Rotary heat pump, air conditioner equipped with the rotary heat pump, and vehicle

Abstract

An object of the present invention is to provide a rotary heat pump that does not allow lubricating oil to stay in a bypass path that connects expansion regions to each other. As a solution, a rotary heat pump (100) is provided, which includes: a rotary drive unit (60) having a rotor (20), a rotor housing (30), a first side housing (40), and a second side housing (50), the rotor (20) eccentrically rotating as the rotary shaft (10) rotates, and the first side housing (40) and the second side housing (50) covering the rotor housing (30); heat exchange fins (70) disposed on the outer surface of the rotor housing (30) in each of the compression region (32) with the smallest planar area and the expansion region (34) with the largest planar area defined by the rotor (20) and the rotor housing (30); and a bypass path (90) that connects a first expansion region (34A) and a second expansion region (34B), and an interval from the uppermost position (94) to each expansion region (34A, 34B) in the bypass path (90) is formed by a descending slope portion (96).

Description

Technical Field

[0001] The present invention relates to a rotary heat pump, an air conditioner, and an automobile equipped with the rotary heat pump. Background Art

[0002] Conventionally, a structure of a heat pump (refrigerator) in the form of a Stirling engine has been known. For such a heat pump, a so-called reciprocating heat pump and a rotary heat pump have been proposed. In terms of easily achieving noise reduction and miniaturization, the rotary heat pump is more preferable than the reciprocating heat pump. For recent rotary heat pumps, a heat pump having a structure as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-38879) has been proposed.

[0003] As Figure 5 shown, the rotary heat pump RHP disclosed in Patent Document 1 employs a structure having two rotary rotors, i.e., a displacer-side rotary rotor DR and a power-side rotary rotor PR. Therefore, in order to meet the requirements for further miniaturization and weight reduction, the applicant proposed a solution for the structure of a small and high-performance rotary heat pump in PCT / JP2021 / 000690. In PCT / JP2021 / 000690, by using a bypass path to connect the expansion regions in the rotary heat pump to each other, the space volume for the refrigerant gas to expand is increased, thereby improving the heat exchange efficiency through the expansion and compression of the refrigerant gas.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2008-38879 (Claims 2, Figure 1 , Figure 2 etc.) Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] In the rotary drive unit, a lubricating fluid is injected for lubricating each structure. Therefore, in the rotary drive unit, the lubricating fluid moves sequentially as the refrigerant gas moves. In the compression region, a part of the lubricating fluid vaporizes and is sent out from the compression region to the expansion region and the bypass path together with the refrigerant gas. At this time, the refrigerant gas and the vaporized lubricating fluid are cooled, the refrigerant gas remains in a gaseous state, and the lubricating fluid sometimes condenses and stays in the bypass path. Since the lubricating fluid stays in the bypass path in this way, the problem of insufficient lubricating fluid in the rotary drive unit and insufficient lubrication in the rotary drive unit becomes obvious.

[0009] Solutions to the Problems

[0010] Accordingly, an object of the present invention is to provide a rotary heat pump, an air conditioner, and an automobile having the rotary heat pump, in which even if there is a bypass path that connects the expansion regions in the rotary drive unit, lubricating fluid does not stay in the bypass path, and the rotary drive unit can be reliably lubricated with the lubricating fluid.

[0011] That is, the present invention provides a rotary heat pump, characterized in that the rotary heat pump includes: a rotary drive unit having a rotary shaft, a fixed gear, a rotor, a rotor housing, a first side housing, and a second side housing, the rotary shaft passing through the fixed gear, the rotor eccentrically rotating as the rotary shaft rotates, the rotor having a rotor gear meshing with the fixed gear, the rotor gear being formed to have a diameter larger than the outer diameter of the fixed gear, the rotor housing being formed to be able to divide the radially outer region of the rotor along an epicycloid curve defined by the eccentric rotation of the rotor, the first side housing having a through hole through which the rotary shaft passes and covering one end side of the rotor housing, and the fixed gear being fixed to the first side housing, the second side housing covering the other end side of the rotor housing; heat exchange fins disposed on the outer surface of the rotor housing in a compression region having the smallest planar area and an expansion region having the largest planar area in a region defined by the outer peripheral surface of the rotor and the inner peripheral surface of the rotor housing; and a bypass path that connects the two expansion regions, an interval in the bypass path from the uppermost position in the vertical direction in the bypass path to at least one of a first communication portion that communicates with the first expansion region and a second communication portion that communicates with the second expansion region being formed by a downward slope portion.

[0012] In addition, it is also possible to provide a rotary heat pump, characterized in that the rotary heat pump includes: a rotary drive unit having a rotary shaft, a fixed gear, a rotor, a rotor housing, a first side housing, and a second side housing, the rotary shaft passing through the fixed gear, the rotor eccentrically rotating as the rotary shaft rotates, the rotor having a rotor gear meshing with the fixed gear, the rotor gear being formed with a diameter larger than the outer diameter of the fixed gear, the rotor housing being formed to be able to divide the radially outer region of the rotor along an epicycloid curve defined by the eccentric rotation of the rotor, the first side housing having a through hole through which the rotary shaft passes and covering one end side of the rotor housing, and the fixed gear being fixed to the first side housing, the second side housing covering the other end side of the rotor housing; heat exchange fins disposed on the outer surface of the rotor housing in the compression region with the smallest planar area and the expansion region with the largest planar area in the region defined by the outer peripheral surface of the rotor and the inner peripheral surface of the rotor housing; and a bypass path connecting the two expansion regions, an interval in the bypass path from the uppermost position in the vertical direction in the bypass path to at least one of a first communication portion communicating with the first expansion region and a second communication portion communicating with the second expansion region being formed by a horizontal portion and a descending slope portion.

[0013] Thus, it is possible to provide a rotary heat pump as follows. In this rotary heat pump, even if there is a bypass path connecting the expansion regions in the rotary drive unit, lubricating fluid will not stay in the bypass path, and the rotary drive unit can be reliably lubricated with the lubricating fluid.

[0014] In addition, preferably, the bypass path is respectively connected to bypass holes formed in at least one of the first side housing and the second side housing in the expansion region.

[0015] Thus, an increase in the external dimension caused by the bypass path can be suppressed.

[0016] In addition, preferably, the rotor is a Wankel-type rotor, and the rotor housing is a Wankel-type rotor housing.

[0017] Thus, since a known rotary structure can be adopted, the reliability of the rotary structure can be improved.

[0018] In addition, there is also a technical solution for an air conditioner, characterized in that the rotary heat pump described in any one of the above is mounted, and there is also a technical solution for an automobile equipped with this air conditioner.

[0019] Accordingly, it is possible to provide an air conditioner and an automobile having a rotary heat pump as described below. In this rotary heat pump, even if there is a bypass path that connects the expansion regions in the rotary drive unit, lubricating fluid does not stay in the bypass path, and the rotary drive unit can be reliably lubricated with the lubricating fluid.

[0020] Effects of the Invention

[0021] According to the structure of the rotary heat pump in the present invention, it is possible to provide a rotary heat pump, an air conditioner, and an automobile having the rotary heat pump. In the rotary heat pump, even if there is a bypass path that connects the expansion regions in the rotary drive unit, lubricating fluid does not stay in the bypass path, and the rotary drive unit can be reliably lubricated with the lubricating fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view showing the internal structure by peering through the second side housing of the rotary heat pump in the first embodiment.

[0023] Figure 2 in Figure 2 A is a perspective view of the rotary heat pump 100 in the second embodiment, Figure 2 B is a perspective view of the internal structure observed from the arrow B side in Figure 2 A.

[0024] Figure 3 It is a schematic diagram showing an air conditioner equipped with the rotary heat pump in the present embodiment.

[0025] Figure 4 is installed with Figure 3 The explanatory drawing of the motor vehicle of the air conditioner shown.

[0026] Figure 5 It is a schematic structural diagram of a rotary heat pump in the prior art. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, the rotary heat pump 100 in the present invention will be described with reference to the accompanying Figure 1 drawings.

[0028] (First Embodiment)

[0029] Figure 1 It is a front view showing the internal structure by peering through the second side housing 50 of the rotary heat pump 100 in the first embodiment. The upper side in the drawing of the rotary heat pump 100 in the present embodiment is the upper side in the vertical direction. Figure 1The rotary heat pump 100 shown includes a rotary drive unit 60, heat exchange fins 70 disposed on the outer wall surface of the rotary drive unit 60, and a bypass path 90 that connects two expansion regions 34 within the rotary drive unit 60. The rotary drive unit 60 of the present embodiment has a rotary shaft 10, a fixed gear 15, a rotor 20, a rotor housing 30, a first side housing 40, and a second side housing 50. The rotary drive unit 60 has a basic part formed of a metal material and a heat insulating part 80 formed of a heat insulating material. As can be seen from Figure 1 As described above, in the present embodiment, the form of a Wankel-type vertical rotary drive unit 60 is used for the rotary heat pump 100 for explanation.

[0030] Regarding the rotary shaft 10, the first end is supported to be rotatable within the internal space of the rotary drive unit 60, and the second end protrudes outside the rotary drive unit 60 from a through hole (not shown) of the first side housing 40. The second end of the rotary shaft 10 is connected to the output shaft of a prime mover (both not shown) provided outside the rotary drive unit 60 by a known method. In addition, the fixed gear 15 inserted from the outer surface side of the first side housing 40 and through which the rotary shaft 10 passes is fixed to the through hole of the first side housing 40 by screw fastening. Such a rotary shaft 10 is preferably used as an eccentric shaft in the same manner as a rotary engine.

[0031] Regarding the rotor 20 in the present embodiment, at least the required thickness range of the outer surface is formed into an outer shape of a so-called Reuleaux triangle (Wankel-type rotor) by a heat insulating material, and is fitted into the journal 12 formed on the rotary shaft 10 at the portion of the fitting hole 22 and fixed in a state capable of co-rotating with the rotary shaft 10. A rotor gear 24 is formed in the central portion observed when looking down on the rotor 20. The diameter size of the rotor gear 24 is larger than the outer diameter sizes of the fixed gear 15 and the fitting hole 22, and is formed on the same axis as the fitting hole 22 and meshes with the fixed gear 15. The fixed gear 15 fixed to the first side housing 40 and the rotor gear 24 are both meshed only within a required range in the circumferential direction. Therefore, when the rotary shaft 10 rotates, the rotor 20 performs an eccentric rotational motion around the rotary shaft 10 (fixed gear 15).

[0032] The rotor housing 30 is formed into a cocoon-shaped cylindrical body (Wankel-type rotor housing), which can divide the radially outer region of the rotor 20 on a plane along an epicycloid curve defined by the eccentric rotation of the rotor 20. One opening surface of the rotor housing 30 is covered by the first side housing 40, and the first side housing 40 is formed with a through hole (not shown) for inserting the fixed gear 15 into the inside of the rotor housing 30 (rotary drive unit 60). The rotary shaft 10 passes through the fixed gear 15, and the rotary shaft 10, the fixed gear 15, and the first side housing 40 are in a state of being sealed by a known method.

[0033] In addition, on another opening surface of the rotor housing 30, a second side housing 50 is mounted in a state of being sealed with the rotor housing 30. The basic form of such a rotary drive unit 60 can be set to be the same as the structure of a so-called rotary engine in which the intake / exhaust section and the ignition section are omitted. Further, in the present embodiment, it is preferable that the space surrounded by the rotor 20, the rotor housing 30, the first side housing 40, and the second side housing 50 is sealed by appropriately arranged sealing members (not shown). As an example of the refrigerant gas, helium gas is filled in this space respectively.

[0034] In addition, on the outer surface of the rotor housing 30, heat exchange fins 70 are respectively arranged at a plurality of positions in the circumferential direction across a required range. On the rotor housing 30, the shape and the planar area of the region defined by the inner circumferential surface of the rotor housing 30 and the outer circumferential surface of the rotor 20 change as the rotor 20 eccentrically rotates. In the present embodiment, when the rotary shaft 10 is taken as the rotation center, two compression regions 32 with the smallest planar area in the defined region and two expansion regions 34 with the largest planar area in the defined region are respectively formed. More specifically, the compression regions 32 and the expansion regions 34 are alternately arranged at 90-degree intervals with the planar central portion of the rotor housing 30 as the rotation center in the circumferential direction of the rotor housing 30.

[0035] On the outer wall surface of the rotary drive unit 60 at a position corresponding to the high-temperature region, i.e., the compression region 32, heat dissipation fins 72 are erected, and on the outer wall surface of the rotary drive unit 60 at a position corresponding to the low-temperature region, i.e., the expansion region 34, heat absorption fins 74 are erected. Thus, the heat exchange fins 70 in the present embodiment are composed of the heat dissipation fins 72 and the heat absorption fins 74, but the heat dissipation fins 72 and the heat absorption fins 74 are not erected in all of the compression regions 32 and all of the expansion regions 34.

[0036] The expansion region 34 in the present embodiment is composed of a first expansion region 34A located on the upstream side in the rotation direction of the rotor 20 and a second expansion region 34B located on the downstream side in the rotation direction of the rotor 20. The first expansion region 34A and the second expansion region 34B are communicated through a bypass path 90. As Figure 1 shown, a bypass path radiator 92 can also be arranged in the bypass path 90. In the present embodiment, heat absorption fins 74 are only erected on the outer circumferential surface of the first expansion region 34A at a position in the first expansion region 34A and the second expansion region 34B that is immediately behind the compression region 32.

[0037] In addition, in the compression region 32A at the position clamped by the first expansion region 34A and the second expansion region 34B, compression of helium as a refrigerant gas is substantially not performed. Therefore, the compression region 32A at the position clamped by the first expansion region 34A and the second expansion region 34B is excluded from the objects where the heat dissipation fins 72 and the heat insulation part 80 are disposed. That is, at least the heat dissipation fins 72 among the heat dissipation fins 72 and the heat insulation part 80 are disposed only in the compression region 32 at the position behind the expansion region 34 (here, the second expansion region 34B) located at the most downstream position among the plurality of expansion regions 34 (here, the first expansion region 34A and the second expansion region 34B) connected by the bypass path 90. With such a structure, it is possible to contribute to the weight reduction of the rotary heat pump 100 and the reduction of the manufacturing cost.

[0038] In the present embodiment, the bypass path 90 is connected to a bypass hole 34C formed in the rotor housing 30 of the first expansion region 34A and the second expansion region 34B whose height position in the vertical direction is above the first expansion region 34A. By connecting the first expansion region 34A and the second expansion region 34B in this way, the space volume for expanding the helium sent out from the compression region 32 can be greatly increased, and the temperature reduction caused by the expansion of helium can be promoted. More specifically, the longitudinal cutting slopes from the uppermost position 94 in the vertical direction of the bypass path 90 to the first expansion region 34A and the second expansion region 34B in the bypass path 90 are both downward slopes. In other words, the connection is made through a downward slope portion 96, and the height position in the vertical direction in the bypass path 90 gradually becomes lower as it goes from the uppermost position 94 in the vertical direction in the bypass path 90 toward the bypass hole 34C as the first connection portion connected to the first expansion region 34A and the bypass hole 34C as the second connection portion connected to the second expansion region 34B.

[0039] When the rotary drive unit 60 is rotated by a prime mover (not shown), helium gas, which is a refrigerant gas filled in the internal space of the rotary drive unit 60, is sequentially sent to the compression region 32 and the first expansion region 34A and the second expansion region 34B that alternately appear in the circumferential direction of the rotor housing 30, thereby alternately switching between a high-temperature state and a low-temperature state. Lubricating fluid represented by vaporized lubricating oil is mixed in the helium gas sent out from the compression region 32. If it is sent to the first expansion region 34A, the second expansion region 34B, and the bypass path 90 connecting them, the lubricating fluid will condense due to the temperature drop. In the present embodiment, even if the lubricating fluid condenses in the bypass path 90, under the action of gravity, the lubricating fluid can flow down from the uppermost position 94 in the bypass path 90 to the first expansion region 34A and the second expansion region 34B respectively through the descending slope portion 96. Therefore, the lubricating fluid does not stay in the bypass path 90, and the reliable lubricating effect of the lubricating fluid on the rotary drive unit 60 can be maintained.

[0040] By adopting the form of the rotary heat pump 100 in the present embodiment, a heat pump structure of a full-gas-phase Carnot cycle capable of reliably lubricating the rotary drive unit 60 can be achieved. During one rotation of the rotor 20 in the internal space of the rotor housing 30 in the present embodiment, heat dissipation and heat absorption can be performed once respectively. Thus, although it has a small and lightweight structure and low noise, heat exchange can be efficiently performed. And if the rotation of the output shaft of the prime mover is increased to increase the rotational speed of the rotor 20, rapid heating and rapid cooling can be performed, which is also preferable in this regard. And the lubricating fluid injected into the rotary drive unit 60 does not stay in the bypass path 90, and the lubricating effect on the rotary drive unit 60 can always be performed. From this point of view, a rotary heat pump 100 with relatively high reliability can be provided.

[0041] (Second Embodiment)

[0042] Figure 2 A is a perspective view of the rotary heat pump 100 in the second embodiment, Figure 2 B is from Figure 2 A perspective view of the internal structure observed from the arrow B side in A. In addition, in Figure 2 , for the sake of simplifying the illustration, the display of the heat dissipation fins 72, the heat absorption fins 74, the heat insulation portion 80, etc. is omitted, but the heat dissipation fins 72, the heat absorption fins 74, the heat insulation portion 80, etc. can be arranged in the same manner as in the first embodiment. In addition, in the present embodiment, for the structures that are the same as those in the other embodiments described above, the same reference numerals as those used in the drawings of the previous embodiments are marked, and the detailed description here is omitted. The structure of the rotary heat pump 100 in the present embodiment is different from that of the rotary heat pump 100 in the first embodiment in that the rotary shaft 10 stands in the orthogonal direction (vertical direction) with respect to the installation surface.

[0043] In the present embodiment, the first expansion region 34A and the second expansion region 34B are at the same height position in the vertical direction and are connected by a bypass path 90 formed in an inverted Japanese syllable "コ" shape and communicating therewith. The uppermost position 94 in the vertical direction of the bypass path 90 in the present embodiment is formed in a horizontal portion across a required length range, and the bypass path 90 is connected to the first expansion region 34A and the second expansion region 34B at both end portions of the horizontal portion by descending slope portions 96. In this way, even if there is a horizontal portion in the bypass path 90 due to the layout of the bypass path 90, the lubricating fluid will flow down from the descending slope portions 96 having an extended length more than twice the extended length of the horizontal portion to the first expansion region 34A and the second expansion region 34B, so that the retention of the lubricating fluid at the horizontal portion of the bypass path 90 will not affect the lubrication of the rotary drive unit 60. In addition, by forming the bypass path 90 with a material having hydrophilicity with the lubricating fluid or performing a surface treatment on the inner peripheral surface of the bypass path 90 to improve the hydrophilicity with the lubricating fluid, the flow-down of the lubricating fluid in the bypass path 90 can also be promoted.

[0044] As described above, the rotary heat pump 100 of the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment. For example, the form of the rotary heat pump 100 in the above-described embodiment using a Wankel-type rotary drive unit 60 has been described, but it is not limited to this configuration, and a known configuration of the rotary drive unit 60 can also be appropriately used. When there are a plurality of expansion regions 34 in the configuration of the rotary drive unit 60, three or more expansion regions 34 can also be connected to each other by the bypass path 90. In this case, in the compression region 32A at the position sandwiched by the expansion regions 34 connected by the bypass path 90, substantial compression of the refrigerant gas is not performed, so that the arrangement of the heat dissipation fins 72 to these formal compression regions 32A can be omitted. In addition, for the connection portion of the plurality of expansion regions 34 connected by the bypass path 90 and the layout of the bypass path 90 that are connected by the bypass path 90, the same layout as the above-described embodiment can be adopted.

[0045] In addition, for the rotary heat pump 100 in the above embodiment, as Figure 1 and Figure 2As shown, bypass holes 34C are provided in the rotor housing 30 in the first expansion region 34A and the second expansion region 34B, and these bypass holes 34C are used as the first communication part and the second communication part, but it is not limited to this form. It is also possible that, instead of the bypass holes 34C provided in the rotor housing 30 as the first communication part and the second communication part, through holes (not shown) penetrating the first side housing 40 in the plate thickness direction are formed as the first communication part and the second communication part, and the through holes in the plurality of expansion regions 34 are connected to each other through a bypass path 90. The through holes are not only provided in the first side housing 40, but can also be provided in the second side housing 50, or in the first side housing 40 and the second side housing 50. By disposing the bypass path 90 in the planar region of the rotary drive unit 60 in this way, it is preferable in terms of being able to reduce the planar occupied area compared to the rotary heat pump 100 in the present embodiment.

[0046] In the first embodiment, a form is shown in which a bypass path radiator 92 is disposed in the bypass path 90 and heat exchange (heat absorption) can also be performed in the bypass path 90, but it is not limited to this form. It is possible to adopt a form in which the bypass path 90 is formed of a heat insulating material, or it is also possible to adopt a form in which the arrangement of the bypass path radiator 92 is omitted as Figure 2 shown.

[0047] In addition, in the above embodiments, layouts in which the rotary shaft 10 is rotated 90 degrees with respect to the vertical line (first embodiment) and a layout in which the rotary shaft 10 is parallel to the vertical line (second embodiment) are illustrated, but it is not limited to the above layouts. It is also possible to adopt a form in which the rotary heat pump 100 has an intermediate layout between the layouts shown in the first embodiment and the second embodiment. In short, as long as the lubricating fluid does not stay in the bypass path 90 that connects the first expansion region 34A and the second expansion region 34B, the bypass path 90 can be formed only by the descending slope portion 96 with respect to either the first expansion region 34A or the second expansion region 34B, or the bypass path 90 can be formed by the descending slope portion 96 and a small amount of horizontal portion.

[0048] In addition, for the bypass path 90 in the above embodiments, a form is shown in which both the bypass hole 34C as the first communication part connected to the first expansion region 34A and the bypass hole 34C as the second communication part connected to the second expansion region 34B are connected through the descending slope portion 96 starting from the uppermost position 94 in the vertical direction, but it is not limited to this form. It is also possible to adopt a form in which only either the bypass hole 34C of the first expansion region 34A or the bypass hole 34C of the second expansion region 34B from the uppermost position 94 of the bypass path 90 is connected by the descending slope portion 96.

[0049] In addition, in the second embodiment, a configuration is shown in which the horizontal portion in the bypass path 90 is disposed at the uppermost position 94 in the vertical direction in the bypass path 90, but the configuration is not limited to this. The horizontal portion may also be disposed in the middle of the descending slope portion 96.

[0050] In addition, in the present embodiment, a configuration in which helium gas having a high thermal conductivity is filled inside the counter-rotating drive unit 60 as a refrigerant gas has been described. However, the refrigerant gas having such characteristics is not limited to helium gas, and known refrigerant gases such as hydrogen gas and carbon dioxide gas can also be appropriately used.

[0051] In addition, as Figure 4 shown, there is also a technical solution for the air conditioner 200 equipped with the rotary heat pump 100 described above. In addition, as Figure 5 shown, there is also a technical solution for the vehicle 300 equipped with the air conditioner 200 equipped with the rotary heat pump 100 described in the present embodiment. In addition, since the specific structures of the air conditioner 200 and the vehicle 300 are well known, detailed descriptions thereof are omitted here. In addition, according to the air conditioner 200 of the present invention, miniaturization, weight reduction, and high efficiency can be achieved. In addition, according to the vehicle 300 of the present invention, in addition to miniaturization and weight reduction, the in-vehicle system is significantly energy-saving, and thus the electrification of the vehicle 300 can also be promoted.

[0052] Moreover, a configuration in which the rotary heat pumps 100 described above are arranged in series in the axial direction of the rotary shaft 10 can also be adopted. As a result, although the occupied volume of the rotary heat pump 100 increases, if an elongated space can be ensured, a higher-performance rotary heat pump 100, an air conditioner 200 equipped with the rotary heat pump 100, and a vehicle 300 equipped with the rotary heat pump 100 can be provided.

[0053] Furthermore, for the structure of the present embodiment described above, a configuration in which the modification examples and other known structures described in the specification are appropriately combined can also be adopted.

Claims

1. A rotary heat pump, characterized in that the rotary heat pump comprises: a rotary drive unit having a rotary shaft, a fixed gear, a rotor, a rotor housing, a first side housing, and a second side housing, wherein the rotary shaft penetrates through the fixed gear, the rotor rotates eccentrically as the rotary shaft rotates, the rotor has a rotor gear meshing with the fixed gear, the rotor gear is formed to have a diameter larger than the outer diameter of the fixed gear, the rotor housing is formed to be able to divide the radially outer region of the rotor along an epicycloid curve defined by the eccentric rotation of the rotor, the first side housing has a through hole through which the rotary shaft penetrates and covers one end side of the rotor housing, and the fixed gear is fixed to the first side housing, and the second side housing covers the other end side of the rotor housing; heat exchange fins disposed on the outer surface of the rotor housing in the compression region with the smallest planar area and the expansion region with the largest planar area in the region defined by the outer peripheral surface of the rotor and the inner peripheral surface of the rotor housing; and a bypass path that connects the two expansion regions, wherein an interval in the bypass path from the uppermost position in the vertical direction in the bypass path to at least one of a first communication portion communicating with the first expansion region and a second communication portion communicating with the second expansion region is formed by a descending slope portion.

2. A rotary heat pump, characterized in that the rotary heat pump comprises: a rotary drive unit having a rotary shaft, a fixed gear, a rotor, a rotor housing, a first side housing, and a second side housing, wherein the rotary shaft penetrates through the fixed gear, the rotor rotates eccentrically as the rotary shaft rotates, the rotor has a rotor gear meshing with the fixed gear, the rotor gear is formed to have a diameter larger than the outer diameter of the fixed gear, the rotor housing is formed to be able to divide the radially outer region of the rotor along an epicycloid curve defined by the eccentric rotation of the rotor, the first side housing has a through hole through which the rotary shaft penetrates and covers one end side of the rotor housing, and the fixed gear is fixed to the first side housing, and the second side housing covers the other end side of the rotor housing; heat exchange fins disposed on the outer surface of the rotor housing in the compression region with the smallest planar area and the expansion region with the largest planar area in the region defined by the outer peripheral surface of the rotor and the inner peripheral surface of the rotor housing; and a bypass path that connects the two expansion regions, wherein an interval in the bypass path from the uppermost position in the vertical direction in the bypass path to at least one of a first communication portion communicating with the first expansion region and a second communication portion communicating with the second expansion region is formed by a horizontal portion and a descending slope portion.

3. The rotary heat pump according to claim 1 or 2, characterized in that the bypass paths are respectively connected to bypass holes formed in at least one of the first side housing and the second side housing in each of the expansion regions.

4. The rotary heat pump according to any one of claims 1 to 3, characterized in that the rotor is a Wankel-type rotor, and the rotor housing is a Wankel-type rotor housing.

5. An air conditioner, characterized in that the air conditioner is equipped with the rotary heat pump according to any one of claims 1 to 4.

6. A vehicle, characterized in that the vehicle is installed with the air conditioner according to claim 5.

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