Scroll compressor

Abstract

To provide a scroll compressor which has an improved compression rate.SOLUTION: A scroll compressor 10 includes a fixed scroll 21, a movable scroll 20 which is arranged so as to be rotatable with respect to the fixed scroll 21, a compression space 22 which is formed as a gap between the fixed scroll 21 and the movable scroll 20, a shaft 18 which applies driving force to the movable scroll 20, a fan 17 which is installed on the shaft 18, and a front stage compression chamber 14 in which the fan 17 is stored. In the scroll compressor 10, the fan 17 and the front stage compression chamber 14 are arranged in the upstream side of the movable scroll 20 in the flow of a refrigerant 11.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a scroll compressor, and more particularly to a scroll compressor capable of increasing the compressibility of a fluid. [Background technology]

[0002] In a typical scroll compressor, a fixed scroll is fixed to a scroll body, and a movable scroll is combined with the fixed scroll so that the fixed scroll can rotate about the movable scroll. When the scroll compressor is operated, the movable scroll rotates around the center of rotation as the axis of rotation, and fluid introduced from the periphery of the scroll compressor between the fixed scroll and the movable scroll moves toward the center while being compressed between the two. The fluid that reaches the center is supplied to the outside of the system in a compressed state. A scroll compressor with such a configuration is described in, for example, Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4635660 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a scroll compressor having the above-described general configuration, since a fluid that is not highly pressurized is introduced into the space between the movable scroll and the fixed scroll, there is a problem that it is not easy to obtain a high compression ratio.

[0005] Furthermore, if the rotation speed of the motor is increased in order to improve the compression ratio of the scroll compressor, a problem arises in that the energy consumed by the scroll compressor increases.

[0006] Furthermore, if a compressor that compresses the fluid is installed in the front stage of the scroll compressor in order to increase the compression ratio, the fluid pressurized by the compressor can be supplied to the scroll compressor, and thus a high compression ratio can be obtained. However, since a separate compressor is required, there is a problem that the entire device becomes complicated and expensive.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a scroll compressor having an improved compression ratio. [Means for solving the problem]

[0008] The scroll compressor of the present invention is a compressor that compresses a refrigerant used in a vapor compression refrigeration cycle, and is characterized in that it comprises a fixed scroll, a movable scroll arranged to be rotatable relative to the fixed scroll, a compression space formed as a gap between the fixed scroll and the movable scroll, a shaft that provides a driving force to the movable scroll, a fan attached to the shaft, and a front-stage compression chamber in which the fan is accommodated, and that the fan and the front-stage compression chamber are arranged upstream of the movable scroll in the flow of the refrigerant.

[0009] In addition, in the scroll compressor of the present invention, the fan has a first fan and a second fan arranged downstream of the first fan, and the pre-stage compression chamber has a first pre-stage compression chamber in which the first fan is accommodated, and a second pre-stage compression chamber in which the second fan is accommodated.

[0010] In the scroll compressor of the present invention, the fan has a main surface portion and an air blowing wall, the main surface portion being a substantially circular surface extending in a direction perpendicular to the axial direction of the shaft, and the air blowing wall being a partially raised portion of the main surface portion and extending radially outward in a wall-like manner.

[0011] In addition, in the scroll compressor of the present invention, the main surface portion has an upstream main surface portion facing the upstream side in the refrigerant flow, and a downstream main surface portion facing the downstream side in the refrigerant flow, and the air blowing wall has an upstream air blowing wall formed on the upstream main surface portion, and a downstream air blowing wall formed on the downstream main surface portion.

[0012] In the scroll compressor of the present invention, the intermediate portion of the upstream blowing wall has a curved shape that bulges in the rotation direction of the fan.

[0013] In the scroll compressor of the present invention, the intermediate portion of the downstream blowing wall has a shape curved so as to be recessed toward the rotation direction of the fan.

[0014] The scroll compressor of the present invention further includes a fan casing configured to cover the fan, the pre-stage compression chamber is a space formed between an inner wall of the fan casing and the fan, the fan has an upstream main surface portion facing the upstream side in the flow of the refrigerant, a downstream main surface portion facing the downstream side in the flow of the refrigerant, and a side surface portion facing radially outward, and the thickness of the gap between the upstream main surface portion and the inner wall, the thickness of the gap between the downstream main surface portion and the inner wall, and the thickness of the side surface portion and the inner wall are approximately identical.

[0015] In the scroll compressor of the present invention, the distance between the lower end of the fan and the previous-stage compression chamber in the vertical direction is shorter than the distance between the upper end of the fan and the previous-stage compression chamber.

[0016] In the scroll compressor of the present invention, a protrusion protruding radially outward is formed on a side surface of the fan. Effect of the Invention

[0017] The scroll compressor according to the present invention is a compressor for compressing a refrigerant used in a vapor compression refrigeration cycle, and is characterized in that it comprises a fixed scroll, a movable scroll arranged to be rotatable relative to the fixed scroll, a compression space formed as a gap between the fixed scroll and the movable scroll, a shaft for providing a driving force to the movable scroll, a fan attached to the shaft, and a front-stage compression chamber in which the fan is accommodated, the fan and the front-stage compression chamber being arranged upstream of the movable scroll in the flow of the refrigerant. According to the scroll compressor according to the embodiment of the present invention, the rotation of the fan in the front-stage compression chamber allows pressurized refrigerant to be supplied to the compression space, thereby improving the compression efficiency of the scroll compressor.

[0018] In the scroll compressor of the present invention, the fan includes a first fan and a second fan arranged downstream of the first fan, and the pre-stage compression chamber includes a first pre-stage compression chamber in which the first fan is housed and a second pre-stage compression chamber in which the second fan is housed. According to the scroll compressor of the embodiment of the present invention, by having a plurality of fans and pre-stage compression chambers in series, it is possible to supply a refrigerant in a further compressed state toward the compression space.

[0019] In the scroll compressor of the present invention, the fan has a main surface portion and a blowing wall, the main surface portion being a substantially circular surface extending in a direction perpendicular to the axial direction of the shaft, and the blowing wall being a part of the main surface portion that is partially raised and extends radially outward in a wall shape. According to the scroll compressor of the embodiment of the present invention, the blowing wall blows the refrigerant radially outward, thereby making it possible to compress the refrigerant more effectively.

[0020] In the scroll compressor of the present invention, the main surface portion has an upstream main surface portion facing the upstream side in the refrigerant flow and a downstream main surface portion facing the downstream side in the refrigerant flow, and the blowing wall has an upstream blowing wall formed on the upstream main surface portion and a downstream blowing wall formed on the downstream main surface portion. According to the scroll compressor of the embodiment of the present invention, the refrigerant can be compressed inside the front-stage compression chamber by the upstream blowing wall and the downstream blowing wall, so that the refrigerant can be compressed more effectively.

[0021] In the scroll compressor of the present invention, the intermediate portion of the upstream blowing wall has a curved shape that bulges toward the rotation direction of the fan. According to the scroll compressor of the embodiment of the present invention, the rotation of the fan causes the upstream blowing wall to blow the refrigerant radially outward, thereby making it possible to compress the refrigerant more effectively.

[0022] In the scroll compressor of the present invention, the intermediate portion of the downstream blowing wall has a curved shape recessed toward the rotation direction of the fan. According to the scroll compressor of the embodiment of the present invention, the rotation of the fan causes the downstream blowing wall to blow the refrigerant radially inward, thereby making it possible to compress the refrigerant more effectively.

[0023] In addition, the scroll compressor of the present invention further includes a fan casing configured to cover the fan, the pre-stage compression chamber is a space formed between an inner wall of the fan casing and the fan, the fan has an upstream main surface portion facing the upstream side in the flow of the refrigerant, a downstream main surface portion facing the downstream side in the flow of the refrigerant, and a side surface portion facing radially outward, and a thickness of a gap between the upstream main surface portion and the inner wall, a thickness of a gap between the downstream main surface portion and the inner wall, and a thickness of the side surface portion and the inner wall are approximately the same. According to the scroll compressor of the embodiment of the present invention, the refrigerant can be effectively compressed between the inner wall of the fan casing and the fan.

[0024] In the scroll compressor of the present invention, the distance between the lower end of the fan and the previous-stage compression chamber in the vertical direction is shorter than the distance between the upper end of the fan and the previous-stage compression chamber. According to the scroll compressor of the embodiment of the present invention, the distance between the lower end of the fan and the previous-stage compression chamber is shortened, so that the lubricating oil stored at the lower end of the previous-stage compression chamber can be agitated and mixed with the refrigerant in a mist state.

[0025] In the scroll compressor of the present invention, a protrusion protruding radially outward is formed on a side surface of the fan. According to the scroll compressor of the embodiment of the present invention, even if lubricating oil is stored at the lower end of the front compression chamber under operating conditions, the protrusion can agitate the lubricating oil and mix it with the refrigerant in a mist state. [Brief description of the drawings]

[0026] [Figure 1A] 1 is a perspective view showing a scroll compressor according to an embodiment of the present invention. [Figure 1B] 1 is a cutaway perspective view showing a scroll compressor according to an embodiment of the present invention; [Diagram 2] 1 is a cross-sectional view showing a scroll compressor according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a perspective view showing a fan casing of the scroll compressor according to the embodiment of the present invention. [Figure 4] 1 is a cross-sectional view showing a fan casing of a scroll compressor according to an embodiment of the present invention. [Figure 5A] 1 is an exploded front perspective view of a first fan and a second fan of a scroll compressor according to an embodiment of the present invention. FIG. [Figure 5B] FIG. 2 is an exploded perspective view of a first fan and a second fan of the scroll compressor according to the embodiment of the present invention, as viewed from the rear. [Figure 6] FIG. 2 is a front view of a first fan of the scroll compressor according to the embodiment of the present invention, as viewed from the front. [Figure 7]FIG. 4 is a front view of a first fan of a scroll compressor according to another embodiment of the present invention, as viewed from the front. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] The scroll compressor 10 of this embodiment will be described below with reference to the drawings. In the following description, the same parts are given the same reference numerals, and duplicated description will be omitted. Furthermore, in the following description, the up, down, front, back, left and right directions will be used as appropriate, with the front indicating the upstream side of the fluid flow inside the scroll compressor 10, and the rear indicating the opposite side of the front. Furthermore, the left and right indicate the left and right when the scroll compressor 10 is viewed from the front.

[0028] Fig. 1A is a perspective view showing a scroll compressor 10. Fig. 1B is a cutaway perspective view showing the scroll compressor 10.

[0029] 1A and 1B, scroll compressor 10 is a compressor that compresses refrigerant 11 used in a vapor compression refrigeration cycle. Scroll compressor 10 is connected to a condenser, an expansion means, and an evaporator (not shown) through piping (not shown). Such a refrigeration cycle is used, for example, as an air conditioner for a vehicle cabin that cools or heats the cabin of a vehicle.

[0030] The refrigeration cycle according to this embodiment is, for example, a mist lubrication system. In the mist lubrication system, lubricating oil dissolved in a refrigerant 11 (described later) is circulated in the refrigeration cycle together with the refrigerant 11, and the sliding parts of the compressor are lubricated by the mist-like lubricating oil contained in the gaseous refrigerant 11. As described later, this embodiment has a mechanism for re-misting the liquefied lubricating oil, so that the refrigerant 11 always contains the mist-like lubricating oil, and each device is kept in a lubricated state.

[0031] 1A and 1B, in scroll compressor 10, each member functioning as scroll compressor 10 is housed inside casing 31. Referring to Fig. 1B, fan casing 15 and motor 23 are housed on the front side of casing 31.

[0032] FIG. 2 is a cross-sectional view showing the scroll compressor 10.

[0033] 2, arranged inside casing 31 from the front side are intake port 13, front chamber 19, fan casing 15, partition wall 12, motor housing chamber 16, motor 23, movable scroll 20, fixed scroll 21, compression space 22, and discharge port 24. Furthermore, shaft 18 is arranged in the center of casing 31. Although not shown here, an orbiting mechanism for converting the rotational motion of shaft 18 into orbiting motion of movable scroll 20 is arranged in front of movable scroll 20.

[0034] The intake port 13 is an opening formed in the front surface of the casing 31. The refrigerant 11 is drawn through the intake port 13.

[0035] The front chamber 19 is a space formed at the front end of the casing 31. The front chamber 19 is a space that houses the fan casing 15.

[0036] The fan casing 15 is a case-shaped member for accommodating a fan 17, which will be described later. The front end of the fan casing 15 is connected to the intake port 13. The rear end of the fan casing 15 communicates with a motor housing chamber 16.

[0037] The fan 17 is attached to the shaft 18 so as to be unable to rotate relative to the shaft 18. The fan 17 has a function of compressing the refrigerant 11 introduced into the compression space 22 on the upstream side. This function will be described later with reference to FIG. 4 etc. In this embodiment, the fan 17 and a front-stage compression chamber 14 described later are disposed upstream of the movable scroll 20, the fixed scroll 21 and the compression space 22 in the flow of the refrigerant 11.

[0038] The partition wall 12 is a wall-like member that separates the front chamber 19 and the motor storage chamber 16 inside the casing 31. A through hole is formed substantially in the center of the partition wall 12, and the front chamber 19 and the motor storage chamber 16 communicate with each other via the through hole.

[0039] The motor storage chamber 16 is a space in which the motor 23 is stored.

[0040] The motor 23 includes a rotor 25 and a stator 26. In this embodiment, the motor 23 rotates the movable scroll 20 described above, and further rotates the fan 17.

[0041] Rotor 25 includes a plurality of magnets (not shown) arranged at approximately equal intervals along the circumferential direction. A through hole is formed in the radial center of rotor 25, and shaft 18 is inserted into the through hole. Rotor 25 and shaft 18 are connected to each other so that they cannot rotate relative to each other. Therefore, when rotor 25 rotates, shaft 18 also rotates.

[0042] The stator 26 is made up of a stator core 261 and a coil 262. The stator core 261 is fitted inside the casing 31. The stator core 261 is also referred to as an iron core. The coil 262 is wound around the stator core 261. AC power of a predetermined frequency is supplied to the coil 262 from an inverter (not shown). The stator 26 constitutes an electromagnet.

[0043] The shaft 18 is a generally cylindrical steel rod that provides driving force to the movable scroll 20. The front end of the shaft 18 is connected to the fan 17 so as not to rotate relative to it, the middle part of the shaft 18 is connected to the rotor 25 so as not to rotate relative to it, and the rear end of the shaft 18 is connected to a turning mechanism that turns the movable scroll 20. This turning mechanism is not shown here. The shaft 18 is rotatably fixed to the casing 31 via a bearing or the like.

[0044] The movable scroll 20 is connected to the rear end of the shaft 18 so as to be non-rotatable relative to the fixed scroll 21, and is disposed so as to be rotatable relative to the fixed scroll 21. The movable scroll 20 orbits by rotating together with the shaft 18.

[0045] The fixed scroll 21 is fixed to the inner surface of the rear portion of the casing 31 .

[0046] The compression space 22 is formed as a gap between the fixed scroll 21 and the movable scroll 20 .

[0047] The discharge port 24 is a through hole that penetrates the rear surface of the casing 31. The discharge port 24 communicates with the compression space 22.

[0048] The flow of the refrigerant 11 inside the scroll compressor 10 will be described with further reference to Fig. 2. In Fig. 2, the flow of the refrigerant 11 inside the scroll compressor 10 is indicated by a dashed line.

[0049] First, the refrigerant 11 is introduced into the scroll compressor 10 through the intake port 13. Here, the refrigerant 11 that has passed through the evaporator is introduced into the scroll compressor 10. Next, the refrigerant 11 is introduced into the fan casing 15. The refrigerant 11 is pre-compressed by the rotation of the fan casing 15. The refrigerant 11 pre-compressed in the fan casing 15 is introduced into the motor housing chamber 16. The refrigerant 11 is then introduced into the compression space 22, and is further compressed in the compression space 22 by the orbiting of the movable scroll 20. The refrigerant 11 is then discharged to the outside of the scroll compressor 10 through the discharge port 24. The refrigerant 11 is then sent to the condenser through piping.

[0050] As described later, according to this embodiment, the refrigerant 11 pressurized by the rotation of the fan 17 in the front-stage compression chamber 14 can be supplied to the compression space 22, so that the compression efficiency of the scroll compressor 10 can be improved.

[0051] FIG. 3 is a perspective view showing the fan casing 15 of the scroll compressor 10. As shown in FIG.

[0052] Fan casing 15 is a generally cylindrical member having a central axis along the front-rear direction. The side surface of fan casing 15 is disposed so as to abut against the inner surface of casing 31 shown in FIG. 2. Fan 17 described above is housed inside fan casing 15. A front-stage inlet 32 ​​is formed in the center of the front surface of fan casing 15. Front-stage inlet 32 ​​is connected to intake 13 shown in FIG. 2.

[0053] Fig. 4 is a cross-sectional view showing a fan casing 15 of the scroll compressor 10. In Fig. 4, the flow of the refrigerant 11 is indicated by dashed arrows.

[0054] The fan casing 15 is made of a metal member configured to cover the fan 17 .

[0055] The fan 17 includes a first fan 28 and a second fan 29. The first fan 28 is disposed upstream of the second fan 29 in the flow of the refrigerant 11.

[0056] The pre-stage compression chamber 14 is a space formed between the inner wall 27 of the fan casing 15 and the fan 17. The pre-stage compression chamber 14 is disposed upstream of the compression space 22 described above, and is a space for performing pre-stage compression of the refrigerant 11. In other words, the pre-stage compression chamber 14 is also a space for supercharging the refrigerant 11 to the compression space 22 disposed downstream.

[0057] The front-stage compression chamber 14 has a first front-stage compression chamber 141 in which the first fan 28 is housed, and a second front-stage compression chamber 142 in which the second fan 29 is housed. The first front-stage compression chamber 141 is a space formed between the inner wall 27 and the first fan 28. The second front-stage compression chamber 142 is a space formed between the inner wall 27 and the second fan 29. The second front-stage compression chamber 142 is disposed downstream of the first front-stage compression chamber 141. The first front-stage compression chamber 141 and the second front-stage compression chamber 142 are continuous spaces.

[0058] Inside the fan casing 15, the refrigerant 11 flows through the front-stage inlet 32, the first front-stage compression chamber 141, the second front-stage compression chamber 142, and the front-stage outlet 33 in this order.

[0059] The first fan 28 has a first upstream main surface portion 281 and a first downstream main surface portion 282 that are main surface portions, and a first side surface portion 285. The first upstream main surface portion 281 is a main surface that faces forward, the first downstream main surface portion 282 is a main surface that faces rearward, and the first side surface portion 285 is a surface that faces in the radial direction.

[0060] In the first fan 28, the thickness L10 of the gap between the first upstream main surface portion 281 and the inner wall 27, the thickness L11 of the gap between the first downstream main surface portion 282 and the inner wall 27, and the thickness L12 of the first side surface portion 285 and the inner wall 27 are approximately the same. For example, when comparing L10, L11, and L12, any one is 2 times or less than the other two, preferably 1.5 times or less, and particularly preferably 1.2 times or less. Furthermore, when comparing L10, L11, and L12, any one is 0.5 times or more than the other two, preferably 0.75 times or more, and particularly preferably 0.9 times or more. In this way, the refrigerant 11 flows smoothly in the first front-stage compression chamber 141, and the refrigerant 11 can be effectively compressed.

[0061] The same applies to the second front-stage compression chamber 142.

[0062] Fig. 5A is an exploded perspective view of the first fan 28 and the second fan 29 of the scroll compressor 10 as viewed from the front. Fig. 5B is an exploded perspective view of the first fan 28 and the second fan 29 of the scroll compressor 10 as viewed from the rear.

[0063] With reference to FIG. 5A, the fan 17 has, from the front side, a first fan 28 and a second fan 29.

[0064] 5A and 5B, as described above, the first fan 28 has a first upstream main surface portion 281, a first downstream main surface portion 282, and a first side surface portion 285. The first upstream main surface portion 281 is a substantially circular surface extending in a direction perpendicular to the axial direction of the shaft 18, and faces the upstream side in the flow of the refrigerant 11. The first downstream main surface portion 282 is a substantially circular surface extending in a direction perpendicular to the axial direction of the shaft 18, and faces the downstream side in the flow of the refrigerant 11. In addition, a first insertion hole 286 is formed in the center of the first fan 28, and a first insertion hole 296 is formed in the center of the second fan 29. The shaft 18 described above is inserted into the first insertion hole 286 and the first insertion hole 296.

[0065] As shown in FIG. 5A, the first upstream blowing wall 283 is formed on the first upstream main surface 281. The first upstream blowing wall 283 is a part of the first upstream main surface 281 that is partially raised forward and extends radially outward in a wall shape. The middle part of the first upstream blowing wall 283 has a curved shape that bulges toward the rotation direction of the fan 17. Here, the rotation direction is counterclockwise when the first fan 28 is viewed from the front. In addition, the first upstream blowing wall 283 is formed in plurality on the first upstream main surface 281, spaced apart at approximately the same angular intervals along the circumferential direction. When the first fan 28 rotates counterclockwise, as shown in FIG. 4, in the first front-stage compression chamber 141 surrounded by the first upstream main surface 281 and the inner wall 27, the refrigerant 11 flows from the center of the first fan 28 toward the radially outward direction.

[0066] As shown in Fig. 5B, a first downstream blowing wall 284 is formed on the first downstream main surface portion 282. The first downstream blowing wall 284 is a portion of the first upstream main surface portion 281 that is partially raised backward, and extends radially outward in a wall shape. An intermediate portion of the first downstream blowing wall 284 has a curved shape that is recessed in the counterclockwise direction, which is the rotation direction of the fan 17. When the first fan 28 rotates counterclockwise, the refrigerant 11 flows radially inward from the periphery of the first fan 28 in the first front-stage compression chamber 141 surrounded by the first downstream main surface portion 282 and the inner wall 27, as shown in Fig. 4.

[0067] The second fan 29 has the same configuration as described above. That is, referring to Figures 5A and 5B, the second fan 29 has a second upstream main surface portion 291, a second downstream main surface portion 292, and a second side surface portion 295. In addition, a second upstream blowing wall 293 is formed on the second upstream main surface portion 291, and a second downstream blowing wall 294 is formed on the second downstream main surface portion 292.

[0068] Referring again to FIG. 4, the effects of the walls formed on the first fan 28 and the second fan 29 will be described. First, the refrigerant 11 introduced from the front-stage inlet 32 ​​enters between the inner wall 27 and the first upstream main surface portion 281. As described above, the first upstream blowing wall 283 is formed on the first upstream main surface portion 281. Therefore, as the first fan 28 rotates, the first upstream blowing wall 283 blows the refrigerant 11 radially outward. Thereafter, the refrigerant 11 passes between the first side surface portion 285 and the inner wall 27, and is blown between the first downstream main surface portion 282 and the inner wall 27. Thereafter, the first downstream blowing wall 284 formed on the first downstream main surface portion 282 blows the refrigerant 11 radially inward. That is, the first upstream blowing wall 283 blows the refrigerant 11 radially outward, and then the first downstream blowing wall 284 blows the refrigerant 11 radially inward. Therefore, by blowing the refrigerant 11 on both the first upstream main surface portion 281 side and the first downstream main surface portion 282 side of the first fan 28, the refrigerant 11 can be compressed more effectively.

[0069] The above-mentioned matters also apply to the second fan 29. That is, the second upstream-side blowing wall 293 of the second fan 29 blows the refrigerant 11 radially outward, and the second downstream-side blowing wall 294 blows the refrigerant 11 radially inward. This causes the refrigerant 11 to be further compressed, and the supercharging effect is increased.

[0070] FIG. 6 is a front view of the first fan 28 of the scroll compressor 10 as viewed from the front.

[0071] Here, the first fan 28 is disposed eccentrically downward inside the first front-stage compression chamber 141. In this manner, in the vertical direction, a distance L20 between the lower end of the first fan 28 and the inner wall 27 is shorter than a distance L21 between the upper end of the fan 17 and the inner wall 27. For example, the ratio of L20 to L21 can be 2 / 3 or less, or 1 / 2 or less.

[0072] In this way, it is possible to suppress the accumulation of lubricating oil inside the first pre-stage compression chamber 141. Specifically, as described above, the scroll compressor 10 of this embodiment is a mist lubrication type. Therefore, when the scroll compressor 10 is operated, the lubricating oil contained in the refrigerant 11 inside the first pre-stage compression chamber 141 may separate from the refrigerant 11, and the lubricating oil may accumulate at the lower end portion of the first pre-stage compression chamber 141. In FIG. 6, the lubricating oil accumulated at the lower end of the first pre-stage compression chamber 141 is represented by color. If this continues, the refrigerant 11 will not contain a sufficient amount of lubricating oil. Therefore, in a device having a moving part in a vapor compression refrigeration cycle, such as the scroll compressor 10, sufficient lubrication is not performed, and the life of the device may be shortened.

[0073] In this embodiment, the first side surface portion 285 is disposed eccentrically downward. Therefore, when the first fan 28 rotates during operation of the scroll compressor 10, the first upstream blowing wall 283 stirs the stored lubricating oil, and the lubricating oil is again turned into a mist inside the first pre-stage compression chamber 141 and mixed with the refrigerant 11. Therefore, the lubricating oil in a mist state is supplied to each device of the vapor compression refrigeration cycle together with the refrigerant 11, and the life of the devices can be extended.

[0074] FIG. 7 is a front view of the first fan 28 of the scroll compressor 10 according to another embodiment, as viewed from the front.

[0075] Here, protrusions 30 that protrude radially outward are formed on a first side surface portion 285, which is the outer circumferential surface of the first fan 28. The protrusions 30 are arranged at approximately equal intervals along the circumferential direction on the first side surface portion 285. Here, in the up-down direction, the first fan 28 may be arranged at the center of the first front-stage compression chamber 141, or may be arranged eccentrically downward as shown in Fig. 7. The protrusions 30 are also called slingers.

[0076] Protrusion 30 can turn lubricating oil accumulated in the lower part of first pre-stage compression chamber 141 into a mist. Specifically, when first fan 28 rotates during operation of scroll compressor 10, protrusion 30 agitates the accumulated lubricating oil, turning the lubricating oil into a mist again inside first pre-stage compression chamber 141 and mixing it with refrigerant 11. Thus, lubricating oil in a mist state can be supplied to each device of the vapor compression refrigeration cycle together with refrigerant 11, thereby extending the life of the devices.

[0077] Although the embodiment of the present invention has been described above, the present invention is not limited to this, and modifications can be made without departing from the scope of the present invention. In addition, the above-described embodiments can be combined with each other.

[0078] For example, referring to FIG. 2, the motor 23 does not necessarily have to be built into the casing 31, and the motor 23 can also be disposed outside the casing 31. [Explanation of symbols]

[0079] 10 Scroll Compressor 11 Refrigerants 12 Compartment Wall 13 Intake 14 Pre-compression chamber 141 First pre-compression chamber 142 Second pre-compression chamber 15 Fan casing 16 Motor storage room 17 Fan 18 Shaft 19 Front room 20 Movable scroll 21 Fixed Scroll 22 Compressed Space 23 Motor 24 Outlet 25 Rotor 26 Stator 261 Stator core 262 Coil 27 Inner wall 28 First Fan 281 1st upstream main surface section 282 1st downstream main surface section 283 First upstream ventilation wall 284 First downstream ventilation wall 285 First side part 286 First Through Hole 29 Second Fan 291 2nd upstream main surface section 292 2nd downstream main surface section 293 Second upstream ventilation wall 294 Second downstream ventilation wall 295 Second side part 296 First Through Hole 30 Protrusion 31 Casing 32 Front inlet 33 Front stage discharge port

Claims

1. A compressor that compresses a refrigerant used in a vapor compression refrigeration cycle. a fixed scroll, a movable scroll arranged to be rotatable relative to the fixed scroll, a compression space formed as a gap between the fixed scroll and the movable scroll, a shaft that applies a driving force to the movable scroll, a fan attached to the shaft, and a front-stage compression chamber in which the fan is housed, The scroll compressor, wherein the fan and the front-stage compression chamber are arranged upstream of the movable scroll in a flow of the refrigerant.

2. The fan includes a first fan and a second fan disposed downstream of the first fan, 2. The scroll compressor according to claim 1, wherein the pre-compression chamber includes a first pre-compression chamber in which the first fan is accommodated, and a second pre-compression chamber in which the second fan is accommodated.

3. The fan has a main surface portion and a blowing wall, The main surface portion is a substantially circular surface extending in a direction perpendicular to an axial direction of the shaft, 2. The scroll compressor according to claim 1, wherein the air blowing wall is a part of the main surface portion that is partially raised, and extends radially outward in a wall shape.

4. The main surface portion has an upstream main surface portion facing the upstream side in the flow of the refrigerant and a downstream main surface portion facing the downstream side in the flow of the refrigerant, 4. The scroll compressor according to claim 3, wherein the air blowing wall includes an upstream air blowing wall formed on the upstream main surface portion, and a downstream air blowing wall formed on the downstream main surface portion.

5. 5. The scroll compressor according to claim 4, wherein a middle portion of the upstream blowing wall has a curved shape that bulges in a rotation direction of the fan.

6. 6. The scroll compressor according to claim 4, wherein an intermediate portion of the downstream blowing wall has a shape curved so as to be recessed toward a rotation direction of the fan.

7. Further comprising a fan casing configured to cover the fan, The front-stage compression chamber is a space formed between an inner wall of the fan casing and the fan, the fan has an upstream main surface portion facing an upstream side in a flow of the refrigerant, a downstream main surface portion facing a downstream side in the flow of the refrigerant, and a side surface portion facing radially outward, 2. The scroll compressor according to claim 1, wherein a thickness of the gap between the upstream main surface portion and the inner wall, a thickness of the gap between the downstream main surface portion and the inner wall, and a thickness of the side portion and the inner wall are substantially the same.

8. 2. The scroll compressor according to claim 1, wherein a distance between a lower end of the fan and the front-stage compression chamber in a vertical direction is shorter than a distance between an upper end of the fan and the front-stage compression chamber.

9. 2. The scroll compressor according to claim 1, wherein a protrusion protruding radially outward is formed on a side surface of the fan.

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