Front cover assembly and pump

Abstract

This utility model provides a front cover assembly and a pump. The front cover assembly includes a front cover, an annular connector, and a flange. The front cover has a fluid passage and at least one external liquid inlet. The at least one external liquid inlet communicates with the fluid passage. The at least one external liquid inlet of the front cover has an inner wall surface, an outer wall surface, an abutment end face, and a receiving groove. The inner wall surface surrounds the at least one external liquid inlet. The outer wall surface faces away from the inner wall surface. The abutment end face is connected to both the inner and outer wall surfaces. The abutment end face is flush with the at least one external liquid inlet. The receiving groove is separate from the at least one abutment end face. The annular connector is installed in the receiving groove. The flange is movably fitted onto the annular connector relative to the front cover.

Description

Technical Field

[0001] This utility model relates to a front cover assembly and a pump, and more particularly to a front cover assembly and a pump suitable for fluid transport and highly durable. Background Technology

[0002] As a core component for conveying corrosive acid and alkali solutions, the pump's front cover assembly still has many technical defects in its traditional design.

[0003] For example, the front cover assembly of existing welded fixed pumps, because its flanges, connectors and front cover are permanently joined by high temperature fusion, can prevent fluid leakage. However, when the front cover wears out and needs to be replaced, the entire front cover assembly must be replaced, which increases maintenance costs.

[0004] For another example, in the existing lockable and detachable pump front cover assembly, the flange is locked to the front cover through the thread of the connector and the interface is sealed with an O-ring. However, after the O-ring is in contact with high temperature and corrosive fluid for a long time, the O-ring is still prone to aging, elastic fatigue and chemical deterioration, which leads to a reduction in the service life of the O-ring, causing leakage of high temperature and corrosive fluid, forcing frequent shutdowns for replacement, and seriously affecting the continuity of production.

[0005] Below are some existing references regarding the front cover assembly of the pump.

[0006] Reference 1 (CN208634576U)

[0007] Reference 1 relates to a connection assembly and power unit, primarily disclosing the connection between a pipe and a flange, rather than the connection between the pump's front cover and a flange. The connection assembly in Reference 1 includes a flange core (directly connecting to the pump body pipe) and a flange plate (connecting to the pipe). A locking portion for wrench engagement is provided on the outer circumferential surface of the flange core, serving as a leverage point to stably lock the flange core onto the pump body pipe.

[0008] Reference 1 uses O-ring seals (the first sealing element). However, after prolonged contact with high-temperature and corrosive fluids, O-rings are prone to aging, elastic fatigue, and chemical deterioration, which reduces their service life, reduces their reliability in preventing fluid leakage, forces frequent shutdowns for replacement, and seriously affects production continuity.

[0009] Reference 2 (CN209483703U)

[0010] Reference 2 concerns a liquid pump casing, which mainly adopts a two-piece flange structure. By using a positioning protrusion and a positioning through hole, a snap-fit ​​movable flange that can rotate 360 ​​degrees is formed. The snap-fit ​​movable flange is fixed to the inlet and outlet of the integrally molded design by a protrusion on the outer peripheral wall.

[0011] Reference 2 uses a two-piece flange, not a one-piece flange. The structural strength of the flange after connection is far less than that of a one-piece flange, resulting in poor reliability in preventing leakage of the transported fluid.

[0012] Reference 3 (CN214368383U)

[0013] Reference 3 relates to a detachable movable flange, similar to the two-piece flange structure disclosed in Reference 2. It utilizes a first connecting block and a fourth connecting block to cooperate with each other, and the first limiting block and the fourth limiting block are correspondingly embedded in the limiting groove. It also utilizes a second connecting block and a third connecting block to cooperate with each other, and the second limiting block and the third limiting block are correspondingly embedded in the limiting groove, thereby enabling the first flange block and the second flange block to form a mutually snap-fit ​​connection.

[0014] Reference 3 uses a two-piece flange, not a one-piece flange. The structural strength of the flange after connection is far less than that of a one-piece flange, resulting in poor reliability in preventing leakage of the transported fluid.

[0015] Reference 4 (CN205663607U)

[0016] Reference 4 describes the inlet and outlet anti-leakage connection structures for two types of pumps. The first type of pump inlet and outlet anti-leakage connection structure consists of an integral flange, a stainless steel reinforcing plate, and two semi-circular pipe fasteners. The second type of structure consists of a split flange and a stainless steel reinforcing plate.

[0017] Reference 4 uses stainless steel flanges to strengthen the flange structure, solving the problem of leakage at the plastic threaded connection points of the inlet and outlet pipes of plastic chemical pumps caused by thermal expansion and contraction of the plastic threads due to fluid temperature changes. However, stainless steel flanges will also corrode in the operating environment of strong acid and alkaline chemical fluids, leading to a decrease in flange strength and causing chemical fluid leakage. The assembly process of stainless steel flanges is complex and will increase assembly time.

[0018] Reference 5 (CN206246344U)

[0019] Reference 5 pertains to a front cover of a chemical pump, comprising a chemical pump discharge unit, a chemical pump front cover unit, and a chemical pump suction unit. The front cover of the pump in Reference 5 is a single, integrally molded structure.

[0020] Reference 5 is a one-piece molded front cover. Due to its complex shape and structure, the molding mold is also very complex and expensive. When the front cover needs to be replaced, the entire front cover needs to be replaced, resulting in high maintenance costs.

[0021] Therefore, existing technologies cannot fundamentally solve the many defects of the front cover assembly of existing pumps, such as low reliability in preventing leakage of transported fluids, poor overall structural strength, low ease of assembly, and high maintenance costs.

[0022] For example, while detachable movable flanges offer the advantage of easy installation, compared to one-piece flanges, the clamping force between this type of combined flange and the clamping element is weaker. This causes the sealing effect to decline over time, increasing the risk of leakage of the transported fluid. Even if metal parts are added to increase the connection strength between the combined flange and the clamping element, metal parts with poor corrosion resistance will still corrode in corrosive fluid environments over a long period, affecting its efficiency. Furthermore, designing the pump's front cover as a one-piece structure not only presents difficulties in mold design but also presents a significant problem in terms of successful demolding. Moreover, this one-piece front cover structure makes the flange fixed and unable to rotate, further increasing the difficulty of on-site assembly and hindering its practical application.

[0023] Therefore, researchers in this field are working to solve problems such as low reliability, poor structural strength, cumbersome installation procedures, and high maintenance costs of existing pump front cover assemblies in preventing leakage of transported fluids. Utility Model Content

[0024] In view of this, the present invention provides a front cover assembly and a pump, which effectively solves the problems of low reliability, poor structural strength, complicated installation procedures and high maintenance costs of existing front cover assemblies in preventing leakage of transported fluids, while also greatly improving the durability of the pump's front cover assembly and the pump's effect in preventing fluid leakage.

[0025] According to a specific embodiment of the present invention, a front cover assembly is provided, comprising:

[0026] A front cover has a fluid channel and at least one external liquid port, the at least one external liquid port being connected to the fluid channel. The at least one external liquid port of the front cover has an inner wall surface, an outer wall surface, an abutting end surface, and a receiving groove. The inner wall surface surrounds the at least one external liquid port, the outer wall surface faces away from the inner wall surface, the abutting end surface is connected to the inner wall surface and the outer wall surface, the abutting end surface is flush with the at least one external liquid port, and the receiving groove is separate from the abutting end surface.

[0027] An annular connector is installed in the receiving groove; and

[0028] The flange is movably fitted onto the annular connector relative to the front cover.

[0029] In a preferred embodiment, the annular connector is rotatably mounted in the receiving groove together with the flange.

[0030] In a preferred embodiment, the annular connector includes two arcuate portions that combine to surround the receiving groove.

[0031] In a preferred embodiment, the flange has at least one recess, the two arcuate portions have at least one protrusion, and the at least one protrusion matches the at least one recess, and the at least one protrusion of the two arcuate portions is separably located in the at least one recess of the flange.

[0032] In a preferred embodiment, the abutting end face is used to abut against the clamping member.

[0033] In a preferred embodiment, the front cover, the annular connector, and the flange are made of plastic material.

[0034] In a preferred embodiment, the plastic material includes polyphenylene sulfide, glass fiber reinforced polypropylene, carbon fiber reinforced polypropylene, carbon fiber reinforced fluoroplastic film, or polyvinylidene fluoride.

[0035] This utility model provides a pump, comprising:

[0036] The subject; and

[0037] A front cover assembly, the front cover assembly being mounted on one side of the body, the front cover assembly comprising:

[0038] A front cover has a fluid channel and at least one external liquid port, the at least one external liquid port being connected to the fluid channel. The at least one external liquid port of the front cover has an inner wall surface, an outer wall surface, an abutting end surface, and a receiving groove. The inner wall surface surrounds the at least one external liquid port, the outer wall surface faces away from the inner wall surface, the abutting end surface is connected to the inner wall surface and the outer wall surface, the abutting end surface is flush with the at least one external liquid port, and the receiving groove is separate from the abutting end surface.

[0039] An annular connector is installed in the receiving groove; and

[0040] The flange is movably fitted onto the annular connector relative to the front cover.

[0041] In a preferred embodiment, the annular connector includes two arcuate portions that combine to surround the receiving groove.

[0042] In a preferred embodiment, the flange has at least one recess, the two arcuate portions have at least one protrusion, and the at least one protrusion matches the at least one recess, and the at least one protrusion of the two arcuate portions is separably located in the at least one recess of the flange. According to the front cover assembly and pump disclosed in the above embodiments, by installing the annular connector in the receiving groove of the front cover, direct contact between the annular connector and the fluid is physically isolated. This design not only reduces the risk of corrosion or material deterioration of the annular connector, but also significantly extends the service life of the annular connector, improves the connection strength between the housing and the flange, and further reduces the probability of frequent downtime maintenance due to seal failure.

[0043] The above description of the present utility model and the following description of the embodiments are used to demonstrate and explain the principle of the present utility model, and to provide a further explanation of the scope of the patent application of the present utility model. Attached Figure Description

[0044] Figure 1 This is a perspective view of a pump according to one embodiment of the present invention.

[0045] Figure 2 for Figure 1 A three-dimensional schematic diagram of the front cover assembly.

[0046] Figure 3 for Figure 1 Exploded view of the front cover assembly.

[0047] Figure 4 for Figure 1 Front view of the front cover assembly.

[0048] Figure 5 For along Figure 4 A schematic cross-sectional view shown by section line 5-5 in the middle.

[0049] Figure 6 for Figure 1 A cross-sectional view of the connection between the front cover assembly and the pipe.

[0050] Explanation of reference numerals in the attached figures:

[0051] 10: Pump

[0052] 100: Front Cover Assembly

[0053] 110: Front Cover

[0054] 111: Fluid Channel

[0055] 112a, 112b: External liquid inlet

[0056] 1121a, 1121b: Inner wall surface

[0057] 1122a, 1122b: Outer wall surface

[0058] 1123a, 1123b: Abutting end face

[0059] 1124a, 1124b: Receiving grooves

[0060] 120a, 120b: Ring-shaped connectors

[0061] 121a, 121b: Arc-shaped portion

[0062] 122a, 122b: Protruding parts

[0063] 130a, 130b: Flanges

[0064] 131a, 131b: Depression

[0065] 200:Ontology

[0066] 300a, 300b: Pressing parts

[0067] 400a, 400b: Pipes

[0068] 430a, 430b: Flanges Detailed Implementation

[0069] The embodiments, features, and advantages of this utility model will be described in more detail below with reference to the accompanying drawings. The content is sufficient to enable anyone skilled in the art to understand the technical content of the embodiments of this utility model and to implement them accordingly. Based on the disclosure of this specification, the scope of the claims, and the drawings, anyone skilled in the art can easily understand the related objectives and advantages of this utility model. The following embodiments are further detailed in illustrating the viewpoints of this utility model, but are not intended to limit the scope of this utility model in any way.

[0070] Please see Figure 1 . Figure 1 This is a perspective view of a pump according to one embodiment of the present invention. In this embodiment, the pump 10 includes a body 200 and a front cover assembly 100. The front cover assembly 100 is mounted on one side of the body 200.

[0071] Please see Figures 2 to 5 . Figure 2 for Figure 1 A three-dimensional schematic diagram of the front cover assembly. Figure 3 for Figure 1 Exploded view of the front cover assembly. Figure 4 for Figure 1 Front view of the front cover assembly. Figure 5 For along Figure 4 A schematic cross-sectional view shown by section line 5-5 in the middle.

[0072] Please see Figure 2 In this embodiment, the front cover assembly 100 includes a front cover 110, annular connectors 120a and 120b, and flanges 130a and 130b.

[0073] Please see Figure 2 , Figure 4 and Figure 5 In this embodiment, the front cover 110 has a fluid channel 111 and two external liquid ports 112a and 112b. External liquid port 112a is connected to the fluid channel 111. External liquid port 112b is also connected to the fluid channel 111. These two external liquid ports 112a and 112b allow fluid to flow into or out of the front cover 110, respectively. Specifically, external liquid port 112a allows fluid to flow into the front cover 110, and external liquid port 112b allows fluid to flow out of the front cover 110.

[0074] In this embodiment, the front cover 110 has an inner wall surface 1121a, an outer wall surface 1122a, an abutment end surface 1123a, and a receiving groove 1124a at its external liquid inlet 112a. The inner wall surface 1121a surrounds the external liquid inlet 112a. The outer wall surface 1122a faces away from the inner wall surface 1121a. The abutment end surface 1123a is connected to both the inner wall surface 1121a and the outer wall surface 1122a and is used to abut against the mating component. The abutment end surface 1123a is flush with the external liquid inlet 112a. The receiving groove 1124a is separate from the abutment end surface 1123a. Specifically, the receiving groove 1124a is located on the outer wall surface 1122a and is not connected to the fluid channel 111. The front cover 110 has an inner wall surface 1121b, an outer wall surface 1122b, an abutment end surface 1123b, and a receiving groove 1124b at its external liquid inlet 112b. The inner wall surface 1121b surrounds the external liquid inlet 112b. The outer wall surface 1122b faces away from the inner wall surface 1121b. The abutment end surface 1123b connects to both the inner wall surface 1121b and the outer wall surface 1122b and is used to abut against mating components. The abutment end surface 1123b is flush with the external liquid inlet 112b. The receiving groove 1124b is separate from the abutment end surface 1123b. Specifically, the receiving groove 1124b is located on the outer wall surface 1122b and does not communicate with the fluid channel 111.

[0075] In this embodiment, the annular connector 120a is rotatably mounted in the receiving groove 1124a. Specifically, the annular connector 120a is located only in the receiving groove 1124a on the outer wall surface 1122a, and not on the inner wall surface 1121a, and the annular connector 120a is recessed from the abutting end face 1123a. The annular connector 120b is mounted in the receiving groove 1124b. Specifically, the annular connector 120b is located only in the receiving groove 1124b on the outer wall surface 1122b, and not on the inner wall surface 1121b, and the annular connector 120b is recessed from the abutting end face 1123b. By installing the annular connectors 120a and 120b in the receiving grooves 1124a and 1124b, direct contact between the annular connectors 120a and 120b and highly corrosive fluids such as toxic, flammable, and strong acid and alkali solutions is avoided. This effectively prevents problems such as material aging, elastic fatigue, and chemical deterioration caused by long-term contact with fluids in traditional connectors. It can not only greatly extend the service life of the connectors, but also reduce the probability of frequent downtime maintenance due to sealing failure of the connectors.

[0076] Please see Figure 3 and Figure 5 In this embodiment, the annular connector 120a may include two arc-shaped portions 121a. These two arc-shaped portions 121a combine to form a closed annular structure surrounding the receiving groove 1124a. The annular connector 120b may include two arc-shaped portions 121b. These two arc-shaped portions 121b combine to form a closed annular structure surrounding the receiving groove 1124b. Through the combined design of the annular connectors 120a and 120b, the annular connectors 120a and 120b can be easily installed in the receiving groove 1124b and can be easily disassembled when maintenance or replacement is required.

[0077] In this embodiment, there are two arc-shaped portions 121a and 121b, but this invention is not limited to this. In other embodiments, the number of arc-shaped portions may be more than two, depending on actual design requirements.

[0078] Please see Figure 2 and Figure 3 In this embodiment, the arc-shaped portion 121a may have multiple protrusions 122a. The recessed portion 131a of the flange 130a matches the protrusions 122a of the arc-shaped portion 121a, forming a structure that can engage with each other. Specifically, the protrusions 122a of the arc-shaped portion 121a are detachably located in the recessed portion 131a of the flange 130a, allowing the flange 130a to be movably fitted onto the annular connector 120a relative to the front cover 110. In other words, the protrusions 122a of the arc-shaped portion 121a can engage with the recessed portion 131a of the flange 130a, so that when the flange 130a rotates relative to the front cover 110, the annular connector 120a can rotate together with it.

[0079] Please see Figure 2 and Figure 3 In this embodiment, the arc-shaped portion 121b may have multiple protrusions 122b. The recess 131b of the flange 130b matches the protrusions 122b of the arc-shaped portion 121b, forming a structure that can engage with each other. Specifically, the protrusions 122b of the arc-shaped portion 121b are detachably located in the recess 131b of the flange 130b, allowing the flange 130b to be movably fitted onto the annular connector 120b relative to the front cover 110. In other words, the protrusions 122b of the arc-shaped portion 121b can engage with the recess 131b of the flange 130b, allowing the annular connector 120b to rotate together with the flange 130b when it rotates relative to the front cover 110.

[0080] In this embodiment, there are four protrusions 122a and 122b, but this invention is not limited thereto. In other embodiments, the number of protrusions may be less than or more than four, depending on actual design requirements.

[0081] In this embodiment, the protrusions 122a may be equally spaced in the circumferential direction of the annular connector 120a, providing a structural feature for connection with the flange 130a, but the present invention is not limited thereto. The protrusions 122b may be equally spaced in the circumferential direction of the annular connector 120b, providing a structural feature for connection with the flange 130b, but the present invention is not limited thereto. In other embodiments, the protrusions 122a and 122b may not be equally spaced in the circumferential direction of the annular connectors 120a and 120b.

[0082] In this embodiment, flanges 130a and 130b can be integrally formed, but this utility model is not limited thereto. In other words, flanges 130a and 130b can be integrally formed, but this utility model is not limited thereto.

[0083] Please see Figure 4 and Figure 5 In this embodiment, flange 130a and annular connector 120a are rotatably mounted together in receiving groove 1124a. Flange 130b and annular connector 120b are rotatably mounted together in receiving groove 1124b. Unlike the front cover assembly of a traditional pump, where the connecting parts used to simultaneously seal and stop the flanges are non-rotatable, only the flanges are rotatable, in this embodiment, the annular connectors 120a and 120b do not need to provide a sealing effect, but only need to stop flanges 130a and 130b. This design, where flanges 130a and 130b are rotatable together with annular connectors 120a and 120b, also greatly improves the convenience of on-site installation.

[0084] In this embodiment, the front cover 110, annular connectors 120a and 120b, and flanges 130a and 130b can be made of plastic materials, but this invention is not limited thereto. Plastic materials may include polyphenylene sulfide (PPS), glass fiber reinforced polypropylene (GFRPP), carbon fiber reinforced polypropylene (CFRPP), carbon fiber reinforced fluoroplastic film (CFRETFE), and polyvinylidene fluoride (PVDF), but this invention is not limited thereto. These plastic materials have excellent chemical stability and corrosion resistance, and can be exposed to various corrosive fluids for extended periods without chemical deterioration or performance degradation. In other embodiments, the front cover, annular connectors, and flanges can be made of corrosion-resistant materials such as alloys, but this invention is not limited thereto.

[0085] Please see Figure 4 and Figure 5 .like Figure 5 As shown, the design of the receiving groove 1124a allows the annular connector 120a to be securely installed in the receiving groove 1124a without contacting the fluid flowing through the fluid channel 111. The design of the receiving groove 1124b allows the annular connector 120b to be securely installed in the receiving groove 1124b without contacting the fluid flowing through the fluid channel 111. The fluid flowing through the fluid channel 111 only contacts the inner wall surfaces 1121a and 1121b and not the outer wall surfaces 1122a and 1122b. In other words, this structural design completely avoids the occurrence of fluid corrosion on the annular connectors 120a and 120b.

[0086] Please see Figure 6 . Figure 6 for Figure 1A cross-sectional view of the connection between the front cover assembly and the pipeline. In this embodiment, the external liquid inlet 112a of the front cover 110 has an inner wall surface 1121a, an outer wall surface 1122a, an abutment end surface 1123a, and a receiving groove 1124a. The inner wall surface 1121a surrounds the external liquid inlet 112a. The outer wall surface 1122a faces away from the inner wall surface 1121a. The abutment end surface 1123a is connected to the inner wall surface 1121a and the outer wall surface 1122a, and is used to abut against the clamping member 300a. In detail, when the flange 130a of the front cover assembly 100 is connected to the corresponding flange 430a of the external pipe 400a, the clamping member 300a is sandwiched between the flange 130a and the flange 430a, so that the abutting end face 1123a of the front cover 110 can fit tightly against the clamping member 300a, thereby forming good connection reliability and sealing performance, effectively preventing fluid leakage from the connection.

[0087] Please see Figure 6 The front cover 110 has an inner wall surface 1121b, an outer wall surface 1122b, an abutment end face 1123b, and a receiving groove 1124b at its external liquid inlet 112b. The inner wall surface 1121b surrounds the external liquid inlet 112b. The outer wall surface 1122b faces away from the inner wall surface 1121b. The abutment end face 1123b connects with both the inner wall surface 1121b and the outer wall surface 1122b and abuts against the clamping member 300b. Specifically, when the flange 130b of the front cover assembly 100 is connected to the corresponding flange 430b of the external pipe 400b, the clamping member 300b is sandwiched between the flange 130b and the flange 430b, so that the abutment end face 1123b of the front cover 110 can tightly fit the clamping member 300b, thereby forming a good connection reliability and sealing performance, effectively preventing fluid leakage from the connection.

[0088] According to the front cover assembly and pump of the foregoing embodiments of the present invention, by installing the annular connector in the receiving groove of the front cover, the direct contact between the annular connector and the fluid is physically isolated. This design can not only reduce the risk of corrosion or material deterioration of the annular connector, but also significantly extend the service life of the annular connector, improve the connection strength between the housing and the flange, and further reduce the probability of frequent downtime maintenance due to seal failure.

[0089] Furthermore, the flange can be movably fitted onto the annular connector relative to the front cover. The design, with its protruding arc-shaped portion matching the recessed portion of the flange, ensures a secure engagement between the annular connector and the flange, allowing for synchronous rotation and simplifying on-site installation procedures. In addition, the detachable design of the annular connector and flange allows for maintenance by simply disassembling either the annular connector or the flange, eliminating the need for destructive disassembly as required by traditional welded designs. This not only reduces maintenance costs but also improves efficiency, ensuring continuous production line operation.

[0090] Furthermore, since the front cover's abutting end face can directly abut against the clamping element, it ensures excellent connection reliability and sealing between the front cover assembly and the external pipe, effectively preventing fluid leakage from the connection.

[0091] Furthermore, the front cover, annular connectors, and flanges are all made of corrosion-resistant plastic materials, which can resist the erosion of corrosive fluids such as toxic, flammable, and strong acid and alkali solutions for a long time. Compared with traditional metal materials, they have better chemical stability, thereby improving the overall durability and reliability of the front cover assembly and pump.

[0092] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A front cover assembly, characterized in that: include: A front cover has a fluid channel and at least one external liquid port, the at least one external liquid port being connected to the fluid channel. The at least one external liquid port of the front cover has an inner wall surface, an outer wall surface, an abutting end surface, and a receiving groove. The inner wall surface surrounds the at least one external liquid port, the outer wall surface faces away from the inner wall surface, the abutting end surface is connected to the inner wall surface and the outer wall surface, the abutting end surface is flush with the at least one external liquid port, and the receiving groove is separate from the abutting end surface. An annular connector is installed in the receiving groove; as well as The flange is movably fitted onto the annular connector relative to the front cover.

2. The front cover assembly according to claim 1, characterized in that: The annular connector is rotatably mounted in the receiving groove together with the flange.

3. The front cover assembly according to claim 1, characterized in that: The annular connector includes two arcuate portions that combine to surround the receiving groove.

4. The front cover assembly according to claim 3, characterized in that: The flange has at least one recess, the two arcuate portions have at least one protrusion, and the at least one protrusion matches the at least one recess, and the at least one protrusion of the two arcuate portions is separably located in the at least one recess of the flange.

5. The front cover assembly according to claim 1, characterized in that: The abutting end face is used to abut against the clamping member.

6. The front cover assembly according to claim 1, characterized in that: The front cover, the annular connector, and the flange are made of plastic material.

7. The front cover assembly according to claim 6, characterized in that: The plastic material mentioned includes polyphenylene sulfide, glass fiber reinforced polypropylene, carbon fiber reinforced polypropylene, carbon fiber reinforced fluoroplastic film, or polyvinylidene fluoride.

8. A pump, characterized in that: include: ontology; as well as A front cover assembly, the front cover assembly being mounted on one side of the body, the front cover assembly comprising: A front cover has a fluid channel and at least one external liquid port, the at least one external liquid port being connected to the fluid channel. The at least one external liquid port of the front cover has an inner wall surface, an outer wall surface, an abutting end surface, and a receiving groove. The inner wall surface surrounds the at least one external liquid port, the outer wall surface faces away from the inner wall surface, the abutting end surface is connected to the inner wall surface and the outer wall surface, the abutting end surface is flush with the at least one external liquid port, and the receiving groove is separate from the abutting end surface. An annular connector is installed in the receiving groove; and The flange is movably fitted onto the annular connector relative to the front cover.

9. The pump of claim 8, wherein the annular connector comprises two arcuate portions that combine to surround the receiving groove.

10. The pump of claim 9, wherein the flange has at least one recess, the two arcuate portions have at least one protrusion, and the at least one protrusion matches the at least one recess, and the at least one protrusion of the two arcuate portions is separably located in the at least one recess of the flange.

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