Duplex filter

Abstract

The utility model provides a duplex filter. The duplex filter comprises two filtering tanks and two three-way ball valves, the two three-way ball valves are arranged between the two filtering tanks up and down. And two openings of each three-way ball valve are respectively communicated with the corresponding filtering tanks. And a partition plate is arranged in the filtering tank. And the filter tank is divided into an upper feeding cavity and a lower discharging cavity by the partition plate. More than one mounting hole is formed in the partition plate; and a vertically arranged filter bag is arranged in the mounting hole. The duplex filter further comprises a control mechanism, the filter bag can be vertically folded, the end, close to the partition plate, of the filter bag is folded, and the end, away from the partition plate, of the filter bag is stretched. And the control mechanism is used for controlling the part of the filter bag in the folded state to stretch downwards. Under the driving of the control mechanism, through the foldable arrangement of the filter bag, the replacement time interval of the filter bag can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of food processing equipment, in particular to a double filter. Background Art

[0002] In juice processing, a double filter is needed to filter the juice to remove pomace and particulate matter, making the juice purer and tasting better.

[0003] In practice, it is found that the filter bags of the duplex filter need to be replaced frequently, which is inconvenient. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a duplex filter, which can solve or at least alleviate one or more of the above-mentioned problems and other problems in the prior art.

[0005] The utility model provides a double filter, comprising two filter tanks and two three-way ball valves; the two three-way ball valves are arranged up and down between the two filter tanks; the two openings of each three-way ball valve are respectively connected to the corresponding filter tanks; a partition is provided in the filter tank; the partition separates the filter tank into an upper feed chamber and a lower discharge chamber; one or more mounting holes are provided on the partition; a vertically arranged filter capsule is provided in the mounting hole, and the capsule body of the filter capsule is located in the discharge chamber; it is characterized in that it also includes a control mechanism; the filter capsule can be vertically folded; the filter capsule is folded at one end close to the partition, and the filter capsule is stretched at one end away from the partition; the control mechanism is used to control the partial filter capsule in the folded state to stretch downward.

[0006] Preferably, the filter capsule comprises:

[0007] A plurality of connecting rings are coaxially arranged vertically;

[0008] a plurality of cylindrical filter screens, wherein two adjacent connecting rings at both ends of each cylindrical filter screen are coaxially connected; and

[0009] A circular bottom net connected to the inner wall of the lowest connecting ring among the plurality of connecting rings;

[0010] The uppermost connecting ring among the plurality of connecting rings is arranged in the mounting hole.

[0011] Preferably, the cylindrical filter screen comprises:

[0012] a first conical cylindrical portion having a large diameter end and a small diameter end, wherein the large diameter end of the first conical cylindrical portion is connected to the inner wall of the corresponding connecting ring; and

[0013] The second conical cylinder portion has a large diameter end and a small diameter end. The small diameter end of the second conical cylinder portion is connected to the small diameter end of the first conical cylinder portion, and the large diameter end of the second conical cylinder portion is connected to the inner wall of the corresponding connecting ring.

[0014] Preferably, the control mechanism includes:

[0015] a first mounting ring, pressed against the opening of the mounting hole and connectable to the partition;

[0016] A plurality of vertically arranged guide rods, the upper ends of which pass through the mounting holes and are connected to the lower ends of the mounting rings; and

[0017] a second mounting ring connected to one end of the plurality of guide rods away from the first mounting ring;

[0018] A guide hole is provided on the connecting ring corresponding to each guide rod; the guide hole and the corresponding guide rod are vertically slidably matched; the uppermost connecting ring among the multiple connecting rings and the mounting ring are connected by setting a cylindrical filter screen.

[0019] Preferably, the control mechanism further comprises:

[0020] a mounting sleeve arranged vertically, with its lower end inserted into the filter capsule and its upper end connected to the first mounting ring;

[0021] Two sliding rings are vertically slidably sleeved outside the mounting sleeve and are respectively connected to the inner walls of the corresponding connecting rings;

[0022] A first driving rod, the lower end of which passes through the mounting sleeve and is dynamically sealed with the inner wall of the mounting sleeve and is rotatable; and

[0023] a blocking assembly, capable of abutting against the lower end of the sliding ring and connected to the lower end of the first driving rod;

[0024] A clearance gap is provided on the inner ring of the sliding ring; the clearance gap allows the blocking component to pass through, and the clearance gaps on the two sliding rings are staggered.

[0025] Preferably, the blocking assembly comprises:

[0026] A matching ring is rotatably sleeved on the first driving rod;

[0027] A first blocking block is connected to the outer wall of the mating ring, with both sides of its upper end surface transitioning to the arcuate surfaces of the two side surfaces, and its upper end surface can abut against the lower end of the sliding ring;

[0028] a first limiting block connected to the lower end of the first blocking block;

[0029] a connecting block connected to the outer wall of the first driving rod;

[0030] a second blocking block, the lower end of which is connected to the connecting block and is located on one side of the first blocking block; and

[0031] a second limiting block, the lower end of which is connected to the connecting block;

[0032] The first limit block is located between the second limit block and the second blocking block; the upper end of the first blocking block and the upper end of the second blocking block can pass through the clearance gap when they approach each other; when the second blocking block moves away from the first blocking block, the rotation of the first driving rod can drive the sliding ring located under the second blocking block to move along its axial direction.

[0033] Preferably, the control mechanism also includes a second drive rod and a transition rod; the second drive rod is coaxially connected to the lower end of the first drive rod; the transition rod is coaxially connected to the lower end of the second drive rod; the second drive rod can be threadedly connected to the inner wall of the sliding ring; the transition rod can slide in conjunction with the inner wall of the sliding ring.

[0034] Preferably, the filter tank includes an openable and closable top cover;

[0035] The control mechanism further comprises:

[0036] a square rod connected to the upper end of the first driving rod; and

[0037] A motor is provided on the top cover, and an output end thereof is connected to a square sleeve;

[0038] The square sleeve can be sleeved outside the corresponding square rod.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] In the technology of the utility model, under the drive of the control mechanism, the filter capsule is foldable, so that the replacement time interval of the filter capsule can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0042] Figure 1 This is a three-dimensional diagram of a duplex filter in one embodiment of the present invention;

[0043] Figure 2 for Figure 1 A three-dimensional diagram of the middle filter tank;

[0044] Figure 3 for Figure 2 Another stereogram of

[0045] Figure 4 for Figure 2 Schematic diagram of the internal structure;

[0046] Figure 5 for Figure 4 Schematic diagram of the internal structure of the middle filter capsule and control mechanism;

[0047] Figure 6 for Figure 4 A three-dimensional diagram of the control mechanism;

[0048] Figure 7 for Figure 6 A magnified view of point A;

[0049] Figure 8 for Figure 7 An enlarged schematic diagram of the blocking component;

[0050] Figure 9 for Figure 5 Enlarged view of point B.

[0051] Reference numerals:

[0052] 10. Filter tank; 11. Three-way ball valve; 12. Partition; 13. Mounting hole; 14. Top cover;

[0053] 20. Filter capsule; 21. Connecting ring; 211. Guide hole; 22. Cylindrical filter screen; 221. First conical cylinder; 222. Second conical cylinder; 23. Circular bottom screen;

[0054] 30. Control mechanism; 31. First mounting ring; 32. Guide rod; 33. Second mounting ring; 34. Mounting sleeve; 35. Sliding ring; 351. Clearance gap; 36. First driving rod; 37. Blocking assembly; 371. Matching ring; 372. First blocking block; 373. First limiting block; 374. Connecting block; 375. Second blocking block; 376. Second limiting block; 38. Second driving rod; 39. Transition rod; 40. Square rod; 41. Motor; 42. Square sleeve. DETAILED DESCRIPTION

[0055] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0056] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0057] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of this utility model, "plurality" means more than two, unless otherwise specifically defined.

[0059] In this application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0060] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0061] See also Figures 1 to 8, this embodiment provides a duplex filter, including two filter tanks 10 and two three-way ball valves 11. The two three-way ball valves 11 are arranged up and down between the two filter tanks 10. The two openings of each three-way ball valve 11 are respectively connected to the corresponding filter tank 10. A partition 12 is provided in the filter tank 10. The partition 12 separates the filter tank 10 into an upper feed chamber and a lower discharge chamber. There are more than one mounting holes 13 on the partition 12; a vertically arranged filter capsule 20 is provided in the mounting hole 13, and the capsule body of the filter capsule 20 is located in the discharge chamber. The duplex filter also includes a control mechanism 30, and the filter capsule 20 can be folded vertically, with the end of the filter capsule 20 close to the partition 12 folded and the end of the filter capsule 20 away from the partition 12 stretched; the control mechanism 30 is used to control the partial filter capsule 20 in the folded state to stretch downward.

[0062] In this embodiment, referring to the prior art, the filter capsule 20 is installed in the mounting hole 13. The upper end of the filter capsule 20 is open and communicates with the feed chamber, which will not be described in detail here. When the filter capsule 20 of this duplex filter is installed in the mounting hole 13, the upper end of the filter capsule 20 is folded and stored, while the lower end of the filter capsule 20 is extended. Juice to be filtered passes through the upper three-way ball valve 11 and enters the feed chamber of the filter tank 10. The juice in the feed chamber enters the filter capsule 20 and is filtered at the lower end of the filter capsule 20. Over time, impurities accumulate at the lower end of the filter capsule 20, degrading the filtration effect. In this case, the control mechanism 30 controls the folded upper portion of the filter capsule 20 to extend downward, allowing the extended portion of the filter capsule 20 to filter, while the lower portion of the filter capsule 20, where impurities are attached, is folded and stored. This reduces the interval between filter capsule 20 replacements, avoids frequent replacement, and improves convenience. In other words, the foldable design of the filter capsule 20 can extend the replacement interval of the filter capsule 20.

[0063] In one embodiment, the filter capsule 20 includes a plurality of connecting rings 21 , a plurality of cylindrical filter nets 22 and a circular bottom net 23 .

[0064] Multiple connecting rings 21 are coaxially arranged vertically. Two adjacent connecting rings 21 are coaxially connected at each end of each cylindrical filter screen 22. A circular bottom screen 23 is connected to the inner wall of the lowest connecting ring 21 among the multiple connecting rings 21. The uppermost connecting ring 21 is positioned within the mounting hole 13. Specifically, the circular bottom screen 23 and the cylindrical filter screen 22 can utilize 60-mesh nylon filter screens.

[0065] In this embodiment, the connecting rings 21 can be brought close to each other to achieve the folding of the filter capsule 20 .

[0066] In one embodiment, the cylindrical filter screen 22 includes a first conical portion 221 and a second conical portion 222 .

[0067] The first conical cylindrical portion 221 has a large diameter end and a small diameter end, and the large diameter end of the first conical cylindrical portion 221 is connected to the inner wall of the corresponding connecting ring 21. The second conical cylindrical portion 222 has a large diameter end and a small diameter end, and the small diameter end of the second conical cylindrical portion 222 is connected to the small diameter end of the first conical cylindrical portion 221, and the large diameter end of the second conical cylindrical portion 222 is connected to the inner wall of the corresponding connecting ring 21.

[0068] In this embodiment, the structures of the first conical portion 221 and the second conical portion 222 of the cylindrical filter screen 22 can make the filter capsule 20 fold smoothly. In addition, the filtering area can be increased, thereby improving the overall filtering efficiency.

[0069] In one embodiment, the control mechanism 30 includes a first mounting ring 31 , a plurality of vertically arranged guide rods 32 , and a second mounting ring 33 .

[0070] The first mounting ring 31 rests against the opening of the mounting hole 13 and can be connected to the partition 12. Specifically, two connecting posts are provided on the partition 12, corresponding to each mounting hole 13. The two connecting posts are located on either side of the mounting hole 13. The first mounting ring 31 has through-holes through which it is mounted on the two connecting posts. Bolts connect the first mounting ring 31 to the connecting posts, which rest against the first mounting ring 31, pressing it against the partition 12. The outer ring of the first mounting ring 31 rests on the partition 12, while the inner ring of the first mounting ring 31 is located above the opening of the mounting hole 13.

[0071] The upper ends of the guide rods 32 pass through the mounting holes 13 and connect to the lower ends of the mounting rings. A second mounting ring 33 connects to the ends of the guide rods 32 that are distal from the first mounting ring 31. A guide hole 211 is defined in the connecting ring 21, corresponding to each guide rod 32. The guide holes 211 vertically slide with the corresponding guide rod 32. A cylindrical filter screen 22 connects the uppermost connecting ring 21 of the multiple connecting rings 21 to the mounting ring.

[0072] In this embodiment, the connecting ring 21 can slide up and down on the guide rod 32 , thereby achieving the folding or stretching of the entire filter capsule 20 .

[0073] In one embodiment, the control mechanism 30 further includes a mounting sleeve 34 , two sliding rings 35 , a first driving rod 36 and a blocking assembly 37 .

[0074] The mounting sleeve 34 is arranged vertically, with the lower end of the mounting sleeve 34 inserted into the filter capsule 20, and the upper end of the mounting sleeve 34 connected to the first mounting ring 31. Two sliding rings 35 are vertically slidably sleeved outside the mounting sleeve 34, and the two sliding rings 35 are respectively connected to the inner walls of the corresponding connecting rings 21. The lower end of the first drive rod 36 passes through the mounting sleeve 34, and the first drive rod 36 is dynamically sealed with the inner wall of the mounting sleeve 34, and the first drive rod 36 is rotatable. The blocking assembly 37 is connected to the lower end of the first drive rod 36, and the blocking assembly 37 can be abutted against the lower end of the sliding ring 35. A clearance notch 351 is provided on the inner ring of the sliding ring 35; the clearance notch 351 allows the blocking assembly 37 to pass through. The clearance notches 351 on the two sliding rings 35 are offset.

[0075] In this embodiment, the first driving rod 36 rotates to drive the blocking assembly 37 to rotate. When the blocking assembly 37 rotates to the clearance notch 351 of the sliding ring 35, the sliding ring 35 can slide down.

[0076] Specifically, multiple connecting rings 21 are folded outside the mounting sleeve 34, two of which are connected to the sliding ring 35. The sliding ring 35 is heavy and cannot move downward due to the blocking of the blocking assembly 37. Once the first driving rod 36 rotates and the blocking assembly 37 rotates to the clearance notch 351 of the sliding ring 35, the sliding ring 35 can move downward, thereby causing part of the filter capsule 20 to expand, while the filter capsule 20 below is folded.

[0077] In one embodiment, the blocking assembly 37 includes a matching ring 371 , a first blocking block 372 , a first limiting block 373 , a connecting block 374 , a second blocking block 375 , and a second limiting block 376 .

[0078] The mating ring 371 is rotatably mounted on the first drive rod 36. The first stopper 372 is connected to the outer wall of the mating ring 371. The upper end surface of the first stopper 372 transitions to the arcuate side surfaces on both sides, and the upper end surface of the first stopper 372 can abut against the lower end of the sliding ring 35. The first limit block 373 is connected to the lower end of the first stopper 372.

[0079] The connecting block 374 is connected to the outer wall of the first driving rod 36. The lower end of the second blocking block 375 is connected to the connecting block 374 and is located on one side of the first blocking block 372. The lower end of the second limiting block 376 is connected to the connecting block 374.

[0080] The first limiting block 373 is located between the second limiting block 376 and the second stop block 375. When the upper ends of the first stop block 372 and the upper ends of the second stop block 375 approach each other, they can pass through the clearance notch 351. When the second stop block 375 moves away from the first stop block 372, the rotation of the first driving rod 36 drives the sliding ring 35 located below the second stop block 375 to move axially.

[0081] In this embodiment, the sliding ring 35 is pressed against the first stopper 372 under the action of gravity. When the first drive rod 36 rotates in direction 1, the second stopper 375 moves away from the first stopper 372, and the first stopper 373 and the second stopper 376 abut against each other, preventing them from separating. At this point, the second stopper 375 and the first stopper 372 are expanded as a whole and cannot pass through the clearance gap 351. If the sliding ring 35 is located below the second stopper 375 at this time, the rotation of the first drive rod 36 can drive the sliding ring 35 downward, thereby expanding the filter capsule 20. When the second stopper 375 moves closer to the first stopper 372, it can pass through the clearance gap 351.

[0082] In one embodiment, the control mechanism 30 also includes a second drive rod 38 and a transition rod 39; the second drive rod 38 is coaxially connected to the lower end of the first drive rod 36; the transition rod 39 is coaxially connected to the lower end of the second drive rod 38; the second drive rod 38 can be threadedly connected to the inner wall of the sliding ring 35; the transition rod 39 can be slidably matched with the inner wall of the sliding ring 35.

[0083] In this embodiment, the first drive rod 36 rotates in one direction, causing a sliding ring 35 to move downward to the second drive rod 38 after passing the first and second stoppers. The first drive rod 36 then reverses, and the second drive rod 38 simultaneously reverses and engages with the inner wall of the sliding ring 35, thereby driving the sliding ring 35 downward and expanding the filter capsule 20. This continues until the sliding ring 35 moves to the transition rod 39 and disengages from the second drive rod 38.

[0084] In one embodiment, the filter tank 10 includes an openable and closable top cover 14. The control mechanism 30 further includes a square rod 40 and a motor 41.

[0085] The square rod 40 is connected to the upper end of the first driving rod 36. The motor 41 is arranged on the top cover 14, and the output end of the motor 41 is connected to the square sleeve 42. The square sleeve 42 can be sleeved on the outside of the corresponding square rod 40.

[0086] In this embodiment, when the top cover 14 is closed, the square sleeve 42 is aligned with the square rod 40 and lowered, so that the motor 41 can drive the square rod 40 and drive the first drive rod 36 to rotate. In addition, the upper end of the square rod 40 can be configured as a quadrangular pyramid to facilitate alignment of the square sleeve 42 when it is installed on the square rod 40.

[0087] In the specification of the present invention, a large number of specific details are described. However, it is understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A double filter, comprising two filter tanks and two three-way ball valves (11); the two three-way ball valves (11) are arranged vertically between the two filter tanks (10); the two openings of each three-way ball valve (11) are respectively connected to the corresponding filter tank (10); a partition (12) is provided in the filter tank (10); the partition (12) separates the filter tank (10) into an upper feed chamber and a lower discharge chamber; the partition (12) is provided with one or more mounting holes (13); a vertically arranged filter capsule (20) is provided in the mounting hole (13), and the capsule body of the filter capsule (20) is located in the discharge chamber; characterized in that It also includes a control mechanism (30); the filter capsule (20) can be folded vertically; the filter capsule (20) is folded at one end close to the partition (12), and stretched at one end away from the partition (12); the control mechanism (30) is used to control the folded portion of the filter capsule (20) to stretch downward.

2. A duplex filter according to claim 1, characterized in that: The filter capsule (20) comprises: A plurality of connecting rings (21) are coaxially arranged vertically; A plurality of cylindrical filter screens (22), wherein two adjacent connecting rings (21) at both ends of each cylindrical filter screen (22) are coaxially connected; and A circular bottom net (23) connected to the inner wall of the lowest connecting ring (21) among the plurality of connecting rings (21); The uppermost connecting ring (21) among the plurality of connecting rings (21) is arranged in the mounting hole (13).

3. A duplex filter as claimed in claim 2, characterized in that: The cylindrical filter (22) comprises: A first conical cylinder portion (221) has a large diameter end and a small diameter end, the large diameter end of the first conical cylinder portion (221) being connected to the inner wall of the corresponding connecting ring (21); and The second conical cylinder portion (222) has a large diameter end and a small diameter end, the small diameter end of the second conical cylinder portion (222) is connected to the small diameter end of the first conical cylinder portion (221), and the large diameter end of the second conical cylinder portion (222) is connected to the inner wall of the corresponding connecting ring (21).

4. A duplex filter as claimed in claim 3, characterized in that: The control mechanism (30) comprises: A first mounting ring (31) is pressed against the opening of the mounting hole (13) and can be connected to the partition (12); A plurality of vertically arranged guide rods (32), the upper ends of which pass through the mounting holes (13) and are connected to the lower ends of the mounting rings; and a second mounting ring (33) connected to one end of the plurality of guide rods (32) away from the first mounting ring (31); A guide hole (211) is provided on the connecting ring (21) corresponding to each guide rod (32); the guide hole (211) and the corresponding guide rod (32) are slidably engaged in the vertical direction; and the uppermost connecting ring (21) among the plurality of connecting rings (21) and the mounting ring are connected by providing a cylindrical filter screen (22).

5. A duplex filter as claimed in claim 4, characterized in that: The control mechanism (30) further includes: A mounting sleeve (34) is arranged vertically, with its lower end inserted into the filter capsule (20) and its upper end connected to the first mounting ring (31); Two sliding rings (35) are vertically slidably sleeved outside the mounting sleeve (34) and are respectively connected to the inner walls of the corresponding connecting rings (21); A first driving rod (36), the lower end of which passes through the mounting sleeve (34) and is dynamically sealed with the inner wall of the mounting sleeve (34) and is rotatable; and a blocking assembly (37) capable of abutting against the lower end of the sliding ring (35) and connected to the lower end of the first driving rod (36); A clearance notch (351) is provided on the inner ring of the sliding ring (35); the clearance notch (351) allows the blocking component (37) to pass through, and the clearance notches (351) on the two sliding rings (35) are staggered.

6. A duplex filter as claimed in claim 5, characterized in that: The blocking assembly (37) comprises: A matching ring (371) is rotatably sleeved on the first driving rod (36); A first blocking block (372) is connected to the outer wall of the matching ring (371), with both sides of its upper end surface transitioning to the arc surfaces of the two side surfaces, and its upper end surface can abut against the lower end of the sliding ring (35); A first limiting block (373) connected to the lower end of the first blocking block (372); a connecting block (374) connected to the outer wall of the first driving rod (36); A second blocking block (375), the lower end of which is connected to the connecting block (374), and is located on one side of the first blocking block (372); and A second limiting block (376), the lower end of which is connected to the connecting block (374); The first limiting block (373) is located between the second limiting block (376) and the second blocking block (375); the upper end of the first blocking block (372) and the upper end of the second blocking block (375) can move toward each other through the clearance gap (351); when the second blocking block (375) moves away from the first blocking block (372), the first driving rod (36) rotates to drive the sliding ring (35) located below the second blocking block (375) to move along its axial direction.

7. A duplex filter according to claim 6, characterized in that: The control mechanism (30) further includes a second drive rod (38) and a transition rod (39); the second drive rod (38) is coaxially connected to the lower end of the first drive rod (36); the transition rod (39) is coaxially connected to the lower end of the second drive rod (38); the second drive rod (38) can be threadedly connected to the inner wall of the sliding ring (35); and the transition rod (39) can be slidably matched with the inner wall of the sliding ring (35).

8. A duplex filter according to claim 7, characterized in that: The filter tank (10) includes an openable and closable top cover (14); The control mechanism (30) further includes: a square rod (40) connected to the upper end of the first driving rod (36); and A motor (41) is provided on the top cover (14), and an output end thereof is connected to a square sleeve (42); The square sleeve (42) can be sleeved outside the corresponding square rod (40).

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