Rotary drive unit and rotary heat pump

Abstract

The present invention addresses the problem of providing a rotary drive unit and a rotary heat pump capable of minimizing outward extension of the rotary drive unit as much as possible and preventing undesired inflow of refrigerant into a compression region. As a solution, a rotary drive unit (10) and a rotary heat pump (100) having the rotary drive unit (10) are provided, the rotary drive unit (10) being characterized in that an inner wall surface of a rotary housing (15) of the rotary drive unit (10) includes at least one compression region (HA1) and is formed with a groove (15A) continuous between a foremost expansion region (LA1) and a rearmost expansion region (LA2). And a forward-most expansion region (LA1) adjacent to the forward side of the compression region (HA1) located at the forward-most position in the rotation direction of the rotor (13) among the compression regions (HA1), and a rearmost expansion region (LA2) adjacent to the rearmost side of the compression region (HA1) located at the rearmost position in the rotation direction of the rotor (13).

Description

Technical Field

[0001] The present invention relates to a rotary drive unit and a rotary heat pump. Background Art

[0002] As an example of a rotary heat pump having a rotary drive unit, there is known a structure disclosed in Patent Document 1 (Japanese Patent No. 7007776) by the present applicant.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 7007776 (Claim 1, paragraphs 0029 to 0031 of the specification, Figure 2 wait) Summary of the invention

[0006] Problem that the invention aims to solve

[0007] In the rotary heat pump disclosed in Patent Document 1, since the bypass path connecting the two compression areas extends radially outward from the radial direction of the rotary drive unit, it is difficult to miniaturize the rotary drive unit and the rotary heat pump. In addition, although the bypass path is used to prevent the refrigerant from flowing into the compression area sandwiched by the two expansion areas, there is also the following problem: not all the refrigerant can flow into the bypass path, but a part of the refrigerant flows into the compression area, which reduces the cooling efficiency.

[0008] Solutions for solving problems

[0009] Therefore, an object of the present invention is to provide a rotary drive unit and a rotary heat pump which can reduce the radial extension of the bypass passage to the outside of the rotary drive unit as much as possible and prevent the undesired inflow of refrigerant into the compression region.

[0010] That is, the present invention provides a rotary drive unit, which has: a rotary shaft; a fixed gear, the rotary shaft passes through the fixed gear; a rotor, which has a rotor gear, the rotor gear is formed to have a diameter larger than the outer diameter of the fixed gear, the rotor gear meshes with the fixed gear, and the rotor rotates eccentrically with the rotation of the rotary shaft; a rotary shell, which is formed to be able to divide the radial outer area of ​​the rotor along the epicycloid curve specified by the eccentric rotation of the rotor; a first side shell, which has a through hole for the rotary shaft to pass through, and covers one end side of the rotary shell; and a second side shell, which covers the other end side of the rotary shell, the rotary drive unit is characterized in that the inner wall surface of the rotary shell includes at least one compression area, and a groove is formed continuously between the frontmost expansion area and the rearmost expansion area, the frontmost expansion area is adjacent to the front side of the compression area at the frontmost position of the compression area in the rotation direction of the rotor, and the rearmost expansion area is adjacent to the rear side of the compression area at the rearmost position of the compression area in the rotation direction of the rotor.

[0011] In this way, the groove formed along the inner wall surface of the rotating shell is used to connect the front expansion area and the rear expansion area in the rotation direction of the rotor, so that the range where the groove is formed can be set as one expansion area. As a result, the radial extension amount of the rotary drive unit can be greatly suppressed to achieve miniaturization. In addition, the inflow of undesired refrigerant into the compression area can be reliably prevented.

[0012] In addition, it is preferable that a heat sink plate is installed in a range where the groove is formed and in a range corresponding to the compressed region where the groove is not formed in the outer wall surface of the rotating housing.

[0013] Thereby, the efficiency of heat exchange is improved.

[0014] In addition, an invention of a rotary heat pump is provided, which has a rotary drive unit and a motor, wherein the rotary drive unit has: a rotary shaft; a fixed gear, the rotary shaft passes through the fixed gear; a rotor, which has a rotor gear, the rotor gear is formed to have a diameter larger than the outer diameter of the fixed gear, the rotor gear meshes with the fixed gear, and the rotor rotates eccentrically with the rotation of the rotary shaft; a rotary housing, which is formed to be able to divide the radial outer area of ​​the rotor along the epicycloidal curve specified by the eccentric rotation of the rotor; a first side housing, which has a through hole for the rotary shaft to pass through, covering Cover one end side of the rotating shell; and a second side shell, which covers the other end side of the rotating shell, the inner wall surface of the rotating shell includes at least one compression area, and a continuous groove is formed between the frontmost expansion area and the rearmost expansion area, the frontmost expansion area is adjacent to the front side of the compression area in the compression area which is at the frontmost position in the rotation direction of the rotor, and the rearmost expansion area is adjacent to the rear side of the compression area in the compression area which is at the rearmost position in the rotation direction of the rotor, and the output shaft of the motor is connected to the rotating shaft.

[0015] In this way, the groove formed along the inner wall of the rotating shell is used to connect the front expansion area and the rear expansion area in the rotation direction of the rotor, so that the range where the groove is formed can be set as one expansion area. As a result, the radial extension amount of the rotary heat pump can be greatly suppressed to achieve miniaturization. In addition, the inflow of undesired refrigerant into the compression area can be reliably prevented.

[0016] In addition, it is preferable that a heat sink plate is installed in a range where the groove is formed and in a range corresponding to the compressed region where the groove is not formed in the outer wall surface of the rotating housing.

[0017] Moreover, it is more preferred that a heat exchanger is installed on the heat sink, the rotary drive unit, the motor and the heat exchanger are housed in a shell with the refrigerant inlet and the refrigerant discharge outlet of the heat exchanger exposed to the external space, and the interior of the shell is filled with gas at a specified pressure.

[0018] This improves the efficiency of heat exchange in the rotary heat pump.

[0019] Effects of the Invention

[0020] According to the structure of the rotary drive unit and the rotary heat pump in the present invention, the groove formed along the inner wall surface of the rotary shell is used to connect the front expansion area and the rear expansion area in the rotation direction of the rotor, so that the range where the groove is formed can be set as one expansion area. As a result, the radial extension amount of the rotary heat pump can be greatly suppressed to achieve miniaturization. In addition, the inflow of undesired refrigerant into the compression area can be reliably prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an assembly perspective view of the rotary heat pump according to the present embodiment.

[0022] Figure 2 This is an assembled perspective view of the rotary heat pump showing a state in which the rotary drive unit and the heat exchanger are separated.

[0023] Figure 3 It is a front view showing the internal structure of the rotation drive unit.

[0024] Figure 4 yes Figure 2 3D diagram of the assembly of the rotary drive unit.

[0025] Figure 5 It is a bottom perspective view of the rotating housing.

[0026] Figure 6 It is a perspective view of the assembled rotary heat pump according to the present embodiment. DETAILED DESCRIPTION

[0027] Hereinafter, the rotary drive unit 10 of the present invention and the rotary heat pump 100 having the rotary drive unit 10 will be described. Figure 1 , Figure 2 As shown, a rotary heat pump 100 in the present embodiment includes a rotary drive unit 10 , a heat exchanger 20 , a motor 30 , and a housing 40 that accommodates these.

[0028] like Figure 1 to Figure 4 As shown, the rotary drive unit 10 of this embodiment includes a rotary shaft 11, a fixed gear 12, a rotor 13, a rotor gear 14, a rotary housing 15, a first side housing 16, a second side housing 17, a first heat exchanger mounting plate 18, and a second heat exchanger mounting plate 19. The rotary shaft 11 passes through a through hole 16A of the first side housing 16 covering an opening surface on one end side of the rotary housing 15, and passes through a through hole 17A of the second side housing 17 covering an opening surface on the other end side of the rotary housing 15. The rotary shaft 11 is sealed at the positions of the through hole 16A and the through hole 17A, and the inside and the outside of the rotary housing 15 are blocked.

[0029] The rotating shaft 11 penetrates in a coaxial manner with the center hole (through hole 16A) of the fixed gear 12 mounted on the through hole 16A of the first side housing 16 by screw fastening or the like. In addition, a rotor 13 is accommodated inside the rotating housing 15, and a rotor gear 14 formed to have a diameter larger than the outer diameter of the fixed gear 12 is assembled to the rotor 13. The fixed gear 12 is always meshed with the rotor gear 14 in a required range in the circumferential direction. The rotating shaft 11 is embedded in the rotor gear 14, and the rotating shaft 11 and the rotor 13 are integrated. In addition, the top end 11A of the rotating shaft 11 is connected to the output shaft 32 of the motor 30 via a gear or a pin, etc., so that the output of the motor 30 can be transmitted to the rotating shaft 11, which is not shown in detail.

[0030] By rotating the rotating shaft 11 by the motor 30, the rotor gear 14 embedded in the rotating shaft 11 moves within the meshing range with the fixed gear 12 while eccentrically rotating along the inner circumferential surface of the rotating housing 15 (formed to be able to divide the radial outer area of ​​the rotor 13) formed by the epicycloid curve. In addition, inside the rotating housing 15, a closed space is formed, which is an area surrounded by the outer circumferential surface of the rotor 13, the inner wall surface of the rotating housing 15, the first side housing 16, and the second side housing 17, as in the rotary engine. Helium gas, which is an example of a refrigerant, is filled in each closed space. In addition, the refrigerant is not limited to helium gas, and a known refrigerant can be used.

[0031] When the rotor 13 rotates inside the rotating housing 15, the volume of the closed space is alternately repeatedly reduced (compression region) and expanded (expansion region) at a predetermined position in the circumferential direction of the rotating housing 15. Compression regions HA1 and HA2 where the volume of the closed space is the smallest and becomes a high temperature region are formed at a predetermined position in the rotation direction of the rotor 13 of the rotary drive unit 10, and expansion regions LA1 and LA2 where the volume of the closed space is the largest and becomes a low temperature region are formed. As described above, the rotary drive unit 10 in this embodiment functions as a heat pump by the refrigerant filled in the above-mentioned closed space.

[0032] like Figure 4 , Figure 5As shown, a groove 15A is formed on the inner wall surface of the rotating housing 15, which is continuous between the expansion area LA1 (equivalent to the frontmost expansion area) and the expansion area LA2 (equivalent to the rearmost expansion area). The expansion area LA1 and the expansion area LA2 are adjacent to the upper compression area HA1 in front and rear of the rotation direction of the rotor 13. The groove 15A continuous in the circumferential direction of the rotating housing 15 becomes a bypass path, and the compression area HA1, the expansion area LA1 and the expansion area LA2 are connected respectively, forming an expansion area LA and a compression area HA2 inside the rotating housing 15. The groove 15A is always opposite to the inner wall surface of the rotating housing 15, so that the lubricating oil of the rotating drive unit 10 can be prevented from being retained in the groove 15A.

[0033] The outer wall surface of the rotating housing 15 in this embodiment has an outer protrusion 15B that slightly protrudes the formation range of the groove 15A to the outside, but the present invention is not limited to this form. In the case where the wall thickness of the rotating housing 15 is sufficiently ensured or the groove 15A can be formed shallowly, the outer protrusion 15B of the rotating housing 15 can be eliminated even within the formation range of the groove 15A.

[0034] The circumferential range of the expansion area LA in the rotary drive unit 10 in the present embodiment can be set to a range that is more than twice the circumferential range of the compression area HA2, and the expansion area LA and the compression area HA2 can be clearly separated and configured in the circumferential direction of the rotary drive unit 10. In addition, the first heat exchanger mounting plate 18 can also be installed in the circumferential range corresponding to the expansion area LA in the outer wall surface of the rotating shell 15. In addition, the second heat exchanger mounting plate 19 can also be installed in the circumferential range corresponding to the compression area HA2 in the outer wall surface of the rotating shell 15. The depth direction dimension (axial length direction of the rotating shaft 11) of the first heat exchanger mounting plate 18 and the second heat exchanger mounting plate 19 is preferably longer than the depth direction dimension of the rotary drive unit 10. The first heat exchanger mounting plate 18 and the second heat exchanger mounting plate 19 both function as heat sinks and are therefore formed of a material with a high thermal conductivity.

[0035] A first heat exchanger 22 constituting a part of the heat exchanger 20 is mounted on the outer surface of the first heat exchanger mounting plate 18. As the first heat exchanger 22, a brazed plate heat exchanger can be exemplified in which a plurality of plates 22A having flow paths and through holes are stacked in the plate thickness direction and the plates 22A at both ends in the stacking direction are provided with a first refrigerant inlet 22B and a first refrigerant outlet 22C. In addition, a second heat exchanger 24 constituting a part of the heat exchanger 20 together with the first heat exchanger 22 is mounted on the outer surface of the second heat exchanger mounting plate 19. The second heat exchanger 24 can also be a brazed plate heat exchanger having a plate 24A, a second refrigerant inlet 24B, and a second refrigerant outlet 24C, similarly to the first heat exchanger 22.

[0036] The rotary drive unit 10 with the heat exchanger 20 installed thereon is housed together with the motor 30 in the housing 40. Figure 6 As shown, the first refrigerant inlet 22B, the first refrigerant outlet 22C, the second refrigerant inlet 24B, and the second refrigerant outlet 24C are exposed to the external space of the shell 40. The shell 40 has a main body 42 and a cover 44, and the first refrigerant inlet 22B, the first refrigerant outlet 22C, the second refrigerant inlet 24B, and the second refrigerant outlet 24C are integrated with the main body 42 in an airtight state by welding, etc., and the main body 42 and the cover 44 are integrated in an airtight state by welding, etc. In addition, the inside of the shell 40 is filled with helium (refrigerant) at a predetermined pressure (preferably about 30 to 100 atmospheres).

[0037] In addition, the first end of the first refrigerant supply path is connected to the first refrigerant discharge port 22C of the first heat exchanger 22, and a cooling object and a first pump are arranged on the path of the first refrigerant supply path, which are not shown in the figure. In addition, the second end of the first refrigerant supply path is connected to the first refrigerant inlet 22B. In this way, a circulation path is formed in the first heat exchanger 22 through the first refrigerant supply path. Thus, the cooling object can be cooled by the refrigerant cooled by the rotary heat pump 100. The first pump is controlled by an action control unit not shown in the figure.

[0038] The first end of the second refrigerant supply path is connected to the second refrigerant discharge port 24C of the second heat exchanger 24, and a radiator represented by a heat sink and a second pump are arranged on the path of the second refrigerant supply path, which are also not shown. In addition, the second end of the second refrigerant supply path is connected to the second refrigerant inlet 24B. In this way, a circulation path is formed in the second heat exchanger 24 through the second refrigerant supply path. As a result, the refrigerant heated by the rotary heat pump 100 can be cooled by external air. The second pump is controlled by an action control unit not shown.

[0039] According to the rotary housing 15 of the present embodiment, a plurality of expansion regions and a compression region between the plurality of expansion regions can be formed into one expansion region by means of the groove 15A formed on the inner wall surface of the rotary housing 15. Therefore, the amount of the rotary drive unit 10 (rotating housing 15) protruding to the outside due to the bypass path can be reduced as much as possible. That is, the reduction in heat exchange efficiency caused by the inflow of undesirable refrigerant into the compression region can be prevented as much as possible, and a small heat pump with high heat exchange efficiency can be provided.

[0040] As described above, the rotary drive unit 10 of the present invention and the rotary heat pump 100 having the rotary drive unit 10 are described based on the embodiments, but the present invention is not limited to the above embodiments. For example, in the above-described embodiments, a method in which the first heat exchanger mounting plate 18 and the second heat exchanger mounting plate 19 are mounted on the outer wall surface of the rotating shell 15 is shown, but the structure of the first heat exchanger mounting plate 18 and the second heat exchanger mounting plate 19 can also be omitted. In this case, the base of the plate 22A of the first heat exchanger 22 and the plate 24A of the second heat exchanger 24 have a shape consistent with the outer wall surface of the rotating shell 15. In addition, when the first heat exchanger 22 and the second heat exchanger 24 are mounted on the outer wall surface of the rotating shell 15, a thermally conductive adhesive can also be used.

[0041] In addition, the rotary heat pump 100 in the above embodiment illustrates a method in which the rotary drive unit 10, the heat exchanger 20 and the motor 30 are housed inside the shell 40, but is not limited to this method. The following method can be adopted: the rotary drive unit 10 and the heat exchanger 20 are housed inside the shell 40, the motor 30 is arranged outside the shell 40, and the output shaft 32 of the motor 30 passes from the outside of the shell 40 to the inside and is connected to the rotating shaft 11. In addition, a method in which the output shaft 32 and the rotating shaft 11 are connected by a magnetic coupler can also be adopted. In addition, the rotary heat pump 100 can also be adopted in a method in which it is not housed inside the shell 40.

[0042] Furthermore, in the case of using a rotating shell 15 having three or more expansion areas, the following method can be adopted: within the circumferential range including the three or more expansion areas and the two or more compression areas located between them, the frontmost expansion area and the rearmost expansion area are connected by a circumferentially continuous groove 15A, the frontmost expansion area is adjacent to the compression area at the frontmost position in the rotation direction of the rotor 13 on the front side, and the rearmost expansion area is adjacent to the compression area at the rearmost position in the rotation direction of the rotor 13 on the rear side. Preferably, in any case, there is only one compression space inside the rotating shell 15 where the refrigerant is actually compressed.

[0043] Furthermore, it is also possible to adopt a mode in which the modified examples described in the specification and other well-known structures are appropriately combined with the structure of the present embodiment described above.

Claims

1. A rotary drive unit, comprising: a rotary shaft; a fixed gear, the rotary shaft passing through the fixed gear; a rotor having a rotor gear, the rotor gear being formed to have a diameter dimension larger than an outer diameter dimension of the fixed gear, the rotor gear being meshed with the fixed gear, the rotor rotating eccentrically with the rotation of the rotary shaft; a rotary housing formed to be able to divide a radially outer region of the rotor along an epicycloidal curve defined by the eccentric rotation of the rotor; a first side housing having a through hole for the rotary shaft to pass through, the housing covering one end of the rotary housing; and a second side housing covering the other end of the rotary housing, The rotary drive unit is characterized in that The inner wall surface of the rotating shell includes at least one compression area, and a continuous groove is formed between the frontmost expansion area and the rearmost expansion area, the frontmost expansion area is adjacent to the front side of the compression area in the compression area which is at the frontmost position in the rotation direction of the rotor, and the rearmost expansion area is adjacent to the rear side of the compression area in the compression area which is at the rearmost position in the rotation direction of the rotor.

2. The rotary drive unit according to claim 1, characterized in that: A heat dissipation plate is installed in a range where the groove is formed in the outer wall surface of the rotating housing and in a range corresponding to the compression region where the groove is not formed.

3. A rotary heat pump, characterized in that: The rotary heat pump includes a rotary drive unit and a motor. The rotary drive unit includes: a rotary shaft; a fixed gear, the rotary shaft passes through the fixed gear; a rotor, which includes a rotor gear, the rotor gear is formed to have a diameter larger than the outer diameter of the fixed gear, the rotor gear meshes with the fixed gear, and the rotor rotates eccentrically with the rotation of the rotary shaft; a rotary housing, which is formed to be able to divide the radial outer area of ​​the rotor along the epicycloid curve specified by the eccentric rotation of the rotor; a first side housing, which has a through hole for the rotary shaft to pass through, and covers one end side of the rotary housing; and a second side housing, which covers the other end side of the rotary housing, The inner wall surface of the rotating shell includes at least one compression area, and a groove is formed continuously between the frontmost expansion area and the rearmost expansion area, the frontmost expansion area is adjacent to the front side of the compression area at the frontmost position in the rotation direction of the rotor in the compression area, and the rearmost expansion area is adjacent to the rear side of the compression area at the rearmost position in the rotation direction of the rotor in the compression area. An output shaft of the motor is connected to the rotating shaft.

4. The rotary heat pump according to claim 3, characterized in that: A heat dissipation plate is installed in a range where the groove is formed in the outer wall surface of the rotating housing and in a range corresponding to the compression region where the groove is not formed.

5. The rotary heat pump according to claim 4, characterized in that: A heat exchanger is installed on the heat sink. The rotary drive unit, the motor, and the heat exchanger are housed in a casing in a state where a refrigerant inlet and a refrigerant outlet of the heat exchanger are exposed to an external space, and the interior of the casing is filled with a gas at a predetermined pressure.

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