Scroll compressor

Abstract

Provided is a scroll compressor having an improved compression ratio. A scroll compressor (10) is provided with: a fixed scroll (21); a movable scroll (20) disposed so as to be capable of turning around with respect to the fixed scroll (21); a compression space (22) formed as a gap between the fixed scroll (21) and the movable scroll (20); a shaft (18) that applies a driving force to the movable scroll (20); a fan (17) attached to the shaft (18); and a preceding-stage compression chamber (14) that houses the fan (17). In a scroll compressor (10), a fan (17) and a preceding-stage compression chamber (14) are disposed upstream of a movable scroll plate (20) in a flow path of a refrigerant (11).

Description

TECHNICAL FIELD

[0001] The present application relates to a scroll compressor, and particularly to a scroll compressor capable of improving a compression ratio of a fluid. BACKGROUND

[0002] In a general scroll compressor, a fixed scroll is fixed to a scroll main body, and a movable scroll is assembled so as to be able to revolve with respect to the fixed scroll. When the scroll compressor is operated, the movable scroll revolves around a revolving center as a rotation axis, and thereby a fluid introduced from a peripheral portion of the scroll compressor to a space between the fixed scroll and the movable scroll is compressed while moving toward a center portion. The fluid reaching the center portion is supplied to the outside of the system in a compressed state. Such a scroll compressor is described in, for example, Patent Literature 1.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent No. 4635660 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, in the scroll compressor having the above-described general structure, since a fluid in a state not sufficiently pressurized is introduced to the space between the movable scroll and the fixed scroll, there is a problem that a high compression ratio is not easily obtained.

[0008] Further, if the rotation speed of the motor is made high in order to improve the compression ratio of the scroll compressor, there is a problem that the energy consumed by the scroll compressor increases.

[0009] Further, if a compressor that compresses a fluid is installed at a front stage of the scroll compressor in order to improve the compression ratio thereof, the fluid pressurized by the compressor can be supplied to the scroll compressor, and thereby a high compression ratio can be obtained. However, since a separate compressor is additionally required, there is a problem that the entire device is complicated and high cost.

[0010] The present application has been achieved in view of the above-described circumstances, and an object thereof is to provide a scroll compressor improved in a compression ratio.

[0011] MEANS FOR SOLVING THE PROBLEMS

[0012] The scroll compressor of the present application is a compressor that compresses a refrigerant used in a vapor compression refrigeration cycle, characterized by comprising: a fixed scroll; a movable scroll configured to be able to orbit with respect 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 mounted to the shaft; and a pre-stage compression chamber that houses the fan, the fan and the pre-stage compression chamber being disposed at a position upstream of the movable scroll in a flow path of the refrigerant.

[0013] In addition, in the scroll compressor of the present application, characterized in that the fan has a first fan and a second fan disposed at a position downstream of the first fan, and the pre-stage compression chamber has a first pre-stage compression chamber that houses the first fan and a second pre-stage compression chamber that houses the second fan.

[0014] In addition, in the scroll compressor of the present application, characterized in that the fan has a main face portion that is a substantially circular face extending in a direction orthogonal to an axial direction of the shaft, and a blow wall that is a portion where the main face portion is partially raised and extends in a wall shape toward an outer side in a radial direction.

[0015] In addition, in the scroll compressor of the present application, characterized in that the main face portion has an upstream side main face portion toward an upstream side in the flow path of the refrigerant and a downstream side main face portion toward a downstream side in the flow path of the refrigerant, and the blow wall has an upstream side blow wall formed in the upstream side main face portion and a downstream side blow wall formed in the downstream side main face portion.

[0016] In addition, in the scroll compressor of the present application, characterized in that an intermediate portion of the upstream side blow wall is curved in a shape that bulges toward a rotation direction of the fan.

[0017] In addition, in the scroll compressor of the present application, characterized in that an intermediate portion of the downstream side blow wall is curved in a shape that is recessed toward a rotation direction of the fan.

[0018] In addition, in the scroll compressor of the present application, characterized by further comprising a fan casing that covers 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 side main face portion toward an upstream side in the flow path of the refrigerant, a downstream side main face portion toward a downstream side in the flow path of the refrigerant, and a side face portion toward an outer side in a radial direction, and a thickness of a gap between the upstream side main face portion and the inner wall, a thickness of a gap between the downstream side main face portion and the inner wall, and a thickness of the side face portion and the inner wall are substantially the same.

[0019] Further, in the scroll compressor of the present application, characterized in that, in the up-and-down direction, the distance from the lower end portion of the fan to the pre-stage compression chamber is shorter than the distance from the upper end portion of the fan to the pre-stage compression chamber.

[0020] Further, in the scroll compressor of the present application, characterized in that, a protruding portion protruding toward the radial direction outside is formed in the side surface portion of the fan.

[0021] Effects of Invention

[0022] The scroll compressor of the present application is a compressor that compresses a refrigerant used in a vapor compression refrigeration cycle, characterized by comprising: a fixed scroll; a movable scroll configured to be able to orbit with respect 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 installed to the shaft; and a pre-stage compression chamber that houses the fan, the fan and the pre-stage compression chamber being disposed at a position more upstream than the movable scroll in a flow path of the refrigerant. According to the scroll compressor of the present application, the refrigerant pressurized by rotation of the fan in the pre-stage compression chamber can be supplied to the compression space, and thus the compression efficiency of the scroll compressor can be improved.

[0023] Further, in the scroll compressor of the present application, characterized in that, the fan has a first fan and a second fan disposed at a position more downstream than the first fan, and the pre-stage compression chamber has a first pre-stage compression chamber that houses the first fan and a second pre-stage compression chamber that houses the second fan. According to the scroll compressor of the present application, by having a plurality of fans and pre-stage compression chambers in series, the refrigerant in a compressed state can be further supplied toward the compression space.

[0024] Further, in the scroll compressor of the present application, characterized in that, the fan has a main surface portion that is a substantially circular surface extending in a direction orthogonal to the axial direction of the shaft, and a blow wall that is a portion in which the main surface portion is partially raised and extends in a wall shape toward the radial direction outside. According to the scroll compressor of the present application, the blow wall blows the refrigerant toward the radial direction outside, and thus the refrigerant can be more effectively compressed.

[0025] Further, in the scroll compressor of the present application, characterized in that the main surface portion has an upstream side main surface portion facing an upstream side in the flow passage of the refrigerant and a downstream side main surface portion facing a downstream side in the flow passage of the refrigerant, and the air supply wall has an upstream side air supply wall formed in the upstream side main surface portion and a downstream side air supply wall formed in the downstream side main surface portion. According to the scroll compressor of the embodiment of the present application, the refrigerant is compressed by the upstream side air supply wall and the downstream side air supply wall inside the pre-stage compression chamber, so the refrigerant can be compressed more efficiently.

[0026] Further, in the scroll compressor of the present application, characterized in that the intermediate portion of the upstream side air supply wall is curved in a shape bulging toward the rotation direction of the fan. According to the scroll compressor of the embodiment of the present application, the refrigerant is supplied toward the outer side in the radial direction by the upstream side air supply wall through the rotation of the fan, so the refrigerant can be compressed more efficiently.

[0027] Further, in the scroll compressor of the present application, characterized in that the intermediate portion of the downstream side air supply wall is curved in a shape recessed toward the rotation direction of the fan. According to the scroll compressor of the embodiment of the present application, the refrigerant is supplied toward the inner side in the radial direction by the downstream side air supply wall through the rotation of the fan, so the refrigerant can be compressed more efficiently.

[0028] Further, in the scroll compressor of the present application, characterized in that a fan casing covering the fan is further provided, 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 side main surface portion facing an upstream side in the flow passage of the refrigerant, a downstream side main surface portion facing a downstream side in the flow passage of the refrigerant, and a side surface portion facing the outer side in the radial direction, and the thickness of the gap between the upstream side main surface portion and the inner wall, the thickness of the gap between the downstream side main surface portion and the inner wall, and the thickness of the side surface portion and the inner wall are substantially the same. According to the scroll compressor of the embodiment of the present application, the refrigerant can be compressed efficiently between the inner wall of the fan casing and the fan.

[0029] Further, in the scroll compressor of the present application, characterized in that the distance between the lower end portion of the fan and the pre-stage compression chamber is shorter than the distance between the upper end portion of the fan and the pre-stage compression chamber in the vertical direction. According to the scroll compressor of the embodiment of the present application, by shortening the distance between the lower end portion of the fan and the pre-stage compression chamber, the lubricating oil stored in the lower end of the pre-stage compression chamber can be stirred and mixed with the refrigerant in the mist state.

[0030] Further, in the scroll compressor of the present application, a protrusion portion protruding toward the outer side in the radial direction is formed in the side surface portion of the fan. According to the scroll compressor of the embodiment of the present application, even if the lubricating oil is stored in the lower end of the pre-stage compression chamber in the operation state, the lubricating oil can be mixed with the refrigerant in the mist state by the protrusion portion stirring the lubricating oil. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1A is a perspective view showing the scroll compressor of the embodiment of the present application.

[0032] Figure 1B is a cutaway perspective view showing the scroll compressor of the embodiment of the present application.

[0033] Figure 2 is a sectional view showing the scroll compressor of the embodiment of the present application.

[0034] Figure 3 is a perspective view showing the fan casing of the scroll compressor of the embodiment of the present application.

[0035] Figure 4 is a sectional view showing the fan casing of the scroll compressor of the embodiment of the present application.

[0036] Figure 5A is an exploded perspective view showing the first fan and the second fan of the scroll compressor of the embodiment of the present application from the front.

[0037] Figure 5B is an exploded perspective view showing the first fan and the second fan of the scroll compressor of the embodiment of the present application from the rear.

[0038] Figure 6 is a front view showing the first fan of the scroll compressor of the embodiment of the present application from the front.

[0039] Figure 7 is a front view showing the first fan of the scroll compressor of the other embodiment of the present application from the front. DETAILED DESCRIPTION

[0040] Hereinafter, the scroll compressor 10 of the present embodiment will be described with reference to the drawings. In the following description, the same reference numerals are assigned to the same parts, and repeated description is omitted. Further, in the following description, each direction of up, down, front, rear, left and right is appropriately used, and the front indicates the upstream side of the flow passage of the fluid inside the scroll compressor 10, and the rear is the opposite side of the front. In addition, the left and right indicate the left and right when the scroll compressor 10 is viewed from the front.

[0041] Figure 1A is a perspective view showing the scroll compressor 10.Figure 1B is a cutaway perspective view showing the scroll compressor 10.

[0042] Referring to Figure 1A and Figure 1B , the scroll compressor 10 is a compressor that compresses a refrigerant 11 used in a vapor compression refrigeration cycle. The scroll compressor 10 is connected via unillustrated piping to a condenser, an expansion mechanism, and an evaporator, which are not illustrated here. This refrigeration cycle is used, for example, as a cabin air conditioner that cools or heats a vehicle cabin.

[0043] The refrigeration cycle of the present embodiment is, for example, a mist lubrication type refrigeration cycle. The mist lubrication type refers to a type in which lubricating oil dissolved in the refrigerant 11 described later is circulated in the refrigeration cycle together with the refrigerant 11, and a mist of lubricating oil contained in the gaseous refrigerant 11 is used to lubricate sliding portions of the compressor. As described later, in the present embodiment, a mechanism that atomizes liquefied lubricating oil again is provided, and thus the refrigerant 11 always contains a mist of lubricating oil, and each device is in a lubricated state.

[0044] Referring to Figure 1A and Figure 1B , in the scroll compressor 10, each component that functions as the scroll compressor 10 is housed inside the housing 31. Referring to Figure 1B , the fan housing 15 and the motor 23 are housed in the front side of the housing 31.

[0045] Figure 2 is a sectional view showing the scroll compressor 10.

[0046] Referring to Figure 2 , inside the housing 31, from the front side, a suction port 13, a front chamber 19, and the fan housing 15, a partition wall 12, a motor housing chamber 16 and the motor 23, a movable scroll 20 and a fixed scroll 21, a compression space 22, and a discharge port 24 are provided. Further, a shaft 18 is provided in the center of the housing 31. Although not illustrated, a whirl mechanism that converts rotational motion of the shaft 18 to whirling motion of the movable scroll 20 is provided in front of the movable scroll 20.

[0047] The suction port 13 is an opening formed in the front surface of the housing 31. The refrigerant 11 is sucked from the suction port 13.

[0048] The front chamber 19 is a space formed in the front end of the housing 31. The front chamber 19 is a space that houses the fan housing 15.

[0049] The fan housing 15 is a housing-like component that houses the fan 17 described later. The front end of the fan housing 15 is connected to the suction port 13. The rear end of the fan housing 15 communicates with the motor housing chamber 16.

[0050] The fan 17 is mounted to the shaft 18 in a manner incapable of relative rotation. The fan 17 has a function of compressing the refrigerant 11 introduced into the compression space 22 on the upstream side. This function is described later with reference to Figure 4 In the present embodiment, the fan 17 and the pre-stage compression chamber 14 described later are disposed at a position more upstream than the movable scroll 20, the fixed scroll 21, and the compression space 22 in the flow path of the refrigerant 11.

[0051] The partition wall 12 is a wall-like member that partitions the front chamber 19 and the motor housing chamber 16 inside the housing 31. A through-hole is formed in the substantially center of the partition wall 12, and the front chamber 19 and the motor housing chamber 16 communicate with each other via the through-hole.

[0052] The motor housing chamber 16 is a space that houses the motor 23.

[0053] The motor 23 includes a rotor 25 and a stator 26. In the present embodiment, the motor 23 rotates the above-described movable scroll 20, and further rotates the fan 17.

[0054] The rotor 25 includes a plurality of magnets (not shown) disposed at substantially equal intervals in the circumferential direction. A through-hole is formed in the radial direction center of the rotor 25, and the shaft 18 is inserted through the through-hole. The rotor 25 and the shaft 18 are connected to each other in a manner incapable of relative rotation. Therefore, when the rotor 25 rotates, the shaft 18 also rotates.

[0055] The stator 26 is constituted by a stator core 261 and a coil 262. The stator core 261 is embedded in the inner surface of the housing 31. The stator core 261 is also referred to as an iron core. The coil 262 is wound around the stator core 261. The coil 262 is supplied with alternating current of a prescribed frequency from an inverter (not shown). The stator 26 constitutes an electromagnet.

[0056] The shaft 18 is a substantially cylindrical steel rod that applies a driving force to the movable scroll 20. The front end of the shaft 18 is connected to the fan 17 in a manner incapable of relative rotation, the middle portion of the shaft 18 is connected to the rotor 25 in a manner incapable of relative rotation, and the rear end of the shaft 18 is connected to a rotation mechanism that rotates the movable scroll 20. Here, the rotation mechanism is not shown. The shaft 18 is rotatably fixed to the housing 31 via a bearing or the like.

[0057] The movable scroll 20 is connected to the rear end of the shaft 18 in a manner incapable of relative rotation, and is disposed so as to be rotatable with respect to the fixed scroll 21. The movable scroll 20 is rotated by the shaft 18, and is rotated by the rotation mechanism.

[0058] The fixed scroll 21 is fixed to the inner surface of the rear surface portion of the housing 31.

[0059] The compression space 22 is formed as a gap between the fixed scroll 21 and the movable scroll 20.

[0060] The discharge port 24 is a through-hole that penetrates the rear surface portion of the housing 31. The discharge port 24 communicates with the compression space 22.

[0061] Further referring to Figure 2 , the flow path of the refrigerant 11 inside the scroll compressor 10 will be described. In Figure 2 , the flow path of the refrigerant 11 inside the scroll compressor 10 is indicated by a broken line.

[0062] First, the refrigerant 11 is introduced into the inside of the scroll compressor 10 via 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 housing 15. By the rotation of the fan 17 inside the fan housing 15, the refrigerant 11 is pre-compressed. The refrigerant 11 that has been pre-compressed in the fan housing 15 is introduced into the inside of the motor housing 16. Thereafter, the refrigerant 11 is introduced into the compression space 22, and is further compressed by the rotation of the movable scroll 20. Then, the refrigerant 11 is discharged to the outside of the scroll compressor 10 via the discharge port 24. Thereafter, the refrigerant 11 is sent to the condenser via the pipe.

[0063] As will be described later, according to the present embodiment, the refrigerant 11 that has been pressurized by the rotation of the fan 17 in the pre-stage compression chamber 14 can be supplied to the compression space 22, and thus the compression efficiency of the scroll compressor 10 can be improved.

[0064] Figure 3 is a perspective view showing the fan housing 15 of the scroll compressor 10.

[0065] The fan housing 15 is a substantially cylindrical member having a central axis in the front-rear direction. The side surface of the fan housing 15 is disposed so as to abut against the inner surface of the housing 31 as shown in Figure 2 . The fan 17 described above is housed inside the fan housing 15. A pre-stage introduction port 32 is formed in the central portion of the front surface of the fan housing 15. The pre-stage introduction port 32 is connected to the intake port 13 shown in Figure 2 .

[0066] Figure 4 is a sectional view showing the fan housing 15 of the scroll compressor 10. In Figure 4 , the flow path of the refrigerant 11 is indicated by an arrow of a broken line.

[0067] The fan housing 15 is composed of a metal member configured to cover the fan 17.

[0068] The fan 17 has a first fan 28 and a second fan 29. In the flow path of the refrigerant 11, the first fan 28 is disposed at a position on the upstream side of the second fan 29.

[0069] 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 on the upstream side of the above-described compression space 22, and is a space in which pre-stage compression of the refrigerant 11 is performed. In other words, the pre-stage compression chamber 14 is also a space for supercharging the refrigerant 11 with respect to the compression space 22 disposed on the downstream side.

[0070] The pre-stage compression chamber 14 has a first pre-stage compression chamber 141 that accommodates the first fan 28, and a second pre-stage compression chamber 142 that accommodates the second fan 29. The first pre-stage compression chamber 141 is a space formed between the inner wall 27 and the first fan 28. The second pre-stage compression chamber 142 is a space formed between the inner wall 27 and the second fan 29. The second pre-stage compression chamber 142 is disposed on the downstream side of the first pre-stage compression chamber 141. The first pre-stage compression chamber 141 and the second pre-stage compression chamber 142 are continuous spaces.

[0071] Inside the fan casing 15, the refrigerant 11 flows in the order of the pre-stage inlet 32, the first pre-stage compression chamber 141, the second pre-stage compression chamber 142, and the pre-stage outlet 33.

[0072] The first fan 28 has a first upstream-side main face portion 281 and a first downstream-side main face portion 282 as main face portions, and a first side face portion 285. The first upstream-side main face portion 281 is a main face that faces forward, the first downstream-side main face portion 282 is a main face that faces rearward, and the first side face portion 285 is a face that faces in the radial direction.

[0073] In the first fan 28, the thickness L10 of the gap between the first upstream-side main face portion 281 and the inner wall 27, the thickness L11 of the gap between the first downstream-side main face portion 282 and the inner wall 27, and the thickness L12 of the first side face portion 285 and the inner wall 27 are substantially the same. For example, if L10, L11, and L12 are compared, any one of them is 2 times or less, preferably 1.5 times or less, and particularly preferably 1.2 times or less, of the other two. Furthermore, if L10, L11, and L12 are compared, any one of them is 0.5 times or more, preferably 0.75 times or more, and particularly preferably 0.9 times or more, of the other two. Thus, the refrigerant 11 flows smoothly in the first pre-stage compression chamber 141, and the refrigerant 11 can be compressed efficiently.

[0074] The same applies to the second pre-stage compression chamber 142.

[0075] Figure 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.Figure 5B is an exploded perspective view of the first fan 28 and the second fan 29 of the scroll compressor 10 viewed from the rear.

[0076] Referring to Figure 5A , the fan 17 has the first fan 28 and the second fan 29 from the front side.

[0077] Referring to Figure 5A and Figure 5B , as described above, the first fan 28 has a first upstream side main face portion 281, a first downstream side main face portion 282, and a first side face portion 285. The first upstream side main face portion 281 is a substantially circular face extending in a direction orthogonal to the axial direction of the shaft 18, and is a face toward the upstream side in the flow path of the refrigerant 11. The first downstream side main face portion 282 is a substantially circular face extending in a direction orthogonal to the axial direction of the shaft 18, and is a face toward the downstream side in the flow path of the refrigerant 11. Further, a first through hole 286 is formed in the center of the first fan 28, and a first through hole 296 is formed in the center of the second fan 29. The aforementioned shaft 18 is inserted in the first through hole 286 and the first through hole 296.

[0078] As shown in Figure 5A , the first upstream side main face portion 281 is formed with a first upstream side air delivery wall 283. The first upstream side air delivery wall 283 is a portion in which the first upstream side main face portion 281 is partially raised toward the front, and extends in a wall shape toward the radially outer side. The middle portion of the first upstream side air delivery wall 283 is curved in a shape in which it bulges toward the rotation direction of the fan 17. Here, in the case where the first fan 28 is viewed from the front, the rotation direction refers to the counterclockwise direction. Further, the first upstream side air delivery wall 283 is separated at substantially the same angle interval along the circumferential direction of the first upstream side main face portion 281, and a plurality of portions are formed. When the first fan 28 rotates counterclockwise, as shown in Figure 4 , in the first pre-stage compression chamber 141 surrounded by the first upstream side main face portion 281 and the inner wall 27, the refrigerant 11 flows from the center of the first fan 28 toward the radially outer side.

[0079] As shown in Figure 5B , the first downstream side main face portion 282 is formed with a first downstream side air delivery wall 284. The first downstream side air delivery wall 284 is a portion in which the first upstream side main face portion 281 is partially raised toward the rear, and extends in a wall shape toward the radially outer side. The middle portion of the first downstream side air delivery wall 284 is curved in a shape in which it is recessed toward the rotation direction of the fan 17, that is, the counterclockwise direction. When the first fan 28 rotates counterclockwise, as shown in Figure 4 , in the first pre-stage compression chamber 141 surrounded by the first downstream side main face portion 282 and the inner wall 27, the refrigerant 11 flows from the periphery of the first fan 28 toward the radially inner side.

[0080] The above structure is also the same for the second fan 29. That is, referring to Figure 5A and Figure 5B , the second fan 29 has a second upstream-side main face portion 291, a second downstream-side main face portion 292, and a second side face portion 295. Further, a second upstream-side air-blowing wall 293 is formed in the second upstream-side main face portion 291, and a second downstream-side air-blowing wall 294 is formed in the second downstream-side main face portion 292.

[0081] Referring again to Figure 4 , the effects of the walls formed in the first fan 28 and the second fan 29 will be described. First, the refrigerant 11 introduced from the front-stage introduction port 32 enters between the inner wall 27 and the first upstream-side main face portion 281. As described above, the first upstream-side air-blowing wall 283 is formed in the first upstream-side main face portion 281. Therefore, with rotation of the first fan 28, the first upstream-side air-blowing wall 283 blows the refrigerant 11 toward the radially outer side. Thereafter, the refrigerant 11 is blown toward between the first downstream-side main face portion 282 and the inner wall 27 via between the first side face portion 285 and the inner wall 27. Thereafter, the first downstream-side air-blowing wall 284 formed in the first downstream-side main face portion 282 blows the refrigerant 11 toward the radially inner side. That is, the first upstream-side air-blowing wall 283 blows the refrigerant 11 toward the radially outer side, and thereafter, the first downstream-side air-blowing wall 284 blows the refrigerant 11 toward the radially inner side, and thus, by blowing the refrigerant 11 toward both the first upstream-side main face portion 281 side and the first downstream-side main face portion 282 of the first fan 28, the refrigerant 11 can be compressed more effectively.

[0082] The above matters are also the same in the second fan 29. That is, the second upstream-side air-blowing wall 293 of the second fan 29 blows the refrigerant 11 toward the radially outer side, and the second downstream-side air-blowing wall 294 blows the refrigerant 11 toward the radially inner side. Thereby, the refrigerant 11 is further compressed, and the effect of increasing the pressure becomes greater.

[0083] Figure 6 is a front view of the first fan 28 of the scroll compressor 10 as viewed from the front.

[0084] Here, inside the first front-stage compression chamber 141, the first fan 28 is eccentrically disposed downward. In this way, in the vertical direction, the distance L20 of the lower end of the first fan 28 from the inner wall 27 is shorter than the distance L21 of the upper end portion of the fan 17 from the inner wall 27. For example, the ratio of L20 to L21 can be set to 2 / 3 or less, 1 / 2 or less.

[0085] Thus, it is possible to suppress the lubricating oil from remaining inside the first pre-stage compression chamber 141. Specifically, as described above, the scroll compressor 10 of the present embodiment is of the mist lubrication type. Therefore, by the operation of the scroll compressor 10, the lubricating oil contained in the refrigerant 11 is separated from the refrigerant 11 inside the first pre-stage compression chamber 141, and the lubricating oil sometimes accumulates in the lower end portion of the first pre-stage compression chamber 141. In Figure 6 the present embodiment, the lubricating oil accumulated in the lower end of the first pre-stage compression chamber 141 is indicated by a color block. If this state is maintained, the refrigerant 11 does not contain a sufficient amount of lubricating oil. Therefore, in the device having a movable portion in the vapor compression refrigeration cycle, such as the scroll compressor 10, and the like, sufficient lubrication cannot be performed, and the life of the device can be shortened.

[0086] In the present embodiment, the first side portion 285 is eccentrically arranged downward. Therefore, if the first fan 28 rotates at the time of the operation of the scroll compressor 10, the first upstream-side air supply wall 283 stirs the stored lubricating oil, and the lubricating oil becomes a mist state again inside the first pre-stage compression chamber 141 to be mixed with the refrigerant 11. Thus, it is possible to supply the lubricating oil in a mist state to each device of the vapor compression refrigeration cycle together with the refrigerant 11, and to extend the life of the device.

[0087] Figure 7 is a front view of the first fan 28 of another type of scroll compressor 10 viewed from the front.

[0088] Here, a protrusion portion 30 protruding toward the radial direction outside is formed in the outer peripheral surface of the first fan 28, that is, the first side portion 285. The protrusion portion 30 is arranged at substantially equal intervals in the circumferential direction of the first side portion 285. Here, in the vertical direction, the first fan 28 can be arranged at the center of the first pre-stage compression chamber 141, or can be eccentrically arranged downward as shown in Figure 7 Needless to say, the protrusion portion 30 is also referred to as an oil throw ring.

[0089] By having the protrusion portion 30, it is possible to make the lubricating oil accumulated in the lower portion of the first pre-stage compression chamber 141 into a mist state. Specifically, if the first fan 28 rotates at the time of the operation of the scroll compressor 10, the protrusion portion 30 stirs the stored lubricating oil, and the lubricating oil becomes a mist state again inside the first pre-stage compression chamber 141 to be mixed with the refrigerant 11. Thus, it is possible to supply the lubricating oil in a mist state to each device of the vapor compression refrigeration cycle together with the refrigerant 11, and to extend the life of the device.

[0090] The above describes the embodiments of the present application, but the present application is not limited thereto, and can be changed within the scope of the gist of the present application. In addition, each of the above-described modes can be combined with each other.

[0091] For example, refer toFigure 2 The motor 23 does not necessarily need to be built in the housing 31, and can be arranged outside the housing 31.

[0092] Explanation of Reference Numerals

[0093] 10: scroll compressor

[0094] 11: refrigerant

[0095] 12: partition wall

[0096] 13: suction port

[0097] 14: preliminary compression chamber

[0098] 141: first preliminary compression chamber

[0099] 142: second preliminary compression chamber

[0100] 15: fan housing

[0101] 16: motor housing

[0102] 17: fan

[0103] 18: shaft

[0104] 19: front chamber

[0105] 20: movable scroll

[0106] 21: fixed scroll

[0107] 22: compression space

[0108] 23: motor

[0109] 24: discharge port

[0110] 25: rotor

[0111] 26: stator

[0112] 261: stator core

[0113] 262: coil

[0114] 27: inner wall

[0115] 28: first fan

[0116] 281: first upstream side main face portion

[0117] 282: first downstream side main face portion

[0118] 283: first upstream side air supply wall

[0119] 284: first downstream side air supply wall

[0120] 285: first side surface portion

[0121] 286: first insertion hole

[0122] 29: second fan

[0123] 291: second upstream side main surface portion

[0124] 292: second downstream side main surface portion

[0125] 293: second upstream side air supply wall

[0126] 294: second downstream side air supply wall

[0127] 295: second side surface portion

[0128] 296: first insertion hole

[0129] 30: protrusion

[0130] 31: housing

[0131] 32: pre-stage inlet

[0132] 33: pre-stage outlet

Claims

1. A scroll compressor, which is a compressor that compresses a refrigerant used in a vapor compression refrigeration cycle, characterized by comprising: a fixed scroll; a movable scroll configured to be able to orbit with respect 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 mounted to the shaft; a pre-compression chamber that houses the fan, the fan and the pre-compression chamber are disposed at a position more upstream than the movable scroll in a flow path of the refrigerant.

2. The scroll compressor according to claim 1, characterized in that, the fan has a first fan and a second fan disposed at a position more downstream than the first fan, the pre-compression chamber has a first pre-compression chamber that houses the first fan and a second pre-compression chamber that houses the second fan.

3. The scroll compressor according to claim 1, characterized in that, the fan has a main face portion and a blow wall, the main face portion is a substantially circular face that extends in a direction orthogonal to an axial direction of the shaft, the blow wall is a portion that locally bulges the main face portion and extends in a wall shape toward an outer side in a radial direction.

4. The scroll compressor according to claim 3, characterized in that, the main face portion has an upstream side main face portion that faces an upstream side in the flow path of the refrigerant and a downstream side main face portion that faces a downstream side in the flow path of the refrigerant, the blow wall has an upstream side blow wall formed in the upstream side main face portion and a downstream side blow wall formed in the downstream side main face portion.

5. The scroll compressor according to claim 4, characterized in that, an intermediate portion of the upstream side blow wall is curved in a shape that bulges toward a rotation direction of the fan.

6. The scroll compressor according to claim 4 or 5, characterized in that, an intermediate portion of the downstream side blow wall is curved in a shape that is recessed toward a rotation direction of the fan.

7. The scroll compressor according to claim 1, characterized by further comprising a fan case that covers the fan, the pre-compression chamber is a space formed between an inner wall of the fan case and the fan, the fan has an upstream side main face portion that faces an upstream side in the flow path of the refrigerant, a downstream side main face portion that faces a downstream side in the flow path of the refrigerant, and a side face portion that faces an outer side in a radial direction, a thickness of a gap between the upstream side main face portion and the inner wall, a thickness of a gap between the downstream side main face portion and the inner wall, and a thickness of the side face portion with respect to the inner wall are substantially the same.

8. The scroll compressor according to claim 1, characterized in that, in a vertical direction, a distance from a lower end portion of the fan to the pre-compression chamber is shorter than a distance from an upper end portion of the fan to the pre-compression chamber.

9. The scroll compressor according to claim 1, characterized in that, a protruding portion that protrudes toward an outer side in a radial direction is formed in a side face portion of the fan. ​ ​ 10. The scroll compressor according to claim 1, wherein the fan casing is further provided, 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 side main surface portion facing an upstream side in the flow path of the refrigerant, a downstream side main surface portion facing a downstream side in the flow path of the refrigerant, and a side surface portion facing a radial direction outer side, in a case where a thickness of a gap between the upstream side main surface portion and the inner wall is set as L10, a thickness of a gap between the downstream side main surface portion and the inner wall is set as Ll l, and a thickness of a gap between the side surface portion and the inner wall is set as L12, if L10, Ll l, and L12 are compared, any one is 2 times or less of the other two.

11. A scroll compressor that compresses a refrigerant used in a vapor compression refrigeration cycle, the scroll compressor comprising: a fixed scroll; a movable scroll disposed so as to be able to orbit with respect 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 mounted to the shaft; and a pre-stage compression chamber that houses the fan, wherein the fan and the pre-stage compression chamber are disposed at a position upstream of the movable scroll in a flow path of the refrigerant, wherein the pre-stage compression chamber is a space formed between an inner wall of a fan casing and the fan, the fan having an upstream side main surface portion facing an upstream side in the flow path of the refrigerant, a downstream side main surface portion facing a downstream side in the flow path of the refrigerant, and a side surface portion facing a radial direction outer side, wherein in a case where a thickness of a gap between the upstream side main surface portion and the inner wall is set as L10, a thickness of a gap between the downstream side main surface portion and the inner wall is set as Ll l, and a thickness of a gap between the side surface portion and the inner wall is set as L12, if L10, Ll l, and L12 are compared, any one is 2 times or less of the other two.

11. A scroll compressor that compresses a refrigerant used in a vapor compression refrigeration cycle, the scroll compressor comprising: a fixed scroll; a movable scroll disposed so as to be able to orbit with respect 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 mounted to the shaft; and a pre-stage compression chamber that houses the fan, wherein the fan and the pre-stage compression chamber are disposed at a position upstream of the movable scroll in a flow path of the refrigerant, wherein the pre-stage compression chamber is a space formed between an inner wall of a fan casing and the fan, the fan having an upstream side main surface portion facing an upstream side in the flow path of the refrigerant, a downstream side main surface portion facing a downstream side in the flow path of the refrigerant, and a side surface portion facing a radial direction outer side, wherein in a case where a thickness of a gap between the upstream side main surface portion and the inner wall is set as L10, a thickness of a gap between the downstream side main surface portion and the inner wall is set as Ll l, and a thickness of a gap between the side surface portion and the inner wall is set as L12, if L10, Ll l, and L12 are compared, any one is 2 times or less of the other two.

11. A scroll compressor that compresses a refrigerant used in a vapor compression refrigeration cycle, the scroll compressor comprising: a fixed scroll; a movable scroll disposed so as to be able to orbit with respect 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 mounted to the shaft; and a pre-stage compression chamber that houses the fan, wherein the fan and the pre-stage compression chamber are disposed at a position upstream of the movable scroll in a flow path of the refrigerant, wherein the pre-stage compression chamber is a space formed between an inner wall of a fan casing and the fan, the fan having an upstream side main surface portion facing an upstream side in the flow path of the refrigerant, a downstream side main surface portion facing a downstream side in the flow path of the refrigerant, and a side surface portion facing a radial direction outer side, wherein in a case where a thickness of a gap between the upstream side main surface portion and the inner wall is set as L10, a thickness of a gap between the downstream side main surface portion and the inner wall is set as Ll l, and a thickness of a gap between the side surface portion and the inner wall is set as L12, if L10, Ll l, and L12 are compared, any one is 2 times or less of the other two.

11. A scroll compressor that compresses a refrigerant used in a vapor compression refrigeration cycle, the scroll compressor comprising: a fixed scroll; a movable scroll disposed so as to be able to orbit with respect 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 mounted to the shaft; and a pre-stage compression chamber that houses the fan, wherein the fan and the pre-stage compression chamber are disposed at a position upstream of the movable scroll in a flow path of the refrigerant, wherein the pre-stage compression chamber is a space formed between an inner wall of a fan casing and the fan, the fan having an upstream side main surface portion facing an upstream side in the flow path of the refrigerant, a downstream side main surface portion facing a downstream side in the flow path of the refrigerant, and a side surface portion facing a radial direction outer side, wherein in a case where a thickness of a gap between the upstream side main surface portion and the inner wall is set as L10, a thickness of a gap between the downstream side main surface portion and the inner wall is set as Ll l, and a thickness of a gap between the side surface portion and the inner wall is set as L12, if L10, Ll l, and L12 are compared, any one is 2 times or less of the other two.

12. The scroll compressor according to claim 11, wherein if L10, Ll l, and L12 are compared, any one is 1.5 times or less of the other two.

13. The scroll compressor according to claim 11, wherein if L10, Ll l, and L12 are compared, any one is 1.2 times or less of the other two.

14. A scroll compressor that compresses a refrigerant used in a vapor compression refrigeration cycle, the scroll compressor comprising: ​ ​ ​ provided with: a fixed scroll; a movable scroll disposed so as to be able to orbit with respect 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 mounted to the shaft; a pre-stage compression chamber that houses the fan, the fan and the pre-stage compression chamber are disposed at a position more upstream than the movable scroll in the flow path of the refrigerant, Further provided is a fan casing that covers the fan, the pre-stage compression chamber being a space formed between an inner wall of the fan casing and the fan, the fan having: an upstream-side main face portion that faces the upstream side of the flow path of the refrigerant; a downstream-side main face portion that faces the downstream side in the flow path of the refrigerant; a side face portion that faces the radial direction outer side, In a case where a thickness of a gap between the upstream-side main face portion and the inner wall is set as L10, a thickness of a gap between the downstream-side main face portion and the inner wall is set as L11, and a thickness of a gap between the side face portion and the inner wall is set as L12, if L10, L11, and L12 are compared, any one is 2 times or less of the other two, In the up-down direction, a distance of a lower end portion of the fan from the inner wall is shorter than a distance of an upper end portion of the fan from the inner wall.

15. The scroll compressor according to claim 14, wherein In a case where a distance of a lower end of the fan from the inner wall is set as L20, and a distance of an upper end of the fan from the inner wall is set as L21, a ratio of L20 with respect to L21 is 2 / 3 or less.

16. The scroll compressor according to claim 14, wherein In a case where a distance of a lower end of the fan from the inner wall is set as L20, and a distance of an upper end of the fan from the inner wall is set as L21, a ratio of L20 with respect to L21 is 1 / 2 or less.

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