Upper opening and closing structure of positive pressure filter

Abstract

An upper opening and closing structure of a positive pressure filter is arranged on the upper portion of the positive pressure filter, the positive pressure filter comprises an upper cover and a barrel, and a first clamping strip and a second clamping strip which are different in inner diameter are arranged on the upper end face of the barrel in the circumferential direction of the barrel. The sections of the first clamping strip and the second clamping strip are arc-shaped surfaces, and a first limiting groove is formed in the inner side face of the first clamping strip in the circumferential direction of the first clamping strip; a sealing gasket is arranged between the upper end face of the barrel and the upper cover, and a first clamping groove matched with the first clamping strip and a second clamping groove matched with the second clamping strip are formed in the lower end face of the sealing gasket. The first clamping strip and the second clamping strip which are different in inner diameter are arranged on the upper end face of the barrel body, the sealing gasket can be clamped and limited, the phenomenon that the sealing gasket is twisted and deformed under the action of the upper cover can be avoided under the rotation of the upper cover when the upper cover is aligned with the barrel body, and the phenomenon that the sealing gasket is damaged due to the twisting and deformation of the sealing gasket is reduced. And a gap is formed between the upper cover and the barrel, so that the sealing cannot be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of positive pressure filters, and particularly relates to an upper opening and closing structure of a positive pressure filter. Background Technique

[0002] A positive pressure filter is a device used for liquid filtration. It forces the liquid to pass through a filter medium by applying positive pressure to separate solid particles, microorganisms or other suspended substances in the liquid.

[0003] When the existing positive pressure filter is in use, the upper cover needs to be installed on the cylinder body of the positive pressure filter, and a sealing ring is also installed between the upper surface of the upper cover and the upper end surface of the cylinder body to seal the gap between the upper cover and the cylinder body. However, the upper surface and the lower surface of the sealing ring in the prior art are mostly flat, and the upper end surface of the cylinder body is also flat. When installing the upper cover on the cylinder body, the position of the upper cover often needs to be adjusted to align with the upper end surface of the cylinder body. When adjusting the upper cover, the sealing gasket will be distorted or misaligned with the upper end surface of the cylinder body under the action of the upper cover, affecting its sealing effect. Content of the Utility Model

[0004] In order to solve the technical problems existing in the above background technique, the utility model provides an upper opening and closing structure of a positive pressure filter.

[0005] The technical solution of the utility model is as follows:

[0006] An upper opening and closing structure of a positive pressure filter is arranged on the upper part of the positive pressure filter. The positive pressure filter includes an upper cover and a cylinder body. The upper end surface of the cylinder body is provided with a first clamping strip and a second clamping strip with different inner diameters along its circumferential direction. The inner diameter of the first clamping strip is located between the inner diameter of the cylinder body and the inner diameter of the second clamping strip;

[0007] The cross-sections of the first clamping strip and the second clamping strip are both arc-shaped surfaces, and a first limiting groove is formed along the circumferential direction on the inner side surface of the first clamping strip;

[0008] A sealing gasket is arranged between the upper end surface of the cylinder body and the upper cover. The lower end surface of the sealing gasket is provided with a first clamping groove matched with the first clamping strip and a second clamping groove matched with the second clamping strip.

[0009] The upper end surface of the cylinder body is provided with two clamping strips with different inner diameters, namely the first clamping strip and the second clamping strip, which can play a role in clamping and limiting the sealing gasket. When the upper cover rotates and aligns with the cylinder body, it can avoid the phenomenon that the sealing gasket is distorted under the action of the upper cover, and reduce the phenomenon that gaps appear between the upper cover and the cylinder body due to the distortion of the sealing gasket, resulting in non-sealing.

[0010] To prevent the sealing gasket from detaching when installed on the first clamping strip and the second clamping strip, a first limiting rib that cooperates with the first limiting groove is provided along the circumferential direction on one side of the first clamping groove. When the sealing gasket moves upward under the action of an external force, the first limiting rib can play a limiting role.

[0011] To cooperate with the first limiting rib and prevent the sealing gasket from detaching from the outside, a second limiting groove is formed along the circumferential direction on the outer side surface of the second clamping strip, and a second limiting rib that cooperates with the second limiting groove is provided along the circumferential direction on one side of the second clamping groove.

[0012] To prevent the sealing gasket from rotating under the action of the upper cover rotating and aligning, a plurality of first notches arranged at intervals are formed in the first clamping strip, and a first blocking block located between adjacent first notches is provided in the first clamping groove.

[0013] To cooperate with the above-mentioned first notches and the first blocking blocks that can be clamped therein to prevent the sealing gasket from rotating, a plurality of second notches arranged at intervals are formed in the second clamping strip, and a second blocking block located between adjacent second notches is provided in the second clamping groove.

[0014] Regarding the specific structure of the above-mentioned first limiting rib, the first limiting rib has two outwardly convex side surfaces, including an adjacent first limiting surface and a second limiting surface. The first limiting surface is located above the second limiting surface and is inclined upward.

[0015] The structure of the first clamping strip is such that the central angle corresponding to the arc length of the arc-shaped surface of the first clamping strip is greater than π. The arc-shaped surface of the first clamping strip can increase the contact area with the sealing gasket, improve the friction force, and reduce the twisting deformation or rotation of the sealing gasket due to external forces.

[0016] The structure of the second clamping strip is such that the central angle corresponding to the arc length of the arc-shaped surface of the second clamping strip is greater than π, and the horizontal plane where the highest point of the first clamping strip is located is lower than the horizontal plane where the highest point of the second clamping strip is located. First, the inner part of the sealing gasket is clamped on the first clamping strip, and then the outer part of the sealing gasket is clamped on the second clamping strip, which is convenient for the step-by-step installation of the sealing gasket from the inside to the outside.

[0017] Regarding the installation positions of the first clamping strip and the second clamping strip, the vertical distance between the first clamping strip and the second clamping strip is greater than the vertical distance between the first clamping strip and the outer side surface of the cylinder body. This can not only seal the part of the upper end surface of the cylinder body close to the outside through the sealing gasket, but also seal the inner part of the upper end surface through the sealing gasket and the upper cover, forming a double-sealing effect with a certain interval and increasing the sealing area.

[0018] The beneficial effects of the present utility model are as follows:

[0019] The first clamping strip and the second clamping strip are both arranged on the upper end face of the cylinder body. Compared with only one clamping strip, it can not only increase the contact area and friction between the sealing gasket and the clamping strip, but also prevent the sealing gasket from being distorted and deformed under the action of the movement or rotation of the upper cover.

[0020] The first limiting rib on one side of the first clamping strip and the second limiting rib on one side of the second clamping strip can further contact the sealing gasket. The first limiting rib can fix the inner part of the sealing gasket. The first limiting surface of the first limiting rib is inclined upward, and the first limiting groove cooperating with the first limiting rib forms a clamping structure to prevent the sealing gasket from moving upward due to the acting force and falling off the first clamping strip.

[0021] The second limiting rib cooperates with the first limiting rib to limit the outer part of the sealing gasket, avoiding the outer part of the sealing gasket from detaching from the second limiting rib due to the upward external force. This is beneficial to enhancing the stability of the sealing gasket on the upper end face of the cylinder body, reducing the occurrence of distortion and deformation, and improving the service life and the sealing effect of the positive pressure filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the drawings:

[0023] Figure 1 is a schematic top view structure diagram;

[0024] Figure 2 is Figure 1 partial sectional view structure diagram in the A-A direction of

[0025] Figure 3 is Figure 2 enlarged structure diagram at A in

[0026] Figure 4 is Figure 3 enlarged structure diagram at B in

[0027] Figure 5 is Figure 4 structure diagram with the second clamping strip hidden in

[0028] Figure 6 is Figure 3 enlarged structure diagram at C in

[0029] Figure 7 is Figure 6 structure diagram with the first clamping strip hidden in

[0030] Figure 8 is a structure diagram of the first clamping strip and the second clamping strip;

[0031] Figure 9 is a bottom view of the sealing gasket;

[0032] Figure 10 For Figure 9 the enlarged structural schematic diagram at position D in

[0033] Figure 11 the partial three-dimensional structural schematic diagram of the first clamping strip and the second clamping strip;

[0034] The components represented by the reference numerals in the figure are:

[0035] 1. Upper cover; 2. Cylinder body; 3. Sealing gasket; 31. First clamping groove; 32. Second clamping groove; 33. First limiting rib; 331. First limiting surface; 332. Second limiting surface; 334. Bottom surface; 34. Second limiting rib; 35. First stop block; 36. Second stop block; 4. First clamping strip; 41. First limiting groove; 42. First notch; 43. Bottom surface; 5. Second clamping strip; 51. Second limiting groove; 52. Second notch. Specific embodiments

[0036] See Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown in

[0037] See Figure 9 and Figure 10 As shown, a top-opening and closing structure of a positive pressure filter is provided at the upper part of the positive pressure filter. The positive pressure filter includes an upper cover 1 and a cylinder body 2. A sealing gasket 3 is provided between the upper end surface of the cylinder body 2 and the upper cover 1. The upper end surface of the cylinder body 2 is provided with a first clamping strip 4 and a second clamping strip 5 with different inner diameters along its circumferential direction. The inner diameter of the first clamping strip 4 is smaller than that of the second clamping strip 5, and the inner diameter of the first clamping strip 4 is between the inner diameter of the cylinder body 2 and the inner diameter of the second clamping strip 5.

[0038] See Figure 4 , Figure 6 , Figure 8 and Figure 11As shown in the figure, regarding the structures of the first clamping strip 4 and the second clamping strip 5, the cross-sections of the first clamping strip 4 and the second clamping strip 5 are both arc-shaped surfaces. A first limiting groove 41 is provided along the circumferential direction on the inner side surface of the first clamping strip 4. To prevent the sealing gasket 3 from detaching when installed on the first clamping strip 4 and the second clamping strip 5, a first limiting rib 33 that cooperates with the first limiting groove 41 is provided along the circumferential direction on one side of the first clamping groove 31. The first limiting rib 33 can play a limiting role when the sealing gasket 3 moves upward due to an external force. To prevent the sealing gasket 3 from rotating under the action of the rotation and alignment of the upper cover 1, a plurality of first notches 42 arranged at intervals are provided on the first clamping strip 4 (see Figure 8 as shown). A first stop block 35 located between adjacent first notches 42 is provided in the first clamping groove 31. When the sealing gasket 3 is clamped on the first clamping strip 4, the first stop block 35 can be located between two adjacent first notches 42. At this time, the lower end surface of the first stop block 35 is lower than the upper end surface of the first clamping strip 4, playing a role in preventing the sealing gasket 3 from rotating.

[0039] Specifically, the first limiting rib 33 has two outwardly convex side surfaces, including an adjacent first limiting surface 331 and a second limiting surface 332. The first limiting surface 331 is located above the second limiting surface 332 and is inclined upward. The upper end of the second limiting surface 332 is connected to the outside of the first limiting surface 331, and the lower end of the second limiting surface 332 extends downward to the lower end surface of the sealing gasket 3. To facilitate the installation of the first limiting rib 33 in the first limiting groove 41, it is set that the lower end surface of the first limiting rib 33 is not flush with the bottom surface of the sealing gasket 3, and the cross-section of the lower end surface of the first limiting rib 33 gradually slopes upward from the outside to the inside, so that there is an installation gap between the lower end surface of the first limiting rib 33 and the upper end surface of the cylinder body 2, facilitating the elastic first limiting rib 33 to be pressed downward into the first limiting groove 41. The structure of the above-mentioned first clamping strip 4 is that the central angle corresponding to the arc length of the arc-shaped surface of the first clamping strip 4 is greater than π. The arc-shaped surface of the first clamping strip 4 can increase the contact area with the sealing gasket 3, improve the friction force, and reduce the distortion or rotation of the sealing gasket 3 due to an external force.

[0040] A second limiting groove 51 is provided along the circumferential direction on the outer side surface of the second clamping strip 5. A second limiting rib 34 that cooperates with the second limiting groove 51 is provided along the circumferential direction on one side of the second clamping groove 32. The second limiting rib 34 also has an outwardly convex third limiting surface and a fourth limiting surface. The third limiting surface is located above the fourth limiting surface and is inclined upward. There is also a gap reserved between the bottom surface of the second limiting rib 34 and the upper end surface of the cylinder body 2, facilitating the installation of the second limiting rib 34.

[0041] Regarding the installation positions of the first clamping strip 4 and the second clamping strip 5, the vertical distance between the first clamping strip 4 and the second clamping strip 5 is greater than the vertical distance between the first clamping strip 4 and the outer side surface of the cylinder body 2, which is convenient for the upper end surface of the cylinder body 2 where the first clamping strip 4 and the second clamping strip 5 are reasonably distributed. The central angle corresponding to the arc length of the arc surface of the second clamping strip 5 is greater than π, and the horizontal plane where the highest point of the first clamping strip 4 is located is lower than the horizontal plane where the highest point of the second clamping strip 5 is located. First, the inner part of the sealing gasket 3 is clamped on the first clamping strip 4, and then the outer part of the sealing gasket 3 is clamped on the second clamping strip 5, which is convenient for the step-by-step installation of the sealing gasket 3 from the inside to the outside. Moreover, the arc surface of the first clamping strip 4 is smaller, which can increase the thickness from the arc surface to the upper end surface of the sealing gasket 3, avoiding damage to the sealing gasket 3 caused by extrusion when the upper cover 1 is pressed down due to the relatively thin thickness of the sealing gasket 3 here, which affects the sealing. To cooperate with the above-mentioned first notch 42 and the first stopper 35 that can be clamped therein to prevent the sealing gasket 3 from rotating, the second clamping strip 5 is provided with a plurality of second notches 52 arranged at intervals (see Figure 8 shown). A second stopper 36 is provided in the second clamping groove 32 between adjacent second notches 52. When the sealing gasket 3 is clamped on the second clamping strip 5, the second stopper 36 can be located between two adjacent second notches 52. At this time, the lower end surface of the second notch 52 is lower than the upper end surface of the second clamping strip 5, playing a role in preventing the sealing gasket 3 from rotating.

[0042] The above-mentioned sealing gasket 3, first limiting rib 33, second limiting rib 34, first stopper 35 and second stopper 36 are integrally formed, and their material is rubber material.

Claims

1. An upper opening and closing structure of a positive pressure filter, arranged at the upper part of the positive pressure filter, the positive pressure filter comprising an upper cover (1) and a cylinder (2), characterized in that: A sealing gasket (3) is provided between the upper end surface of the cylinder (2) and the upper cover (1); a first clamping strip (4) and a second clamping strip (5) having different inner diameters are provided on the upper end surface of the cylinder (2) along its circumferential direction; the inner diameter of the first clamping strip (4) is located between the inner diameter of the cylinder (2) and the inner diameter of the second clamping strip (5); The cross-sections of the first clamping strip (4) and the second clamping strip (5) are both arc-shaped surfaces, and the inner side surface of the first clamping strip (4) is provided with a first limiting groove (41) along its circumferential direction; The lower end surface of the sealing gasket (3) is provided with a first clamping groove (31) matched with the first clamping strip (4) and a second clamping groove (32) matched with the second clamping strip (5).

2. The upper opening and closing structure of a positive pressure filter according to claim 1, characterized in that: One side of the first clamping groove (31) is provided with a first limiting convex strip (33) along its circumferential direction and matched with the first limiting groove (41).

3. The upper opening and closing structure of a positive pressure filter according to claim 2, characterized in that: The outer side surface of the second clamping strip (5) is provided with a second limiting groove (51) along its circumferential direction, and one side of the second clamping groove (32) is provided with a second limiting convex strip (34) matching with the second limiting groove (51) along its circumferential direction.

4. The upper opening and closing structure of a positive pressure filter according to claim 1, characterized in that: The first clamping strip (4) is provided with a plurality of first notches (42) arranged at intervals, and the first clamping groove (31) is provided with a first stopper (35) located between adjacent first notches (42).

5. The upper opening and closing structure of the positive pressure filter according to claim 4, characterized in that: The second clamping strip (5) is provided with a plurality of second notches (52) arranged at intervals, and the second clamping groove (32) is provided with a second stopper (36) located between adjacent second notches (52).

6. The upper opening and closing structure of a positive pressure filter according to claim 2, characterized in that: The first limiting convex strip (33) has two outwardly convex side surfaces, including a first limiting surface (331) and a second limiting surface (332) adjacent to each other, wherein the first limiting surface (331) is located above the second limiting surface (332) and is arranged to be inclined upward.

7. The upper opening and closing structure of a positive pressure filter according to claim 1, characterized in that: The central angle corresponding to the arc length of the arc-shaped surface of the first clamping strip (4) is greater than π.

8. The upper opening and closing structure of the positive pressure filter according to claim 7, characterized in that: The central angle corresponding to the arc length of the arc-shaped surface of the second clamping strip (5) is greater than π, and the horizontal plane where the highest point of the first clamping strip (4) is located is lower than the horizontal plane where the highest point of the second clamping strip (5) is located.

9. The upper opening and closing structure of a positive pressure filter according to claim 1, characterized in that: The vertical distance between the first clamping strip (4) and the second clamping strip (5) is greater than the vertical distance between the first clamping strip (4) and the outer side surface of the cylinder (2).

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