Improved filter structure capable of rotating at high speed

By using a high-speed rotating improved filter structure, the rotating shaft drives the displacement shaft to intermittently beat the outer wall of the filter element, solving the problem of insufficient self-cleaning ability of existing filters and achieving efficient filter element cleaning and noise reduction.

CN119280947APending Publication Date: 2025-01-10ZHEJIANG BOTUOLINI MASCH CO LTD
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Patent Information

Application Number
CN202411813417.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-01-10

AI Technical Summary

Technical Problem

Existing filters have poor self-cleaning capabilities, and relying solely on centrifugal force is insufficient to effectively remove the large amount of clogging material on the filter element surface.

Method used

The filter adopts a high-speed rotating improved filter structure. The rotating shaft drives the displacement shaft to move the beater bar, which intermittently beats the outer wall of the filter element. Combined with the linkage structure of water pressure and conduction components, the filter element achieves self-cleaning.

Benefits of technology

It significantly improves the self-cleaning ability of the filter element, reduces wear on the beater rod, lowers the noise level, and improves the cleaning effect and the comfort of the working environment.

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Abstract

The invention provides a high-speed rotating improved filter structure which comprises a main machine, a driving shaft is rotationally connected to the main machine, a water inlet pipe and a sewage pipe which are communicated with the inner wall of the main machine are fixedly connected to the side wall of the main machine, and a water outlet pipe penetrating into a filter element is fixedly connected to the bottom wall of the main machine. The sum of the inner diameter of the water outlet pipe and the inner diameter of the sewage pipe is smaller than the inner diameter of the water inlet pipe, a protective plate is fixedly connected to the inner wall of the main machine, a containing cavity is formed between the protective plate and the inner wall of the main machine, a rotating shaft is rotationally connected to the inner wall of the main machine, and the driving shaft drives the rotating shaft to rotate through a linkage structure; a sliding hole is formed in the rotating shaft, a displacement shaft is slidably connected into the sliding hole, the rotating shaft rotates and enables the displacement shaft to rotate while moving through a conduction assembly, a flapping rod made of rubber is fixedly connected to the displacement shaft, and the flapping rod is used for abutting against the outer wall of the filter element, so that the purpose of improving the self-cleaning capacity is achieved.
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Description

Technical Field

[0001] The invention relates to a filter, in particular to an improved high-speed rotating filter structure. Background Art

[0002] At present, a Chinese patent with application publication number CN114470941A discloses a filter, including a filter body, the filter body having a water inlet and a clean water outlet, a filter element for filtering being arranged inside the filter body, the filter element being rotatably connected in the filter body, and a driving member for driving the filter element to rotate being arranged on the filter body; the filter element is driven to continuously rotate circumferentially by means of the driving member, so that during the filtering process, all positions on the outer surface of the filter element can rotate through the water inlet, thereby allowing all positions on the surface of the filter element to evenly achieve the filtering effect.

[0003] The rotating filter element will also generate centrifugal force on the debris adhering to the surface. The blockage on the surface of the filter element can be continuously thrown away under the centrifugal action, achieving a certain self-cleaning purpose.

[0004] However, only relying on the centrifugal force can get rid of a small amount of blockages, and a large amount of blockages are still attached to the surface of the filter element, so the self-cleaning ability is poor. Summary of the invention

[0005] In view of this, the object of the present invention is to provide an improved high-speed rotating filter structure to achieve the purpose of improving the self-cleaning ability.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a high-speed rotating improved filter structure, including a main unit, the main unit is rotatably connected to a driving shaft, the driving shaft is connected to a filter element, the driving shaft is driven by a power mechanism, the side wall of the main unit is fixedly connected to a water inlet pipe and a sewage pipe connected to the inner wall of the main unit, the bottom wall of the main unit is fixedly connected to a water outlet pipe penetrating into the filter element, the sum of the inner diameters of the water outlet pipe and the sewage pipe is smaller than the inner diameter of the water inlet pipe, the bottom wall of the main unit is provided with a sewage outlet, and the sewage outlet is provided with a filter element. A sealing plug is fixedly connected, a guard plate is fixedly connected to the inner wall of the main unit, a accommodating cavity is formed between the guard plate and the inner wall of the main unit, a rotating shaft is rotatably connected to the inner wall of the main unit, the driving shaft drives the rotating shaft to rotate through a linkage structure, a sliding hole arranged along the radial direction of the filter element is opened on the guard plate, a displacement shaft is slidably connected in the sliding hole, the rotating shaft rotates and moves the displacement shaft through a conduction component while rotating the displacement shaft, a beating rod made of rubber is fixedly connected to the displacement shaft, and the beating rod is used to contact the outer wall of the filter element.

[0007] To implement the above technical solution, sewage is injected into the main unit from the water inlet pipe. Through the action of water pressure, clean water passes through the filter element and is discharged from the water outlet pipe, and sewage that fails to pass through the filter element is discharged from the sewage pipe. During this period, the rotating shaft rotates to make the filter element filter the sewage evenly. During the rotation of the drive shaft, the rotating shaft is rotated by the linkage structure. At the same time, the rotating shaft rotates while the displacement shaft moves through the conduction component, so that the beating rod intermittently beats the outer wall of the filter element to knock a large amount of sludge off the outer wall of the filter element, thereby achieving the purpose of improving the self-cleaning ability; intermittently beating the outer wall of the filter element can reduce the wear of the beating rod and extend the service life. Intermittently beating the outer wall of the filter element can give the filter element a time to recover from deformation, making it easier to fall off the accumulated dust and sludge, thereby improving the cleaning effect; intermittent operation can reduce the noise level and improve the comfort of the working environment.

[0008] As a preferred solution of the present invention, a coaxially arranged support pipe is fixedly connected to the water outlet pipe, and a support ring for contacting with the inner wall of the filter element is fixedly connected to the outer wall of the support pipe.

[0009] To implement the above technical solution, the support tube is inserted into the filter element, and the support ring provides good support for the filter element, so that the filter element can withstand greater water pressure and improve practicality.

[0010] As a preferred solution of the present invention, a first connecting hole is provided on the side wall of the support tube, and a second connecting hole is provided on the support ring.

[0011] By implementing the above technical solution, clean water can be injected into the support pipe through the second connecting hole and the first connecting hole, and then discharged from the water outlet pipe along the support pipe, thereby improving water outlet efficiency.

[0012] As a preferred solution of the present invention, the filter element includes a fixing frame, a supporting net, and a filter net. The fixing frame is fixedly connected to the drive shaft, the supporting net is fixed on the fixing frame and is used to contact the supporting ring, and the filter net is fixed on the fixing frame and is located outside the supporting net.

[0013] To implement the above technical solution, the filter screen is supported by the support net, and the support net is supported by the support ring, so that the filter screen is not easily damaged.

[0014] As a preferred solution of the present invention, a stirring blade is fixedly connected to the outer wall of the fixing frame.

[0015] To implement the above technical solution, when the driving shaft drives the fixed frame to rotate, the stirring blades rotate along the axis of the driving shaft, so that the sludge is not easy to settle on the bottom wall of the main machine. At the same time, the sewage can be pushed to the sewage pipe to improve the efficiency of removing the sewage.

[0016] As a preferred solution of the present invention, the linkage structure includes a first connecting wheel, a second connecting wheel and a connecting belt, the first connecting wheel is fixed on the driving shaft, the second connecting wheel is fixed on the rotating shaft, and the connecting belt is tensioned by the first connecting wheel and the second connecting wheel.

[0017] To implement the above technical solution, the driving shaft rotates, the first connecting wheel rotates the second connecting wheel through the connecting belt, and the second connecting wheel rotates the rotating shaft.

[0018] As a preferred solution of the present invention, the transmission component includes a first bevel gear, a second bevel gear, a rotating shaft, and a swinging component. The first bevel gear is fixed on the rotating shaft, the second bevel gear is fixed on the rotating shaft, the rotating shaft is rotatably connected to the inner wall of the main machine, and the rotating shaft rotates and causes the displacement shaft to rotate and move through the swinging component.

[0019] To implement the above technical solution, the rotating shaft drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, and the second bevel gear drives the rotating shaft to rotate. During the rotation of the rotating shaft, the displacement shaft is rotated and moved through the swing assembly, and the first bevel gear and the second bevel gear serve the purpose of transmitting the rotating shaft and redirecting the force.

[0020] As a preferred embodiment of the present invention, the swing assembly includes a worm wheel, a worm, a first spur gear, and a second spur gear. The worm is fixed on a rotating shaft, the worm wheel is rotatably connected to the inner wall of the main machine and meshes with the worm, the first spur gear is fixed on the rotating shaft, the second spur gear is fixed on the displacement shaft and meshes with the first spur gear, and the worm wheel rotates and causes the displacement shaft to reciprocate through a connecting rod assembly.

[0021] To implement the above technical solution, the rotating shaft drives the worm to rotate, the worm drives the worm wheel to rotate, and the worm wheel causes the displacement shaft to reciprocate through the connecting rod assembly. At the same time, due to the meshing of the first spur gear and the second spur gear, the rotating shaft causes the displacement shaft to rotate during the rotation process.

[0022] As a preferred solution of the present invention, the connecting rod assembly includes a first cam, a second cam, a rocker arm, a swing gear, and a fixed ring. A plurality of the fixed rings are fixedly connected to the outer wall of the displacement shaft, and the distances between adjacent fixed rings are equal. The swing gear is rotatably connected to the inner wall of the main machine and meshes with the fixed ring. The first cam and the second cam are respectively fixed to the worm gear and the swing gear. One end of the rocker arm is rotatably connected to the first cam, and the other end of the rocker arm is rotatably connected to the second cam.

[0023] To implement the above technical solution, the rotating shaft drives the first cam to rotate, the rocker arm moves and drives the second cam to swing back and forth, the second cam drives the swing gear to swing synchronously, and the swing gear interferes with the fixed ring, so that the fixed ring drives the displacement shaft to move, and during the rotation of the displacement shaft, the fixed ring does not interfere with the swing gear.

[0024] As a preferred solution of the present invention, a pressure relief pipe is fixed on the side wall of the main machine, and the pressure relief pipe is connected to the inner wall of the main machine.

[0025] To implement the above technical solution, when the water pressure in the main unit is too high, the pressure relief pipe opens to discharge the sewage to reduce the water pressure.

[0026] In summary, the present invention has the following beneficial effects: 1. During the rotation of the drive shaft, the filter element rotates and can filter the sewage evenly; 2. During the rotation of the drive shaft, the displacement shaft moves back and forth and rotates on its own, and the beating rod intermittently beats the outer wall of the filter element, greatly improving the self-cleaning ability; 3. During the sewage filtration process, the beating rod intermittently beats the outer wall of the filter element, which can further enhance the self-cleaning ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the bottom wall structure of the host; Figure 3 A cross-sectional schematic diagram embodying the present invention; Figure 4 A schematic diagram showing the position of the stirring blade; Figure 5 To show the structural diagram of the support tube; Figure 6 To show the structural diagram of the guard plate; Figure 7 To illustrate the structural diagram of the connecting belt; Figure 8 It is a schematic diagram showing the structure of the displacement axis; Fig. 9 for Figure 8 A magnified image of point A; Fig.10 It is a structural schematic diagram showing the rotating shaft.

[0028] Figure numerals: 1, main engine; 11, driving shaft; 2, filter element; 21, fixing frame; 22, supporting net; 23, filter net; 24, stirring blade; 31, water inlet pipe; 32, sewage pipe; 33, water outlet pipe; 34, supporting pipe; 35, supporting ring; 36, first connecting hole; 37, second connecting hole; 38, pressure relief pipe; 39, sewage outlet; 391, sealing plug; 4, guard plate; 41, accommodating chamber; 42, sliding hole; 5, rotating shaft; 6, linkage joint Structure; 61. first connecting wheel; 62. second connecting wheel; 63. connecting belt; 7. displacement shaft; 71. beating rod; 8. transmission component; 81. first bevel gear; 82. second bevel gear; 83. rotating shaft; 84. swing component; 85. worm gear; 86. worm; 88. first spur gear; 89. second spur gear; 9. connecting rod assembly; 91. first cam; 92. second cam; 93. rocker rod; 94. swing gear; 95. fixing ring. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0030] A high-speed rotating improved filter structure includes a vertically placed main unit 1, on which a vertically arranged driving shaft 11 is rotatably connected. The driving shaft 11 is driven by a power mechanism (not shown in the figure), which is a servo motor fixed to the top of the main unit 1.

[0031] The drive shaft 11 is connected to a filter element 2, and the filter element 2 includes a fixed frame 21, a support net 22, and a filter screen 23. The fixed frame 21 is fixedly connected to the drive shaft 11 and is coaxially arranged. The annular support net 22 is fixed to the fixed frame 21. The filter screen 23 is fixed to the fixed frame 21 and is located outside the support net 22. The aperture of the filter hole on the filter screen 23 is 0.2mm. The filter screen 23 is made of metal. The support net 22, the filter screen 23, and the fixed frame 21 are coaxially arranged. The aperture of the filter hole is too small, so it is not shown in the figure.

[0032] A plurality of stirring blades 24 are fixedly connected to the lower surface of the fixing frame 21 , and the plurality of stirring blades 24 are evenly distributed along the axis of the fixing frame 21 .

[0033] A water inlet pipe 31 and a sewage pipe 32 communicating with the inner wall of the main unit 1 are fixedly connected to the side wall of the main unit 1, and a water outlet pipe 33 penetrating into the filter element 2 is fixedly connected to the bottom wall of the main unit 1. The sum of the inner diameters of the water outlet pipe 33 and the sewage pipe 32 is smaller than the inner diameter of the water inlet pipe 31, and the inner diameter of the sewage pipe 32 is larger than the inner diameter of the water outlet pipe 33.

[0034] The upper end of the water outlet pipe 33 is fixedly connected to a coaxially arranged support pipe 34, and a support ring 35 for contacting the inner wall of the support net 22 is fixedly connected to the outer wall of the support pipe 34. A first connection hole 36 is opened on the side wall of the support pipe 34, and a second connection hole 37 is opened on the support ring 35. The first connection hole 36 is waist-shaped, and the second connection hole 37 is circular.

[0035] A pressure relief pipe 38 is fixed on the side wall of the main unit 1 , and the pressure relief pipe 38 is communicated with the inner wall of the main unit 1 .

[0036] A sewage outlet 39 is provided on the bottom wall of the main machine 1 , and a sealing plug 391 is fixedly connected to the sewage outlet 39 . The sealing plug 391 can be removed from the sewage outlet 39 to discharge the sludge from the sewage outlet 39 .

[0037] A guard plate 4 is fixedly connected to the inner wall of the main machine 1, and a receiving chamber 41 is formed between the guard plate 4 and the inner wall of the main machine 1, so that sewage in the main machine 1 is not easy to enter the receiving chamber 41. A rotating shaft 5 is rotatably connected to the inner wall of the main machine 1, and the driving shaft 11 drives the rotating shaft 5 to rotate through the linkage structure 6.

[0038] The linkage structure 6 includes a first connecting wheel 61, a second connecting wheel 62 and a connecting belt 63. The first connecting wheel 61 is fixed on the driving shaft 11 and is coaxially arranged; the second connecting wheel 62 is fixed on the rotating shaft 5 and is coaxially arranged. The axis of the rotating shaft 5 is parallel to the axis of the driving shaft 11. The connecting belt 63 is tensioned by the first connecting wheel 61 and the second connecting wheel 62. The first connecting wheel 61 and the second belt pulley are both belt pulleys, and the connecting belt 63 is a belt.

[0039] The guard plate 4 is provided with a sliding hole 42 arranged along the radial direction of the filter element 2, and the displacement shaft 7 is slidably connected in the sliding hole 42, and an O-ring is fixedly connected between the displacement shaft 7 and the inner wall of the sliding hole 42. The rotating shaft 5 rotates and moves the displacement shaft 7 through the transmission component 8, and the displacement shaft 7 rotates at the same time.

[0040] The transmission component 8 includes a first bevel gear 81, a second bevel gear 82, a rotating shaft 83, and a swing component 84. The first bevel gear 81 is fixed on the rotating shaft 5 and is coaxially arranged, and the second bevel gear 82 is fixed on the rotating shaft 83 and is coaxially arranged. The axis of the rotating shaft 83 is parallel to the axis of the displacement shaft 7. The rotating shaft 83 is rotatably connected to the inner wall of the main machine 1, and the rotating shaft 83 rotates and causes the displacement shaft 7 to rotate and move through the swing component 84.

[0041] The swing assembly 84 includes a worm wheel 85, a worm 86, a first spur gear 88, and a second spur gear 89. The worm 86 is fixed to the rotating shaft 83 and is coaxially arranged. The worm wheel 85 is rotatably connected to the inner wall of the main machine 1 and meshes with the worm 86. The first spur gear 88 is fixed to the rotating shaft 83 and is coaxially arranged; the second spur gear 89 is fixed to the displacement shaft 7 and meshes with the first spur gear 88. The second spur gear 89 is coaxially arranged with the displacement shaft 7.

[0042] The worm gear 85 rotates and causes the displacement shaft 7 to reciprocate through the connecting rod assembly 9. The connecting rod assembly 9 includes a first cam 91, a second cam 92, a swing rod 93, a swing gear 94, and a fixing ring 95. A plurality of fixing rings 95 are fixedly connected to the outer wall of the displacement shaft 7, and the fixing rings 95 are coaxially arranged with the displacement shaft 7. The distance between two adjacent fixing rings 95 is equal.

[0043] The swing gear 94 is rotatably connected to the inner wall of the main body 1 and meshes with the fixing ring 95. The first cam 91 and the second cam 92 are respectively fixed to the worm gear 85 and the swing gear 94. One end of the swing rod 93 is rotatably connected to the first cam 91, and the other end of the swing rod 93 is rotatably connected to the second cam 92.

[0044] Accordingly, during the rotation of the rotating shaft 5, the first bevel gear 81 drives the second bevel gear 82 to rotate, the second bevel gear 82 drives the rotating shaft 83, and drives the second spur gear 89 to rotate through the first spur gear 88, and the second spur gear 89 drives the displacement shaft 7 to rotate. At the same time, the rotating shaft 83 drives the worm 86 to rotate, and the worm 86 drives the worm wheel 85 to rotate. The worm wheel 85 drives the first cam 91 to rotate, and the first cam 91 drives the swing rod 93 to move, so that the swing rod 93 drives the second cam 92 to swing back and forth, and the second cam 92 drives the swing gear 94 to swing, and the swing gear 94 is in low contact with the fixing ring 95, so that the fixing ring 95 drives the displacement shaft 7 to move along the axis of the displacement shaft 7.

[0045] Thereby, the displacement shaft 7 is moved and rotated at the same time.

[0046] A rubber-made beating rod 71 is fixedly connected to the end of the displacement shaft 7 , and the beating rod 71 is located outside the accommodating cavity 41 . The beating rod 71 is used to abut against the outer wall of the filter element 2 .

[0047] In order to discharge the sewage in the accommodating chamber 41 , a through hole (not shown in the figure) is opened on the outer wall of the main unit 1 , and the through hole is connected with the accommodating chamber 41 . The through hole is located below the level of the sliding hole 42 .

[0048] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A high-speed rotating improved filter structure, comprising a main unit (1), the main unit (1) being rotatably connected to a driving shaft (11), the driving shaft (11) being connected to a filter element (2), the driving shaft (11) being driven by a power mechanism, the side wall of the main unit (1) being fixedly connected to a water inlet pipe (31) and a sewage pipe (32) communicating with the inner wall of the main unit (1), the bottom wall of the main unit (1) being fixedly connected to a water outlet pipe (33) penetrating into the interior of the filter element (2), the sum of the inner diameters of the water outlet pipe (33) and the sewage pipe (32) being smaller than the inner diameter of the water inlet pipe (31), the bottom wall of the main unit (1) being provided with a sewage outlet (39), the sewage outlet (39) being fixedly connected to a sealing plug (391), wherein: A guard plate (4) is fixedly connected to the inner wall of the main unit (1), and a receiving chamber (41) is formed between the guard plate (4) and the inner wall of the main unit (1). A rotating shaft (5) is rotatably connected to the inner wall of the main unit (1), and the driving shaft (11) drives the rotating shaft (5) to rotate through a linkage structure (6). A sliding hole (42) arranged along the radial direction of the filter element (2) is opened on the guard plate (4), and a displacement shaft (7) is slidably connected in the sliding hole (42). The rotating shaft (5) rotates and moves the displacement shaft (7) through a transmission component (8), and the displacement shaft (7) rotates at the same time. A beating rod (71) made of rubber is fixedly connected to the displacement shaft (7), and the beating rod (71) is used to contact the outer wall of the filter element (2).

2. The high-speed rotating improved filter structure according to claim 1 is characterized in that: The water outlet pipe (33) is fixedly connected to a coaxially arranged support pipe (34), and the outer wall of the support pipe (34) is fixedly connected to a support ring (35) for contacting the inner wall of the filter element (2).

3. The high-speed rotating improved filter structure according to claim 2 is characterized in that: A first connection hole (36) is provided on the side wall of the support tube (34), and a second connection hole (37) is provided on the support ring (35).

4. The high-speed rotating improved filter structure according to claim 3 is characterized in that: The filter element (2) comprises a fixing frame (21), a supporting net (22), and a filter net (23); the fixing frame (21) is fixedly connected to the driving shaft (11); the supporting net (22) is fixed to the fixing frame (21) and is used to contact the supporting ring (35); and the filter net (23) is fixed to the fixing frame (21) and is located outside the supporting net (22).

5. The high-speed rotating improved filter structure according to claim 4 is characterized in that: A stirring blade (24) is fixedly connected to the outer wall of the fixing frame (21).

6. The high-speed rotating improved filter structure according to claim 4 is characterized in that: The linkage structure (6) comprises a first connecting wheel (61), a second connecting wheel (62) and a connecting belt (63); the first connecting wheel (61) is fixed on the driving shaft (11); the second connecting wheel (62) is fixed on the rotating shaft (5); and the connecting belt (63) is tensioned by the first connecting wheel (61) and the second connecting wheel (62).

7. A high-speed rotating improved filter structure according to claim 6, characterized in that: The transmission component (8) comprises a first bevel gear (81), a second bevel gear (82), a rotating shaft (83), and a swing component (84); the first bevel gear (81) is fixed on the rotating shaft (5); the second bevel gear (82) is fixed on the rotating shaft (83); the rotating shaft (83) is rotatably connected to the inner wall of the main machine (1); the rotating shaft (83) rotates and causes the displacement shaft (7) to rotate and move through the swing component (84).

8. The high-speed rotating improved filter structure according to claim 7 is characterized in that: The swing assembly (84) comprises a worm wheel (85), a worm (86), a first spur gear (88), and a second spur gear (89); the worm (86) is fixed on the rotating shaft (83); the worm wheel (85) is rotatably connected to the inner wall of the main machine (1) and meshes with the worm (86); the first spur gear (88) is fixed on the rotating shaft (83); the second spur gear (89) is fixed on the displacement shaft (7) and meshes with the first spur gear (88); the worm wheel (85) rotates and causes the displacement shaft (7) to reciprocate through the connecting rod assembly (9).

9. The high-speed rotating improved filter structure according to claim 8 is characterized in that: The connecting rod assembly (9) comprises a first cam (91), a second cam (92), a swing rod (93), a swing gear (94), and a fixed ring (95). A plurality of the fixed rings (95) are fixedly connected to the outer wall of the displacement shaft (7), and the distances between adjacent fixed rings (95) are equal. The swing gear (94) is rotatably connected to the inner wall of the main machine (1) and meshes with the fixed ring (95). The first cam (91) and the second cam (92) are respectively fixed to the worm gear (85) and the swing gear (94). One end of the swing rod (93) is rotatably connected to the first cam (91), and the other end of the swing rod (93) is rotatably connected to the second cam (92).

10. The high-speed rotating improved filter structure according to claim 1 is characterized in that: A pressure relief pipe (38) is fixed on the side wall of the main machine (1), and the pressure relief pipe (38) is connected to the inner wall of the main machine (1).

Citation Information

Patent Citations

  • Filter

    CN114470941A

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    CN116533799A

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    CN217139512U