JP2008175496A - Expander-integrated compressor and refrigeration cycle apparatus including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain decrease in enthalpy of a refrigerant discharged from a compression mechanism and lowering of heating capability of a refrigerating cycle device due to movement of heat of compressed refrigerant in high temperature state to the expansion mechanism in the low temperature state in a process where the compressed refrigerant flows in a sealed container in an expander integrated compressor. <P>SOLUTION: This expander integrated compressor 2 includes: the compression mechanism 3 for compressing the refrigerant; a motor 5 for driving the compression mechanism 3; the expansion mechanism 4 for expanding the refrigerant; a shaft 6 connecting the compression mechanism 3, the motor 5 and the expansion mechanism 4 to one another; the sealed container 21 housing the compression mechanism 3, the motor 4, the expansion mechanism 4 and the shaft 5, in which space is formed in the interior, and the compressed refrigerant flows through the internal space; and a heat exchange promoting part 53 for promoting heat exchange between the refrigerant before it flows through the internal space of the sealed container 21 and the refrigerant after it flows through the internal space of the sealed container 21, wherein quantity of heat moving from high-temperature compressed refrigerant to low-temperature expansion mechanism 4 is decreased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an expander-integrated compressor provided with a compression mechanism for compressing a fluid and an expansion mechanism for expanding a fluid in the same sealed container, and further, the expander-integrated compressor is provided. The present invention relates to the refrigeration cycle apparatus used.

  2. Description of the Related Art Conventionally, a power recovery type refrigeration cycle apparatus that recovers expansion energy of a refrigerant by an expansion mechanism and uses the recovered energy as part of work of a compression mechanism is known. As such a refrigeration cycle apparatus, for example, a refrigeration cycle apparatus using a fluid machine (an expander-integrated compressor) in which an expansion mechanism and a compression mechanism are connected by a drive shaft is known (for example, see Patent Document 1). ).

  Hereinafter, a conventional expander-integrated compressor will be described.

  FIG. 8 is a longitudinal sectional view of a conventional expander-integrated compressor 100. As shown in FIG. 8, the expander-integrated compressor 100 includes an expansion mechanism 101, an electric motor 102, a compression mechanism 103, and a casing 104 that houses these in order from top to bottom. The expansion mechanism 101, the electric motor 102, and the compression mechanism 103 are connected by a drive shaft 105. In the casing 104, a suction port 106 for introducing the refrigerant into the compression mechanism 103, a discharge port 107 for leading the compressed refrigerant out of the casing 104, an inflow port 108 for introducing the refrigerant into the expansion mechanism 101, An outflow port 109 for leading the expanded refrigerant out of the casing 104 is provided.

  An oil pump 111 for pumping up the lubricating oil stored at the bottom of the casing 104 is installed at the lower end of the drive shaft 105. The lubricating oil pumped up by the oil pump 111 is supplied to the compression mechanism 103 and the expansion mechanism 101 via an oil supply passage 110 formed in the drive shaft 105.

  Next, the flow of the refrigerant will be described.

  The high-temperature and high-pressure refrigerant compressed by the compression mechanism 103 is discharged from the discharge port 103 a of the compression mechanism 103 into the casing 104. The refrigerant discharged into the casing 104 flows out of the casing 104 from the discharge port 107 toward the radiator (not shown) after passing through the electric motor 102. The refrigerant that has flowed out of the casing 104 is cooled by passing through the radiator, and is in an intermediate temperature and high pressure state.

  The refrigerant that has passed through the radiator flows into the expansion mechanism 101 from the inflow port 108. The refrigerant that has flowed into the expansion mechanism 101 expands to a low temperature and low pressure state. At this time, expansion energy is generated by adiabatic expansion of the refrigerant inside the expansion mechanism 101. This expansion energy is recovered by the expansion mechanism 101 and used as part of the energy for driving the drive shaft 105. The expanded refrigerant flows out of the casing 104 from the outflow port 109 toward the evaporator (not shown). The refrigerant that has flowed out of the outflow port 109 is heated by passing through the evaporator, and becomes a medium temperature and low pressure state.

The refrigerant that has passed through the evaporator is sucked into the compression mechanism 103 from the suction port 106 and compressed again.
JP 2003-139059 A

  In the conventional expander-integrated compressor 100, in order to reduce the amount of lubricating oil contained in the compressed refrigerant, the compressed refrigerant discharged from the compression mechanism 103 is not directly discharged out of the casing 104, but in the casing 104. After flowing through the space, it is discharged out of the casing 104.

  However, the compressed refrigerant is in a high temperature state by being compressed, and the heat of the high temperature compressed refrigerant moves to the low temperature expansion mechanism 101 in the process in which the compressed refrigerant flows in the casing 104. Therefore, the enthalpy of the refrigerant discharged from the casing 104 is reduced. As a result, there has been a problem that the heating capacity of the refrigeration cycle apparatus is reduced.

  The present invention has been made in view of such points, and can reduce the amount of heat transferred from the compressed refrigerant to the low-temperature expansion mechanism, and can suppress a decrease in the enthalpy of the refrigerant discharged from the sealed container. An object is to provide an expander-integrated compressor.

  In this specification, “flow” means that the refrigerant discharged from the compression mechanism into the casing (sealed container) passes around the motor and the expansion mechanism before being discharged out of the casing (sealed container). Means a moving state.

  An expander-integrated compressor according to the present invention includes a compression mechanism structure that compresses refrigerant, an electric motor that drives the compression mechanism, an expansion mechanism that expands refrigerant, the compression mechanism, the electric motor, and the expansion mechanism. A shaft to be coupled, a compression container, the electric motor, the expansion mechanism, and the shaft, and a space is formed therein; a sealed container in which a refrigerant compressed by the compression mechanism flows in the internal space; And a heat exchange promoting part that promotes heat exchange between the refrigerant before flowing in the inner space of the sealed container and the refrigerant after flowing in the inner space of the sealed container.

  Further, another expander-integrated compressor according to the present invention includes a compression mechanism that compresses a refrigerant, an electric motor that drives the compression mechanism, an expansion mechanism that expands the refrigerant, the compression mechanism, the electric motor, and the expansion. A sealed container in which a shaft connecting the mechanism, the compression mechanism, the electric motor, the expansion mechanism, and the shaft are accommodated and a space is formed therein, and the refrigerant compressed by the compression mechanism flows in the internal space And a discharge pipe for discharging the refrigerant in the internal space of the sealed container to the outside, and absorbing heat from the refrigerant discharged from the compression mechanism, and releasing this heat to the refrigerant before being discharged from the discharge pipe And a heat exchange promoting part.

  In this specification, the “heat exchange promoting part” refers to heat exchange between the refrigerant before flowing in the inner space of the sealed container and the refrigerant after flowing in the inner space of the sealed container, or a compression mechanism. The part which accelerates | stimulates the heat exchange between the refrigerant | coolant discharged from the refrigerant | coolant and the refrigerant | coolant before being discharged from a discharge pipe rather than before.

  With the above configuration, the high-temperature refrigerant discharged from the compression mechanism absorbs heat by the heat exchange promoting unit before flowing in the internal space of the sealed container, and the temperature decreases. The refrigerant whose temperature has decreased flows in the internal space of the sealed container. The refrigerant after flowing through the internal space of the sealed container is heated by the heat exchange promoting unit, and the temperature rises. The refrigerant whose temperature has risen is discharged outside the sealed container.

  According to the expander-integrated compressor of the present invention, since the refrigerant discharged from the compression mechanism absorbs heat before flowing in the sealed container, the temperature of the refrigerant flowing in the sealed container is discharged from the compression mechanism. The temperature becomes lower than the temperature of the refrigerant immediately after. Therefore, since the temperature difference between the refrigerant flowing around the expansion mechanism and the expansion mechanism is small, the amount of heat transferred from the refrigerant to the expansion mechanism can be reduced. As a result, it is possible to suppress a decrease in the enthalpy of the refrigerant discharged from the sealed container.

  Embodiments of an expander-integrated compressor according to the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a configuration diagram of an expander-integrated compressor 2 according to Embodiment 1 of the present invention. In addition, the arrow in FIG. 1 represents the flow of the refrigerant.

  As shown in FIG. 1, the expander-integrated compressor 2 includes a compression mechanism 3 that compresses a refrigerant, an electric motor 5, and an expansion mechanism 4 that expands the refrigerant in order from the top to the bottom in a sealed container 21. These are configured by connecting them uniaxially with a shaft 6. The compression mechanism 3 is connected to the evaporator 7 (see FIG. 2) via the suction pipe 49 and is connected to the radiator 8 via the discharge pipe 50. The expansion mechanism 4 is connected to the radiator 8 through the suction pipe 47 and is connected to the evaporator 7 through the discharge pipe 48.

  An oil reservoir 23 for storing lubricating oil is formed at the bottom of the sealed container 21. An oil pump 29 that pumps up lubricating oil is provided at the lower end of the shaft 6, and the oil pump 29 is immersed in the lubricating oil in the oil reservoir 23. An oil supply path 58 extending in the axial direction of the shaft 6 is formed inside the shaft 6, and the oil supply path 58 serves as a path for supplying lubricating oil to the compression mechanism 3 and the expansion mechanism 4. ing.

FIG. 2 is a schematic diagram showing a refrigeration cycle apparatus 1 according to Embodiment 1 of the present invention. As shown in FIG. 2, the expander-integrated compressor 2 according to Embodiment 1 of the present invention is incorporated in the refrigerant circuit of the refrigeration cycle apparatus 1. The refrigerant circuit is filled with carbon dioxide (CO ₂ ) as a refrigerant that becomes a supercritical state in the high-pressure portion (the portion from the compression mechanism 3 through the radiator 8 to the expansion mechanism 4).

  The type of the refrigerant in the first embodiment of the present invention is not particularly limited, and may be a refrigerant that does not enter a supercritical state during operation of the refrigeration cycle apparatus 1 (for example, a chlorofluorocarbon refrigerant). .

  In Embodiment 1 of the present invention, the refrigerant circuit of the refrigeration cycle apparatus 1 is a refrigerant circuit that allows the refrigerant to flow only in one direction. However, the present invention is not limited to this, and the refrigerant distribution direction can be changed. A simple refrigerant circuit may be used. For example, a refrigerant circuit capable of heating operation and cooling operation may be provided by installing a four-way valve or the like.

  Hereinafter, the expander-integrated compressor 2 according to Embodiment 1 of the present invention will be specifically described.

<Configuration of the expansion mechanism 4>
As shown in FIG. 1, the expansion mechanism 4 is a rotary type, and includes a first expansion portion 4a and a second expansion portion 4b in order from the bottom to the top.

  The first inflating portion 4a includes a substantially cylindrical cylinder 24a and a cylindrical piston 25a inserted into the cylinder 24a. A vane groove extending in the radial direction is formed in the cylinder 24a, and a vane 27a and a spring 22a for biasing the vane 27a toward the piston 25a are provided in the vane groove.

  The 2nd expansion part 4b has the structure substantially the same as the 1st expansion part 4a. That is, the second expansion portion 4b includes a substantially cylindrical cylinder 24b and a cylindrical piston 25b inserted into the cylinder 24b. A vane groove extending in the radial direction is formed in the cylinder 24b, and a vane 27b and a spring 22b that urges the vane 27b toward the piston 25b are provided in the vane groove. The height of the second expansion portion 4b in the axial direction of the shaft 6 is higher than that of the first expansion portion 4a.

  The expansion mechanism 4 has slidable first and second eccentric portions 28a and 28b formed on the shaft 6 inside the pistons 25a and 25b, respectively. Thereby, piston 25a, 25b is controlled by the 1st eccentric part 28a and the 2nd eccentric part 28b so that the inside of cylinder 24a, 24b may turn in the state eccentric.

  The first inflating part 4 a and the second inflating part 4 b are partitioned by a partition plate 30. The partition plate 30 is formed with a communication hole 59 that allows the first expansion chamber 26a and the second expansion chamber 26b to communicate with each other. The first expansion chamber 26a and the second expansion chamber 26b may be expansion chambers that individually expand the refrigerant, but in the first embodiment of the present invention, these expansion chambers 26a are formed by the communication holes 59. , 26b are formed as one expansion chamber. That is, in Embodiment 1 of the present invention, the refrigerant continuously expands in the first expansion chamber 26a and the second expansion chamber 26b.

  A lower bearing 31 is provided at the lower part of the first inflating part 4a, and an upper bearing 32 is provided at the upper part of the second inflating part 4b. The lower bearing 31 and the upper bearing 32 support the shaft 6, respectively. .

  The first expansion chamber 26a in the first expansion portion 4a is formed by the inner peripheral surface of the cylinder 24a, the outer peripheral surface of the piston 25a, the partition plate 30, and the lower bearing 31, and the vane 27a is connected to the high-pressure side expansion chamber. It is partitioned into an expansion chamber on the low pressure side. The second expansion chamber 26b in the second expansion portion 4b is formed by the inner peripheral surface of the cylinder 24b, the outer peripheral surface of the piston 25b, the partition plate 30, and the upper bearing 32, and is expanded on the high pressure side by the vane 27b. It is partitioned into a chamber and a low pressure side expansion chamber.

  The suction pipe 47 penetrates the sealed container 21 and is connected to the upper bearing 32. A series of suction passages 34 are formed in the upper bearing 32, the cylinder 24 b, the partition plate 30, the cylinder 24 a, and the lower bearing 31. The suction passage 34 communicates with the suction pipe 47 and guides the refrigerant sucked from the suction pipe 47 to the first expansion chamber 26a.

  The discharge pipe 48 passes through the sealed container 21 and is connected to the upper bearing 32. A discharge path 33 is formed in the upper bearing 32. The discharge path 33 communicates with the discharge pipe 48 and guides the refrigerant after expansion of the second expansion chamber 26 b to the discharge pipe 48.

<Configuration of compression mechanism 3>
As shown in FIG. 1, the compression mechanism 3 is a scroll type, and includes a fixed scroll 35, a movable scroll 36 that is opposed to the fixed scroll 35 in the axial direction of the shaft 6, and a shaft 6 that supports the movable scroll 36. And a bearing 37 that supports the shaft 6.

  The fixed scroll 35 is formed with a wrap 38 having a spiral shape (for example, an involute shape) and a discharge port 40 opening upward. The movable scroll 36 is formed with a wrap 39 that meshes with the wrap 38 of the fixed scroll 35. A plurality of spaces formed by the wraps 38 and 39 are partitioned as a spiral compression chamber 41. The movable scroll 36 is supported by an eccentric portion 42 formed at the upper end of the shaft 6, and revolves in a state of being eccentric from the axis of the shaft 6. An Oldham ring 43 that prevents the movable scroll 36 from rotating is disposed below the movable scroll 36.

  A cover 44 is provided on the upper side of the fixed scroll 35 and on the sides of the fixed scroll 35 and the bearing 37. A discharge path through which the refrigerant discharged from the discharge port 40 of the compression mechanism 3 flows between the upper surface of the fixed scroll 35 and the cover 44 and between the side surface of the fixed scroll 35 and the side surface of the bearing 37 and the cover 44. 45 is formed. With such a configuration, the refrigerant discharged from the discharge port 40 is once discharged into the space in the cover 44 and then discharged below the compression mechanism 3 through the discharge path 45.

  The suction pipe 49 penetrates the sealed container 21 and is connected to the fixed scroll 35. The discharge pipe 50 penetrates and is connected to the upper part of the sealed container 21. That is, the lower end of the discharge pipe 50 is open to the space above the compression mechanism 3 in the sealed container 21. Strictly speaking, the lower end of the discharge pipe 50 opens into the space above the cover 44 in the sealed container 21. The compression mechanism 3 is joined to the inner wall of the sealed container 21 by welding or the like.

<Configuration of electric motor 5>
As shown in FIG. 1, the electric motor 5 includes a rotor 5 a fixed to the middle portion of the shaft 6 and a stator 5 b disposed at a predetermined interval on the outer peripheral side of the rotor 5 a. . The electric motor 5 is fixed to the sealed container 21 by joining the stator 5 b to the inner wall of the sealed container 21 by welding or the like.

<Configuration of Heat Exchange Promotion Unit 53>
FIG. 3A is a longitudinal sectional view of the expander-integrated compressor 2 taken along the line IIIa-IIIa in FIG. FIG. 3B is a cross-sectional view of the expander-integrated compressor 2 taken along the line IIIb-IIIb in FIG. 3A. The heat exchange promoting part 53 in the first embodiment of the present invention moves the heat absorbing part that absorbs heat from the refrigerant just before being discharged from the compression mechanism 3 into the sealed container 21 and the heat absorbed by the heat absorbing part to the heat radiating part. And a heat radiating section that radiates heat sent from the heat transfer section to the refrigerant just before being discharged from the sealed container 21.

  As shown in FIGS. 3A and 3B, in the space above the fixed scroll 35 in the discharge passage 45, a first heat transfer body 51 a is provided as a heat absorption part of the heat exchange promoting part 53. Further, a second heat transfer body 51 b is provided as a heat dissipating part of the heat exchange promoting part 53 in and near the discharge pipe 50 of the sealed container 21. The first heat transfer body 51a and the second heat transfer body 51b are members that exchange heat with the gas refrigerant while allowing the gas refrigerant to pass therethrough. The specific configurations of the first heat transfer body 51a and the second heat transfer body 51b are not particularly limited, but those that have a low flow resistance of the gas refrigerant and that can easily exchange heat with the gas refrigerant are preferable. For example, as the first heat transfer body 51a and the second heat transfer body 51b, a thin film or a thin wire made of a material having a high thermal conductivity, or a multi-layer flat plate having a large number of pores and fine grooves is suitably used. Can be used.

  As the heat transfer part of the heat exchange promoting part 53, a heat transfer part that favorably transfers heat absorbed by the heat absorption part to the heat dissipation part is preferable. In the present embodiment, a heat pipe 46 is provided as the heat exchange promoting portion 53. The heat pipe 46 extends through the cover 44 in the vertical direction, and connects the first heat transfer body 51a and the second heat transfer body 51b. The heat pipe 46 moves the heat absorbed by the first heat transfer body 51a to the second heat transfer body 51b. The heat pipe 46 has a wick and hydraulic fluid in a cylindrical metal container. The portions excluding the upper and lower end portions of the heat pipe 46 are covered with a heat insulating material 60 to form a heat insulating portion 46b. The lower end portion of the heat pipe 46 is not covered with the heat insulating material 60, and is an evaporation portion 46a in which the hydraulic fluid evaporates by absorbing heat. On the other hand, the upper end portion of the heat pipe 46 is not covered with the heat insulating material 60, and is a condensing portion 46c in which the vapor of the working fluid is condensed by releasing heat.

  In addition, the heat transfer part of the heat exchange promotion part 53 in Embodiment 1 of this invention is not restricted to the above-mentioned heat pipe 46, For example, it is a heat insulating material to the solid rod body which consists of silver, copper, aluminum alloy etc. May be coated. The heat transfer part of the heat exchange promotion part 53 should just transmit heat from a heat absorption part to a thermal radiation part. The shape of the heat transfer section is not limited to a rod shape.

<Operation of the expander-integrated compressor 2>
In the expander-integrated compressor 2 according to Embodiment 1 of the present invention, the shaft 6 rotates when the electric motor 5 is driven.

  In the expansion mechanism 4, the pistons 25 a and 25 b rotate with the rotation of the shaft 6. As a result, the high-pressure refrigerant sucked from the suction pipe 47 flows into the first expansion chamber 26 a through the suction passage 34. The high-pressure refrigerant flowing into the first expansion chamber 26a expands in the first expansion chamber 26a and the second expansion chamber 26b, and becomes a low-pressure refrigerant. The low-pressure refrigerant flows into the discharge pipe 48 through the discharge path 33 and is discharged outside the sealed container 21.

  In the compression mechanism 3, the movable scroll 36 turns with the rotation of the shaft 6. Thereby, the refrigerant is sucked from the suction pipe 49. The sucked low-pressure refrigerant is compressed in the compression chamber 41 and then discharged as a high-pressure refrigerant from the discharge port 40 to the discharge passage 45. Then, the refrigerant discharged from the discharge port 40 is guided to the lower side of the compression mechanism 3 through the discharge path 45, flows in the sealed container 21, and then is discharged to the outside of the sealed container 21 through the discharge pipe 50.

<Operation of Heat Exchange Promoter 53>
First, the effect | action of the heat pipe 46 which comprises a heat-transfer part is demonstrated. As described above, the heat pipe 46 includes the evaporation unit 46a, the heat insulating unit 46b, and the condensing unit 46c. The hydraulic fluid in the heat pipe 46 is heated and evaporated by the evaporation unit 46a, and moves to the condensing unit 46c via the heat insulating unit 46b by the capillary action of the wick. Thereafter, the vapor of the working fluid is condensed and dissipated in the condensing part 46c which is a low temperature part. Therefore, by using the heat pipe 46, heat can be easily transferred from the heat absorbing portion to the heat radiating portion. That is, by using the heat pipe 46, heat can be easily transmitted to a remote place. In Embodiment 1 of this invention, the 1st heat transfer body 51a and the 2nd heat transfer body 51b are connected with the heat pipe 46, The high temperature 1st heat transfer body 51a is changed into the low temperature 2nd heat transfer body 51b. On the other hand, the heat of the refrigerant immediately before being discharged from the compression mechanism 3 into the sealed container 21 is moved.

  Next, the operation of the first heat transfer body 51a that is the heat absorption part and the second heat transfer body 51b that is the heat dissipation part will be described. The first heat transfer body 51 a in the discharge path 45 absorbs the heat of the refrigerant immediately before being discharged from the compression mechanism 3 into the sealed container 21. The absorbed heat moves from the first heat transfer body 51a to the second heat transfer body 51b via the heat pipe 46. The refrigerant immediately before being discharged from the compression mechanism 3 into the sealed container 21 through the discharge path 45 is deprived of heat by the first heat transfer body 51a, and then is discharged from the discharge path 45 and flows in the sealed container 21. Thereafter, immediately after being discharged from the sealed container 21, it is heated by the second heat transfer body 51 b and then discharged outside the sealed container 21.

  As described above, according to the first embodiment of the present invention, by using the first heat transfer body 51a, the second heat transfer body 51b, and the heat pipe 46, which are the heat exchange promoting parts 53, Heat can be exchanged between the refrigerant before flowing in the internal space and the refrigerant after flowing in the sealed container 21.

  In the conventional expander-integrated compressor, the high-temperature refrigerant directly discharged from the compression mechanism into the sealed container flows in the sealed container and heats the low-temperature expansion mechanism. In other words, heat transfer is performed from the high-temperature refrigerant directly discharged from the compression mechanism into the sealed container to the expansion mechanism. In contrast, in the expander-integrated compressor 2 according to Embodiment 1 of the present invention, the high-temperature refrigerant discharged from the discharge port 40 of the compression mechanism 3 is cooled by the first heat transfer body 51a and then sealed. It is discharged into the container 21 and flows in the sealed container 21. That is, the refrigerant having a temperature lower than that of the refrigerant discharged from the high-temperature compression mechanism 3 flows in the sealed container 21. Therefore, the temperature difference between the refrigerant discharged from the compression mechanism 3 into the sealed container 21 and the expansion mechanism 4 is reduced, and the amount of heat transfer between the refrigerant and the expansion mechanism 4 can be reduced.

  According to the expander-integrated compressor 2 according to Embodiment 1 of the present invention, the cover 44 that covers a part of the upper side and the side of the compression mechanism 3 is provided. A discharge path 45 that guides the refrigerant discharged from the discharge port 40 to the internal space of the sealed container 21 is formed. The first heat transfer body 51 a is disposed inside the cover 44, the heat pipe 46 extends through the cover 44 in the vertical direction, and the second heat transfer body 51 b is disposed outside the cover 44. . Thereby, the refrigerant | coolant discharged from the compression mechanism 3 can be smoothly guide | induced in order of the 1st heat exchanger 51a, the internal space of the airtight container 21, and the 2nd heat exchanger 51b, and the above-mentioned effect is exhibited notably. be able to.

  By the way, since a high-temperature refrigerant | coolant has a density lower than a low-temperature refrigerant | coolant, the temperature distribution of the refrigerant | coolant in the airtight container 21 has a preferable distribution where temperature falls from the top to the bottom. According to the expander-integrated compressor 2 according to Embodiment 1 of the present invention, the compression mechanism 3 is disposed above the expansion mechanism 4. That is, the compression mechanism 3 that is in a high temperature state is disposed on the upper side in the sealed container 21, and the expansion mechanism 4 that is in a low temperature state is disposed on the lower side in the sealed container 21. Further, the discharge pipe 50 is connected to a portion of the sealed container 21 above the compression mechanism 3, specifically, an upper wall of the sealed container 21. Thereby, the movement of heat between the refrigerant discharged from the compression mechanism 3 and the expansion mechanism 4 can be more effectively suppressed.

  In Embodiment 1 of the present invention, without providing the first heat transfer body 51a and the second heat transfer body 51b, the evaporation part 46a and the condensation part 46c of the heat pipe 46 are used as a heat absorption part and a heat release part, respectively. Even if heat is directly exchanged with the refrigerant discharged from the compression mechanism 3, the same effect as described above can be obtained. That is, even if the heat exchange promoting part is constituted by the heat pipe 46, the same effect as described above can be obtained.

  FIG. 4 is a Mollier diagram showing the relationship between refrigerant pressure and enthalpy in a refrigeration cycle apparatus using an expander-integrated compressor. Hereinafter, a Mollier diagram in the refrigeration cycle apparatus when the expander-integrated compressor 2 according to Embodiment 1 of the present invention is used and when a conventional expander-integrated compressor is used will be described.

  4 represents the state of the refrigerant when there is no heat transfer between the refrigerant discharged from the compression mechanism and the expansion mechanism. In the expansion mechanism, the expansion energy (La ). At this time, the temperature of the discharged refrigerant in the sealed container is the highest.

  In the conventional expander-integrated compressor, the high-temperature refrigerant directly discharged from the compression mechanism into the sealed container flows in the sealed container as it is, and the heat of the discharged refrigerant moves to the low-temperature expansion mechanism. It looks like line B. Therefore, since the enthalpy of the refrigerant in the expansion mechanism is increased, the expansion energy (Lb) recovered by the expansion mechanism is increased, and is larger than the expansion energy (La) in the completely insulated state. On the other hand, since the heat quantity of the refrigerant discharged from the compression mechanism is taken away by the expansion mechanism, the enthalpy of the refrigerant discharged from the sealed container is reduced.

  However, in the expander-integrated compressor 2 according to Embodiment 1 of the present invention, since the refrigerant having a temperature lower than that of the high-temperature refrigerant discharged from the discharge port 40 of the compression mechanism 3 flows in the sealed container 21, Since the temperature difference between the refrigerant discharged from the compression mechanism 3 into the sealed container 21 and the expansion mechanism 4 is reduced and the heat transfer of the refrigerant to the expansion mechanism 4 is reduced, the operation line C is obtained. That is, in Embodiment 1 of the present invention, the heat of the refrigerant moves to the first heat transfer body 51a in the vicinity of the discharge port 40 of the compression mechanism 3, and is discharged from the compression mechanism 3 flowing in the sealed container 21. The refrigerant temperature can be lowered.

  Therefore, as compared with the conventional expander-integrated compressor, the expander-integrated compressor 2 according to the first embodiment of the present invention increases the enthalpy of the refrigerant in the expansion mechanism 4 and collects it by the expansion mechanism 4. An increase in expansion energy can be suppressed. As a result, in Embodiment 1 of the present invention, the expansion energy (Lc) recovered by the expansion mechanism 4 can be reduced as compared with the expansion energy (Lb) recovered by the conventional expansion mechanism.

  In the expander-integrated compressor 2 according to Embodiment 1 of the present invention, the refrigerant is sequentially supplied from the discharge port 40 of the compression mechanism 3 to the first heat transfer body 51a, the heat pipe 46, and the second heat transfer body 51b. Moving the heat. Therefore, the refrigerant discharged from the compression mechanism 3 flows through the sealed container 21, is heated by the second heat transfer body 51 b, and then is discharged outside the sealed container 21. Therefore, the refrigerant discharged from the sealed container 21 is discharged. The temperature of can be kept high.

  Therefore, the expander-integrated compressor 2 according to Embodiment 1 of the present invention suppresses an increase in the enthalpy of the refrigerant in the expansion mechanism 4 as compared with the conventional expander-integrated compressor. Thus, the expansion energy (Lc) recovered in step 1 can be reduced as compared with the conventional case. On the other hand, since the refrigerant discharged from the compression mechanism 3 flows in the sealed container 21 and is heated by the second heat transfer body 51b, the enthalpy of the refrigerant discharged outside the sealed container 21 is kept high. It is possible. Therefore, a decrease in the heating capacity of the refrigeration cycle apparatus 1 can be suppressed.

(Embodiment 2)
The expander-integrated compressor according to Embodiment 2 of the present invention is obtained by changing the heat exchange promoting unit 53 in the expander-integrated compressor 2 of Embodiment 1. Since parts other than the heat exchange promoting part 53 are the same as those in the first embodiment, their explanation is omitted.

  As shown in FIG. 5 (a), in the expander-integrated compressor 2B according to Embodiment 2 of the present invention, the heat exchange promoting portion 53 includes a heat transfer plate 61 disposed above the compression mechanism 3, A heat transfer rod 62 extending upward from the heat transfer plate 61 through the cover 44 and heat transfer fins 63 provided on the heat transfer rod 62 are provided. In the present embodiment, the heat transfer plate 61 and the heat transfer rod 62 are integrally formed. However, the heat transfer plate 61 and the heat transfer rod 62 may be formed separately and assembled to each other by bonding or the like.

  The heat transfer plate 61 is disposed inside the cover 44 and absorbs heat from the refrigerant discharged from the discharge port 40 of the compression mechanism 3.

  As shown in FIG. 5B, four heat transfer rods 62 are provided. These heat transfer rods 62 are arranged on a circumference centered on the axis of the shaft 6 in a plan view, and are arranged at equal intervals. However, the number of the heat transfer rods 62 is not limited at all. Further, the length and outer diameter of the heat transfer rod 62 are not particularly limited. Any one or more of the plurality of heat transfer rods 62 may be different in length or outer diameter from the other heat transfer rods 62.

  The heat transfer rod 62 is not limited to a columnar shape, and may be an elliptical columnar shape. Further, the heat transfer rod 62 may have a polygonal column shape such as a square column shape. Further, the heat transfer rod 62 is not limited to a solid rod, and may be a hollow rod.

  Although the shape of the heat transfer fin 63 is not limited at all, in the present embodiment, the heat transfer fin 63 is a ring fin. The size and the number of the heat transfer fins 63 are not particularly limited. Of course, different heat transfer fins 63 may be provided for each heat transfer rod 62.

  For the heat transfer plate 61, the heat transfer rod 62, and the heat transfer fin 63, it is preferable to use a material having high thermal conductivity. In the present embodiment, heat transfer plate 61, heat transfer rod 62, and heat transfer fin 63 are made of copper. However, the heat transfer plate 61, the heat transfer rod 62, or the heat transfer fin 63 may be formed of other metals such as aluminum.

  Next, the operation of the heat exchange promoting unit 53 will be described. The heat transfer plate 61 of the heat exchange promoting unit 53 absorbs heat from the refrigerant discharged from the discharge port 40 of the compression mechanism 3. The heat absorbed by the heat transfer plate 61 flows upward through the heat transfer rod 62, and part of the heat is transferred to the heat transfer fins 63. And the heat-transfer rod 62 and the heat-transfer fin 63 discharge | release heat to the refrigerant | coolant which flows around them.

  As described above, in the second embodiment, the heat transfer plate 61 serves as a heat absorption unit that absorbs heat from the refrigerant discharged from the compression mechanism 3, and the heat transfer rod 62 and the heat transfer fins 63 are discharged from the discharge pipe 50. It becomes a heat radiating part which releases heat to the refrigerant. The heat transfer rod 62 also functions as a heat transfer portion that transfers heat from the heat absorption portion to the heat dissipation portion.

  The refrigerant discharged from the discharge port 40 of the compression mechanism 3 is once discharged into the space in the cover 44, cooled by the heat transfer plate 61 of the heat exchange promoting unit 53, and then below the compression mechanism 3 through the discharge path 45. Discharged. The refrigerant discharged to the lower side of the compression mechanism 3 flows around the electric motor 5 and the expansion mechanism 4 and then flows to the upper side of the compression mechanism 3. The refrigerant that has flowed above the compression mechanism 3 flows around the heat transfer rods 62 and the heat transfer fins 63 of the heat exchange promotion unit 53 and is heated by the heat transfer rods 62 and the heat transfer fins 63. The heated refrigerant is discharged to the outside of the sealed container 21 through the discharge pipe 50.

  Therefore, also in the present embodiment, the same effect as in the first embodiment can be obtained. That is, also in the present embodiment, since the temperature of the refrigerant flowing in the sealed container 21 is lowered, heat transfer between the expansion mechanism 4 and the flowing refrigerant can be suppressed. Therefore, the increase in the enthalpy of the refrigerant in the expansion mechanism 4 can be suppressed, and the expansion energy recovered by the expansion mechanism 4 can be reduced as compared with the conventional case. Also in the present embodiment, the refrigerant that has flowed through the sealed container 21 can be heated before being discharged from the discharge pipe 50. Therefore, the temperature of the refrigerant discharged to the outside of the sealed container 21 can be kept high, and the enthalpy can be kept high. As a result, a decrease in the heating capacity of the refrigeration cycle apparatus 1 can be suppressed.

  In the present embodiment, the heat transfer fins 63 can be omitted. A plurality of heat transfer pins may be provided instead of the heat transfer rod 62, and these heat transfer pins may be used as so-called pin fins. Further, instead of the heat transfer rod 62, heat transfer fins penetrating the cover 44 may be raised from the heat transfer plate 61.

(Embodiment 3)
The expander-integrated compressor according to Embodiment 3 of the present invention is obtained by changing the heat exchange promoting unit 53 in the expander-integrated compressor 2B of Embodiment 2.

  As shown in FIG. 6, in this embodiment, the heat transfer plate 61 (see FIG. 5) is omitted, and the heat transfer rod 62 is formed integrally with the cover 44. Thus, in the expander-integrated compressor 2C according to the third embodiment, the heat exchange promoting unit 53 includes the cover 44, the heat transfer rod 62 and the heat transfer fin 63 that are integrally formed on the outside of the cover 44. And have.

  In the present embodiment, the cover 44 itself forms a heat absorption part that absorbs heat from the refrigerant discharged from the compression mechanism 3. In addition, although the material of the cover 44 may be iron like the past, the material (for example, copper etc.) whose heat conductivity is higher than iron is more preferable. Further, the cover 44 may not be a single object, and may be a combination of a plurality of members. In that case, it is preferable that the part provided with the heat transfer rod 62 in the cover 44 is formed of a material having high thermal conductivity.

  Also in this embodiment, the same effect as that of the above embodiment can be obtained.

  In the present embodiment, the heat transfer rod 62 is formed integrally with the cover 44, but it is of course possible to join the heat transfer rod 62 to the cover 44 by welding or the like. Further, the shape, number, length, and the like of the heat transfer rod 62 are not limited as in the second embodiment. Further, instead of the heat transfer rod 62, heat transfer fins may be provided outside the cover 44.

(Embodiment 4)
By the way, in the above-mentioned embodiment, the “heat exchange promoting part” promotes heat exchange between the refrigerant discharged from the compression mechanism 3 and the refrigerant before being discharged from the discharge pipe 50 more than before. Say part. Conventionally, the cover 44 covering the upper portion of the compression mechanism 3 is formed of iron. Therefore, even in the conventional expander-integrated compressor, a slight heat exchange is performed between the refrigerant discharged from the compression mechanism 3 and the refrigerant before being discharged from the discharge pipe 50 through the cover 44. There is a possibility that. However, the “heat exchange promoting part” in this specification is a part that further promotes heat exchange.

  As shown in FIG. 7, in the expander-integrated compressor 2D according to Embodiment 4 of the present invention, the cover 44 is formed of a material (for example, copper) having a higher thermal conductivity than iron, and the cover 44 itself The heat exchange promoting part is formed. In the present embodiment, the inside of the cover 44 is a heat absorbing part, and the outside of the cover 44 is a heat radiating part.

  From the viewpoint of promoting heat exchange, it is preferable to provide a heat transfer body in addition to the cover 44 as in the above-described embodiment. However, even in this embodiment, the compression mechanism 3 is different from the conventional one. Heat exchange between the discharged refrigerant and the refrigerant before being discharged from the discharge pipe 50 can be promoted. Further, according to the present embodiment, since there are no fins or the like outside the cover 44, the pressure loss of the refrigerant before being discharged from the discharge pipe 50 can be reduced.

  Note that the cover 44 may be a single body, or may be a combination of a plurality of members. It is mainly the upper portion 44 a of the cover 44 that promotes heat exchange between the refrigerant discharged from the compression mechanism 3 and the refrigerant before being discharged from the discharge pipe 50. Therefore, the upper portion 44a of the cover 44 may be formed of a material having a higher thermal conductivity than iron, and the other portions may be formed of other materials.

  Since the expander-integrated compressor of the present invention has the heat exchange promoting portion, the refrigerant temperature in the sealed container can be controlled, and the heating capacity of the refrigeration cycle apparatus can be improved. In particular, it has a great utility value for realizing high efficiency of a heat pump using an expander-integrated compressor.

The longitudinal cross-sectional view of the expander integrated compressor in Embodiment 1 of this invention Schematic which shows the refrigerating-cycle apparatus in Embodiment 1 of this invention. (A) is a longitudinal cross-sectional view of the heat exchange promoting part of FIG. Mollier diagram in a refrigeration cycle system using an expander-integrated compressor (A) is a longitudinal cross-sectional view of the heat exchange promotion part of the expander integrated compressor in Embodiment 2 of this invention, (b) is a cross-sectional view of the heat exchange promotion part. The longitudinal cross-sectional view of the heat exchange promotion part of the expander integrated compressor which concerns on Embodiment 3 of this invention The longitudinal cross-sectional view of the heat exchange promotion part of the expander integrated compressor which concerns on Embodiment 4 of this invention Vertical section of a conventional expander-integrated compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigeration cycle apparatus 2, 2B, 100 Expander integrated compressor 3 Compression mechanism 4 Expansion mechanism 4a 1st expansion part 4b 2nd expansion part 5 Electric motor 5a Rotor 5b Stator 6 Shaft 7 Evaporator 8 Radiator 21 Sealing container 22a Spring of the first expansion part 22b Spring of the second expansion part 23 Oil reservoir 24a Cylinder of the first expansion part 24b Cylinder of the second expansion part 25a Piston of the first expansion part 25b Piston of the second expansion part 26a First expansion Chamber 26b Second expansion chamber 27a Vane of first expansion portion 27b Vane of second expansion portion 28a First eccentric portion 28b Second eccentric portion 29 Oil pump 30 Partition plate 31 Lower bearing 32 Upper bearing 33 Discharge passage 34 Suction passage 35 Fixed Scroll 36 Movable scroll 37 Bearing 38 Fixed scroll wrap 39 Movable scroll wrap 40 Discharge port 41 Pressure Suction pipe chamber 42 eccentric portion 43 Oldham ring 44 cover 45 discharge passage 46 heat pipe 47 expansion mechanism (second pipe)
48 Discharge pipe of the expansion mechanism (third pipe)
49 Compressor suction pipe (fourth pipe)
50 Discharge pipe of the compression mechanism (first pipe)
51a 1st heat transfer body 51b 2nd heat transfer body 53 Heat exchange promotion part 58 Oil supply path 59 Communication hole 101 Expansion mechanism 102 Electric motor 103 Compression mechanism 104 Casing 105 Drive shaft 106 Suction port 107 Discharge port 108 Inflow port 109 Outflow port 110 Oil supply Passage 111 Oil pump

Claims (12)

A compression mechanism for compressing the refrigerant;
An electric motor for driving the compression mechanism;
An expansion mechanism for expanding the refrigerant;
A shaft that connects the compression mechanism, the electric motor, and the expansion mechanism;
An airtight container in which the compression mechanism, the electric motor, the expansion mechanism, and the shaft are accommodated and a space is formed therein, and the refrigerant compressed by the compression mechanism flows through the internal space;
A heat exchange promoting part that promotes heat exchange between the refrigerant before flowing through the internal space of the sealed container and the refrigerant after flowing through the internal space of the closed container;
An expander-integrated compressor equipped with a compressor. A compression mechanism for compressing the refrigerant;
An electric motor for driving the compression mechanism;
An expansion mechanism for expanding the refrigerant;
A shaft that connects the compression mechanism, the electric motor, and the expansion mechanism;
An airtight container in which the compression mechanism, the electric motor, the expansion mechanism, and the shaft are accommodated and a space is formed therein, and the refrigerant compressed by the compression mechanism flows through the internal space;
A discharge pipe for discharging the refrigerant in the internal space of the sealed container to the outside;
A heat exchange promoting part that absorbs heat from the refrigerant discharged from the compression mechanism and releases the heat to the refrigerant before being discharged from the discharge pipe;
An expander-integrated compressor equipped with a compressor.   The expander-integrated compressor according to claim 1, wherein the heat exchange promoting unit is a heat pipe. The heat exchange promoting part is
A first heat transfer body that absorbs heat from the refrigerant discharged from the compression mechanism;
A second heat transfer body that radiates heat to the refrigerant before being discharged from the sealed container;
The first heat transfer body and the second heat transfer body are connected to each other, and a heat conductor that conducts heat from the first heat transfer body to the second heat transfer body is provided. An expander integrated compressor.   The expander-integrated compressor according to claim 4, wherein the heat conductor is a heat pipe. A cover that covers at least a part of the compression mechanism and forms a discharge path that guides the refrigerant discharged from the compression mechanism to the internal space;
The heat exchange accelerating portion includes a heat absorbing portion disposed inside the cover, a heat radiating portion disposed outside the cover, and a heat transfer portion that penetrates the cover and connects the heat absorbing portion and the heat radiating portion. The expander-integrated compressor according to any one of claims 1 to 5. A cover that covers at least a part of the compression mechanism and forms a discharge path that guides the refrigerant discharged from the compression mechanism to the internal space;
The heat exchange accelerating portion is a heat transfer plate disposed on the inner side of the cover, joined to the heat transfer plate or integrally formed with the heat transfer plate, and penetrates the cover to the outside of the cover. The expander-integrated compressor according to claim 1, further comprising a heat transfer body extending. A cover that covers at least a part of the compression mechanism, forms a discharge path that guides the refrigerant discharged from the compression mechanism to the internal space, and absorbs heat from the refrigerant discharged from the compression mechanism;
The expander according to claim 1 or 2, wherein the heat exchange promoting unit includes the cover and a heat transfer body that is joined to the outside of the cover or integrally formed on the outside of the cover. Integrated compressor. A cover that covers at least a part of the compression mechanism and forms a discharge path that guides the refrigerant discharged from the compression mechanism to the internal space;
3. The expander-integrated compressor according to claim 1, wherein at least a part of the cover is made of a material having a higher thermal conductivity than iron and forms the heat exchange promoting portion. The compression mechanism is disposed above the expansion mechanism,
The expander-integrated compressor according to claim 2, wherein the discharge pipe is connected to a portion of the sealed container that is above the compression mechanism. A cover that covers the upper side of the compression mechanism and at least a part of the side and forms a discharge path that guides the refrigerant discharged from the compression mechanism downward toward the internal space;
The heat exchange promoting portion includes a heat absorbing portion disposed inside the cover, a heat radiating portion disposed between the cover and the discharge pipe, the heat penetrating portion, and the heat absorbing portion and the heat radiating portion. The expander-integrated compressor according to claim 10, further comprising a heat transfer section that connects the two. A refrigeration cycle apparatus comprising the expander-integrated compressor according to any one of claims 1 to 11,
A first pipe for circulating the refrigerant compressed by the compression mechanism and discharged from the sealed container;
A radiator that dissipates the refrigerant after flowing through the first pipe;
A second pipe for supplying the refrigerant flowing out of the radiator toward the expansion mechanism;
A third pipe that expands in the expansion mechanism and distributes the refrigerant discharged from the sealed container;
An evaporator for evaporating the refrigerant after flowing through the third pipe;
A fourth pipe for supplying the refrigerant evaporated in the evaporator toward the compression mechanism;
A refrigeration cycle apparatus comprising:

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