WO2008062839A1

WO2008062839A1 - Fluid machine

Info

Publication number: WO2008062839A1
Application number: PCT/JP2007/072576
Authority: WO
Inventors: Eiji Kumakura; Katsumi Sakitani
Original assignee: Daikin Industries, Ltd.
Priority date: 2006-11-24
Filing date: 2007-11-21
Publication date: 2008-05-29
Also published as: JP4997935B2; JP2008128183A; EP2098730A4; ES2536770T3; EP2098730A1; EP2098730B1

Abstract

A compression mechanism (50) for compressing a refrigerant, an expansion mechanism (60) for expanding the refrigerant, and a rotating shaft (40) for connecting the compression mechanism (50) and the expansion mechanism (60) are stored in a casing (31). The expansion mechanism (60) is fixed to the casing (31) by a mounting plate (101).

Description

Specification

Fluid machinery

Technical field

[0001] The present invention relates to a fluid machine housed in a casing having a compression mechanism and an expansion mechanism.

Background art

Conventionally, a fluid machine in which an expansion mechanism, an electric motor, and a compression mechanism are connected by a single rotating shaft is known. In this fluid machine, power is generated in the expansion mechanism by expansion of the introduced fluid. The power generated by the expansion mechanism is transmitted to the compression mechanism by the rotating shaft together with the power generated by the electric motor. The compression mechanism is driven by the power transmitted from the expansion mechanism and the electric motor, and sucks and compresses the fluid.

In such a fluid machine, the expansion mechanism is heated by the fluid discharged from the high-temperature compressor. As a result, in hot water supply applications, the temperature of discharged hot water decreases due to a decrease in discharge gas temperature. In air-conditioning applications, the blowing temperature during heating decreases and the capacity decreases during cooling. As for the expansion mechanism itself, the power recovery effect is offset by internal heat loss.

[0004] Therefore, in order to prevent such problems of reduced capacity and reduced power recovery effect, for example, Patent Document 1 discloses a technique of attaching a heat insulating material to the expansion mechanism side. Patent Document 1: Japanese Patent Laid-Open No. 2005-106064

Disclosure of the invention

Problems to be solved by the invention

[0005] However, with only the heat insulating material of Patent Document 1 described above, the heat generated by the compression mechanism is transmitted and the heat is transmitted from the casing side wall, which is heated, through solid heat conduction that flows into the expansion mechanism via the front head. It cannot prevent heat. That is, since the expansion mechanism, the casing, and the members (including the welded portion) for fixing both are generally made of a metal material, the thermal conductivity is high. For this reason, there is a problem that heat exchange occurs between the low-temperature refrigerant inside the expansion mechanism and the high-temperature refrigerant inside the compression mechanism through the metal material.

[0006] The present invention has been made in view of the force and the point, and the object of the present invention is compression. In a fluid machine in which the mechanism and the expansion mechanism are housed in one casing, heat exchange between the expansion mechanism or the compression mechanism and the casing can be prevented by devising the compression mechanism or the fixing structure of the expansion mechanism. Means for solving the problems in preventing the decline in capacity and power recovery effect

In order to achieve the above object, according to the present invention, the compression mechanism (50) or the expansion mechanism (60) is fixed to the casing (31) via the mounting plate (101).

[0008] Specifically, the first invention is directed to a fluid machine provided in a refrigerant circuit (20) that performs a refrigeration cycle by circulating refrigerant.

[0009] The fluid machine includes a casing (31), a compression mechanism (50) accommodated in the casing (31) and compresses the refrigerant, and an expander accommodated in the casing (31) and expands the refrigerant. A structure (60), a rotary shaft (40) provided on the casing (31) and connecting the compression mechanism (50) and the expansion mechanism (60), and the compression mechanism (50) or the expansion mechanism (60) And a mounting plate (101) for fixing to the casing (31).

[0010] According to the above configuration, the refrigerant compressed by the compression mechanism (50) of the fluid machine (30) provided in the refrigerant circuit (20) is radiated by the heat exchanger for heat dissipation, and then the fluid machine (30 ) Into the expansion mechanism (60). In the expansion mechanism (60), the high-pressure refrigerant that has flowed in expands. The power recovered from the high-pressure refrigerant by the expansion mechanism (60) is transmitted to the compression mechanism (50) by the rotation shaft (40) and used to drive the compression mechanism (50). The refrigerant expanded by the expansion mechanism (60) absorbs heat by the heat exchanger for heat absorption and then is sucked into the compression mechanism (50) of the fluid machine (30).

[0011] By the mounting plate (101), the compression mechanism (50) or the expansion mechanism (60) is firmly fixed to the casing (31), thereby preventing the casing (31) from bulging and the compression mechanism (50 ) Or excessive vibration of the expansion mechanism (60) is prevented.

[0012] At this time, the expansion mechanism (60) is kept at a low temperature and the compression mechanism (50) is kept at a high temperature, so that a temperature difference occurs between them. The difference between the surface temperature of the compression mechanism (50) and the temperature of the casing (31) near this compression mechanism (50), the surface temperature of the expansion mechanism (60) and the temperature of this expansion mechanism (60) casing (31) The compression mechanism (50) or expansion mechanism (60) side with a large temperature difference is fixed to the casing (31) with the mounting plate (101). Thus, it is possible to prevent the compression mechanism (50) or the expansion mechanism (60) and the casing (31) having a large temperature difference from the casing (31) from being fixed directly as in the prior art. For this reason, by making the mounting plate (101) have a high thermal resistance, heat exchange between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is achieved. Decrease.

[0013] In a second aspect based on the first aspect, the casing (31) has a cylindrical container shape, the mounting plate (101) is formed in an annular shape, and the compressor on the inner peripheral side. A mechanism side mounting portion (104) for fixing the structure (50) or the expansion mechanism (60), and a casing side mounting portion (105) fixed to the casing (31) on the outer peripheral side. The part (105) protrudes radially outward, and a predetermined plate outer peripheral gap (108) is formed between the casing side mounting part (105) and the inner surface of the casing (31). The part (104) and the casing side attachment part (105) are arranged shifted in the circumferential direction!

[0014] According to the above configuration, the joint (67) between the mounting plate (101) and the casing (31) is limited to the casing side mounting portion (105) by providing the plate outer peripheral gap (108). As a result, the heat transfer area is smaller than when the casing (31) is joined all around. Also, by disposing the mechanism-side mounting portion (104) and the casing-side mounting portion (105) in the circumferential direction, the heat transfer path can be reduced compared to when both mounting portions are provided at the same position in the circumferential direction. The ability to lengthen S. For this reason, the thermal resistance is increased, and heat exchange between the compression mechanism (50) or the expansion mechanism (60) and the casing (31) is reduced. For this reason, heat exchange due to heat conduction between the low temperature refrigerant inside the expansion mechanism (60) and the high temperature refrigerant inside the compression mechanism (50) is reduced.

[0015] In a third aspect based on the second aspect, the refrigerant is directly introduced into the compressor mechanism (50) from the refrigerant circuit (20), and the refrigerant compressed by the compression mechanism (50) is compressed into the casing ( 31) It is configured to be discharged into the inner space (49) in the inner space (49) and to flow out of the casing (31) from the inner space (49), and the expansion mechanism (60) is interposed via the mounting plate (101). It is fixed to the casing (31).

[0016] According to the above configuration, the casing (31) is a so-called high-pressure dome type fluid machine in which high temperature and high pressure are maintained. In this case, the low temperature expansion mechanism (60), which has a significant temperature difference from the atmosphere in the casing (31), is fixed to the casing (31) via the mounting plate (101), so that the mounting plate (101) The heat transfer reduction effect of the Heat input due to heat conduction from the sink (31) to the low temperature expansion mechanism (60) is reduced.

[0017] In a fourth aspect based on the second aspect, the refrigerant is directly introduced from the refrigerant circuit (20) into the compressor structure (50), and the compressed refrigerant is directly discharged out of the casing (31). The compression mechanism (50) is fixed to the casing (31) via the mounting plate (101).

[0018] According to the above configuration, the casing (31) is a so-called low-pressure dome type fluid machine that is maintained at a low temperature and a low pressure. In this case, the temperature difference with the atmosphere in the casing (31) is severe, and the high-temperature compression mechanism (50) is fixed to the low-temperature casing (31) via the mounting plate (101). The heat transfer reduction effect of 101) reduces heat input due to heat conduction from the high-temperature compression mechanism (50) to the low-temperature casing (31).

[0019] In a fifth aspect based on the third aspect, the mechanism-side mounting portion (104) is provided with the expansion mechanism.

The surface temperature is higher than the periphery of (60)! /, And the portion is arranged to connect the portion having a lower surface temperature than the periphery of the casing (31) in the vicinity of the expansion mechanism (60)! / RU

[0020] According to the above configuration, the mechanism-side mounting portion (104) at one end of the heat transfer path in the mounting plate (101) has the surface temperature of the expansion mechanism (60) and the case near the expansion mechanism (60). Since it is arranged so that the difference between the surface temperature and the single singe (31) is small, the temperature difference between the mechanism side mounting part (104) and the casing side mounting part (105) is reduced, and Heat input from the casing (31) side to the low temperature expansion mechanism (60) side is reduced. For this reason, heat exchange by heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced.

[0021] A sixth invention is the third invention, wherein the casing-side mounting portion (105) has a surface temperature higher than that of the periphery of the expansion mechanism (60), the portion and the expansion mechanism (60 ) The surface temperature is lower than that of the vicinity of the casing (31) in the vicinity.

[0022] According to the above configuration, the casing side mounting portion (105) at one end of the heat transfer path in the mounting plate (101) has the surface temperature of the expansion mechanism (60) and the casing in the vicinity of the expansion mechanism (60). (31), the temperature difference between the mechanism side mounting part (104) and the casing side mounting part (105) is reduced, so that the difference between the surface temperature and the surface temperature is small. Low heat input from the (31) side to the low temperature expansion mechanism (60) side. Because of this, expansion Heat exchange due to heat conduction between the low-temperature refrigerant in the mechanism (60) and the high-temperature refrigerant in the compression mechanism (50) is reduced.

[0023] A seventh invention is the invention according to any one of the second to sixth inventions, wherein the mounting plate (101) is provided between the mechanism side mounting portion (104) and the casing side mounting portion (105). The circumferential sectional area of the casing is smaller than the circumferential sectional area of the casing-side mounting portion (105).

[0024] According to the above configuration, since the heat transfer area of the heat transfer path of the mounting plate (101) is reduced, the heat between the compression mechanism (50) or the expansion mechanism (60) and the casing (31) is reduced. Exchange is reduced. For this reason, heat exchange due to heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced.

[0025] In an eighth invention according to any one of the second to seventh inventions, the mounting plate (101) has a sheet metal structure.

[0026] According to the above configuration, since the mounting plate (101) is a sheet metal structure formed of a thin plate, the heat transfer area of the heat transfer path is reduced, so that the compression mechanism (50) or the expansion mechanism (60) And heat exchange between the casing and the casing (31) is reduced. For this reason, heat exchange by heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced.

[0027] In a ninth aspect based on any one of the second to eighth aspects, the mounting plate (101) includes a plurality of through holes (106, 107).

[0028] According to the above configuration, since the heat transfer area of the heat transfer path is reduced by forming the through holes (106, 107) in the mounting plate (101), the compression mechanism (50) or the expansion mechanism ( 60) and heat exchange between the casing (31) is reduced. For this reason, heat exchange by heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced.

[0029] A tenth invention is the invention according to any one of the second to ninth inventions, provided in the internal space of the casing (31), and the casing in the compression mechanism (50) or the expansion mechanism (60). A heat insulating material (90, 96) is provided which covers the entire exposed surface in the shing (31) and through which the rotating shaft (40) passes. [0030] According to the above configuration, since the heat insulating material (90, 96) covers the entire exposed surface in the casing (31) of the compression mechanism (50) or the expansion mechanism (60), the casing (31 ) And the heat exchange between the compression mechanism (50) or the expansion mechanism (60) covered with the heat insulating material (90, 96) is prevented. For this reason, heat exchange between the compression mechanism (50) or the expansion mechanism (60) and the casing (31) is further reduced. For this reason, heat exchange due to heat conduction between the low-temperature refrigerant in the expansion mechanism (60) and the high-temperature refrigerant in the compression mechanism (50) is reduced.

[0031] In an eleventh aspect based on the tenth aspect, the heat insulating material (90, 96) is a first heat insulating material in the axial direction of the rotating shaft (40) with the mounting plate (101) as a boundary. (90) and second insulation (96).

[0032] According to the above configuration, the compression mechanism (50) or the expansion mechanism (60) causes the heat insulation (90, 96) fixed to the casing (31) by the mounting plate (101) to be the first heat insulation. By dividing into the material (90) and the second heat insulating material (96), the heat insulating material (90, 96) can be easily assembled.

[0033] In a twelfth invention according to the tenth or eleventh invention, the heat insulating material (90, 96) is also provided in the plate outer peripheral gap (108).

[0034] According to the above configuration, since the mounting plate (101) is also covered with the heat insulating material (90, 96), heat exchange between the refrigerant and the mounting plate (101) is prevented. Heat exchange between the mechanism (50) or expansion mechanism (60) and the casing (31) is reduced. For this reason, heat exchange due to heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced.

[0035] In a thirteenth aspect of the present invention, any one of the second to twelfth forces described above, the mechanism side mounting portion (104) and the mechanism side of the compression mechanism (50) or the expansion mechanism (60) in one aspect At least one of the attachment part (104) and the joint part (67) to be joined is formed in a protruding shape in order to reduce the contact area.

[0036] According to the above configuration, the mounting plate (101) and the compression mechanism (50) or the expansion mechanism (60) are compared to the case where the mechanism-side mounting portion (104) and the joint portion (67) are joined over the entire surface. Since the heat transfer area of the heat transfer path between the compression mechanism (50) and the expansion mechanism (60) and the casing (31) is reduced. For this reason, heat exchange by heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced. [0037] According to a fourteenth aspect of the present invention, in any one of the second to thirteenth aspects, in the first aspect, the mechanism side mounting portion (104) and the mechanism side of the compression mechanism (50) or the expansion mechanism (60). A heat insulating spacer (110) made of a heat insulating material is disposed between the attachment portion (104) and the joint portion (67) to be joined.

[0038] According to the above configuration, the mounting plate (101) is provided by disposing a small heat transfer coefficient and a heat insulating spacer (110) between the mechanism side mounting portion (104) and the joint portion (67). ) And the compression mechanism (50) or the expansion mechanism (60), the heat resistance between the compression mechanism (50) or the expansion mechanism (60) and the casing (31) is increased. Reduced. For this reason, heat exchange due to heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced.

[0039] According to a fifteenth aspect, in any one of the second to fourteenth aspects, in one aspect, the refrigerant circuit (20) performs a supercritical refrigeration cycle using carbon dioxide as a refrigerant.

[0040] According to the above configuration, carbon dioxide as a refrigerant circulates in the refrigerant circuit (20) to which the fluid machine (30) is connected. The compression mechanism (50) of the fluid machine (30) compresses and discharges the sucked refrigerant to a level equal to or higher than the critical pressure. On the other hand, the expansion mechanism (60) of the fluid machine (30) is expanded by introducing a high-pressure refrigerant equal to or higher than the critical pressure.

The invention's effect

[0041] As described above, according to the present invention, the compressor plate (50) having a large temperature difference from the casing (31) or the expansion mechanism (60) and the mounting plate that does not directly fix the casing (31). (101) and the compression mechanism (50) or the expansion mechanism (60) and the expansion mechanism (60) are reduced by reducing the heat exchange between the compression mechanism (50) or the expansion mechanism (60) and the casing (31). However, in a fluid machine housed in a single casing, the force S can be used to prevent a decrease in capacity and power recovery effect.

[0042] According to the second aspect of the present invention, the predetermined plate outer peripheral gap (108) is formed between the casing side mounting portion (105) protruding from the mounting plate (101) and the casing (31), The joint area between the mounting plate (101) and the casing (31) is reduced to reduce the heat transfer area, and the mechanism side mounting part (104) of the annular mounting plate (101) and the casing side mounting part (105) is shifted in the circumferential direction to lengthen the heat transfer path. By increasing the thermal resistance, it is possible to prevent further decline in capacity and power recovery effect.

[0043] According to the third invention, in the high-pressure dome type fluid machine, the temperature difference from the atmosphere in the casing (31) is severe, and the low-temperature expansion mechanism (60) is interposed via the mounting plate (101). The heat exchange by heat conduction between the hot casing (31) and the low temperature expansion mechanism (60) is reduced by fixing to the casing (31). Can be prevented.

[0044] According to the fourth aspect of the present invention, in the low-pressure dome type fluid machine, the temperature difference from the atmosphere in the casing (31) is severe, and the high-temperature compression mechanism (50) is interposed via the mounting plate (101). The heat exchange due to heat conduction between the low-temperature casing (31) and the high-temperature expansion mechanism (60) fixed to the low-temperature casing (31) is further reduced. A decrease in the effect can be prevented.

[0045] According to the fifth invention, the mechanism-side mounting portion (104) is arranged so as to reduce the difference between the surface temperature of the expansion mechanism (60) and the surface temperature of the casing (31) in the vicinity thereof. By reducing the heat input from the high temperature side to the low temperature side, the power S can be used to prevent further decline in capacity and power recovery effect.

[0046] According to the sixth aspect of the present invention, the casing side mounting portion (105) is arranged so as to reduce the difference between the surface temperature of the expansion mechanism (60) and the surface temperature of the casing (31) in the vicinity thereof. By reducing the heat input from the high temperature side to the low temperature side, it is possible to prevent further reduction in capacity and power recovery effect.

[0047] According to the seventh invention, the heat transfer area of the heat transfer path is reduced by reducing the circumferential cross-sectional area of the mounting plate (101) to reduce the compression mechanism (50) or the expansion mechanism (60). By reducing the heat exchange with the casing (31), it is possible to prevent further reduction in capacity and power recovery effect.

[0048] According to the eighth aspect of the invention, the mounting plate (101) is a sheet metal structure constituted by a thin plate, and the heat transfer area of the heat transfer path is reduced, so that the compression mechanism (50) or the expansion mechanism (60) is connected to the casing. By reducing the heat exchange with the ring (31), it is possible to prevent further reduction in capacity and power recovery effect. [0049] According to the ninth aspect of the present invention, a plurality of through holes (106, 107) are provided in the mounting plate (101) to reduce the heat transfer area of the heat transfer path, and the compression mechanism (50) or the expansion mechanism ( By reducing the heat exchange between 60) and the casing (31), it is possible to prevent further reduction in capacity and power recovery effect.

[0050] According to the tenth aspect of the present invention, since the entire exposed surface in the casing (31) of the compression mechanism (50) or the expansion mechanism (60) is covered with the heat insulating material (90, 96), the casing (31) Prevents heat exchange between the internal space of the compressor and the compression mechanism (50) or expansion mechanism (60) covered with heat insulation material (90, 96)! Can be prevented.

[0051] According to the eleventh aspect of the present invention, the heat insulating material (90, 96) is divided in the axial direction of the rotating shaft (40) with the mounting plate (101) as a boundary, so that the set of heat insulating materials (90, 96) is obtained. It is easy to attach, and the manufacturing cost can be reduced.

[0052] According to the twelfth aspect of the present invention, the plate outer circumferential gap (108) is also provided with the heat insulating material (90, 96) to prevent heat exchange with the refrigerant, and the compression mechanism (50) or the expansion mechanism ( By reducing the heat exchange between 60) and the casing (31), it is possible to prevent further reduction in capacity and power recovery effect.

[0053] According to the thirteenth aspect of the invention, at least one of the mechanism-side attachment portion (104) and the joint portion (67) of the compression mechanism (50) or the expansion mechanism (60) is projected to increase the contact area. By reducing the size and reducing the heat exchange between the compression mechanism (50) or expansion mechanism (60) and the casing (31), it is possible to prevent further reduction in capacity and power recovery effect. it can.

[0054] According to the fourteenth aspect of the invention, the heat insulating spacer made of a heat insulating material is provided between the mechanism side mounting portion (104) and the joint portion (67) of the compression mechanism (50) or the expansion mechanism (60). (110) is arranged to increase the thermal resistance between the mounting plate (101) and the compression mechanism (50) or the expansion mechanism (60), so that the compression mechanism (50) or the expansion mechanism (60) and the casing (31 ), It is possible to prevent further reduction in capacity and power recovery effect.

Brief Description of Drawings

FIG. 1 is a piping system diagram showing a configuration of a refrigerant circuit according to a first embodiment.

FIG. 2 is a longitudinal sectional view showing a schematic configuration of a compression / expansion unit according to Embodiment 1.

FIG. 3 is a longitudinal sectional view showing an expansion mechanism and a heat insulating material according to Embodiment 1. 4 is a cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a cross-sectional view of the V-V spring in FIG.

FIG. 6 is a cross-sectional view taken along line VI—VI in FIG.

FIG. 7] is an enlarged view showing the main part of the expansion mechanism of the first embodiment.

FIG. 8] A schematic cross-sectional view of the expansion mechanism showing the state of the expansion mechanism of Embodiment 1 for each rotation angle of the shaft of 90 °.

9] FIG. 4 is a diagram corresponding to FIG. 4 according to Modification 1 of Embodiment 1.

FIG. 10 is a cross-sectional view taken along the line XX of FIG.

11] A perspective view showing the temperature distribution on the inner surface of the casing.

12] FIG. 4 is a diagram corresponding to FIG. 4 according to Modification 2 of Embodiment 1.

13] FIG. 6 is a diagram corresponding to FIG. 6 according to Modification 3 of Embodiment 1.

Explanation of symbols

20 Refrigerant circuit

30 Compression / Expansion unit

31 Casing

40 axis of rotation

49 2nd space (internal space)

50 Compression mechanism

60 Expansion mechanism

90 First insulation

96 Second insulation

101 mounting play

104 Mechanism side mounting

105 Casing side mounting

106, 107 Through hole

108 Plate outer peripheral clearance

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. This embodiment is a book An air conditioner including a compression / expansion unit that is a fluid machine according to the invention.

[0058] <Overall configuration of air conditioner>

As shown in FIG. 1, the air conditioner (10) of the present embodiment includes a refrigerant circuit (20). The refrigerant circuit (20) includes a compression / expansion unit (30), an outdoor heat exchanger (23), an indoor heat exchanger (24), a first four-way selector valve (21), and a second A four-way selector valve (22) is connected. The refrigerant circuit (20) is filled with carbon dioxide (CO 2) as a refrigerant.

2

[0059] The compression / expansion unit (30) includes a casing (31) formed in a vertically long cylindrical sealed container shape. The casing (31) houses a compression mechanism (50), an expansion mechanism (60), and an electric motor (45). In the casing (31), the compression mechanism (50), the electric motor (45), and the expansion mechanism (60) are arranged in order from the bottom to the top. Details of the compression / expansion unit (30) will be described later.

[0060] In the refrigerant circuit (20), the compression mechanism (50) has its discharge side (discharge pipe (37)) connected to the first port of the first four-way switching valve (21). The suction side (suction pipe (36)) is connected to the fourth port of the first four-way selector valve (21). On the other hand, the expansion mechanism (60) has its outflow side (outflow pipe (39)) connected to the first port of the second four-way switching valve (22) and its inflow side (inflow pipe (38)) connected to the second 4th switching valve (22). Each is connected to the fourth port of the path switching valve (22).

[0061] In the refrigerant circuit (20), the outdoor heat exchanger (23) has one end connected to the second port of the second four-way switching valve (22) and the other end connected to the first four-way switching valve. Each is connected to the third port of (21). On the other hand, the indoor heat exchanger (24) has one end connected to the second port of the first four-way selector valve (21) and the other end connected to the third port of the second four-way selector valve (22). It is connected.

[0062] The first four-way switching valve (21) and the second four-way switching valve (22) are connected to the first port and the second port, respectively, and the third port and the fourth port, respectively. Are connected to each other (shown by a solid line in FIG. 1), the first port is connected to the third port, and the second port is connected to the fourth port (shown by a broken line in FIG. 1). To the state shown in FIG.

As shown in FIG. 2, the compression / expansion unit (30) includes a casing (31) which is a vertically long and cylindrical sealed container. Inside this casing (31), from bottom to top In addition, a compression mechanism (50), an electric motor (45), and an expansion mechanism (60) are arranged. In addition, refrigeration oil, which is lubricating oil, is stored at the bottom of the casing (31). In other words, refrigeration oil is stored near the compression mechanism (50) inside the casing (31)!

[0064] The internal space of the casing (31) is partitioned vertically by a first heat insulating material (90), which will be described later, provided below the front head (61) of the expansion mechanism (60), and the upper space is the first space. The space (48) and the lower space constitute the second space (49), respectively. An expansion mechanism (60) is disposed in the first space (48), and a compression mechanism (50) and an electric motor (45) are disposed in the second space (49).

[0065] A discharge pipe (37) is attached to the casing (31). The discharge pipe (37) is disposed between the electric motor (45) and the expansion mechanism (60), and communicates with the second space (49) in the casing (31). Further, the discharge pipe (37) is formed in a comparatively short straight tube and is installed in a substantially horizontal posture.

[0066] The electric motor (45) is arranged at the center of the casing (31) in the longitudinal direction. The electric motor (45) includes a stator (46) and a rotor (47). The stator (46) is fixed to the casing (31) by shrink fitting or the like. The rotor (47) is disposed inside the stator (46). The main shaft portion (44) of the rotating shaft (40) passes through the rotor (47) coaxially with the rotor (47).

[0067] The rotating shaft (40) constitutes a rotating shaft. In the rotary shaft (40), two lower eccentric portions (58, 59) are formed on the lower end side, and two large diameter eccentric portions (41, 42) are formed on the upper end side. The rotating shaft (40) has a lower end portion formed with the lower eccentric portion (58, 59) at the compressor mechanism (50) and an upper end portion formed with the large diameter eccentric portion (41, 42) at the expansion mechanism ( 60) are engaged.

[0068] The two lower eccentric portions (58, 59) are formed to have a larger diameter than the main shaft portion (44), the lower one being the first lower eccentric portion (58) and the upper one being the first. 2 Configure the lower eccentric part (59). In the first lower eccentric portion (58) and the second lower eccentric portion (59), the eccentric directions of the main shaft portion (44) with respect to the axial center are reversed.

[0069] The two large-diameter eccentric parts (41, 42) are formed with a larger diameter than the main shaft part (44), and the lower one constitutes the first large-diameter eccentric part (41) and the upper one Constitutes the second large-diameter eccentric part (42)! The first large-diameter eccentric part (41) and the second large-diameter eccentric part (42) are both eccentric in the same direction. First 2 The outer diameter of the large-diameter eccentric part (42) is larger than the outer diameter of the first large-diameter eccentric part (41). Also, the amount of eccentricity of the main shaft portion (44) with respect to the shaft center is such that the second large diameter eccentric portion (42) is larger than the first large diameter eccentric portion (41)!

[0070] Although not shown, an oil supply passage is formed in the rotating shaft (40). The oil supply passage extends along the rotating shaft (40), and its starting end opens at the lower end of the rotating shaft (40) and its terminal end opens above the rotating shaft (40). Refrigerating machine oil is supplied to the compression mechanism (50) and the expansion mechanism (60) from this oil supply passage. However, the refrigerating machine oil supplied to the expansion mechanism (60) is minimized, and the refrigerating machine oil lubricated with the expansion mechanism (60) does not flow out into the first space (48) but flows into the outflow pipe ( 39) Power is discharged.

[0071] The compression mechanism (50) constitutes a so-called oscillating piston type rotary compressor. The compression mechanism (50) includes two cylinders (51, 52) and two pistons (57). In the compressor mechanism (50), the rear head (55), the first cylinder (51), the intermediate plate (56), the second cylinder (52), the front head ( 54) are stacked.

[0072] One cylindrical piston (57) is disposed inside each of the first and second cylinders (51, 52). Although not shown, a flat blade is projected on the side surface of the piston (57), and this blade is supported by the cylinders (51, 52) via a swing bush. The piston (57) in the first cylinder (51) engages with the first lower eccentric part (58) of the rotating shaft (40). On the other hand, the piston (57) in the second cylinder (52) engages with the second lower eccentric portion (59) of the rotating shaft (40). Each piston (57, 57) has its inner peripheral surface in sliding contact with the outer peripheral surface of the lower eccentric portion (58, 59), and its outer peripheral surface is in sliding contact with the inner peripheral surface of the cylinder (51, 52). A compression chamber (53) is formed between the outer peripheral surface of the piston (57, 57) and the inner peripheral surface of the cylinder (51, 52).

[0073] One suction port (32) is formed in each of the first and second cylinders (51, 52). Each suction port (32) penetrates the cylinder (51, 52) in the radial direction, and the end thereof opens to the inner peripheral surface of the cylinder (51, 52). Each suction port (32) is extended outside the casing (31) by a suction pipe (36).

[0074] One discharge port is formed in each of the front head (54) and the rear head (55). The discharge port of the front head (54) connects the compression chamber (53) in the second cylinder (52). Communicate with the second space (49). The discharge port of the rear head (55) allows the compression chamber (53) in the first cylinder (51) to communicate with the second space (49). Each discharge port is provided with a discharge valve serving as a reed valve at its end, and is opened and closed by this discharge valve. In FIG. 2, the discharge port and the discharge valve are not shown. The gas refrigerant discharged from the compression mechanism (50) into the second space (49) is sent out from the compression / expansion unit (30) through the discharge pipe (37).

As shown in an enlarged view in FIG. 3, the expansion mechanism (60) is a so-called oscillating piston type rotary expander. The expansion mechanism (60) is provided with two pairs of cylinders (71, 81) and pistons (75, 85) which are paired. The expansion mechanism (60) includes a front head (61), an intermediate plate (63), and a rear head (62).

[0076] In the expansion mechanism (60), the front head (61), the first cylinder (71), the intermediate plate (63), the second cylinder (81), and the rear head (62) are stacked in this order from bottom to top. It is in the state that was done. In this state, the first cylinder (71) has its lower end face closed by the front head (61) and its upper end face closed by the intermediate plate (63). On the other hand, the second cylinder (81) has its lower end face closed by the intermediate plate (63) and its upper end face closed by the rear head (62). In addition, the inner diameter of the second cylinder (81) is larger than the inner diameter of the first cylinder (71).

[0077] The expansion mechanism (60) is fixed to the inner surface of the casing (31) via the mounting plate (101). As shown in FIGS. 4 and 5, the mounting plate (101) is made of a ring-shaped sheet metal structure, and is formed on the lower side of the entire circumference from the disk-shaped plate body (102) and the plate body (102). And a bent portion (103) bent approximately 90 degrees. The mounting plate (101) has a mechanism side mounting portion (104) fixed to the expansion mechanism (60) on the inner peripheral side, and a casing side mounting portion (105) fixed to the casing (31) on the outer peripheral side. Have

[0078] The joint portion (67) to be joined to the mechanism-side mounting portion (104) in the front head (61) of the expansion mechanism (60) is provided to protrude outward from the outer periphery of the front head (61). In this embodiment, the joint portions (67) are formed at intervals of 120 ° equally in the circumferential direction at three locations. As shown in FIG. 6, a bolt fastening hole (68) is formed at the center of the joint (67). ing. The periphery of the bolt fastening hole (68) is formed to protrude upward. Similarly, a bolt fastening hole (104a) is formed at the center of the mechanism side mounting portion (104). The periphery of the bolt fastening hole (104a) is formed so as to protrude downward. This reduces the contact area between the mechanism side mounting portion (104) and the joint portion (67).

[0079] The casing side mounting portion (105) is formed so as to protrude radially outward from the outer periphery of the mounting plate (101). In the present embodiment, the three portions are equally spaced 120 ° apart in the circumferential direction. The casing side mounting portion (105) is welded to the inner surface of the casing (31). A predetermined plate outer peripheral gap (108) is formed between each casing side mounting portion (105) and the casing (31).

[0080] The mounting plate (101) includes a mechanism side mounting portion (104) and a casing side mounting portion.

The cross-sectional area in the circumferential direction with respect to (105) is smaller than the cross-sectional area in the circumferential direction of the casing side mounting portion (105). The mounting plate (101) includes a plurality of through holes (106, 107) for reducing the cross-sectional area in the circumferential direction.

As shown in FIG. 4, the mechanism side mounting portion (104) and the casing side mounting portion (105) are arranged so as to be shifted in the circumferential direction. That is, in the present embodiment, the casing side mounting portion (105) is disposed at the center position in the circumferential direction of the two mechanism side mounting portions (104).

The rotary shaft (40) passes through the stacked front head (61), first cylinder (71), intermediate plate (63), and second cylinder (81). A central hole penetrating the rear head (62) in the thickness direction is formed at the center of the rear head (62). The upper end of the rotating shaft (40) is inserted into the central hole of the rear head (62). The rotary shaft (40) has its first large-diameter eccentric part (41) located in the first cylinder (71) and its second large-diameter eccentric part (42) in the second cylinder (81). positioned.

[0083] As shown in Figs. 7 and 8, the first piston (75) is provided in the first cylinder (71), and the second piston (85) is provided in the second cylinder (81). ing. The first and second pistons (75, 85) are both formed in an annular shape or a cylindrical shape. The outer diameter of the first piston (75) and the outer diameter of the second piston (85) are equal to each other. The inner diameter of the first piston (75) is approximately equal to the outer diameter of the first large-diameter eccentric part (41), and the inner diameter of the second piston (85) is approximately equal to the outer diameter of the second large-diameter eccentric part (42). Yes. The first piston (75) has a first large diameter eccentric part (4 1) The second large diameter eccentric part (42) penetrates the force S and the second piston (85).

[0084] The first piston (75) has an outer peripheral surface on the inner peripheral surface of the first cylinder (71), one end surface force S on the front head (61), and the other end surface on the intermediate plate (63). Each is in sliding contact. A first expansion chamber (72) is formed in the first cylinder (71) between the inner peripheral surface thereof and the outer peripheral surface of the first piston (75). On the other hand, the second piston (85) has an outer peripheral surface on the inner peripheral surface of the second cylinder (81), one end surface on the rear head (62), and the other end surface on the intermediate plate (63). It is in sliding contact. A second expansion chamber (82) is formed in the second cylinder (81) between its inner peripheral surface and the outer peripheral surface of the second piston (85).

Each of the first and second pistons (75, 85) is integrally provided with one blade (76, 86). The blades (76, 86) are formed in a plate shape extending in the radial direction of the piston (75, 85), and project outward from the outer peripheral surface of the piston (75, 85). 1st piston (7

The blade (76) of 5) is inserted into the bush hole (78) of the first cylinder (71), and the blade (86) of the second piston (85) is inserted into the bush hole (88) of the second cylinder (81). Entered! The bush holes (78, 88) of the cylinders (71, 81) penetrate the cylinders (71, 81) in the thickness direction, and open to the inner peripheral surface of the cylinders (71, 81). These bush holes (78, 88) constitute through holes (10 6, 107).

[0086] Each cylinder (71, 81) is provided with a pair of force pairs of bushes (77, 87). Each bush (77, 87) is a small piece formed such that the inner surface is a flat surface and the outer surface is a circular arc surface. In each cylinder (71, 81), the pair of bushes (77, 87) are inserted into the bush holes (78, 88) and sandwich the blades (76, 86). Each bush (77, 87) has its inner surface sliding with the blade (76, 86) and its outer surface with the cylinder (71, 81). The blades (76, 86) integral with the piston (75, 85) are supported by the cylinders (71, 81) via the bushes (77, 87), and rotate with respect to the cylinders (71, 81). It is free to move forward and backward.

[0087] The first expansion chamber (72) in the first cylinder (71) has a first blade (7) integrated with the first piston (75).

6) The left side of the first blade (76) in FIGS. 7 and 8 is the first high pressure chamber (73) on the high pressure side, and the right side is the first low pressure chamber (74) on the low pressure side. . The second expansion chamber (82) in the second cylinder (81) is partitioned by a second blade (86) integral with the second piston (85). 7 and 8, the left side of the second blade (86) is the high pressure side second high pressure chamber (83), and the right side is the low pressure side second low pressure chamber (84).

[0088] The first cylinder (71) and the second cylinder (81) are arranged in a posture in which the positions of the bushes (77, 87) in the respective circumferential directions coincide. In other words, the arrangement angle of the second cylinder (81) with respect to the first cylinder (71) is 0 °. As described above, the first large-diameter eccentric part (41) and the second large-diameter eccentric part (42) are eccentric in the same direction with respect to the axis of the main shaft part (44). Therefore, at the same time as the first blade (76) is most retracted to the outside of the first cylinder (71), the second blade (86) is most retracted to the outside of the second cylinder (81). Become.

The first cylinder (71) has an inflow port (34). The inflow port (34) opens at a position slightly on the left side of the bush (77) in FIGS. 7 and 8 on the inner peripheral surface of the first cylinder (71). The inflow port (34) can communicate with the first high pressure chamber (73). On the other hand, the second cylinder (81) is formed with an outflow port (35). The outflow port (35) opens at a position slightly on the right side of the bush (87) in FIGS. 7 and 8 on the inner peripheral surface of the second cylinder (81). Outflow port (35) can communicate with second low pressure chamber (84)

In the intermediate plate (63), communication passages (93) and (64) are formed. The communication passages (93) and (64) penetrate the intermediate plate (63) in the thickness direction. On the surface on the first cylinder (71) side of the intermediate plate (63), one end of the communication passages (93) and (64) is opened at the right side of the first blade (76). On the surface on the second cylinder (81) side of the intermediate plate (63), the other end of the communication passages (93) (64) is opened at the left side of the second blade (86). As shown in FIG. 7, the communication passages (93) (64) extend obliquely with respect to the thickness direction of the intermediate plate (63), and the first low pressure chamber (74) and the second high pressure chamber (83) And communicate with each other!

In the expansion mechanism (60) of the present embodiment configured as described above, the first cylinder (71), the bush (77) provided there, the first piston (75), and the first The blade (76) constitutes the first rotary mechanism (70). The second cylinder (81), the bush (87) provided there, the second piston (85), and the second blade (86) constitute the second rotary mechanism (80). . [0092] As shown in FIG. 3, the inner space of the casing (31) covers the entire exposed surface in the casing (31) of the expansion mechanism (60), and the heat insulating material through which the rotating shaft (40) passes. (90, 96). The heat insulating material (90, 96) is divided into the first heat insulating material (90) and the second heat insulating material (96) in the axial direction of the rotating shaft (40) with the mounting plate (101) as a boundary! .

[0093] The first heat insulating material (90) on the lower side extends from the periphery of the rotary shaft (40) to the inner peripheral surface of the casing (31) so as to contact the compression mechanism (50) side of the expansion mechanism (60). It is provided to cover up to. As a result, the first space (48) on the low-temperature expansion mechanism (60) side, where the temperature difference from the atmosphere in the casing (31) is significant, is changed from the second space (49) by the first heat insulating material (90). It is delimited.

[0094] Specifically, the first heat insulating material (90) is a disk-shaped member having a central hole through which the rotation shaft (40) passes, and the front head ( It is provided so as to contact the lower surface of 61). A minimum gap is formed between the outer peripheral surface of the rotating shaft (40) and the inner peripheral surface of the first heat insulating material (90) so as not to hinder the rotation of the rotating shaft (40).

Further, as shown in FIG. 3, the upper second heat insulating material (96) has a substantially cylindrical shape having a top plate, and is provided in the casing (31) on the side surface and the upper surface of the expansion mechanism (60). Covers the entire exposed surface. That is, the inflow pipe (38) and the outflow pipe (39) pass through the second heat insulating material (96). In addition, cover the outer periphery of the inflow pipe (38) and outflow pipe (39).

Further, as shown in FIG. 4, the heat insulating material (90, 96) is also provided in the plate outer peripheral gap (108) between the casing side mounting portion (105) and the casing (31). It has been. Specifically, the side surface of the mounting plate (101) is covered with a portion protruding from the lower surface of the second heat insulating material (96). Cover the side surface of the mounting plate (101) with the part protruding from the top surface of the first insulation (90).

[0097] Further, the first and second heat insulating materials (90, 96) are made of resin molded products! Specific materials may be special engineering plastics with high heat resistance (240-250 ° C). For example, PPS (polyphenylene sulfide), PEEK (polyetherketone), PI (polyamide) and the like.

[0098] Driving operation

The operation of the air conditioner (10) will be described. Here, air-conditioner (10) during cooling operation The operation during the heating operation will be described, followed by the operation of the expansion mechanism (60).

[0099] <Cooling operation>

During the cooling operation, the first four-way switching valve (21) and the second four-way switching valve (22) are switched to the state shown by the broken line in FIG. In this state, when the motor (45) of the compression / expansion unit (30) is energized, the refrigerant circulates in the refrigerant circuit (20), and a vapor compression refrigeration cycle is performed.

[0100] The refrigerant compressed by the compression mechanism (50) is discharged from the compression / expansion unit (30) through the discharge pipe (37). In this state, the refrigerant pressure is higher than its critical pressure. This discharged refrigerant is sent to the outdoor heat exchanger (23) to radiate heat to the outdoor air. The high-pressure refrigerant radiated by the outdoor heat exchanger (23) flows into the expansion mechanism (60) through the inflow pipe (38). In the expansion mechanism (60), the high-pressure refrigerant expands, and power is recovered from the high-pressure refrigerant. The low-pressure refrigerant after expansion is sent to the indoor heat exchanger (24) through the outflow pipe (39). In the indoor heat exchanger (24), the refrigerant that has flowed in absorbs heat from the room air and evaporates, thereby cooling the room air. The low-pressure gas refrigerant discharged from the indoor heat exchanger (24) passes through the suction pipe (36) and is sucked into the compression mechanism (50) from the suction port (32). The compression mechanism (50) compresses and discharges the sucked refrigerant.

[0101] <Heating operation>

During the heating operation, the first four-way selector valve (21) and the second four-way selector valve (22) are switched to the state shown by the solid line in FIG. In this state, when the motor (45) of the compression / expansion unit (30) is energized, the refrigerant circulates in the refrigerant circuit (20), and a vapor compression refrigeration cycle is performed.

[0102] The refrigerant compressed by the compression mechanism (50) is discharged from the compression / expansion unit (30) through the discharge pipe (37). In this state, the refrigerant pressure is higher than its critical pressure. This discharged refrigerant is sent to the indoor heat exchanger (24). In the indoor heat exchanger (24), the refrigerant flowing in dissipates heat to the room air, and the room air is heated. The refrigerant that has dissipated heat in the indoor heat exchanger (24) flows into the expansion mechanism (60) through the inflow pipe (38). In the expansion mechanism (60), the high-pressure refrigerant expands and the high-pressure refrigerant power is recovered. The expanded low-pressure refrigerant is sent to the outdoor heat exchanger (23) through the outflow pipe (39), absorbs heat from the outdoor air, and evaporates. The low-pressure gas refrigerant discharged from the outdoor heat exchanger (23) is sucked into the compression mechanism (50) from the suction port (32) through the suction pipe (36). The compression mechanism (50) compresses and discharges the sucked refrigerant. <Operation of expansion mechanism>

The operation of the expansion mechanism (60) will be described with reference to FIG.

[0104] First, the process by which supercritical high-pressure refrigerant flows into the first high-pressure chamber (73) of the first rotary mechanism (70) will be described. When the rotation shaft (40) slightly rotates from the state where the rotation angle is 0 °, the contact position of the first piston (75) and the first cylinder (71) passes through the opening of the inflow port (34), and the inflow port High pressure refrigerant begins to flow from (34) into the first high pressure chamber (73). Thereafter, as the rotation angle of the rotating shaft (40) gradually increases to 90 °, 180 °, and 270 °, high-pressure refrigerant flows into the first high-pressure chamber (73). The inflow of high-pressure refrigerant into the first high-pressure chamber (73) continues until the rotation angle of the rotating shaft (40) reaches 360 °.

Next, a process for expanding the refrigerant in the expansion mechanism (60) will be described. When the rotation shaft (40) is slightly rotated from the state where the rotation angle is 0 °, the first low pressure chamber (74) and the second high pressure chamber (83) communicate with each other via the communication passages (93) and (64). The refrigerant begins to flow from the first low pressure chamber (74) to the second high pressure chamber (83). After that, as the rotation angle of the rotating shaft (40) gradually increases to 90 °, 180 °, 270 °, the volume of the first low pressure chamber (74) gradually decreases and the volume of the second high pressure chamber (83) decreases. The volume gradually increases, and as a result, the volume of the expansion chamber (66) gradually increases. This increase in volume of the expansion chamber (66) continues until just before the rotation angle of the rotating shaft (40) reaches 360 °. Then, the refrigerant in the expansion chamber (66) expands in the process of increasing the volume of the expansion chamber (66), and the rotation shaft (40) is rotationally driven by the expansion of the refrigerant. In this way, the refrigerant in the first low pressure chamber (74) flows into the second high pressure chamber (83) while expanding through the communication passages (93) and (64).

[0106] Next, a process in which the refrigerant flows out from the second low pressure chamber (84) of the second rotary mechanism section (80) will be described. The second low pressure chamber (84) begins to communicate with the outflow port (35) when the rotation angle of the rotating shaft (40) is 0 °. That is, the refrigerant begins to flow from the second low pressure chamber (84) to the outflow port (35). After that, the rotation angle of the rotating shaft (40) gradually increased to 90 °, 180 °, 270 ° and until the rotation angle reached 360 °, the second low pressure chamber (84) The low-pressure refrigerant after expansion flows out.

[0107] Mounting plate assembly procedure

The procedure for assembling the expansion mechanism (60), mounting plate (101), and heat insulating material (90, 96) will be described. First, a bolt (not shown) is passed through the bolt fastening hole (68) of the front head (61) and the bolt fastening hole (104a) of the mechanism side mounting portion (104) and tightened.

[0109] Next, the first heat insulating material (90) is attached from the lower side of the mounting plate (101), and the second heat insulating material (96) is attached from the upper side. Thus, since the heat insulating material (90, 96) is divided into the first heat insulating material (90) and the second heat insulating material (96), the heat insulating material (90, 96) can be easily assembled.

[0110] Finally, the outer end face of the casing side mounting portion (105) is welded to the inner face of the casing (31).

[0111] <Operation of mounting plate>

Due to the first heat insulating material (90), the internal space of the casing (31) has a first space (48) in which the expansion mechanism (60) is accommodated, and a second space (49) in which the compression mechanism (50) is accommodated. As a result, the first space (48) has a low temperature and high density, and the second space (49) has a high temperature and low density. As a result, the inside of the casing (31) is a so-called high-pressure dome type fluid machine that is maintained at a high temperature and a high pressure.

[0112] Since the expansion mechanism (60) is firmly fixed to the casing (31) by the mounting plate (101), the casing (31) is prevented from expanding due to the high-pressure refrigerant, and excessive vibration of the expansion mechanism (60) is prevented. Is prevented.

[0113] By fixing the low temperature expansion mechanism (60), which has a large temperature difference from the atmosphere in the casing (31), to the casing (31) via the mounting plate (101), the casing is fixed as in the conventional case. It is possible to prevent the expansion mechanism (60) and the casing (31) having a large temperature difference from the single (31) from being directly fixed. In addition, since the joint (67) between the mounting plate (101) and the casing (31) is only the casing-side mounting part (105), it is transmitted as compared with the case where it is joined to the casing (31) all around. The thermal area is getting smaller. For this reason, heat exchange by heat conduction between the low temperature refrigerant inside the expansion mechanism (60) and the high temperature refrigerant inside the compression mechanism (50) is reduced.

[0114] By disposing the mechanism-side mounting portion (104) and the casing-side mounting portion (105) in the circumferential direction, the heat transfer path is greater than when both mounting portions are provided at the same position in the circumferential direction. Increase the length with a force S. For this reason, the thermal resistance increases, and heat exchange between the expansion mechanism (60) and the casing (31) is reduced.

[0115] The cross-sectional area in the circumferential direction between the mechanism side mounting portion (104) and the casing side mounting portion (105) is The heat transfer area of the heat transfer path of the mounting plate (101) is reduced by making it smaller than the cross-sectional area in the circumferential direction of the single-side mounting portion (105). In addition, the mounting plate (101) has a sheet metal structure made of a thin plate, so that the heat transfer area of the heat transfer path is reduced. Further, by forming the through holes (106, 107) in the mounting plate (101), the heat transfer area of the heat transfer path is reduced. Furthermore, the periphery of the bolt fastening hole (68) protrudes upward and is formed, and the periphery of the bolt fastening hole (104a) protrudes downward to form the mechanism side mounting part (104) and joint part. The contact area with (67) is reduced. In this way, the heat transfer area of the heat transfer path between the mounting plate (101) and the expansion mechanism (60) is reduced, so heat exchange between the expansion mechanism (60) and the casing (31) is reduced. Is done.

[0116] Refrigerant convection is effective by dividing the first space (48) on the low-temperature expansion mechanism (60) side, which has a large temperature difference from the atmosphere in the casing (31), with the first heat insulating material (90). To be prevented.

[0117] Since the heat insulating material (90, 96) covers the entire exposed surface in the casing (31) of the expansion mechanism (60), it is covered with the internal space of the casing (31) and the heat insulating material (90, 96). Heat exchange with the broken expansion mechanism (60) is prevented. For this reason, heat exchange between the expansion mechanism (60) and the casing (31) is further reduced.

[0118] The mounting plate (101) is also covered with a heat insulating material (90, 96) to prevent heat exchange with the refrigerant, and between the expansion mechanism (60) and the casing (31). Heat exchange is reduced. For this reason, heat exchange due to heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced.

[0119] Effect of Embodiment 1

Therefore, according to the compression / expansion unit (30) of this embodiment, the low temperature expansion mechanism (60) having a large temperature difference from the atmosphere in the casing (31) is directly fixed to the casing (31). Only the mounting part (105) is fixed to the casing (31) via the mounting plate (101) welded to the casing (31), and the space between the high-temperature casing (31) and the low-temperature expansion mechanism (60) is fixed. By reducing heat exchange due to heat conduction, it is possible to prevent further decline in capacity and power recovery effect.

[0120] The mechanism side mounting part (104) of the annular mounting plate (101) and the casing side mounting part (105) are shifted in the circumferential direction to lengthen the heat transfer path and increase the thermal resistance. What you did As a result, it is possible to prevent further reduction in performance and power recovery effect.

[0121] The mounting plate (101) is a sheet metal structure composed of a thin plate, a plurality of through holes (106, 107) are provided, or the mechanism side mounting portion (104) and the joint portion (67) are projected. By reducing the heat transfer area of the heat transfer path in the mounting plate (101) and reducing heat exchange between the expansion mechanism (60) and the casing (31), the capacity is further reduced. And it can prevent the power recovery effect from decreasing.

[0122] By covering the entire exposed surface in the casing (31) of the expansion mechanism (60) with the heat insulating material (90, 96), the second space (48) of the casing (31) and the heat insulating material (90, 96 ) To prevent heat exchange with the expansion mechanism (60).

[0123] A heat insulating material (90, 96) is also provided in the plate outer peripheral gap (108) to prevent heat exchange with the refrigerant, and heat between the expansion mechanism (60) and the casing (31) is prevented. By reducing replacement, it is possible to prevent further reduction in capacity and power recovery effect.

[0124] By dividing the heat insulating material (90, 96) in the axial direction of the rotating shaft (40) with the mounting plate (101) as a boundary, the heat insulating material (90, 96) can be easily assembled and the manufacturing cost can be reduced. Can be lowered.

[0125] Modification 1 of Embodiment 1

As shown in FIG. 9, the mechanism-side mounting portion (104) has a higher surface temperature than the periphery of the expansion mechanism (60) and the periphery of the casing (31) in the vicinity of the portion and the expansion mechanism (60). Alternatively, it may be arranged so as to connect with a portion having a lower surface temperature. Note that the through holes (106, 107) are omitted for simplification.

[0126] Specifically, as shown in Fig. 10, the surface temperature of the expansion mechanism (60) is generally distributed in the circumferential direction so as to decrease in order from A to F when viewed from the axial direction. As the actual temperature, for example, A is the suction temperature 30 ° C F is the discharge temperature 0 ° C.

On the other hand, as shown in FIG. 11, the surface temperature of the casing (31) is distributed in the circumferential direction so as to decrease in order from A to F. For example, A is 90 ° C of the discharge temperature of the compression mechanism (50), and F is a low temperature (near 0 °) due to the discharge temperature of the expansion mechanism (60). [0128] Therefore, it is better to provide the mechanism side mounting portion (104) avoiding the low surface temperature portion of the expansion mechanism (60) and the high surface temperature portion of the casing (31)! With this configuration, the mechanism-side mounting portion (104) at one end of the heat transfer path in the mounting plate (101) moves the surface temperature of the expansion mechanism (60) and the casing (31) in the vicinity of the expansion mechanism (60). ), The heat input from the high temperature side to the low temperature side is reduced. For this reason, heat exchange due to heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced. Accordingly, it is possible to prevent a reduction in the capacity of the compression / expansion unit (30) and a reduction in the power recovery effect.

[0129] Modification 2 of Embodiment 1—

As shown in FIG. 12, the casing side mounting portion (105) has a higher surface temperature than the surroundings of the expansion mechanism (60), and more than the surroundings of the casing (31) in the vicinity of the portion and the expansion mechanism (60). You may arrange | position so that a part with low surface temperature may be tied. Note that the through holes (106, 107) are omitted for simplification.

[0130] That is, since the expansion mechanism (60) is kept at a low temperature as a whole, the casing-side mounting portion (105) should be provided avoiding the portion A having the highest surface temperature of the casing (31). ! / Since the temperature of the casing (31) is inevitably lowered between the inflow pipe (38) and the outflow pipe (39), it is preferable to provide the casing side mounting portion (105) at this position. With this configuration, the casing-side mounting portion (105) at one end of the heat transfer path in the mounting plate (101) is connected to the surface temperature of the expansion mechanism (60) and the casing ( 31), the heat input from the high temperature side to the low temperature side is reduced. For this reason, heat exchange due to heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced. Accordingly, it is possible to prevent a reduction in the capacity of the compression / expansion unit (30) and a reduction in the power recovery effect.

[0131] Modification 3 of Embodiment 1—

As shown in FIG. 13, between the mechanism side mounting portion (104) and the joint portion (67) joined to the mechanism side mounting portion (104) in the expansion mechanism (60), a heat insulating material is used. A heat insulating spacer (110) may be arranged. The insulation spacer (110) is always installed near the expansion mechanism (60), which is kept at a relatively low temperature. High degree.

[0132] This configuration increases the thermal resistance between the mounting plate (101) and the expansion mechanism (60), so that heat exchange between the expansion mechanism (60) and the casing (31) can be achieved. Is reduced. For this reason, heat exchange due to heat conduction between the low-temperature refrigerant inside the expansion mechanism (60) and the high-temperature refrigerant inside the compression mechanism (50) is reduced. Accordingly, it is possible to prevent a reduction in the capacity of the compression / expansion unit (30) and a reduction in the power recovery effect.

[0133] (Other Embodiments)

The present invention may be configured as follows with respect to the above embodiment.

That is, in the above embodiment, the high-pressure dome type compression / expansion unit (30) is used. However, as the so-called low-pressure dome type compression / expansion unit (30) in which the inside of the casing (31) has a low pressure. Also good. In this case, the refrigerant circuit (20) force and the refrigerant are directly introduced into the compression mechanism (50), and the compressed refrigerant is directly discharged out of the casing (31). The compression mechanism (50) is fixed to the casing (31) via a mounting plate (101) having a shape similar to that of the above embodiment and having a high thermal resistance. By fixing the high-temperature compression mechanism (50), which has a large temperature difference from the atmosphere in the casing (31), to the low-temperature casing (31) via the mounting plate (101), the low-temperature casing (31) Heat exchange by heat conduction with the hot expansion mechanism (60) is reduced. Therefore, it is possible to prevent a decline in capacity and power recovery effect.

[0135] In each of the above embodiments, the expansion mechanism (60) is constituted by a swinging piston type rotary expander. However, the expansion mechanism (60) may be constituted by a rolling piston type rotary expander. Good. In the expansion mechanism (60), the blades (76, 86) are formed separately from the pistons (75, 85) in each rotary mechanism (70, 80). The tip of the blade (76, 86) is pressed against the outer peripheral surface of the piston (75, 85), and moves forward and backward as the piston (75, 85) moves.

In each of the above embodiments, the compression mechanism (50) is a swinging piston type rotary compressor and the expansion mechanism (60) is a swinging piston type rotary expander. It may be a thing.

[0137] In the above embodiment, the pre-between the mounting plate (101) and the casing (31). If the coolant gap in the outer periphery of the plate (108) is above a certain level (for example, 5mm or more) and the refrigerant is stagnant in the outer periphery of the plate (108), heat insulation (90, 96) is placed in the gap. It does not have to be provided. In other words, the thermal conductivity of the resin-based material composing the general heat insulating material (90, 96) is 0.3 w / m—k, whereas the thermal conductivity of the carbon dioxide refrigerant is in the space on the expansion mechanism (60) side. 0.07w / m—k, and the carbon dioxide refrigerant is one order lower than the resin material. Thus, since the heat transfer coefficient of the gas refrigerant is smaller than that of the heat insulating material (90, 96), the heat exchange is rather reduced.

[0138] In the above embodiment, the mechanism-side mounting portion (104) and the casing-side mounting portion (105) are provided at three locations at equal intervals in the circumferential direction, but two or four or more locations are provided. Also good. Even in this case, the mechanism-side mounting portion (104) and the casing-side mounting portion (105) are preferably arranged in a circumferential direction.

[0139] In the above embodiment, the first and second heat insulating materials (90, 96) are formed of high heat resistance! /, Special engineering plastic, but the temperature comparison as in the first embodiment. When it is provided on the side of the low expansion mechanism (60), the refrigerant temperature is 100 ° C or lower, so it may be formed of low heat resistance / general-purpose engineering plastic. For example, POM (polyacetal) can be considered. Epoxy and FRP may also be used, but FRP has the disadvantage that the thermal conductivity increases when carbon, glass fiber, or the like is contained.

[0140] In each of the above embodiments, the refrigerant is carbon dioxide, but R410A, R407C, or isobutane may be used.

[0141] In each of the above embodiments, the electric motor (4) is disposed above the compression mechanism (50) in the second space (49).

5) Placed force S, may be placed under the compression mechanism (50)! /.

[0142] The above embodiment is an essentially preferable example, and the present invention and its applied products.

, Or not intended to limit the scope of its use.

Industrial applicability

[0143] As described above, the present invention is useful for a fluid machine in which a compression mechanism and an expansion mechanism are housed in one casing.

Claims

The scope of the claims

[1] A fluid machine provided in a refrigerant circuit (20) for performing a refrigeration cycle by circulating refrigerant,

A casing (31);

A compression mechanism (50) accommodated in the casing (31) for compressing the refrigerant; an expansion mechanism (60) accommodated in the casing (31) for expanding the refrigerant; and the casing (31) provided with the above-mentioned A rotating shaft (40) connecting the compression mechanism (50) and the expansion mechanism (60);

A mounting plate (101) for fixing the compression mechanism (50) or the expansion mechanism (60) to the casing (31).

A fluid machine characterized by that.

[2] In the fluid machine according to claim 1,

The casing (31) has a cylindrical container shape,

The mounting plate (101) is formed in an annular shape, a mechanism side mounting portion (104) for fixing the compressor mechanism (50) or the expansion mechanism (60) on the inner peripheral side, and the casing ( And a casing side mounting portion (105) fixed to 31),

The casing side mounting portion (105) protrudes radially outward, and a predetermined plate outer circumferential clearance (108) is formed between the casing side mounting portions (105) and the inner surface of the casing (31).

The mechanism side mounting portion (104) and the casing side mounting portion (105) are arranged so as to be shifted in the circumferential direction.

A fluid machine characterized by that.

[3] In the fluid machine according to claim 2,

The refrigerant is directly introduced into the compression mechanism (50) from the refrigerant circuit (20), and the compressed refrigerant is discharged into the internal space (49) in the casing (31) by the compression mechanism (50) force. Configured to flow out of the internal space (49) and out of the casing (31),

The expansion mechanism (60) is fixed to the casing (31) via the mounting plate (101). A fluid machine characterized by that.

[4] In the fluid machine according to claim 2,

The refrigerant circuit (20) force is configured such that the refrigerant is directly introduced into the compression mechanism (50), and the compressed refrigerant is directly discharged out of the casing (31),

The compression mechanism (50) is fixed to the casing (31) via the mounting plate (101).

A fluid machine characterized by that.

[5] The fluid machine according to claim 3,

The mechanism-side mounting portion (104) has a surface temperature higher than that of the expansion mechanism (60) around the casing and the casing (31) in the vicinity of the expansion mechanism (60). Low level, arranged to connect the part

A fluid machine characterized by that.

[6] In the fluid machine according to claim 3,

The casing-side mounting portion (105) includes a portion having a surface temperature higher than that of the periphery of the expansion mechanism (60) and a portion having a surface temperature lower than that of the casing (31) in the vicinity of the expansion mechanism (60). It is arranged to tie

A fluid machine characterized by that.

[7] In the fluid machine according to claim 2,

The mounting plate (101) has a circumferential cross-sectional area between the mechanism-side mounting portion (104) and the casing-side mounting portion (105) that is greater than the circumferential cross-sectional area of the casing-side mounting portion (105). Is getting smaller

A fluid machine characterized by that.

[8] In the fluid machine according to claim 2,

The mounting plate (101) has a sheet metal structure.

A fluid machine characterized by that.

[9] In the fluid machine according to claim 2,

The mounting machine (101) includes a plurality of through holes (106, 107).

[10] In the fluid machine according to claim 2,

A heat insulating material provided in the internal space of the casing (31), covers the entire exposed surface in the casing (31) of the compression mechanism (50) or the expansion mechanism (60), and penetrates the rotating shaft (40) ( 90, 96)

A fluid machine characterized by that.

[11] The fluid machine according to claim 10,

The heat insulating material (90, 96) is divided into a first heat insulating material (90) and a second heat insulating material (96) in the axial direction of the rotating shaft (40) with the mounting plate (101) as a boundary! /

A fluid machine characterized by that.

[12] The fluid machine according to claim 10,

The fluid machine, wherein the heat insulating material (90, 96) is also provided in the outer circumferential clearance (108) of the plate.

[13] The fluid machine according to claim 2,

At least one of the mechanism side mounting portion (104) and the joint portion (67) joined to the mechanism side mounting portion (104) in the compression mechanism (50) or the expansion mechanism (60) has a contact area. Protruding to reduce size

A fluid machine characterized by that.

[14] The fluid machine according to claim 2,

Between the mechanism side mounting portion (104) and the joint portion (67) joined to the mechanism side mounting portion (104) in the compression mechanism (50) or the expansion mechanism (60), a heat insulating material is used. Insulating spacer (110) is placed

A fluid machine characterized by that.

[15] The fluid machine according to claim 2,

The fluid circuit, wherein the refrigerant circuit (20) performs a supercritical refrigeration cycle using carbon dioxide as a refrigerant.