Check valve core and nebulizer

Abstract

The application provides a check valve core and a sprayer. The check valve core has an upper end surface, a lower end surface, a cylindrical surface and a sealing surface surrounding the central axis of the cylindrical surface. The upper end of the cylindrical surface is connected with the upper end surface. The sealing surface is connected between the lower end of the cylindrical surface and the lower end surface. The check valve core is provided with an upper groove and a notch groove. The upper groove is recessed downward from the upper end surface. The upper groove has a groove bottom wall and a groove outer wall surrounding the groove bottom wall. The notch groove is recessed downward from the upper end surface. The notch groove penetrates the cylindrical surface to the groove outer wall. The recessed depth of the notch groove is smaller than the recessed depth of the upper groove. When the check valve core is applied to the sprayer, the liquid storage efficiency of the liquid storage bin of the sprayer can be improved. Rapid downward movement can be realized to achieve sealing. The accuracy of the spraying amount of the sprayer can be ensured. The response speed of the spraying can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a check valve core and a nebulizer. BACKGROUND

[0002] To avoid the liquid entering the nebulizer from flowing back into the fluid bottle, a check valve needs to be set. The sealing effect and the closing speed of the check valve are related to the accuracy of the nebulizer spray amount. Therefore, how to improve the sealing effect and the closing speed of the check valve is a technical problem to be solved by those skilled in the art. SUMMARY

[0003] To solve the above technical problem, the present application provides a check valve core, which has an upper end face, a lower end face, a cylindrical surface, and a sealing surface surrounding the central axis of the cylindrical surface. The upper end of the cylindrical surface is connected to the upper end face, and the sealing surface is connected between the lower end of the cylindrical surface and the lower end face. The check valve core is provided with an upper groove and a notch groove. The upper groove is recessed downward from the upper end face. The upper groove has a groove bottom wall and a groove outer wall surrounding the groove bottom wall. The notch groove is recessed downward from the upper end face. The notch groove penetrates the cylindrical surface to the groove outer wall. The recessed depth of the notch groove is less than the recessed depth of the upper groove.

[0004] In an optional embodiment of the check valve core, the recessed depth of the notch groove is not less than 0.2 mm.

[0005] In an optional embodiment of the check valve core, the cross-sectional shape of the sealing surface is an outwardly convex arc.

[0006] In an optional embodiment of the check valve core, the area of the sealing surface except the upper end is located inside the cylindrical surface.

[0007] In an optional embodiment of the check valve core, at least part of the area of the sealing surface is located outside the cylindrical surface.

[0008] In an optional embodiment of the check valve core, the cylindrical surface has an upper cylindrical surface and a lower cylindrical surface. The lower cylindrical surface is located outside the upper cylindrical surface. A step surface is formed between the lower cylindrical surface and the upper cylindrical surface. The step surface is perpendicular to the upper cylindrical surface and the lower cylindrical surface.

[0009] In an optional embodiment of the check valve core, a flow guide surface is connected between the inside of the step surface and the lower end of the upper cylindrical surface. The diameter of the flow guide surface is larger as it is closer to the step surface.

[0010] In an optional embodiment of the check valve core, the check valve core has elasticity. The check valve core is provided with a lower groove, which is recessed upward from the lower end face.

[0011] An optional embodiment of the check valve core, at least one side of the cylindrical surface is provided with a flat surface.

[0012] An optional embodiment of the check valve core, the flat surface and the notch groove are located on the same side of the check valve core.

[0013] An optional embodiment of the check valve core, the outer wall of the upper groove comprises an upper groove wall and a lower groove wall, the upper groove wall is located outside the lower groove wall, an ejection wall is formed between the upper groove wall and the lower groove wall, the notch groove penetrates from the cylindrical surface to the upper groove wall, and the ejection wall is located below the notch groove and the upper end surface.

[0014] The application also provides a sprayer, which comprises the check valve core, the pipe, the pump body, the nozzle, and the lifting element capable of being lifted relative to the pump body, the check valve core is assembled inside the pipe, the nozzle is assembled inside the pump body, the pump body is provided with a liquid storage bin inside, the nozzle is in communication with the liquid storage bin, the pipe is provided with a tapered surface inside, the check valve core is located above the tapered surface, the sealing surface of the check valve core can be in contact with the tapered surface to achieve sealing, the pipe is provided with a liquid outlet above the tapered surface and a liquid inlet below the tapered surface, the liquid outlet is in communication with the liquid storage bin, and the pipe can be lifted with the lifting element.

[0015] The check valve core provided by the application can make the fluid enter the upper groove and overflow from the upper groove to the liquid outlet of the pipe through the notch groove after flowing through the gap between the check valve core and the inner side surface of the pipe, the existence of the notch groove and the overflow effect generated by the cooperation of the upper groove and the notch groove can reduce the resistance of the fluid flowing to the liquid outlet, thereby improving the liquid storage efficiency of the liquid storage bin. Since the upper groove is provided and the recess depth of the upper groove is greater than the recess depth of the notch groove, the downward pressure of the fluid on the check valve core when the pipe rises is increased, so that the check valve core can quickly move downward to achieve sealing when the pipe rises, which not only helps to ensure the accuracy of the spraying amount, but also helps to improve the response speed of the spraying, and almost starts to spray at the moment when the pipe rises. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A sectional view of part of an embodiment of the sprayer provided by the application;

[0017] Figure 2 A front view of the first embodiment of the check valve core provided by the application;

[0018] Figure 3 A sectional view of Figure 2 ; and

[0019] Figure 4 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the open state; Figure 1

[0020] Figure 5 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the closed state; Figure 1

[0021] Figure 6 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the closed state;

[0022] Figure 7 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the closed state; Figure 6

[0023] Figure 8 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the closed state;

[0024] Figure 9 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the closed state; Figure 8

[0025] Figure 10 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the closed state;

[0026] Figure 11 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the closed state; Figure 10

[0027] Figure 12 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the closed state;

[0028] Figure 13 As shown in the sectional view of the check valve core installed inside the pipe fitting and in the closed state; Figure 12

[0029] The reference signs are explained as follows:

[0030] 1 check valve core, 11 upper end face, 12 lower end face, 13 cylindrical face, 14 sealing face, 15 upper cylindrical face, 16 lower cylindrical face, 17 stepped face, 18 flow guiding face, 19 arc-shaped flow guiding face, 110 first inclined flow guiding face, 111 second inclined flow guiding face, 112 tangent plane, A upper groove, A1 groove outer wall, A11 upper groove wall, A12 lower groove wall, A13 ejection wall, A2 groove bottom wall, B notched groove, C lower groove;

[0031] 2 pipe fitting, 21 conical face, 22 liquid outlet, 23 liquid inlet, 24 stopper flange;

[0032] 3 pump body, 31 liquid storage chamber; 4 nozzle; 5 lifting member. DETAILED DESCRIPTION

[0033] ​​​​​​The application provides a check valve core and a sprayer. In order to make the skilled in the art better understand the technical scheme of the application, the technical scheme of the application is further described in detail below in combination with the drawings and specific embodiments.

[0034] As shown in Figure 1 , the application provides a sprayer which at least comprises a check valve core 1, a pipe 2, a pump body 3, a spray head 4 and a lifting piece 5.

[0035] As shown in Figure 5 , the check valve core 1 is assembled inside the pipe 2. There is a radial gap between the check valve core 1 and the inner side of the pipe 2, and the radial gap is preferably 0.01mm-0.3mm, more preferably 0.01mm-0.1mm.

[0036] The pipe 2 is internally provided with a tapered surface 21. The pipe 2 is internally provided with a liquid inlet 23 below the tapered surface 21 and a liquid outlet 22 above the tapered surface 21. The check valve core 1 is located above the tapered surface 21 and can be in contact with the tapered surface 21 to achieve sealing and can be separated from the tapered surface 21 to achieve opening.

[0037] The pump body 3 is provided with a liquid storage bin 31, the spray head 4 is assembled inside the pump body 3, and the spray head 4 is in communication with the liquid storage bin 31. The liquid outlet 22 of the pipe 2 is in communication with the liquid storage bin 31.

[0038] The lifting piece 5 can be lifted up and down, and the lifting piece 5 is connected with the pipe 2, so that the pipe 2 can be lifted up and down with the lifting piece 5. Specifically, the lifting piece 5 and the pipe 2 can be integrally formed, so that the step of connecting the lifting piece 5 and the pipe 2 can be omitted when assembling. When the pipe 2 rises, the check valve core 1 moves downward under the action of the fluid pressure in the liquid storage bin 31 and contacts the tapered surface 21 to achieve sealing. At this time, the fluid in the liquid storage bin 31 is extruded and sprayed from the spray head 4. After the pipe 2 rises to the limit position, the lifting piece 5 is driven to descend, and the pipe 2 descends accordingly, resulting in negative pressure in the liquid storage bin 31. Under the action of the negative pressure, the check valve core 1 moves upward and separates from the tapered surface 21, so that a gap is formed between the check valve core 1 and the tapered surface 21. At this time, the fluid coming from the liquid inlet 23 flows through the gap between the check valve core 1 and the tapered surface 21 and the radial gap between the check valve core 1 and the inner side of the pipe 2 to the liquid outlet 22, and finally flows from the liquid outlet 22 to the liquid storage bin 31, so as to store liquid in the liquid storage bin 31 for the next spraying.

[0039] The upper end of the pipe 2 can be provided with a stop flange 24, and the check valve core 1 is assembled inside the pipe 2 and located between the stop flange 24 and the tapered surface 21. When the check valve core 1 moves upward to the limit position, it abuts against the stop flange 24, and the stop flange 24 provides an upper stop point for the check valve core 1.

[0040] As shown in Figure 2 and Figure 3As shown, the check valve core 1 provided by the present application has an upper end face 11, a lower end face 12, a cylindrical surface 13 and a sealing surface 14. The upper end of the cylindrical surface 13 is connected with the upper end face 11, and the sealing surface 14 is connected between the lower end of the cylindrical surface 13 and the lower end face 12, and the sealing surface 14 surrounds the central axis of the cylindrical surface 13. The cylindrical surface 13 is perpendicular or substantially perpendicular to the upper end face 11 and the lower end face 12.

[0041] The check valve core 1 provided by the present application is provided with an upper groove A and a notch groove B. The upper groove A is recessed downward from the upper end face 11. The upper groove A has a groove bottom wall A2 and a groove outer wall A1 which is arranged outside the groove bottom wall A2. The notch groove B is recessed downward from the upper end face 11, and the notch groove B penetrates through the cylindrical surface 13 to the groove outer wall A1. The recessed depth (H1 in the figure) of the notch groove B is smaller than the recessed depth (H2 in the figure) of the upper groove A. The recessed depth of the notch groove B is preferably not less than 0.2 mm.

[0042] It should be noted that in the description of the check valve core 1 provided by the present application, the side along the radial direction of the cylindrical surface 13 which is relatively close to the central axis of the cylindrical surface 13 is referred to as the inner side, and the side along the radial direction of the cylindrical surface 13 which is relatively far away from the central axis of the cylindrical surface 13 is referred to as the outer side.

[0043] As shown in Figure 4 and Figure 5 When the check valve core 1 moves upward to the limit position, the check valve core 1 is in contact with the stop flange 24 of the valve piece, and when the check valve core 1 moves downward to the limit position, the sealing surface 14 of the check valve core 1 is in contact with the conical surface 21.

[0044] The check valve core 1 described above, due to the provision of the notch groove B and the recessed depth of the notch groove B being smaller than the recessed depth of the upper groove A, fluid flowing through the radial gap between the check valve core 1 and the inner side of the pipe piece 2 can enter the upper groove A and overflow from the upper groove A to the outlet 22 of the pipe piece 2 through the notch groove B. The existence of the notch groove B and the overflow effect generated by the cooperation of the upper groove A and the notch groove B reduce the resistance of the fluid flowing to the outlet 22, thus improving the liquid storage efficiency of the liquid storage chamber 31.

[0045] The check valve core 1 described above, due to the provision of the upper groove A and the recessed depth of the upper groove A being greater than the recessed depth of the notch groove B, increases the downward pressure on the check valve core 1 from the fluid when the pipe piece 2 rises, thus enabling the check valve core 1 to move downward more quickly to achieve sealing when the pipe piece 2 rises. This not only helps to ensure the accuracy of the injection amount, but also helps to improve the response speed of the injection, which can almost start to inject at the moment when the pipe piece 2 rises.

[0046] In some embodiments, the cross-sectional shape of the sealing surface 14 is an outwardly convex arc. In this way, the sealing surface 14 can better contact the conical surface 21 to achieve sealing.

[0047] In some embodiments, the check valve core 1 is elastic, so that when the check valve core 1 is in contact with the conical surface 21, the check valve core 1 can be elastically deformed, which is conducive to increasing the contact area between the check valve core 1 and the conical surface 21, thereby facilitating the sealing effect. Specifically, the check valve core 1 can be made of a material with a certain elasticity, such as polypropylene (PP) material.

[0048] In some embodiments, the check valve core 1 is provided with a lower groove C. The lower groove C is recessed upward from the lower end surface 12. When the check valve core 1 is elastic, the lower groove C can provide the check valve core 1 with a larger deformation space, so that when the check valve core 1 is in contact with the conical surface 21, the check valve core 1 can be deformed to a greater extent within a reasonable range, thereby being able to contact the conical surface 21 with a larger area, thereby facilitating the sealing effect.

[0049] In some embodiments, at least one side of the cylindrical surface 13 is provided with a cut plane 112 (see Figures 10-13 The cut plane 112 is similar to a plane formed by cutting a portion of the cylindrical surface 13 in the axial direction. By providing the cut plane 112, at least one side of the cylindrical surface 13 is formed with a notch, which can serve as a glue inlet when the check valve core 1 is molded with a mold, facilitating the molding of the check valve core 1, and avoiding the formation of burrs on the molded cylindrical surface 13, thereby increasing the resistance of the fluid flowing along the cylindrical surface 13.

[0050] In some embodiments, the outer wall A1 of the upper groove A includes an upper groove wall A11 and a lower groove wall A12 (see Figure 10 and Figure 12 The upper groove wall A11 is located outside the lower groove wall A12, and the upper groove wall A11 and the lower groove wall A12 form an ejection wall A13 therebetween. The notch groove B extends from the cylindrical surface 13 to the upper groove wall A11, and the ejection wall A13 is located below the notch groove B and the upper end surface 11, that is, the ejection wall A13 is lower than the notch groove B and the upper end surface 11. In this way, when the check valve core 1 is molded with a mold, the mold can be demolded against the ejection wall A13. In this way, burrs are avoided on the upper end surface 11 and the groove wall of the notch groove B, thereby affecting the accuracy of the injection amount.

[0051] The above-mentioned embodiments can be freely combined without conflict.

[0052] Specifically, as shown in Figure 3 In the first embodiment shown in the figure, the area of the sealing surface 14 other than the upper end is located inside the cylindrical surface 13, that is, the sealing surface 14 does not extend to the outside of the cylindrical surface 13. More specifically, in this embodiment, the upper end of the sealing surface 14 is tangent to the lower end of the cylindrical surface 13, and the lower end of the sealing surface 14 is tangent to the lower end surface 12. Alternatively, the upper end of the sealing surface 14 can intersect the lower end of the cylindrical surface 13, and the lower end of the sealing surface 14 can intersect the lower end surface 12.

[0053] Specifically, such as Figure 6 As shown in the figure, one difference between the second embodiment and the first embodiment described above is that at least a portion of the sealing surface 14 is located outside the cylindrical surface 13. More specifically, in this embodiment, the upper end of the sealing surface 14 intersects with the lower end of the cylindrical surface 13, and the lower end of the sealing surface 14 is tangent to the lower end surface 12. Alternatively, the lower end of the sealing surface 14 may intersect with the lower end surface 12. By having at least a portion of the sealing surface 14 located outside the cylindrical surface 13, a protrusion can be formed on the outer side of the check valve core 1. Some of the fluid in the reservoir 31 flows into the radial gap between the check valve core 1 and the inner side of the pipe fitting 2, generating a downward force on the protrusion on the outer side of the check valve core 1. This increases the downward pressure on the check valve core 1, thus accelerating the downward sealing speed of the check valve core 1 and increasing the contact force between the check valve core 1 and the conical surface 21, thereby improving the sealing effect.

[0054] Specifically, in the radial direction of the cylindrical surface 13, the maximum distance between the area of ​​the sealing surface 14 located outside the cylindrical surface 13 and one side of the cylindrical surface 13 (S1 in the figure) is preferably 0.1mm ≤ S1 ≤ 0.5mm, more preferably 0.1mm ≤ S1 ≤ 0.3mm. That is to say, S1 refers to the radial distance along the radial direction of the cylindrical surface 13. Controlling S1 within the range of 0.1mm-0.5mm facilitates the molding of the check valve core 1 and avoids the problem of the protrusion being too high, which would easily cause it to bend under stress.

[0055] Specifically, such as Figure 8 and Figure 9 As shown in the figure, the third embodiment also forms a protrusion on the outside of the check valve core 1, which can accelerate the downward sealing speed of the check valve core 1 and improve the sealing effect. However, the way the protrusion is formed in this embodiment is different from the second embodiment described above: In this embodiment, the cylindrical surface 13 includes an upper cylindrical surface 15 and a lower cylindrical surface 16, with the lower cylindrical surface 16 located outside the upper cylindrical surface 15. A stepped surface 17 is formed between the lower cylindrical surface 16 and the upper cylindrical surface 15, and the stepped surface 17 is perpendicular to or approximately perpendicular to the upper cylindrical surface 15 and the lower cylindrical surface 16. When the pipe 2 rises, the fluid impacts the stepped surface 17 downwards, and the impact force can accelerate the downward sealing speed of the check valve core 1 and improve the sealing effect of the check valve core 1. In addition, in this embodiment, the lower groove C can be omitted to avoid excessive deformation of the sealing surface 14 of the check valve core 1 caused by the impact force acting on the stepped surface 17.

[0056] Specifically, in the radial direction of the cylindrical surface 13, the single-side distance (S2 in the figure) between the lower cylindrical surface 16 and the upper cylindrical surface 15 is preferably 0.1 mm≤S2≤0.5 mm, more preferably 0.1 mm≤S2≤0.3 mm. That is, S2 refers to the radial distance in the radial direction of the cylindrical surface 13. Controlling S2 in the range of 0.1 mm-0.5 mm can facilitate the molding of the check valve element 1 and avoid the problem that the protruding portion is too high and is prone to bending when subjected to force.

[0057] Specifically, as shown in Figure 10 and Figure 11 , the fourth embodiment shown in the figure differs from the third embodiment described above in that in the present embodiment, one cutting plane 112 is arranged on each of the opposite sides of the upper cylindrical surface 15, and the distance between the two cutting planes 112 is less than the diameter of the upper cylindrical surface 15. Meanwhile, one notch groove B is arranged on each of the two sides of the upper cylindrical surface 15, so that the cutting plane 112 and the notch groove B are located on the same side of the check valve element 1. In the present embodiment, an ejection wall A13 is also arranged, and when the check valve element 1 is molded by a mold, the ejection wall A13 can be used for ejection, so that the burr formed on the upper end surface 11 and the groove wall of the notch groove B can be avoided, and the accuracy of the injection amount can be ensured.

[0058] As shown in Figure 12 and Figure 13 , the fifth embodiment shown in the figure differs from the fourth embodiment described above in that a flow guide surface 18 is connected between the inner side of the step surface 17 and the lower end of the upper cylindrical surface 15, and the diameter of the flow guide surface 18 becomes larger as it approaches the step surface. In this way, the fluid entering the radial gap between the check valve element 1 and the inner side surface of the pipe 2 from the liquid storage chamber 31 collides with the step surface 17 after passing through the flow guide surface 18 along the cylindrical surface 13 of the check valve element 1, so that the impact force borne by the step surface 17 is moderate and does not cause excessive deformation of the sealing surface 14, thereby ensuring the sealing effect.

[0059] Specifically, the flow guide surface 18 can include an arc-shaped flow guide surface 19 with an arc cross-sectional shape and / or an inclined flow guide surface with an inclined cross-sectional shape. As shown in Figure 12 and Figure 13 , in the present embodiment, the second inclined flow guide surface 111, the first inclined flow guide surface 110, and the arc-shaped flow guide surface 19 are arranged in sequence from top to bottom, and the slope of the second inclined flow guide surface 111 is greater than the slope of the first inclined flow guide surface 110.

[0060] The above describes the principles and implementation modes of the present application by using specific examples, and the above embodiment is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A check valve spool, characterized by, The check valve core (1) has an upper end face (11), a lower end face (12), a cylindrical surface (13), and a sealing surface (14) surrounding the central axis of the cylindrical surface (13) for one turn, the upper end of the cylindrical surface (13) is connected with the upper end face (11), the sealing surface (14) is connected between the lower end of the cylindrical surface (13) and the lower end face (12), the check valve core (1) is provided with an upper groove (A) and a notch groove (B), the upper groove (A) is recessed downward from the upper end face (11), the upper groove (A) has a groove bottom wall (A2) and a groove outer wall (A1) surrounding the groove bottom wall (A2), the notch groove (B) is recessed downward from the upper end face (11), the notch groove (B) penetrates through the cylindrical surface (13) to the groove outer wall (A1), and the recessed depth of the notch groove (B) is smaller than the recessed depth of the upper groove (A).

2. The check valve element of claim 1, wherein The recessed depth of the notch groove (B) is not less than 0.2 mm.

3. The check valve element of claim 1, wherein The cross-sectional shape of the sealing surface (14) is an outwardly convex arc.

4. The check valve element of claim 1, wherein The area of the sealing surface (14) except the upper end is located inside the cylindrical surface (13).

5. The check valve element of claim 1, wherein At least part of the area of the sealing surface (14) is located outside the cylindrical surface (13).

6. The check valve element of claim 1, wherein The cylindrical surface (13) has an upper cylindrical surface (15) and a lower cylindrical surface (16), the lower cylindrical surface (16) is located outside the upper cylindrical surface (15), a stepped surface (17) is formed between the lower cylindrical surface (16) and the upper cylindrical surface (15), and the stepped surface (17) is perpendicular to the upper cylindrical surface (15) and the lower cylindrical surface (16).

7. The check valve element of claim 6, wherein A flow guide surface (18) is connected between the inside of the stepped surface (17) and the lower end of the upper cylindrical surface (15), and the diameter of the flow guide surface (18) becomes larger as it is closer to the stepped surface (17).

8. The check valve element of any one of claims 1-7, wherein, The check valve core (1) has elasticity, and the check valve core (1) is provided with a lower groove (C) recessed upward from the lower end face (12).

9. The check valve element of any one of claims 1-7, wherein, At least one side of the cylindrical surface (13) is provided with a tangent plane (112).

10. The check valve element of claim 9, wherein, The tangent plane (112) and the notch groove (B) are located on the same side of the check valve core (1).

11. The check valve element of any one of claims 1-7, wherein, The groove outer wall (A1) of the upper groove (A) includes an upper groove wall (A11) and a lower groove wall (A12), the upper groove wall (A11) is located outside the lower groove wall (A12), an ejection wall (A13) is formed between the upper groove wall (A11) and the lower groove wall (A12), the notch groove (B) penetrates through the cylindrical surface (13) to the upper groove wall (A11), and the ejection wall (A13) is located below the notch groove (B) and the upper end face (11).

12. A nebulizer characterized by The sprayer comprises the check valve core (1) of any one of claims 1-11, a pipe (2), a pump body (3), a spray head (4), and a lifting piece (5) capable of lifting relative to the pump body (3), the check valve core (1) is assembled inside the pipe (2), the spray head (4) is assembled inside the pump body (3), the pump body (3) is internally provided with a liquid storage bin (31), the spray head (4) is in communication with the liquid storage bin (31), the pipe (2) is internally provided with a tapered surface (21), the check valve core (1) is located above the tapered surface (21), the sealing surface (14) of the check valve core (1) can be in contact with the tapered surface (21) to achieve sealing, the pipe (2) is provided with a liquid outlet (22) above the tapered surface (21) and a liquid inlet (23) below the tapered surface (21), the liquid outlet (22) is in communication with the liquid storage bin (31), and the pipe (2) can be lifted with the lifting piece (5).

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