Filtering mechanism and booster pump

Abstract

The utility model relates to the technical field of filtering, in particular to a filtering mechanism and a booster pump, which comprise a filtering assembly, a structural part, a sealing part arranged on the inner side of the structural part, a driving part arranged on the inner side of the structural part and a cleaning part arranged on one side of the structural part, the mounting cylinder is fixedly arranged on the inner side of the water inlet of the shell, the structural part further comprises a conical filter cylinder and a cylindrical filter cylinder, and the conical filter cylinder is fixedly arranged on the inner side of the water outlet of the shell. The centrifugal pump has the advantages that when water flow impacts the pump body, the pair of single-row angular contact ball bearings additionally arranged at the free end serve as thrust bearings and are installed in a back-to-back mode, it is guaranteed that radial bearings are free of interference, residual axial thrust is absorbed, rotation of the fan can dissipate heat for the bearing chamber, and the service life of the centrifugal pump is prolonged. The radiating plates designed on the upper and lower parts of the bearing chamber can increase the radiating area of the bearing chamber and reduce the temperature of the bearing chamber.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration, in particular to a filtration mechanism and a pre-pump. Background Art

[0002] In the feed water system of the steam turbine, in order to ensure the water pressure of the feed water pump and prevent cavitation of the feed water pump, a pre-pump is usually equipped. The main function of the pre-pump is to serve as a booster pump for the feed water pump, ensuring the inlet pressure required by the feed water pump and having sufficient cavitation margin to prevent the feed water pump from vaporizing during operation.

[0003] The feed water pressure of the steam turbine is high, and in the bearing chamber of the existing pre-pump, the bearing rotating shaft is often subjected to residual axial thrust, which leads to displacement of the rotating shaft. Such pre-pumps are usually equipped with filtering devices, while the existing filtering devices are relatively simple and easily corroded and damaged. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the technical problems in the above-mentioned prior art that the bearing rotating shaft is often subjected to residual axial thrust, which causes the rotating shaft to shift and the filtering device is relatively simple and easily corroded and damaged, the present utility model is proposed.

[0006] The utility model aims to provide a filtering mechanism, which aims to solve the problem that the existing filtering device is relatively simple and easily corroded and damaged.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a filtering mechanism, which includes a filtering assembly, including a structural member, a sealing member arranged on the inner side of the structural member, a driving member arranged on the inner side of the structural member, and a cleaning member arranged on one side of the structural member; the structural member includes a shell and an installation cylinder, the shell is divided into a water outlet and a water inlet, and the installation cylinder is fixedly arranged on the inner side of the water inlet of the shell.

[0008] As a preferred solution of the filtering mechanism of the utility model, the structural member further comprises a conical filter cartridge and a cylindrical filter cartridge, the conical filter cartridge is fixedly arranged on the inner side of the water outlet of the shell, and the cylindrical filter cartridge is fixedly arranged on the end surface of the mounting cylinder.

[0009] As a preferred solution of the filtering mechanism of the utility model, the sealing member includes a rubber ring and a support frame, the rubber ring is sleeved on the outside of the mounting tube, the support frame is fixedly arranged on the side of the rubber ring, the rubber ring is slidably arranged on the inner side of the shell, the side of the mounting tube is provided with an arc surface, and the rubber ring is located on one side of the arc surface of the mounting tube.

[0010] As a preferred solution of the filtering mechanism of the utility model, the driving member includes a bracket, a central shaft, a turbine and a torsion plate, the bracket is fixedly arranged on the inner side of the mounting cylinder, the central shaft is rotatably arranged on the inner side of the bracket, the turbine is fixedly arranged on the end of the central shaft, the torsion plate is fixedly arranged on the side of the central shaft, and the torsion plate is slidably arranged on the inner side of the conical filter cylinder.

[0011] As a preferred solution of the filtering mechanism of the utility model, the driving member further comprises a fixed plate, a circular ring frame, a force plate, an ear plate, a semicircular rod and an arc spring, the fixed plate is fixedly arranged on the side of the central axis, the fixed plate is located outside the conical filter cartridge, the force plate is slidably arranged on the side of the conical filter cartridge, the circular ring frame and the central axis are coaxially arranged, and the force plate is fixedly arranged on the end face of the circular ring frame.

[0012] As a preferred solution of the filtering mechanism of the utility model, the ear plate is fixedly arranged on the inner side of the circular ring frame, the semicircular rod is fixedly arranged on the side of the fixed plate, the side of the ear plate is provided with a through hole, the semicircular rod is slidably arranged on the inner side of the ear plate through hole, and the two ends of the arc spring are respectively fixedly arranged on the sides of the ear plate and the fixed plate.

[0013] As a preferred solution of the filtering mechanism of the utility model, the cleaning member includes a rotating frame, bristles, a side plate and a concave hole, the rotating frame is rotatably set on the side of the central axis, the bristles are fixedly set on the side of the rotating frame, the side plate is fixedly set on the side of the rotating frame away from the bristles, and the concave hole is opened on the side of the side plate.

[0014] As a preferred solution of the filtering mechanism of the utility model, the cleaning member further comprises a rotating plate, a rotating rod, a sponge plate, a cylindrical barrel, a side rod and a circular hole, wherein the rotating plate is fixedly arranged on the side of the central axis, the rotating rod is rotatably arranged on the side of the rotating plate, the sponge plate is fixedly arranged on the side of the rotating rod, the cylindrical barrel is sleeved on the side of the rotating rod, the side rod is fixedly arranged on the side of the cylindrical barrel, the circular hole is opened on the inner side of the cylindrical filter barrel, and the side rod abuts against the circular hole when the cylindrical barrel rotates.

[0015] The beneficial effect of the filtering mechanism of the utility model is that due to the presence of the arc spring, when the fixed plate is driven away from the ear plate by the central axis, the internal elastic force of the arc spring becomes larger, which will drive the circular ring frame to bounce, so that due to the slight vibration of the force-bearing plate, the water flow around the force-bearing plate is aroused during the vibration process, reducing the possibility of impurities sticking to the surface of the conical filter cartridge, thereby avoiding the conical filter cartridge from being corroded.

[0016] Another object of the utility model is to provide a pre-pump, which aims to provide a pair of single-row angular contact ball bearings installed at the free end as thrust bearings, so as to solve the problem that the rotating shaft of the bearing is often subjected to residual axial thrust.

[0017] In order to solve the above technical problems, the utility model also provides the following technical solutions: a pre-pump, which includes a filtering mechanism; and a bearing assembly, including a pump body, a protective shell, a bearing chamber, a fan, a heat sink, a bearing rod and a single-row angular contact ball bearing, the protective shell is sleeved on the end of the pump body, the bearing chamber is located inside the protective shell and fixedly arranged at the end of the pump body, the fan is rotatably arranged on the side of the bearing chamber, the heat sink is fixedly arranged on the outside of the bearing chamber, and the bearing rod is rotatably arranged on the inner side of the pump body and the bearing chamber.

[0018] As a preferred solution of the pre-pump of the utility model, the bearing rod has a free end and a transmission end, the transmission end is rotatably arranged on the inner side of the shell, and the single-row angular contact ball bearing is sleeved on the free end of the bearing rod.

[0019] The beneficial effects of the front pump of the utility model are as follows: when the water flow impacts the pump body, a pair of single-row angular contact ball bearings installed at the free end are used as thrust bearings, which are installed back to back to ensure that there is no interference between the radial bearings and absorb the residual axial thrust, while the rotation of the fan can dissipate heat for the bearing chamber, and the heat dissipation plates designed on the upper and lower parts of the bearing chamber can increase the heat dissipation area of ​​the bearing chamber and reduce the temperature of the bearing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the overall structure of the pre-pump in the utility model.

[0022] Figure 2 It is a schematic diagram of the internal structure of the shell in the utility model.

[0023] Figure 3It is a schematic diagram of the overall structure of the filtering mechanism in the utility model.

[0024] Figure 4 It is a schematic diagram of the internal structure of the conical filter cartridge in the utility model.

[0025] Figure 5 It is a schematic diagram of the circular ring frame structure in the utility model.

[0026] Figure 6 This is a schematic diagram of the cleaning component structure of the present utility model.

[0027] Figure 7 It is a schematic diagram of the side rod structure in the utility model.

[0028] Figure 8 It is a schematic diagram of the internal structure of the bearing chamber in the utility model. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1, reference Figure 1 to Figure 5 , which is the first embodiment of the utility model, and provides a filtering mechanism, including a filtering assembly 100, including a structural member 101, a sealing member 102 arranged inside the structural member 101, a driving member 103 arranged inside the structural member 101, and a cleaning member 104 arranged on one side of the structural member 101.

[0033] Furthermore, the structural component 101 includes a shell 101a and a mounting cylinder 101b. The shell 101a is divided into a water outlet and a water inlet. The mounting cylinder 101b is fixedly arranged on the inner side of the water inlet of the shell 101a. The structural component 101 also includes a conical filter cartridge 101c and a cylindrical filter cartridge 101d. The conical filter cartridge 101c is fixedly arranged on the inner side of the water outlet of the shell 101a. The conical filter cartridge 101c is conical in shape as a whole, and has many filter holes on its side for filtering larger particles of impurities. The cylindrical filter cartridge 101d is fixedly arranged on the end face of the mounting cylinder 101b. The cylindrical filter cartridge 101d is cylindrical in shape as a whole, and has many filter holes on its side, and the filter holes are smaller than those of the conical filter cartridge 101c, so as to perform secondary filtration on the water flow.

[0034] Preferably, the sealing member 102 comprises a rubber ring 102a and a support frame 102b, the rubber ring 102a is sleeved on the outside of the mounting tube 101b, the support frame 102b is fixedly arranged on the side of the rubber ring 102a, the rubber ring 102a is slidably arranged on the inner side of the shell 101a, the side of the mounting tube 101b is provided with an arc surface, the rubber ring 102a is located on one side of the arc surface of the mounting tube 101b, three rubber rings 102a are provided, two support frames 102b are provided, the support frames 102b are located on both sides of the middle rubber ring 102a and are respectively connected to the other two rubber rings 102a, and the support frames 102b are metal parts, which increase the rigidity of the rubber ring 102a.

[0035] When the rubber ring 102a is subjected to the pressure of the water flow, it will slowly move, and the support frame 102b can transfer the pressure of the outermost rubber ring 102a to the innermost side. After the innermost rubber ring 102a is subjected to the pressure, it begins to move toward the arc surface of the mounting tube 101b. As the diameter of the arc surface increases, the rubber ring 102a is stretched open, and its squeezing force on the mounting tube 101b and the housing 101a also increases, thereby increasing the sealing performance. That is, with the impact of the water flow, the sealing performance of the seal 102 gradually increases.

[0036] The driving member 103 includes a bracket 103a, a central shaft 103b, a turbine 103c and a torsion plate 103d. The bracket 103a is fixedly arranged on the inner side of the mounting tube 101b, the central shaft 103b is rotatably arranged on the inner side of the bracket 103a, and the turbine 103c is fixedly arranged on the end of the central shaft 103b. The turbine 103c is located at one end of the central shaft 103b away from the mounting tube 101b. When the water flow impacts, it can directly impact the surface of the turbine 103c, so that the turbine 103c Rotate, the twist plate 103d is fixedly set on the side of the central axis 103b, and the twist plate 103d is slidably set on the inner side of the conical filter cartridge 101c. The side of the twist plate 103d is a curved surface. When the twist plate 103d rotates along with the central axis 103b, the water flow inside the conical filter cartridge 101c is squeezed out of the filter hole by the twist plate 103d, and the outer surface of the twist plate 103d can scratch the inner surface of the conical filter cartridge 101c, so as to prevent the sticky impurities in the water from adhering to the inner surface of the conical filter cartridge 101c.

[0037] The driving member 103 also includes a fixed plate 103e, a circular frame 103f, a force plate 103g, an ear plate 103h, a semicircular rod 103i and an arc spring 103j. The fixed plate 103e is fixedly arranged on the side of the central axis 103b, the fixed plate 103e is located outside the conical filter cartridge 101c, the force plate 103g is slidably arranged on the side of the conical filter cartridge 101c, the circular frame 103f and the central axis 103b are coaxially arranged, the force plate 103g is fixedly arranged on the end face of the circular frame 103f, the ear plate 103h is fixedly arranged on the inner side of the circular frame 103f, the semicircular rod 103i is fixedly arranged on the side of the fixed plate 103e, a through hole is opened on the side of the ear plate 103h, the semicircular rod 103i is slidably arranged on the inner side of the through hole of the ear plate 103h, and the two ends of the arc spring 103j are respectively fixedly arranged on the sides of the ear plate 103h and the fixed plate 103e.

[0038] Usage process: After the pre-pump is turned on, water flows into the shell 101a from the water inlet and impacts the turbine 103c. After being impacted by the water flow, the turbine 103c starts to rotate and drives the torsion plate 103d to rotate. The torsion plate 103d squeezes the water in the conical filter cartridge 101c out of the filter hole, thereby accelerating the water flow that has lost speed due to the obstruction of the turbine 103c again. This part of the water flow squeezed out of the filter hole hits the surface of the force plate 103g, causing the force plate 103g to rotate. After the force plate 103g rotates, the torsional force is applied to the central axis 103b through the arc spring 103j, so that the central axis 103b obtains auxiliary acceleration.

[0039] In addition, due to the presence of the arc spring 103j, when the fixed plate 103e is driven by the central axis 103b away from the ear plate 103h, the internal elastic force of the arc spring 103j becomes larger, which will drive the circular ring frame 103f to bounce, so that due to the slight oscillation of the force-bearing plate 103g, the water flow around the force-bearing plate 103g is aroused during the oscillation process, reducing the possibility of impurities sticking to the surface of the conical filter cartridge 101c, thereby avoiding the conical filter cartridge 101c from being corroded.

[0040] Example 2, reference Figure 6-7 , which is the second embodiment of the utility model. Different from the previous embodiment, the cleaning member 104 includes a rotating frame 104a, bristles 104b, a side plate 104c and a concave hole 104d. The rotating frame 104a is rotatably arranged on the side of the central axis 103b, the bristles 104b are fixedly arranged on the side of the rotating frame 104a, the side plate 104c is fixedly arranged on the side of the rotating frame 104a away from the bristles 104b, and the concave hole 104d is opened on the side of the side plate 104c. The cleaning member 104 also includes a rotating plate 104e, a rotating rod 104f, a sponge Plate 104g, cylindrical tube 104h, side rod 104i and circular hole 104j, the rotating plate 104e is fixedly set on the side of the central axis 103b, the rotating rod 104f is rotatably set on the side of the rotating plate 104e, the sponge plate 104g is fixedly set on the side of the rotating rod 104f, the cylindrical tube 104h is sleeved on the side of the rotating rod 104f, the side rod 104i is fixedly set on the side of the cylindrical tube 104h, the circular hole 104j is opened on the inner side of the cylindrical filter tube, and the side rod 104i abuts against the circular hole 104j when the cylindrical tube 104h rotates.

[0041] Usage process: After the central axis 103b rotates, it drives the rotating frame 104a to rotate. When the rotating frame 104a rotates, the bristles 104b clean the surface of the cylindrical filter cartridge to prevent impurities from adhering to the surface of the cylindrical filter cartridge, thereby avoiding corrosion. When the side plate 104c rotates around the central axis 103b in the water, the concave hole 104d can excite the turbine 103c, further exciting the water flow on the surface of the cylindrical filter cartridge, thereby preventing impurities from corroding the surface of the cylindrical filter cartridge.

[0042] On the inner side of the cylindrical filter cartridge, the central axis 103b drives the rotating rod 104f to rotate. During rotation, the side rod 104i abuts against the circular hole 104j, thereby driving the rotating rod 104f to rotate through the cylindrical cartridge 104h, thereby realizing the rotation of the sponge plate 104g. When the sponge plate 104g rotates, it cleans the inner surface of the cylindrical filter cartridge and absorbs some fine impurities, thereby achieving the purpose of cleaning the inside of the cylindrical filter cartridge and preventing corrosion inside the cylindrical filter cartridge.

[0043] Example 3, reference Figures 1 to 8, which is the third embodiment of the utility model, and this embodiment further provides a pre-pump. It includes a filtering mechanism; and a bearing assembly 200, including a pump body 201, a protective shell 202, a bearing chamber 203, a fan 204, a heat sink 205, a bearing rod 206 and a single-row angular contact ball bearing 207. The protective shell 202 is sleeved at the end of the pump body 201, the bearing chamber 203 is located inside the protective shell 202 and fixedly arranged at the end of the pump body 201, the fan 204 is rotatably arranged on the side of the bearing chamber 203, the heat sink 205 is fixedly arranged on the outside of the bearing chamber 203, the bearing rod 206 is rotatably arranged on the inside of the pump body 201 and the bearing chamber 203, the bearing rod 206 is divided into a free end and a transmission end, the transmission end is rotatably arranged on the inside of the housing 101a, and the single-row angular contact ball bearing 207 is sleeved on the free end of the bearing rod 206.

[0044] Usage process: When the water flow impacts the pump body 201, a pair of single-row angular contact ball bearings 207 installed at the free end are used as thrust bearings, which are installed back to back to ensure that there is no interference between the radial bearings and absorb the residual axial thrust. The rotation of the fan 204 can dissipate heat for the bearing chamber 203. The heat sink 205 designed on the upper and lower parts of the bearing chamber 203 can increase the heat dissipation area of ​​the bearing chamber 203 and reduce the temperature of the bearing chamber 203.

[0045] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0046] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0047] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A filtering mechanism, characterized in that: include, A filter assembly (100) comprises a structural member (101), a sealing member (102) arranged inside the structural member (101), a driving member (103) arranged inside the structural member (101), and a cleaning member (104) arranged on one side of the structural member (101); The structural member (101) comprises a shell (101a) and a mounting tube (101b); the shell (101a) is divided into a water outlet and a water inlet; the mounting tube (101b) is fixedly arranged on the inner side of the water inlet of the shell (101a).

2. The filtering mechanism according to claim 1, characterized in that: The structural member (101) further comprises a conical filter cartridge (101c) and a columnar filter cartridge (101d), wherein the conical filter cartridge (101c) is fixedly arranged on the inner side of the water outlet of the housing (101a), and the columnar filter cartridge (101d) is fixedly arranged on the end surface of the mounting cylinder (101b).

3. The filter mechanism according to claim 2, characterized in that: The sealing element (102) comprises a rubber ring (102a) and a support frame (102b); the rubber ring (102a) is sleeved on the outside of the mounting tube (101b); the support frame (102b) is fixedly arranged on the side of the rubber ring (102a); the rubber ring (102a) is slidably arranged on the inside of the housing (101a); the side of the mounting tube (101b) is provided with an arc surface; and the rubber ring (102a) is located on one side of the arc surface of the mounting tube (101b).

4. The filtering mechanism according to claim 3, characterized in that: The driving member (103) comprises a bracket (103a), a central shaft (103b), a turbine (103c) and a torsion plate (103d); the bracket (103a) is fixedly arranged on the inner side of the mounting cylinder (101b); the central shaft (103b) is rotatably arranged on the inner side of the bracket (103a); the turbine (103c) is fixedly arranged on the end of the central shaft (103b); the torsion plate (103d) is fixedly arranged on the side of the central shaft (103b); and the torsion plate (103d) is slidably arranged on the inner side of the conical filter cylinder (101c).

5. The filtering mechanism according to claim 4, characterized in that: The driving member (103) further comprises a fixing plate (103e), a circular ring frame (103f), a force-bearing plate (103g), an ear plate (103h), a semicircular rod (103i) and an arc spring (103j); the fixing plate (103e) is fixedly arranged on the side of the central axis (103b); the fixing plate (103e) is located outside the conical filter cartridge (101c); the force-bearing plate (103g) is slidably arranged on the side of the conical filter cartridge (101c); the circular ring frame (103f) and the central axis (103b) are coaxially arranged; and the force-bearing plate (103g) is fixedly arranged on the end face of the circular ring frame (103f).

6. The filtering mechanism according to claim 5, characterized in that: The ear plate (103h) is fixedly arranged on the inner side of the circular frame (103f), the semicircular rod (103i) is fixedly arranged on the side of the fixed plate (103e), a through hole is opened on the side of the ear plate (103h), the semicircular rod (103i) is slidably arranged on the inner side of the through hole of the ear plate (103h), and the two ends of the arc spring (103j) are respectively fixedly arranged on the sides of the ear plate (103h) and the fixed plate (103e).

7. The filter mechanism according to claim 6, characterized in that: The cleaning member (104) comprises a rotating frame (104a), bristles (104b), a side plate (104c) and a concave hole (104d); the rotating frame (104a) is rotatably arranged on the side of the central axis (103b); the bristles (104b) are fixedly arranged on the side of the rotating frame (104a); the side plate (104c) is fixedly arranged on the side of the rotating frame (104a) away from the bristles (104b); and the concave hole (104d) is opened on the side of the side plate (104c).

8. The filter mechanism according to claim 7, characterized in that: The cleaning member (104) further comprises a rotating plate (104e), a rotating rod (104f), a sponge plate (104g), a cylindrical tube (104h), a side rod (104i) and a circular hole (104j); the rotating plate (104e) is fixedly arranged on the side of the central axis (103b); the rotating rod (104f) is rotatably arranged on the side of the rotating plate (104e); the sponge plate (104g) is fixedly arranged on the side of the rotating rod (104f); the cylindrical tube (104h) is sleeved on the side of the rotating rod (104f); the side rod (104i) is fixedly arranged on the side of the cylindrical tube (104h); the circular hole (104j) is opened on the inner side of the cylindrical filter tube; and the side rod (104i) abuts against the circular hole (104j) when the cylindrical tube (104h) rotates.

9. A pre-pump, characterized in that: It comprises the filtering mechanism described in any one of claims 1 to 8; and a bearing assembly (200), comprising a pump body (201), a protective shell (202), a bearing chamber (203), a fan (204), a heat sink (205), a bearing rod (206) and a single-row angular contact ball bearing (207), wherein the protective shell (202) is sleeved on the end of the pump body (201), the bearing chamber (203) is located inside the protective shell (202) and fixedly arranged at the end of the pump body (201), the fan (204) is rotatably arranged on the side of the bearing chamber (203), the heat sink (205) is fixedly arranged on the outside of the bearing chamber (203), and the bearing rod (206) is rotatably arranged on the inner side of the pump body (201) and the bearing chamber (203).

10. The pre-pump according to claim 9, characterized in that: The bearing rod (206) is divided into a free end and a transmission end. The transmission end is rotatably arranged on the inner side of the housing (101a). The single-row angular contact ball bearing (207) is sleeved on the free end of the bearing rod (206).

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