Thermocouple vacuum group testing device

Abstract

This application relates to a thermocouple vacuum group inspection device, belonging to the technical field of thermocouple detection. The thermocouple vacuum group inspection device includes a mounting frame, a vacuum chamber, a ball valve, and a vacuum pump. When the ball valve is opened, it is convenient for the thermocouples to be tested to pass through and be inserted into the vacuum chamber. There is a clamp on the ball valve for fixing and sealing the thermocouples to be tested, and a detection component for detecting the vacuum value in the vacuum chamber. In this application, by opening the corresponding ball valve, then successively passing multiple groups of thermocouples to be tested through the corresponding ball valves and inserting them into the vacuum chamber, and then the clamp clamps and fixes the thermocouples to be tested with the ball valve, thereby ensuring that there is always a sealed connection between the thermocouple and the flange surface of the ball valve during the measurement process; then the vacuum pump is started. After the detection value of the detection component reaches the set value, the vacuum pump is turned off. After waiting for a certain period of time, the reading of the detection component is observed again. If the reading of the detection component does not change or only changes slightly, it is determined that the vacuum performance of this batch of thermocouples to be tested is excellent and the inspection is qualified.

Description

Technical Field

[0001] This application relates to the technical field of thermocouple testing, and in particular to a thermocouple vacuum group testing device. Background Technology

[0002] Thermocouples are commonly used temperature measuring elements in temperature measuring instruments. They directly measure temperature and convert the temperature signal into a thermoelectric potential signal, which is then converted into the temperature of the measured medium by an electrical instrument (secondary instrument).

[0003] Currently, thermocouples require vacuum performance testing after production to ensure product qualification rates. However, while components are tested during production, assembled thermocouples are not, or testing can only be performed individually. Utility Model Content

[0004] To facilitate vacuum performance testing of multiple assembled thermocouples, this application provides a thermocouple vacuum group testing device.

[0005] The thermocouple vacuum group detection device provided in this application adopts the following technical solution:

[0006] A thermocouple vacuum group testing device includes a mounting frame with a vacuum chamber. Multiple sets of ball valves are installed at opposite ends of the vacuum chamber. When the ball valves are closed, they seal the vacuum chamber. A vacuum pump is installed on the mounting frame to provide a vacuum environment for the vacuum chamber. When the ball valves are open, the thermocouple to be tested can pass through and be inserted into the vacuum chamber. Clamps are installed on the mounting frame to fix and seal the thermocouple to be tested onto the ball valves. A detection component is installed on the vacuum chamber to detect the vacuum value within the vacuum chamber.

[0007] By adopting the above technical solution, the corresponding ball valves are opened according to the number and installation position of the thermocouples to be tested. Then, multiple sets of thermocouples to be tested are sequentially passed through the corresponding ball valves and inserted into the vacuum chamber, ensuring that the thermocouples to be tested are tightly sealed against the flange face of the ball valve on the side away from the vacuum chamber. Then, clamps are used to clamp and fix the thermocouples to be tested to the ball valve, thereby ensuring that the thermocouples and the flange face of the ball valve maintain a sealed connection throughout the measurement process. Next, the vacuum pump is turned on to start working. When the detection value of the detection component reaches the set value, the vacuum pump is turned off. After a certain period of time, the reading of the detection component is observed again. If the reading of the detection component does not change or only changes slightly, it is determined that the vacuum performance of this batch of thermocouples to be tested is excellent and the inspection is qualified.

[0008] Furthermore, multiple sets of ball valves at both ends of the vacuum chamber are staggered, and the positions of multiple sets of thermocouples to be tested inserted into the vacuum chamber through the ball valves are staggered.

[0009] By adopting the above technical solution and staggering the multiple sets of ball valves, the probability of multiple sets of thermocouples under test colliding with each other in the vacuum chamber is reduced, thereby improving the compactness of the vacuum chamber.

[0010] Furthermore, the detection component includes:

[0011] A vacuum gauge is installed on a vacuum chamber and communicates with the interior of the vacuum chamber. The vacuum gauge is used to detect the vacuum value inside the vacuum chamber.

[0012] A resistance vacuum gauge is installed on a vacuum chamber and used to detect the vacuum value of the vacuum chamber.

[0013] By adopting the above technical solution, after stabilizing the air pressure value in the vacuum chamber, the vacuum performance of the thermocouples under test can be judged by observing the changes in the vacuum values ​​of the vacuum gauge and the resistance vacuum meter. At the same time, the reliability of the test is improved by comparing the data of the vacuum gauge and the resistance vacuum meter.

[0014] Furthermore, the mounting bracket is provided with multiple sets of fixing components for detachably fixing the vacuum chamber. These multiple sets of fixing components are spaced apart along the length of the vacuum chamber. Each fixing component includes:

[0015] A support base, which is mounted on a mounting frame and used to support and fix the bottom of the vacuum chamber;

[0016] A clamping clamp is provided, which bypasses the vacuum chamber and is slidably mounted on the support base, thereby clamping the vacuum chamber onto the support base.

[0017] A fixing bolt is rotatably mounted on the support base and is used to thread and fix the two ends of the clamping hoop.

[0018] By adopting the above technical solution, the vacuum chamber is placed on the support base, and then the clamping clamp is used to clamp the vacuum chamber onto the support base. Finally, the clamping clamp is fixedly connected to the support base by fixing bolts, which facilitates the detachable installation between the vacuum chamber and the mounting bracket.

[0019] Furthermore, the clamping clamp includes:

[0020] A U-shaped tube is pressed against the end of the vacuum chamber away from the support.

[0021] Locking rods, two sets of the locking rods are set at both ends of the U-shaped tube, the locking rods pass through the support base and are threadedly connected to the fixing bolts;

[0022] A locking bolt, the locking bolt being threaded on the locking rod and used to abut against the support to lock the position of the locking rod.

[0023] By adopting the above technical solution, the U-shaped tube can be easily clamped to the vacuum chamber, and the locking rod can easily tighten the U-shaped tube, thereby improving the fixing effect of the vacuum chamber; at the same time, the locking rod is reinforced again by the locking bolt, which improves the connection stability between the locking rod and the support base.

[0024] Furthermore, the vacuum chamber is detachably connected to the ball valve via a connecting assembly, the connecting assembly comprising:

[0025] A connecting pipe, which is sealed on the end face of the vacuum chamber and communicates with the interior of the vacuum chamber;

[0026] A flange is provided on the end of the connecting pipe away from the vacuum chamber. An annular groove is provided on the side of the flange near the ball valve. A sealing ring is provided in the annular groove. The flange and the flange face of the ball valve are pressed against each other and sealed together by the sealing ring.

[0027] By adopting the above technical solution, when the ball valve needs to be replaced, the old ball valve is removed, and then the flange face of the new ball valve is pressed against the flange and sealed with a sealing ring, which facilitates the disassembly and installation of the ball valve.

[0028] Furthermore, the vacuum pump is connected to the interior of the vacuum chamber via an exhaust pipe and is used to adjust the vacuum value inside the vacuum chamber. The exhaust pipe is threadedly connected to the vacuum pump via a connector, and a control valve for controlling the opening and closing of the exhaust pipe is provided on the side of the exhaust pipe near the vacuum chamber.

[0029] By adopting the above technical solution, the control valve adjusts the extraction speed of the vacuum chamber, and the control valve is closed when the vacuum pump is turned off, thereby improving the sealing of the vacuum chamber and facilitating the improvement of the detection accuracy of the thermocouple under test.

[0030] Furthermore, the mounting frame is provided with a placement platform for placing the vacuum pump. The placement platform is vertically offset from the vacuum chamber. The bottom of the mounting frame is provided with multiple sets of suction nozzles to improve the connection strength between the mounting frame and the ground.

[0031] By adopting the above technical solution, the vacuum pump and vacuum chamber are staggered, which reduces the mutual interference between the vacuum pump and vacuum chamber. At the same time, by adsorbing the ground through the suction nozzle, the vibration amplitude of the equipment is reduced, and the stability of the detection environment is improved.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] Open the corresponding ball valves according to the number and installation positions of the thermocouples to be tested. Then, sequentially pass multiple groups of thermocouples to be tested through the corresponding ball valves and insert them into the vacuum chamber, and make the thermocouples to be tested tightly sealed on the flange surface on the side of the ball valve far from the vacuum chamber. Then, use a clamp to tightly fasten the thermocouples to be tested to the ball valve, so as to ensure that there is always a sealed connection between the thermocouple and the flange surface of the ball valve during the measurement process. Then, turn on the vacuum pump to make the vacuum pump start working. When the readings of the vacuum gauge and the resistance vacuum gauge both reach the set values, turn off the power switch of the vacuum pump, and at the same time close the exhaust pipe through the control valve to keep the vacuum chamber sealed. After waiting for 5 minutes, observe the readings of the vacuum gauge and the resistance vacuum gauge again. If the readings of the vacuum gauge and the resistance vacuum gauge do not change or only change slightly, it is determined that the vacuum performance of this batch of thermocouples to be tested is excellent and the inspection is qualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of the thermocouple vacuum group inspection device of the present application;

[0035] Figure 2 is Figure 1 an enlarged schematic diagram of part A in

[0036] Figure 3 is Figure 1 an enlarged schematic diagram of part B in

[0037] Figure 4 is a schematic structural diagram of the thermocouple vacuum group inspection device of the present application, mainly showing the structure of the exhaust pipe.

[0038] Reference numerals: 1, mounting frame; 11, placement table; 2, vacuum chamber; 3, fixing component; 31, support base; 32, clamping hoop; 321, U-shaped pipe; 322, locking rod; 323, locking bolt; 33, fixing bolt; 4, detection component; 41, vacuum gauge; 42, resistance vacuum gauge; 5, connection component; 51, connecting pipe; 52, flange; 6, exhaust pipe; 61, connector; 62, control valve; 7, ball valve; 8, vacuum pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The following Figures 1-4 further describes the present application in detail in conjunction with the attached

[0040] The embodiment of the present application discloses a thermocouple vacuum group inspection device.

[0041] Refer to Figure 1The thermocouple vacuum group testing device includes a mounting frame 1, a vacuum chamber 2 on the mounting frame 1, and multiple sets of ball valves 7 on both ends of the vacuum chamber 2. When the multiple sets of ball valves 7 are closed, the vacuum chamber 2 is sealed. A vacuum pump 8 is provided on the mounting frame 1 for adjusting the vacuum value in the vacuum chamber 2. When the ball valves 7 are open, it is convenient for the thermocouple to be tested to pass through and be inserted into the vacuum chamber 2. A clamp is provided on the mounting frame 1 for fixing and sealing the thermocouple to be tested on the ball valves 7. A detection component 4 is provided on the vacuum chamber 2 for detecting the vacuum value in the vacuum chamber 2.

[0042] Reference Figure 1 The mounting frame 1 is fixedly installed on the ground. Multiple suction nozzles are fixedly installed at the bottom of the mounting frame 1 to improve the connection strength between the mounting frame 1 and the ground. When the mounting frame 1 is installed on the ground, the bottom of the mounting frame 1 supports the mounting frame 1. At the same time, the gas in the suction nozzle is discharged under the force of the mounting frame 1, thereby firmly suctioning the suction nozzle to the ground. A placement platform 11 for placing the vacuum pump 8 is fixedly installed on the mounting frame 1. The placement platform 11 is vertically offset from the vacuum chamber 2 to facilitate the installation of the vacuum pump 8 and the vacuum chamber 2.

[0043] Reference Figure 1 and Figure 2 The vacuum chamber 2 is detachably mounted on the mounting frame 1 via multiple sets of fixing components 3. The multiple sets of fixing components 3 are spaced apart along the length of the vacuum chamber 2. The fixing components 3 include a support base 31, a clamping clamp 32, and fixing bolts 33. The vacuum chamber 2 is a cylindrical structure that is sealed at both ends and hollow inside. The support base 31 is fixedly mounted on the upper surface of the mounting frame 1. The support base 31 is used to support and fix the bottom of the vacuum chamber 2. In order to improve the support and fixing effect of the support base 31 on the vacuum chamber 2, an arc-shaped groove is provided on the support base 31 to engage with the bottom of the vacuum chamber 2. The clamping clamp 32 passes around the vacuum chamber 2 and slides on the support base 31. The clamping clamp 32 clamps the vacuum chamber 2 onto the support base 31. The fixing bolts 33 are rotatably mounted on the support base 31 and located on the side away from the vacuum chamber 2. The fixing bolts 33 are used to thread and fix the two ends of the clamping clamp 32.

[0044] Reference Figure 2 The clamping clamp 32 includes a U-shaped tube 321, a locking rod 322, and a locking bolt 323. The inner wall of the U-shaped tube 321 is pressed against the end of the vacuum chamber 2 away from the support seat 31. Two sets of locking rods 322 are provided, and the two sets of locking rods 322 are fixedly installed on both ends of the U-shaped tube 321. The end of the locking rod 322 away from the U-shaped tube 321 is threadedly connected to the fixing bolt 33. The locking bolt 323 is threadedly installed on the locking rod 322 and is used to press against the support seat 31. The locking bolt 323 is used to lock the position of the locking rod 322.

[0045] Reference Figure 1 and Figure 2 During installation, first place the vacuum chamber 2 in the arc-shaped groove of the multiple support seats 31, then pass the clamping clamp 32 around the vacuum chamber 2 and make the inner wall of the U-shaped tube 321 press against the side wall of the vacuum chamber 2, then rotate the fixing bolt 33 to drive the clamping clamp 32 to slide closer to the support seat 31, and finally lock the vacuum chamber 2 onto the support seat 31. Finally, rotate the locking bolt 323 and press it against the upper surface of the support seat 31 to lock and fix the clamping clamp 32.

[0046] Reference Figure 1 The detection component 4 includes a vacuum gauge 41 and a resistance vacuum meter 42. The vacuum gauge 41 is fixedly installed on the vacuum chamber 2 and is connected to the inside of the vacuum chamber 2. The vacuum gauge 41 is used to detect the vacuum value inside the vacuum chamber 2. The resistance vacuum meter 42 is fixedly installed on the vacuum chamber 2 and is used to detect the vacuum value inside the vacuum chamber 2. The vacuum gauge 41 and the resistance vacuum meter 42 work together to achieve accurate measurement of the vacuum value inside the vacuum chamber 2.

[0047] Reference Figure 1 Since the thermocouples to be tested need to pass through the ball valves 7 and be inserted into the vacuum chamber 2, in order to reduce the probability of collisions between multiple sets of thermocouples to be tested inserted into the vacuum chamber 2, multiple sets of ball valves 7 at both ends of the vacuum chamber 2 are installed in a staggered manner, so that the positions of multiple sets of thermocouples to be tested inserted into the vacuum chamber 2 through the ball valves 7 are staggered. In this embodiment, four sets of ball valves 7 are provided on one end of the vacuum chamber 2, and adjacent ball valves 7 are installed at a 90-degree interval, and the ball valves 7 at both ends of the vacuum chamber 2 are staggered by 45 degrees.

[0048] Reference Figure 3 Vacuum chamber 2 is detachably connected to ball valve 7 via connecting assembly 5. Connecting assembly 5 includes connecting pipe 51 and flange 52. Connecting pipe 51 is sealed and installed on the end face of vacuum chamber 2 and communicates with the interior of vacuum chamber 2. Connecting pipe 51 is parallel to the axis of vacuum chamber 2. Flange 52 is fixedly installed on the end of connecting pipe 51 away from vacuum chamber 2. An annular groove is provided on the side of flange 52 near ball valve 7. A sealing ring is sealed and installed in the annular groove. When flange 52 and the flange face of ball valve 7 can be pressed together, they are sealed and connected by the sealing ring. Flange 52 and the flange face of ball valve 7 are detachably locked by bolts.

[0049] Reference Figure 4 The vacuum pump 8 is connected to the inside of the vacuum chamber 2 through the exhaust pipe 6 and is used to adjust the vacuum value in the vacuum chamber 2. The exhaust pipe 6 is threadedly connected to the vacuum pump 8 through the connector 61. A control valve 62 for controlling the opening and closing of the exhaust pipe 6 is provided on the side of the exhaust pipe 6 near the vacuum chamber 2.

[0050] Reference Figure 1 When performing vacuum performance testing on the thermocouples under test, first close all ball valves 7, then start the vacuum pump 8, and determine the vacuum performance of the vacuum chamber 2 without the thermocouples under test installed. Once the test is passed, open the corresponding ball valves 7 according to the number and installation position of the thermocouples under test. Then, sequentially insert multiple sets of thermocouples under test through their respective ball valves 7 and into the vacuum chamber 2, ensuring that the thermocouples are tightly sealed against the flange face of the ball valve 7 on the side away from the vacuum chamber 2. Then, clamps are used to secure the thermocouples to the ball valves 7, ensuring a sealed connection between the thermocouples and the flange face of the ball valve 7 throughout the measurement process. Then, open... Start vacuum pump 8 to begin operation. Once the readings of vacuum gauge 41 and resistance vacuum gauge 42 reach the set values, turn off the power switch of vacuum pump 8. Simultaneously, close exhaust pipe 6 through control valve 62 to keep vacuum chamber 2 sealed. After waiting for 5 minutes, observe the readings of vacuum gauge 41 and resistance vacuum gauge 42 again. If the readings of vacuum gauge 41 and resistance vacuum gauge 42 show no change or only slight changes, it is determined that the vacuum performance of this batch of thermocouples under test is excellent and the inspection is qualified. Otherwise, it indicates that there are unqualified products in this batch of thermocouples under test, which can be identified by individual testing or batch testing in small quantities.

[0051] The working principle of this application embodiment is as follows:

[0052] By opening the corresponding ball valve 7 according to the number and installation position of the thermocouples to be tested, multiple sets of thermocouples to be tested are sequentially passed through the corresponding ball valve 7 and inserted into the vacuum chamber 2, ensuring that the thermocouples to be tested are tightly sealed against the flange surface of the ball valve 7 on the side away from the vacuum chamber 2. Then, clamps are used to secure the thermocouples to be tested to the ball valve 7, thus ensuring that the thermocouples and the flange surface of the ball valve 7 remain sealed during the measurement process. Next, the vacuum pump 8 is turned on to start working. When the readings of vacuum gauge 41 and resistance vacuum gauge 42 both reach the set values, the power switch of vacuum pump 8 is turned off, and the exhaust pipe 6 is closed through control valve 62 to keep the vacuum chamber 2 sealed. After waiting for 5 minutes, the readings of vacuum gauge 41 and resistance vacuum gauge 42 are observed again. If the readings of vacuum gauge 41 and resistance vacuum gauge 42 do not change or only change slightly, it is judged that the vacuum performance of this batch of thermocouples to be tested is excellent and the inspection is qualified.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A thermocouple vacuum group detection device, characterized in that: The device includes a mounting frame (1), on which a vacuum chamber (2) is provided. Multiple sets of ball valves (7) are provided at both ends of the vacuum chamber (2). When the multiple sets of ball valves (7) are closed, the vacuum chamber (2) is sealed. A vacuum pump (8) is provided on the mounting frame (1) to provide a vacuum environment for the vacuum chamber (2). When the ball valves (7) are open, it is convenient for the thermocouple to be tested to pass through and be inserted into the vacuum chamber (2). A clamp is provided on the mounting frame (1) to fix and seal the thermocouple to be tested on the ball valves (7). A detection component (4) is provided on the vacuum chamber (2) to detect the vacuum value inside the vacuum chamber (2).

2. The thermocouple vacuum group detection device according to claim 1, characterized in that: Multiple sets of ball valves (7) on both ends of the vacuum chamber (2) are staggered, and the positions of multiple sets of thermocouples to be tested inserted into the vacuum chamber (2) through the ball valves (7) are staggered.

3. The thermocouple vacuum group detection device according to claim 1, characterized in that: The detection component (4) includes: Vacuum gauge (41), the vacuum gauge (41) is installed on the vacuum chamber (2) and communicates with the inside of the vacuum chamber (2), the vacuum gauge (41) is used to detect the vacuum value inside the vacuum chamber (2); A resistance vacuum gauge (42) is installed on the vacuum chamber (2) and used to detect the vacuum value of the vacuum chamber (2).

4. The thermocouple vacuum group detection device according to claim 1, characterized in that: The mounting bracket (1) is provided with multiple sets of fixing components (3) for detachably fixing the vacuum chamber (2). The multiple sets of fixing components (3) are spaced apart along the length of the vacuum chamber (2). The fixing components (3) include: Support base (31), which is mounted on the mounting frame (1) and used to support and fix the bottom of the vacuum chamber (2); A clamping clamp (32) is provided, which bypasses the vacuum chamber (2) and slides on the support base (31). The clamping clamp (32) clamps the vacuum chamber (2) onto the support base (31). Fixing bolt (33) is rotatably mounted on support base (31) and used to thread the two ends of clamping clamp (32).

5. The thermocouple vacuum group detection device according to claim 4, characterized in that: The clamping clamp (32) includes: U-shaped tube (321), said U-shaped tube (321) abuts against the end of the vacuum chamber (2) away from the support (31); Locking rods (322), two sets of locking rods (322) are set on both ends of the U-shaped tube (321), the locking rods (322) pass through the support base (31) and are threadedly connected to the fixing bolts (33); A locking bolt (323) is threaded on a locking rod (322) and is used to abut against a support (31) to lock the position of the locking rod (322).

6. The thermocouple vacuum group detection device according to claim 1, characterized in that: The vacuum chamber (2) is detachably connected to the ball valve (7) via a connecting assembly (5), the connecting assembly (5) comprising: A connecting pipe (51) is sealed on the end face of the vacuum chamber (2) and communicates with the inside of the vacuum chamber (2); The flange (52) is located on the end of the connecting pipe (51) away from the vacuum chamber (2). The flange (52) has an annular groove on the side near the ball valve (7). A sealing ring is provided in the annular groove. The flange (52) and the flange face of the ball valve (7) are pressed against each other and sealed by the sealing ring.

7. The thermocouple vacuum group detection device according to claim 6, characterized in that: The vacuum pump (8) is connected to the inside of the vacuum chamber (2) through the exhaust pipe (6) and is used to adjust the vacuum value inside the vacuum chamber (2). The exhaust pipe (6) is threadedly connected to the vacuum pump (8) through the connector (61). A control valve (62) for controlling the opening and closing of the exhaust pipe (6) is provided on the side of the exhaust pipe (6) near the vacuum chamber (2).

8. The thermocouple vacuum group detection device according to claim 1, characterized in that: The mounting frame (1) is provided with a placement platform (11) for placing the vacuum pump (8). The placement platform (11) is vertically offset from the vacuum chamber (2). The bottom of the mounting frame (1) is provided with multiple sets of suction nozzles to improve the connection strength between the mounting frame (1) and the ground.

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