outside air temperature detected via the temperature sensor 32 is equal to or lower than a predetermined temperature (2 ° C. in the present embodiment). Then, the heater 31 is operated.
The heater 31 and the temperature sensor 32 are disposed in the housing 25 together with the circulation pump 14, the temperature sensors 28 and 28 a, the bypass pipe 29 and the expansion tank 30.

In the present embodiment, the temperature raising means 15 is mainly composed of a heat medium circulation circuit 17, an expansion valve 18, an evaporator 19, a propeller fan 22, a compressor 20, an accumulator 23, and a radiator 21, and the heat source device 10 is Primarily constituted by the temperature raising means 15, the internal flow path 13, the circulation pump 14, the control unit 24, the bypass pipe 29, the expansion tank 30, the heater 31, the housing 25, the connecting tools 26 and 27, and the temperature sensors 28, 28a and 32. Has been.
The hot water heating facility 40 is mainly configured by the heat source device 10, the external flow path 11, and the radiator 16.

Further, in a state where the heating operation is not performed, that is, in a state where the circulating water heated by the temperature raising means 15 is not flowing in the circulation circuit 12 and the bypass pipe 29, the outside air temperature is a predetermined temperature (for example, 0 C.), the circulating water in the circulation circuit 12 and the bypass pipe 29 may freeze.
Therefore, the control unit 24 is configured so that the outside air temperature measured by the temperature sensor 32 is equal to or lower than a predetermined temperature T1 (in this embodiment, temperature T1 = 2 ° C.) in a state where the heating operation is not performed. When detected, the freeze prevention operation is started to prevent the circulating water in the circulation circuit 12 and the bypass pipe 29 from being frozen.

The freeze prevention operation is performed by operating the circulation pump 14 and the temperature raising means 15.
When the control unit 24 detects that the temperature measured by the temperature sensor 32 is equal to or lower than the temperature T1, the control unit 24 operates the circulation pump 14, the compressor 20, and the propeller fan 22, and as shown in FIG. The circulating water in the bypass pipe 29 and the heating medium in the heating medium circulation circuit 17 are caused to flow.
The compressor 20 operates at a minimum operating frequency so as to suppress power consumption during the freeze prevention operation.

Since the circulating water heated by the radiator 21 flows in the circulation circuit 12 and the bypass pipe 29 by the operation of the circulation pump 14, the compressor 20 and the propeller fan 22, the circulating water in the circulation circuit 12 and the bypass pipe 29 is Freezing can be prevented.
The freeze prevention operation is continued until the temperature detected by the temperature sensor 28a reaches a predetermined temperature T2 (in this embodiment, temperature T2 = 4 ° C.). In addition, the method for preventing freezing of the circulating water in the circulation circuit 12 and the bypass pipe 29 is not limited to what was described in this Embodiment.

Here, since the inflow / outflow portion 30 a of the expansion tank 30 is directly connected to the bypass pipe 29, the circulating water is excluded from the bypass pipe 29 except that stored in the expansion tank 30 during the freeze prevention operation. Or it flows through the circulation circuit 12, passes the heat radiator 21, and is heated.
Since the circulating water in the expansion tank 30 is heated by the heater 31, all the circulating water (that is, the circulating water in the expansion tank 30, the circulating water flowing in the circulation circuit 12 and the bypass pipe 29 flows). Circulating water) is in a state where freezing is prevented.

On the other hand, if the expansion tank 30 is connected to the bypass pipe 29 or the internal flow path 13 through the connecting pipe, the circulating water in the connecting pipe stays on the spot during the freeze prevention operation ( It does not flow) and is not heated by the radiator 21 and may freeze.
Further, the bypass pipe 29 has one end 29 a connected to one end of the internal flow path 13 and the other end 29 b connected to the other end of the internal flow path 13. Is closed and the circulating water cannot flow through the external flow path 11, the freeze prevention operation frees at least all the circulating water in the internal flow path 13 and all the circulating water in the bypass pipe 29. Can be prevented.

With the position where the inflow / outflow part 30a of the expansion tank 30 is connected to the bypass pipe 29 as a position Q, the pipe resistance of the bypass pipe 29 is the position Q along the flow of circulating water in the bypass pipe 29 at the upstream side of the position Q. Larger than the downstream side.
By making the piping resistance of the bypass pipe 29 in this way, at the time of heating operation, most of the circulating water that has passed through the radiator 21 can be directed to the radiator 16 without being directed to the bypass pipe 29, and It has been confirmed by experimental examination that the expansion tank 30 can stably maintain the pressure in the circulation circuit 12 within a predetermined range. If the amount of circulating water heated by the radiator 21 flows into the bypass pipe 29 increases, the heating efficiency by the radiator 16 decreases, so the amount of circulating water flowing into the bypass pipe 29 is reduced during heating operation. Is desirable.

In the present embodiment, the position Q is located between the one end 29a and the other end 29b of the bypass pipe 29, and the inner diameter R1 (R1 is 1 mm or more and 3 mm or less) of the one end 29a of the bypass pipe 29 is set to the bypass pipe 29. The pipe resistance on the upstream side of the position Q of the bypass pipe 29 is larger than the pipe resistance on the downstream side of the position Q of the bypass pipe 29 by making it thinner than the inner diameter R2 (R2 is 3 mm or more and 5 mm or less) of the other end portion 29b. However, it is not limited to this. For example, the inner diameter of the bypass pipe 29 is made equal and the position Q is arranged downstream of the bypass pipe 29, and the pipe resistance upstream of the position Q of the bypass pipe 29 is reduced to the downstream side of the position Q of the bypass pipe 29. It may be made larger than the pipe resistance.

Further, as shown in FIG. 3, the housing 25 includes an upper surface panel 33, and the housing 25 has an upper open type above the space where the temperature raising means 15, the circulation pump 14, and the internal flow path 13 are provided. A tank container 34 is arranged.
The expansion tank 30 is housed in the housing 25 in a state of being accommodated in the tank container 34 and is disposed above the space where the temperature raising means 15, the circulation pump 14, and the internal flow path 13 are provided. Since the entire expansion tank 30 is visible from above when the top panel 33 is removed, removing the top panel 33 removes the expansion tank 30 from the casing 25 and within the casing 25 of the expansion tank 30. Can be easily installed.

In FIG. 3, items stored in the housing 25 are omitted except for the expansion tank 30, the tank container 34, and the evaporator 19.
Since the bypass pipe 29 is partly or entirely a flexible pipe (in this embodiment, a rubber hose), the expansion tank 30 can be moved with the bypass pipe 29 attached to the expansion tank 30. Therefore, the operator can move the expansion tank 30 in a state where the expansion tank 30 is connected to the bypass pipe 29, and remove or inspect equipment and members below the expansion tank 30. The flexible tube is not limited to a rubber hose, and may be a metal flexible tube.

The expansion tank 30 is connected to the bypass pipe 29 at the time of shipment from the factory, and is shipped from the factory while being accommodated in the housing 25. Some expansion tanks are externally attached to the external flow path, but the external type requires installation work at the site where the hot water heating equipment is installed, and the time required to install the hot water heating equipment become longer.
The outside air supply port for supplying the outside air to the evaporator is generally provided in the side wall portion of the housing. When the expansion tank is disposed on the outside of the housing and attached to the side wall portion of the housing, This is not preferable because the formation position of the outside air supply port is limited.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, the temperature raising means for heating the circulating water may be a combustion burner.
Further, the radiator is not limited to a heating panel, and may be a heat exchanger that is provided in a hot water storage tank and boils water in the hot water storage tank.

10: heat source device, 11: external flow path, 12: circulation circuit, 13: internal flow path, 14: circulation pump, 15: temperature raising means, 16: radiator, 17: heat medium circulation circuit, 18: expansion valve, 19: evaporator, 20: compressor, 21: radiator, 22: propeller fan, 23: accumulator, 24: controller, 25: housing, 26, 27: connector, 28, 28a: temperature sensor, 29: bypass Pipe, 29a: one end, 29b: other end, 30: expansion tank, 30a: inflow / outflow part, 31: heater, 32: temperature sensor, 33: top panel, 34: container for tank, 40: hot water heating equipment

Claims (6)

In the heat source device connected to the radiator via the external flow path,
An internal flow path that forms a circulation circuit through which circulating water flows together with the external flow path;
A circulation pump which is provided in the internal flow path and causes the circulating water to flow in the circulation circuit;
A temperature raising means for heating the circulating water;
A bypass pipe that guides the circulating water downstream of the circulation pump in the internal flow path to the upstream side of the circulation pump of the internal flow path;
An inflow / outflow part through which the circulating water enters and exits is directly connected to the bypass pipe, and has an expansion tank for adjusting the pressure in the circulation circuit,
One end of the bypass pipe is connected to one end of the internal flow path, the other end of the bypass pipe is connected to the other end of the internal flow path, and the inflow / outflow part is one end of the bypass pipe. Connected only between the middle and the other end,
The circulating pump and the temperature raising means are operated, and the circulating water heated by the temperature raising means is caused to flow in the circulation circuit and the bypass pipe to freeze the circulating water in the circulation circuit and the bypass pipe. A heat source device characterized by preventing. 2. The heat source device according to claim 1, wherein a pipe resistance of the bypass pipe is larger at an upstream side from a position Q where an inflow / outflow portion of the expansion tank is connected to the bypass pipe than at a downstream side from the position Q. Heat source device. The heat source device according to claim 1 or 2 , further comprising: a housing having a top panel, and housing the expansion tank, the temperature raising means, the circulation pump, the internal flow path, and the bypass pipe, A heat source device, wherein the heat source device is disposed above a space in which the temperature raising means and the circulation pump are provided, and is visible by removing the top panel. In the heat source apparatus according to any one of claims 1 to 3, wherein the bypass tube is a heat source and wherein the whole or a part is flexible tube. In a hot water heating facility comprising a radiator and a heat source device connected to the radiator via a flow path A,
The heat source device is
A flow path B that forms a circulation circuit through which the circulating water flows together with the flow path A;
A circulation pump which is provided in the flow path B and allows the circulating water to flow in the circulation circuit;
A temperature raising means for heating the circulating water;
A bypass pipe for guiding the circulating water downstream of the circulation pump in the flow path B to the upstream side of the circulation pump of the flow path B;
An inflow / outflow part through which the circulating water enters and exits is directly connected to the bypass pipe, and has an expansion tank for adjusting the pressure in the circulation circuit,
One end of the bypass pipe is connected to one end of the flow path B, the other end of the bypass pipe is connected to the other end of the flow path B, and the inflow / outflow part is one end of the bypass pipe. Connected only between the middle and the other end,
The circulating pump and the temperature raising means are operated, and the circulating water heated by the temperature raising means is caused to flow in the circulation circuit and the bypass pipe to freeze the circulating water in the circulation circuit and the bypass pipe. Hot water heating facility characterized by preventing. 6. The hot water heating facility according to claim 5 , wherein the pipe resistance of the bypass pipe is larger at the upstream side from the position Q where the inflow / outflow portion of the expansion tank is connected to the bypass pipe than at the downstream side from the position Q. Characteristic hot water heating equipment.

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