CN116420014A

CN116420014A - Rotary heat pump, and air conditioner and automobile equipped with same

Info

Publication number: CN116420014A
Application number: CN202180071132.1A
Authority: CN
Inventors: 汤泽史夫
Original assignee: Maruko Keihouki Co ltd
Current assignee: Maruko Keihouki Co ltd
Priority date: 2021-01-12
Filing date: 2021-12-06
Publication date: 2023-07-11
Also published as: JPWO2022153714A1; KR20230049719A; TW202233957A; JP7100404B1

Abstract

The invention provides a rotary heat pump which does not retain lubricating oil in bypass paths connecting expansion areas. In order to solve the problem, a rotary heat pump (100) is provided with: a rotation driving unit (60) that has a rotor (20), a rotor case (30), a 1 st-side case (40), and a 2 nd-side case (50), wherein the rotor (20) eccentrically rotates with the rotation of the rotation shaft (10), and the 1 st-side case (40) and the 2 nd-side case (50) cover the rotor case (30); a heat exchange fin (70) which is disposed on the outer surface of the rotor case (30) in each of the compression region (32) having the smallest planar area and the expansion region (34) having the largest planar area, said compression region being defined by the rotor (20) and the rotor case (30); and a bypass path (90) that communicates the 1 st expansion region (34A) and the 2 nd expansion region (34B), wherein a section of the bypass path (90) from the uppermost position (94) to each expansion region (34A, 34B) is formed by a descending slope (96).

Description

Rotary heat pump, and air conditioner and automobile equipped with same

Technical Field

The present invention relates to a rotary heat pump, and an air conditioner and an automobile each equipped with the rotary heat pump.

Background

Conventionally, a heat pump (refrigerator) using a stirling engine is known. A so-called reciprocating heat pump or a rotary heat pump is proposed as such a heat pump, but the rotary heat pump is preferable to the reciprocating heat pump in terms of easy realization of noise reduction and downsizing. In recent years, a heat pump having a structure as disclosed in patent document 1 (japanese patent application laid-open No. 2008-38879) has been proposed.

As shown in fig. 5, the rotary heat pump RHP disclosed in patent document 1 has a structure including two rotary rotors, i.e., a displacer-side rotary rotor DR and a power-side rotary rotor PR. Accordingly, in order to cope with the demand for further miniaturization and weight reduction, the applicant has proposed a structure of a rotary heat pump which is miniaturized and has high performance in PCT/JP 2021/000690. In PCT/JP2021/000690, the expansion regions in the rotary heat pump are communicated with each other by using a bypass path, thereby increasing the volume of space for expansion of the refrigerant gas, thereby improving the efficiency of heat exchange by expansion and compression of the refrigerant gas.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2008-38879 (claims 2, FIG. 1, FIG. 2, etc.)

Disclosure of Invention

Problems to be solved by the invention

Since the rotation driving portion is filled with the lubricating liquid for lubrication of each structure, the lubricating liquid moves in sequence with the movement of the refrigerant gas in the rotation driving portion. In the compression region, a part of the lubricating liquid is gasified and 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 gasified lubricating liquid are cooled, and the refrigerant gas is kept in a gaseous state, and the lubricating liquid may be condensed and retained in the bypass path. Since the lubricating liquid is retained in the bypass path in this way, the problem of insufficient lubrication in the rotary drive unit due to insufficient lubricating liquid in the rotary drive unit becomes apparent.

Solution for solving the problem

Accordingly, an object of the present invention is to provide a rotary heat pump, and an air conditioner and an automobile having the same, in which even if the rotary heat pump has a bypass path that communicates an expansion region in a rotary drive unit, lubrication liquid is not retained in the bypass path, and the rotary drive unit can be lubricated with the lubrication liquid reliably.

That is, the present invention provides a rotary heat pump comprising: a rotation driving unit having a rotation shaft penetrating the fixed gear, a rotor eccentrically rotating with the rotation of the rotation shaft, a rotor having a rotor gear engaged with the fixed gear, the rotor gear being formed to have a larger diameter than an outer diameter of the fixed gear, a rotor housing formed so as to be capable of dividing a radially outer region of the rotor along an epicycloidal curve defined by the eccentric rotation of the rotor, a 1 st side housing having a penetration hole penetrating the rotation shaft and covering one end side of the rotor housing, and the fixed gear being fixed to the 1 st side housing, and a 2 nd side housing covering the other end side of the rotor housing; a heat exchange fin disposed on an outer surface of the rotor case in a compression region having a smallest planar area among regions partitioned by an outer peripheral surface of the rotor and an inner peripheral surface of the rotor case and in an expansion region having a largest planar area among the regions; and a bypass path that communicates the two expansion regions, wherein a section of the bypass path from an uppermost position in a vertical direction in the bypass path to at least one of a 1 st communication portion that communicates with the 1 st expansion region and a 2 nd communication portion that communicates with the 2 nd expansion region is formed by a descending slope portion.

In addition, a rotary heat pump may be provided, the rotary heat pump including: a rotation driving unit having a rotation shaft penetrating the fixed gear, a rotor eccentrically rotating with the rotation of the rotation shaft, a rotor having a rotor gear engaged with the fixed gear, the rotor gear being formed to have a larger diameter than an outer diameter of the fixed gear, a rotor housing formed so as to be capable of dividing a radially outer region of the rotor along an epicycloidal curve defined by the eccentric rotation of the rotor, a 1 st side housing having a penetration hole penetrating the rotation shaft and covering one end side of the rotor housing, and the fixed gear being fixed to the 1 st side housing, and a 2 nd side housing covering the other end side of the rotor housing; a heat exchange fin disposed on an outer surface of the rotor case in a compression region having a smallest planar area among regions partitioned by an outer peripheral surface of the rotor and an inner peripheral surface of the rotor case and in an expansion region having a largest planar area among the regions; and a bypass path that communicates the two expansion regions, wherein a section of the bypass path from an uppermost position in a vertical direction in the bypass path to at least one of a 1 st communication portion that communicates with the 1 st expansion region and a 2 nd communication portion that communicates with the 2 nd expansion region is formed of a horizontal portion and a descending slope portion.

Thus, even if the rotary heat pump has a bypass path that communicates the expansion region in the rotary drive unit, the rotary drive unit can be reliably lubricated by the lubricating liquid without retaining the lubricating liquid in the bypass path.

In addition, it is preferable that the bypass paths are connected to bypass holes formed in at least one of the 1 st side casing and the 2 nd side casing in the expansion region, respectively.

This can suppress an increase in the external dimension due to the bypass path.

In addition, it is preferable that the rotor is a wankel-type rotor, and the rotor housing is a wankel-type rotor housing.

Thus, since a known rotation structure can be adopted, the reliability of the rotation structure can be improved.

There is also an air conditioner in which the rotary heat pump according to any one of the above is mounted, and there is also an automobile in which the air conditioner is mounted.

Thus, an air conditioner and an automobile having a rotary heat pump in which, even if the rotary heat pump has a bypass path that communicates an expansion region in a rotary drive unit, lubrication liquid is not retained in the bypass path, and the rotary drive unit can be reliably lubricated by the lubrication liquid can be provided.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the configuration of the rotary heat pump of the present invention, it is possible to provide a rotary heat pump, an air conditioner and an automobile having the same, in which even if the rotary heat pump has a bypass path for communicating an expansion region in a rotary driving part, lubrication liquid is not retained in the bypass path, and the rotary driving part can be reliably lubricated by the lubrication liquid.

Drawings

Fig. 1 is a front view showing the internal configuration of the rotary heat pump according to embodiment 1 with a perspective of the 2 nd side casing.

Fig. 2A in fig. 2 is a perspective view of the rotary heat pump 100 in embodiment 2, and fig. 2B is a perspective view of the internal structure as seen from the arrow B side in fig. 2A.

Fig. 3 is a schematic view showing an air conditioner in which the rotary heat pump according to the present embodiment is mounted.

Fig. 4 is an explanatory view of an automobile to which the air conditioner shown in fig. 3 is mounted.

Fig. 5 is a schematic configuration diagram of a conventional rotary heat pump.

Detailed Description

Hereinafter, the rotary heat pump 100 according to the present invention will be described with reference to the drawings.

(embodiment 1)

Fig. 1 is a front view showing the internal configuration of the 2 nd side casing 50 of the rotary heat pump 100 according to embodiment 1. The upper side in the drawing of the rotary heat pump 100 in the present embodiment is the vertical direction upper side. The rotary heat pump 100 shown in fig. 1 includes a rotary driving unit 60, heat exchange fins 70 disposed on an outer wall surface of the rotary driving unit 60, and a bypass path 90 that communicates two expansion regions 34 in the rotary driving unit 60. The rotation driving unit 60 of the present embodiment includes a rotation shaft 10, a fixed gear 15, a rotor 20, a rotor housing 30, a 1 st-side housing 40, and a 2 nd-side housing 50. The rotation driving portion 60 has a base portion formed of a metal material and a heat insulating portion 80 formed of a heat insulating material. As can be seen from fig. 1, in the present embodiment, a description is given of a configuration in which the rotary heat pump 100 employs a wankel type vertical rotary drive unit 60.

The 1 st end of the rotary shaft 10 is rotatably supported in the internal space of the rotary drive unit 60, and the 2 nd end protrudes from a through hole (not shown) of the 1 st side housing 40 to the outside of the rotary drive unit 60. The 2 nd end of the rotary shaft 10 is coupled to an output shaft (not shown) of a prime mover provided outside the rotary drive unit 60 by a known method. The fixed gear 15 inserted from the outer surface side of the 1 st side housing 40 and through which the rotary shaft 10 passes is screwed and fixed to the through hole of the 1 st side housing 40. Such a rotary shaft 10 is preferably an eccentric shaft as in a rotary engine.

In the rotor 20 of the present embodiment, at least a required thickness range of the outer surface is formed into a so-called lux triangle external shape (wankel type rotor) by a heat insulating material, and is fitted into the rotor journal 12 formed in the rotary shaft 10 at a 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 at a central portion of the rotor 20 as viewed in plan, and the rotor gear 24 has a larger diameter than the outer diameters of the fixed gear 15 and the fitting hole 22, is formed on the same axis as the fitting hole 22, and is engaged with the fixed gear 15. The fixed gear 15 fixed to the 1 st-side housing 40 and the rotor gear 24 are engaged only within a desired range in the circumferential direction, and therefore, when the rotary shaft 10 rotates, the rotor 20 performs eccentric rotary motion about the rotary shaft 10 (fixed gear 15).

The rotor housing 30 is formed as a cocoon-shaped cylindrical body (wankel rotor housing) capable of dividing a radially outer region of the rotor 20 in a plane along an epicycloidal curve defined by the eccentric rotation of the rotor 20. One opening surface of the rotor case 30 is covered with a 1 st side case 40, and the 1 st side case 40 is formed with a through hole (not shown) through which the fixed gear 15 is inserted into the rotor case 30 (the rotation driving portion 60). The rotary shaft 10 penetrates the fixed gear 15, and the rotary shaft 10, the fixed gear 15, and the 1 st side housing 40 are sealed by a known method.

The 2 nd side case 50 is attached to the other opening surface of the rotor case 30 in a state of being sealed with the rotor case 30. The basic configuration of the rotary drive unit 60 can be the same as that of a so-called rotary engine in which an intake/exhaust unit and an ignition unit are omitted. In the present embodiment, it is preferable that the space surrounded by the rotor 20, the rotor case 30, the 1 st side case 40, and the 2 nd side case 50 is sealed by a sealing member (not shown) which is appropriately disposed. As an example of the refrigerant gas, helium gas is filled in each of the spaces.

Further, heat exchange fins 70 are disposed at a plurality of positions in the circumferential direction on the outer surface of the rotor case 30 so as to span a desired range. In the rotor case 30, the shape and the planar area of the region defined by the inner peripheral surface of the rotor case 30 and the outer peripheral surface of the rotor 20 change with the eccentric rotation of the rotor 20. In the present embodiment, when the rotation shaft 10 is set as the rotation center, two compression regions 32 having the smallest planar area among the divided regions and two expansion regions 34 having the largest planar area among the divided regions are formed, respectively. More specifically, the compression regions 32 and the expansion regions 34 are alternately arranged at 90-degree intervals around the planar center portion of the rotor case 30 as the rotation center in the circumferential direction of the rotor case 30.

The heat radiation fins 72 are provided upright on the outer wall surface of the rotary drive unit 60 at positions corresponding to the compression region 32, which is a high temperature region, and the heat absorption fins 74 are provided upright on the outer wall surface of the rotary drive unit 60 at positions corresponding to the expansion region 34, which is a low temperature region. As described above, the heat exchange fins 70 in the present embodiment are constituted by the heat radiation fins 72 and the heat absorption fins 74, but the heat radiation fins 72 and the heat absorption fins 74 are not erected in all the compression regions 32 and all the expansion regions 34.

The expansion region 34 in the present embodiment is constituted by a 1 st expansion region 34A located on the upstream side in the rotation direction of the rotor 20 and a 2 nd expansion region 34B located on the downstream side in the rotation direction of the rotor 20. The 1 st expansion region 34A and the 2 nd expansion region 34B communicate through a bypass path 90. As shown in fig. 1, a bypass path radiator 92 may be disposed in the bypass path 90. In the present embodiment, the heat absorbing fins 74 are provided upright on the outer peripheral surface of only the 1 st expansion region 34A located immediately behind the compression region 32, out of the 1 st expansion region 34A and the 2 nd expansion region 34B.

In addition, since the compression region 32A at the position sandwiched between the 1 st expansion region 34A and the 2 nd expansion region 34B does not substantially compress helium gas as the refrigerant gas, the compression region 32A at the position sandwiched between the 1 st expansion region 34A and the 2 nd expansion region 34B is excluded from the arrangement targets of the heat radiating fins 72 and the heat insulating portion 80. That is, only the heat radiation fins 72 and at least the heat radiation fins 72 in the heat insulating portion 80 are disposed in the compression region 32 located immediately behind the expansion region 34 (in this case, the 2 nd expansion region 34B) at the most downstream position, out of the plurality of expansion regions 34 (in this case, the 1 st expansion region 34A and the 2 nd expansion region 34B) which communicate through the bypass path 90. With such a configuration, the weight reduction and the reduction in manufacturing cost of the rotary heat pump 100 can be facilitated.

The bypass path 90 in the present embodiment is connected to the bypass hole 34C, and the bypass hole 34C is provided through the rotor case 30 in the 1 st expansion region 34A and the 2 nd expansion region 34B located above the 1 st expansion region 34A in the vertical direction. By communicating the 1 st expansion region 34A and the 2 nd expansion region 34B in this way, the volume of the space in which the helium gas sent from the compression region 32 expands can be greatly increased, and a temperature decrease due to expansion of the helium gas can be promoted. More specifically, the longitudinal gradient of the bypass path 90 from the uppermost position 94 in the vertical direction of the bypass path 90 to the 1 st expansion region 34A and the 2 nd expansion region 34B is a decreasing gradient. In other words, the descending slope portion 96 communicates with each other, and the descending slope portion 96 gradually decreases in height position in the vertical direction in the bypass path 90 from the uppermost position 94 in the vertical direction in the bypass path 90 toward the bypass hole 34C as the 1 st communicating portion communicating with the 1 st expansion region 34A and the bypass hole 34C as the 2 nd communicating portion communicating with the 2 nd expansion region 34B.

When the rotation driving unit 60 is driven to rotate by a prime mover, not shown, helium gas, which is a refrigerant gas filled in the internal space of the rotation driving unit 60, is sequentially sent to the compression region 32 and the 1 st expansion region 34A and the 2 nd expansion region 34B alternately appearing in the circumferential direction of the rotor case 30, thereby alternately switching the high temperature state and the low temperature state. The helium gas sent from the compression region 32 is mixed with a lubricating liquid typified by vaporized lubricating oil, and if the helium gas is sent to the 1 st expansion region 34A and the 2 nd expansion region 34B and the bypass path 90 connecting them, the lubricating liquid condenses due to a decrease in temperature. In the present embodiment, even if the lubricating liquid condenses in the bypass path 90, the lubricating liquid can flow down from the uppermost position 94 in the bypass path 90 to the 1 st expansion region 34A and the 2 nd expansion region 34B, respectively, by the descending slope portion 96 under the action of gravity. Therefore, the lubricating liquid does not remain in the bypass path 90, and a reliable lubricating action of the lubricating liquid on the rotary drive unit 60 can be maintained.

By adopting the form of the rotary heat pump 100 in the present embodiment, a heat pump structure of a full vapor phase carnot cycle that can reliably lubricate the rotary drive unit 60 can be provided. The rotor 20 in the present embodiment can perform heat radiation 1 time and heat absorption 1 time, respectively, during one rotation of the inner space of the rotor case 30. Accordingly, the heat exchanger can perform heat exchange efficiently, although the heat exchanger has a small and lightweight structure and low noise. Further, it is also preferable in this regard that rapid heating and rapid cooling can be performed by increasing the rotation of the output shaft of the prime mover to increase the rotation speed of the rotor 20. Further, the lubrication liquid injected into the rotation driving portion 60 is not retained in the bypass path 90, and the lubrication action of the rotation driving portion 60 can be performed all the time, and thus, the rotation heat pump 100 with high reliability can be provided.

(embodiment 2)

Fig. 2A is a perspective view of the rotary heat pump 100 in embodiment 2, and fig. 2B is a perspective view of the internal structure as seen from the arrow B side in fig. 2A. In fig. 2, the heat radiation fins 72, the heat absorption fins 74, the heat insulation portions 80, and the like are omitted for simplicity of illustration, but the heat radiation fins 72, the heat absorption fins 74, the heat insulation portions 80, and the like can be disposed in the same manner as in embodiment 1. In this embodiment, the same reference numerals as those used in the previous embodiments are given to the same structures as those of the other embodiments described above, and detailed description thereof is omitted. The rotary heat pump 100 according to the present embodiment is different from the rotary heat pump 100 according to embodiment 1 in the arrangement in which the rotation shaft 10 is erected in the orthogonal direction (vertical direction) with respect to the installation surface.

The 1 st expansion region 34A and the 2 nd expansion region 34B in the present embodiment have the same height position in the vertical direction, and are communicated by a bypass path 90 formed in the inverted japanese kana コ type and communicating with each other. The uppermost position 94 in the vertical direction of the bypass path 90 in the present embodiment is formed at a horizontal portion extending over a desired length range, and the bypass path 90 is connected at both ends of the horizontal portion with a descending slope portion 96 communicating with the 1 st expansion region 34A and the 2 nd expansion region 34B. Thus, even if there is a horizontal portion in the bypass path 90 due to the layout of the bypass path 90, the lubrication fluid flows down from the descent slope portion 96 having an extension length twice or more the extension length of the horizontal portion to the 1 st expansion region 34A and the 2 nd expansion region 34B, and the stagnation of the lubrication fluid in the horizontal portion of the bypass path 90 does not affect the lubrication of the rotation driving portion 60. Further, by forming the bypass path 90 with a material having hydrophilicity with the lubricating liquid or subjecting the inner peripheral surface of the bypass path 90 to a surface treatment for improving hydrophilicity with the lubricating liquid, it is also possible to promote the flow-down of the lubricating liquid in the bypass path 90.

As described above, the rotary heat pump 100 according to the present invention is described based on the embodiments, but the present invention is not limited to the above embodiments. For example, the rotary heat pump 100 of the above-described embodiment has been described using the form of the wankel rotary drive unit 60, but the present invention is not limited to this structure, and a known structure of the rotary drive unit 60 can be used as appropriate. In the case where there are a plurality of expansion regions 34 in the structure of the rotation driving unit 60, three or more expansion regions 34 may be communicated with each other through the bypass path 90. In this case, since the substantial compression of the refrigerant gas is not performed in the compression region 32A at the position sandwiched by the expansion regions 34 communicating with the bypass passage 90, the heat radiation fins 72 can be omitted from being disposed in these compression regions 32A. The layout of the bypass path 90 and the communication portion communicating with the bypass path 90 in the plurality of expansion regions 34 communicating through the bypass path 90 can be the same as the above-described embodiment.

As shown in fig. 1 and 2, the rotary heat pump 100 according to the above embodiment includes the bypass hole 34C in the rotor case 30 in the 1 st expansion region 34A and the 2 nd expansion region 34B, and the bypass hole 34C is defined as the 1 st communication portion and the 2 nd communication portion, but the present invention is not limited to this configuration. Instead of the bypass holes 34C provided in the rotor case 30 as the 1 st communication portion and the 2 nd communication portion, a through hole (not shown) penetrating through the 1 st side case 40 in the plate thickness direction may be provided as the 1 st communication portion and the 2 nd communication portion, and the through holes in the plurality of expansion regions 34 may be connected to each other through the bypass path 90. The through hole may be provided not only in the 1 st side case 40 but also in the 2 nd side case 50 or in the 1 st side case 40 and the 2 nd side case 50. By disposing the bypass passage 90 in the planar region of the rotary drive unit 60 in this manner, the area dedicated to the planar surface can be reduced as compared with the rotary heat pump 100 of the present embodiment.

In embodiment 1, the bypass path 90 is provided with the bypass path radiator 92, and the bypass path 90 is configured to be able to exchange heat (absorb heat), but the present invention is not limited to this configuration. The bypass path 90 may be formed of a heat insulating material, or may be formed by omitting the arrangement of the bypass path radiator 92 as shown in fig. 2.

In the above embodiment, the layout in which the rotation axis 10 is rotated 90 degrees with respect to the plumb line (embodiment 1) and the layout in which the rotation axis 10 is parallel to the plumb line (embodiment 2) are exemplified, but the present invention is not limited to the above layout. The rotary heat pump 100 may be configured to have an intermediate layout between the layouts shown in embodiment 1 and embodiment 2. In short, as long as the lubricating liquid is not retained in the bypass path 90 that communicates the 1 st expansion region 34A and the 2 nd expansion region 34B, the bypass path 90 may be formed only by the descending slope portion 96 with respect to any one of the 1 st expansion region 34A and the 2 nd expansion region 34B, or the bypass path 90 may be formed by the descending slope portion 96 and a small number of horizontal portions.

In the above embodiments, the bypass passage 90 is shown in a form in which the bypass hole 34C, which is the 1 st communication portion communicating with the 1 st expansion region 34A, from the uppermost position 94 in the vertical direction and the bypass hole 34C, which is the 2 nd communication portion communicating with the 2 nd expansion region 34B, from the uppermost position 94 in the vertical direction are both communicated by the descending slope portion 96, but the present invention is not limited to this form. It is also possible to adopt a configuration in which only one of the bypass hole 34C from the uppermost position 94 of the bypass passage 90 to the 1 st expansion region 34A and the bypass hole 34C from the uppermost position 94 to the 2 nd expansion region 34B communicates with each other by the descent gradient portion 96.

In embodiment 2, 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 present invention is not limited to this configuration. The horizontal portion may be disposed midway along the descending slope portion 96.

In the present embodiment, the description has been made of the case where helium gas having a high thermal conductivity is filled into the rotary driving unit 60 as the refrigerant gas, but the refrigerant gas having such characteristics is not limited to helium gas, and a known refrigerant gas such as hydrogen gas or carbon dioxide gas can be used appropriately.

As shown in fig. 4, there is also an air conditioner 200 on which the above-described rotary heat pump 100 is mounted. As shown in fig. 5, there is also an automobile 300 to which the air conditioner 200 having the rotary heat pump 100 described in the present embodiment is attached. Since the specific structures of the air conditioner 200 and the automobile 300 are well known, a detailed description thereof will be omitted herein. In addition, according to the air conditioner 200 of the present invention, it is possible to achieve downsizing, weight saving and high efficiency. In addition, according to the automobile 300 of the present invention, in addition to the downsizing and weight saving, the vehicle-mounted system is greatly energy-saving, and thus the electric motor of the automobile 300 can be promoted.

The rotary heat pump 100 described above may be arranged in series in the axial direction of the rotary shaft 10. Accordingly, although the occupied volume of the rotary heat pump 100 is increased, if a long and thin space can be ensured, the rotary heat pump 100, the air conditioner 200 and the automobile 300 having the rotary heat pump 100 mounted thereon can be provided with higher performance.

Further, the configuration of the present embodiment described above may be a configuration in which modifications described in the specification and other known configurations are appropriately combined.

Claims

1. A rotary heat pump is characterized in that,

the rotary heat pump is provided with:

a rotation driving unit having a rotation shaft penetrating the fixed gear, a rotor eccentrically rotating with the rotation of the rotation shaft, a rotor having a rotor gear engaged with the fixed gear, the rotor gear being formed to have a larger diameter than an outer diameter of the fixed gear, a rotor housing formed so as to be capable of dividing a radially outer region of the rotor along an epicycloidal curve defined by the eccentric rotation of the rotor, a 1 st side housing having a penetration hole penetrating the rotation shaft and covering one end side of the rotor housing, and the fixed gear being fixed to the 1 st side housing, and a 2 nd side housing covering the other end side of the rotor housing;

a heat exchange fin disposed on an outer surface of the rotor case in a compression region having a smallest planar area among regions partitioned by an outer peripheral surface of the rotor and an inner peripheral surface of the rotor case and in an expansion region having a largest planar area among the regions; and

a bypass path that communicates the two expansion regions,

a section of the bypass path from an uppermost position in a vertical direction in the bypass path to at least one of a 1 st communication portion communicating with a 1 st expansion region and a 2 nd communication portion communicating with a 2 nd expansion region is formed by a descending slope portion.

2. A rotary heat pump is characterized in that,

the rotary heat pump is provided with:

a bypass path that communicates the two expansion regions,

a section of the bypass path from an uppermost position in a vertical direction in the bypass path to at least one of a 1 st communication portion communicating with a 1 st expansion region and a 2 nd communication portion communicating with a 2 nd expansion region is formed by a horizontal portion and a descending slope portion.

3. A rotary heat pump according to claim 1 or 2, wherein,

the bypass paths are respectively connected to bypass holes formed in at least one of the 1 st side casing and the 2 nd side casing in each of the expansion regions.

4. A rotary heat pump according to any one of claims 1 to 3 wherein,

the rotor is a wankel-type rotor and the rotor housing is a wankel-type rotor housing.

5. An air conditioner is characterized in that,

the air conditioner is equipped with the rotary heat pump according to any one of claims 1 to 4.

6. An automobile is characterized in that,

the automobile is provided with the air conditioner of claim 5.