Connecting device of filter and filtering system

Abstract

The utility model relates to a connecting device of a filter and a filtering system. The connecting device comprises a fixed part, a joint pipe and a movable part, one of the fixed part and the movable part is provided with a guide limiting groove, the other one of the fixed part and the movable part is fixedly provided with a guide limiting section, and the guide limiting section is installed in the guide limiting groove in a sliding mode so that the movable part and the fixed part can be connected in a sliding mode; the guide limiting section is in clearance fit with the guide limiting groove, the guide limiting groove comprises two limiting groove walls which are arranged at intervals in the horizontal direction, and the guide limiting section can incline relative to the connector pipe and abut against the two limiting groove walls correspondingly; the abutting positions of the guide limiting section and the two limiting groove walls are arranged at intervals in the height direction of the guide limiting groove so as to limit inclination of the movable part relative to the connector pipe, and the connector has the advantages that excessive inclination of the movable part in the up-down sliding process is avoided, and effective butt joint sealing can be formed between the connecting port and the connector pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of filter structures, and in particular to a filter connection device and a filter system. Background Technology

[0002] Filters are often used for the refining or separation of fluids such as liquids and gases. The filters that play the main filtering role usually have multiple connection ports for connecting to external pipelines. In order to achieve the disconnection or connection between the connection ports of the filter and the external pipeline, a connection device is generally used. Such a connection device usually includes a fixed part, a movable workbench, an operating part and a joint pipe, wherein the fixed part and the movable workbench are arranged at intervals and connected by an operating part, and the operating part can drive the movable workbench to approach or move away from the fixed part. When in use, the filter is installed on the movable workbench, and the multiple connection ports on the filter are aligned with the multiple joint pipes on the fixed part. The operating part is used to drive the movable workbench to approach the fixed part (move upward relative to the fixed part) to achieve the docking and sealing of the multiple connection ports and the multiple joint pipes, such as inserting the joint pipe into the connection port to achieve sealing. Similarly, the operating part is used to drive the movable workbench away from the fixed part (move downward relative to the fixed part) to achieve the separation of the multiple connection ports and the multiple joint pipes and release the seal.

[0003] For example, a Chinese patent with publication number CN112973262A discloses a connection device for a filter, including a fixed portion 4, a movable worktable 5, a guide mechanism 6 and an operating rod 7. The guide mechanism 6 includes vertical slots 61 located on both sides of the fixed portion 4 and second pin members 62 connected to both sides of the movable worktable 5. When an external force is applied to rotate the operating rod 7, the operating rod 7 rotates with the pivot pin 42 as a fulcrum, the first pin member 51 slides in the arc-shaped slide slot 71, and the second pin member 62 moves upward or downward in the vertical slot 61, thereby driving the filter 2 installed on the movable worktable 5 to move upward or downward. That is, the patent specifically discloses that the guiding function of the second pin member 62 and the vertical slot 61 of the guide mechanism 6 is used to realize the upward or downward movement of the movable worktable 5 in the vertical direction.

[0004] For details, please refer to the drawings of the specification of the above patent solution Figure 8 , the vertical moving direction of the movable table 5 is the Z-axis direction (ie Figure 8 up and down direction), the central axis direction of the circular second pin member 62 is the Y axis direction (that is, perpendicular to the front and rear direction of the circular second pin member 62 on the paper), and the direction perpendicular to both the Z axis direction and the Y axis direction is the X axis direction (that is, Figure 8Construct a three-dimensional coordinate system in the leftward and rightward directions (in the X-axis direction). Analyzing the movement process of the movable workbench 5 in the above solution, it can be seen that during the sliding process of the movable workbench 5 along the Z-axis direction, it is easy to tilt relative to the X-axis direction with the second pin member 62 as the fulcrum. That is, the movable workbench 5 is no longer horizontally arranged and forms an angle with the X-axis direction. The tilted movable workbench 5 will cause the filter 2 to tilt and become crooked, ultimately affecting the docking seal between the filter 2 and the pipe fitting 3. Among them, the specific reason why the movable workbench 5 is prone to tilting deviating from the X-axis direction during the movement along the Z-axis direction is:

[0005] The second pin member 62 of the guiding mechanism 6 is circular, and it is in point contact (a circle is tangent to a straight line) with the guiding groove wall of the vertical groove 61. That is, the circular second pin member 62 is in sliding contact and tangency with the two groove walls of the vertical groove 61 respectively. The second pin member 62 slides up and down along the groove wall of the vertical groove 61. That is, the vertical groove 61 can play a guiding role in the vertical direction for the second pin member 62. At the same time, the filter 2 with a certain weight is installed on the movable workbench 5, which will cause the movable workbench 5 to become heavier. Therefore, a certain force needs to be applied to the operating rod 7 to drive the movable workbench 5 to move up and down along the Z-axis direction. The operating rod 7 rotates with the pivot pin 42 as the fulcrum. The first pin member 51 slides in the arc-shaped chute 71, and the second pin member 62 moves up or down in the vertical groove 61. The second pin member 62 always maintains point tangency with the groove wall of the vertical groove 61. Therefore, the first pin member 51 is the force application position for the up and down movement of the movable workbench 5.

[0006] However, since the second pin member 62 of the guiding mechanism 6 is at a certain distance from the force application position, the first pin member 51, and in addition, the first pin member 51 slides in the first arc-shaped chute 71 overcoming some frictional resistance. Combining this point contact method between the second pin member 62 and the guiding groove wall of the vertical groove 61, there is always frictional resistance during the up and down sliding process of the second pin member 62 in the vertical groove 61, which is likely to cause the movable workbench 5 to tilt excessively deviating from the X-axis with the second pin member 62 as the fulcrum. Even if the above patent solution is provided with two guiding mechanisms 6 respectively located on both sides of the first pin member 51, due to the point contact fit method of the second pin member 62 and the vertical groove 61 of the two guiding mechanisms 6 and the different distances of the two guiding mechanisms 6 from the force application point, the second pin member 62, it will still cause the movable workbench 5 to tilt excessively deviating from the X-axis with the second pin member 62 as the fulcrum.

[0007] In addition, in the actual product where the above patent solution is applied, the second pin member 62 is a plastic lubricating part made of fluororesin to reduce the sliding friction between the second pin member 62 and the guiding groove wall of the vertical groove 61. After being used for a period of time, the plastic lubricating part that is frequently stressed is deformed, and a rotatable gap is generated between it and the vertical groove 61. As a result, when the operating member 7 is operated, due to excessive rotation of the second pin member 62 itself without a limiting effect, excessive inclination with respect to the X-axis direction occurs during the movement of the movable table 5 along the Z-axis direction.

[0008] In summary, during the process of applying a force to the operating member to drive the movable table to move up and down, the mating method in which the second pin member is in point contact with the vertical groove not only easily causes the movable table to be excessively inclined away from the X-axis with the second pin member as the fulcrum, but also there is no corresponding limit for the second pin member when the movable table deviates from the X-axis, resulting in excessive deflection of the filter on the movable table and affecting the docking seal between the filter and the pipe fitting.

[0009] Therefore, it is urgent for those skilled in the art to provide a filter connection device that can ensure that the movable table does not tilt excessively during the up and down sliding process. Summary of the Utility Model

[0010] The technical problem to be solved by the present utility model is to overcome the defects in the prior art, so as to provide a connection device for a filter and a filtration system.

[0011] To achieve the above object, the present utility model adopts the following technical solutions:

[0012] A connection device for a filter, the connection device includes a fixed part, a joint pipe passing through the fixed part, and a movable part for installing the filter; the movable part can move up and down relative to the fixed part to dock and seal or disconnect the connection port of the filter with the joint pipe; one of the fixed part and the movable part is provided with a guiding and limiting groove extending in a direction parallel to the joint pipe, and the other is fixed with a guiding and limiting section extending in a direction parallel to the joint pipe, and the guiding and limiting section is slidably installed in the guiding and limiting groove to enable a sliding connection between the movable part and the fixed part; the guiding and limiting section and the guiding and limiting groove are in clearance fit, the guiding and limiting groove includes two limiting groove walls arranged at intervals horizontally, the guiding and limiting section can be inclined relative to the joint pipe and respectively abut against the two limiting groove walls, and the abutting positions of the guiding and limiting section with the two limiting groove walls are arranged at intervals in the height direction of the guiding and limiting groove to limit the inclination of the movable part relative to the joint pipe.

[0013] Through the above technical solution, the sliding connection between the movable part and the fixed part is realized by the sliding fit between the guiding and limiting section and the guiding and limiting groove. When the movable part is driven by force, it can move up and down relative to the fixed part. The guiding and limiting groove is arranged to extend along the direction parallel to the joint pipe, which can ensure that the moving directions of the movable part and the filter are basically parallel to the direction of the joint pipe, thus facilitating the effective butt joint and sealing between the connecting port of the filter and the joint pipe.

[0014] During the up and down movement of the movable part, when the movable part is tilted due to force, the guiding and limiting section is tilted relative to the joint pipe and abuts against the two limiting groove walls respectively. And the abutting positions of the guiding and limiting section and the two limiting groove walls are arranged at intervals in the height direction. Therefore, the guiding and limiting section has a certain height. The clearance fit between the guiding and limiting section and the guiding and limiting groove will allow the guiding and limiting section to have a slight inclination margin, and also reduce the sliding friction force between the guiding and limiting section and the limiting groove walls of the guiding and limiting groove. Through an appropriate small clearance, the inclination amplitude of the guiding and limiting section can be controlled. When the guiding and limiting section has an excessive inclination trend relative to the joint pipe, due to the fact that the abutting positions of the guiding and limiting section and the two limiting groove walls are arranged at intervals in the height direction, the guiding and limiting section cannot further expand the inclination, which can further limit the inclination degree (inclination angle) of the guiding and limiting section relative to the joint pipe, so as to limit the inclination degree of the movable part and the filter relative to the joint pipe, which is beneficial to the effective butt joint and sealing between the connecting port of the filter and the joint pipe.

[0015] In addition, compared with the point-contact and non-clearance fit method in the prior art, the cooperation of the guiding and limiting section with a certain height and the existence of the clearance work together. It changes the situation that there is no clearance allowed between the guiding pin in point contact and the guiding groove to allowing a certain clearance between the two, overcoming the general cognitive bias of technicians. The advantages of the clearance fit between the guiding and limiting section with a certain height and the guiding and limiting groove are that the clearance reduces the friction force between the guiding and limiting section and the guiding and limiting groove, which is beneficial to the smooth up and down sliding of the guiding and limiting section without jamming, and also enables the guiding and limiting section to tilt in the presence of the clearance and thus has the function of preventing the movable part from tilting excessively.

[0016] Preferably, the guiding and limiting section is arranged as a continuously extending strip-shaped limiting plate, and / or, the end of the guiding and limiting groove is open, and the guiding and limiting section can partially slide out of the opening of the guiding and limiting groove to the outside of the guiding and limiting groove along the height direction of the guiding and limiting groove.

[0017] Through the above technical solution, while the guiding limiting groove can guide the continuously extending strip-shaped limiting plate, the frictional resistance exerted on the continuously extending strip-shaped limiting plate by the limiting groove wall of the guiding limiting groove can be reduced, facilitating the smooth up-and-down sliding of the strip-shaped limiting plate in the guiding limiting groove. At the same time, when the continuously extending strip-shaped limiting plate is slightly tilted, both ends of the strip-shaped limiting plate can abut against the two limiting groove walls of the guiding limiting groove, thereby limiting the movable part and avoiding excessive tilting of the movable part. As a whole, the continuously extending strip-shaped limiting plate can increase its own strength and anti-deformation ability, and avoid excessive deformation of itself when stressed at both ends, resulting in an overly large gap.

[0018] Furthermore, the end of the guiding limiting groove is provided with an opening. On the one hand, it is convenient for the guiding limiting section to be assembled into it from the end of the guiding limiting groove. On the other hand, it provides enough up-and-down sliding stroke for the guiding limiting section with a certain height. The guiding limiting section with a certain height slides in and out from the opening at the end of the guiding limiting groove until the connection port of the joint pipe and the filter is effectively docked and sealed, avoiding the insufficient up-and-down sliding stroke of the guiding limiting section from affecting the docking and sealing of the joint pipe and the connection port.

[0019] In addition, when the continuously extending strip-shaped limiting plate and the opening at the end of the guiding limiting groove cooperate synergistically, there are unexpected effects. On the basis of meeting the sliding stroke, even if a part of the continuously extending strip-shaped limiting plate slides out to the outside of the guiding limiting groove, the part of the strip-shaped limiting plate located inside the guiding limiting groove still has a certain height that can be tilted to abut against the limiting groove wall for excessive tilting limit, ensuring that the joint pipe and the connection port after docking and sealing will not be damaged due to excessive tilting of the movable part and the achieved seal will not be broken.

[0020] Preferably, it further includes an operating member, and the operating member is rotatably connected to the fixing member through a pivot shaft; the joint pipe extends vertically, the fixing member has a positioning guiding groove arranged parallel to the joint pipe, the operating member has an arc-shaped groove, a guiding shaft is fixed on the movable part, and the positioning guiding groove and the arc-shaped groove are arranged in a cross manner, and the guiding shaft passes through the positioning guiding groove and the arc-shaped groove; when the operating member pivots, the guiding shaft slides along the positioning guiding groove to drive the movable part to move up and down.

[0021] Through the above technical solution, the joint pipe is arranged to extend vertically. Therefore, the guiding limiting groove, the guiding limiting section and the positioning guiding groove are all arranged to extend vertically. The positioning guiding groove and the arc groove provided on the operating member are arranged crosswise to limit the position of the guiding shaft. When the operating member is controlled to pivot along the pivot shaft, the guiding shaft slides in the arc groove and the positioning guiding groove, so that the movable member slides vertically. The guiding limiting section also slides basically vertically in the guiding limiting groove, and the sliding friction resistance is small. When the movable member tilts, the guiding limiting section tilts in the guiding limiting groove and abuts against the two limiting groove walls respectively to limit the excessive tilting of the movable member.

[0022] Preferably, the length of the guiding limiting section is H, and the shortest distance from the guiding shaft to the guiding limiting groove is L, and H≥L.

[0023] Through the above technical solution, the length H of the guiding limiting section and the shortest distance L from the guiding shaft to the guiding limiting groove are set such that H≥L, so that after the guiding limiting section tilts slightly at a certain angle and abuts against the limiting groove wall, a lever structure is formed. The guiding shaft is the force application position for the movement of the movable member, so that L is the power arm and H is the resistance arm. When the force applied by the guiding shaft is basically constant, the resistance received by the guiding limiting section against the limiting groove wall will not be too large, which not only avoids large deformation of the guiding limiting section itself and affects its limiting effect on the movable member, but also avoids excessive resistance applied by the guiding limiting section to the limiting groove wall and further affects the sliding guiding cooperation between the guiding limiting section and the limiting groove wall.

[0024] Preferably, the vertical center line of the positioning guiding groove and the central axis of the pivot shaft are located in the same vertical plane.

[0025] Through the above technical solution, the positioning guiding groove defines the movement track of the guiding shaft. The pivot shaft is a pivot fulcrum with a fixed position. The vertical center line of the positioning guiding groove and the central axis of the pivot shaft are in the same vertical plane, that is, the guiding shaft and the pivot shaft are in the same vertical plane, which is beneficial to the more stable application of force by the guiding shaft and the pivot shaft to the movable member, and is beneficial to the up-and-down guiding cooperation between the guiding limiting section and the guiding limiting groove.

[0026] Preferably, a plurality of joint pipes are arranged along a preset track, and the vertical plane where the central axis of the guiding shaft is located passes through the preset track.

[0027] Through the above technical solution, when the operating member pivots, the force application drive of the guide shaft causes the movable member to move up and down. During the docking process of the filter and the connecting pipe, the force application direction of the guide shaft on the operating member is vertically upward, that is, the guide shaft moves upward along the positioning guide groove. After the connecting port of the filter is docked with the connecting pipe, there will be an interaction, and the vertical plane where the central axis of the guide shaft is located passes through the preset trajectory, so that the vertical plane where the force application position of the guide shaft is located passes through the area formed by the preset trajectory, so that the distance between the force application position of the guide shaft and the interaction position of the connecting pipe on the connecting port in the X-axis direction is not too large, so that the force on the movable member during its up and down movement is more uniform, ensuring the effective docking and sealing of the connecting port of the filter and the connecting pipe.

[0028] Preferably, the fixing member includes a top plate and two side plates respectively located on both sides of the top plate. The space enclosed by the top plate and the two side plates is used to accommodate the movable member; the movable member includes a support portion detachably connected to the filter and side portions extending from both sides of the support portion. Each side portion is located inside each side plate. The guiding and limiting section is fixed to the outer surface of the side portion, and the guiding and limiting groove is formed in the side plate.

[0029] Through the above technical solution, the two side portions of the movable member are respectively inside the two side plates of the fixing member. Then, through the connection relationship of other components, that is, it is limited that the movable member can hardly tilt in the Y-axis direction, and the movable member can still tilt in the X-axis direction. Therefore, the guiding and limiting groove is formed in the side plate, and the guiding and limiting section is arranged on the side portion. Furthermore, through the interaction between the side portion and the side plate, the excessive tilting limit of the movable member in the X-axis direction can be realized, so as to ensure the effective docking and sealing of the connecting port of the filter and the connecting pipe.

[0030] Preferably, the movable member further includes a lug detachably arranged on the upper surface of the support portion. The lug is located inside the side portion, and the lug has a groove for clamping the filter.

[0031] Through the above technical solution, the groove provided on the lug can limit the filter, prevent the filter itself from tilting or shifting on the movable member, and ensure the stability of the installation of the movable member and the filter. And the lug is detachably installed on the movable member, and the lug can be replaced according to different types of filters, increasing the application range of the connecting device.

[0032] Preferably, the connection line between one end of the arc-shaped groove and the pivot shaft is the first connection line, and the connection line between the other end of the arc-shaped groove and the pivot shaft is the second connection line. The included angle between the first connection line and the second connection line is 60° to 120°; alternatively, a plastic collar is sleeved on the guide shaft. The plastic collar includes a first lubricating portion clamped between the operating member and the fixing member and a second lubricating portion clamped between the movable member and the fixing member. The outer end of the guide shaft has an anti-detachment flange located outside the arc-shaped groove.

[0033] Through the above technical solution, the connecting device is applied in a very narrow space, and other objects may be placed on the fixing member. The included angle between the first connection line and the second connection line is set at 60° to 120°. Therefore, on the premise of ensuring a sufficient height change amount (i.e., the required displacement of the filter) of the filter, the rotation space range of the operating member can be controlled within a reasonable range. When the staff rotates the operating member, it can be avoided that the operating member interferes with the objects stacked on the fixing member, and it can also be avoided that the operating member interferes with other components in the narrow space.

[0034] Furthermore, the plastic collar is arranged on the guide shaft. The first lubricating portion can reduce the friction force between the fixing member and the operating member, and the second lubricating portion reduces the friction force between the movable member and the fixing member. The plastic collar serves as a lubricating medium, facilitating the stable rotation of the operating member to drive the up and down sliding of the movable member. The anti-detachment flange on the guide shaft prevents the guide shaft from detaching from the arc-shaped groove, ensuring the stable connection between the guide shaft and the operating member.

[0035] The present utility model further provides a filtering system, including a filter and the connecting device as described in any one of the above. During use, it is necessary to assemble the filter and the movable member of the connecting device.

[0036] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0037] By using the sliding fit between the guiding and limiting section and the guiding and limiting groove, the sliding connection between the movable member and the fixing member is realized. When the movable member is driven by force, it can move up and down relative to the fixing member. The guiding and limiting groove extends along the direction parallel to the joint pipe, which can ensure that the moving direction of the movable member and the filter is basically parallel to the direction of the joint pipe, thereby facilitating the docking and sealing between the connecting port of the filter and the joint pipe.

[0038] During the up-and-down movement of the movable part, when the movable part tilts due to the applied force, the guiding and limiting section tilts relative to the joint pipe and abuts against the two limiting groove walls respectively. The abutting positions of the guiding and limiting section against the two limiting groove walls are arranged at intervals in the height direction. Therefore, the guiding and limiting section has a certain height. The clearance fit between the guiding and limiting section and the guiding and limiting groove allows the guiding and limiting section to have room for tilting and reduces the frictional force between the guiding and limiting section and the limiting groove walls of the guiding and limiting groove. When the guiding and limiting section has an excessive tilting tendency relative to the joint pipe, due to the fact that the abutting positions of the guiding and limiting section against the two limiting groove walls are arranged at intervals in the height direction, the guiding and limiting section cannot tilt further, which can further limit the tilting degree (tilting angle) of the guiding and limiting section relative to the joint pipe, so as to limit the tilting degree of the movable part and the filter relative to the joint pipe, which is beneficial to the docking of the connection port of the filter and the joint pipe.

[0039] In addition, compared with the point-contact and non-clearance fitting method in the prior art, the combination of the guiding and limiting section with a certain height and the existence of the clearance changes the situation where there is no clearance allowed between the point-contact guiding and limiting section and the guiding and limiting groove to allowing a certain clearance between the two, overcoming the general cognitive bias of technicians. The advantages of the clearance fit between the guiding and limiting section with a certain height and the guiding and limiting groove are that the clearance reduces the frictional force between the guiding and limiting section and the guiding and limiting groove, which is beneficial to the up-and-down sliding of the guiding and limiting section, and also enables the guiding and limiting section to tilt in the presence of the clearance and has the function of preventing the movable part from tilting excessively. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention.

[0042] Figure 2 It is Figure 1 a front view schematic diagram.

[0043] Figure 3 It is Figure 2 a partial sectional view schematic diagram.

[0044] Figure 4 It is Figure 3 an enlarged schematic diagram of position A in

[0045] Figure 5 It isFigure 1 Schematic diagram of the connection between the fixed part and the movable part (the operating part is omitted).

[0046] Figure 6 Schematic diagram of the preset trajectory of the adapter pipe and the position of the P plane in another example.

[0047] Figure 7 For Figure 1 Schematic diagram of the fixed part in

[0048] Figure 8 For Figure 1 Schematic diagram of the movable part in

[0049] Figure 9 For Figure 2 Schematic diagram of the section along the G-G section.

[0050] Figure 10 For Figure 9 Enlarged schematic diagram of position B in

[0051] Figure 11 For Figure 2 Schematic diagram of the structure where the guiding and limiting section is inclined and in the limiting state (the operating part is omitted) in

[0052] Figure 12 For Figure 11 Enlarged schematic diagram of position C in

[0053] Figure 13 For Figure 2 Schematic diagram of the structure where the guiding and limiting section is in the limiting state after extending out of the guiding and limiting groove (the operating part is omitted) in

[0054] Figure 14 For Figure 13 Enlarged schematic diagram of position E in

[0055] Figure 15 Schematic diagram of the structure where the guiding and limiting section extends out of the guiding and limiting groove in another embodiment.

[0056] Figure 16 For Figure 15 Enlarged schematic diagram of position K in

[0057] Figure 17 Schematic diagram of Example 2.

[0058] Figure 18 For Figure 11 Schematic diagram of the connection between the filter and the movable part in

[0059] Explanation of reference numerals:

[0060] 100. Filter; 101. Connection port; 1. Fixing member; 11. Positioning guide groove; 12. Top plate; 13. Side plate; 14. Connecting plate; 2. Connector tube; 3. Movable member; 31. Guide shaft; 311. Anti - detachment flange; 32. Support portion; 33. Side portion; 34. Lugs; 341. Groove; 35. Pressure plate; 4. Guide limiting groove; 41. Limiting groove wall; 5. Guide limiting section; 6. Operating member; 61. Arc groove; 7. Pivot shaft; 8. Plastic collar; 80. Intermediate lubricating portion; 81. First lubricating portion; 82. Second lubricating portion. Detailed implementation mode

[0061] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0062] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0063] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0064] Embodiment 1

[0065] See Figures 1 to 16The embodiment of the utility model provides a connection device for a filter, which includes a fixing member 1, a joint pipe 2 passing through the fixing member 1, and a movable member 3 for installing a filter 100. The joint pipe 2 passes through the fixing member 1 and can be stably installed on the fixing member 1. The movable member 3 can move up and down relative to the fixing member 1 to connect and seal or separate the connection port 101 of the filter 100 from the joint pipe 2. The filter 100 and the connection port 101 are referenced Figure 17 and Figure 18 Reference numerals in .

[0066] Specifically, when the movable part 3 moves upward relative to the fixed part 1, the connection port 101 of the filter 100 is butted and sealed with the joint pipe 2. When the movable part 3 moves downward relative to the fixed part 1, the connection port 101 of the filter 100 is disengaged from the joint pipe 2 to release the seal. It should be noted that "up and down movement" includes vertical up and down movement and oblique up and down movement, which mainly depends on the extension setting of the joint pipe 2. If the joint pipe 2 is set vertically, the movable part 3 must move up and down in the vertical direction to ensure that the filter 100 moves up and down in the vertical direction, so that the connection port 101 and the joint pipe 2 are aligned for butt sealing.

[0067] It is worth noting that the "joint pipe 2" referred to here is a pipe section extending in a straight line along the moving direction of the movable part 3, that is, a pipe section parallel to or coincident with the central axis of the connection port of the filter, and does not include a bent pipe section (such as a horizontal pipe section) provided for connecting to an external structure (such as an external pipeline), for example, only an attached Figure 1 The vertically extending joint pipe 2 shown in .

[0068] For the convenience of explanation, the axial direction of the joint pipe 2 is taken as the Z axis (see Figure 1 and Figure 2 ), with the direction in which the movable part 3 is installed on the fixed part 1 (i.e., the direction from the side of the fixed part 1 with an opening to the mounting cavity of the fixed part 1 where the movable part 3 is installed) as the X axis (see Figure 1 and Figure 2 ), with the line perpendicular to the Z and X axes as the Y axis (see Figure 1 ) to construct a three-dimensional coordinate system.

[0069] In order to achieve a sliding connection between the movable member 3 and the fixed member 1, ensure that the movement direction of the movable member 3 and the filter 100 installed on the movable member 3 is substantially parallel to the extension direction of the joint pipe 2, which is conducive to the effective butt joint and sealing between the connection port 101 of the filter 100 and the joint pipe 2. In this embodiment, a guiding and limiting groove 4 extending in the direction parallel to the joint pipe 2 (Z-axis direction) is provided on the fixed member 1. The guiding and limiting groove 4 includes two limiting groove walls 41 arranged at intervals along the horizontal direction (X-axis direction); a guiding and limiting section 5 extending in the direction parallel to the joint pipe 2 (Z-axis direction) is fixed on the movable member 3. The guiding and limiting section 5 is slidably installed in the guiding and limiting groove 4 so as to form a sliding connection between the movable member 3 and the fixed member 1.

[0070] Of course, in other embodiments, the guiding and limiting groove 4 can also be provided on the movable member 3, and the guiding and limiting section 5 can be provided on the fixed member 1, as long as a sliding connection between the movable member 3 and the fixed member 1 can be achieved and the movement direction of the movable member 3 and the filter 100 installed on the movable member 3 is substantially parallel to the extension direction of the joint pipe 2.

[0071] Since the guiding mechanism / guiding part in the existing solution is usually set as a circular pin member tangent to the guiding groove (see the background art), during the process of the circular pin member sliding along the guiding groove, it is easy to cause the movable member 3 to tilt excessively relative to the X-axis direction with the circular pin member as the fulcrum, affecting the butt joint and sealing between the connection port of the filter and the joint pipe 2. In order to reduce the probability of this tilt, the existing technical solutions usually avoid the existence of a gap between the pin member and the side wall of the guiding groove (that is, the pin shaft member always abuts against the limiting groove wall 41 of the groove). However, according to the actual situation, the contact between the pin member and the guiding groove is a point contact. Avoiding the existence of a gap between the pin member and the side wall of the guiding and limiting groove 4 cannot limit the generation of this excessive tilt. And in order to reduce the sliding resistance of the pin member, the pin member is usually set as a plastic lubricating part. The plastic lubricating part will deform after multiple uses and form a gap with the guiding and limiting groove 4. The pin member itself is easy to move and tilt in the guiding groove without its own limiting function, which will further exacerbate the tilt degree of the movable member 3 and is not conducive to the butt joint and sealing between the connection port 101 of the filter 100 and the joint pipe 2.

[0072] In order to avoid the circular pin member and the guiding groove deforming after multiple uses and exacerbating the excessive tilt of the movable member 3, in this embodiment, the guiding and limiting section 5 and the guiding and limiting groove 4 are in clearance fit. The guiding and limiting section 5 can tilt relative to the joint pipe 2 and abut against the two limiting groove walls 41 respectively. The abutting positions of the guiding and limiting section 5 and the two limiting groove walls 41 are arranged at intervals in the height direction to limit the tilt of the movable member 3 relative to the joint pipe 2.

[0073] Therefore, there is no need to strictly control that there is no gap between the guiding and limiting section 5 and the guiding and limiting groove 4. Instead, a certain gap is allowed between the two. A reasonable setting of the size of the gap can prevent the moving part 3 from tilting excessively. When the guiding and limiting section 5 has a certain tendency to tilt relative to the joint pipe 2, since the two abutting positions of the guiding and limiting section 5 with the two limiting groove walls 41 are arranged at intervals in the height direction of the guiding and limiting groove 4, and the spaced abutting positions can limit the further rotation of the guiding and limiting section 5 in the guiding and limiting groove 4, further limiting the tilting degree (tilting angle) of the guiding and limiting section 5 relative to the joint pipe 2, restricting the tilting degree of the moving part 3 and the filter relative to the joint pipe 2, which is further beneficial to the docking of the connection port of the filter with the joint pipe 2.

[0074] It should be noted that the "the guiding and limiting section 5 can tilt relative to the joint pipe 2" mentioned in the above solution is not limited to the initial state (i.e., when it is made into a finished product). The gap between the guiding and limiting section 5 and the limiting groove wall 41 can reduce the friction between the guiding and limiting section 5 and the limiting groove wall 41. In the initial state, the guiding and limiting section 5 and the limiting groove wall 41 can also directly abut, or the guiding and limiting section 5 and the limiting groove wall 41 tilt and abut during the up and down movement of the moving part 3. The abutting positions of the guiding and limiting section 5 and the limiting groove wall 41 can be in surface contact, line contact or point contact.

[0075] The guiding and limiting section 5 can be set to various structures, which can be a continuous integral structure or discrete multiple split structures. For example, at least two blocks or pins are arranged at intervals in the height direction in the guiding and limiting groove 4, and at least two blocks or pins constitute the guiding and limiting section 5. Therefore, there is no specific limitation on the structure of the guiding and limiting section 5, as long as when the moving part 3 tilts relative to the joint pipe 2, the two abutting positions of the guiding and limiting section 5 with the two limiting groove walls 41 have a certain distance in the height direction. It should be noted that the "height direction" referred to here is the extending direction of the guiding and limiting groove 4, that is, the extending direction of the joint pipe 2.

[0076] See Figure 11 and 12 In this embodiment, referring to

[0077] Specifically, the strip-shaped limiting plate is arranged as a regular rectangular structure. Of course, in other embodiments, the guiding and limiting section 5 can also be arranged as an arc-shaped plate. In other embodiments, the guiding and limiting section 5 can also be arranged as a combined structure of several independent connecting blocks. That is, when the strip-shaped limiting plate is tilted, it is only necessary to ensure that there is a certain distance in the height direction between the two abutting positions of the strip-shaped limiting plate and the two limiting groove walls 41.

[0078] See the appendix Figure 13 and 14 , the guiding and limiting groove 4 can be closed at both ends, or at least one end of the guiding and limiting groove 4 can be open. The limiting groove 4 can also be a through groove in the Y direction or a blind groove in the Y direction. Preferably, the end of the guiding and limiting groove 4 is open, and the guiding and limiting section 5 can partially slide out of the opening along the height direction of the guiding and limiting groove 4 to the outside of the guiding and limiting groove 4. That is to say, the end of the guiding and limiting groove 4 is open, which is convenient for the guiding and limiting section 5 to be assembled into the guiding and limiting groove 4, and also ensures that the guiding and limiting section 5 with a certain height has enough sliding stroke. In this embodiment, the bottom end of the guiding and limiting groove 4 is an open through groove, and the guiding and limiting section 5 can slide out of the guiding and limiting groove 4 from the bottom end of the guiding and limiting groove 4.

[0079] The effect of the strip-shaped limiting plate combined with the open end of the guiding and limiting groove 4 is that even when a part of the guiding and limiting section 5 slides out of the guiding and limiting groove 4 and is located outside the groove, on the basis of ensuring that the guiding and limiting section 5 has enough sliding stroke, the other part of the guiding and limiting section 5 with an appropriate height remaining in the guiding and limiting groove 4 can still be inclined to abut against the two limiting groove walls 41 to form two abutting positions E1 and E2 to limit the excessive inclination of the movable part 3. Compared with the embodiment in which the guiding and limiting section 5 is composed of two short blocks or round pins arranged at discrete intervals, see Figure 15 and 16 , when the guiding and limiting groove 4 is a groove with an open end, once the guiding and limiting section 5 needs to have enough sliding stroke, there is a risk that one of the short blocks or round pins in the guiding and limiting section 5 slides out of the guiding and limiting groove 4. At this time, only one short block or round pin remains in the guiding and limiting groove 4, and the effect of restricting the rotation and inclination of the movable part 3 becomes worse.

[0080] See Figure 3 and 4 , in a specific embodiment, in the initial state of the installation and cooperation between the strip-shaped limiting plate and the guiding and limiting groove 4, the width W1 of the strip-shaped limiting plate in the X-axis direction is smaller than the width W2 of the guiding and limiting groove 4 in the X-axis direction, and both end faces of the strip-shaped limiting plate in the X-axis direction can be not in contact with the two limiting groove walls 41 of the guiding and limiting groove 4. Of course, in other embodiments, W1 is less than W2, one end face of the strip-shaped limiting plate contacts one limiting groove wall 41, and the other end face has a gap with the other limiting groove wall 41. For example Figure 4When the strip-shaped limiting plate in it is in a state of extending parallel along the Z-axis direction, when the movable member 3 tilts deviating from the X-axis direction, at this time the strip-shaped limiting plate tilts deviating from the Z-axis direction. The two ends of the strip-shaped limiting plate respectively abut against the two limiting groove walls 41 to form two abutting positions, one abutting position is above and the other abutting position is below, so that it is difficult for the strip-shaped limiting plate to further tilt deviating from the Z-axis direction under the abutting action of the two limiting groove walls 41, thereby preventing the movable member 3 from tilting excessively deviating from the X-axis direction.

[0081] In order to drive the movable member 3 to move up and down, in this embodiment, an operating member 6 is further included. The operating member 6 is rotatably connected to the fixing member 1 through a pivot shaft 7. The joint pipe 2 is arranged to extend vertically. The guiding and limiting section 5 and the guiding and limiting groove 4 are also arranged vertically. The fixing member 1 has a positioning and guiding groove 11 arranged parallel to the joint pipe 2. The operating member 6 has an arc-shaped groove 61. A guiding shaft 31 is fixed on the movable member 3. The positioning and guiding groove 11 and the arc-shaped groove 61 are arranged in a cross manner. The guiding shaft 31 passes through the positioning and guiding groove 11 and the arc-shaped groove 61. When the operating member 6 pivots, the guiding shaft 31 slides along the positioning and guiding groove 11 to drive the movable member 3 to move up and down vertically. Refer to Figure 2 and Figure 5 , in this embodiment, the positioning and guiding groove 11, the guiding shaft 31, and the pivot shaft 7 are all symmetrically arranged in two along the Y-axis direction with respect to the joint pipe 2, so that the force on the movable member 3 is more balanced.

[0082] The guiding and limiting groove 4 can be arranged on the left or right side of the pivot shaft 7 and the guiding shaft 31. There is no specific limitation on the setting position of the guiding and limiting groove 4. In this embodiment, refer to Figures 1 - 3 , the guiding and limiting groove 4 is located on the left side of the pivot shaft 7 and the guiding shaft 31. When the guiding and limiting section 5 tilts and abuts against the limiting groove wall 41, the abutting position of one end of the guiding and limiting section 5 against the limiting groove wall 41 is used as a fulcrum, and the guiding shaft 31 is used as a force application position to form a lever structure with the guiding and limiting section 5. In order to avoid too much resistance when the guiding and limiting section 5 abuts against the limiting groove wall 41, in this embodiment, the length of the guiding and limiting section 5 is H, and the shortest distance from the guiding shaft 31 to the guiding and limiting groove 4 is L, H≥L. Among them, L can be measured as the distance from the central axis line (center point) of the guiding shaft 31 to the limiting groove wall 41 close to the guiding shaft 31. Actually, the distance from any section on the guiding shaft 31 to the limiting groove wall 41 close to the guiding shaft 31 can be L. The reasonable setting of the length H of the guiding and limiting section 5 and the shortest distance L of the guiding and limiting groove 4, that is, H≥L, makes the resistance of the guiding and limiting section 5 not too large after tilting a certain angle, and avoids large deformation of the limiting section 5 itself and affecting its limiting effect on the movable member 3. Of course, in other embodiments, the guiding and limiting section 5 can also be set as a rigid structure, and the fixing member 1 can be set as a rigid structure, and the rigid structure is metal.

[0083] Refer toFigure 2 and Figure 5 In order to make the force on the movable member 3 more uniform and avoid a large interval deviation in the X-axis direction between the force-applying position of the guide shaft 31 and the pivot shaft 7, in this embodiment, the vertical center line L2-1 of the positioning guide groove 11 and the central axis L1 of the pivot shaft 7 are located in the same vertical plane P.

[0084] Specifically, in order to avoid too large a difference in the interval in the X-axis direction between the force-applying position of the operating member 6 on the movable member 3 and the force-applying position of the joint pipe 2 on the filter 100 on the movable member 3, so as to make the force on the movable member 3 more uniform and ensure the effective butt joint seal between the connection port 101 of the filter 100 and the joint pipe 2, in this embodiment, a plurality of joint pipes 2 are provided along a preset track, and the vertical plane where the central axis L2-2 of the guide shaft 31 is located passes through the preset track.

[0085] Furthermore, the preset track can be set to be linear. Refer to Figure 5 , three joint pipes 2 are arranged at intervals in the Y-axis direction, and the central axes L3-1, L3-2, and L3-3 of the three joint pipes 2 are located in the same vertical plane P, and the central axis L2-2 of the guide shaft 31 is also located in the vertical plane P. It can be known that the force F1 applied vertically upward to the guide shaft 31 (movable member 3) by the operating member 6 is located in the vertical plane P, while the joint pipe 2 applies a vertically downward force F2 to the movable member 3, thereby enabling the force on the movable member 3 to be more uniform and preventing the movable member 3 from tilting.

[0086] Refer to Figure 6 , in another embodiment, the preset track can be set to be triangular, that is, three joint pipes 2 are arranged along the horizontal plane and enclose a triangular horizontal plane S. The central axes L3-1, L3-2, and L3-3 of the three joint pipes 2 respectively pass through the three corners of the triangular track, and the vertical plane P where the central axis L2-2 of the guide shaft 31 is located passes through the triangular horizontal plane S. Preferably, the vertical plane P where the central axis L2-2 of the guide shaft 31 is located passes through the centroid of the triangular horizontal plane S.

[0087] Refer to Figure 1 , Figure 7 and Figure 8, in this embodiment, the fixing member 1 includes a top plate 12 and two side plates 13 respectively located on both sides of the top plate 12. The space enclosed by the top plate 12 and the two side plates 13 is used to accommodate the movable member 3. The movable member 3 includes a support portion 32 for disassembling and assembling with the filter and side portions 33 extending upward from both sides of the support portion 32. Each side portion 33 is located inside each side plate 13. The guiding and limiting section 5 is fixed to the outer surface of the side portion 33, and the guiding and limiting groove 4 is opened on the side plate 13. Thus, through the interaction between the side portion 33 and the side plate 13, the two-sided limiting of the movable member 3 in the Y-axis direction is realized, avoiding the lateral inclination of the movable member 3 relative to the Y-axis direction to ensure the effective butt joint sealing between the connection port of the filter and the joint pipe 2. It can be known that the top plate 12 is used to install the joint pipe 2, and the support portion 32 is used to support the filter.

[0088] Furthermore, on one side of the two top plates 12 in the X-axis direction, a connecting plate 14 is also fixedly provided. The upper end of the connecting plate 14 is fixedly connected to the top plate 12, which can not only increase the connection stability between the top plate 12 and the side plates 13, but also limit the movable member 3 to a certain extent to facilitate the positioning and installation of the movable member 3, and at the same time avoid the inclination of the movable member 3 towards the connecting plate 14 to a certain extent. It can be known that the end of the side plate 13 far from the connecting plate 14 is the insertion and removal entrance of the movable member 3 and the filter 100. Of course, in other embodiments, the connecting plate 14 may not be provided, and the top plate 12 and the side plates 13 may be directly fixedly connected.

[0089] Even further, the movable member 3 further includes a lug 34 detachably disposed on the upper surface of the support portion 32. The lug 34 is located inside the side portion 33, and the lug 34 has a groove 341 for clamping the filter 100. When the filter is installed, it is clamped in the groove 341 to limit the filter 100, avoiding the inclination or displacement of the filter 100 itself on the movable member 3 and ensuring the installation stability of the movable member 3 and the filter 100. And the lug 34 is detachably installed on the movable member 3, and the lug 34 can be replaced according to different types of filters 100, increasing the application range of the connecting device. In addition, since the filter 100 will be subjected to a certain force during use, the setting of the lug 34 can play a certain buffering effect to avoid the deformation of the movable member 3. At the same time, the lug 34 can be directly replaced after excessive deformation.

[0090] Even further, in order to increase the installation stability of the filter 100, the movable member 3 further includes a pressing plate 35. The pressing plate 35 is detachably installed on the upper end of the lug 34. When the filter 100 is installed, the pressing plate 35 presses on the upper end of the filter 100 to further ensure the connection stability between the filter 100 and the movable member 3.

[0091] See Figure 1 、 Figure 2, the connection line between one end of the arc-shaped groove 61 and the pivot shaft 7 is the first connection line X1, and the connection line between the other end of the arc-shaped groove 61 and the pivot shaft 7 is the second connection line X2. The included angle J between the first connection line and the second connection line can be set to 60°, 70°, 90° or 120°. Among them, the points determining X1 and X2 can be the centers of the arc at the end of the arc-shaped groove 61 to the center of the pivot shaft 7 or any point at the end of the arc-shaped groove 61 to the center of the pivot shaft 7. It can be known that the included angle can be reasonably set within the range of 60° to 120°, and specifically can be set according to the distance that the movable member 3 and the filter 100 need to be lifted.

[0092] See Figure 10 , a plastic collar 8 is sleeved on the guide shaft 31, and the outer end of the guide shaft 31 has an anti-detachment flange 311 located outside the arc-shaped groove 61. Among them, the plastic collar 8 is used for lubrication between the guide shaft 31 and the fixing member 1, between the fixing member 1 and the operating member 6, and between the fixing member 1 and the side portion 33 of the movable member 3 to reduce friction, ensure the smooth lifting of the movable member 3 and prevent jamming. The setting of the anti-detachment flange 311 on the guide shaft 31 is beneficial to the stable connection between the guide shaft 31 and the operating member 6.

[0093] Specifically, the plastic collar 8 has an "I" - shaped structure, including an intermediate lubricating portion 80 clamped between the outer wall of the guide shaft 31 and the inner wall of the through - hole opened on the fixing member 1. First lubricating portions 81 and second lubricating portions 82 are respectively and prominently provided at both ends of the intermediate lubricating portion 80. The first lubricating portion 81 is clamped between the operating member 6 and the fixing member 1 for lubrication between the fixing member 1 and the operating member 6 to reduce friction; the second lubricating portion 82 is located between the side portion 33 of the movable member 3 and the fixing member 1 for lubrication between the side portion 33 and the fixing member 1 to reduce friction. During the rotation of the operating member 6 and the process of driving the movable member 3 to move up and down, the entire connecting device will not jam.

[0094] Embodiment 2

[0095] See Figure 17 and Figure 18 , based on the above - mentioned Embodiment 1, this embodiment also provides a filtering system, including a filter 100 and the connecting device of Embodiment 1, wherein the connection port 101 of the filter 100 is used for butt - joint sealing with the joint pipe 2.

[0096] The top of the filter 100 is clamped in the groove 341 provided on the lug 34, and the pressing plate 35 is pressed on the upper end of the filter 100 to ensure the stable connection between the filter 100 and the movable member 3.

[0097] The above - mentioned implementation manners are only the preferred implementation manners of the present utility model, and cannot be used to limit the protection scope of the present utility model. Any non - substantial changes and substitutions made by those skilled in the art on the basis of the present utility model all belong to the scope of protection required by the present utility model.

Claims

1. A filter connection device, comprising a fixing member, a joint pipe passing through the fixing member, and a movable member for installing the filter; The movable part can move up and down relative to the fixed part to dock and seal or disengage the connection port of the filter with the joint pipe; the characteristics are: One of the fixed member and the movable member is provided with a guide limit groove extending in a direction parallel to the joint pipe, and the other is fixed with a guide limit segment extending in a direction parallel to the joint pipe, and the guide limit segment is slidably installed in the guide limit groove to enable the movable member and the fixed member to be slidably connected; The guide limit section is loosely matched with the guide limit groove, and the guide limit groove includes two limit groove walls arranged at intervals along the horizontal direction. The guide limit section can be tilted relative to the joint pipe and abut against the two limit groove walls respectively. The abutting positions of the guide limit section and the two limit groove walls are arranged at intervals in the height direction of the guide limit groove to limit the inclination of the movable part relative to the joint pipe.

2. A filter connection device according to claim 1, characterized in that: The guide limiting section is configured as a continuously extending strip-shaped limiting plate; and / or the end of the guide limiting groove is configured with an opening, and the guide limiting section can partially slide out of the guide limiting groove from the opening along the height direction of the guide limiting groove.

3. A filter connection device according to claim 1, characterized in that: It also includes an operating member, which is rotatably connected to the fixing member via a pivot shaft; The joint pipe is arranged to extend vertically, the fixing member has a positioning guide groove arranged parallel to the joint pipe, the operating member has an arc groove, a guide shaft is fixed on the movable member, the positioning guide groove and the arc groove are arranged crosswise, and the guide shaft is passed through the positioning guide groove and the arc groove; When the operating member pivots, the guide shaft slides along the positioning guide groove to drive the movable member to move up and down.

4. A filter connection device according to claim 3, characterized in that: The length of the guide limit section is H, the shortest distance from the guide shaft to the guide limit groove is L, and H≥L.

5. A filter connection device according to claim 3, characterized in that: The vertical center line of the positioning guide groove and the central axis of the pivot shaft are located on the same vertical plane.

6. A filter connection device according to claim 3, characterized in that: The joint pipe is provided with a plurality of joints along a preset track, and the vertical plane where the central axis of the guide shaft is located passes through the preset track.

7. A filter connection device according to any one of claims 1 to 3, characterized in that: The fixing member comprises a top plate and two side plates respectively located on both sides of the top plate, and the space enclosed by the top plate and the two side plates is used to accommodate the movable member; The movable part includes a supporting part that can be assembled and disassembled with the filter and side parts extending from both sides of the supporting part, each of the side parts is located on the inner side of each side plate, the guide limiting section is fixed to the outer surface of the side part, and the guide limiting groove is opened on the side plate.

8. A filter connection device according to claim 7, characterized in that: The movable part further comprises a lug detachably arranged on the upper surface of the supporting part, the lug is located on the inner side of the side part, and the lug has a groove for clamping the filter.

9. A filter connection device according to claim 3, characterized in that: The line between one end of the arc groove and the pivot axis is a first line, the line between the other end of the arc groove and the pivot axis is a second line, and the angle between the first line and the second line is 60° to 120°; Alternatively, a plastic ring is sleeved on the guide shaft, and the plastic ring includes a first lubrication portion clamped between the operating member and the fixed member and a second lubrication portion clamped between the movable member and the fixed member, and the outer end of the guide shaft has an anti-slip flange located outside the arc groove.

10. A filtering system, characterized in that: It comprises a filter and a connecting device connected to the filter, wherein the connecting device is the connecting device according to any one of claims 1 to 9.

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