Quick release structure of nuclear grade temperature instrument

Abstract

The application relates to the field of nuclear-grade thermometers, in particular to a quick-release structure of a nuclear-grade temperature instrument, which comprises a supporting pipe formed on a temperature instrument head, a sleeve pipe and a temperature-sensing element arranged on the supporting pipe, the temperature-sensing element is inserted in the sleeve pipe, the end of the supporting pipe is coaxially provided with an annular baffle, one end of the temperature-sensing element is electrically connected with the temperature instrument head, the other end passes through the annular baffle and is inserted in the sleeve pipe, one end of a jack-up screw sleeve which is threadedly connected with the end of the sleeve pipe towards the annular baffle abuts against the outside of the sleeve pipe, the other end abuts against the side wall of the annular baffle, the outside of the jack-up screw sleeve is threadedly connected with a locking screw sleeve, and the end of the locking screw sleeve away from the jack-up screw sleeve abuts against the side of the annular baffle away from the sleeve pipe, so that the dismounting process is stable, the sliding track of the temperature-sensing element is stable and difficult to bend.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear grade temperature gauges, in particular to a quick release structure of a nuclear grade temperature gauge. BACKGROUND

[0002] The working conditions of nuclear power plants are extremely harsh. In the reactor cooling system, the small inert platinum resistance temperature gauge for measuring the temperature of the cold and hot sections and the average temperature of the loop is a nuclear safety class 1 device. The instrument is required to withstand long-term high temperature, high pressure, irradiation and coolant high-speed impact conditions, and to withstand a relatively strong earthquake test.

[0003] Nuclear power plants have applications for nuclear grade temperature gauges with fast response, so that the nuclear grade temperature gauge armored temperature sensing element and the temperature gauge sleeve must be closely attached. However, such products are prone to have the phenomenon that the temperature gauge and the sleeve are difficult to pull out after long-term operation and use.

[0004] For a long time, the nuclear grade temperature gauge armored element is pulled out by manpower, and the manpower pulling method is easy to cause the nuclear grade temperature gauge armored element to be subjected to uneven upward force, which can cause the nuclear grade temperature gauge armored temperature sensing element to be bent or damaged, thereby causing the product to fail. SUMMARY

[0005] In order to solve the problem that the nuclear grade temperature gauge armored temperature sensing element closely attached to the temperature gauge sleeve type product is difficult to disassemble after long-term use, the present application provides a nuclear grade temperature gauge.

[0006] The quick release structure of the nuclear grade temperature gauge provided by the present application adopts the following technical scheme:

[0007] A quick release structure of a nuclear grade temperature gauge, comprising a support pipe formed on a temperature gauge head, a sleeve, and a temperature sensing element arranged on the support pipe, the temperature sensing element being inserted into the sleeve, an end of the support pipe being coaxially provided with an annular baffle, one end of the temperature sensing element being electrically connected to the temperature gauge head, the other end of the temperature sensing element passing through the annular baffle and being inserted into the sleeve, one end of the sleeve towards the annular baffle being threadedly connected with a lifting screw, one end of the lifting screw abutting against the outside of the sleeve, and the other end of the lifting screw abutting against the side wall of the annular baffle, the outside of the lifting screw being threadedly connected with a locking screw, and one end of the locking screw away from the lifting screw abutting against the side of the annular baffle away from the sleeve.

[0008] By adopting the above technical scheme, during the disassembly of the temperature sensing element, the locking screw is twisted in advance to completely separate the locking screw from the lifting screw, and then the lifting screw is twisted again. During the rotation of the lifting screw, the lifting screw abutting against the annular baffle slides in the direction of its own axis until the temperature sensing element is separated from the sleeve. The disassembly of the temperature sensing element is achieved by twisting the lifting screw, and the disassembly process is stable, and the sliding track of the temperature sensing element is smooth and difficult to bend.

[0009] Optionally, the sleeve is provided with a stepped groove and a connecting column at one end of the support tube, the jack screw includes a first annular block abutting on the stepped groove, a first connecting tube integrally formed at one side of the first annular block, and a second annular block integrally formed at one end of the first connecting tube away from the first annular block, the first connecting tube is threadedly connected outside the connecting column, and the second annular block is clamped between the annular baffle and the end of the connecting column.

[0010] By adopting the above technical scheme, the first connecting tube is screwed to make the whole first connecting tube slide along the axial direction of itself to the direction away from the sleeve, so that the second annular block abuts against the annular baffle to slide smoothly until the whole temperature sensing element is separated from the sleeve.

[0011] Optionally, the outer diameter of the annular baffle is smaller than the outer diameter of the first connecting tube, the locking screw includes a second connecting tube threadedly connected outside the first connecting tube and a third annular block integrally formed at one end of the second connecting tube, and the third annular block abuts at one side of the annular baffle away from the sleeve.

[0012] By adopting the above technical scheme, the annular baffle can be wrapped in the locking screw, and when the locking screw is threadedly connected to the jack screw, the annular baffle can be abutted and pressed at the end of the jack screw.

[0013] Optionally, the outer side of the first annular block and the third annular block is formed with a clamping edge surface, the outer side of the second connecting tube is provided with an avoiding groove and an avoiding part, and the outer diameter of the avoiding part is smaller than the outer diameter of the first annular block.

[0014] By adopting the above technical scheme, the wrench is used to screw the clamping edge surface during the screwing of the first annular block and the third annular block, so as to facilitate the screwing of the staff, and the avoiding part is provided to avoid interference during the screwing of the second connecting tube.

[0015] Optionally, a plurality of balls are uniformly arranged at one side of the second annular block away from the sleeve, the balls are rotatably connected to the side wall of the second annular block, and the side wall of the annular baffle is provided with an annular groove for embedding the balls.

[0016] By adopting the above technical scheme, the second annular block abuts against the annular baffle in the axial direction during the screwing of the jack screw, and the balls reduce the friction between the second annular block and the annular baffle.

[0017] Optionally, the edges of the first annular block and the second annular block are provided with chamfers.

[0018] By adopting the above technical scheme, the staff is difficult to scratch the palm during the screwing.

[0019] Optionally, the annular baffle is integrally formed with a ball seat away from one side of the support pipe, the end of the sleeve pipe is provided with a positioning groove for embedding the ball seat, and the temperature sensing element is inserted into the sleeve pipe through the ball seat.

[0020] By adopting the above technical scheme, the positioning of the support pipe is facilitated during the process of inserting the temperature sensing element into the inner cavity of the sleeve pipe, and the smooth insertion of the temperature sensing element into the inner cavity of the sleeve pipe is ensured.

[0021] Optionally, the side of the ball seat coaxially fixed with the positioning groove is provided with a guide pipe, the inner wall of the positioning groove is provided with a plug-in port for plugging the guide pipe, and the temperature sensing element is coaxially plugged into the inner cavity of the guide pipe.

[0022] By adopting the above technical scheme, the guide pipe plays a guiding role during the process of pushing the support pipe outward along the axial direction of the sleeve pipe, so that the side wall of the temperature sensing element is difficult to touch the inner cavity of the sleeve pipe, and the temperature sensing element is difficult to bend during the pulling process.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The temperature sensing element is disassembled by twisting and jacking the screw sleeve, the disassembly process is stable, and the sliding trajectory of the temperature sensing element is smooth and difficult to bend.

[0025] 2. During the process of twisting and jacking the screw sleeve, the second annular block abuts against the annular baffle along the axial direction, and the friction between the second annular block and the annular baffle is reduced by arranging the ball. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural sectional view of the sleeve pipe part of the present embodiment.

[0027] Figure 2 is Figure 1 is a local enlarged view of A in

[0028] Reference signs: 1, support pipe; 2, sleeve pipe; 3, temperature sensing element; 4, annular baffle; 5, jacking screw sleeve; 6, locking screw sleeve; 7, connecting column; 8, first annular block; 9, first connecting pipe; 10, second annular block; 11, second connecting pipe; 12, third annular block; 13, clamping edge face; 14, avoiding part; 15, ball; 16, ring groove; 17, ball seat; 18, positioning groove; 19, guide pipe; 20, plug-in port. DETAILED DESCRIPTION

[0029] The following will be combined with the Figures 1-2 The present application will be further described in detail.

[0030] The embodiment of the application discloses a quick release structure of a nuclear-grade temperature instrument.

[0031] With reference to Figure 1 The quick release structure of the nuclear-grade temperature instrument comprises a support pipe 1 fixedly connected to the outer side wall of the temperature instrument, and a sleeve pipe 2. In actual use, the sleeve pipe 2 of the nuclear-grade temperature instrument is fixed at the cold and hot sections of a loop in a reactor cooling system for measurement. A temperature sensing element 3 is coaxially arranged in the support pipe 1. The temperature sensing element 3 is an elongated probe head. In actual use, one end of the temperature sensing element 3 is inserted into the inner cavity of the sleeve pipe 2, and the other end is inserted into the support pipe 1 and electrically connected to the temperature instrument, so that the temperature sensing element 3 senses the temperature on the side to realize detection.

[0032] With reference to Figure 1 And 2 In order to prevent the temperature sensing element 3 from being bent during pulling out of the inner cavity of the sleeve pipe 2 for maintenance, an annular baffle 4 is coaxially fixed to the end of the support pipe 1. A jacking screw sleeve 5 is arranged at one end of the sleeve pipe 2 facing the support pipe 1. One end of the jacking screw sleeve 5 is threadedly connected to the outer side of the sleeve pipe 2, and the other end abuts against the side of the annular baffle 4 facing the sleeve pipe 2. Thus, the jacking screw sleeve 5 only needs to be screwed during disassembly of the temperature sensing element 3.

[0033] With reference to Figure 1 And 2 The jacking screw sleeve 5 comprises a first annular block 8, a first connecting pipe 9 and a second annular block 10. The outer diameter of the first annular block 8 is larger than that of the second annular block 10. In order to provide good support for the jacking screw sleeve 5 during installation of the temperature sensing element 3, a stepped groove is formed at one end of the sleeve pipe 2 facing the support pipe 1. The stepped groove is connected to the outer side of the sleeve pipe 2, so that a connecting column 7 is formed at one end of the sleeve pipe 2 facing the support pipe 1, and the connecting column 7 forms a stepped surface with the sleeve pipe 2.

[0034] With reference to Figure 1 And 2 The first annular block 8 is threadedly connected to the outer side of the connecting column 7. The first annular block 8 abuts against the stepped surface in the initial state. The first connecting pipe 9 is integrally formed on the side wall of the first annular block 8. The outer diameter of the first connecting pipe 9 is smaller than that of the first annular block 8. The second annular block 10 is integrally formed on the inner wall of one end of the first connecting pipe 9 away from the first annular block 8. The side of the second annular block 10 away from the first annular block 8 abuts against the side wall of the annular baffle 4.

[0035] With reference to Figure 1 And 2In order to reduce the abrasion caused by the sliding of the second annular block 10 against the annular baffle 4, a plurality of rolling balls 15 are uniformly arranged on the side of the second annular block 10 away from the sleeve 2, and the rolling balls 15 are rotatably connected to the side wall of the second annular block 10. An annular groove 16 is formed on the side of the annular baffle 4 abutting against the second annular block 10, and the rolling balls 15 are embedded in the annular groove 16 and can roll in the annular groove 16.

[0036] With reference to Figure 1 and 2 Meanwhile, a clamping edge 13 is formed on the outer side of the first annular block 8, so as to facilitate the rotation of the first annular block 8 by a worker using a wrench. In order to prevent the worker's palm from being scratched during the installation process, a chamfer is formed on the edge of the first annular block 8.

[0037] With reference to Figure 1 and 2 In order to prevent the temperature sensing element 3 from being bent when the second annular block 10 slides along the axial direction of the annular baffle 4 during the rotation of the first annular block 8, a ball seat 17 is integrally formed on the side of the annular baffle 4 away from the support pipe 1, and a positioning groove 18 is formed in the end of the sleeve 2, which is semispherical. Through the above arrangement, the temperature sensing element 3 is always located at the central part of the support pipe 1 during the connection of the support pipe 1 and the sleeve 2, and the temperature sensing element 3 can be quickly and smoothly inserted into the inner cavity of the sleeve 2.

[0038] With reference to Figure 1 and 2 The end of the temperature sensing element 3 away from the temperature instrument passes through the center of the ball seat 17 and is inserted into the inner cavity of the sleeve 2, and a guide pipe 19 is fixed on the outer side of the ball seat 17, which communicates with the inner cavity of the support pipe 1. The temperature sensing element 3 passes through the ball seat 17 and the guide pipe 19 in sequence and is inserted into the inner cavity of the sleeve 2. The inner wall of the positioning groove 18 is provided with a plug-in port 20 for plugging the guide pipe 19, and the plug-in port 20 communicates with the inner cavity of the sleeve 2. During the movement of the second annular block 10 away from the sleeve 2, the guide pipe 19 ensures that the temperature sensing element 3 cannot directly contact the inner wall of the inner cavity of the sleeve 2, so that the temperature sensing element 3 still remains in the central position of the inner cavity of the sleeve 2, thereby reducing the risk of bending of the temperature sensing element 3.

[0039] With reference to Figure 1 and 2, in order to ensure that the annular baffle 4 is pressed against the end of the sleeve pipe 2 during the process of connecting the support pipe 1 to the sleeve pipe 2, a locking sleeve 6 is threadedly connected to the outer side of the jacking sleeve 5, the locking sleeve 6 comprises a second connecting pipe 11 and a third annular block 12, the second connecting pipe 11 is threadedly connected to the side wall of the first connecting pipe 9, and the annular baffle 4 is located in the inner cavity of the second connecting pipe 11, the diameter of the annular baffle 4 is smaller than the outer diameter of the second annular block 10, the third annular block 12 is integrally formed at the end of the second connecting pipe 11 away from the sleeve pipe 2, and the third annular block 12 abuts against the side of the annular baffle 4 away from the second annular block 10. The outer edge of the third annular block 12 is provided with a chamfer.

[0040] Referring to Figure 1 and 2 In the process of installing the support pipe 1 on the sleeve pipe 2, in order to facilitate the rotation of the second connecting pipe 11, a clamping edge 13 is also provided on the side wall of the third annular block 12, and the third annular block 12 can be rotated by an open-end wrench. In order to reduce the interference between the first annular block 8 and the second connecting pipe 11 during the rotation of the first annular block 8, an avoiding part 14 is provided on the outer side of the second connecting pipe 11, the avoiding part 14 is a groove provided on the outer side of the second connecting pipe 11, and the groove is communicated with the end of the second connecting pipe 11 towards the first annular block 8. Thus, the outer diameter of the end of the second connecting pipe 11 close to the first annular block 8 is smaller than the outer diameter of the first annular block 8.

[0041] The implementation principle of the quick release structure of the nuclear grade temperature instrument according to the embodiment of the application is as follows: in the process of installing the support pipe 1 on the sleeve pipe 2, the jacking sleeve 5 is threadedly connected to the connecting column 7 in advance, then the temperature sensing element 3 is inserted into the inner cavity of the sleeve pipe 2, and the ball seat 17 is embedded in the positioning groove 18, the locking sleeve 6 coaxially sleeved outside the support pipe 1 is moved to the position of the annular baffle 4, at this time, the entire second connecting pipe 11 is rotated, so that the second connecting pipe 11 is threadedly connected to the outer side of the first connecting pipe 9, until the third annular block 12 presses the annular baffle 4 against the side wall of the second annular block 10.

[0042] In the process of disassembling the temperature sensing element 3, the entire locking sleeve 6 is rotated in advance, so that the locking sleeve 6 is completely separated from the second connecting pipe 11, at this time, the first annular block 8 is rotated, and in the process of rotation, the first annular block 8 slides along the axial direction of the sleeve pipe 2, until the second annular block 10 abuts against the annular baffle 4, in the entire process, under the action of the ball seat 17 and the guide pipe 19, the temperature sensing element 3 is smoothly slid out along the axial direction of the sleeve pipe 2, and it is difficult to bend.

[0043] The above are the preferred embodiments of the application, which do not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A quick release structure of a nuclear grade temperature instrument, comprising a support tube (1) formed on a temperature instrument head, a sleeve tube (2), and a temperature sensing element (3) arranged on the support tube (1), the temperature sensing element (3) being inserted into the sleeve tube (2), characterized in that: The end of the support pipe (1) is coaxially provided with an annular baffle (4), one end of the temperature sensing element (3) is electrically connected with a temperature instrument head, the other end passes through the annular baffle (4) and is inserted into the sleeve pipe (2), one end of the sleeve pipe (2) is threadedly connected with a jacking sleeve (5) towards the annular baffle (4), one end of the jacking sleeve (5) abuts against the outside of the sleeve pipe (2), the other end abuts against the side wall of the annular baffle (4), the outside of the jacking sleeve (5) is threadedly connected with a locking sleeve (6), one end of the locking sleeve (6) away from the jacking sleeve (5) abuts against the side of the annular baffle (4) away from the sleeve pipe (2); the end of the sleeve pipe (2) towards the support pipe (1) is provided with a stepped groove and a connecting column (7), the jacking sleeve (5) comprises a first annular block (8) abutting against the stepped groove, a first connecting pipe (9) integrally formed on the side of the first annular block (8) towards the support pipe (1), and a second annular block (10) integrally formed on the end of the first connecting pipe (9) away from the first annular block (8), the first connecting pipe (9) is threadedly connected to the outside of the connecting column (7), and the second annular block (10) is clamped between the annular baffle (4) and the end of the connecting column (7); the side of the annular baffle (4) away from the support pipe (1) is integrally formed with a ball seat (17), the end of the sleeve pipe (2) is provided with a positioning groove (18) for embedding the ball seat (17), and the temperature sensing element (3) is inserted into the sleeve pipe (2) after passing through the ball seat (17); the side of the ball seat (17) abutting against the positioning groove (18) is coaxially fixed with a guide pipe (19), the inner wall of the positioning groove (18) is provided with a plug interface (20) for plugging the guide pipe (19), and the temperature sensing element (3) is coaxially arranged in the inner cavity of the guide pipe (19).

2. The quick release structure of a nuclear grade temperature instrument according to claim 1, characterized in that: The outer diameter of the annular baffle (4) is smaller than the outer diameter of the first connecting pipe (9), the locking sleeve (6) comprises a second connecting pipe (11) threadedly connected to the outside of the first connecting pipe (9) and a third annular block (12) integrally formed on one end of the second connecting pipe (11), and the third annular block (12) abuts against the side of the annular baffle (4) away from the sleeve pipe (2).

3. The quick release structure of a nuclear grade temperature instrument according to claim 2, characterized in that: The outside of the first annular block (8) and the third annular block (12) is formed with a clamping edge surface (13), and the outside of the second connecting pipe (11) is provided with an avoiding groove and an avoiding part (14), and the outer diameter of the avoiding part (14) is smaller than the outer diameter of the first annular block (8).

4. The quick release structure of a nuclear grade temperature instrument according to claim 2, characterized in that: The side of the second annular block (10) away from the sleeve pipe (2) is uniformly provided with a plurality of balls (15) which are rotationally connected to the side wall of the second annular block (10), and the side wall of the annular baffle (4) is provided with a ring groove (16) for embedding the balls (15).

5. The quick release structure of a nuclear grade temperature instrument according to claim 2, characterized in that: The edges of the first annular block (8) and the second annular block (10) are provided with chamfers.

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