Scroll compressor

Abstract

The invention provides a scroll compressor which comprises a rear shell, a motor and a middle shell, a plurality of limiting steps and a plurality of flow guide grooves which extend in the axial direction and are arranged at intervals in the circumferential direction are arranged on the inner circumference of the first side of the rear shell, and each limiting step at least comprises a radial receding part, a radial limiting part and a motor thrust surface which are sequentially heightened; the motor is stopped on the motor thrust surface, the periphery of an iron core of the motor is provided with a plurality of through-flow grooves formed in a concave mode, the through-flow grooves are communicated with the flow guide grooves respectively, and the radial limiting part is in clearance fit with the periphery of the iron core so as to provide radial limiting for the motor; the middle shell is in threaded connection with the rear shell and presses the motor on the rear shell, the lower end of the middle shell is provided with elastic piece supporting parts, the elastic piece supporting parts are elastically pressed on the outer edge of an iron core of the motor through elastic pieces, and gaps between the elastic piece supporting parts form radial through-flow grooves for refrigerant circulation. The sealing performance of the shell can be guaranteed, the situation that motor noise is directly transmitted out of the compressor is reduced, and the overall size of the compressor can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration equipment, in particular to a scroll compressor. BACKGROUND

[0002] The scroll compressor for vehicle can be divided into hot sleeve fixed type and bolt fixed type according to the fixing mode of the motor. The hot sleeve fixed scheme has advantages in the size of the finished compressor, but during the process of shell heating and motor hot sleeve, there is a probability that the infiltration layer of the shell will be damaged, thereby causing problems in the sealing of the compressor. Moreover, due to the direct large-area contact between the motor and the shell, the noise is directly transmitted to the outside through the shell, and the noise on the outside of the motor is not good. The bolt fixed scheme is better in motor side noise and shell sealing, but due to the millimeter level gap between the motor and the shell, the size of the shell will be larger, which has disadvantages in the system matching of the customer.

[0003] For example: a scroll compressor structure is disclosed in patent CN213016782U, which is different from the general motor fixed to the shell (middle shell) through bolts at the main bearing. The patent makes bolt holes at the bottom of the shell (rear shell) at the vice bearing, and makes a step inside the rear shell. The lower end of the step is used to provide rough positioning of the motor, and the upper side of the step forms a clearance between the motor and the shell, which can reduce the direct transmission of noise and effectively control the size of the compressor. The sealing of the compressor can be guaranteed. The step hole scheme proposed in CN213016782U can control the radial gap to be very small, but the motor itself will be larger than the motor without bolt holes due to the bolt holes, and the size of the compressor will still be larger than the non-bolt fixed motor, which has a congenital disadvantage in product boundary and customer matching.

[0004] Therefore, the present application provides a scroll compressor. SUMMARY

[0005] In view of the problems in the prior art, the present application aims to provide a scroll compressor that overcomes the difficulties of the prior art and can fix the motor radially by setting a step and an elastic member on the shell, thereby guaranteeing the sealing of the shell, reducing the direct transmission of motor noise out of the compressor, and effectively reducing the overall size of the compressor.

[0006] Embodiments of the present application provide a scroll compressor, comprising:

[0007] The first side of the rear shell is provided with a plurality of limiting steps and a plurality of flow guide grooves extending in the axial direction and arranged in the circumferential direction, and the limiting steps at least include a radial avoidance portion, a radial limiting portion and a motor thrust surface in the first direction in order of increasing protrusion height;

[0008] a motor entering a first side of the rear shell along a first direction, and being stopped at the motor thrust face after passing through the radial avoiding part to position the motor axially, an outer periphery of an iron core of the motor being provided with a plurality of concave flow channels, the outer periphery of the iron core being supported by the motor thrust face, the flow channels being communicated with the flow guide grooves respectively, the radial limiting part being engaged with the outer periphery of the iron core to provide radial limiting of the motor;

[0009] a middle shell screwing the rear shell and pressing the motor against the rear shell, a lower end of the middle shell being provided with a plurality of elastic member supporting parts arranged in a circumferential direction and protruding downward, the elastic member supporting parts being elastically pressed against the outer edge of the iron core of the motor by elastic members, gaps between the elastic member supporting parts forming radial flow channels, part of the refrigerant entering the middle shell from the suction side of the rear shell flowing into the middle shell and the motor through the flow channels and the radial flow channels in sequence.

[0010] Preferably, the middle shell is further provided with a plurality of axial flow channels communicated with the radial flow channels.

[0011] Preferably, the inner periphery of the first side of the rear shell further comprises a circumferential limiting part embedded in any one of the flow channels to provide circumferential limiting of the motor.

[0012] Preferably, the elastic member supporting parts are protruding tooth type supporting plates integrally formed by the outer shell of the middle shell.

[0013] Preferably, the flow guide grooves comprise an axial flow channel and a flow channel entrance formed in the first direction in sequence.

[0014] Preferably, the axial flow channel is a gentle slope clamped between the limiting steps, and the flow channel entrance is an outwardly expanding steep slope, a first included angle between the steep slope and the inner wall of the rear shell being larger than a second included angle between the gentle slope and the inner wall of the rear shell.

[0015] Preferably, the motor thrust face is formed at a bottom edge of the radial limiting part, a radius of a circle enclosed by the motor thrust face being smaller than a radius of a circle enclosed by the radial limiting part, and the radius of the circle enclosed by the radial limiting part being smaller than a radius of a circle enclosed by the radial avoiding part.

[0016] Preferably, the motor further comprises a winding framework, a winding and a lead wire.

[0017] The winding is wound on the winding framework, the iron core is formed with an iron core rear end and an iron core front end in the axial direction respectively, and the lead wire is arranged at the iron core rear end.

[0018] Preferably, the outer periphery of the rear end of the iron core is supported by the motor thrust face, and the outer periphery of the front end of the iron core is crimped by the elastic piece support part.

[0019] Preferably, the elastic piece is a disc spring or a wave spring.

[0020] The scroll compressor of the present application can radially fix the motor by setting a step on the housing and an elastic piece, which can ensure the sealing of the housing, reduce the direct transmission of motor noise out of the compressor, and effectively reduce the overall size of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0021] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof, read in conjunction with the accompanying drawings.

[0022] Figure 1 is a sectional view of a scroll compressor of the present application.

[0023] Figure 2 is a sectional view of a rear housing of a scroll compressor of the present application.

[0024] Figure 3 is a perspective view of a rear housing of a scroll compressor of the present application.

[0025] Figure 4 is a perspective view of a motor of a scroll compressor of the present application.

[0026] Figure 5 is a perspective view of a middle housing of a motor of a scroll compressor of the present application.

[0027] Figure 6 is a perspective view of a disc spring of a scroll compressor of the present application.

[0028] REFERENCE NUMERALS

[0029] 1 rear housing

[0030] 11 axial flow passage groove

[0031] 12 radial avoidance groove

[0032] 13 circumferential limiting part

[0033] 14 radial limiting part

[0034] 15 motor thrust face

[0035] 16 flow passage groove inlet

[0036] 2 motor

[0037] 21 wire winding framework

[0038] 22 wire winding

[0039] 23 Iron core

[0040] 24 leads

[0041] 25 Iron core rear end

[0042] 26 Flow channels

[0043] 27. Front end of iron core

[0044] 3. Middle Shell

[0045] 31 Radial flow channel

[0046] 32 Elastic Support Part

[0047] 33 Axial flow channel

[0048] 4 Disc Springs Detailed Implementation

[0049] The following specific examples illustrate the implementation methods of this application. Those skilled in the art can easily understand the other advantages and effects of this application from the content disclosed herein. This application can also be implemented or applied through other different specific embodiments, and various details in this application can be modified or changed according to different viewpoints and application systems without departing from the spirit of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0050] The embodiments of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the application. This application may be embodied in many different forms and is not limited to the embodiments described herein.

[0051] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0052] Furthermore, the terms "first", "second", etc. are used herein only to distinguish one identification entity from another identification entity, do not imply a relative importance or a specific order of corresponding described features, and do not imply a limitation on a number of objects to which the identification entity applies (i.e., a single object or several objects belong to one identification entity). Thus, the identification entity having the "first", "second" attribute can explicitly or implicitly include at least one of the corresponding features, unless otherwise specified. In the description of the present application, the meaning of the term "a plurality" is two or more, unless otherwise specifically defined.

[0053] For the purpose of clearness of the present application, devices irrelevant to the description are omitted, and the same reference numerals are given to the same or similar constituent elements throughout the description.

[0054] Throughout the specification, when it is said that an element is "connected" to another element, this includes not only the case of "direct connection" but also the case of "indirect connection" in which other elements are interposed therebetween. In addition, when it is said that an element "includes" a constituent element, unless otherwise specifically stated, other constituent elements are not excluded but it means that other constituent elements can be further included.

[0055] When it is said that an element is "on" another element, this can be directly on the other element, but can also be accompanied by other elements therebetween. When it is said in contrast that an element is "directly on" another element, there are no other elements accompanied therebetween.

[0056] Although the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are distinguished from each other. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", when used herein, specify the presence of stated features, steps, operations, elements, components, items, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, items, and / or groups thereof. As used herein, the terms "or" and "and / or" are to be interpreted as inclusive, i.e., as meaning one or any combination of items. Thus, "A, B or C" or "A, B and / or C" means any of the following: A; B; C; A and B; A and C; B and C; A, B and C. An exception to this definition will occur only when a combination of elements, functions, steps or acts are in some way inherently mutually exclusive.

[0057] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of this application. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in the specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0058] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with the relevant technical literature and the content of this present application, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0059] Figure 1 This is a cross-sectional view of a scroll compressor according to the present invention. Figure 2 This is a cross-sectional view of the rear casing of a scroll compressor according to the present invention. Figure 3 This is a perspective view of the rear housing of a scroll compressor according to the present invention. Figure 4 This is a perspective view of the motor of a scroll compressor according to the present invention. Figure 5 This is a perspective view of the inner casing of the motor of a scroll compressor according to the present invention. Figure 6 This is a perspective view of a disc spring in a scroll compressor according to the present invention. Figures 1 to 6 As shown, a scroll compressor of the present invention includes: a rear housing 1, a motor 2, and a middle housing 3. The inner circumference of the first side of the rear housing 1 is provided with a plurality of limiting steps extending axially and spaced circumferentially, and a plurality of guide grooves. The limiting steps include at least a radial clearance portion 12, a radial limiting portion 14, and a motor thrust surface 15, whose protrusion height increases sequentially along a first direction. The motor 2 enters the first side of the rear housing 1 along the first direction, passes through the radial clearance portion 12, and is stopped by the motor thrust surface 15 to axially position the motor 2. The outer circumference of the iron core 23 of the motor 2 is provided with a plurality of concave flow channels 26, which communicate with the guide grooves. The radial limiting portion 14 is clearance-fitted with the outer circumference of the iron core 23 to provide radial limiting of the motor 2. The middle shell 3 is screwed to the rear shell 1 and presses the motor 2 tightly against the rear shell 1. The lower end of the middle shell 3 is provided with several circumferentially spaced and downwardly protruding elastic support portions 32. These elastic support portions 32 are elastically pressed against the outer edge of the motor 2's iron core by elastic elements 4. The gaps between the elastic support portions 32 form radial flow channels 31. A portion of the refrigerant entering from the suction side of the rear shell 1 flows sequentially through the flow channels 26 and the radial flow channels 31 into the middle shell 3 and the interior of the motor 2. The combination of the limiting step and the guide channel in this invention not only provides accurate support and alignment for the motor but also provides drainage for the flow channels 26 around the motor 2, enhancing the overall lubrication effect.

[0060] In a preferred embodiment, the inner part of the middle shell 3 is further provided with a plurality of axial flow-through grooves 33, which are in communication with the radial flow-through grooves 31, but not limited thereto.

[0061] In a preferred embodiment, the inner periphery of the first side of the rear shell 1 is further provided with a circumferential limiting part 13, which is embedded in any one of the flow-through grooves 26 to provide circumferential limiting of the motor 2, but not limited thereto.

[0062] In a preferred embodiment, the elastic member support part 32 is a convex tooth type support plate formed integrally with the outer shell of the middle shell 3, but not limited thereto.

[0063] In a preferred embodiment, the flow guide groove comprises the axial flow-through groove 11 and the flow-through groove entrance 16 formed in the first direction in sequence, but not limited thereto.

[0064] In a preferred embodiment, the axial flow-through groove 11 is a gentle slope clamped between limiting steps, and the flow-through groove entrance 16 is an outwardly expanding steep slope, and the first included angle between the steep slope and the inner wall of the rear shell is greater than the second included angle between the gentle slope and the inner wall of the rear shell, but not limited thereto.

[0065] In a preferred embodiment, the motor thrust face 15 is formed at the bottom edge of the radial limiting part 14, and the radius of the circle enclosed by the motor thrust face 15 is smaller than the radius of the circle enclosed by the radial limiting part 14, and the radius of the circle enclosed by the radial limiting part 14 is smaller than the radius of the circle enclosed by the radial avoiding part 12, but not limited thereto.

[0066] In a preferred embodiment, the motor 2 further comprises a winding framework 21, a winding 22 and a lead wire 24. The winding 22 is wound on the winding framework 21, the core is formed with a core rear end 25 and a core front end 27 in the axial direction, and the lead wire 24 is arranged at the core rear end 25, but not limited thereto.

[0067] In a preferred embodiment, the outer periphery of the core rear end 25 is supported by the motor thrust face 15, and the outer periphery of the core front end 27 is crimped by the elastic member support part 32, but not limited thereto.

[0068] In a preferred embodiment, the elastic member 4 is a disc spring or a wave spring, but not limited thereto.

[0069] The application adopts the motor without bolt through hole, and sets the step on the motor matching position of the shell to perform the radial rough fixing of the motor, and the disc spring or the wave spring is used to perform the axial fixing and the radial reinforcing fixing of the motor. One end of the disc spring in the application is supported by the protruding part of the middle shell, the other side is attached to the front end surface of the motor, and is clamped between the two to form the elastic force, so as to fix the motor. Since the through flow groove provided on the motor is blocked by the disc spring, the through flow groove also needs to be provided on the shell to flow the refrigerant, and the protruding part supporting the disc spring cannot be the complete ring structure, and needs to have the gap to flow the refrigerant.

[0070] The specific implementation of the application is as follows:

[0071] With reference to the foregoing description Figures 1 to 6The present invention discloses a scroll compressor, comprising: a rear housing 1, a motor 2, and a middle housing 3. The inner circumference of the first side of the rear housing 1 is provided with a plurality of limiting steps (a stepped combination formed by radial clearance portions 12, radial limiting portions 14, and a motor thrust surface 15) extending axially and spaced circumferentially, and a plurality of guide grooves (in the present invention, the guide grooves are U-shaped cross-section drainage channels formed by the strip-shaped gaps between the limiting steps and the inner wall of the rear housing 1, without the need for additional trenching). The limiting steps include at least the radial clearance portions 12, the radial limiting portions 14, and the motor thrust surface 15, whose protrusion height increases sequentially along a first direction. Motor 2 enters the first side of the rear housing 1 along the first direction, passes through the radial clearance part 12, and is stopped at the motor thrust surface 15 to axially position motor 2. The outer periphery of the iron core 23 of motor 2 is provided with several concave flow channels 26, which are respectively connected to the guide channels. The radial limiting part 14 is clearance-fitted with the outer periphery of the iron core 23 to provide radial limiting for motor 2. The middle housing 3 is screwed to the rear housing 1 and presses motor 2 to the rear housing 1. The lower end of the middle housing 3 is provided with several elastic support parts 32 arranged circumferentially and protruding downwards. The elastic support parts 32 are elastically pressed against the outer edge of the iron core of motor 2 by elastic parts 4. The gap between the elastic support parts 32 forms a radial flow channel 31. Part of the refrigerant entering from the suction side of the rear housing 1 flows into the middle housing 3 and the interior of motor 2 after passing through the flow channels 26 and the radial flow channels 31 in sequence. The interior of the middle housing 3 is also provided with several axial flow channels 33, which are connected to the radial flow channels 31. The inner periphery of the first side of the rear shell 1 also includes a circumferential limiting portion 13, which is embedded in any of the flow channels 26 to provide circumferential limiting for the motor 2. The elastic member support portion 32 is a toothed support plate integrally formed from the outer shell of the middle shell 3. The flow channel includes an axial flow channel 11 and a flow channel inlet 16 formed sequentially along a first direction. The axial flow channel 11 is a gentle slope sandwiched between the limiting steps, and the flow channel inlet 16 is an outwardly expanding steep slope. The first included angle between the steep slope and the inner wall of the rear shell is greater than the second included angle between the gentle slope and the inner wall of the rear shell. The motor thrust surface 15 is formed at the bottom edge of the radial limiting portion 14. The radius of the circle formed by the motor thrust surface 15 is smaller than the radius of the circle formed by the radial limiting portion 14, and the radius of the circle formed by the radial limiting portion 14 is smaller than the radius of the circle formed by the radial clearance portion 12. The motor 2 also includes a winding frame 21, a winding 22, and a lead wire 24. The winding 22 is wound around the winding frame 21. The iron core forms a rear end 25 and a front end 27 along the axial direction, and the lead wire 24 is set at the rear end 25. The elastic support part 32 is pressed into the outer periphery of the rear end 25, and the outer periphery of the front end 27 is supported by the motor thrust surface 15. The elastic element 4 is a disc spring.

[0072] The following section describes the main features of each component in conjunction with each image. Figure 2 and 3The rear shell 1 of the present application has the following features: the motor thrust face 15 serves to limit the axial direction of the motor 2; the side of the motor thrust face 15 is provided with a radial limiting portion for providing a radial rough limit for the motor 2, the inner diameter of the radial limiting portion is designed based on the outer diameter of the motor 2 to ensure a small assembly gap, and the axial length of the limiting portion does not need to be long, and the radial limiting portion can provide radial limiting; the radial limiting portion 14 and the radial avoiding portion 12 with a larger inner diameter are connected by a large-angle chamfer; the inner side of the rear shell 1 is provided with an axial flow guide groove (the combination of the axial flow-through groove 11 and the flow-through groove inlet 16), which extends to the lower side of the motor thrust face, so that the refrigerant can enter the flow-through groove through the inlet; the inner side of the shell is provided with a circumferential limiting portion 13 (a protruding column in the rear shell 1) with a cross-sectional shape consistent with the axial flow-through groove of the motor, and the size of the protruding column is slightly smaller than the cross-sectional size of the flow-through groove, thereby providing circumferential positioning of the motor.

[0073] Figure 3 The middle shell 3 of the present application has the following features: the elastic member support portions 32 are uniformly arranged on the side of the middle shell 3 facing the rear shell 1, and the end faces of the elastic member support portions 32 are flat or have a tilt angle, and the angle is approximately equal to the angle of the disc spring when it is compressed, thereby providing uniform pressure on the disc spring and allowing the disc spring to be pressed between the middle shell 3 and the motor 2; the elastic member support portions 32 are provided with radial flow-through grooves 31 therebetween; and the elastic member support portions 32 are provided with axial flow-through grooves 33 on the side close to the center of the shell.

[0074] Figure 4 The motor 2 of the present application has a bolt-free through hole structure, and is provided with an axial flow-through groove 26 on the side, the rear end 25 of the iron core is provided with a side for abutting against the motor thrust face 15 of the rear shell 1, and the front end 27 of the iron core is provided with a side for abutting against the disc spring.

[0075] Figure 5 The disc spring 4 used in the present application has a structure in which the maximum outer diameter after deformation is not greater than the outer diameter of the motor iron core, and the minimum inner diameter after deformation is greater than the wire winding framework of the motor.

[0076] Reference Figure 1 , Figure 1For the assembly relationship and working principle of the main components of the present application, the motor 2 is mounted into the rear shell 1 along the inner side of the rear shell 1, the rear end 25 of the motor core of the motor 2 is supported on the motor thrust surface 15 of the rear shell 1, and the motor 2 is preliminarily limited in the radial direction by the small gap in the radial direction between the motor 2 and the rear shell 1, and the motor 2 is circumferentially limited by the through-flow groove 26 of the motor 2 and the circumferential limiting part 13 (a protruding column) of the rear shell 1. The disc spring (or wave spring) is placed on the front end 27 of the motor core, the middle shell 3 and the rear shell 1 are aligned and then mounted, and the subsequent installation of the compressor components is completed until the compressor is assembled. When the compressor is working, the refrigerant advances along the through-flow groove 26 between the rear shell 1 and the motor 2 from the suction side of the compressor, passes through the gap between the disc spring and the rear shell 1, and then enters the radial through-flow groove 31 between the middle shell 3 and the motor 2, the axial through-flow groove 33 of the middle shell 3, and the suction port of the compressor scroll to perform refrigerant compression (the main flow direction of the refrigerant is indicated by the arrow L). Figure 1

[0077] Due to the above structural features, the present application has the following technical advantages:

[0078] 1. Avoiding the damage of the infiltration layer caused by shrinkage fitting, reducing the defective rate in the production process, improving the production efficiency, and reducing the cost.

[0079] 2. Compared with the shrinkage fitting motor scheme, the contact area of the motor and the shell is reduced, and the noise transmission between the shell and the motor can be effectively reduced.

[0080] 3. Compared with the bolted motor, the radial size of the compressor can be better controlled, and the system matching is more advantageous.

[0081] In summary, the present application aims to provide a scroll compressor which can fix the motor in the radial direction by setting a step on the shell and an elastic member, thereby ensuring the sealing of the shell, reducing the direct transmission of motor noise out of the compressor, and effectively reducing the overall size of the compressor.

[0082] The above content is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.​

Claims

1. A scroll compressor characterized by, The application relates to a refrigeration compressor, which comprises: a rear shell (1), the inner periphery of the first side of the rear shell (1) is provided with a plurality of limiting steps and a plurality of guide grooves which are arranged along the axial direction and the circumferential direction, the limiting steps at least include a radial avoiding part (12), a radial limiting part (14) and a motor thrust surface (15) which are sequentially increased in the first direction; a motor (2) which enters the first side of the rear shell (1) along the first direction, is stopped at the motor thrust surface (15) after passing through the radial avoiding part (12) to position the motor (2) in the axial direction, the outer periphery of the core (23) of the motor (2) is provided with a plurality of concave flow-through grooves (26), the flow-through grooves (26) are communicated with the guide grooves respectively, the radial limiting part (14) is matched with the outer periphery of the core (23) to provide radial limiting of the motor (2); a middle shell (3) which is screwed with the rear shell (1) and presses the motor (2) to the rear shell (1), the lower end of the middle shell (3) is provided with a plurality of elastic piece supporting parts (32) which are arranged along the circumferential direction and are protruded downward, the elastic piece supporting parts (32) are elastically pressed to the outer edge of the core of the motor (2) through elastic pieces (4), the gap between the elastic piece supporting parts (32) forms a radial flow-through groove (31), part of the refrigerant which enters the suction side of the rear shell (1) sequentially passes through the flow-through grooves (26) and the radial flow-through groove (31) and then flows to the inside of the middle shell (3) and the motor (2).

2. A scroll compressor as set forth in claim 1 wherein, The inside of the middle shell (3) is further provided with a plurality of axial flow-through grooves (33) which are communicated with the radial flow-through groove (31).

3. A scroll compressor as set forth in claim 1 wherein, The inner periphery of the first side of the rear shell (1) further includes a circumferential limiting part (13) which is embedded in any one of the flow-through grooves (26) to provide circumferential limiting of the motor (2).

4. A scroll compressor as set forth in claim 1 wherein, The elastic piece supporting parts (32) are protruding tooth type supporting plates which are integrally formed by the outer shell of the middle shell (3).

5. A scroll compressor as set forth in claim 1 wherein, The guide grooves include an axial flow-through groove (11) and a flow-through groove entrance (16) which are sequentially formed in the first direction.

6. A scroll compressor as set forth in claim 5 wherein, The axial flow-through groove (11) is a gentle slope which is clamped between the limiting steps, the flow-through groove entrance (16) is an outward expanding type steep slope, the first included angle between the steep slope and the inner wall of the rear shell is larger than the second included angle between the gentle slope and the inner wall of the rear shell.

7. A scroll compressor as set forth in claim 1 wherein, The motor thrust surface (15) is formed at the bottom edge of the radial limiting part (14), the motor thrust surface (15) encloses a circle with a radius which is smaller than the radius of a circle enclosed by the radial limiting part (14), and the radius of a circle enclosed by the radial limiting part (14) is smaller than the radius of a circle enclosed by the radial avoiding part (12).

8. A scroll compressor as set forth in claim 1 wherein, The motor (2) further includes a winding framework (21), a winding (22) and a lead wire (24); The winding (22) is wound on the winding framework (21), the core is formed with a core rear end (25) and a core front end (27) in the axial direction respectively, and the lead wire (24) is arranged at the core rear end (25).

9. A scroll compressor as set forth in claim 8 wherein, The outer periphery of the iron core rear end (25) is supported by the motor thrust face (15), and the outer periphery of the iron core front end (27) is pressed by the elastic member support portion (32).

10. A scroll compressor as set forth in claim 1 wherein, The elastic member (4) is a disc spring or a wave spring.

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