Scroll compressor and vehicle-mounted air conditioning system

Abstract

The utility model provides a scroll compressor and a vehicle-mounted air conditioning system. The scroll compressor (100) comprises an end cover (1), a scroll plate assembly (2) and a bearing seat (3), a throttling channel (11) is formed in the end cover (1), a through hole (21) is formed in the scroll plate assembly (2), a through opening (31) is formed in the bearing seat (3), the throttling channel (11), the through hole (21) and the through opening (31) are sequentially communicated, the through opening (31) is communicated to a bearing cavity (32) of the bearing seat (3), the scroll compressor (100) further comprises a throttling element (4), and the throttling element (4) is arranged in the bearing cavity (32) of the bearing seat (3). The throttling element (4) is arranged in the throttling channel (11), and lubricating oil of the scroll compressor (100) flows into the through hole (21) through the throttling element (4). The present disclosure provides a novel throttling element design that can support lubricating oil circulation in a scroll compressor in a cost-effective manner.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compressors, and more particularly, to scroll compressors and vehicle air conditioning systems. Background Art

[0002] This section aims to provide background information related to understanding the various technologies described herein. As implied by the title of this section, this is a discussion of related technologies that should in no way be construed as necessarily being prior art. Therefore, it should be understood that any statement in this section should be read from this perspective and not as any admission of prior art.

[0003] In some technical solutions of electric compressors, the electric compressor throttle element for the oil (after oil-gas separation) from the outlet of the electric compressor is located at the stationary scroll or the wear-resistant plate of the stationary scroll or the bearing housing component. Due to the high requirements for the performance of the throttle element, a good and economical design is needed, but the design space for the throttle element is limited. For example, the structure of the stationary scroll and the size of the components will increase, resulting in an increase in the cost and mass of the entire electric compressor. Summary of the Utility Model

[0004] According to different aspects, the purpose of the present disclosure is to provide a new design form of a throttle element, which can support the lubricating oil circulation in the scroll compressor in a cost-effective manner.

[0005] In addition, the present disclosure also aims to solve or alleviate other technical problems existing in the prior art.

[0006] The present disclosure solves the above problems by providing a scroll compressor and a vehicle air conditioning system. Specifically, according to one aspect of the present disclosure, there is provided:

[0007] A scroll compressor, wherein the scroll compressor includes an end cover, a scroll assembly, and a bearing housing. The end cover is provided with a throttle passage, the scroll assembly is provided with a through hole, the bearing housing is provided with a through port, the throttle passage, the through hole, and the through port are sequentially communicated, the through port is communicated to the bearing cavity of the bearing housing, and the scroll compressor further includes a throttle element disposed in the throttle passage for the lubricating oil of the scroll compressor to flow into the through hole via the throttle element.

[0008] According to another aspect of the present disclosure, the present disclosure provides a vehicle air conditioning system, wherein the vehicle air conditioning system includes any one of the above scroll compressors. Description of the Drawings

[0009] With reference to the accompanying drawings, the above and other features of the present disclosure will become apparent, wherein,

[0010] Figure 1Shows a cross-sectional view of a scroll compressor according to the present disclosure;

[0011] Figure 2 Shows an axonometric sectional view of a scroll compressor according to the present disclosure in its end cover region;

[0012] Figure 3 Shows an axonometric view of the working mode of a throttling element according to the present disclosure;

[0013] Figure 4 Shows a plan view of the working mode of a throttling element according to the present disclosure;

[0014] Figure 5 Shows a plane sectional view of a throttling element according to the present disclosure; and

[0015] Figure 6 Shows a cross-sectional view of a scroll compressor according to the present disclosure in the throttling passage region of the end cover. Detailed Description of the Invention

[0016] It is easy to understand that according to the technical solution of the present disclosure, without changing the essence of the present disclosure, those of ordinary skill in the art can propose various interchangeable structural forms and implementation manners. Therefore, the following detailed description and the accompanying drawings are only exemplary descriptions of the technical solution of the present disclosure, and should not be regarded as the whole of the present disclosure or as a limitation or restriction on the technical solution of the present disclosure.

[0017] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined with respect to the structures shown in the respective drawings. They are relative concepts, and thus may change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms. In addition, the terms "first", "second", "third", etc. or similar expressions are only used for descriptive and differentiating purposes, and should not be construed as indicating or implying the relative importance of the corresponding components.

[0018] Refer to Figure 1 and Figure 2 , wherein, Figure 1 Shows a cross-sectional view of a scroll compressor according to the present disclosure; and Figure 2 Shows an axonometric sectional view of a scroll compressor according to the present disclosure in its end cover region.

[0019] The scroll compressor 100 includes an end cover 1 (also known as a top cover), a scroll disk assembly 2, and a bearing housing 3. The end cover 1 is provided with a throttling passage 11, the scroll disk assembly 2 is provided with a through hole 21, and the bearing housing 3 is provided with a port 31. The throttling passage 11, the through hole 21, and the port 31 are sequentially communicated. The port 31 communicates with the bearing cavity 32 of the bearing housing 3. The scroll compressor 100 further includes a throttling element 4 disposed in the throttling passage 11 for the lubricating oil of the scroll compressor 100 to flow into the through hole 21 via the throttling element 4.

[0020] In this technical solution, the design form of the throttling element of the scroll compressor, such as its arrangement position and the flow end position of the lubricating oil passing through it, is designed, providing a new technical concept and implementation method for the circulation of the lubricating oil in the scroll compressor, achieving the purpose of the present disclosure.

[0021] It should be understood that the working principle of the scroll compressor is to utilize the relative revolution movement of the moving and stationary scroll disks (or called the moving and stationary scroll disks, collectively called the scroll disk assembly) to form a continuous change in the enclosed volume to achieve the purpose of compressing gas. In addition to the parts mentioned above, the scroll compressor may further include: a housing 6, which is connected to the end cover 1 and together constitutes the entire outer shell of the scroll compressor, and the remaining components are located inside the outer shell; a main shaft 7, the axis of the main shaft corresponding to the axis of the scroll compressor; an electric motor, which is arranged around the main shaft and includes a stator 8 and a rotor 9. Among them, the rotor is arranged between the stator and the main shaft, and the main shaft is driven to rotate by driving the rotor of the electric motor. The main shaft is supported by the corresponding bearings 10 of the scroll compressor, and the bearings are arranged on the bearing housing. Finally, the main shaft drives the moving scroll disk to move, and a sealed working chamber can be formed with the stationary scroll disk, thereby sequentially completing the processes of suction, compression, and exhaust. In addition, the scroll compressor can further include an oil-gas separator 12, which is, for example, arranged at a side port of the end cover for receiving exhaust gas, for separating the lubricating oil from the gas discharged by the compressor, and ensuring the purity and dryness of the gas for subsequent suction use by the scroll disk assembly. Specifically, it can utilize centrifugal force and gravity to achieve the separation of the oil-gas mixture. The separated lubricating oil O (i.e., Oil) is temporarily stored in the internal space of the end cover and can flow into the throttling element through the throttling passage provided in the end cover. It can be understood that the throttling element is also often called a throttle or a valve (depending on different usage scenarios), which is a component that can be used to regulate the fluid pressure, and is sometimes also called a throttle valve spool. It can also be understood that the scroll disk assembly 2 is connected to the bearing housing 3, the scroll disk assembly 2 is disposed between the bearing housing 3 and the end cover 1, and the scroll disk assembly 2 (for example, Figure 1In it, its outer edge part is connected to the end cover 1. By establishing different oil pressures at both ends (the inlet and the outlet) of the throttling element to form a pressure difference, it promotes the flow of high-pressure oil towards the low-pressure direction and can achieve pressure maintenance (maintaining the pressure difference), supporting the circulation of lubricating oil. It can also be understood that a throttling element can be provided in the bearing housing area of the scroll compressor to further promote the circulation of lubricating oil. In this regard, the end cover area of the scroll compressor can be regarded as a high-pressure chamber, the bearing housing area as a medium-pressure chamber, and the motor area as a low-pressure chamber. Since the overall working principle of the scroll compressor is not the focus of this disclosure, only a brief introduction is given here.

[0022] In this technical solution, the throttling channel is opened on the end cover for arranging the throttling element. Compared with the way of arranging the throttling channel on the stationary scroll, it can provide more design space for the throttling element, and avoids the possibility of increasing the structure, size, and cost of the stationary scroll to accommodate the throttling element, and also reduces the cost and quality of the scroll compressor as a whole. Relatively speaking, the design of the through hole of the scroll assembly in this technical solution can be achieved in a relatively simple way, and the space inside the end cover with a large design margin can be used to construct the throttling channel and the throttling element, with higher cost performance. In addition, this technical solution stipulates the flow direction of the lubricating oil, that is, the lubricating oil finally flows out to the bearing cavity of the bearing housing or the bearing cavity where the bearing housing is located. Compared with the solution of guiding the lubricating oil into the space of the scroll assembly, for example, it has the characteristics of being able to form a back pressure in the bearing cavity, enabling the dynamic and stationary scrolls to fit as closely as possible, reducing the gas leakage between them, improving the volumetric efficiency of the compressor, and reducing the power consumption of the compression connection. At the same time, it can also improve the lubricating ability of the lubricating oil and reduce the wear of parts. In this regard, the bearing cavity can also be called a back pressure cavity.

[0023] From Figure 1 It can also be seen that the scroll assembly 2 includes a stationary scroll 22 and a moving scroll 23, the through hole 21 is opened on the stationary scroll 22, and the throttling channel 11 and the through hole 21 extend along the axial direction of the scroll compressor 100.

[0024] In this technical solution, the through hole is constructed by using the stationary scroll with relatively large dimensions, so there is a large design margin. And since the throttling channel and the throttling element are arranged on the end cover, the opening of the through hole can be carried out simply, such as a straight horizontal through hole (in Figure 1In terms of the perspective of [description omitted], the throttling channels can be respectively connected to the ports. Here, the end side of the stationary scroll is directly connected to the bearing housing area of the scroll compressor, so it is also convenient for the through holes opened therein to communicate with the bearing housing. It can also be seen that depending on the direction of the port, it can also be called an inclined hole of the bearing housing, and the lubricating oil circulation is also achieved in a simple and effective manner. In addition, those skilled in the art know the axial direction of the scroll compressor. For example, it can correspond to the axial direction of the main shaft, which is presented as a horizontal direction in Figure 1 As mentioned partially before, the axially extending through holes and throttling channels are convenient for manufacturing, facilitating their easy connection, and also being more compatible with the structures of the corresponding parts of the end cover or the stationary scroll where they are located.

[0025] Reference Figure 3 and Figure 4 , in which, Figure 3 shows a perspective view of the working mode of a throttling element according to the present disclosure; and Figure 4 shows a plan view of the working mode of a throttling element according to the present disclosure.

[0026] The throttling element 4 is configured with an oil guiding portion 41 that introduces and discharges the lubricating oil, and makes the pressure of the discharged lubricating oil lower than the pressure of the introduced lubricating oil.

[0027] Thus, it can be seen that the establishment of the oil pressure difference is achieved through the oil guiding portion, and the oil pressure at the inlet is higher than the oil pressure at the outlet, thereby promoting the oil circulation. Regarding the structure of the oil guiding portion itself, the present disclosure does not make special constraints. It should be known that the factors for the throttling element to establish the pressure difference include the cross-sectional area, length, etc. of the oil guiding portion or the oil path. This pressure difference will cause the fluid to accelerate through the throttling element, thereby achieving the control of the flow rate. Therefore, the expected pressure difference and flow rate effects can be achieved by setting parameters such as the length and cross-sectional area of the oil guiding portion or the oil path. The specific setting method can be determined through natural formulas, empirical formulas, or through physical experiments or simulation experiments.

[0028] In such as Figure 3 , 4In the illustrated embodiment, the oil guiding portion 41 is configured on the outer peripheral surface of the throttling element 4 and extends spirally. The throttling element can be configured as a rotating body. Therefore, the oil guiding portion is arranged spirally along the outer periphery of the rotating body, and an inlet and an outlet for lubricating oil are respectively formed at the ends. The inlet and the outlet can correspondingly have a plurality of them, and both can allow the lubricating oil to flow through the main body portion of the oil guiding portion. The flow direction of the oil is exemplarily indicated by red lines in these two figures for clear understanding. The spiral shape is beneficial to making full use of the design space provided by the outer surface of the throttling element, and thus can provide a relatively large length range for selection. For example, when the length of the oil guiding portion is relatively long, its cross-sectional area can be designed to be larger, which is beneficial for the manufacturing process. Using a spiral flow channel to reduce the pressure of a high-pressure fluid (lubricating oil) can achieve a significant reduction in the fluid pressure. Exemplarily, the cross-section of the spiral oil guiding portion is circular. In addition, according to requirements, the oil guiding portion can be one or a plurality of them sleeved inside and outside each other.

[0029] Combined Figure 5 , which shows a plan sectional view of a throttling element according to the present disclosure.

[0030] The throttling element 4 can be configured with a recess 42 that opens towards the inflow direction of the lubricating oil. The recess 42 is exemplarily configured at the center of the end face of the throttling element to form a kind of blind hole. The design of this recess has many advantages. On the one hand, when the lubricating oil flows towards the throttling element, a part of the lubricating oil flows through the throttling element (such as its oil guiding portion) and flows out, and a part of the lubricating oil will flow into the recess and impact the side wall of the recess. Thus, this impact force makes the side wall have a tendency to expand outwards (that is, expand under pressure), so that there is a greater contact force between the side wall of the throttling element and the inner wall of the throttling channel, and therefore the sealing performance between the two can be improved. On the other hand, the recess itself can also be used as a kind of memory, which can store oil particles, avoiding or alleviating the risk of oil particles blocking the oil guiding portion or the sealing interface, and ensuring the smoothness of the oil circulation. Those skilled in the art can correspondingly set the shape, size, quantity and other characteristics of the recess according to experiments or simulations according to the characteristics or requirements of the oil circulation.

[0031] In terms of materials, in some embodiments of the present disclosure, the throttling element 4 is made of resin or metal. It should be understood here that the material selection of the throttling element will directly affect its performance and use environment. Specifically, the benefits of resin throttling elements include strong plasticity and good durability. The benefits of metal throttling elements (such as stainless steel, cast iron, copper, etc.) include corrosion resistance and high temperature resistance, high strength and wear resistance. In addition, the cost of these two materials is relatively low. It should be noted that throttling elements of different materials have their own advantages and applicable scenarios. When selecting, the use environment, fluid characteristics, working pressure and temperature of the throttling element should be comprehensively considered to ensure that the most suitable throttling element material is selected. In addition, for special application scenarios, other factors may also need to be considered, such as environmental protection, cost, etc.

[0032] refer to Figure 2 , and combined with Figure 6 ,in, Figure 6 A cross-sectional view of a throttling passage area of an end cover of a scroll compressor according to the present disclosure is shown.

[0033] The scroll compressor 100 further includes a filter 5 , which is arranged in the throttling channel 11 and upstream of the throttling element 4 along the flow direction of the lubricating oil. The filter 5 is used to filter lubricating oil particles.

[0034] It can be seen that the setting of the filter can avoid or alleviate the blockage of the throttling element by oil particles, improve the overall operating reliability of the system, and also increase the service life of the throttling element. During maintenance, only the filter needs to be cleaned or replaced, and there is no need to maintain the throttling element itself, which reduces costs. In some embodiments, the filter is a filter screen, which can block the oil particles in a cost-effective manner. If necessary, a multi-stage filter, such as a coarse filter and a fine filter, can also be set to improve the filtering intensity, extend the service life of the filter, and reduce maintenance costs.

[0035] In order to improve the sealing performance, the throttling element 4 and the filter 5 are respectively interference fit or interference press fit with the throttling channel 11, so as to better control the oil circulation along the designed route and give full play to the proper functions of the filter and the throttling element.

[0036] from Figure 6It can also be clearly seen that the throttle passage 11 is configured with a stepped hole, and the stepped portion 111 of the stepped hole abuts against the end of the throttle element 4. This design can be particularly well used in conjunction with the interference press-fitting process. From this design, it can be seen that the stepped portion realizes a limiting effect on the throttle element, so that during the press-fitting process, the positional accuracy of the throttle element can be guaranteed, and the press-fitting with the filter is not affected by each other. In addition, by the design of the stepped portion, the throttle passage is divided into two parts, that is, two parts with larger and smaller inner diameters. The channels of these two parts can be designed with different press-fitting accuracies and machining accuracies according to requirements, which saves costs compared with a single large channel. Thus, through the arrangement of the stepped hole of this technical solution, the mutual influence between these two press-fitting processes can be avoided, ensuring that the interference forces between the throttle element, the filter and the throttle passage all meet the set requirements and will not fall off.

[0037] According to another aspect of the present disclosure, the present disclosure also relates to a vehicle air conditioning system, wherein the vehicle air conditioning system includes any one of the above-mentioned scroll compressors 100. Thus, various embodiments of the vehicle air conditioning system and various technical effects that can be achieved inherit various embodiments and technical effects of the scroll compressor, and will not be elaborated herein.

[0038] It should be understood that all the above preferred embodiments are exemplary rather than restrictive, and various modifications or deformations made by those skilled in the art to the specific embodiments described above under the concept of the present disclosure should be within the legal protection scope of the present disclosure.

Claims

1. A scroll compressor (100), characterized in that, The scroll compressor (100) includes an end cover (1), a scroll disk assembly (2), and a bearing housing (3). The end cover (1) is provided with a throttling passage (11). The scroll disk assembly (2) is provided with a through hole (21). The bearing housing (3) is provided with a through port (31). The throttling passage (11), the through hole (21), and the through port (31) are sequentially communicated. The through port (31) communicates with the bearing cavity (32) of the bearing housing (3). The scroll compressor (100) further includes a throttling element (4). The throttling element (4) is arranged in the throttling passage (11) for the lubricating oil of the scroll compressor (100) to flow into the through hole (21) via the throttling element (4). The throttling element (4) is configured with an oil guiding portion (41). The oil guiding portion (41) introduces and discharges the lubricating oil, and makes the pressure of the discharged lubricating oil lower than the pressure of the introduced lubricating oil.

2. The scroll compressor (100) according to claim 1, characterized in that, The scroll disk assembly (2) includes a stationary scroll (22) and a rotating scroll (23). The through hole (21) is provided in the stationary scroll (22). The throttling passage (11) and the through hole (21) extend along the axial direction of the scroll compressor (100).

3. The scroll compressor (100) according to claim 1, characterized in that, The oil guiding portion (41) is configured on the outer peripheral surface of the throttling element (4) and extends spirally.

4. The scroll compressor (100) according to claim 1, characterized in that, The throttling element (4) is configured with a recessed portion (42). The recessed portion (42) is open towards the inflow direction of the lubricating oil.

5. The scroll compressor (100) according to claim 1, wherein, The scroll compressor (100) further includes a filter (5). The filter (5) is arranged in the throttling passage (11) and is arranged upstream of the throttling element (4) along the flow direction of the lubricating oil. The filter (5) is used to filter lubricating oil particles.

6. The scroll compressor (100) according to claim 1, characterized in that, The throttling element (4) is made of resin or metal.

7. The scroll compressor (100) according to claim 5, characterized in that, The throttling element (4) and the filter (5) are respectively in interference fit with the throttling passage (11).

8. The scroll compressor (100) according to claim 7, characterized in that, The throttling passage (11) is configured with a stepped hole. The stepped portion (111) of the stepped hole abuts against the end of the throttling element (4).

9. A vehicle air conditioning system, characterized in that, The vehicle air conditioning system includes the scroll compressor (100) according to any one of claims 1 to 8.

Images