A pump body assembly, scroll compressor and air conditioner

Abstract

The application provides a pump body assembly, a scroll compressor and an air conditioner, which comprise a static disc and a dynamic disc matched with each other, the static disc has a first plane facing the dynamic disc, the dynamic disc has a second plane facing the static disc, and the second plane can slide in close contact with the first plane; a compression cavity is formed between the static disc and the dynamic disc, and a back pressure cavity is arranged on the side of the dynamic disc away from the static disc; a first flow path is arranged on the static disc, the inlet of the first flow path is connected to the compression cavity, and the outlet of the first flow path is located on the first plane; a second flow path is arranged on the dynamic disc, the inlet of the second flow path is located on the second plane and can be connected to the outlet of the first flow path, and the outlet of the second flow path is connected to the back pressure cavity; a switching device is arranged in the first flow path, and when the pressure of the gas entering the first flow path from the inlet of the first flow path is greater than a preset pressure, the first flow path is opened, so that the technical problem of abnormal wear of the axial end surfaces of the dynamic disc and the static disc due to oil shortage during the starting stage of the scroll compressor in the prior art is solved.

Description

Technical Field

[0001] This invention belongs to the field of scroll compressor technology, specifically relating to a pump assembly, a scroll compressor, and an air conditioner. Background Technology

[0002] The scroll compressor is mainly composed of a moving scroll plate assembly, a stationary scroll plate assembly, a crankshaft assembly, an upper support assembly, a lower support assembly, and a housing assembly. It features simple structure, small size, light weight, low noise, high mechanical efficiency, and stable operation.

[0003] In scroll compressors, oil supply to the pump body has always been a core issue in compressor technology. During the compression process of a scroll compressor, the scroll teeth of the moving and stationary scrolls mesh with each other, the tooth tips and roots of the moving and stationary scrolls mesh, and the end faces of the moving and stationary scrolls slide relative to each other. All these contacts require lubrication. If any contact surface experiences insufficient oil supply, it will lead to abnormal wear of the compressor, making it difficult to guarantee the reliability of the entire machine, and in severe cases, even causing the compressor to be scrapped. Therefore, the oil circuit lubrication structure, especially the oil circuit lubrication design of the moving and stationary scrolls, is extremely important for scroll compressors.

[0004] The existing high-pressure scroll compressor structure can be divided into low-pressure, medium-pressure, and high-pressure zones. The medium-pressure and high-pressure zones on the back of the moving scroll form a back pressure. Lubricating oil generally enters the medium-pressure zone from the high-pressure oil sump via the sliding sealing surfaces of the medium and high-pressure zones, forming an oil film on the end faces of the moving and stationary scrolls, lubricating them. When the compressor is not operating, the moving scroll rests on the surface of the upper support, with a relatively large gap between the end faces of the moving and stationary scrolls. When the compressor is running, the back pressure of the moving scroll pushes it up, reducing the gap between the end faces of the moving and stationary scrolls, preventing gas from entering. Simultaneously, it allows the scroll teeth of the moving scroll to form a sealing slide with the inner bottom surface of the stationary scroll, and the scroll teeth of the stationary scroll to form a sealing slide relative to the inner bottom surface of the moving scroll. When the compressor starts and stops frequently, during the startup phase of the scroll compressor, when the back pressure cannot be stably established, the gap between the axial end faces of the moving and stationary disks is large. The medium-pressure gas enters through the medium-pressure passage and significantly impacts the lubricating oil film on the end faces of the moving and stationary scrolls, damaging the end face oil film. When the back pressure stabilizes, abnormal wear occurs between the axial end faces of the moving and stationary disks due to lack of oil (no oil) contact and movement. Summary of the Invention

[0005] Therefore, the present invention provides a pump body assembly, a scroll compressor, and an air conditioner, which can solve the technical problem in the prior art of abnormal wear of the axial end faces of the moving and stationary discs in contact during the start-up phase of a scroll compressor due to lack of oil.

[0006] The present invention provides a pump body assembly for a scroll compressor, comprising a stationary disc and a moving disc that cooperate with each other, the stationary disc having a first plane facing the moving disc, the moving disc having a second plane facing the stationary disc, the second plane being capable of sliding relative to the first plane; a compression cavity is formed between the stationary disc and the moving disc, and a back pressure cavity is provided on the side of the moving disc facing away from the stationary disc;

[0007] The stationary plate is provided with a first flow path, the inlet of the first flow path leads to the compression chamber, and the outlet of the first flow path is located on a first plane; the moving plate is provided with a second flow path, the inlet of the second flow path is located on the second plane and can communicate with the outlet of the first flow path, and the outlet of the second flow path leads to the back pressure chamber.

[0008] The first flow path is equipped with a switching device. When the pressure of the gas entering the first flow path from the inlet is greater than the preset pressure, the first flow path is opened.

[0009] In some embodiments, the first flow path includes a first passage A, a first passage B, and a first passage C that intersect each other, and the outlet of the first passage C is the outlet of the first flow path;

[0010] The first passage A and the first passage B are respectively located on both sides of the first passage C; the inlet of the first passage A leads to the compression chamber;

[0011] The switching device includes a first slider, which is capable of sliding in a sealed manner within the first passage A and the first passage B, and is capable of sliding from the first passage A to the first passage B under the pressure of the gas in the compression chamber.

[0012] In some embodiments, the first path A, the first path B and the first path C constitute a T-shaped path;

[0013] The first passage A and the first passage B are coaxial. The first end of the first passage B leads to the first passage A, and the second end of the first passage B leads to the outer side of the stationary plate. An elastic element is provided on the side of the first slider facing the second end of the first passage B. When the first slider slides from the first passage A to the first passage B to connect the first passage A and the first passage C, the first slider squeezes the elastic element.

[0014] In some embodiments, a first plug is provided at the second end of the first passage B. The first plug includes a first rod extending into the first passage B. The elastic element is a first spring. The first end of the first spring is connected to the first rod, and its second end is connected to the first slider. Controlling the first plug can adjust the position of the first rod in the first passage B.

[0015] In some embodiments, the first slider has a first groove at one end facing the first plug, and the second end of the first spring is located in the first groove.

[0016] In some embodiments, an annular cylinder is provided at the lower center of the moving disk, and the axis of the annular cylinder is parallel to the axis of the moving disk;

[0017] The moving plate is provided with a third flow path, the inlet of which leads to the interior of the ring cylinder, and the outlet of which is located on the second plane; the third flow path is provided with a damping element that can reduce the liquid flow velocity.

[0018] In some embodiments, the damping element is a throttling pin, which includes a cylindrical rod and a helical groove disposed on the outer circumferential surface of the cylindrical rod.

[0019] In some embodiments, the third flow path includes a blind hole extending radially along the moving disk, an oil inlet near the bottom of the blind hole, and an oil outlet away from the bottom of the blind hole. A second plug is provided at the opening of the blind hole. The second flow path intersects the blind hole. When the moving disk rotates, the inlet of the second flow path is intermittently connected to the outlet of the first flow path. The inlet of the oil inlet is the inlet of the third flow path, and the outlet of the oil outlet is the outlet of the third flow path.

[0020] In some embodiments, in the radial direction of the moving disk, the oil outlet is located inside the second flow path; a second slider is provided in the blind hole between the oil outlet and the second flow path, and the second slider always separates the oil outlet and the second flow path;

[0021] The second slider can slide within the blind hole. A second spring is provided between the second slider and the second plug. A second rod is provided on the end face of the second plug facing the blind hole. When the second slider abuts against the second rod, the second slider can block part of the second flow path.

[0022] In some embodiments, a second groove is provided on the inner wall surface of the blind hole between the damping member and the oil outlet, and the side of the second slider facing the oil inlet is flush with the inner wall cross-section of the oil outlet near the second flow path.

[0023] The present invention also provides a scroll compressor, including the pump body assembly.

[0024] This application incorporates a switching device within the first flow path, ensuring that sufficient lubricating oil flows between the first and second planes before the gas enters the back pressure chamber via the first and second flow paths during pump assembly startup. Compared to existing technologies, this delays the time it takes for gas from the compression chamber to enter the back pressure chamber. This ensures sufficient lubricating oil between the first and second planes before the moving plate moves upward. Furthermore, after the moving plate moves upward, the gap between the first and second planes decreases (the gap is extremely small, theoretically it will decrease, but considering the lubricating oil, gas will hardly enter this gap). Therefore, when the gas passes through the gap between the first and second planes, it will not enter the gap and blow away the lubricating oil (oil film) within it. This ensures sufficient lubricating oil axially between the moving and stationary plates, improves the stability of the oil film, allows the moving plate to rotate stably relative to the stationary plate, reduces friction, and improves the reliability and service life of the pump assembly. Attached Figure Description

[0025] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0026] Figure 1 This is a partial cross-sectional view of a scroll compressor according to an embodiment of the present invention;

[0027] Figure 2 This is a partial cross-sectional view of the scroll compressor of an embodiment of the present invention after the outer casing has been removed;

[0028] Figure 3 This is a cross-sectional view of the stationary disk according to an embodiment of the present invention;

[0029] Figure 4 This is an embodiment of the present invention. Figure 3 Enlarged view at point E in the middle;

[0030] Figure 5 This is a schematic diagram of the first slider structure according to an embodiment of the present invention;

[0031] Figure 6 This is a radial schematic diagram of the first slider in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram showing the first flow path being closed according to an embodiment of the present invention;

[0033] Figure 8 This is an embodiment of the present invention. Figure 7 Enlarged view at point F;

[0034] Figure 9 This is a schematic diagram showing the first flow path being opened according to an embodiment of the present invention;

[0035] Figure 10 This is an embodiment of the present invention. Figure 9 Enlarged view at point G;

[0036] Figure 11 This is a radial sectional view of the moving disk in an embodiment of the present invention;

[0037] Figure 12 This is an embodiment of the present invention. Figure 11 Enlarged view at point H;

[0038] Figure 13 This is a schematic diagram of the third flow path of the present invention when a second slider is provided;

[0039] Figure 14 This is an embodiment of the present invention. Figure 13 Enlarged view at point I;

[0040] Figure 15 This is a schematic diagram of the second flow path being blocked by the second slider in an embodiment of the present invention;

[0041] Figure 16 This is an embodiment of the present invention. Figure 15 Enlarged view of point J in the middle;

[0042] Figure 17 This is a schematic diagram showing the second slider in contact with the second rod in an embodiment of the present invention;

[0043] Figure 18 This is an embodiment of the present invention. Figure 17 Enlarged view at point K;

[0044] Figure 19 This is a schematic diagram of the flow-throttling structure according to an embodiment of the present invention;

[0045] The reference numerals in the attached figures are as follows:

[0046] 1. Stationary plate; 101. First plane; 2. Moving plate; 201. Second plane; 3. Back pressure chamber; 301. Ring cylinder; 302. Throttling pin; 303. Spiral groove; 304. Blind hole; 305. Oil outlet; 306. Oil inlet; 307. Bracket; 308. Crankshaft; 401. First flow path; 4011. First passage A; 4012. First passage B; 4013. First passage C; 402. Second flow path; 403. Third flow path; 501. First slider; 502. Second slider; 601. First spring; 602. Second spring; 701. First plug; 702. Second plug; 801. First rod; 802. Second rod; 901. First groove; 902. Second groove. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of illustrative purposes and to facilitate understanding and reading by those skilled in the art, and are not intended to limit the conditions under which the invention can be implemented. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed in the invention. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0051] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0052] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0053] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0054] This invention belongs to the field of scroll compressor technology, specifically relating to a pump assembly, a scroll compressor, and an air conditioner.

[0055] The scroll compressor is mainly composed of a moving scroll plate assembly, a stationary scroll plate assembly, a crankshaft assembly, an upper support assembly, a lower support assembly, and a housing assembly. It features simple structure, small size, light weight, low noise, high mechanical efficiency, and stable operation.

[0056] In scroll compressors, oil supply to the pump body has always been a core issue in compressor technology. During the compression process of a scroll compressor, the scroll teeth of the moving and stationary scrolls mesh with each other, the tooth tips and roots of the moving and stationary scrolls mesh, and the end faces of the moving and stationary scrolls slide relative to each other. All these contacts require lubrication. If any contact surface experiences insufficient oil supply, it will lead to abnormal wear of the compressor, making it difficult to guarantee the reliability of the entire machine, and in severe cases, even causing the compressor to be scrapped. Therefore, the oil circuit lubrication structure, especially the oil circuit lubrication design of the moving and stationary scrolls, is extremely important for scroll compressors.

[0057] The existing high-pressure scroll compressor structure can be divided into low-pressure, medium-pressure, and high-pressure zones. The medium-pressure and high-pressure zones on the back of the moving scroll form a back pressure. Lubricating oil generally enters the medium-pressure zone from the high-pressure oil sump via the sliding sealing surfaces of the medium and high-pressure zones, forming an oil film on the end faces of the moving and stationary scrolls, lubricating them. When the compressor is not operating, the moving scroll rests on the surface of the upper support, with a relatively large gap between the end faces of the moving and stationary scrolls. When the compressor is running, the back pressure of the moving scroll pushes it up, reducing the gap between the end faces of the moving and stationary scrolls, preventing gas from entering. Simultaneously, it allows the scroll teeth of the moving scroll to form a sealing slide with the inner bottom surface of the stationary scroll, and the scroll teeth of the stationary scroll to form a sealing slide relative to the inner bottom surface of the moving scroll. When the compressor starts and stops frequently, during the startup phase of the scroll compressor, when the back pressure cannot be stably established, the gap between the axial end faces of the moving and stationary disks is large. The medium-pressure gas enters through the medium-pressure passage and significantly impacts the lubricating oil film on the end faces of the moving and stationary scrolls, damaging the end face oil film. When the back pressure stabilizes, abnormal wear occurs between the axial end faces of the moving and stationary disks due to lack of oil (no oil) contact and movement.

[0058] Therefore, the present invention provides a pump body assembly, a scroll compressor, and an air conditioner, which can solve the technical problem in the prior art of abnormal wear of the axial end faces of the moving and stationary discs in contact during the start-up phase of a scroll compressor due to lack of oil.

[0059] Combination Figure 1-19 As shown, a pump body assembly for a scroll compressor includes a stationary disc 1 and a moving disc 2 that cooperate with each other. The stationary disc 1 has a first plane 101 facing the moving disc 2, and the moving disc 2 has a second plane 201 facing the stationary disc 1. The second plane 201 is slidable relative to the first plane 101. A compression cavity is formed between the stationary disc 1 and the moving disc 2, and a back pressure cavity 3 is provided on the side of the moving disc 2 facing away from the stationary disc 1.

[0060] The stationary disk 1 is provided with a first flow path 401, the inlet of the first flow path 401 leads to the compression chamber, and the outlet of the first flow path 401 is located on the first plane 101; the moving disk 2 is provided with a second flow path 402, the inlet of the second flow path 402 is located on the second plane 201 and can communicate with the outlet of the first flow path 401, and the outlet of the second flow path 402 leads to the back pressure chamber 3;

[0061] The first flow path 401 is equipped with a switching device. When the pressure of the gas entering the first flow path 401 through the inlet is greater than the preset pressure, the first flow path 401 is opened.

[0062] The back pressure chamber 3 in this application specifically refers to "the area below the moving disk 2 where the gas discharged from the compression chamber enters", excluding the area before the high-pressure lubricating oil discharged from the crankshaft 308 enters the moving disk 2. The first plane 101 and the second plane 201 can fit together, but they are not always in contact. It means that they are in contact during operation, and when not in operation, the moving disk falls downwards, and the first plane 101 and the second plane 201 separate.

[0063] Before the pump assembly starts, the moving plate 2 rests on the support 307 under gravity. There is a large gap between the first plane 101 and the second plane 201, and a small amount of oil film (residual oil film from the previous start) exists between them. However, this oil film is insufficient to effectively lubricate the relative movement between the first plane 101 and the second plane 201. When the pump assembly starts, gas from the compression chamber enters the first flow path 401. Before the gas pressure in the first flow path 401 reaches the preset pressure, the switching device closes the first flow path 401, preventing gas from reaching the outlet of the first flow path 401 and entering the gap between the first plane 101 and the second plane 201. Before the gas pressure in the first flow path 401 reaches the preset pressure, lubricating oil continuously enters the first plane 101 and the second plane 201, forming a thicker oil film between them, thus lubricating the first plane 101. 1. The second plane 201 is fully lubricated. As the moving disk 2 continues to rotate, the pressure in the compression chamber gradually increases. When the pressure of the gas entering the first flow path 401 from the inlet of the compression chamber is greater than the preset pressure, the first flow path 401 opens. After passing through the first flow path 401, part of the gas enters the gap between the first plane 101 and the second plane 201. Since a large amount of lubricating oil has already entered the gap between the first plane 101 and the second plane 201, after the gas is blown, there is still enough lubricating oil to ensure that there is a small frictional resistance between the first plane 101 and the second plane 201. The other part of the gas enters the back pressure chamber 3 through the second flow path 402, causing the moving disk 2 to move upward and thus making the second plane 201 and the first plane 101 come into contact. After the second plane 201 and the first plane 101 come into contact, only a very small amount (or even none) of the gas will enter the gap between the first plane 101 and the second plane 201 from the outlet of the first flow path 401.

[0064] In other words, compared with the prior art, this application delays the time for gas in the compression chamber to enter the back pressure chamber 3. This application ensures that when the pump assembly starts, sufficient lubricating oil flows between the first plane 101 and the second plane 201 first, and then the gas enters the back pressure chamber 3 through the first flow path 401 and the second flow path 402. This ensures sufficient lubricating oil between the first plane 101 and the second plane 201 before the moving plate 2 moves upward. Furthermore, after the moving plate 2 moves upward, the gap between the first plane 101 and the second plane 201 decreases (the gap is extremely small, theoretically it will decrease, but considering the lubricating oil, the gas will hardly enter this gap). Therefore, when the gas passes through the gap between the first plane 101 and the second plane 201, it will not enter the gap and blow away the lubricating oil (oil film) within the gap. This ensures sufficient lubricating oil between the moving plate 2 and the stationary plate 1 axially, improves the stability of the oil film, allows the moving plate 2 to rotate stably relative to the stationary plate 1, reduces friction, and improves the reliability and service life of the pump assembly.

[0065] Before the first flow path 401 opens, the moving plate 2 rests on the bracket 307. The seal between the moving plate 2 and the stationary plate 1 is poor, and the pressure in the compression chamber rises slowly. This allows the lubricating oil sufficient time to flow between the first plane 101 and the second plane 201. The preset pressure is less than or equal to the minimum actual output pressure of the pump assembly.

[0066] Generally, the compression chamber can be divided into a high-pressure zone, a medium-pressure zone, and a low-pressure zone from the center to the edge of the stationary plate 1. The pressure in the high-pressure zone is too high and the pressure in the low-pressure zone is too low. Generally, the inlet of the first flow path 401 is connected to the medium-pressure zone, and gas is introduced from the medium-pressure zone.

[0067] Preferred, such as Figure 3-4 As shown, the first flow path 401 includes intersecting first passages A4011, B4012 and C4013, and the outlet of the first passage C4013 is the outlet of the first flow path 401.

[0068] The first passage A4011 and the first passage B4012 are respectively located on both sides of the first passage C4013; the inlet of the first passage A4011 leads to the compression chamber;

[0069] The switching device includes a first slider 501, which can slide in a sealed manner within the first passage A4011 and the first passage B4012. The first slider 501 can slide from the first passage A4011 to the first passage B4012 under the pressure of the gas in the compression chamber.

[0070] When the first slider 501 is in the first passage A4011, the first flow path 401 is disconnected, and gas cannot flow from the first passage A4011 to the first passage C4013. When the gas pressure rises to a preset pressure, the gas pushes the first slider 501 to slide from the first passage A4011 to the first passage B4012, connecting the first passage A4011 and the first passage C4013. The gas in the compression chamber then reaches the outlet of the first flow path 401 through the first passage A4011 and the first passage C4013. By causing the first slider 501 to move under the action of gas pressure to open the first flow path 401, the opening or closing of the first flow path 401 is directly related to the gas pressure entering the first flow path 401, thus improving the stability of the opening or closing of the first flow path 401.

[0071] Preferred, such as Figure 4 , Figures 7-10 As shown, the first path A4011, the first path B4012 and the first path C4013 constitute a T-shaped path;

[0072] The first passage A4011 and the first passage B4012 are coaxial. The first end of the first passage B4012 leads to the first passage A4011, and the second end of the first passage B4012 leads to the outer side of the stationary disc 1. An elastic element is provided on the side of the first slider 501 facing the second end of the first passage B4012. When the first slider 501 slides from the first passage A4011 to the first passage B4012 to connect the first passage A4011 and the first passage C4013, the first slider 501 squeezes the elastic element.

[0073] By forming a T-shaped passage with the first passage A4011, the first passage B4012, and the first passage C4013, the sliding of the first slider 501 is facilitated. An elastic element is provided on one side of the second end of the first passage B4012. This elastic element exerts a force on the first slider 501 towards the first passage A4011. The greater the deformation of the elastic element, the greater the force exerted on the first slider 501. As the pressure of the gas entering the first passage A4011 increases, the first slider 501 slides along a first direction (the first direction is from the first passage A4011 towards the first passage B4012; the second direction in this paper is opposite to the first direction) and compresses the elastic element. Figure 10 As shown, when the first passage A4011 and the first passage C4013 are connected, gas enters the first passage C4013; when the pump assembly gradually stops, the gas pressure entering the first passage A4011 decreases, as... Figure 8 As shown, the first slider 501 slides along the second direction under the action of the elastic element and gradually blocks the first passage A4011 and the first passage C4013. The first slider 501 blocks the first passage A4011 and the first passage C4013, which prepares for the next start-up. On the other hand, after the first passage A4011 and the first passage C4013 are blocked, the pressure in the back pressure chamber 3 drops rapidly, which causes the moving plate 2 to lose back pressure and move downward and fall on the bracket 307. This reduces the seal between the moving plate 2 and the stationary plate 1, which in turn causes the pressure in the compression chamber of the pump body to drop rapidly, which is conducive to the rapid stop of the pump body assembly.

[0074] Preferred, such as Figure 7-10 As shown, a first plug 701 is provided at the second end of the first passage B4012. The first plug 701 includes a first rod 801 extending into the first passage B4012. The elastic element is a first spring 601. The first end of the first spring 601 is connected to the first rod 801, and its second end is connected to the first slider 501. Controlling the first plug 701 can adjust the position of the first rod 801 in the first passage B4012.

[0075] By controlling the first plug 701 to adjust the position of the first rod 801 within the first passage B4012, the position of the first spring 601 within the first passage B4012 is changed, thereby changing the elastic force that the first slider 501 needs to overcome when sliding along the first direction. This changes the minimum air pressure required to connect the first passage A4011 and the first passage C4013, meaning the preset pressure can be changed. By adjusting the first rod 801, the preset pressure can be adjusted, allowing the pump body assembly to be produced modularly. When different compressors are used with the pump body assembly, only the first plug 701 needs to be adjusted to change the preset pressure, adapting it to (less than or equal to) the actual gas pressure output by the compressor at its minimum operating frequency (theoretically, at different frequencies, the output gas pressure remains the same, only the gas volume changes; in practice, considering factors such as leakage and damping, the higher the operating frequency of the pump body, the higher the output gas pressure will be).

[0076] The outer peripheral surface of the first slider 501 is sealed to the inner wall surfaces of the first passage A4011 and the first passage B4012.

[0077] As shown in the figure Figures 4-6 As shown, the inner diameter of the sliding portion of the first slider 501 within the first passage A4011 is d1, the inner diameter of the non-sliding portion of the first slider 501 within the first passage A4011 is d2, the inner diameter of the first passage C4013 is d3, and the length of the first slider 501 along the sliding direction is L; then d1 > d2, to prevent the first slider 501 from sliding too much towards the inlet direction of the first flow path 401, which would cause the gas to push the first slider 501 too slowly; L > d3, to prevent the first slider 501 from falling downward into the first passage C4013; the diameter of the first slider 501 is d4, which is slightly smaller than d1, and the first slider 501 slides at the edge.

[0078] The length of the first spring 601 in its natural extended state must ensure that part of the first slider 501 is located within the first passage A4011, so that the first slider 501 can completely separate the first passage A4011 and the third passage C when the moving disk 2 starts to rotate.

[0079] Preferred, such as Figure 5 As shown, the first slider 501 has a first groove 901 at one end facing the first plug 701, and the second end of the first spring 601 is located in the first groove 901.

[0080] By setting the first groove 901, the second end of the first spring 601 is located inside the first groove 901. On the one hand, this can extend the length of the first spring 601 (reduce the spring coefficient of the first spring 601), making the adjustment of the preset pressure of the first plug 701 more precise (elastic deformation of a certain length results in less energy conversion); on the other hand, the force exerted by the first spring 601 on the first slider 501 inside the first groove 901 is more balanced, which is conducive to the smooth sliding of the first slider 501.

[0081] Preferred, such as Figure 11 As shown, an annular cylinder 301 is provided at the lower center of the moving disk 2, and the axis of the annular cylinder 301 is parallel to the axis of the moving disk 2.

[0082] The moving plate 2 is provided with a third flow path 403. The inlet of the third flow path 403 leads to the interior of the ring cylinder 301, and the outlet of the third flow path 403 is located on the second plane 201. The third flow path 403 is provided with a damping element that can reduce the liquid flow velocity.

[0083] The inner wall of the ring cylinder 301 is a bearing seat for installing bearings. The crankshaft 308 is installed inside the bearing. The rotation of the crankshaft 308 drives the drive disc 2 to rotate. The crankshaft 308 is also provided with a central hole. Lubricating oil enters the ring cylinder 301 along the central oil hole and enters the third flow path 403 from the inlet of the third flow path 403. It then enters the first plane 101 and the second plane 201 from the outlet of the third flow path 403 to form an oil film.

[0084] A damping element is installed in the third flow path 403 so that the speed of the lubricating oil decreases and the flow rate decreases when the lubricating oil passes through the damping element, thereby avoiding excessive flow of lubricating oil from the third flow path 403 and insufficient lubricating oil in the oil sump.

[0085] When the moving disc 2 stops rotating, the ring cylinder 301 is still under high pressure, so that the lubricating oil between the first plane 101 and the second plane 201 will not be lost due to the decrease in pressure in the third flow path 403. That is, the state of supplying oil to the gap between the first plane 101 and the second plane 201 is maintained in the ring cylinder 301 until the pressure in the compressor with the pump body assembly is balanced, thereby ensuring sufficient lubricating oil between the first plane 101 and the second plane 201.

[0086] Due to the damping element, after the rotating disk 2 stops rotating, the pressure in the area between the damping element and the outlet of the third flow path 403 is also relatively high, which also prevents the lubricating oil from quickly flowing out from the first plane 101 and the second plane 201.

[0087] Preferred, such as Figure 19 As shown, the damping element is a throttling pin 302, which includes a cylindrical rod and a spiral groove 303 disposed on the outer circular surface of the cylindrical rod.

[0088] Throttling pin 302 is inserted into blind hole 304 and positioned between the inlet and outlet of third flow path 403. After the lubricating oil enters the third flow path 403, it needs to pass through spiral groove 303 and then flow out from the outlet of the third flow path 403. The spiral groove 303 on the outer surface of the cylindrical rod forms a damping hole, which plays a damping role and effectively reduces the flow of lubricating oil.

[0089] Preferred, such as Figure 11-12 As shown, the third flow path 403 includes a blind hole 304 extending radially along the moving disk 2, an oil inlet 306 near the bottom of the blind hole 304, and an oil outlet 305 away from the bottom of the blind hole 304. A second plug 702 is provided at the opening of the blind hole 304. The second flow path 402 intersects with the blind hole 304. When the moving disk 2 rotates, the inlet of the second flow path 402 is intermittently connected with the outlet of the first flow path 401. The inlet of the oil inlet 306 is the inlet of the third flow path 403, and the outlet of the oil outlet 305 is the outlet of the third flow path 403.

[0090] The blind hole 304 is easy to process; it allows the second flow path 402 to intersect with the blind hole 304. Before the air pressure in the first flow path 401 exceeds the preset pressure, the first flow path 401 is not opened. This allows the lubricating oil to flow out not only from the oil outlet 305 after entering the blind hole 304, but also from the inlet of the second flow path 402, so that the lubricating oil can flow more evenly between the first plane 101 and the second plane 201.

[0091] like Figure 13-18 As shown, in the radial direction of the moving disk 2, the oil outlet 305 is located inside the second flow path 402; a second slider 502 is provided in the blind hole 304 between the oil outlet 305 and the second flow path 402, and the second slider 502 always separates the oil outlet 305 and the second flow path 402.

[0092] The second slider 502 can slide within the blind hole 304. A second spring 602 is provided between the second slider 502 and the second plug 702. A second rod 802 is provided on the end face of the second plug 702 facing the blind hole 304. When the second slider 502 abuts against the second rod 802, the second slider 502 can block part of the second flow path 402.

[0093] By setting the second slider 502 to separate the oil outlet 305 and the second flow path 402, the lubricating oil only flows out from the oil outlet 305, and the gas flowing out of the first flow path 401 will not interfere with the lubricating oil in the blind hole 304. This allows the lubricating oil to flow more smoothly into the gap between the first plane 101 and the second plane 201. At the same time, it also prevents the lubricating oil from being carried into the back pressure chamber 3 (the lubricating oil enters the second flow path 402 and, driven by the gas in the second flow path 402, flows downward into the back pressure chamber 3), reducing the amount of lubricating oil in the circuit and avoiding oil shortage in the oil sump.

[0094] When the rotating disk 2 rotates at a high speed (high-frequency operation), the amount of gas flowing from the compression chamber into the first flow path 401 increases. This gas then enters the back pressure chamber 3 through the second flow path 402, causing an excessive increase in pressure within the back pressure chamber 3. This excessive pressure increase in the back pressure chamber 3 increases the friction between the first plane 101 and the second plane 201. The centrifugal force generated by the rotation of the rotating disk 2 causes the second slider 502 to move outwards, compressing the second spring 602 and partially blocking the second flow path 402. The partial blockage of the second flow path 402 increases the damping of the airflow, thereby reducing the amount of gas entering the back pressure chamber 3. This results in a smaller increase in pressure in the back pressure chamber 3 when the rotating disk 2 rotates at high speed (the pressure in the back pressure chamber 3 will still increase, but less significantly), preventing excessive friction between the first plane 101 and the second plane 201. The higher the rotational speed of the rotating disk 2, the more... Figure 15-18 As shown, the larger the area of ​​the second slider 502 that blocks the second flow path 402, the smaller the flow area of ​​the second flow path 402. Figure 18 As shown, ( Figure 18 The second rod 802 is shown in the middle (part of the second spring 602 is removed). The setting of the second rod 802 can prevent the second slider 502 from completely blocking the second flow path 402, which would cause a sudden and significant drop in pressure in the back pressure chamber 3. By controlling the second plug 702 to adjust the position of the second rod 802, the extent to which the second slider 502 blocks the second flow path 402 can also be adjusted, that is, the minimum flow area of ​​the second flow path 402 can be adjusted (e.g., Figure 18 As shown, when the second slider 502 abuts against the second rod 802, the flow area of ​​the second flow path 402 is at its minimum, so as to avoid the pressure in the back pressure chamber 3 not increasing with the increase of the rotation speed of the moving plate 2 due to the second flow path 402 being too small (when the flow area of ​​the second flow path 402 is too small, the damping is large, and the flow rate of gas entering the back pressure chamber 3 is basically stable).

[0095] Preferred, such as Figure 14 and 18As shown, a second groove 902 is provided on the inner wall surface of the blind hole 304 between the damping member and the oil outlet 305, and the side of the second slider 502 facing the oil inlet 306 is flush with the inner wall cross-section of the oil outlet 305 near the second flow path 402.

[0096] A second groove 902 is provided, and the side of the second slider 502 facing the oil inlet 306 is flush with the inner wall of the oil outlet near the second flow path 402. When the pump assembly is started from rest, the lubricating oil in the oil sump has not yet flowed upward along the central hole of the crankshaft 308. At this time, the lubricating oil in the second groove 902 flows upward along the inner wall of the second groove 902, the side of the second slider 502 facing the oil inlet 306, and the inner wall of the oil outlet 305 under the action of centrifugal force, and enters the gap between the first plane 101 and the second plane 201. This effectively accelerates the flow of lubricating oil into the gap between the first plane 101 and the second plane 201, improves the axial lubrication between the moving plate 2 and the stationary plate 1, and further ensures the stability of the pump operation.

[0097] To further prevent the second slider 502 from sliding towards the second flow path 402 due to centrifugal force during the initial startup of the pump assembly, a stop bar can be provided in the second groove 902. The second spring 602 gives the second slider 502 a force to slide towards the oil inlet 306, and the second slider 502 is blocked by the stop bar. In this way, during the initial startup of the pump, due to the action of the second spring 602, the second slider 502 will not slide towards the second flow path 402. That is, during the initial operation of the pump assembly, it can still be ensured that the side of the second slider 502 facing the oil inlet 306 is flush with the inner wall cross-section of the oil outlet 305 near the second flow path 402.

[0098] The present invention also provides a scroll compressor, including the pump body assembly.

[0099] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0100] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A pump body assembly for a scroll compressor, characterized in that, The device includes a stationary disk (1) and a moving disk (2) that cooperate with each other. The stationary disk (1) has a first plane (101) facing the moving disk (2), and the moving disk (2) has a second plane (201) facing the stationary disk (1). The second plane (201) can slide relative to the first plane (101). A compression cavity is formed between the stationary disk (1) and the moving disk (2), and a back pressure cavity (3) is provided on the side of the moving disk (2) facing away from the stationary disk (1). The stationary disc (1) is provided with a first flow path (401), the inlet of the first flow path (401) leads to the compression chamber, and the outlet of the first flow path (401) is located on the first plane (101); the moving disc (2) is provided with a second flow path (402), the inlet of the second flow path (402) is located on the second plane (201) and can communicate with the outlet of the first flow path (401), and the outlet of the second flow path (402) leads to the back pressure chamber (3). A switching device is provided in the first flow path (401). When the pressure of the gas entering the first flow path (401) through the inlet of the first flow path (401) is greater than the preset pressure, the first flow path (401) is opened. When the first flow path (401) is opened, the gas discharged from the compression chamber can enter the back pressure chamber (3) in sequence through the first flow path (401) and the second flow path (402).

2. The pump body assembly according to claim 1, characterized in that, The first flow path (401) includes intersecting first passage A (4011), first passage B (4012) and first passage C (4013), and the outlet of the first passage C (4013) is the outlet of the first flow path (401); The first passage A (4011) and the first passage B (4012) are respectively located on both sides of the first passage C (4013); the inlet of the first passage A (4011) leads to the compression chamber; The switching device includes a first slider (501), which is capable of sliding in a sealed manner within the first passage A (4011) and the first passage B (4012). The first slider (501) is capable of sliding from the first passage A (4011) to the first passage B (4012) under the pressure of the gas in the compression chamber.

3. The pump body assembly according to claim 2, characterized in that, The first pathway A (4011), the first pathway B (4012), and the first pathway C (4013) constitute a T-shaped pathway; The first passage A (4011) and the first passage B (4012) are coaxial. The first end of the first passage B (4012) leads to the first passage A (4011), and the second end of the first passage B (4012) leads to the outer side of the stationary plate (1). An elastic element is provided on the side of the first slider (501) facing the second end of the first passage B (4012). When the first slider (501) slides from the first passage A (4011) to the first passage B (4012) to connect the first passage A (4011) and the first passage C (4013), the first slider (501) squeezes the elastic element.

4. The pump body assembly according to claim 3, characterized in that, The second end of the first passage B (4012) is provided with a first plug (701). The first plug (701) includes a first rod (801) extending into the first passage B (4012). The elastic element is a first spring (601). The first end of the first spring (601) is connected to the first rod (801), and its second end is connected to the first slider (501). Controlling the first plug (701) can adjust the position of the first rod (801) in the first passage B (4012).

5. The pump body assembly according to claim 4, characterized in that, The first slider (501) has a first groove (901) at one end facing the first plug (701), and the second end of the first spring (601) is located in the first groove (901).

6. The pump body assembly according to any one of claims 1-5, characterized in that, A ring cylinder (301) is provided at the lower middle part of the moving disk (2), and the axis of the ring cylinder (301) is parallel to the axis of the moving disk (2). The moving plate (2) is provided with a third flow path (403), the inlet of the third flow path (403) leads to the interior of the ring cylinder (301), and the outlet of the third flow path (403) is located on the second plane (201); the third flow path (403) is provided with a damping element that can reduce the liquid flow velocity.

7. The pump body assembly according to claim 6, characterized in that, The damping element is a throttling pin (302), which includes a cylindrical rod and a spiral groove (303) disposed on the outer circular surface of the cylindrical rod.

8. The pump body assembly according to claim 7, characterized in that, The third flow path (403) includes a blind hole (304) extending radially along the moving disk (2), an oil inlet (306) near the bottom of the blind hole (304), and an oil outlet (305) away from the bottom of the blind hole (304). A second plug (702) is provided at the opening of the blind hole (304). The second flow path (402) intersects with the blind hole (304). When the moving disk (2) rotates, the inlet of the second flow path (402) is intermittently connected with the outlet of the first flow path (401). The inlet of the oil inlet (306) is the inlet of the third flow path (403), and the outlet of the oil outlet (305) is the outlet of the third flow path (403).

9. The pump assembly according to claim 8, characterized in that, In the radial direction of the moving disk (2), the oil outlet (305) is located inside the second flow path (402); a second slider (502) is provided in the blind hole (304) between the oil outlet (305) and the second flow path (402), and the second slider (502) always separates the oil outlet (305) and the second flow path (402); The second slider (502) can slide within the blind hole (304). A second spring (602) is provided between the second slider (502) and the second plug (702). A second rod (802) is provided on the end face of the second plug (702) facing the blind hole (304). When the second slider (502) abuts against the second rod (802), the second slider (502) can block part of the second flow path (402).

10. The pump body assembly according to claim 9, characterized in that, A second groove (902) is provided on the inner wall surface of the blind hole (304) between the damping member and the oil outlet (305). The side of the second slider (502) facing the oil inlet (306) is flush with the inner wall cross-section of the oil outlet (305) near the second flow path (402).

11. A scroll compressor, characterized in that, Includes the pump body assembly as described in any one of claims 1-10.

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