Cooling / heating system

Abstract

To provide a cooling / heating system that can enhance durability of a compressor.SOLUTION: A cooling / heating system 1 comprises: a compressor for compressing fluid; a condenser for condensing the fluid compressed by the compressor; an expansion valve for expanding the fluid condensed by the condenser; an evaporator for evaporating the fluid expanded in the expansion valve, and sending it to the compressor; and a heat exchanger 20 comprising a first flow passage 41 through which the fluid sent from the condenser flows, and a second flow passage 42 through which the fluid sent from the evaporator flows, and for exchanging heat between the fluid flowing through the first flow passage 41, and the fluid flowing through the second flow passage 42. The heat exchanger 20 comprises an approaching / separating mechanism 50 for making the first flow passage 41 and the second flow passage 42 approach or separate from each other in accordance with the temperature of the fluid flowing through the first flow passage 41.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a heating and cooling system for performing heating and cooling. [Background technology]

[0002] An example of the above-mentioned heating and cooling system is a vehicle air conditioner described in Patent Document 1. This vehicle air conditioner includes a compressor, a condenser that condenses the refrigerant compressed by the compressor, an expansion valve that decompresses the refrigerant condensed by the condenser, an evaporator that evaporates the decompressed refrigerant, and a double-pipe heat exchanger that has a high-temperature side refrigerant passage and a low-temperature side refrigerant passage and exchanges heat between a high-temperature, high-pressure refrigerant that flows out of the condenser and flows through the high-temperature side refrigerant passage and a low-temperature, low-pressure refrigerant that flows out of the evaporator and flows through the low-temperature side refrigerant passage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-22601 Summary of the Invention [Problem to be solved by the invention]

[0004] In the vehicle air conditioning system described in Patent Document 1, if the amount of heat transferred from the high-temperature, high-pressure refrigerant flowing from the condenser through the high-temperature refrigerant passage to the low-temperature, low-pressure refrigerant flowing from the evaporator through the low-temperature refrigerant passage is greater than expected, the temperature of the refrigerant introduced into the compressor increases, which can cause the compressor temperature to increase, degrade the lubricating oil in the compressor, and shorten the compressor's lifespan.

[0005] Therefore, there is a demand for a heating and cooling system that can improve the durability of the compressor. [Means for solving the problem]

[0006] A characteristic configuration of the heating and cooling system of the present invention is that it includes a compressor that compresses a fluid, a condenser that condenses the fluid compressed by the compressor, an expansion valve that expands the fluid condensed by the condenser, an evaporator that evaporates the fluid expanded in the expansion valve and sends it to the compressor, and a heat exchanger that has a first flow path through which the fluid sent out from the condenser flows and a second flow path through which the fluid sent out from the evaporator flows, and that exchanges heat between the fluid flowing through the first flow path and the fluid flowing through the second flow path, and the heat exchanger has a proximity / separation mechanism that moves the first flow path and the second flow path closer to or farther from each other depending on the temperature of the fluid flowing through the first flow path.

[0007] With this characteristic configuration, when the proximity / separation mechanism brings the first flow path and the second flow path closer together, heat exchange between the fluid flowing through the first flow path and the fluid flowing through the second flow path is promoted, thereby improving the operating efficiency of the heating and cooling system. On the other hand, when the proximity / separation mechanism separates the first flow path and the second flow path, heat exchange between the fluid flowing through the first flow path and the fluid flowing through the second flow path is suppressed, preventing the temperature of the fluid introduced into the compressor from becoming too high. Therefore, excessive temperature increases inside the compressor can be prevented, making it possible to make the lubricating oil inside the compressor less susceptible to deterioration. In this way, the heating and cooling system is able to increase the durability of the compressor. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a circuit diagram of the heating and cooling system. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 10 is a view showing a heat exchanger according to another embodiment. [Figure 5] FIG. 10 is a view showing a heat exchanger according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The heating and cooling system according to the present invention is configured to be able to perform heating and cooling. Hereinafter, a heating and cooling system 1 of this embodiment will be described. However, the heating and cooling system is not limited to the following embodiment, and various modifications are possible within the scope of the gist thereof.

[0010] FIG. 1 is a diagram showing the circuit configuration of a heating and cooling system 1. The heating and cooling system 1 is mounted on a vehicle, and as shown in FIG. 1, comprises a refrigerant module B, a coolant module C, and an HVAC (Heating, Ventilation, and Air Conditioning) unit D. The refrigerant module B is provided with a refrigerant passage B1, which constitutes a refrigerant manifold. The coolant module C is provided with a coolant passage C1, which constitutes a coolant manifold. Here, the manifold is a passage housing formed by laminating and sealing a plate member on a housing main body in which the coolant passage C1 and the coolant passage B1 are machined or cast. The passage housing is formed from a metal material with high thermal conductivity, including aluminum.

[0011] A refrigerant (an example of a "fluid") such as hydrofluorocarbon (HFC) or hydrofluoroolefin (HFO) flows through the refrigerant path B1, and a coolant flow path C1 carries a coolant such as antifreeze or long-life coolant whose main ingredient is ethylene glycol, or a paraffin-based insulating oil.

[0012] The heating and cooling system 1 includes an accumulator 10, a compressor 11 (an example of a "compressor"), a water-cooled condenser 12 (an example of a "condenser"), an expansion valve 13, an evaporator 14 (an example of an "evaporator"), and a heat exchanger 20. The heating and cooling system 1 is configured so that a refrigerant can flow between the accumulator 10, the compressor 11, the water-cooled condenser 12, the expansion valve 13, the evaporator 14, and the heat exchanger 20 via a refrigerant path B1. Furthermore, the water-cooled condenser 12 is configured so that a coolant can flow through a coolant path C1.

[0013] The accumulator 10 stores a liquid refrigerant and separates the stored refrigerant into gas and liquid. The gas refrigerant separated by the accumulator 10 flows through a first refrigerant passage 21 and is sent to the compressor 11.

[0014] The compressor 11 compresses the refrigerant from the accumulator 10. As a result, the refrigerant becomes a high-temperature compressed gas. The compressor 11 sends this high-temperature compressed gas to the water-cooled condenser 12 via the second refrigerant path 22. Therefore, the compressor 11 pressure-feeds the refrigerant from the accumulator 10 to the water-cooled condenser 12.

[0015] The water-cooled condenser 12 condenses the refrigerant compressed by the compressor 11. The water-cooled condenser 12 is configured so that the coolant flows in through a first coolant flow path 31 and flows out through a second coolant flow path 32. The first coolant flow path 31 and the second coolant flow path 32 are configured separately from the second coolant flow path 22. The refrigerant from the second coolant flow path 22 is condensed and liquefied as heat is absorbed by the coolant. The liquefied refrigerant is sent to the third coolant flow path 23. Like the second coolant flow path 22, this third coolant flow path 23 is also configured separately from the first coolant flow path 31 and the second coolant flow path 32. The water-cooled condenser 12 may be an air-cooled condenser (not shown, an example of a "condenser") provided near a radiator.

[0016] The expansion valve 13 expands the refrigerant condensed by the water-cooled condenser 12. In the expansion valve 13, the refrigerant (liquefied refrigerant) flowing through the third refrigerant passage 23 is expanded and converted into a low-temperature, low-pressure mist. The mist-like refrigerant is sent to the fourth refrigerant passage 24.

[0017] The evaporator 14 evaporates the refrigerant expanded in the expansion valve 13 and sends it to the compressor 11. The refrigerant flows through the evaporator 14 via a fourth refrigerant passage 24. As described above, the refrigerant expanded by the expansion valve 13 and converted into a low-temperature, low-pressure atomized refrigerant flows through the fourth refrigerant passage 24, and this refrigerant is sent to the evaporator 14. In the evaporator 14, the atomized refrigerant absorbs heat from, for example, outside air and evaporates. The evaporated refrigerant flows through a fifth refrigerant passage 25 to the accumulator 10.

[0018] The HVAC unit D includes a blower (not shown) together with the evaporator 14. The blower draws in outside air and sends the drawn outside air to the evaporator 14.

[0019] The evaporator 14 exchanges heat between outside air and a refrigerant to cool the vehicle interior. Outside air is drawn in by a blower. In the evaporator 14, heat exchange occurs between the outside air sent from the blower and the refrigerant supplied via the fourth refrigerant passage 24, and the air after the heat exchange is introduced into the vehicle interior. Specifically, the outside air is cooled in the evaporator 14, and cool air is introduced into the vehicle interior. This makes it possible to cool the vehicle interior.

[0020] In the evaporator 14, the refrigerant sent from the expansion valve 13 is circulated through the evaporator 14 to cool the evaporator 14 and its surroundings, thereby enhancing the cooling effect. After circulating through the evaporator 14, the refrigerant is heated by the evaporator 14.

[0021] The heat exchanger 20 has a first flow path 41 through which the refrigerant discharged from the water-cooled condenser 12 flows and a second flow path 42 through which the refrigerant discharged from the evaporator 14 flows. The refrigerant discharged from the water-cooled condenser 12 is sent to the expansion valve 13 via a third refrigerant path 23. The first flow path 41 is provided in the third refrigerant path 23 between the water-cooled condenser 12 and the expansion valve 13. That is, the refrigerant discharged from the water-cooled condenser 12 flows through the first flow path 41 via the third refrigerant path 23, and then flows to the expansion valve 13 via the third refrigerant path 23. On the other hand, the refrigerant discharged from the evaporator 14 is sent to the accumulator 10 via a fifth refrigerant path 25, and then sent to the compressor 11 via the first refrigerant path 21. The second flow path 42 is provided in the first refrigerant path 21 between the accumulator 10 and the compressor 11. Therefore, the refrigerant sent from the accumulator 10 flows through the second flow path 42 via the first refrigerant path 21, and further flows to the compressor 11 via the first refrigerant path 21. The accumulator 10 may be provided between the heat exchanger 20 and the compressor 11.

[0022] The heat exchanger 20 exchanges heat between the refrigerant flowing through the first flow path 41 and the refrigerant flowing through the second flow path 42. A serpentine flow path is formed inside the heat exchanger 20, with the first flow path 41 and the second flow path 42 turning back and forth multiple times so that they face each other. The refrigerant flowing through the first flow path 41 is the refrigerant that has been condensed and liquefied in the water-cooled condenser 12. The refrigerant flowing through the second flow path 42 is the refrigerant that has evaporated and vaporized in the evaporator 14. The refrigerant flowing through the first flow path 41 has a relatively high temperature, and is higher in temperature than the refrigerant flowing through the second flow path 42. Therefore, the heat exchanger 20 exchanges heat between the refrigerant that has condensed and liquefied in the water-cooled condenser 12 and the refrigerant that has evaporated and vaporized in the evaporator 14.

[0023] The heat exchanger 20 includes a proximity / separation mechanism 50 that moves the first flow path 41 and the second flow path 42 toward or away from each other depending on the temperature of the refrigerant flowing through the first flow path 41. FIG. 2 shows a cross-sectional view of the heat exchanger 20. For ease of understanding, coordinate axes indicating the X, Y, and Z directions are shown in FIG. 2 (note that the X, Y, and Z directions are perpendicular to each other). As shown in FIG. 2, the heat exchanger 20 includes a first housing 61 that includes the first flow path 41 and a second housing 62 that includes the second flow path 42. The first housing 61 and the second housing 62 are made of a metal such as aluminum, and the first flow path 41 and the second flow path 42 are provided therein. The first housing 61 and the second housing 62 are disposed opposite each other along the Z direction. The first flow path 41 and the second flow path 42 extend along the Y direction.

[0024] The approaching / separating mechanism 50 is provided between the first housing 61 and the second housing 62. The approaching / separating mechanism 50 includes a heat transfer block 51, a shape memory alloy 52, a support portion 53, and a guide portion 54. The heat transfer block 51 is provided between the first housing 61 and the second housing 62. The heat transfer block 51 is formed in an annular shape using a metal such as aluminum. In this embodiment, the heat transfer block 51 is provided integrally with the second housing 62. "Provided integrally" includes both fastening the heat transfer block 51 to the second housing 62 with screws and forming the second housing 62 and the heat transfer block 51 integrally.

[0025] The shape memory alloy 52 expands depending on the temperature of the refrigerant flowing through the first flow path 41. As described above, the annular heat transfer block 51 is provided between the first housing 61 and the second housing 62. The shape memory alloy 52 is provided in the hollow portion of the annular heat transfer block 51. In this embodiment, the shape memory alloy 52 is configured as a compression coil spring. The refrigerant flowing through the first flow path 41 exchanges heat with the refrigerant flowing through the second flow path 42 via the heat transfer block 51, and the heat transfer block 51 and the shape memory alloy 52 reach temperatures corresponding to the heat exchange. At this time, when the temperature of the shape memory alloy 52 reaches a predetermined value (a set value for the shape memory alloy 52), the compression coil spring constituting the shape memory alloy 52 expands as shown in FIG. 3. Here, in this embodiment, the second housing 62 is fixed to a support member by a fixture (not shown). As a result, the first housing 61 moves away from (away from) the second housing 62. Therefore, an air layer is formed between the first housing 61 and the second housing 62, and this air layer suppresses heat transfer from one of the first housing 61 and the second housing 62 to the other.

[0026] The support portion 53 supports the expansion and contraction of the compression coil spring that constitutes the shape memory alloy 52. ​​In this embodiment, the support portion 53 is a rod-shaped body formed using resin and is attached to the first housing 61. The support portion 53 is provided along the Z direction at the radial center of the compression coil spring. This allows the compression coil spring that constitutes the shape memory alloy 52 to expand along the Z direction in response to temperature, allowing the first housing 61 to move along the Z direction relative to the second housing 62. In the state of FIG. 3, when the temperature of the shape memory alloy 52 falls below a predetermined value (a set value in the shape memory alloy 52), the compression coil spring contracts due to the weight of the first housing 61, and the first housing 61 moves toward the second housing 62, returning to the state of FIG. 2.

[0027] The guide portion 54 is made of a material with a thermal conductivity lower than that of the heat transfer block 51, and guides the relative movement between the first housing 61 and the second housing 62. As described above, the heat transfer block 51 is made of a metal such as aluminum. Therefore, the guide portion 54 can be made of a resin with a thermal conductivity lower than that of aluminum. In this embodiment, the guide portion 54 is provided on one side surface of the first housing 61 and the second housing 62 along the X direction.

[0028] In this embodiment, the guide portion 54 includes a first pin 71, a second pin 72, and a frame body 73. The first pin 71 is fixed to the first housing 61 by a screw 71A, and the second pin 72 is fixed to the second housing 62 by a screw 72A. The frame body 73 has an opening 73A extending along the Z direction in its central portion along the Y direction when viewed from the X direction. The first pin 71 and the second pin 72 are disposed in this opening 73A. This allows the first pin 71 to slide along the Z direction within the opening 73A in response to expansion and contraction of the shape memory alloy 52, thereby guiding the relative movement between the first housing 61 and the second housing 62.

[0029] Other Embodiments Next, other embodiments of the cooling and heating system 1 will be described.

[0030] In the above embodiment, the approaching / separating mechanism 50 has been described as including, between the first housing 61 and the second housing 62, a shape memory alloy 52 that expands in response to the temperature of the fluid flowing through the first flow path 41. However, the approaching / separating mechanism 50 may also be configured to include, between the first housing 61 and the second housing 62, a bimetal 82 whose deformation amount changes in response to the temperature of the fluid flowing through the first flow path 41.

[0031] 4 shows a cross-sectional view of the heat exchanger 20 including the bimetal 82. The heat exchanger 20 including the bimetal 82 has the same configuration as the heat exchanger 20 including the shape memory alloy 52, except for the proximity / separation mechanism 50. The following description will focus on the proximity / separation mechanism 50.

[0032] 4, the heat exchanger 20 also has a first housing 61 including the first flow path 41 and a second housing 62 including the second flow path 42. The first housing 61 and the second housing 62 are made of a metal such as aluminum, and the first flow path 41 and the second flow path 42 are provided inside them, respectively.

[0033] The approaching and separating mechanism 50 includes a heat transfer block 51, a bimetal 82, a push rod 83, and a guide portion 54. The heat transfer block 51 is provided between a first housing 61 and a second housing 62. The heat transfer block 51 is made of a metal such as aluminum and has an annular shape, and is provided between the first housing 61 and the second housing 62.

[0034] The bimetal 82 is formed by bonding together multiple (two in this example) metal plates 82A and 82B with different thermal expansion coefficients. In the example of FIG. 4, the metal plate 82A is made of a material with a higher thermal expansion coefficient than the metal plate 82B. Therefore, when the temperature of the bimetal 82 reaches a predetermined value (the set value for the bimetal 82), the bimetal 82 deforms and protrudes toward the second housing 62, as shown in FIG. 5. This causes the first housing 61 to move away from (away from) the second housing 62. Therefore, an air layer is formed between the first housing 61 and the second housing 62, and this air layer suppresses heat transfer from one of the first housing 61 and the second housing 62 to the other.

[0035] The push rod 83 is attached across the metal plate 82A of the bimetal 82 and the second housing 62, and lifts the first housing 61 in the Z direction in response to deformation of the bimetal 82. The push rod 83 is a rod-shaped body made of resin. The push rod 83 is provided so as to push out the protruding end of the bimetal 82 in the Z direction. This makes it possible to move the first housing 61 relative to the second housing 62 in the Z direction. When the temperature of the bimetal 82 drops below a predetermined value (the set value for the bimetal 82) in the state shown in FIG. 5, the amount of deformation of the bimetal 82 decreases, and the first housing 61 moves toward the second housing 62 under its own weight, returning to the state shown in FIG. 4.

[0036] In the above embodiment, the approach / separation mechanism 50 has been described as including the heat transfer block 51 and the guide portion 54. However, the approach / separation mechanism 50 may be configured without at least one of the heat transfer block 51 and the guide portion 54.

[0037] In the above embodiment, the heat exchanger 20 has been described as having the second housing 62 fixed to a support member by a fixture, and the first housing 61 moving away from the second housing 62. However, the heat exchanger 20 can also be configured such that the first housing 61 is fixed to a support member by a fixture, and the second housing 62 moves away from the first housing 61.

[0038] 2 to 5, the first housing 61 is provided above along the Z direction, and the second housing 62 is provided below along the Z direction. However, it is also possible to provide the second housing 62 above along the Z direction, and the first housing 61 below along the Z direction.

[0039] In the above embodiment, heat transfer block 51 is described as being configured integrally with second housing 62. However, heat transfer block 51 may be configured as a separate body from first housing 61.

[0040] [Summary of the above embodiment] An outline of the cooling and heating system 1 described above will now be described.

[0041] (1) The heating and cooling system 1 includes a compressor 11 that compresses a refrigerant (fluid), a water-cooled condenser 12 that condenses the refrigerant compressed by the compressor 11, an expansion valve 13 that expands the refrigerant condensed by the water-cooled condenser 12, an evaporator 14 that evaporates the expanded refrigerant in the expansion valve 13 and sends it to the compressor 11, and a heat exchanger 20 that has a first flow path 41 through which the refrigerant sent from the water-cooled condenser 12 flows and a second flow path 42 through which the refrigerant sent from the evaporator 14 flows, and exchanges heat between the refrigerant flowing through the first flow path 41 and the refrigerant flowing through the second flow path 42, and the heat exchanger 20 has a proximity / separation mechanism 50 that moves the first flow path 41 and the second flow path 42 closer to or farther from each other depending on the temperature of the refrigerant flowing through the first flow path 41.

[0042] According to this configuration, when the proximity / separation mechanism 50 brings the first flow path 41 and the second flow path 42 closer to each other, heat exchange between the refrigerant flowing through the first flow path 41 and the refrigerant flowing through the second flow path 42 is promoted, thereby improving the operating efficiency of the heating and cooling system 1. On the other hand, when the proximity / separation mechanism 50 separates the first flow path 41 and the second flow path 42, heat exchange between the refrigerant flowing through the first flow path 41 and the refrigerant flowing through the second flow path 42 is suppressed, preventing the temperature of the refrigerant introduced into the compressor 11 from becoming too high. Therefore, an excessive temperature rise in the compressor 11 can be prevented, making it possible to make the lubricating oil in the compressor 11 less susceptible to deterioration. In this way, the heating and cooling system 1 is able to improve the durability of the compressor 11.

[0043] (2) In the heating and cooling system 1 described in (1), it is preferable that the proximity and separation mechanism 50 includes a shape memory alloy 52 between the first housing 61 including the first flow path 41 and the second housing 62 including the second flow path 42, which expands depending on the temperature of the refrigerant flowing through the first flow path 41.

[0044] According to this configuration, when the temperature of the shape memory alloy 52 reaches a predetermined value in response to heat from the refrigerant flowing through the first flow path 41, the shape memory alloy 52 expands, thereby creating a gap between the first flow path 41 and the second flow path 42, thereby achieving thermal insulation. On the other hand, when the temperature of the shape memory alloy 52 falls below a predetermined value in response to heat from the refrigerant flowing through the first flow path 41, the shape memory alloy 52 contracts due to the weight of the first housing 61, thereby eliminating the gap between the first flow path 41 and the second flow path 42 and allowing heat transfer between the first flow path 41 and the second flow path 42. At this time, by adjusting the expansion / contraction strength of the shape memory alloy 52, it is possible to achieve thermal insulation under targeted conditions.

[0045] (3) In the heating and cooling system 1 described in (1), it is preferable that the proximity and separation mechanism 50 includes a bimetal 82 between the first housing 61 including the first flow path 41 and the second housing 62 including the second flow path 42, the amount of deformation of which changes depending on the temperature of the refrigerant flowing through the first flow path 41.

[0046] According to this configuration, when the temperature of the bimetal 82 reaches a predetermined value in response to heat from the refrigerant flowing through the first flow path 41, the amount of deformation of the bimetal 82 increases, creating a gap between the first flow path 41 and the second flow path 42, thereby achieving thermal insulation. On the other hand, when the temperature of the bimetal 82 falls below a predetermined value in response to heat from the refrigerant flowing through the first flow path 41, the amount of deformation of the bimetal 82 decreases, eliminating the gap between the first flow path 41 and the second flow path 42, allowing heat transfer between the first flow path 41 and the second flow path 42. At this time, by adjusting the dimensions of the bimetal 82, it is possible to achieve thermal insulation under targeted conditions.

[0047] (4) In the heating and cooling system 1 described in (3), it is preferable that the proximity and separation mechanism 50 includes a heat transfer block 51 provided between the first housing 61 and the second housing 62, and a guide portion 54 made of a material having a thermal conductivity lower than that of the heat transfer block 51, which guides the relative movement between the first housing 61 and the second housing 62.

[0048] According to this configuration, heat exchange can be performed between the first flow path 41 and the second flow path 42 via the heat transfer block 51. Also, by adjusting the size and thermal mass of the heat transfer block 51, it is possible to bring the first flow path 41 and the second flow path 42 closer to or farther apart under desired conditions. Furthermore, the guide portion 54 makes it easy to bring the first housing 61 and the second housing 62 closer to or farther apart, and it is also possible to suppress unintended heat transfer via the guide portion 54. [Industrial Applicability]

[0049] The technology disclosed herein can be used in a heating and cooling system that performs heating and cooling. [Explanation of symbols]

[0050] 1: Heating and cooling system, 11: Compressor, 12: Water-cooled condenser, 13: Expansion valve, 14: Evaporator, 20: Heat exchanger, 41: First flow path, 42: Second flow path, 50: Close-up and space mechanism, 51: Heat transfer block, 52: Shape memory alloy, 54: Guide portion, 61: First housing, 62: Second housing, 82: Bimetal

Claims

1. a compressor that compresses the fluid; a condenser that condenses the fluid compressed by the compressor; an expansion valve that expands the fluid condensed by the condenser; an evaporator that evaporates the fluid expanded in the expansion valve and sends the evaporated fluid to the compressor; a heat exchanger having a first flow path through which the fluid discharged from the condenser flows and a second flow path through which the fluid discharged from the evaporator flows, and performing heat exchange between the fluid flowing through the first flow path and the fluid flowing through the second flow path, The heat exchanger has a mechanism for moving the first flow path and the second flow path closer to or farther from each other depending on the temperature of the fluid flowing through the first flow path.

2. 2. The heating and cooling system of claim 1, wherein the approaching and separating mechanism includes a shape memory alloy between a first housing including the first flow path and a second housing including the second flow path, the shape memory alloy expanding in accordance with the temperature of the fluid flowing through the first flow path.

3. 2. The heating and cooling system of claim 1, wherein the approaching and separating mechanism includes a bimetal between a first housing including the first flow path and a second housing including the second flow path, the bimetal having a deformation amount that changes depending on the temperature of the fluid flowing through the first flow path.

4. 4. The heating and cooling system of claim 2, wherein the approaching and separating mechanism includes a heat transfer block provided between the first housing and the second housing, and a guide portion made of a material having a thermal conductivity lower than that of the heat transfer block, which guides the relative movement between the first housing and the second housing.

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