Dynamic sealing structure and clamping and positioning device

Abstract

The utility model relates to the technical field of radioactive sample detection equipment, and particularly discloses a dynamic sealing structure and a clamping and positioning device. The dynamic sealing structure comprises a sample cavity, a first inner cavity, a second inner cavity, a reciprocating motion component and a stainless steel telescopic sleeve, the sample cavity is provided with a window; the first inner cavity is hermetically communicated with the window; the second inner cavity is communicated with the first inner cavity through a through hole directly facing the window; the reciprocating motion component is axially and movably arranged in the through hole; the stainless steel telescopic sleeve is arranged on the reciprocating motion component in the second inner cavity in a sleeving mode, one end of the stainless steel telescopic sleeve is connected with the reciprocating motion component in a sealed mode, and the other end of the stainless steel telescopic sleeve is movably connected with the reciprocating motion component in the axial direction and connected to the through hole in a sealed mode. The dynamic sealing structure and the clamping and positioning device are good in sealing performance after long-term use, high in reliability and free of maintenance.

Description

Technical Field

[0001] The utility model relates to the field of radioactive sample detection equipment, in particular to a dynamic sealing structure and a clamping and positioning device. Background Art

[0002] During the nuclear fuel reprocessing process, radioactive samples in each process section need to be tested and analyzed. Since radioactive samples are usually highly radioactive and toxic, once the sample chamber is contaminated by radioactive samples, it will cause serious harm to the external environment and it will be difficult to ensure the safety of personnel. Therefore, it is necessary to complete the clamping and positioning action of the sample placed in the sample chamber under a vacuum negative pressure environment.

[0003] In the prior art, rubber elastic sealing elements are usually used to achieve dynamic sealing of the sample chamber. However, due to reasons such as movement wear and radiation exposure, the rubber elastic sealing elements are prone to aging and failure, which increases the frequency of equipment failures and makes inspection and maintenance quite difficult. Summary of the invention

[0004] The utility model aims to provide a dynamic sealing structure and a clamping and positioning device, which have good sealing performance, high reliability and are maintenance-free in long-term use.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A dynamic sealing structure comprises a sample cavity, a first inner cavity, a second inner cavity, a reciprocating motion component and a stainless steel telescopic sleeve;

[0007] The sample cavity is provided with a window, the first inner cavity is sealed and connected to the window; the second inner cavity is connected to the first inner cavity through a through hole facing the window;

[0008] The reciprocating member is axially movably disposed in the through hole;

[0009] The stainless steel telescopic sleeve is sleeved on the reciprocating member in the second inner cavity, and one end is sealedly connected to the reciprocating member, and the other end is axially movably connected to the reciprocating member and sealedly connected to the through hole.

[0010] Furthermore, the stainless steel telescopic sleeve includes a sleeve body and two flanges connected to both ends of the sleeve body, wherein one of the flanges is coaxially and sealingly connected to the reciprocating member, and the other flange is axially movably connected to the reciprocating member and is sealingly connected to the through hole.

[0011] Furthermore, an annular sealing groove is formed on the opposite sides of the two flanges, and a flexible graphite sealing ring is arranged in the sealing groove.

[0012] Furthermore, the cross section of the sealing groove is M-shaped.

[0013] Furthermore, a flexible graphite sealing ring is provided at the window.

[0014] Furthermore, a fixing seat and a locking sleeve detachably connected to the fixing seat are provided on one side of the window, and the first inner cavity and the second inner cavity are both opened in the locking sleeve.

[0015] Furthermore, a mounting hole for axially mounting the locking sleeve is provided in the fixing seat, a spring is provided in the mounting hole, two ends of the spring are respectively against the locking sleeve and the fixing seat, and the expansion and contraction direction of the spring is consistent with the central axis direction of the mounting hole; a limiting member for locking the locking sleeve is provided on the fixing seat.

[0016] The utility model also provides a clamping and positioning device, comprising two clamps for clamping samples, a driving member and a dynamic sealing structure as described in any one of claims 1 to 4; one of the clamps is installed in the sample cavity, and the other clamp is connected to the end of the reciprocating member located in the first inner cavity; the driving member is installed on the fixed seat and connected to the reciprocating member.

[0017] The beneficial effects of the utility model are:

[0018] One end of a stainless steel telescopic sleeve is sealingly sleeved with a reciprocating member, and the other end is axially movably connected with the reciprocating member and sealedly connected with a first inner cavity, and the first inner cavity is sealedly connected with a sample cavity, so that dynamic sealing is maintained during the axial movement of the reciprocating member, and the sample cavity is always in a vacuum negative pressure environment isolated from the atmospheric environment; in cooperation with two clamps, the sample in the sample cavity can be positioned and clamped under a vacuum negative pressure state; the dynamic sealing structure and the clamping and positioning device maintain good sealing performance, high reliability and maintenance-free after long-term use.

[0019] The use of flexible graphite sealing rings to replace conventional rubber sealing elements can not only achieve flexible sealing, but also have radiation resistance, which can avoid aging failure caused by long-term exposure to radioactive rays. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a dynamic sealing structure and a clamping and positioning device provided by the utility model.

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure of the stainless steel telescopic sleeve. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0023] like Figure 1 As shown, a dynamic sealing structure includes a sample chamber 1, a first inner chamber 71, a second inner chamber 72, a reciprocating member 4 and a stainless steel telescopic sleeve 6; wherein, the sample chamber 1 is provided with a window 11, and the first inner chamber 71 is sealed and connected to the window 11; the second inner chamber 72 is connected to the first inner chamber 71 through a through hole facing the window 11; the reciprocating member 4 is axially movably arranged in the through hole; the stainless steel telescopic sleeve 6 is sleeved on the reciprocating member 4 located in the second inner chamber 72, and one end is sealedly connected to the reciprocating member 4, and the other end is axially movably connected to the reciprocating member 4, and is sealed and connected at the through hole.

[0024] In this embodiment, Figure 2 As shown, the stainless steel telescopic sleeve 6 includes a sleeve body 61 and two flanges 62 connected to both ends of the sleeve body 61, one of the flanges 62 is coaxially sealed with the reciprocating member 4, and the other flange 72 is axially movably connected with the reciprocating member 4 and sealed with the through hole. The sleeve body 61 is formed by stacking and welding a plurality of stainless steel discs, and the two flanges 62 are welded to the sleeve body 61. The stainless steel telescopic sleeve 6 can be extended and retracted within a certain range, with a service life of up to 1 million times, reliable and stable vacuum sealing, and maintenance-free for long-term use.

[0025] Furthermore, an annular sealing groove 621 is provided on the opposite sides of the two flanges 62, and a flexible graphite sealing ring 3 is arranged in the sealing groove 621. Preferably, the cross section of the sealing groove 621 is M-shaped to increase the sealing surface while avoiding the rupture of the flexible graphite sealing ring 3, thereby ensuring reliable and stable sealing.

[0026] In this embodiment, the flexible graphite sealing ring 3 is used, which not only can achieve flexible sealing, but also has radiation resistance, thereby avoiding aging failure caused by long-term exposure to radioactive rays.

[0027] A flexible graphite sealing ring 3 is provided at the window 11 to ensure the sealed communication between the first inner cavity 71 and the sample cavity 1 .

[0028] Furthermore, a fixing seat 2 and a locking sleeve 7 detachably connected to the fixing seat 2 are provided on one side of the window 11 , and the first inner cavity 71 and the second inner cavity 72 are both opened in the locking sleeve 7 .

[0029] Specifically, a mounting hole for axially mounting the lock sleeve 7 is provided in the fixing seat 2, a spring 5 is provided in the mounting hole, the spring 5 is sleeved on the lock sleeve 7, and the two ends of the spring 5 are respectively against the lock sleeve 7 and the fixing seat 2, and the expansion and contraction direction of the spring 5 is consistent with the central axis direction of the mounting hole; a limiting member 21 for locking the lock sleeve 7 is provided on the fixing seat 2. The limiting member 21 can be a limiting structure such as a limiting pin or a limiting block.

[0030] During the disassembly process, after the limiting member 21 is removed, the lock sleeve 7 automatically pops out from the mounting hole under the elastic force of the spring 5 , thereby facilitating the removal of the lock sleeve 7 .

[0031] In this embodiment, the reciprocating member 4 is preferably a metal round shaft or a square shaft.

[0032] The utility model provides a dynamic sealing structure, which utilizes a stainless steel telescopic sleeve 6 to be sealingly sleeved with a reciprocating member 4 at one end, and to be axially movably connected to the reciprocating member 4 at the other end, and to be sealed and connected with a first inner cavity 71, and to be sealed and connected with a sample cavity 1 by utilizing the first inner cavity 71, thereby achieving dynamic sealing during the axial movement of the reciprocating member 4, so that the sample cavity 1 is always in a vacuum negative pressure environment isolated from the atmospheric environment.

[0033] The utility model also provides a clamping and positioning device, including two clamps 8 for clamping a sample 10, a driving member 9 and the above-mentioned dynamic sealing structure; one of the clamps 8 is installed in the sample chamber 1, and the other clamp 8 is connected to the end of the reciprocating member 4 located in the first inner chamber 71; the driving member 9 is installed on the fixed seat 2 and connected to the reciprocating member 4. The driving member 9 is preferably a cylinder.

[0034] The utility model provides a clamping and positioning device. When in use, under the drive of a driving member 9, a reciprocating member 4 moves axially, driving a clamp 8 to pass through a window 11 into a sample chamber 1, and cooperates with another clamp 8 located in the sample chamber 1 to position and clamp a sample 10. Due to the provision of a dynamic sealing structure, the sample chamber 1 is always in a vacuum negative pressure state during the entire clamping process, thereby realizing positioning and clamping of the sample 10 placed in the sample chamber 1 under a vacuum negative pressure state.

[0035] The utility model provides a dynamic sealing structure and a clamping and positioning device. Due to the use of a stainless steel telescopic sleeve 6 and a reciprocating component 4, on the one hand, the processing accuracy is reduced, which greatly simplifies the difficulty of assembly and debugging. On the other hand, the shortcoming of short-term aging vacuum failure caused by the use of rubber sealing elements in the reciprocating motion process is avoided, which greatly improves the stability and reliability of the device operation, and maintains good sealing performance and maintenance-free in long-term use.

[0036] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A dynamic sealing structure, characterized in that: It comprises a sample chamber (1), a first inner chamber (71), a second inner chamber (72), a reciprocating motion component (4) and a stainless steel telescopic sleeve (6); The sample chamber (1) is provided with a window (11); the first inner chamber (71) is in sealed communication with the window (11); the second inner chamber (72) is in communication with the first inner chamber (71) via a through hole facing the window (11); The reciprocating member (4) is axially movably arranged in the through hole; The stainless steel telescopic sleeve (6) is sleeved on the reciprocating member (4) located in the second inner cavity (72), and one end is sealedly connected to the reciprocating member (4), and the other end is axially movably connected to the reciprocating member (4) and sealedly connected to the through hole.

2. A dynamic sealing structure according to claim 1, characterized in that: The stainless steel telescopic sleeve (6) comprises a sleeve body (61) and two flanges (62) connected to both ends of the sleeve body (61), wherein one of the flanges (62) is coaxially sealed with the reciprocating member (4), and the other flange (62) is axially movably connected with the reciprocating member (4) and is sealed with the through hole.

3. A dynamic sealing structure according to claim 2, characterized in that: An annular sealing groove (621) is provided on opposite sides of the two flanges (62), and a flexible graphite sealing ring (3) is arranged in the sealing groove (621).

4. A dynamic sealing structure according to claim 3, characterized in that: The cross section of the sealing groove (621) is M-shaped.

5. A dynamic sealing structure according to claim 1, characterized in that: A flexible graphite sealing ring (3) is provided at the window (11).

6. A dynamic sealing structure according to claim 1, characterized in that: A fixing seat (2) and a locking sleeve (7) detachably connected to the fixing seat (2) are provided on one side of the window (11); the first inner cavity (71) and the second inner cavity (72) are both opened in the locking sleeve (7).

7. A dynamic sealing structure according to claim 6, characterized in that: A mounting hole for axially mounting the lock sleeve (7) is provided in the fixing seat (2), a spring (5) is provided in the mounting hole, two ends of the spring (5) respectively abut against the lock sleeve (7) and the fixing seat (2), and the expansion and contraction direction of the spring (5) is consistent with the central axis direction of the mounting hole; a limiting member (21) for locking the lock sleeve (7) is provided on the fixing seat (2).

8. A clamping and positioning device, characterized in that: It comprises two clamps (8) for clamping a sample (10), a driving member (9) and a dynamic sealing structure according to any one of claims 1 to 7; one of the clamps (8) is installed in the sample chamber (1), and the other clamp (8) is connected to the end of the reciprocating member (4) located in the first inner chamber (71); the driving member (9) is installed on the fixed seat (2) and connected to the reciprocating member (4).

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