JP2008215212A - Expander-integrated compressor and refrigeration cycle apparatus - Google Patents

Abstract

In an expander-integrated compressor, heat transfer from a compression mechanism to an expansion mechanism is suppressed.
An expander-integrated compressor 200A is disposed between a compression mechanism 2, an expansion mechanism 3, a shaft 5 connecting the compression mechanism 2 and the expansion mechanism 3, and the compression mechanism 2 and the expansion mechanism 3. The oil pump 6 is provided. A partition member 31 that partitions the oil reservoir 25 into an upper pool 25a and lower pools 25b and 25c is disposed below the oil pump 6. The expansion mechanism 3 is accommodated in a capsule 83 that partitions the lower pools 25b and 25c into a lower first pool 25b around the expansion mechanism 3 and a lower second pool 25c around itself. Oil distribution between the upper pool 25a and the lower first pool 25b is allowed by the oil amount adjusting passage 80.
[Selection] Figure 1

Description

  The present invention relates to an expander-integrated compressor including a compression mechanism that compresses fluid and an expansion mechanism that expands fluid, and a refrigeration cycle apparatus including the same.

  Conventionally, an expander-integrated compressor has been known as a fluid machine including a compression mechanism and an expansion mechanism. FIG. 9 is a longitudinal sectional view of the expander-integrated compressor described in Patent Document 1.

  The expander-integrated compressor 103 includes a sealed container 120, a compression mechanism 121, an electric motor 122, and an expansion mechanism 123. The electric motor 122, the compression mechanism 121 and the expansion mechanism 123 are connected by a shaft 124. The expansion mechanism 123 recovers power from the expanding working fluid (for example, refrigerant), and applies the recovered power to the shaft 124. Thereby, the power consumption of the electric motor 122 that drives the compression mechanism 121 is reduced, and the coefficient of performance of the system using the expander-integrated compressor 103 is improved.

  The bottom 125 of the sealed container 120 is used as an oil reservoir. An oil pump 126 is provided at the lower end of the shaft 124 in order to pump the oil stored in the bottom portion 125 upward of the sealed container 120. The oil pumped up by the oil pump 126 is supplied to the compression mechanism 121 and the expansion mechanism 123 via the oil supply passage 127 in the shaft 124. Thereby, the lubricity and the sealing performance at the sliding portion of the compression mechanism 121 and the sliding portion of the expansion mechanism 123 can be ensured.

  An oil return path 128 is provided in the upper part of the expansion mechanism 123. One end of the oil return path 128 is connected to the oil supply path 127 of the shaft 124, and the other end is opened downward of the expansion mechanism 123. Generally, oil is supplied excessively to ensure the reliability of the expansion mechanism 123. Excess oil is discharged below the expansion mechanism 123 via the oil return pipe 128.

The amount of oil mixed in the working fluid that goes out of the sealed container 120 is usually different between the compression mechanism 121 and the expansion mechanism 123. Therefore, when the compression mechanism 121 and the expansion mechanism 123 are housed in separate sealed containers, means for adjusting the oil amounts in the two sealed containers so that the oil amount does not become excessive or insufficient. Is essential. On the other hand, since the compression mechanism 121 and the expansion mechanism 123 are housed in the same sealed container 120 and the oil reservoir is shared, the expander-integrated compressor 103 shown in FIG. There is essentially no shortage problem.
JP 2005-299632 A

  In the above-described expander-integrated compressor 103, the oil pumped up from the bottom 125 passes through the high-temperature compression mechanism 121 and is heated by the compression mechanism 121. The oil heated by the compression mechanism 121 is further heated by the electric motor 122 and reaches the expansion mechanism 123. The oil that has reached the expansion mechanism 123 is cooled by the low-temperature expansion mechanism 123, and then discharged to the lower side of the expansion mechanism 123 via the oil return pipe 128. The oil discharged from the expansion mechanism 123 is heated when passing through the side surface of the electric motor 122, and further heated when passing through the side surface of the compression mechanism 121, and returns to the bottom portion 125 of the sealed container 120.

  As described above, when oil circulates through the compression mechanism and the expansion mechanism, heat transfer from the compression mechanism to the expansion mechanism occurs via the oil. Such heat transfer leads to a decrease in the temperature of the working fluid discharged from the compression mechanism and an increase in the temperature of the working fluid discharged from the expansion mechanism, thereby improving the coefficient of performance of the system using the expander-integrated compressor. Hinder.

  The present invention has been made in view of this point, and an object of the present invention is to suppress heat transfer from the compression mechanism to the expansion mechanism in the expander-integrated compressor.

That is, the present invention
A sealed container whose bottom is used as an oil reservoir and whose internal space is filled with a compressed high-pressure working fluid;
A compression mechanism that is disposed in the upper part of the sealed container and compresses the working fluid and discharges the compressed fluid into the inner space of the sealed container;
An expansion mechanism that is disposed in the lower part of the sealed container and recovers power from the expanding working fluid;
A shaft that connects the compression mechanism and the expansion mechanism so that the power recovered by the expansion mechanism is transmitted to the compression mechanism;
An oil pump disposed between the compression mechanism and the expansion mechanism in the axial direction of the shaft, and supplying oil stored in the oil reservoir to the compression mechanism;
A first partition member that divides the oil reservoir into an upper pool that stores oil to be sucked by the oil pump and a lower pool in which the expansion mechanism is disposed;
The lower pool is divided into a lower first pool for storing oil to be supplied to the expansion mechanism, and a lower second pool isolated from both the upper pool and the lower first pool, and the lower first pool around the expansion mechanism And a second partition member that surrounds the expansion mechanism such that a lower second pool is formed around itself,
Oil with one end connected to the upper pool and the other end connected to the lower first pool so that the oil flow between the upper pool and the lower first pool is allowed to bypass the lower second pool A quantity adjustment passage,
An expander-integrated compressor comprising:

In another aspect, the present invention provides:
A sealed container whose bottom is used as an oil reservoir and whose internal space is filled with a compressed high-pressure working fluid;
A compression mechanism that is disposed in the upper part of the sealed container and compresses the working fluid and discharges the compressed fluid into the inner space of the sealed container;
An expansion mechanism that is disposed in the lower part of the sealed container and recovers power from the expanding working fluid;
A shaft that connects the compression mechanism and the expansion mechanism so that the power recovered by the expansion mechanism is transmitted to the compression mechanism;
An oil pump disposed between the compression mechanism and the expansion mechanism in the axial direction of the shaft, and supplying oil stored in the oil reservoir to the compression mechanism;
A first partition member that partitions the oil reservoir into an upper pool that stores oil to be supplied to the compression mechanism and a lower pool in which the expansion mechanism is disposed;
A lower first pool that is disposed in the lower pool and surrounds the expansion mechanism to store oil to be supplied to the expansion mechanism; and an oil distribution path that moves from the upper pool to the lower first pool or vice versa. A second partition member that forms a lower second pool comprising:
A first oil amount adjusting passage that allows oil to flow between the upper pool and the lower second pool;
A second oil amount adjusting passage that allows oil to flow between the lower first pool and the lower second pool;
An expander-integrated compressor comprising:

  The expander-integrated compressor of the present invention employs a so-called high-pressure shell type in which a hermetic container is filled with a high-temperature and high-pressure working fluid. A compression mechanism that is hot during operation is disposed in the upper part of the sealed container, and an expansion mechanism that is cold during operation is disposed in the lower part. In addition, oil for lubricating the compression mechanism and the expansion mechanism is stored in the lower part (bottom part) of the sealed container.

  In the former of the expander-integrated compressor of the present invention, the space in which oil is stored (oil storage) is partitioned into an upper pool and a lower pool by a first partition member. The lower pool is further partitioned into a lower first pool around the expansion mechanism and a lower second pool around the second partition member surrounding the expansion mechanism. By the first partition member and the second partition member, the lower second pool becomes a space isolated from both the upper pool and the lower first pool. The first partition member substantially prohibits oil from flowing between the upper pool and the lower second pool. The second partition member substantially prohibits oil from flowing between the lower first pool and the lower second pool. Therefore, the oil stored in the lower second pool functions as a heat insulating material, and heat transfer from the compression mechanism to the expansion mechanism via the oil is suppressed. Moreover, since the stirring of the oil in the lower first pool and the lower second pool is suppressed by the first partition member and the second partition member, high temperature oil is stored in the upper pool, and the lower first pool and the lower second pool. Thus, it is possible to reliably maintain a state where low temperature oil is stored.

  On the other hand, the oil pump sucks hot oil in the upper pool. The oil sucked into the oil pump is supplied to the upper compression mechanism without passing through the lower expansion mechanism, and then returns to the upper pool. The expansion mechanism is supplied with low temperature oil from the lower first pool. Oil overflowing from the expansion mechanism is returned directly to the lower first pool. In this way, by disposing an oil pump between the compression mechanism and the expansion mechanism and supplying oil to the compression mechanism using the oil pump, the oil circulation path that lubricates the compression mechanism is kept away from the expansion mechanism. Can do. In other words, the expansion mechanism can be prevented from being positioned on the circulation path of the oil that lubricates the compression mechanism. Thereby, the heat transfer from the compression mechanism to the expansion mechanism via the oil is suppressed.

  Thus, combined with the effects of the oil pump, the first partition member, and the second partition member, the heat transfer from the compression mechanism to the expansion mechanism via the oil is further suppressed. Further, since the oil amount adjusting passage is provided, oil can be replenished between the upper pool and the lower first pool.

  In the latter of the expander-integrated compressors of the present invention, a space in which oil is stored (oil storage) is partitioned into an upper pool and a lower pool by a first partition member. The lower pool is further partitioned into a lower first pool around the expansion mechanism and a lower second pool around the second partition member surrounding the expansion mechanism. Oil can move from the upper pool to the lower first pool or vice versa by way of the first oil amount adjusting passage and the second oil amount adjusting passage via the lower second pool. This lower second pool serves as a buffer area for buffering the flow of oil moving from the upper pool to the lower first pool or vice versa. That is, the oil stored in the lower second pool functions as a heat insulating material, and heat transfer from the compression mechanism to the expansion mechanism via the oil is suppressed. Moreover, since the stirring of the oil in the lower first pool and the lower second pool is suppressed by the first partition member and the second partition member, high temperature oil is stored in the upper pool, and the lower first pool and the lower second pool. Thus, it is possible to reliably maintain a state where low temperature oil is stored.

  Further, the effect of suppressing the heat transfer by the oil pump is as described above, and the effects of the oil pump, the first partition member, and the second partition member are combined, so that the compression mechanism through the oil and the expansion mechanism are combined. The heat transfer to is further suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view of an expander-integrated compressor according to a first embodiment of the present invention. 2A is a D1-D1 cross-sectional view of the expander-integrated compressor shown in FIG. 2B is a D2-D2 cross-sectional view of the expander-integrated compressor shown in FIG. FIG. 3 is a partially enlarged view of FIG.

  As shown in FIG. 1, the expander-integrated compressor 200 </ b> A includes a sealed container 1, a scroll-type compression mechanism 2 disposed at the upper part in the sealed container 1, and 2 disposed at the lower part in the sealed container 1. A stage rotary type expansion mechanism 3, an electric motor 4 disposed between the compression mechanism 2 and the expansion mechanism 3, a shaft 5 connecting the compression mechanism 2, the expansion mechanism 3 and the electric motor 4, and the electric motor 4 and the expansion mechanism 3 And an oil pump 6 disposed between the two. When the electric motor 4 drives the shaft 5, the compression mechanism 2 operates. The expansion mechanism 3 collects power from the expanding working fluid and applies it to the shaft 5 to assist the drive of the shaft 5 by the electric motor 4. The working fluid is a refrigerant such as carbon dioxide or hydrofluorocarbon.

  The expander-integrated compressor 200A further partitions the inside of the hermetic container 1 into a first side where the compression mechanism 2, the electric motor 4 and the oil pump 6 are arranged and a second side where the expansion mechanism 3 is arranged. 31, a capsule 83 that surrounds the expansion mechanism 3 on the second side inside the sealed container 1, and an oil amount adjusting passage 80 that connects the first side inside the sealed container 1 and the inside of the capsule 83. Yes.

  In this specification, the axial direction of the shaft 5 is defined as the vertical direction, the side on which the compression mechanism 2 is disposed is the upper side (first side), and the side on which the expansion mechanism 3 is disposed is the lower side (second side). Side). Further, in the present embodiment, the scroll type compression mechanism 2 and the rotary type expansion mechanism 3 are adopted, but the types of the compression mechanism 2 and the expansion mechanism 3 are not limited to these, and other volume types are used. Also good. For example, both the compression mechanism and the expansion mechanism can be a rotary type or a scroll type.

  As shown in FIG. 1, the lower part (bottom part) of the sealed container 1 is used as an oil reservoir 25. Oil is used to ensure lubricity and sealing performance at the sliding portions of the compression mechanism 2 and the expansion mechanism 3. The amount of oil stored in the oil reservoir 25 is the same as that of the oil pump 6 in a state where the sealed container 1 is erected, that is, in a state where the attitude of the sealed container 1 is determined so that the axial direction of the shaft 5 is parallel to the vertical direction. The oil level SL (see FIG. 3) is adjusted so as to be positioned above the oil suction port 62q and below the electric motor 4.

  The oil reservoir 25 includes an upper pool 25a that stores oil sucked from the oil suction port 62q by the oil pump 6, and lower pools 25b and 25c in which the expansion mechanism 3 is disposed. The upper pool 25a and the lower pools 25b and 25c are partitioned by a partition member 31 (first partition member). The lower pool 25c further includes a lower first pool 25b for storing oil to be supplied to the expansion mechanism 3 by a capsule 83 as a second partition member, and a lower second pool isolated from the upper pool 25a and the lower first pool 25b. It is partitioned into a pool 25c. The periphery of the oil pump 6 is filled with the oil of the upper pool 25a, the periphery of the expansion mechanism 3 is filled with the oil of the lower first pool 25b, and the periphery of the capsule 83 is filled with the oil of the lower second pool 25c. The oil in the upper pool 25a is mainly used for the compression mechanism 2, and the oil in the lower first pool 25b is mainly used for the expansion mechanism 3. The oil in the lower second pool 25c has a very small flow and itself functions as a heat insulating material, and heat from the portion above the partition member 31 inside the sealed container 1 to the portion below the partition member 31 The movement, in other words, the heat transfer from the compression mechanism 2 to the expansion mechanism 3 is suppressed.

  The oil pump 6 is disposed between the compression mechanism 2 and the expansion mechanism 3 in the axial direction of the shaft 5 so that the oil level SL of the oil stored in the upper pool 25a is positioned above the oil suction port 62q. ing. Oil in the upper pool 25 a is sucked into the oil pump 6 and supplied to the sliding portion of the compression mechanism 2. The oil that returns to the upper pool 25a after lubrication of the compression mechanism 2 is subjected to a heating action from the compression mechanism 2 and the electric motor 4, and therefore has a relatively high temperature. The oil that has returned to the upper pool 25a is again sucked into the oil pump 6.

  On the other hand, the oil of the lower first pool 25b is supplied to the sliding portion of the expansion mechanism 3. Oil overflowing from the sliding portion of the expansion mechanism 3 is returned directly to the lower first pool 25b. Since the oil stored in the lower first pool 25b is cooled by the expansion mechanism 3, the oil becomes relatively low in temperature. An oil pump 6 is disposed between the compression mechanism 2 and the expansion mechanism 3, and the oil pump 6 is used to supply oil to the compression mechanism 2, thereby expanding a high-temperature oil circulation path that lubricates the compression mechanism 2. It can be moved away from the mechanism 3. In other words, it is possible to separate a high-temperature oil circulation path for lubricating the compression mechanism 2 and a low-temperature oil circulation path for lubricating the expansion mechanism 3. Thereby, the heat transfer from the compression mechanism 2 to the expansion mechanism 3 via oil is suppressed.

  Since the partition member 31 and the capsule 83 increase the axial distance between the oil pump 6 and the expansion mechanism 3, this also causes the heat from the oil stored in the upper pool 25 a to the oil around the expansion mechanism 3. The amount of movement can be reduced.

  Next, the compression mechanism 2 and the expansion mechanism 3 will be described.

  The scroll-type compression mechanism 2 includes a turning scroll 7, a fixed scroll 8, an Oldham ring 11, a bearing member 10, a muffler 16, a suction pipe 13, and a discharge pipe 15. The orbiting scroll 7 fitted to the eccentric shaft 5a of the shaft 5 and constrained to rotate by the Oldham ring 11 rotates the shaft 5 while the spiral wrap 7a meshes with the wrap 8a of the fixed scroll 8. Along with this, the crescent-shaped working chamber 12 formed between the wraps 7a and 8a reduces the volume while moving from the outside to the inside, thereby compressing the working fluid sucked from the suction pipe 13. . The compressed working fluid is hermetically sealed through the discharge hole 8b provided in the center of the fixed scroll 8, the internal space 16a of the muffler 16, and the flow path 17 passing through the fixed scroll 8 and the bearing member 10 in this order. It is discharged into the internal space 24 of the container 1. The oil that has reached the compression mechanism 2 through the oil supply passage 29 of the shaft 5 lubricates the sliding surface between the orbiting scroll 7 and the eccentric shaft 5 a and the sliding surface between the orbiting scroll 7 and the fixed scroll 8. The working fluid discharged into the internal space 24 of the sealed container 1 is separated from oil by gravity or centrifugal force while staying in the internal space 24, and then discharged from the discharge pipe 15 toward the gas cooler.

  The electric motor 4 that drives the compression mechanism 2 via the shaft 5 includes a stator 21 fixed to the hermetic container 1 and a rotor 22 fixed to the shaft 5. Electric power is supplied to the electric motor 4 from a terminal (not shown) arranged at the upper part of the hermetic container 1. The electric motor 4 may be either a synchronous machine or an induction machine, and is cooled by the working fluid discharged from the compression mechanism 2 and oil mixed in the working fluid.

  Inside the shaft 5, an oil supply passage 29 communicating with the sliding portion of the compression mechanism 2 is formed so as to extend in the axial direction, and oil discharged from the oil pump 6 is fed into the oil supply passage 29. The oil sent to the oil supply passage 29 is supplied to each sliding portion of the compression mechanism 2 without going through the expansion mechanism 3. In this way, since the oil heading toward the compression mechanism 2 is not cooled by the expansion mechanism 3, heat transfer from the compression mechanism 2 to the expansion mechanism 3 via the oil can be effectively suppressed. In addition, if the oil supply passage 29 is formed inside the shaft 5, it is preferable because an increase in the number of parts and a problem of layout do not newly occur.

  Further, in the present embodiment, the shaft 5 includes a first shaft 5s positioned on the compression mechanism 2 side and a second shaft 5t connected to the first shaft 5s and positioned on the expansion mechanism 3 side. Inside the first shaft 5s, an oil supply passage 29 communicating with the sliding portion of the compression mechanism 2 is formed so as to extend in the axial direction. The oil supply passage 29 is exposed at the lower end surface and the upper end surface of the first shaft 5s. The first shaft 5s and the second shaft 5t are coupled by a coupler 63 so that the power recovered by the expansion mechanism 3 is transmitted to the compression mechanism 2. However, the first shaft 5s and the second shaft 5t may be directly fitted together without using the coupler 63. It is also possible to use a shaft made of a single part.

  The expansion mechanism 3 includes a first cylinder 42, a second cylinder 44 that is thicker than the first cylinder 42, and an intermediate plate 43 that partitions the cylinders 42 and 44. The first cylinder 42 and the second cylinder 44 are arranged concentrically with each other. The expansion mechanism 3 is further fitted to the eccentric portion 5c of the shaft 5 and reciprocates in the first piston 46 that rotates eccentrically in the first cylinder 42 and the vane groove 42a (see FIG. 2A) of the first cylinder 42. A first vane 48 that is held movably and has one end in contact with the first piston 46 and a second vane 48 in contact with the other end of the first vane 48 and biases the first vane 48 toward the first piston 46. 1 The spring 50 and the eccentric portion 5d of the shaft 5 are fitted, and the second piston 47 that rotates eccentrically in the second cylinder 44 and the vane groove 44a (see FIG. 2B) of the second cylinder 44 can reciprocate freely. The second vane 49 with one end contacting the second piston 47 and the second spring contacting the other end of the second vane 49 and biasing the second vane 49 toward the second piston 47. 51.

  The expansion mechanism 3 further includes an upper bearing member 45 and a lower bearing member 41 that are disposed so as to sandwich the first cylinder 42, the second cylinder 44, and the intermediate plate 43. The lower bearing member 41 and the middle plate 43 sandwich the first cylinder 42 from above and below, and the middle plate 43 and the upper bearing member 45 sandwich the second cylinder 44 from above and below. By holding the upper bearing member 45, the intermediate plate 43 and the lower bearing member 41, a working chamber whose volume changes according to the rotation of the pistons 46 and 47 is formed in the first cylinder 42 and the second cylinder 44. . The upper bearing member 45 and the lower bearing member 41 also function as bearing members that hold the shaft 5 rotatably. The expansion mechanism 3 also includes a suction pipe 52 and a discharge pipe 53, as with the compression mechanism 2.

  As shown in FIG. 2A, on the inner side of the first cylinder 42, a suction-side working chamber 55a (first suction-side space) and a discharge-side working chamber 55b defined by a first piston 46 and a first vane 48 are provided. (First discharge side space) is formed. As shown in FIG. 2B, on the inner side of the second cylinder 44, a suction-side working chamber 56a (second suction-side space) and a discharge-side working chamber 56b defined by a second piston 47 and a second vane 49 are provided. (Second discharge side space) is formed. The total volume of the two working chambers 56 a and 56 b in the second cylinder 44 is larger than the total volume of the two working chambers 55 a and 55 b in the first cylinder 42. The discharge-side working chamber 55b of the first cylinder 42 and the suction-side working chamber 56a of the second cylinder 44 are connected by a through hole 43a provided in the intermediate plate 43, and one working chamber (expansion chamber) is connected. ). The high-pressure working fluid flows into the working chamber 55 a of the first cylinder 42 from the suction hole 41 a provided in the lower bearing member 41. The working fluid that has flowed into the working chamber 55a of the first cylinder 42 expands to a low pressure while rotating the shaft 5 in the expansion chamber composed of the working chamber 55b and the working chamber 56a. The low-pressure working fluid is discharged from a discharge hole 45 a provided in the upper bearing member 45.

  As described above, the expansion mechanism 3 closes the cylinders 42 and 44, the pistons 46 and 47 disposed in the cylinders 42 and 44 so as to be fitted to the eccentric portions 5c and 5d of the shaft 5, and the cylinders 42 and 44. The rotary type includes bearing members 41 and 45 (blocking members) that form expansion chambers together with the cylinders 42 and 44 and the pistons 46 and 47. In the rotary type fluid mechanism, lubrication of a vane that divides a space in a cylinder into two is indispensable. When the entire mechanism is immersed in oil, the vane can be lubricated by a very simple method in which the rear end of the vane groove in which the vane is disposed is exposed in the sealed container 1. Also in the present embodiment, the vanes 48 and 49 are lubricated by such a method.

  As shown in FIG. 5, the oil supply to the other parts (for example, the bearing members 41 and 45) is performed, for example, so as to extend from the lower end of the second shaft 5t toward the cylinders 42 and 44 of the expansion mechanism 3. This can be done by forming the groove 5k on the outer peripheral surface of 5t. The pressure applied to the oil stored in the oil reservoir 25 is larger than the pressure applied to the oil being lubricated to the cylinders 42 and 44 and the pistons 46 and 47. Therefore, the oil can be supplied to the sliding portion of the expansion mechanism 3 through the groove 5k on the outer peripheral surface of the second shaft 5t without the assistance of the oil pump. Furthermore, an oil supply path may be provided inside the second shaft 5t, and an oil pump may be installed at the lower end of the second shaft 5t to supply oil to the sliding portion of the expansion mechanism 3.

  Next, the oil pump 6 will be described in detail.

  As shown in FIG. 3A, the oil pump 6 includes a pump body 60 configured to pump oil by increasing or decreasing the volume of the working chamber accompanying the rotation of the shaft 5, and the oil discharged from the pump body 60 temporarily. And a hollow relay member 71 accommodated in the housing. The shaft 5 is passed through the center of the oil pump 6 so as to penetrate the pump body 60 and the relay member 71. The oil is fed into the oil supply passage 29 when the inlet to the oil supply passage 29 faces the internal space 70 h of the relay member 71. In this way, oil can be fed into the oil supply passage 29 without leakage without providing a separate oil supply pipe.

  FIG. 4 shows a plan view of the pump body 60. The pump main body 60 includes a piston 61 attached to an eccentric portion of the shaft 5 (second shaft 5t), and a housing 62 (cylinder) that accommodates the piston 61. A crescent-shaped working chamber 64 is formed between the piston 61 and the housing 62. That is, the pump body 60 employs a rotary fluid mechanism. The housing 62 includes an oil suction passage 62 a that connects the oil reservoir 25 (specifically, the upper pool 25 a) and the working chamber 64, and an oil discharge passage 62 b that connects the working chamber 64 and the internal space 70 h of the relay member 71. And are provided. As the second shaft 5t rotates, the piston 61 moves eccentrically in the housing 62. As a result, the volume of the working chamber 64 is increased or decreased, and oil is sucked and discharged. Such a mechanism is advantageous in that the mechanical loss is small because the rotational movement of the second shaft 5t is directly used for the oil-feeding movement without being converted into another movement by a cam mechanism or the like. Further, since it has a relatively simple structure, it has high reliability.

  As shown in FIG. 3A, the pump body 60 and the relay member 71 are arranged adjacent to each other in the axial direction so that the upper surface of the housing 62 of the pump body 60 and the lower surface of the relay member 71 are in contact with each other. The relay member 71 is closed by the upper surface of the housing 62. Further, the relay member 71 has a bearing portion 76 that supports the shaft 5 (first shaft 5s). In other words, the relay member 71 also has a function of a bearing that supports the shaft 5. The oil supply passage 29 of the shaft 5 is branched in a section corresponding to the bearing portion 76 so that the bearing portion 76 can be lubricated.

  In addition, in the internal space 70h of the relay member 71, a connecting portion between the first shaft 5s and the second shaft 5t is formed. Thus, the oil discharged from the pump main body 60 can be easily fed into the oil supply passage 29 formed inside the first shaft 5s.

  Furthermore, in the present embodiment, the first shaft 5 s and the second shaft 5 t are connected by the coupler 63, and the coupler 63 is disposed in the internal space 70 h of the relay member 71. That is, the relay member 71 plays a role of relaying between the pump body 60 and the oil supply passage 29 and a role of providing an installation space for the coupler 63. For example, the first shaft 5s and the coupler 63 are synchronously rotated by engaging a groove provided on the outer peripheral surface of the first shaft 5s with a groove provided on the inner peripheral surface of the coupler 63. Are linked together. The second shaft 5t and the coupler 63 can be fixed in the same manner. The coupler 63 rotates in synchronization with the first shaft 5s and the second shaft 5t in the relay member 71. Torque applied to the second shaft 5t by the expansion mechanism 3 is transmitted to the first shaft 5s via the coupler 63.

  The coupler 63 is provided with an oil delivery path 63 a that can connect the internal space 70 h of the relay member 71 and the oil supply path 29 of the shaft 5 so as to extend from the outer peripheral surface toward the rotation center of the shaft 5. . The oil sent from the pump main body 60 to the relay member 71 through the oil discharge passage 62 b flows through the oil delivery passage 63 a of the coupler 63 and is sent to the oil supply passage 29 of the shaft 5.

  The oil supply passage 29 is exposed at the lower end surface of the first shaft 5s. The coupler 63 couples the first shaft 5s and the second shaft 5t with a gap 78 formed between the first shaft 5s and the second shaft 5t. An oil delivery path 63a is connected to the gap 78. With such a structure, even when the coupler 63 rotates together with the shafts 5s and 5t, the oil discharged from the pump body 60 is sent to the oil supply passage 29 without interruption, so that the sliding portion of the compression mechanism 2 can be stabilized. It becomes possible to lubricate.

  Furthermore, according to this embodiment, the following effects are also obtained. The conventional expander-integrated compressor (see FIG. 9) has a structure in which oil is pumped from the lower end of the shaft. Therefore, when two shafts are connected and used, the connecting portion is inevitably located in the middle of the oil supply path, and oil leakage may occur from the connecting portion. On the other hand, if the connection part of the 1st shaft 5s and the 2nd shaft 5t is utilized as an inlet_port | entrance to the oil supply path 29 like this embodiment, the problem of the oil leak in a connection part does not exist essentially. It will be.

  Next, the partition member 31 and the capsule 83 will be described in detail.

  As described above, the effect of suppressing the heat transfer from the compression mechanism 2 to the expansion mechanism 3 can be obtained only by the oil pump 6 disposed between the compression mechanism 2 and the expansion mechanism 3. By enclosing 3 with the capsule 83 to form the lower second pool 25c, the effect can be greatly enhanced.

  During the operation of the expander-integrated compressor 200A, the oil is relatively hot in the upper pool 25a, and is relatively cool in the lower pools 25b and 25c, particularly the lower first pool 25b around the expansion mechanism 3. . Oil distribution between the upper pool 25a and the lower second pool 25c is substantially prohibited. Further, oil circulation between the lower first pool 25b and the lower second pool is substantially prohibited. The oil stored in the lower second pool 25c hardly flows and itself functions as a heat insulating material.

  Here, “the oil distribution is substantially prohibited” means that the flow path is not intentionally provided, and does not necessarily mean that there is no oil traffic. For example, since the shaft 5 penetrates the partition member 31 and the capsule 83, a gap of a micrometer unit inevitably exists between these members and the shaft 5. Therefore, a small amount of oil moves along the outer peripheral surface of the shaft 5 between the upper pool 25a and the lower second pool 25c, and further between the lower first pool 25b and the lower second pool 25c. Further, although the partition member 31 is fixed to the sealed container 1 by a method such as shrink fitting or press fitting, a minute gap may exist between the sealed container 1 and the partition member 31. Oil may flow between the upper pool 25a and the lower second pool 25c through such a minute gap. Conversely, the presence of such a minute gap facilitates filling of the oil in the lower second pool 25c.

  As shown in FIGS. 1 and 3A, the partition member 31 is disposed adjacent to the oil pump 6. Specifically, the housing 62 is closed by the partition member 31 so that the piston 61 is accommodated in the housing 62 of the pump body 60. However, as shown in FIG. 3B, the partition member 31 can be used as a part of the oil pump 6 by providing the partition member 31 with a shallow countersink 31 g. That is, the partition member 31 may be closed by the housing 62 in which the piston 61 is accommodated in the counterbore 31g and the oil suction path 62a and the oil discharge path 62b are provided. 3A and 3B, the partition member 31 forms the bottom surface of the upper pool 25a, and the space formed between the inner peripheral surface of the sealed container 1 and the outer peripheral surface of the oil pump 6 is the upper pool 25a. As a role.

  The shape of the partition member 31 is a shape along the inner peripheral surface of the sealed container 1, specifically a disc shape, in consideration of fixing to the sealed container 1 by a method such as shrink fitting or press fitting. It is good. However, the partition member 31 may be fixed to the sealed container 1 by welding or brazing. The partition member 31 is provided with a through hole in the center for inserting the shaft 5. Therefore, the partition member 31 may have a function as a bearing that supports the shaft 5. Furthermore, a through hole 31 h that forms part of the oil amount adjusting passage 80 is provided in the outer peripheral portion of the partition member 31.

  As can be understood from FIG. 1 and FIG. 2, the capsule 83 (second partition member) can be a housing having a size that can accommodate the expansion mechanism 3 therein. A through hole for inserting the shaft 5 is provided in the upper portion of the capsule 83. A through hole for inserting the suction pipe 52 and the discharge pipe 53 is provided in the cylindrical side portion of the capsule 83. The suction pipe 52 and the discharge pipe 53 penetrate the capsule 83 and the inside and outside of the sealed container 1. A space surrounded by the inner peripheral surface of the capsule 83 and the outer peripheral surface of the expansion mechanism 3 (the outer peripheral surfaces of the cylinders 42 and 44 and the bearings 41 and 45) serves as the lower first pool 25b. A space surrounded by the lower surface of the partition member 31, the inner peripheral surface of the sealed container 1, and the outer peripheral surface of the capsule 83 serves as the lower second pool 25c. Such a capsule 83 can be fixed to the partition member 31 using a fastener such as a bolt.

  The lower end of the second shaft 5t is exposed to the lower first pool 25b. As described with reference to FIG. 5, the oil filling the lower first pool 25 b is supplied to lubricated components such as the pistons 46 and 47 and the bearing members 41 and 45 along the outer peripheral surface of the second shaft 5 t. When an oil pump is provided at the lower end of the second shaft 5t, the suction port of the oil pump is exposed to the lower first pool 25b. The rear ends of the vanes 50 and 51 are exposed to the lower first pool 25b. Oil filling the lower first pool 25b is supplied to the vane grooves 42a, 44a (see FIG. 2), the vanes 42, 44 are lubricated, and the airtightness of the working chambers 55, 56 is ensured.

  The oil amount adjusting passage 80 allows oil to flow between the upper pool 25a and the lower first pool 25b. The oil moves from the upper pool 25a to the lower first pool 25b or vice versa via the oil amount adjusting passage 80. According to this embodiment, most of the oil mixed in the working fluid in the compression mechanism 2 is separated from the working fluid in the internal space of the sealed container 1 and falls into the upper pool 25a. Therefore, a small amount of oil is contained in the working fluid that goes out of the sealed container 1 from the discharge pipe 15. On the other hand, since there is no trap for separating the oil on the expansion mechanism 3 side, the oil mixed in the working fluid in the expansion mechanism 3 goes out of the sealed container 1 together with the working fluid from the discharge pipe 53. That is, the expansion mechanism 3 consumes oil in the lower first pool 25b. In order to compensate for this consumption, oil moves from the upper pool 25a to the lower first pool 25b. However, since the oil consumption varies depending on the type of the compression mechanism 2 and the expansion mechanism 3, the movement direction of the oil is not limited to the above.

  In the present embodiment, the oil amount adjusting passage 80 is constituted by the two pipes 81 and 82 and the through hole 31 h provided in the partition member 31. One end of each of the two pipes 81 and 82 is inserted into the through-hole 31h in the outer peripheral portion of the partition member 31 from the upper surface side, and the other end extends above the oil suction port 62q of the oil pump 6. And a second pipe 82 having one end inserted into the through hole 31 h in the outer peripheral portion of the partition member 31 from the lower surface side and the other end inserted into the capsule 83. According to the through-hole 31h and the second pipe 82, it is possible to reliably prevent the oil stored in the upper pool 25a and the lower first pool 25b from being mixed with the oil stored in the lower second pool 25c. Further, the oil from the upper pool 25a toward the lower first pool 25b dissipates heat to the oil in the lower second pool 25c while slowly flowing through the second pipe 82. Therefore, relatively low temperature oil can be supplied to the lower first pool 25b.

  The second pipe 82 may be an L-shaped pipe in which a bent portion is included in a portion exposed to the lower second pool 25c. By adopting the L-shaped tube, the oil agitating action of the upper pool 25a becomes difficult to reach the lower first pool 25b.

  On the other hand, by providing the first pipe 81, the following benefits can be obtained. The position of the oil level SL in the upper pool 25a is not always constant, and it may be assumed that the oil level SL temporarily decreases. Even when the position of the oil level SL is lowered, the supply of oil to the compression mechanism 2 must be continued. In the present embodiment, the opening of the first pipe 81 as the inlet of the oil amount adjusting passage 80 on the upper pool 25a side is located above the oil suction port 62q of the oil pump 6. Then, when the position of the oil level SL is lower than the opening of the first pipe 81, the oil movement path to the lower first pool 25b is blocked, and the oil in the upper pool 25a is used only for the oil pump 6. It will be. That is, the oil in the upper pool 25a can be sucked into the oil pump 6 with the highest priority, and improvement in the reliability of the compression mechanism 2 can be expected.

  In addition, the partition member 31 and the capsule 83 may be arranged so that a space SH constituting a part of the lower second pool 25c is formed between the lower surface of the partition member 31 and the upper surface of the capsule 83. preferable. In other words, the relative positional relationship between the partition member 31 and the capsule 83 may be determined so that such a space SH is formed. In this way, since the space SH is filled with oil, it is possible to prevent heat from being directly transferred from the partition member 31 to the capsule 83.

  The oil amount adjusting passage 80 may be configured by a single pipe. That is, a pipe having a shape and dimensions corresponding to the first pipe 81, the through hole 31h, and the second pipe 82 can be employed. Further, the materials of the partition member 31, the capsule 83, and the pipes 81 and 82 are not particularly limited, and the same material as the components of the expansion mechanism 3 and the oil pump 6, for example, a metal such as cast iron or stainless steel is used. it can.

(Second Embodiment)
FIG. 6 is a longitudinal sectional view of the expander-integrated compressor according to the second embodiment. The difference between the first embodiment and this embodiment is the configuration of the oil amount adjusting passage. Other configurations are common as can be understood from the same reference numerals.

  In the expander-integrated compressor 200B of the present embodiment, the oil amount adjusting passage 85 passes through the outside of the hermetic container 1. In this way, heat exchange is performed between the oil that slowly flows through the oil amount adjusting passage 85 and the outside air, and the oil can be cooled efficiently, so that the hot oil is discharged from the upper pool 25a to the expansion mechanism 3. Can be prevented from flowing into the lower first pool 25b.

  The oil amount adjusting passage 85 can be configured by piping. One end of the pipe 85 may be inserted into the sealed container 1 so as to be exposed above the upper surface of the partition member 31, and the other end may be inserted into the sealed container 1 and the capsule 83 so as to penetrate the lower second pool 25c. . In this way, there is no possibility that the oil stored in the upper pool 25a and the lower first pool 25b and the oil stored in the lower second pool 25c are mixed. Further, if the pipe 85 is welded to the sealed container 1, the airtightness is not affected. Furthermore, as described in the first embodiment, the inlet of the oil amount adjusting passage 85 on the upper pool 25a side may be located above the oil suction port 62q of the oil pump 6.

  Moreover, you may make it actively cool the part exposed to the exterior of the airtight container 1 among the piping 85 as an oil quantity adjustment channel | path. For example, it is possible to devise such as attaching a cooling fin to a portion exposed to the outside of the sealed container 1.

(Third embodiment)
FIG. 7 is a longitudinal sectional view of the expander-integrated compressor according to the third embodiment. The point that the capsule 183 (second partition member) surrounding the expansion mechanism 3 is arranged in the lower pools 25b and 25c is the same between the previous two embodiments and the present embodiment. The difference between the previous two embodiments and the present embodiment is that the oil flows between the upper pool 25a and the lower second pool 25c, and the oil between the lower first pool 25b and the lower second pool 25c. It is in the point where distribution of is permitted.

  The capsule 183 accommodates the expansion mechanism 3 in the lower first pool 25b for storing oil to be supplied to the expansion mechanism 3, and the lower first pool 25b from the upper pool 25a or the oil moving in the opposite direction. A lower second pool 25c serving as a distribution path is formed in the lower pool. The lower second pool 25c buffers the flow of oil that moves from the upper pool 25a to the lower first pool 25b or vice versa. Thereby, the heat transfer from the compression mechanism 2 to the expansion mechanism 3 is suppressed.

  Specifically, the first oil amount adjustment passage 87 that allows oil to flow between the upper pool 25a and the lower second pool 25c, and the oil between the lower first pool 25b and the lower second pool 25c. A second oil amount adjusting passage 89 that allows circulation is provided. By these oil amount adjusting passages 87 and 89, the amount of oil contained in the working fluid exiting from the discharge pipe 15 to the outside of the sealed container 1 and the working fluid exiting from the discharge pipe 53 to the outside of the sealed container 1 are converted. It becomes possible to eliminate the difference from the amount of oil contained.

  In the present embodiment, the first oil amount adjusting passage 87 has a through hole 31h provided in the outer peripheral portion of the partition member 31 and one end inserted into the through hole 31h of the partition member 31 from the upper surface side, and the other end is an oil pump. 6 and a pipe 81 extending above the oil suction port 62q. The through hole 31h and the pipe 81 of the partition member 31 are the same as those described in the first embodiment.

  Further, as described in the second embodiment, the first oil amount adjustment passage 87 may pass through the outside of the sealed container 1.

  On the other hand, the second oil amount adjusting passage 89 is configured by a through hole 89 provided at the bottom of the capsule 183. The oil near the bottom of the capsule 183 is relatively cooler than the oil near the partition member 31. Therefore, the through hole 89 at the bottom of the capsule 183 is preferable because low temperature oil is supplied to the sliding portion of the expansion mechanism 3.

  The expander-integrated compressor of the present invention can be suitably used for, for example, a heat pump for an air conditioner, a hot water supply device, a dryer or a refrigerator-freezer. In FIG. 8, the block diagram of the heat pump (refrigeration cycle apparatus) applied to the air conditioning apparatus is shown.

  The heat pump 300 includes an indoor unit 107 having a first heat exchanger 101 and an outdoor unit 102 having an expander-integrated compressor 200A and a second heat exchanger 104. The compression mechanism 2, the first heat exchanger 101, the expansion mechanism 3, and the second heat exchanger 104 are connected by a pipe to form a refrigerant circuit. The expander-integrated compressor 200A may be replaced with another embodiment.

  Four-way valves 105 and 106 are disposed in the refrigerant circuit, and the refrigerant flow direction can be switched. That is, when performing the heating operation, the four-way valves 105 and 106 are set so that the refrigerant radiates heat in the first heat exchanger 101 in the indoor unit 107 and evaporates in the second heat exchanger 104 in the outdoor unit 102. Control. When performing the cooling operation, the four-way valves 105 and 106 are controlled so that the refrigerant radiates heat in the second heat exchanger 104 in the outdoor unit 102 and evaporates in the first heat exchanger 101 in the indoor unit 107. .

  By using the expander-integrated compressor 200A in which the heat transfer from the compression mechanism 2 to the expansion mechanism 3 is suppressed, the heating capacity decreases due to the decrease in the discharge temperature of the compression mechanism 2 during the heating operation, and the expansion during the cooling operation. It is possible to prevent a decrease in cooling capacity due to an increase in the discharge temperature of the mechanism 3. As a result, the coefficient of performance of the air conditioner is improved.

Sectional drawing of the expander integrated compressor concerning 1st Embodiment of this invention. D1-D1 cross-sectional view of the expander-integrated compressor shown in FIG. Similarly D2-D2 cross section Partial enlarged view of FIG. Sectional drawing which shows the modification of an oil pump Top view of pump body The schematic diagram which shows the groove | channel for oil supply formed in the outer peripheral surface of a 2nd shaft Sectional drawing of the expander integrated compressor concerning 2nd Embodiment Sectional drawing of the expander integrated compressor concerning 3rd Embodiment Configuration diagram of a refrigeration cycle apparatus using an expander-integrated compressor Sectional view of a conventional expander-integrated compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Expansion mechanism 5 Shaft 6 Oil pump 24 Inner space 25 of airtight container 25 Oil pool 25a Upper pool 25b Lower first pool 25c Lower second pool 31 Partition member 31h Through-hole 62q Oil inlets 80, 85, 87,89 Oil amount adjusting passage 83,183 Capsule 200A, 200B, 200C Expander-integrated compressor

Claims (9)

A sealed container whose bottom is used as an oil reservoir and whose internal space is filled with a compressed high-pressure working fluid;
A compression mechanism that is disposed in an upper portion of the sealed container and compresses the working fluid and discharges the compressed fluid into the inner space of the sealed container;
An expansion mechanism that is disposed in the lower part of the sealed container and recovers power from the expanding working fluid;
A shaft that connects the compression mechanism and the expansion mechanism so that power recovered by the expansion mechanism is transmitted to the compression mechanism;
An oil pump disposed between the compression mechanism and the expansion mechanism in the axial direction of the shaft, and supplying oil stored in the oil reservoir to the compression mechanism;
A first partition member that partitions the oil reservoir into an upper pool that stores oil to be sucked by the oil pump and a lower pool in which the expansion mechanism is disposed;
The lower pool is partitioned into a lower first pool for storing oil to be supplied to the expansion mechanism and a lower second pool isolated from both the upper pool and the lower first pool, and around the expansion mechanism A second partition member that surrounds the expansion mechanism so that the lower first pool is formed and the lower second pool is formed around the lower first pool;
One end is connected to the upper pool and the other end is connected to the lower first pool so as to allow oil to flow between the upper pool and the lower first pool so as to bypass the lower second pool. An oil amount adjusting passage connected to the
A compressor integrated with an expander.   2. The expander-integrated compressor according to claim 1, wherein the oil amount adjusting passage includes a pipe having one end inserted into the first partition member from the lower surface side and the other end inserted into the second partition member.   The expander-integrated compressor according to claim 1, wherein the oil amount adjustment passage passes through the outside of the sealed container.   The oil amount adjusting passage is inserted into the sealed container so that one end is exposed above the upper surface of the first partition member, and the other end of the oil amount adjusting passage passes through the lower second pool. The expander-integrated compressor according to claim 3, comprising a pipe inserted into the partition member.   The first partition member and the second partition member are formed such that a space forming a part of the lower second pool is formed between the lower surface of the first partition member and the upper surface of the second partition member. The expander-integrated compressor according to claim 1, wherein the positional relationship is defined.   The expander-integrated compressor according to claim 1, wherein the second partition member is a capsule that accommodates the expansion mechanism therein. A sealed container whose bottom is used as an oil reservoir and whose internal space is filled with a compressed high-pressure working fluid;
A compression mechanism that is disposed in an upper portion of the sealed container and compresses the working fluid and discharges the compressed fluid into the inner space of the sealed container;
An expansion mechanism that is disposed in the lower part of the sealed container and recovers power from the expanding working fluid;
A shaft that connects the compression mechanism and the expansion mechanism so that power recovered by the expansion mechanism is transmitted to the compression mechanism;
An oil pump that is disposed between the compression mechanism and the expansion mechanism in the axial direction of the shaft and supplies oil stored in an oil reservoir to the compression mechanism;
A first partition member that partitions the oil reservoir into an upper pool that stores oil to be supplied to the compression mechanism and a lower pool in which the expansion mechanism is disposed;
A lower first pool that is disposed in the lower pool and surrounds the expansion mechanism to store oil to be supplied to the expansion mechanism, and moves from the upper pool to the lower first pool or vice versa. A second partition member that forms a lower second pool serving as an oil distribution path in the lower pool;
A first oil amount adjusting passage that allows oil to flow between the upper pool and the lower second pool;
A second oil amount adjusting passage that allows oil to flow between the lower first pool and the lower second pool;
A compressor integrated with an expander. The second partition member is a capsule that houses the expansion mechanism therein,
The first oil amount adjustment passage includes a through hole provided in the first partition member;
The expander-integrated compressor according to claim 7, wherein the second oil amount adjustment passage includes a through hole provided in a bottom portion of the capsule.   A refrigeration cycle apparatus comprising the expander-integrated compressor according to claim 1 or 7.

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