Non-metal high-air-tightness movable sleeve

Abstract

The nonmetal high-air-tightness movable sleeve comprises an outer sleeve, a sealing groove and a communicating hole are formed in the outer sleeve, a groove opening of the sealing groove is located in the inner wall of the outer sleeve, and the communicating hole communicates with the sealing groove and the outer wall of the outer sleeve; the sealing ring is embedded in the sealing groove; the inner sliding rod penetrates through the inner side of the outer sleeve in a sliding manner; and the air pressure ring is arranged on the outer sleeve in a sleeving mode, a working air groove is formed in the inner side of the air pressure ring, the working air groove communicates with the communicating hole, and the working air groove is used for being connected with an external air source so that the close-fitting degree between the sealing ring and the inner sliding rod can be changed through air pressure changes. On the premise that the high air tightness of the movable sleeve bag is kept, the movable sleeve is convenient to assemble and disassemble for maintenance treatment.

Description

Technical Field

[0001] The present application relates to the field of movable sealing devices, and in particular to a non-metallic high-airtightness movable sleeve. Background Art

[0002] With the rapid development of modern medical technology, the precision, stability and reliability requirements of medical equipment are becoming increasingly higher. As a key component, non-metallic high-airtightness movable sleeves are increasingly used in medical equipment.

[0003] In the related art, the non-metallic high-airtightness movable sleeve includes an outer sleeve, an inner slide rod and a sealing ring. The inner slide rod slides through the inner side of the outer sleeve, and the sealing ring is located between the outer sleeve and the inner slide rod, thereby achieving sealing between the outer sleeve and the inner slide rod.

[0004] Regarding the above-mentioned related technologies, there is a defect that the sealing is improved only by using a sealing ring, which makes it difficult to install and disassemble the outer sleeve and the inner slide rod, thereby making it difficult to repair the movable sleeve. Summary of the Invention

[0005] In order to facilitate assembly and disassembly of the movable sleeve for maintenance while maintaining high air tightness of the movable sleeve bag, the present application provides a non-metallic high air tightness movable sleeve.

[0006] The present application provides a non-metallic high airtightness movable sleeve adopting the following technical solution:

[0007] A non-metallic high airtightness movable sleeve, comprising:

[0008] The outer sleeve is provided with a sealing groove and a communicating hole, wherein the notch of the sealing groove is located on the inner wall of the outer sleeve, and the communicating hole communicates with the sealing groove and the outer wall of the outer sleeve;

[0009] A sealing ring, embedded in the sealing groove;

[0010] An inner sliding rod is slidably arranged on the inner side of the outer sleeve;

[0011] A pneumatic ring is sleeved on the outer sleeve, and a working air groove is provided on the inner side of the pneumatic ring. The working air groove is connected to the connecting hole. The working air groove is used to connect to an external air source and change the tightness between the sealing ring and the inner sliding rod through changes in air pressure.

[0012] By adopting the above technical solution, during assembly or disassembly, the external air source need not pressurize the working air tank, thereby weakening the tight fit between the inner slide rod and the sealing ring. This makes assembly and disassembly between the inner slide rod and the outer sleeve more convenient, thereby making the movable sleeve easier to repair and handle. During use, the air pressure in the working air tank can be adjusted according to actual working conditions. For example, when telescoping is required, the air pressure in the working air tank can be lowered to weaken the tight fit between the inner slide rod and the sealing ring. When telescoping is not required, the air pressure in the working air tank can be increased to strengthen the tight fit between the inner slide rod and the sealing ring, thereby maintaining a high airtightness between the inner slide rod and the outer sleeve.

[0013] Preferably, a guide block is provided on the outer wall of the sealing ring, and the guide block is passed through the communicating hole.

[0014] By adopting the above technical solution, due to the setting of the guide block, the deformation direction of the sealing ring can be made more parallel to the diameter direction of the sealing ring, so that the air pressure change in the working air groove can smoothly change the tightness between the sealing ring and the inner slide rod.

[0015] Preferably, the deformation capacity of the guide block is smaller than the deformation capacity of the sealing ring.

[0016] By adopting the above technical solution, the air pressure in the working air groove can be better transmitted to the sealing ring through the guide block, so that the air pressure can fully act on the sealing ring to maintain the smoothness of the sealing ring's deformation.

[0017] Preferably, an auxiliary ring is provided at one end of the guide block away from the sealing ring, and the auxiliary ring is used to be penetrated by an installation tool.

[0018] By adopting the above technical solution, due to the provision of the auxiliary ring, the auxiliary ring can be hooked by a hook during installation to facilitate inserting the guide block into the communicating hole, thereby making the movable sleeve easier to assemble and disassemble.

[0019] Preferably, the inner diameter of the sealing ring is larger than the outer diameter of the inner sliding rod.

[0020] By adopting the above technical solution, when the external air source does not pressurize the working air tank, the sealing ring and the inner slide rod are in clearance fit, so the assembly and disassembly between the inner slide rod and the outer sleeve are more convenient.

[0021] Preferably, the inner wall of the sealing ring is provided with a plurality of closing grooves, and the plurality of closing grooves are evenly distributed around the center of the sealing ring. When the sealing ring abuts against the inner sliding rod, the two opposite side walls of the closing grooves abut against each other.

[0022] By adopting the above technical solution, when the working gas groove is pressurized, the closing groove can be closed so that the inner circumference of the sealing ring can be reduced while the inner diameter is reduced. This can facilitate assembly and disassembly between the inner slide rod and the outer sleeve, while allowing the sealing ring and the inner slide rod to maintain a tight fit and abutment, thereby maintaining high air tightness between the inner slide rod and the outer sleeve.

[0023] Preferably, the cross section of the closed through groove perpendicular to its own length direction is triangular.

[0024] By adopting the above technical solution, when the working gas tank is pressurized, the closing groove can be closed more fully to further improve the tight fit between the sealing ring and the inner slide rod, thereby improving the high air tightness between the inner slide rod and the outer sleeve.

[0025] Preferably, a plurality of the sealing rings are spaced apart and distributed along the length direction of the outer sleeve, and the closing grooves between two adjacent sealing rings are staggered.

[0026] By adopting the above technical solution, the multiple closing through grooves can be distributed in a bending path along the axis direction of the outer sleeve, so the defect of reduced airtightness caused by the provision of the closing through grooves can be compensated.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. During assembly or disassembly, the external air source does not need to pressurize the working air tank to weaken the tight fit between the inner slide rod and the sealing ring. This makes assembly and disassembly between the inner slide rod and the outer sleeve more convenient, making the movable sleeve easier to repair. During use, the air pressure in the working air tank can be adjusted according to the actual working conditions. For example, when the extension is required, the air pressure in the working air tank can be lowered to weaken the tight fit between the inner slide rod and the sealing ring. When the extension is not required, the air pressure in the working air tank can be increased to strengthen the tight fit between the inner slide rod and the sealing ring, thereby maintaining high air tightness between the inner slide rod and the outer sleeve.

[0029] 2. When the external air source does not pressurize the working air tank, there is a clearance fit between the sealing ring and the inner slide bar, so the assembly and disassembly between the inner slide bar and the outer sleeve are more convenient;

[0030] 3. When the working gas tank is pressurized, the closing groove can be closed so that the inner circumference of the sealing ring can be reduced while the inner diameter is reduced. This can facilitate assembly and disassembly between the inner slide rod and the outer sleeve, while allowing the sealing ring and the inner slide rod to maintain a tight fit and maintain high air tightness between the inner slide rod and the outer sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a structural schematic diagram of the non-metallic high airtightness movable sleeve in an embodiment of the present application.

[0032] Figure 2 It is a cross-sectional schematic diagram of the non-metallic high airtightness movable sleeve in the embodiment of the present application.

[0033] Figure 3 This is a schematic diagram used to illustrate the arrangement and coordination structure between multiple sealing rings in an embodiment of the present application.

[0034] Explanation of the reference numerals: 1. outer sleeve; 11. sealing groove; 12. communicating hole; 2. sealing ring; 21. guide block; 22. auxiliary ring; 23. closing groove; 3. inner slide rod; 4. air pressure ring; 41. working air groove. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-3 This application is described in further detail.

[0036] The embodiment of the present application discloses a non-metallic high airtightness movable sleeve.

[0037] Reference Figure 1 and Figure 2 The non-metallic high-airtightness movable sleeve includes an outer sleeve 1, a sealing ring 2, an inner sliding rod 3 and a pneumatic ring 4. The outer sleeve 1 is provided with a sealing groove 11 and a communicating hole 12. The notch of the sealing groove 11 is located on the inner wall of the outer sleeve 1, and the communicating hole 12 connects the sealing groove 11 and the outer wall of the outer sleeve 1. A plurality of communicating holes 12 are evenly distributed in a circle around the center of the outer sleeve 1; the sealing ring 2 is embedded in the sealing groove 11, and one sealing groove 11 is matched with one sealing ring 2; the inner sliding rod 3 is coaxially slidably penetrated on the inner side of the outer sleeve 1; the pneumatic ring 4 is coaxially fixedly sleeved on the outer sleeve 1, and a working air groove 41 is provided on the inner side of the pneumatic ring 4. The working air groove 41 is connected to the communicating hole 12, and the working air groove 41 is also connected to an external air source, so the degree of tightness between the sealing ring 2 and the inner sliding rod 3 can be changed by changing the air pressure.

[0038] Reference Figure 1 and Figure 2 During assembly or disassembly, the external air source does not need to pressurize the working air groove 41 to weaken the tight fit between the inner slide bar 3 and the sealing ring 2. This makes assembly and disassembly between the inner slide bar 3 and the outer sleeve 1 more convenient, making the movable sleeve easier to repair. During use, the air pressure in the working air groove 41 can be lowered according to actual working conditions. For example, when telescoping is required, the air pressure in the working air groove 41 can be increased to strengthen the tight fit between the inner slide bar 3 and the sealing ring 2, while when telescoping is not required, the air pressure in the working air groove 41 can be increased to strengthen the tight fit between the inner slide bar 3 and the sealing ring 2, thereby maintaining a high airtightness between the inner slide bar 3 and the outer sleeve 1.

[0039] Reference Figure 1 and Figure 2 In order to smoothly change the tightness between the sealing ring 2 and the inner slide rod 3 through air pressure, the following settings are correspondingly provided: a guide block 21 is provided on the outer wall of the sealing ring 2, and a guide block 21 is inserted into a connecting hole 12. With the help of the cooperation between the guide block 21 and the connecting hole 12, the deformation direction of the sealing ring 2 is made more parallel to the diameter direction of the sealing ring 2, so that the air pressure change in the working air groove 41 can smoothly change the tightness between the sealing ring 2 and the inner slide rod 3. However, in order to prevent the guide block 21 from weakening the pressure transmitted to the sealing ring 2 to cause the sealing ring 2 to deform, from the perspective of material selection, the deformation ability of the guide block 21 should be smaller than the deformation ability of the sealing ring 2, so that the air pressure can fully act on the sealing ring 2, thereby maintaining the smoothness of the deformation of the sealing ring 2.

[0040] In addition, in this embodiment, in order to facilitate the installation of the sealing ring 2, an auxiliary ring 22 is provided at the end of the guide block 21 away from the sealing ring 2. The auxiliary ring 22 can be penetrated by an installation tool to facilitate the guide block 21 to be inserted into the connecting hole 12, thereby making the movable sleeve easier to assemble and disassemble.

[0041] Reference Figure 1 and Figure 2 In order to make it easier to assemble and disassemble the inner slide rod 3 and the outer sleeve 1, the inner diameter of the sealing ring 2 will be made larger than the outer diameter of the inner slide rod 3. Therefore, when the working gas groove 41 is not pressurized, the inner slide rod 3 is a clearance fit, so the assembly and disassembly between the inner slide rod 3 and the outer sleeve 1 can be more convenient. However, in order to simultaneously maintain the high air tightness between the inner slide rod 3 and the outer sleeve 1, the inner wall of the sealing ring 2 will be provided with a plurality of closing grooves 23, and the plurality of closing grooves 23 are evenly distributed around the center of the sealing ring 2. When pressure is applied to make the sealing ring 2 abut against the inner slide rod 3, the two opposite side walls of the closing grooves 23 abut against each other, so that the closing grooves 23 are closed, so that the sealing ring 2 and the inner slide rod 3 can be fully kept in a tight fit, thereby maintaining the high air tightness between the inner slide rod 3 and the outer sleeve 1.

[0042] Reference Figure 2 and Figure 3 In addition, in this embodiment, in order to further promote the degree of closure of the closing groove 23 under the pressurized state, the cross-section of the closing groove 23 perpendicular to its own length direction is triangular, thereby further improving the high airtightness between the inner slide rod 3 and the outer sleeve 1.

[0043] Reference Figure 2 and Figure 3In addition, in this embodiment, in order to compensate for the defect of reduced airtightness caused by the provision of the closing groove 23, a plurality of sealing rings 2 are spaced apart along the length direction of the outer sleeve 1, and the closing grooves 23 between two adjacent sealing rings 2 are staggered. Then, viewed along the axial direction of the outer sleeve 1, the plurality of closing grooves 23 are distributed in a curved path.

[0044] The implementation principle of a non-metallic high-air-tightness movable sleeve in an embodiment of the present application is as follows: during assembly or disassembly, the external air source may not pressurize the working air groove 41 to weaken the tight fit between the inner slide bar 3 and the sealing ring 2. This makes assembly and disassembly between the inner slide bar 3 and the outer sleeve 1 more convenient, thereby making the movable sleeve easy to repair and handle. During use, the air pressure in the working air groove 41 may be lower according to actual working conditions, for example, when the sleeve is to be extended or retracted, so that the tight fit between the inner slide bar 3 and the sealing ring 2 is weaker. When the sleeve is not to be extended or retracted, the air pressure in the working air groove 41 may be higher, so that the tight fit between the inner slide bar 3 and the sealing ring 2 is stronger, thereby maintaining high air tightness between the inner slide bar 3 and the outer sleeve 1.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A non-metallic high airtightness movable sleeve, characterized by: include: The outer sleeve (1) is provided with a sealing groove (11) and a communicating hole (12), wherein the notch of the sealing groove (11) is located on the inner wall of the outer sleeve (1), and the communicating hole (12) communicates with the sealing groove (11) and the outer wall of the outer sleeve (1); A sealing ring (2) is embedded in the sealing groove (11); An inner sliding rod (3) is slidably arranged on the inner side of the outer sleeve (1); A pneumatic ring (4) is sleeved on the outer sleeve (1), and a working air groove (41) is provided on the inner side of the pneumatic ring (4). The working air groove (41) is connected to the connecting hole (12). The working air groove (41) is used to connect to an external air source and change the tightness between the sealing ring (2) and the inner slide rod (3) through changes in air pressure.

2. The non-metallic high airtightness movable sleeve according to claim 1, characterized in that: A guide block (21) is provided on the outer wall of the sealing ring (2), and the guide block (21) is inserted into the communicating hole (12).

3. The non-metallic high airtightness movable sleeve according to claim 2, characterized in that: The deformation capacity of the guide block (21) is smaller than the deformation capacity of the sealing ring (2).

4. The non-metallic high airtightness movable sleeve according to claim 2, characterized in that: An auxiliary ring (22) is provided at one end of the guide block (21) away from the sealing ring (2), and the auxiliary ring (22) is used to be penetrated by an installation tool.

5. The non-metallic high airtightness movable sleeve according to claim 1, characterized in that: The inner diameter of the sealing ring (2) is greater than the outer diameter of the inner sliding rod (3).

6. The non-metallic high airtightness movable sleeve according to claim 5, characterized in that: The inner wall of the sealing ring (2) is provided with a plurality of closing grooves (23), and the plurality of closing grooves (23) are evenly distributed around the center of the sealing ring (2). When the sealing ring (2) abuts against the inner sliding rod (3), the two opposite side walls of the closing grooves (23) abut against each other.

7. The non-metallic high airtightness movable sleeve according to claim 6, characterized in that: The cross section of the closing through groove (23) perpendicular to its own length direction is triangular.

8. The non-metallic high airtightness movable sleeve according to claim 6, characterized in that: A plurality of sealing rings (2) are spaced apart and distributed along the length direction of the outer sleeve (1), and the closing grooves (23) between two adjacent sealing rings (2) are staggered.

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