Pump body assembly and fluid machine

Abstract

The application provides a pump body assembly and a fluid machine. The pump body assembly comprises a cylinder, a buffer groove and a communication groove which are connected, and a filter screen assembly. The filter screen assembly is arranged in the buffer groove and covers one side of the communication groove close to the buffer groove in the radial direction of the cylinder. The application solves the problems of large size of the fluorine pump, inability to install in a narrow and compact space, and high packaging cost in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fluid machinery, in particular to a pump body assembly and a fluid machinery. BACKGROUND

[0002] In the field of data center, computer room air conditioner, etc., a liquid pump is used to replace a compressor to drive refrigerant to run in the system, and the pump driving the refrigerant to run is called a fluorine pump. Various impurities are generated in the production process of the fluorine pump. In order to ensure the stability of the fluorine pump, filtration is required. The traditional scheme is to install a filter at the inlet of the fluorine pump. Since the size of the fluorine pump with the filter is much larger than that of the fluorine pump without the filter, a larger space needs to be reserved for the installation of the fluorine pump, which leads to the fluorine pump being unable to be installed in a narrow and compact space. At the same time, the packaging size of the fluorine pump with the filter is also greatly increased, which increases the packaging cost. SUMMARY

[0003] The main purpose of the present application is to provide a pump body assembly and a fluid machinery to solve the problem of large size of fluorine pump in the prior art which cannot be installed in a narrow and compact space and high packaging cost.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a pump body assembly includes a cylinder, the cylinder has a buffer groove and a communication groove which are connected in communication, and along the radial direction of the cylinder, the buffer groove is located on the outer side of the communication groove; a filter screen assembly is arranged inside the buffer groove, and the filter screen assembly can cover one side of the communication groove close to the buffer groove.

[0005] Further, the filter screen assembly is attached to the surface of the side of the communication groove close to the buffer groove; or the filter screen assembly divides the space in the buffer groove into a pre-filtering area and a post-filtering area, and at least a part of the surface of the side of the filter screen assembly facing the post-filtering area is spaced apart from the surface of the side of the communication groove close to the buffer groove to form the post-filtering area.

[0006] Further, the filter screen assembly is arranged as a protrusion along the radial direction of the cylinder away from the communication groove.

[0007] Further, the filter screen assembly abuts the inner wall of the buffer groove at least through three supporting positions.

[0008] Further, the positions where the filter screen assembly abuts the inner wall of the buffer groove are located on a set of opposite surfaces of the buffer groove.

[0009] Further, the filter screen assembly is an arc-shaped structure, and the two ends of the filter screen assembly in the circumferential direction of the cylinder form a first abutting portion and a second abutting portion respectively for abutting the inner wall of the buffer groove, and the vertex of the arc-shaped structure abuts the inner wall of the buffer groove to form a third abutting portion.

[0010] Further, the communication region between the communication groove and the buffer groove is located between the first abutting portion and the second abutting portion.

[0011] Further, the linear distance between the two edges of the communication region in the circumferential direction of the cylinder is L1, the connecting line between the first abutting portion and the second abutting portion is L2, and the length of L1 is less than the length of L2.

[0012] Further, the length difference between L1 and L2 is greater than or equal to 2 mm.

[0013] Further, the connecting line between the first abutting portion and the second abutting portion is L2, the vertical distance from the third abutting portion to L2 when the filter screen assembly is located in the interior of the buffer groove is L3, the vertical distance from the third abutting portion to L2 when the filter screen assembly is not installed in the interior of the buffer groove is L4, and L4 / L3 satisfies: 0.9

[0014] Further, the height Hq of the cylinder and the height H1 of the filter screen assembly satisfy: Hq - H1 = ± 0.005 mm.

[0015] Further, the pump body assembly further comprises an upper flange and a lower flange located at the axial two ends of the cylinder, and the surface of the upper flange and / or the lower flange towards the side of the cylinder is provided with a containing groove for placing the filter screen assembly.

[0016] Further, along the axial direction of the cylinder, the height Hq of the cylinder, the height H1 of the filter screen assembly, the depth H2 of the containing groove on the upper flange, and the depth H3 of the containing groove on the lower flange satisfy: Hq + H2 + H3 - H1 = ± 0.005 mm.

[0017] Further, the filter screen assembly is of an elastic structure, and the inner wall of the buffer groove extrudes the filter screen assembly and causes the filter screen assembly to be deformed and supported in the buffer groove.

[0018] Further, the filter screen assembly comprises an outer framework, the abutment of the outer framework with the buffer groove, and the outer framework has a mounting region; a net body provided at the mounting region.

[0019] Further, the end portion of the outer framework has a turn-up structure, and the turn-up structure is folded towards the side away from the communication groove.

[0020] Further, the turn-up structure is arc-shaped or right-angled.

[0021] Further, the filter screen assembly further comprises an inner framework provided on the net body, and at least part of the inner framework is connected with the outer framework.

[0022] Further, the inner framework is in a strip structure and is formed by multiple bending; or the inner framework extends in the length and width directions of the filter screen assembly; or the inner framework comprises multiple support segments, and adjacent two support segments are arranged at intervals.

[0023] According to another aspect of the present application, a fluid machine is provided, comprising the pump body assembly.

[0024] Further, the fluid machine is a fluorine pump.

[0025] By using the technical solution of the present application, the following technical effects are achieved:

[0026] By opening the buffer groove on the cylinder body and arranging the filter screen assembly inside the buffer groove, a filter is not needed to be arranged separately, and the size of the entire pump body assembly can be reduced. Since the filter screen assembly is arranged directly inside the pump body assembly, the filter screen assembly can be installed on the cylinder body alone or integrated with the sealing ring and installed together with the sealing ring. By arranging the filter screen assembly inside, the installation space of the pump body assembly is reduced, the fluorine pump containing the pump body assembly can be installed in a narrow and compact space, and the size of the outer packaging box of the fluorine pump is smaller. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the exemplary embodiments of the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 Fig. 1 shows a schematic diagram of the overall structure of the pump body assembly of the present application;

[0029] Figure 2 Fig. 2 shows a sectional view of the pump body assembly of the present application;

[0030] Figure 3 Fig. 3 shows a schematic diagram of the structure of the cylinder body of the present application;

[0031] Figure 4 Fig. 4 shows a top view of the cylinder body of the present application;

[0032] Figure 5 Fig. 5 shows a schematic diagram of the structure of the filter screen assembly of the present application;

[0033] Figure 6 Fig. 6 shows a schematic diagram of the structure of the filter screen assembly of the present application;

[0034] Figure 7 Fig. 7 shows an exploded view of the pump body assembly of the present application.

[0035] In the above drawings, the following reference signs are used:

[0036] 10, cylinder; 20, filter screen assembly; 21, first abutting portion; 22, second abutting portion; 23, third abutting portion; 24, outer skeleton; 241, flange structure; 25, screen body; 26, inner skeleton; 30, buffer groove; 31, pre-filtering area; 32, post-filtering area; 40, communication groove; 50, upper flange; 51, accommodating groove; 60, lower flange. DETAILED DESCRIPTION

[0037] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0039] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0040] In order to solve the problem that the fluorine pump in the prior art is too large in size to be installed in a narrow and compact space and has high packaging cost, the present application provides a fluid machine, wherein the fluid machine is a fluorine pump, and the fluorine pump comprises a pump body assembly.

[0041] Referring to Figures 1 to 5 , the pump body assembly comprises a cylinder 10 and a filter screen assembly 20, the cylinder 10 is provided with a buffer groove 30 and a communication groove 40 in communication, along the radial direction of the cylinder 10, the buffer groove 30 is located on the outer side of the communication groove 40, the filter screen assembly 20 is arranged inside the buffer groove 30, and the filter screen assembly 20 can cover one side of the communication groove 40 close to the buffer groove 30.

[0042] By opening the buffer groove 30 on the cylinder 10 and arranging the filter screen assembly 20 inside the buffer groove 30, a filter is not needed to be arranged separately, and the size of the entire pump body assembly can be reduced. At the same time, since the filter screen assembly 20 is arranged directly inside the pump body assembly, the filter screen assembly 20 can be installed on the cylinder 10 separately, or can be made into an integral whole with the sealing ring and installed together with the sealing ring. By arranging the filter screen assembly 20 inside, the installation space of the pump body assembly is reduced, the fluorine pump containing the pump body assembly can be installed in a narrow and compact space, and the volume of the outer packaging box of the fluorine pump is smaller.

[0043] In the embodiment, the filter screen assembly 20 is attached to the surface of the communication groove 40 near the side of the buffer groove 30.

[0044] Specifically, since the filter screen assembly 20 mainly plays a filtering role to filter the impurities of the fluid entering the pump body, and the fluid needs to pass through the communication groove 40 in the process of entering the pump body, the filter screen assembly 20 is attached to the surface of the communication groove 40 near the side of the buffer groove 30 to realize the filtering of the fluid entering the pump body.

[0045] In another embodiment, the filter screen assembly 20 divides the space in the buffer groove 30 into a pre-filtering area 31 and a post-filtering area 32, and at least a part of the surface of the filter screen assembly 20 towards the post-filtering area 32 is spaced apart from the surface of the communication groove 40 near the side of the buffer groove 30 to form the post-filtering area 32.

[0046] Since the fluid entering the buffer groove 30 will be filtered by the filter screen assembly 20 located in the buffer groove 30, the filter screen assembly 20 can divide the buffer groove 30 into a pre-filtering area 31 and a post-filtering area 32. In order to ensure the filtering effect, the fluid needs to pass through the filter screen before entering the communication groove 40, so the post-filtering area 32 is formed by spacing at least a part of the surface of the filter screen assembly 20 towards the post-filtering area 32 from the surface of the communication groove 40 near the side of the buffer groove 30. This realizes the filtering of the fluid entering the pump body.

[0047] In the embodiment, the filter screen assembly 20 is arranged along the radial direction of the cylinder body 10 towards the protrusion away from the communication groove 40.

[0048] Through the protrusion arrangement of the filter screen assembly 20, the filter screen assembly 20 can be tightly fitted with the buffer groove 30, thereby increasing the stability of the filter screen installation.

[0049] In the embodiment, the filter screen assembly 20 abuts against the inner wall of the buffer groove 30 through at least three supporting positions.

[0050] Specifically, the two ends of the filter screen and the peripheral wall of the filter screen assembly 20 abut against the inner wall of the buffer groove 30 through three supporting positions, which can make the filter screen assembly 20 tightly fit with the buffer groove 30, thereby increasing the stability of the filter screen assembly 20 installation. In other embodiments, the peripheral wall of the filter screen assembly 20 can have multiple supporting positions with the inner wall of the buffer groove 30, further increasing the stability of the filter screen assembly 20 installation.

[0051] In the embodiment, the position where the filter screen assembly 20 abuts against the inner wall of the buffer groove 30 is located on a set of opposite surfaces of the buffer groove 30.

[0052] In order to better stabilize the installation of the filter screen assembly 20 in the buffer groove 30, the filter screen assembly 20 should be close to the buffer groove 30 in the buffer groove 30, in order to realize the clamping of the filter screen assembly 20, the position of the filter screen assembly 20 abutting against the inner wall of the buffer groove 30 is located on a set of opposite surfaces of the buffer groove 30, at this time the filter screen assembly 20 is clamped by a set of opposite side walls of the buffer groove 30, thereby realizing the stability of the installation of the filter screen assembly 20.

[0053] Referring to Figure 6 , the filter screen assembly 20 is an arc structure, the filter screen assembly 20 is located at both ends of the circumferential direction of the cylinder body 10 to form a first abutting portion 21 and a second abutting portion 22, respectively, for abutting against the inner wall surface of the buffer groove 30, and the vertex of the arc structure abuts against the inner wall of the buffer groove 30 to form a third abutting portion 23.

[0054] Specifically, since the cylinder body 10 is generally circular, the buffer groove 30 opened on the cylinder body 10 should be circular arc, and the corresponding filter screen assembly 20 should also be arc-shaped in order to be placed into the buffer groove 30. However, in order to increase the stability of the installation of the filter screen assembly 20, the filter screen assembly 20 should have multiple abutting connection points with the groove wall of the buffer groove 30, so the filter screen assembly 20 is located at both ends of the circumferential direction of the cylinder body 10 to form a first abutting portion 21 and a second abutting portion 22, respectively, for abutting against the inner wall surface of the buffer groove 30, and the vertex of the arc structure abuts against the inner wall of the buffer groove 30 to form a third abutting portion 23, thereby realizing the clamping connection between the filter screen assembly 20 and the buffer groove 30, and realizing the stable installation of the filter screen assembly 20.

[0055] In the present embodiment, the communication area of the communication groove 40 and the buffer groove 30 is located between the first abutting portion 21 and the second abutting portion 22.

[0056] Since the filter screen assembly 20 mainly plays a filtering role to filter the impurities of the fluid entering the pump body, and the fluid needs to pass through the communication groove 40 in the process of entering the pump body. In order to ensure that the filtering process can be stably carried out, the communication area of the communication groove 40 and the buffer groove 30 is arranged between the first abutting portion 21 and the second abutting portion 22, so as to avoid the presence of unfiltered fluid.

[0057] Referring to Figure 5 , the straight line distance between the two edge limits of the circumferential direction of the cylinder body 10 is L1, the connecting line between the first abutting portion 21 and the second abutting portion 22 is L2, and the length of L1 is less than the length of L2.

[0058] In order to ensure that the filter screen can filter all the fluid entering into the communication groove 40, the straight-line distance between the two edges of the communication area in the circumferential direction of the cylinder body 10 needs to be less than the distance of the line connecting the first abutting portion 21 and the second abutting portion 22, so that the communication area can be stably arranged between the first abutting portion 21 and the second abutting portion 22.

[0059] Preferably, the length difference between L1 and L2 is greater than or equal to 2 mm.

[0060] In order to further ensure that the communication area of the communication groove 40 and the buffer groove 30 is located between the first abutting portion 21 and the second abutting portion 22, the length difference between L1 and L2 is greater than or equal to 2 mm, so that the filter screen can better cover the communication groove 40 and increase the stability of the filtering process.

[0061] Referring to Figure 5 , the line connecting the first abutting portion 21 and the second abutting portion 22 is L2, the vertical distance from the third abutting portion 23 to L2 when the filter screen assembly 20 is located in the interior of the buffer groove 30 is L3, and the vertical distance from the third abutting portion 23 to L2 when the filter screen assembly 20 is not installed in the interior of the buffer groove 30 is L4, wherein L3 / L4 satisfies: 0.9

[0062] In order to increase the stability of the installation of the filter screen assembly 20 into the buffer groove 30, it is necessary to make the filter screen assembly 20 tightly abut against the inner wall of the buffer groove 30, so before the installation of the filter screen assembly 20, the vertical distance L4 from the third abutting portion 23 to the line connecting the first abutting portion 21 and the second abutting portion 22 is greater than the vertical distance L3 from the third abutting portion 23 to the line connecting the first abutting portion 21 and the second abutting portion 21 after the installation of the filter screen. In this way, when the filter screen is installed into the buffer groove 30, the filter screen assembly 20 will be deformed by extrusion, thereby achieving the extrusion fixation of the filter screen assembly 20. When the ratio of L3 / L4 is less than 0.9, the filter screen assembly 20 will be deformed greatly during the installation of the filter screen assembly 20, which is not conducive to the installation of the filter screen assembly 20. When the ratio of L3 / L4 is greater than 0.95, the deformation of the filter screen assembly 20 is small, which is not conducive to the fixation of the filter screen assembly 20.

[0063] In the embodiment, along the axial direction of the cylinder body 10, the height Hq of the cylinder body 10 and the height H1 of the filter screen assembly 20 satisfy: Hq-H1=±0.005 mm.

[0064] During actual production and processing, there will be errors between the height Hq of the cylinder body 10 and the height H1 of the filter screen assembly 20, but in order to ensure the stability of the installation of the filter screen, the height difference between the cylinder body 10 and the filter screen assembly 20 needs to be maintained at 0.005 mm, and a large error will affect the installation of the filter screen assembly 20 or the sealing performance of the installation of the remaining components of the pump body assembly.

[0065] Referring to Figure 7 The pump body assembly further comprises an upper flange 50 and a lower flange 60 located at the axial two ends of the cylinder body 10, and the surface of the upper flange 50 and / or the lower flange 60 towards the side of the cylinder body 10 is provided with a receiving groove 51 for placing the filter screen assembly 20.

[0066] In order to further increase the stability of the installation of the filter screen assembly 20, the upper flange 50 or the lower flange 60 of the pump body assembly is provided with a receiving groove 51 for installing the filter screen assembly 20, and the filter screen assembly 20 is further limited and fixed by the receiving groove 51. In actual production process, the receiving groove 51 can be only provided on the upper flange 50 or the lower flange 60, or the receiving groove 51 can be provided on both the upper flange 50 and the lower flange 60 according to actual needs.

[0067] In the embodiment, along the axial direction of the cylinder body 10, the height Hq of the cylinder body 10, the height H1 of the filter screen assembly 20, the depth H2 of the receiving groove 51 on the upper flange 50, and the depth H3 of the receiving groove 51 on the lower flange 60 satisfy: Hq + H2 + H3 - H1 = ±0.005mm.

[0068] In actual production process, there will be errors between the actual production data and the theoretical data of the height Hq of the cylinder body 10 (the height of the buffer groove 30), the height H1 of the filter screen assembly 20, the depth H2 of the receiving groove 51 on the upper flange 50, and the depth H3 of the receiving groove 51 on the lower flange 60. However, in order to ensure the stability of the installation of the filter screen, the height difference between the height of the filter screen assembly 20 and the height of the buffer groove 30 and the receiving groove 51 needs to be maintained at 0.005mm, and a large error will affect the installation of the filter screen assembly 20 or the sealing of the installation of the remaining components of the pump body assembly. When H2 or H3 is 0, it means that the corresponding receiving groove 51 is not provided on the upper flange 50 or the lower flange 60.

[0069] In the present application, the filter screen assembly 20 is a resilient structure, and the inner wall of the buffer groove 30 extrudes the filter screen assembly 20 and causes the filter screen assembly 20 to deform and support in the buffer groove 30.

[0070] In order to increase the stability of the installation of the filter screen assembly 20, the filter screen assembly 20 needs to be clamped in the buffer groove 30, and in order to ensure the stability of the clamping, the filter screen assembly 20 needs to have a certain elasticity. When the filter screen assembly 20 is installed in the buffer groove 30, the inner wall of the buffer groove 30 will extrude the filter screen assembly 20 to cause the filter screen assembly 20 to deform, so that the filter screen assembly 20 can be clamped in the buffer groove 30, thereby increasing the stability of the installation of the filter screen assembly 20.

[0071] Referring to Figure 6The filter screen assembly 20 comprises an outer frame 24 and a screen body 25. The outer frame 24 is in abutment with the buffer groove 30 and has a mounting area. The screen body 25 is arranged at the mounting area.

[0072] Specifically, the outer frame 24 mainly plays a supporting and connecting role. During installation, the outer frame 24 is in abutment with the inner wall of the buffer groove 30. The screen body 25 mainly plays a filtering role to prevent impurities in the fluid from entering the cylinder body 10. The screen body 25 is soft, so it needs an internal frame to help it bear the impact force of the fluid, and the external frame needs to be closely attached to the buffer groove 30. Its external contour must be neat and not easy to deform to closely attach to the buffer groove 30. In order to prevent the filter screen from being loosely attached to the buffer groove 30 and leaking, the filter screen and the buffer groove 30 adopt an interference fit form. Therefore, the external frame of the filter screen not only needs to be firm and not easy to deform, but also needs to be made of elastic material. After slight deformation, a large elastic force will be generated. The elastic force will clamp the filter screen in the buffer groove 30 and prevent it from shaking under the impact of the fluid.

[0073] Referring to Figure 6 The end of the outer frame 24 has a flange structure 241 that is folded away from the communication groove 40. The flange structure 241 is arc-shaped or right-angled.

[0074] By arranging the flange structure 241, the outer frame 24 will be more easily deformed and will be more easily clamped in the buffer groove 30 and closely attached to the buffer groove 30 during assembly.

[0075] In the present application, the filter screen assembly 20 further comprises an internal frame 26 arranged on the screen body 25. At least part of the internal frame 26 is connected to the outer frame 24.

[0076] When the fluid passes through the screen body 25, the screen body 25 will produce a certain blocking effect on the fluid. Thus, the fluid will also produce an acting force on the screen body 25, especially when there are larger impurities on the screen body 25. Since the screen body 25 is soft, the acting force generated by the fluid flow on the screen body 25 may cause damage to the screen body 25. Therefore, the internal frame 26 is arranged on the screen body 25 to increase the structural strength of the screen body 25 and increase the stability of the filter screen.

[0077] In the present application, the internal frame 26 is in a strip-shaped structure and is formed by multiple bending; or the internal frame 26 extends in the length and width directions of the filter screen assembly 20; or the internal frame 26 comprises multiple support segments and is arranged in a spaced manner between adjacent two support segments.

[0078] The inner framework 26 can be of different shapes, but needs to extend along the length and width of the filter screen for the transmission of force to transmit the force on the screen body 25 to the outer framework 24. Therefore, the inner framework 26 can be one piece or multiple pieces. When the inner framework 26 is one piece, the inner framework 26 needs to extend along the length and width of the filter screen, so the inner framework 26 can be formed by multiple bends.

[0079] From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:

[0080] 1. By opening the buffer groove 30 on the cylinder body 10, the filter screen assembly 20 is arranged inside the buffer groove 30, so that a separate filter is not needed, and the size of the entire pump body assembly can be reduced. At the same time, since the filter screen assembly 20 is directly arranged inside the pump body assembly, the filter screen assembly 20 can be separately mounted on the cylinder body 10, or can be made as a whole with the sealing ring, and the filter screen assembly 20 is installed together when the sealing ring is installed. By embedding the filter screen assembly 20, the installation space of the pump body assembly is reduced, so that the fluorine pump containing the pump body assembly can be installed in a space-limited and compact environment, and the volume of the outer packaging box of the fluorine pump is smaller.

[0081] 2. In order to increase the stability of the installation of the filter screen assembly 20, the filter screen assembly 20 needs to be clamped in the buffer groove 30. In order to ensure the stability of the clamping, the filter screen assembly 20 needs to have a certain elasticity. When the filter screen assembly 20 is installed in the buffer groove 30, the inner wall of the buffer groove 30 will extrude the filter screen assembly 20 to cause the filter screen assembly 20 to deform, so that the filter screen assembly 20 can be clamped in the buffer groove 30, and the stability of the installation of the filter screen assembly 20 is increased.

[0082] 3. When the fluid passes through the screen body 25, the screen body 25 will produce a certain blocking effect on the fluid, so that the fluid will also produce an action force on the screen body 25, especially when there are larger impurities on the screen body 25, the action force will be larger. Since the screen body 25 is soft, the action force of the fluid flow on the screen body 25 can cause damage to the screen body 25, so the inner framework 26 is arranged on the screen body 25 to increase the structural strength of the screen body 25 and increase the stability of the filter screen work. Obviously, the above-described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should belong to the scope of protection of the present application.

[0083] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, as the scope of the exemplary embodiments of this application is limited only by the appended claims. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Also, unless otherwise indicated herein, the materials described herein can be used in a variety of applications.

[0084] It should be noted that the terms "first", "second", and the like, as used herein, are intended to modify any one of the identified objects, but not necessarily in the chronological or sequential order. It should be understood that the use of such terms is merely for distinguishing between two or more objects that are described separately from one another.

[0085] The preferred embodiments of the application are described herein with reference to the accompanying drawings, in which the same or similar elements in the drawings are referred to with the same or similar reference numerals. The application is not limited to the preferred embodiments, but can be practiced with modification and alteration within the scope of the present application. Accordingly, the specification and drawings, including the embodiments, are illustrative in nature and not restrictive, since the scope of the application is defined by the appended claims.

Claims

1. A pump body assembly, characterized by, The pump body assembly comprises: a cylinder (10) having a buffer groove (30) and a communication groove (40) connected therewith, the buffer groove (30) being located at the outer side of the communication groove (40) along the radial direction of the cylinder (10); a filter screen assembly (20) arranged inside the buffer groove (30) and capable of covering one side of the communication groove (40) close to the buffer groove (30); the filter screen assembly (20) is in an arc structure, two ends of the filter screen assembly (20) in the circumferential direction of the cylinder (10) respectively form a first abutting portion (21) and a second abutting portion (22) for abutting with the inner wall of the buffer groove (30), and the vertex of the arc structure abuts with the inner wall of the buffer groove (30) to form a third abutting portion (23); the line between the first abutting portion (21) and the second abutting portion (22) is L2, when the filter screen assembly (20) is arranged inside the buffer groove (30), the vertical distance from the third abutting portion (23) to the L2 is L3; when the filter screen assembly (20) is not arranged inside the buffer groove (30), the vertical distance from the third abutting portion (23) to the L2 is L4; wherein L4 / L3 satisfies: 0.9 2. The pump body assembly according to claim 1, wherein the filter screen assembly (20) is attached to the surface of the side of the communication groove (40) close to the buffer groove (30); or the filter screen assembly (20) divides the space in the buffer groove (30) into a pre-filtering area (31) and a post-filtering area (32), and at least a part of the surface of the filter screen assembly (20) towards the post-filtering area (32) is arranged apart from the surface of the side of the communication groove (40) close to the buffer groove (30) to form the post-filtering area (32).

3. The pump body assembly of claim 1, wherein, The filter screen assembly (20) is arranged in a protrusion away from the communication groove (40) along the radial direction of the cylinder (10).

4. The pump body assembly of claim 1, wherein, The filter screen assembly (20) abuts with the inner wall of the buffer groove (30) through at least three supporting positions.

5. The pump body assembly of claim 1, wherein, The positions where the filter screen assembly (20) abuts with the inner wall of the buffer groove (30) are located on a set of opposite surfaces of the buffer groove (30).

6. The pump body assembly of claim 1, wherein, The communication area of the communication groove (40) and the buffer groove (30) is located between the first abutting portion (21) and the second abutting portion (22).

7. The pump body assembly according to claim 6, wherein the straight-line distance between the two edges of the communication area in the circumferential direction of the cylinder (10) is L1, the line between the first abutting portion (21) and the second abutting portion (22) is L2, and the length of the L1 is smaller than the length of the L2.

8. The pump body assembly of claim 7, wherein, The length difference between the L1 and the L2 is greater than or equal to 2 mm.

9. The pump body assembly of claim 1, wherein, Along the axial direction of the cylinder body (10), the height Hq of the cylinder body (10) and the height H1 of the filter screen assembly (20) satisfy: Hq - H1 = ± 0.005 mm.

10. The pump body assembly of claim 1, wherein, The pump body assembly further comprises an upper flange (50) and a lower flange (60) located at the axial ends of the cylinder body (10), and the surface of the upper flange (50) and / or the lower flange (60) towards the side of the cylinder body (10) is provided with a containing groove (51) for placing the filter screen assembly (20).

11. The pump body assembly of claim 10, wherein, Along the axial direction of the cylinder body (10), the height Hq of the cylinder body (10), the height H1 of the filter screen assembly (20), the depth H2 of the containing groove (51) on the upper flange (50), and the depth H3 of the containing groove (51) on the lower flange (60) satisfy: Hq + H2 + H3 - H1 = ± 0.005 mm.

12. The pump body assembly of any one of claims 1 to 11, wherein, The filter screen assembly (20) is of elastic structure, and the inner wall of the buffer groove (30) extrudes the filter screen assembly (20) and causes the filter screen assembly (20) to be supported in the buffer groove (30) after deformation.

13. The pump body assembly of any one of claims 1 to 8, wherein, The filter screen assembly (20) comprises: An outer framework (24) abutting against the buffer groove (30), the outer framework (24) having a mounting area; A net body (25) provided at the mounting area.

14. The pump body assembly of claim 13, wherein, The end of the outer framework (24) has a turn-up structure (241) folded towards the side away from the communication groove (40).

15. The pump body assembly of claim 14, wherein, The turn-up structure (241) is arc-shaped or right-angled.

16. The pump body assembly of claim 13, wherein, The filter screen assembly (20) further comprises an inner framework (26) provided on the net body (25), and at least part of the inner framework (26) is connected with the outer framework (24).

17. The pump body assembly according to claim 16, characterized in that, The inner framework (26) is of strip structure and is formed by multiple bending; or The inner framework (26) extends in the length and width directions of the filter screen assembly (20); or The inner framework (26) comprises multiple support segments, and adjacent two support segments are arranged in interval.

18. A fluid machine characterized by, A pump body assembly according to any one of claims 1 to 17.

19. The fluid machine of claim 18, wherein, The fluid machine is a fluorine pump.

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