Heat exchanger for refrigeration cycle mechanism

Abstract

To provide a heat exchanger for a refrigeration cycle mechanism improving heat exchange efficiency of a refrigerant between a suction pipe and a capillary tube.SOLUTION: A heat exchanger for a refrigerant cycle mechanism includes a capillary tube, and a suction pipe provided so as to be heat-exchanged with the capillary tube. A refrigerant can be moved in each of the capillary tube and the suction pipe. Both of the suction pipe and the capillary tube each have a shape curved in an extending direction, and the curved capillary tube is included in the curved suction pipe.SELECTED DRAWING: Figure 2A

Description

[Technical Field]

[0001] The present disclosure relates to a heat exchanger for a refrigeration cycle mechanism. [Background technology]

[0002] Refrigeration cycle mechanisms have been used in refrigerators and freezers for some time now. These refrigeration cycle mechanisms include a compressor, a condenser, a capillary tube, an evaporator, and a suction pipe, which are interconnected in this order so that a refrigerant can circulate.

[0003] Specifically, the refrigerant is first compressed in the compressor and sent to the condenser as a high-temperature, high-pressure gas, where it dissipates heat and is liquefied. The liquefied refrigerant is then sent to the evaporator through a capillary tube. The liquefied refrigerant sent to the evaporator is vaporized in the evaporator, absorbing heat from the surrounding area and generating cool air. The vaporized refrigerant then returns to the compressor through a suction pipe and is compressed again, completing the above-mentioned refrigerant circulation cycle.

[0004] In order to improve the cooling performance of such a refrigeration cycle mechanism, it is effective to lower the temperature of the liquefied refrigerant flowing from the capillary tube into the evaporator. In this regard, since the liquefied refrigerant passing through the capillary tube is relatively high temperature, in order to improve the cooling performance, a configuration may be adopted in which the suction pipe, through which a relatively low-temperature refrigerant flows, is brought into contact with the capillary tube. As a configuration in which the suction pipe and the capillary tube are brought into contact with each other, a structure in which the outer surfaces of the suction pipe and the capillary tube are fixed to each other by brazing may be adopted.

[0005] By bringing the suction pipe into contact with the capillary tube, heat exchange can be achieved between the low-temperature refrigerant in the suction pipe and the high-temperature refrigerant in the capillary tube. That is, the capillary tube and the suction pipe can constitute a heat exchanger for a refrigeration cycle mechanism. This heat exchange can lower the temperature of the refrigerant flowing through the capillary tube. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5900967 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-221697 [Patent Document 3] Japanese Patent Publication No. 2020-186887 Summary of the Invention [Problem to be solved by the invention]

[0007] The inventors of the present invention have now discovered that there are some points that need to be improved in the heat exchangers for conventional refrigeration cycle mechanisms.

[0008] Specifically, as described above, the contact between the suction pipe and the capillary tube can be achieved by brazing the outer surfaces of the suction pipe and the capillary tube.

[0009] However, in this structure, only a portion of the outer surface of the capillary tube contacts the outer surface of the suction pipe, which may result in insufficient heat exchange between the refrigerant in the suction pipe and the refrigerant in the capillary tube, resulting in low heat exchange efficiency between the suction pipe and the capillary tube.

[0010] Therefore, an object of the present disclosure is to provide a heat exchanger for a refrigeration cycle mechanism that can improve the heat exchange efficiency of the refrigerant between the suction pipe and the capillary tube. [Means for solving the problem]

[0011] In order to achieve the above object, in one embodiment of the present disclosure, a capillary tube and a suction pipe provided so as to be able to exchange heat with the capillary tube; A refrigerant is movable inside the capillary tube and the suction pipe, A heat exchanger for a refrigeration cycle mechanism is provided in which the suction pipe and the capillary tube both have a curved shape in the extension direction, and the curved capillary tube is contained within the curved suction pipe. [Effects of the Invention]

[0012] According to the heat exchanger for a refrigeration cycle mechanism according to one embodiment of the present disclosure, it is possible to improve the heat exchange efficiency of the refrigerant between the suction pipe and the capillary tube. [Brief explanation of the drawings]

[0013] [Figure 1] Schematic diagram of the refrigeration cycle mechanism [Figure 2A] FIG. 1 is a perspective view schematically illustrating a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure. [Figure 2B] FIG. 1 is a cross-sectional view schematically illustrating a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure, taken in the circumferential direction of a suction pipe. [Figure 3] FIG. 10 is a perspective view schematically illustrating a modified example of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure. [Figure 4] FIG. 10 is a perspective view schematically illustrating a modified example of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure. [Figure 5] FIG. 10 is a cross-sectional view schematically illustrating a modified example of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure, taken in the circumferential direction of a suction pipe. [Figure 6] FIG. 10 is a partial schematic perspective view showing a modified example of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure. [Figure 7] FIG. 10 is a partial schematic perspective view showing a modified example of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure. [Figure 8]1 is a partial schematic cross-sectional view showing a modified example of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure, taken in the extending direction (or axial direction) of a suction pipe. [Figure 9A] 1 is a schematic cross-sectional view showing a modified example of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure, taken in the extending direction (or axial direction) of a suction pipe. [Figure 9B] 1 is a schematic cross-sectional view showing a modified example of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure, taken in the extending direction (or axial direction) of a suction pipe. [Figure 10] 1 is a partial schematic cross-sectional view showing possible cross-sectional shapes of a capillary tube that is a component of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure. [Figure 11A] FIG. 1 is a cross-sectional view schematically illustrating the outer surface shape of a capillary tube, which is a component of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure, in the circumferential direction of a suction pipe. [Figure 11B] FIG. 1 is a cross-sectional view schematically illustrating the outer surface shape of a capillary tube, which is a component of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure, in the circumferential direction of a suction pipe. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure will be described in detail with reference to the drawings. The shapes and dimensions of various elements in the drawings are merely illustrative and do not reflect the actual shapes and dimensions.

[0015] Fig. 1 shows a schematic diagram of the configuration of a refrigeration cycle mechanism. Fig. 2A is a perspective view schematically showing a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure. Fig. 2B is a cross-sectional view schematically showing a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure in the circumferential direction of a suction pipe.

[0016] First, the configuration of a refrigeration cycle mechanism including a heat exchanger for a refrigeration cycle mechanism of the present disclosure will be described. As shown in Fig. 1, a refrigeration cycle mechanism 100 includes a compressor 10, a condenser 20 (corresponding to an outer condenser), a condenser 30 (corresponding to an inner condenser), a capillary tube 42, an evaporator 50, and a suction pipe 41, which are interconnected in this order to allow refrigerant to circulate. That is, the refrigerant can move through each of the above components. As will be described later, the suction pipe 41 and the capillary tube 42 can form a heat exchanger 40.

[0017] In this configuration, the refrigerant is first compressed in compressor 10 to become a high-temperature, high-pressure gas, which is then sent to condensers 20 and 30 in that order, where it dissipates heat and is liquefied. The liquefied refrigerant is sent to evaporator 50 through capillary tube 42. The liquefied refrigerant sent to evaporator 50 is vaporized in evaporator 50, thereby absorbing heat from the surrounding area and generating cool air. The vaporized refrigerant returns to compressor 10 through suction pipe 41 and is compressed again, thereby completing the above-described refrigerant circulation cycle.

[0018] Furthermore, from the viewpoint of lowering the temperature of the liquefied refrigerant flowing from the capillary tube 42 into the evaporator 50 and improving the cooling performance of the refrigeration cycle mechanism 100, the suction pipe 41 and the capillary tube 42 may be arranged in a positional relationship that allows heat exchange between the low-temperature refrigerant flowing in the suction pipe 41 and the high-temperature refrigerant flowing in the capillary tube 42. That is, as described above, the suction pipe 41 and the capillary tube 42 may form the heat exchanger 40.

[0019] Here, the present disclosure is characterized by the positional relationship between the suction pipe 41 and the capillary tube 42.

[0020] Specifically, on the premise that the refrigerant can move inside the capillary tube 42 and the suction pipe 41, both the suction pipe 41 and the capillary tube 42 are curved in the extension direction (longitudinal extension direction). Furthermore, the curved capillary tube 42 is contained within the curved suction pipe 41 in the extension direction of the suction pipe 41.

[0021] In this case, in the extending direction of the suction pipe 41, the outer surface of the curved capillary tube 42 can extend along the inner surface of the curved suction pipe 41. In addition, in the circumferential direction of the suction pipe 41, the entire outer surface of the capillary tube 42 is surrounded by the inner surface of the suction pipe 41.

[0022] According to this configuration, the outer surface of the capillary tube 42 located inside the suction pipe 41 can be entirely surrounded by the inner surface of the suction pipe 41. This makes it possible to effectively transfer the cooling heat of the relatively low-temperature refrigerant flowing inside the suction pipe 41 to the relatively high-temperature refrigerant flowing inside the capillary tube 42. In other words, the efficiency of heat exchange of the refrigerant between the suction pipe 41 and the capillary tube 42 can be improved.

[0023] As a result, it is possible to further lower the temperature of the liquefied refrigerant flowing from the capillary tube 42 into the evaporator 50. Therefore, it is possible to improve the cooling performance of the refrigeration cycle mechanism 100 as a whole.

[0024] It is preferable that the entire inner surface of the suction pipe 41 surrounds the outer surface of the capillary tube 42 in the extending direction of the suction pipe 41. That is, the curved capillary tube 42 is enclosed within the suction pipe 41 over its entire length in the extending direction of the suction pipe 41.

[0025] With this configuration, the entire outer surface of the capillary tube 42 is surrounded by the inner surface of the suction pipe 41 in the circumferential direction of the suction pipe 41, and the outer surface of the capillary tube 42 is surrounded by the entire inner surface of the suction pipe 41 in the extension direction of the suction pipe 41.

[0026] This allows the cooling heat of the low-temperature refrigerant in the suction pipe 41 to be appropriately transferred overall to the high-temperature refrigerant in the capillary tube 42. As a result, the heat exchange efficiency of the refrigerant between the suction pipe 41 and the capillary tube 42 can be further improved.

[0027] The heat exchanger 40 for a refrigeration cycle mechanism of the present disclosure (a structure having a curved suction pipe 41 and a curved capillary tube 42) can be formed by so-called additive manufacturing. One example of such additive manufacturing is the powder bed fusion process.

[0028] Powder bed fusion (PFB) is a method for manufacturing three-dimensional objects by irradiating a powder material with a light beam. This method produces three-dimensional objects by alternately forming powder layers and solidified layers based on the following steps (i) and (ii). This manufacturing technique makes it possible to manufacture complex three-dimensional objects in a short time.

[0029] (i) A step of irradiating a predetermined portion of the powder layer with a light beam to sinter or melt and solidify the powder at the predetermined portion to form a solidified layer. (ii) forming a new powder layer on the obtained solidified layer and similarly irradiating it with a light beam to form a further solidified layer;

[0030] Specifically, when manufacturing the heat exchanger 40 for a refrigeration cycle mechanism (a structure having a curved suction pipe 41 and a curved capillary tube 42) according to the present disclosure as the three-dimensionally shaped object, a light beam is irradiated to predetermined locations of the powder layer corresponding to the curved thick portions of the suction pipe 41 and the capillary tube 42 to form a solidified layer or solidified portion. In this case, a metal powder can be used as the powder constituting the powder layer. The metal powder can be an Al alloy, a Cu alloy, or stainless steel.

[0031] On the other hand, predetermined portions of the powder layer that correspond to the curved internal spaces of the suction pipe 41 and the capillary tube 42 are not irradiated with the light beam, and are left in a powder state, and the powder is removed later. By appropriately performing this light beam irradiation and non-irradiation, it is possible to finally manufacture the heat exchanger 40 for a refrigeration cycle mechanism of the present disclosure (a structure having a curved suction pipe 41 and a curved capillary tube 42).

[0032] Hereinafter, a preferred embodiment of a heat exchanger for a refrigeration cycle mechanism according to an embodiment of the present disclosure will be described.

[0033] In a preferred embodiment, the curvature of the curved portion of the capillary tube 42 is R20 or less (see FIG. 3). With this configuration, the flow resistance within the capillary tube 42 increases, resulting in increased pressure loss and a higher cooling effect.

[0034] In a preferred embodiment, the outer surface of the curved suction pipe 41 has an inner curved portion and an outer curved portion in the extending direction of the suction pipe 41, and one side of the inner curved portion faces and contacts with the other side (see FIG. 4). With this configuration, the area exposed to the outside air is reduced, which reduces heat loss and enables effective energy utilization.

[0035] In a preferred embodiment, the curved capillary tube 42 contacts the inner surface of the curved suction pipe 41 (see FIG. 5). With this configuration, the position of the capillary tube 42 can be stabilized compared to when the capillary tube 42 is not in contact with the inner surface of the suction pipe 41.

[0036] Furthermore, compared to when the capillary tube 42 is not in contact with the inner surface of the suction pipe 41, it is possible to adopt a configuration in which the capillary tube 42 is not positioned in the central region of the suction pipe 41. In this regard, the flow velocity of a fluid such as a refrigerant flowing through the internal space of the suction pipe 41 can be greatest in the central region of the suction pipe 41. Therefore, by adopting a configuration in which the capillary tube 42 is not positioned in the central region of the suction pipe 41, it is possible to increase the flow velocity of the refrigerant (vaporized refrigerant) flowing through the suction pipe 41. As a result, it is possible to further improve the heat exchange efficiency of the refrigerant between the suction pipe 41 and the capillary tube 42.

[0037] In a preferred embodiment, the capillary tube 42 has a spiral shape (see FIG. 6). With this configuration, the spiral shape of the capillary tube 42 can increase the flow resistance of the refrigerant (corresponding to the liquefied refrigerant) inside the capillary tube 42. This increases the pressure loss of the refrigerant, allowing the refrigerant inside the capillary tube 42 to be cooled appropriately.

[0038] Furthermore, since the capillary tube 42 is spiral, it is possible to adopt a configuration in which the capillary tube 42 is not positioned in the central region of the suction pipe 41. As described above, the flow velocity of a fluid such as a refrigerant flowing through the internal space of the suction pipe 41 can be greatest in the central region of the suction pipe 41. Therefore, by adopting a configuration in which the capillary tube 42 is not positioned in the central region of the suction pipe 41, it is possible to increase the flow velocity of the refrigerant (vaporized refrigerant) flowing inside the suction pipe 41. As a result, it is possible to further improve the heat exchange efficiency of the refrigerant between the suction pipe 41 and the capillary tube 42.

[0039] In a preferred embodiment, the capillary tube 42 is serpentine along the inner circumferential surface of the suction pipe 41 (see FIG. 7). With this configuration, the serpentine shape of the capillary tube 42 can increase the flow resistance of the refrigerant (corresponding to the liquefied refrigerant) inside the capillary tube 42. This increases the pressure loss of the refrigerant, allowing the refrigerant inside the capillary tube 42 to be cooled appropriately.

[0040] Furthermore, since the capillary tube 42 is serpentine along the inner peripheral surface of the suction pipe 41, the installation range of the capillary tube 42 inside the suction pipe 41 can be made larger compared to when the capillary tube 42 is placed closer to the central region of the suction pipe 41. This allows a larger contact area between the refrigerant flowing inside the suction pipe 41 and the outer surface of the capillary tube 42, thereby further improving the heat exchange efficiency of the refrigerant between the suction pipe 41 and the capillary tube 42.

[0041] In a preferred embodiment, the wall thickness of the capillary tube 42 on the upstream side of the refrigerant flowing inside the suction pipe 41 is thinner than the wall thickness of the capillary tube 42 on the downstream side of the refrigerant flowing inside the suction pipe 41 (see FIG. 8). With this configuration, the cooling heat of the refrigerant flowing from the upstream side to the downstream side inside the suction pipe 41 can be quickly transferred to the refrigerant flowing inside the internal space 43 of the capillary tube 42. This further improves the efficiency of heat exchange between the suction pipe 41 and the capillary tube 42.

[0042] In a preferred embodiment, when viewed in cross section in the extension direction of the suction pipe 41, the curved capillary tube 42 contacts the lower region of the inner surface of the suction pipe 41 (see FIGS. 9A and 9B). In another preferred embodiment, when viewed in cross section in the circumferential direction of the suction pipe 41, the cross section of the capillary tube 42 is triangular (see FIG. 10).

[0043] As described above, the heat exchanger 40 for a refrigeration cycle mechanism of the present disclosure (a structure having a curved suction pipe 41 and a curved capillary tube 42) can be manufactured, for example, by a powder bed fusion process (also known as powder bed fusion bonding).

[0044] In this regard, when manufacturing a heat exchanger 40 for a refrigeration cycle mechanism having an undercut portion as a three-dimensional shaped object, it is necessary to attach supports (supporting portions) for forming the capillary tubes that may be located inside. Therefore, the supports remain in the internal space of the resulting suction pipe 41, and furthermore, because the suction pipe 41 has a curved shape, there is a risk that the supports cannot be removed to the outside. The remaining supports in the internal space of the suction pipe 41 can cause flow resistance of the refrigerant flowing through the suction pipe 41.

[0045] In consideration of the above, a structure can be adopted in which the curved capillary tube 42 contacts the lower region of the inner surface of the suction pipe 41 in the extending direction of the suction pipe 41 (see FIGS. 9A and 9B) and / or the cross section of the capillary tube 42 is triangular in the circumferential direction of the suction pipe 41. With this structure, the heat exchanger 40 for a refrigeration cycle mechanism can be manufactured without providing a support (supporting portion) for forming the capillary tube that may be positioned inside. This improves the manufacturing efficiency of the heat exchanger 40 for a refrigeration cycle mechanism of the present disclosure (a structure having a curved suction pipe 41 and a curved capillary tube 42).

[0046] In a preferred embodiment, the outer surface of the capillary tube 42 has an uneven shape when viewed in cross section in the circumferential direction of the suction pipe 41 (see FIGS. 11A and 11B).

[0047] As an example of the outer surface of the capillary tube 42 having an uneven shape, the outer surface of the capillary tube 42 may have fin portions 44 at predetermined intervals, as shown in Fig. 11A. As another example, the outer surface of the capillary tube 42 may have protruding portions 45 at predetermined intervals, as shown in Fig. 11B.

[0048] With this configuration, the surface area of ​​the outer surface of the capillary tube 42 can be increased compared to when the outer surface of the capillary tube 42 does not have an uneven shape. This increases the contact area of ​​the refrigerant flowing through the suction pipe 41 with the outer surface of the capillary tube 42. This further improves the heat exchange efficiency of the refrigerant between the suction pipe 41 and the capillary tube 42.

[0049] Further, the following configurations can be adopted as a configuration for improving the heat exchange efficiency of the refrigerant between the suction pipe 41 and the capillary tube 42.

[0050] In a preferred embodiment, the heat exchanger 40 for a refrigeration cycle mechanism of the present disclosure (a structure having a curved suction pipe 41 and a curved capillary tube 42) can be placed in a thermally insulated state.

[0051] For example, the outer surface of the suction pipe 41 may be covered with a heat insulating material containing urethane resin, glass filler, etc. Also, the outside of the suction pipe 41 may be subjected to a vacuum or reduced pressure state.

[0052] This configuration can effectively prevent the cooling heat of the relatively low-temperature refrigerant flowing inside the suction pipe 41 from escaping to the outside. This allows the cooling heat of the low-temperature refrigerant flowing inside the suction pipe 41 to be preferentially transferred to the capillary tube 42 side.

[0053] In a preferred embodiment, powder of metal or the like can be positioned in the space between the inner surface of the suction pipe 41 and the outer surface of the capillary tube 42 within the suction pipe 41 .

[0054] The thermal conductivity of the metal powder is approximately zero, which can prevent the cooling heat of the relatively low-temperature refrigerant (such as the vaporized refrigerant coming out of the evaporator 50) flowing inside the suction pipe 41 from escaping to the outside. This allows the cooling heat of the low-temperature refrigerant flowing inside the suction pipe 41 to be preferentially transferred to the capillary tube 42 side.

[0055] In a preferred embodiment, the inner and / or outer surface of the capillary tube 42 may have a surface roughness of Rz 20 μm to Rz 200 μm.

[0056] According to this configuration, the specific surface area of ​​the inner surface and / or outer surface of the capillary tube 42 can be increased. This increases the contact area of ​​the refrigerant flowing through the suction pipe 41 with the outer surface of the capillary tube 42. Furthermore, the contact area of ​​the inner surface of the capillary tube 42 with the refrigerant flowing through the capillary tube 42 can be increased. As a result, the heat exchange efficiency of the refrigerant between the suction pipe 41 and the capillary tube 42 can be further improved.

[0057] In a preferred embodiment, the inside of the capillary tube 42 through which the refrigerant flows may be porous. With this configuration, the flow resistance of the refrigerant (corresponding to a liquefied refrigerant) inside the capillary tube 42 can be made larger than when the inside of the capillary tube 42 is an open space. This increases the pressure loss of the refrigerant, allowing the refrigerant inside the capillary tube 42 to be cooled more effectively.

[0058] Although the present disclosure has been described above, it is merely an example of a typical example within the scope of application of the present disclosure. Therefore, it will be readily understood by those skilled in the art that the present disclosure is not limited thereto and that various modifications can be made. The present disclosure may include the following aspects. <1> a capillary tube and a suction pipe provided so as to be able to exchange heat with the capillary tube; A refrigerant is movable inside the capillary tube and the suction pipe, A heat exchanger for a refrigeration cycle mechanism, wherein the suction pipe and the capillary tube both have a curved shape in the extension direction, and the curved capillary tube is contained within the curved suction pipe. <2> In the extending direction of the suction pipe, the entire inner surface of the suction pipe surrounds the outer surface of the capillary tube. <1> The heat exchanger for a refrigeration cycle mechanism according to claim 1. <3> In the extending direction of the suction pipe, the outer surface of the curved capillary tube extends along the inner surface of the curved suction pipe. <1> or <2> The heat exchanger for a refrigeration cycle mechanism according to claim 1. <4> The entire outer surface of the capillary tube is surrounded by the inner surface of the suction pipe in the circumferential direction of the suction pipe. <1> ~ <3> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <5> The curvature of the curved portion of the capillary tube is R20 or less. <1> ~ <4> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <6> The outer surface of the suction pipe having a curved shape has an inner curved portion and an outer curved portion in the extending direction of the suction pipe, and one side and the other side constituting the inner curved portion face each other and contact each other. <1> ~ <5> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <7> The curved capillary tube contacts the inner surface of the suction pipe. <1> ~ <6> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <8> The capillary tube is spiral. <1> ~ <7> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <9> The capillary tube is serpentine along the inner circumferential surface of the suction pipe. <1> ~ <8> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <10> a wall thickness of the capillary tube on an upstream side of the refrigerant flowing through the suction pipe is thinner than a wall thickness of the capillary tube on a downstream side of the refrigerant flowing through the suction pipe; <1> ~ <9> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <11> When viewed in cross section in the extending direction of the suction pipe, the capillary tube having a curved shape contacts a lower region of the inner surface of the suction pipe. <1> ~ <10> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <12> When viewed in cross section in the circumferential direction of the suction pipe, the cross-sectional shape of the capillary tube is triangular. <1> ~ <11> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <13> When viewed in cross section in the circumferential direction of the suction pipe, the outer surface of the capillary tube is uneven. <1> ~ <12> The heat exchanger for a refrigeration cycle mechanism according to any one of the preceding claims. <14> <1> ~ <13> A refrigeration cycle mechanism including the heat exchanger according to any one of the preceding claims, A refrigeration cycle mechanism includes a compressor, a condenser, the capillary tube, an evaporator, and the suction pipe, which are interconnected in this order so that a refrigerant can circulate. [Explanation of symbols]

[0059] 100 Refrigeration cycle mechanism 10 Compressor 20 Condenser (equivalent to outer condenser) 30 Condenser (equivalent to inner condenser) 40 Heat exchanger 41 Suction pipe 42 Capillary Tube 43 Capillary tube internal space 44 Fin portion located on the outer surface of the capillary tube 45 Protruding part located on the outer surface of the capillary tube 50 Evaporator

Claims

1. a capillary tube and a suction pipe provided so as to be able to exchange heat with the capillary tube; A refrigerant is movable inside the capillary tube and the suction pipe, A heat exchanger for a refrigeration cycle mechanism, wherein the suction pipe and the capillary tube both have a curved shape in the extension direction, and the curved capillary tube is contained within the curved suction pipe.

2. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein the entire inner surface of the suction pipe surrounds the outer surface of the capillary tube in the extending direction of the suction pipe.

3. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein an outer surface of the curved capillary tube extends along an inner surface of the curved suction pipe in the extending direction of the suction pipe.

4. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein the entire outer surface of the capillary tube is surrounded by the inner surface of the suction pipe in the circumferential direction of the suction pipe.

5. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein the curvature of the curved portion of the capillary tube is R20 or less.

6. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein the outer surface of the suction pipe having a curved shape has an inner curved portion and an outer curved portion in the extending direction of the suction pipe, and one side and the other side constituting the inner curved portion face each other and are in contact with each other.

7. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein the curved capillary tube is in contact with an inner surface of the suction pipe.

8. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein the capillary tube is spiral.

9. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein the capillary tube is serpentine along the inner circumferential surface of the suction pipe.

10. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein a wall thickness of the capillary tube on an upstream side of the refrigerant flowing through the suction pipe is thinner than a wall thickness of the capillary tube on a downstream side of the refrigerant flowing through the suction pipe.

11. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein the capillary tube having a curved shape is in contact with a lower region of an inner surface of the suction pipe in a cross-sectional view taken along an extension direction of the suction pipe.

12. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein the capillary tube has a triangular cross section in a cross section taken along the circumferential direction of the suction pipe.

13. 2. The heat exchanger for a refrigeration cycle mechanism according to claim 1, wherein an outer surface of the capillary tube is uneven when viewed in cross section in the circumferential direction of the suction pipe.

14. A refrigeration cycle mechanism including the heat exchanger according to claim 1, A refrigeration cycle mechanism includes a compressor, a condenser, the capillary tube, an evaporator, and the suction pipe, which are interconnected in this order so that a refrigerant can circulate.

Images