Scroll compressor

Abstract

The utility model provides a scroll compressor, include: rear shell subassembly, rear shell subassembly includes rear shell and side wall, the central part of one end surface of rear shell is provided with shaft seat, bearing, the inner ring of bearing is set up in the outer periphery of shaft seat, connecting block and crankshaft, one end of connecting block is set up in the outer ring of bearing, the other end of connecting block is connected with one end of crankshaft, and connecting block rotates with the rotation of crankshaft. The utility model discloses the bearing of scroll compressor sets up in the outer periphery of shaft seat, and the one end of crankshaft is connected with the outer ring of bearing through connecting block, relative to the prior art that bearing is installed in the inner periphery of shaft seat, greatly reduces the area of shaft seat, increases the area of rear shell and refrigerant contact, thereby increases the cooling area of the power device of corresponding controller, realizes the better cooling of power device, further, sets up the through -hole as oil gas passage through the annular top of connecting block, makes oil gas can enter the inside of bearing on rear shell, realizes the lubrication and cooling of the bearing of rear shell.

Description

Technical Field

[0001] This utility model relates to the technical field of compressors, specifically to a scroll compressor. Background Technology

[0002] In traditional automotive scroll compressors, the crankshaft is fitted to the inner ring of the bearing, and the rear housing is fitted to the outer ring of the bearing. Because the rear housing bearing seat fits into the outer ring of the bearing, the bearing seat size is too large, which obstructs some power devices and thus affects the heat dissipation of the power devices in the controller.

[0003] Patent CN220850040U discloses a compressor for enhanced controller cooling. By installing a flow guide inside the rear housing, which is fixed to the rear housing by limiting pins, when the compressor starts running, the low-temperature, low-pressure refrigerant drawn in from the suction port is restricted axially and circumferentially by the axial and circumferential gas flow limiting baffles of the flow guide. The refrigerant flow direction changes from tangentially along the housing at the suction port to near the bottom of the housing and perpendicular to the housing axis. As the compressor operates, a continuous stream of low-temperature, low-pressure refrigerant flows through the bottom of the rear housing and its heat dissipation fins, continuously transferring heat from the controller chamber to the rear housing through convection heat transfer, thus cooling the controller and its chamber. However, because multiple power devices are shielded at the bottom of the bearing, the cooling effect is poor. Therefore, a flow guide is needed to improve the airflow direction and better cool the controller power devices. However, this approach not only increases the flow guide but also the limiting pins, significantly increasing the cost of the components.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] To address the problems in the existing technology, the purpose of this utility model is to provide a scroll compressor that reduces the area of ​​the bearing seat by setting the bearing on the outer periphery of the bearing seat, increases the contact area between the rear shell and the refrigerant, thereby increasing the cooling area of ​​the corresponding power device of the controller and achieving better cooling of the power device of the controller.

[0006] Specifically, this utility model provides a scroll compressor, comprising:

[0007] A rear housing assembly, the rear housing assembly including a rear housing and a sidewall connected to the rear housing, wherein a shaft seat is provided at the center of the end face of the rear housing facing the motor;

[0008] A bearing, wherein the inner ring of the bearing is fitted around the outer periphery of the bearing seat;

[0009] A connecting block and a crankshaft, one end of the connecting block being fitted onto the outer ring of the bearing, the other end of the connecting block being connected to one end of the crankshaft, and the connecting block rotating as the crankshaft rotates.

[0010] According to some examples of the present invention, the connecting block includes an annular top and a cylindrical portion connected to the annular top;

[0011] The cylindrical portion is clearance-fitted with the outer ring of the bearing;

[0012] The inner ring of the annular top is fixedly connected to the outer periphery of the connecting end of the crankshaft.

[0013] According to some examples of this utility model, the inner ring of the annular top is fixedly connected to the outer periphery of the connecting end of the crankshaft by a keyway structure.

[0014] According to some examples of this utility model, the radial dimension of the connecting end is smaller than the radial dimension of the crankshaft connected to the connecting end.

[0015] According to some examples of this utility model, the radial dimension of the connecting end is smaller than the radial dimension of the bearing seat.

[0016] According to some examples of this utility model, the height of the cylindrical portion in the axial direction of the crankshaft is less than the height of the bearing seat in the axial direction of the crankshaft.

[0017] According to some examples of this utility model, the annular top is provided with at least one through hole extending through its thickness.

[0018] According to some examples of this utility model, the connecting block is made of a metallic material.

[0019] According to some examples of this utility model, the inner ring of the bearing is interference-fitted with the outer circumference of the bearing housing.

[0020] According to some examples of the present invention, the scroll compressor further includes a rear cover plate and at least one power device. The rear cover plate is disposed on the side of the rear housing away from the motor and forms a chamber with the rear housing. The at least one power device is disposed on the end face of the rear housing away from the motor.

[0021] The bearing of the scroll compressor of this utility model is located on the outer periphery of the bearing seat. The crankshaft is connected to the outer ring of the bearing through a connecting block. Compared with the existing structure in which the bearing is installed on the inner periphery of the bearing seat, the area of ​​the bearing seat is greatly reduced, the contact area between the rear housing and the refrigerant is increased, thereby increasing the cooling area of ​​the power device of the corresponding controller and achieving better cooling of the power device of the controller. Furthermore, by setting a through hole at the top of the annular part of the connecting block as an oil and gas channel, oil and gas can enter the bearing inside the rear housing to achieve lubrication and cooling of the bearing in the rear housing. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. It is obvious that the drawings described below are merely some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings without inventive effort. Furthermore, the drawings are merely illustrative diagrams of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore, repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0023] Figure 1 This is a partial structural schematic diagram of a scroll compressor according to an embodiment of the present invention;

[0024] Figure 2 and Figure 3 These are schematic diagrams of the connector from different perspectives, representing an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the crankshaft structure according to an embodiment of the present invention;

[0026] Figure 5 This is a top view of the rear shell according to an embodiment of the present invention. Detailed Implementation

[0027] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed herein. This utility model can also be implemented or applied through other different specific embodiments. Various details in this utility model can also be modified or changed according to different viewpoints and application systems without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0028] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement it. This utility model can be embodied in many different forms and is not limited to the embodiments described herein.

[0029] In the representation of this utility model, 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 utility model. 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 utility model, as well as features of different embodiments or examples.

[0030] To clearly illustrate this utility model, components unrelated to the description are omitted, and the same or similar constituent elements throughout the specification are given the same reference numerals.

[0031] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0032] When we say that a device is "above" another device, this can mean that it is directly above the other device, or it can mean that other devices are present in between. Conversely, when we say that a device is "directly" "above" another device, there are no other devices present in between.

[0033] Although the terms first, second, etc., are used in some instances herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0034] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of the invention. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in this 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.

[0035] 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 invention pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with relevant technical documents and the content of this present instruction, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0036] The structure of the scroll compressor of this utility model is further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of this utility model.

[0037] This utility model provides a scroll compressor. Figure 1 This is a partial structural diagram of a scroll compressor according to an embodiment of the present invention. The compressor includes:

[0038] The rear housing assembly includes a rear housing 11 and a side wall 12 connected to the rear housing 11. The rear housing 11 and the side wall 12 form a space for accommodating the motor and the crankshaft 2. The motor includes a stator assembly 71 and a rotor assembly 72. A bearing seat 111 is provided at the center of the end face of the rear housing 11 facing the motor. The side wall 12 is typically provided with an air intake 8 through which low-temperature refrigerant gas is drawn in.

[0039] Bearing 3, the inner ring of bearing 3 is sleeved on the outer circumference of bearing seat 111, and the inner ring of bearing 3 and the outer circumference of bearing seat 111 can be connected by interference fit.

[0040] Connecting block 4 and crankshaft 2, one end of connecting block 4 is sleeved on the outer ring of bearing 3, the other end of connecting block 4 is connected to one end of crankshaft 2, and connecting block 4 rotates with crankshaft 2.

[0041] In one embodiment, the structures of the connecting block 4 and the crankshaft 2 are as follows: Figure 2 and Figure 3 as well as Figure 4 As shown, the connecting block 4 includes an annular top 41 and a cylindrical part 42 connected to the annular top 41. The cylindrical part 42 is clearance-fitted with the outer ring of the bearing 3. One end of the crankshaft 2 does not abut against the end face of the bearing seat 111. The outer periphery of this end is the connecting end 21 of the crankshaft 2. The inner ring of the annular top 41 is fixedly connected to the outer periphery of the connecting end 21 of the crankshaft 2.

[0042] The inner ring of the annular top 41 and the outer circumference of the connecting end 21 of the crankshaft 2 can be connected by an interference fit. Alternatively, the inner ring of the annular top 41 and the outer circumference of the connecting end 21 of the crankshaft 2 can be fixedly connected by a keyway structure. Specifically, the inner ring 411 of the annular top 41 can have a protruding key structure, and the outer circumference of the connecting end 21 of the crankshaft 2 has a groove structure that matches the key structure; or vice versa, the outer circumference of the connecting end 21 of the crankshaft 2 has a protruding key structure, and the inner ring 411 of the annular top 41 has a groove structure that matches the key structure. The cross-section of the key structure or groove structure is non-circular, i.e., the cross-section of the key structure or groove structure is polygonal, such as rectangular, square, or trapezoidal. The key structure and groove structure can fit together; when the crankshaft 2 rotates, the connecting block 4 rotates through the mutual cooperation of the key structure and groove structure. The connecting block 4 can be made of a metal material that is easy to process, and the metal connecting block 4 can also ensure the connection strength between the crankshaft and the metal material.

[0043] In this embodiment, the radial dimension of the connecting end 21 of the crankshaft 2 can be smaller than the radial dimension of the crankshaft 2 connected to the connecting end. Here, "radial dimension" refers to the distance between the two farthest points on the cross-section. Taking the cross-section of the connecting end 21 as a circle as an example, the radial dimension of the connecting end 21 is the diameter of the connecting end 21. Furthermore, the radial dimension of the connecting end 21 can be smaller than the radial dimension of the bearing seat 111. Because the bearing seat of this invention is changed from the existing fit with the outer ring of the bearing to the fit with the inner ring of the bearing, that is, the inner ring of the bearing 3 is located outside the bearing seat 111, and the outer diameter of the bearing seat 111 is the diameter of the inner ring of the bearing 3, whereas in the existing structure, the bearing is located inside the bearing seat, and the minimum outer diameter of the bearing seat is the sum of the diameter of the outer ring of the bearing and twice the thickness of the side wall of the bearing seat (generally greater than 8 mm). The cross-section of the bearing seat in the existing structure is limited by the size of the bearing (the diameter of the inner ring / outer ring) which is much larger than the cross-section of the bearing seat of this invention.

[0044] Furthermore, the height of the cylindrical portion 42 of the connecting block 4 in the axial direction of the crankshaft is less than the height of the bearing seat 111 in the axial direction of the crankshaft. In one embodiment, the annular top 41 of the connecting block 4 may be provided with one or more through holes 412 penetrating its thickness. At this time, when the compressor is running, the low-temperature and low-pressure refrigerant carrying oil mist flows through the lower part of the connecting block 4. The crankshaft 2 drives the connecting block 4 and the bearing 3 to continuously rotate circumferentially. According to Bernoulli's principle, in the process of fluid flow, the pressure is low where the flow velocity is high. Under the action of centrifugal force, the gas flow velocity is relatively slow and the pressure is relatively high in the region near the center of rotation, while the pressure is relatively high in the region far from the center. This causes the refrigerant mixed with oil mist to move towards the outer ring of the bearing 3. At the same time, the gas entering from the bottom is affected by the negative pressure at the center. While the gas moves towards the outside of the bearing 3, it will gradually move towards the upper side. Due to the continuity of fluid movement, the refrigerant carrying oil mist will flow out from the through hole 412 at the top of the connecting block 4, realizing the lubrication and cooling of the bearing 3, thereby improving the reliability and operating range of the compressor as a whole.

[0045] The scroll compressor also includes a rear cover (not shown in the figure) and at least one power device 9. The rear cover is disposed on the side of the rear housing 11 away from the motor and forms a chamber with the rear housing. The at least one power device 9 is disposed on the end face of the rear housing 11 away from the motor.

[0046] Power devices are the main heat-generating modules in the controller of a scroll compressor. Figure 5This is a top view of the rear housing according to an embodiment of the present invention. To improve the cooling effect on the power devices 9 on the side of the rear housing 11 facing away from the motor, multiple guide ribs 112 can be provided on the surface of the rear housing facing the motor. These guide ribs 112 can be located on the back of the rear housing corresponding to the multiple power devices 9. The guide ribs 112 can extend from the suction port 8 of the scroll compressor towards the bearing seat 111, and the extended ends of the guide ribs 112 can be distributed on both sides of the bearing seat 111. In this case, because the bearing seat diameter of the scroll compressor of the present invention is smaller, only 4.2% of the area of ​​the multiple power devices can be covered at the bottom of the bearing seat 111. When the compressor starts running, low-temperature, low-pressure refrigerant enters from the compressor suction port 8 and, influenced by the internal guide ribs 112 of the compressor's rear housing 11, is diverted to both sides to cool all the power devices of the controller, solving the problem of poor cooling effect caused by the traditional bearing seat blocking multiple power devices.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0048] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A scroll compressor, characterized in that, include: A rear housing assembly, the rear housing assembly including a rear housing and a sidewall connected to the rear housing, wherein a shaft seat is provided at the center of the end face of the rear housing facing the motor; A bearing, wherein the inner ring of the bearing is fitted around the outer periphery of the bearing seat; A connecting block and a crankshaft, one end of the connecting block being fitted onto the outer ring of the bearing, the other end of the connecting block being connected to one end of the crankshaft, and the connecting block rotating as the crankshaft rotates.

2. The scroll compressor according to claim 1, characterized in that, The connecting block includes an annular top and a cylindrical portion connected to the annular top; The cylindrical portion is clearance-fitted with the outer ring of the bearing; The inner ring of the annular top is fixedly connected to the outer periphery of the connecting end of the crankshaft.

3. The scroll compressor according to claim 2, characterized in that, The inner ring of the annular top is fixedly connected to the outer periphery of the crankshaft connection end by a keyway structure.

4. The scroll compressor according to claim 3, characterized in that, The radial dimension of the connecting end is smaller than the radial dimension of the crankshaft connected to the connecting end.

5. The scroll compressor according to claim 2, characterized in that, The radial dimension of the connecting end is smaller than the radial dimension of the bearing seat.

6. The scroll compressor according to claim 2, characterized in that, The height of the cylindrical portion in the axial direction of the crankshaft is less than the height of the bearing seat in the axial direction of the crankshaft.

7. The scroll compressor according to claim 2, characterized in that, The annular top is provided with at least one through hole that extends through its thickness.

8. The scroll compressor according to claim 1, characterized in that, The connecting block is made of metal.

9. The scroll compressor according to claim 1, characterized in that, The inner ring of the bearing is interference-fitted with the outer circumference of the bearing housing.

10. The scroll compressor according to claim 1, characterized in that, It also includes a rear cover plate and at least one power device. The rear cover plate is disposed on the side of the rear housing away from the motor and forms a cavity with the rear housing. The at least one power device is disposed on the end face of the rear housing away from the motor.

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