NTC (Negative Temperature Coefficient) temperature sensor air tightness testing device and method

Abstract

The invention belongs to the technical field of air tightness testing, and particularly discloses an NTC temperature sensor air tightness testing device and method. The NTC temperature sensor air tightness test device comprises a test bench used for placing a test part used for carrying out air tightness detection on a sensor body; the testing component comprises a transmission part used for transmitting gas into the sensor body and extracting gas; the connector is mounted on the outer side of the transmission piece; the limiting component is used for limiting the bottom of the sensor body. According to the invention, the transmission piece and the placing rack cooperate to limit the sensor body, introduce gas into the sensor body, detect the air pressure change in the sensor body in real time, and calculate the leakage amount through formula conversion, so as to detect whether the air tightness of the sensor body is qualified or not, and can continuously detect a plurality of sensor bodies on the rotary table. The detection efficiency is improved, and the detection cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of airtightness testing, and particularly relates to an airtightness testing device and method for an NTC temperature sensor. Background Art

[0002] The new NTC sensor can meet the ultra-high long-term stability requirements for new energy vehicle applications, and the rated operating temperature range is from -40°C to +125°C. The sensor passes relevant weather, chemical, and mechanical shock tests, and has excellent and long-term stable electrical strength, which can effectively prevent equipment damage.

[0003] The airtightness of the sensor is an important indicator to measure whether the pressure sensor can maintain normal operation. Once there is a problem with the airtightness, it will affect the normal operation of the pressure sensor detection. The traditional airtightness test bench is cumbersome to operate and requires high-precision detection equipment, resulting in high costs. Summary of the Invention

[0004] In view of the above problems, the present invention provides an airtightness testing device and method for an NTC temperature sensor to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solutions: An airtightness testing device for an NTC temperature sensor, comprising: a test bench for placing test components for detecting the airtightness of the sensor body; the test components include: a transmission member for transmitting gas into and extracting gas from the inside of the sensor body; a connector installed outside the transmission member; a limiting member for limiting the bottom of the sensor body; a transmission cylinder provided inside the transmission member, a clamping member surrounding the bottom of the transmission cylinder, and a connecting pipe installed at the top of the transmission cylinder; the clamping member for clamping the top opening of the sensor body; a driving member for driving the transmission member to approach or move away from the sensor body.

[0006] Further, the clamping member includes: a pressing frame, the number of pressing frames is set to be multiple and evenly surrounds the inside of the bottom side of the transmission cylinder; side frames, the number of side frames is set to be multiple, and the multiple side frames correspond to the multiple pressing frames one by one, and the pressing frame is slidably clamped inside the side frame; a first elastic member for pulling the pressing frame away from the sensor body; a pressing member for driving the pressing frame to approach the sensor body.

[0007] Further, each pressing member includes: a pressing rod connected to the outer side of the pressing frame and passing through the side frame; a pressing block for driving the pressing rod to drive the pressing frame to approach the sensor body; an annular inclined surface for enabling the pressing block to move up and down on the inner side wall of the annular inclined surface; a first arc plate and a second arc plate for blocking the gap between adjacent pressing frames.

[0008] Further, the limiting component includes: a placement rack for placing the bottom of the sensor body; an annular groove opened on the circumferential outer side of the sensor body; a pressing strip for clamping inside the annular groove on the surface of the sensor body; and a locking component for limiting the pressing strip.

[0009] Further, the locking component includes: a slider slidably placed inside the inner groove of the placement rack, with the pressing strip connected to the inner side of the slider; a wedge block for driving the slider to approach the sensor body; a second elastic member connected to the top of the wedge block and driving the wedge block to move downward; and a vertical rod connected to the top surface of the wedge block, with the vertical rod penetrating through the top of the inner groove.

[0010] Further, the inner side of the wedge block and the outer side of the slider are both inclined, and the slider approaches or moves away from the sensor body by means of misaligned movement.

[0011] Further, the driving component is used to drive the transmission member to squeeze the top of the vertical rod, providing a pressing force for locking the pressing strip.

[0012] The present invention also provides an NTC temperature sensor airtightness testing method, which is applied to the above-mentioned NTC temperature sensor airtightness testing device, and includes the following steps: S1. Place the sensor body on the top of the limiting component, and the limiting component preliminarily limits the sensor body. S2. The driving component drives the transmission member to approach the sensor body until the clamping component at the bottom of the transmission cylinder clamps the top opening of the sensor body, and the air pump passes gas into the sensor body through the connecting head and the transmission cylinder until the internal pressure of the sensor body reaches a preset pressure value. S3. Perform a pressure holding process on the sensor body, and detect the air pressure change inside the sensor body through the air pressure sensor. After the detection is completed, discharge the gas inside the sensor body. S4. The driving component drives the transmission member to move away from the sensor body, and then detect the next sensor body.

[0013] The technical effects and advantages of the present invention: 1. The present invention limits the sensor body through the cooperation of the transmission member and the placement rack, passes gas into the sensor body, and detects the air pressure change inside the sensor body in real time. The leakage amount is calculated through formula conversion, so as to detect whether the airtightness of the sensor body is qualified. It can continuously detect multiple sensor bodies on the turntable, improving the detection efficiency and reducing the detection cost.

[0014] 2. The present invention facilitates the cooperation of multiple groups of first arc plates and second arc plates to block the gap between adjacent two pressing frames through the cooperation of the pressing component and the clamping component, avoiding air leakage outside the connection port and reducing the error of the sensor body during the airtightness detection process.

[0015] 3. The present invention defines the vertical rod through the pressure of the transmission member to provide a pressing force for the locking of the pressing strip, ensuring the stability of the sensor body on the top of the placement rack and avoiding the situation of the sensor body shifting during the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an overall schematic diagram of the airtightness test device for the NTC temperature sensor according to the embodiment of the present invention; Figure 2 is a schematic diagram of the transmission member and the placement rack defining the sensor body according to the embodiment of the present invention; Figure 3 is a schematic diagram of the top end of the sensor body being inserted into the bottom of the transmission member according to the embodiment of the present invention; Figure 4 is a three-dimensional sectional schematic diagram of the transmission member according to the embodiment of the present invention; Figure 5 is an overall schematic diagram of the pressing frame according to the embodiment of the present invention; Figure 6 is a schematic diagram of the bottom of the sensor body being placed on the top of the placement rack according to the embodiment of the present invention; Figure 7 is a three-dimensional sectional schematic diagram of the placement rack according to the embodiment of the present invention; Figure 8 is an overall schematic diagram of the slider according to the embodiment of the present invention; Figure 9 is a judgment curve graph of the airtightness test according to the embodiment of the present invention; In the figure: 1, test bench; 101, turntable; 2, sensor body; 201, connection port; 202, ring plate; 3, transmission member; 4, connection head; 5, transmission cylinder; 501, side groove; 6, communication pipe; 7, pressing frame; 701, blocking strip; 8, side frame; 801, inner rod; 9, first elastic member; 10, pressing rod; 11, pressing block; 111, arc surface; 12, annular inclined surface; 13, first arc plate; 14, second arc plate; 15, placement rack; 16, ring groove; 17, pressing strip; 18, slider; 181, outer inclined surface; 19, wedge block; 191, inner inclined surface; 20, second elastic member; 21, vertical rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0018] Embodiment 1: The present invention provides an airtightness test device for an NTC temperature sensor, as Figures 1 to 3As shown in the figure, it includes a test bench 1. The test bench 1 is integrally set as a cuboid structure. A test component is placed on the top of the test bench 1. The test component is installed on the top of a turntable 101. The bottom of the turntable 101 is connected to the output end of a motor. When the motor works, the output end of the motor causes the turntable 101 to drive the test component to rotate.

[0019] The sensor body 2 is set as an NTC temperature sensor.

[0020] Among them, the test component includes: a transmission piece 3, a connector 4, a limiting component, a transmission cylinder 5, a clamping component, a communicating pipe 6 and a driving component. The transmission piece 3 is vertically arranged. The driving component can be set as a cylinder, and the top end of the transmission piece 3 is drivingly connected to the output end of the cylinder. The driving component is installed on the top of the test bench 1 through a bracket. The sensor body 2 is placed on the top of the turntable 101 through the limiting component. The rotating turntable 101 drives the sensor body 2 to rotate through the limiting component until the rotating sensor body 2 moves to the bottom of the transmission piece 3, and the motor stops working. At this time, the cylinder works to make the transmission piece 3 approach the sensor body 2. The descending transmission piece 3 makes the clamping component at the bottom of the transmission cylinder 5 sleeved on the top opening of the sensor body 2.

[0021] Among them, the sensor body 2 includes a connection port 201 and a ring plate 202 surrounding the outside of the connection port 201. The bottom end of the transmission cylinder 5 is sleeved on the outside of the connection port 201. At this time, the bottom surface of the transmission cylinder 5 is in contact with the top surface of the ring plate 202. When the bottom end of the descending transmission cylinder 5 contacts the ring plate 202, the ring plate 202 limits the bottom of the transmission cylinder 5. At this time, the descending transmission piece 3 and the transmission cylinder 5 cooperate to squeeze the communicating pipe 6, and the clamping component cooperates to block the connection port 201 to prevent a gap from being generated between the circumferential outer surface of the connection port 201 and the transmission cylinder 5.

[0022] In order to make the transmission cylinder 5 move inside the transmission piece 3, the communicating pipe 6 is set as a corrugated pipe. At this time, the bottom end of the descending transmission piece 3 is sleeved on the outside of the sensor body 2. The output end of an air pump is connected to the connector 4 through a hose, and a pressure gauge and a pneumatic valve are respectively arranged on the hose. The pneumatic valve is opened, and the air pump works. The output end of the air pump passes air into the connector 4 through the hose. The air passes through the connector 4 and the transmission piece 3 and enters the communicating pipe 6. At this time, the air passes through the connection port 201 inside the transmission cylinder 5 and enters the sensor body 2. When it is known through the pressure gauge that the air pressure inside the sensor body 2 reaches the preset pressure value, the pneumatic valve is closed.

[0023] After the pressure holding treatment is carried out on the sensor body 2, the air pressure change inside the sensor body 2 is detected in real time through a pressure sensor. According to the formula Q = Ve×(ΔP / 1.013×10^5)×(60 / T), the leakage rate per unit time under standard conditions can be calculated.

[0024] Among them, Q is the leakage rate (usually in mL / min), Ve is the equivalent internal volume (in mL), ΔP is the differential pressure or pressure drop (in Pa), and T is the detection time (in s). If the atmospheric pressure during the test is the standard atmospheric pressure (i.e., 1.013×10^5 Pa) and the standard temperature is 20 °C, the leakage rate per unit time under standard conditions can be directly calculated using the above formula.

[0025] The pressure sensor transmits the pressure change signal to the display screen in real time. The display screen receives the pressure change signal and converts it into a pressure change curve graph, as Figure 9 shown, the pressure change condition is displayed in real time through the display screen, and the airtightness of the sensor body 2 is judged according to the preset parameter range. If the detection result meets the parameter range of the preset set value, it is determined that the airtightness is qualified, and the display result is "OK", otherwise it is displayed as "NG".

[0026] After the airtightness detection of the sensor body 2 is completed, the driving component works. The output end of the driving component moves the transmission piece 3 upward. The upward moving transmission piece 3 moves away from the sensor body 2, and the air inside the sensor body 2 is discharged. The motor works, and the output end of the motor makes the turntable 101 drive the sensor body 2 to rotate until the next sensor body 2 is at the bottom of the transmission piece 3, which is convenient for sequentially detecting multiple sensor bodies 2 on the top of the turntable 101.

[0027] In order to block the connection port 201 at the top of the sensor body 2, the connection port 201 is clamped by the clamping component. In Figures 3 to 5 it, the clamping component includes: a pressure frame 7, a side frame 8, a first elastic member 9 and a pressing component. A plurality of side frames 8 are equidistantly arranged around the outer side of the bottom of the transmission cylinder 5. A plurality of pressure frames 7 correspond to the plurality of side frames 8 one by one. The first elastic member 9 is set as a spring. The inner side surface of the pressure frame 7 is set as a concave surface, and the concave surface of the pressure frame 7 fits on the outer side surface of the circumference of the connection port 201. There are two parallel inner rods 801 arranged side by side inside the side frame 8. The inner side end of the inner rod 801 penetrates through the pressure frame 7, and the pressure frame 7 slides inside the side frame 8 by using the inner rod 801. At this time, the outer side surface of the pressure frame 7 is connected to the inner side wall of the side frame 8 by the first elastic member 9. The first elastic member 9 is sleeved on the surface of the inner rod 801. A circular plate is connected to the inner side end of the inner rod 801, and a groove corresponding to the circular plate is arranged on the inner side surface of the pressure frame 7.

[0028] In this embodiment, when the bottom of the transmission piece 3 is not sleeved on the outside of the connection port 201, the elastic force of the first elastic member 9 pulls the pressure frame 7 into the side frame 8. The moving pressure frame 7 slides on the inner rod 801, and the pressure frame 7 gradually moves away from the circular plate at the inner side end of the inner rod 801.

[0029] When the bottom end of the downwardly moved transmission member 3 is sleeved on the surface of the connection port 201 by using the clamping member, the pressing member causes the pressing frame 7 to approach the connection port 201. When the inwardly moved pressing frame 7 slides on the surface of the inner rod 801, the pressing frame 7 pulls the first elastic member 9 on the surface of the inner rod 801 until the concave surface of the pressing frame 7 fits on the outer circumferential surface of the connection port 201. At this time, the circular plate at the inner side end of the inner rod 801 enters into the groove of the pressing frame 7. A plurality of pressing frames 7 surround the outer side portion of the connection port 201. Through the clamping of the plurality of pressing frames 7, the limitation of the connection port 201 at the top of the sensor body 2 is completed.

[0030] In order to block the gap between the transmission cylinder 5 and the connection port 201, the pressing member causes the pressing frame 7 to drive the first arc plate 13 and the second arc plate 14 to approach the connection port 201. Each pressing member includes: a pressing rod 10, a pressing block 11, an annular inclined surface 12, a first arc plate 13 and a second arc plate 14. The pressing rod 10 is located between the two inner rods 801. The inner side end of the pressing rod 10 is connected to the outer side surface of the pressing frame 7. The first arc plate 13 and the second arc plate 14 are respectively fixed at both ends of the inner side portion of the pressing frame 7. The centers of the concave surfaces of the first arc plate 13, the pressing frame 7 and the second arc plate 14 coincide. The outer side end of the pressing rod 10 penetrates through the outer side end of the side frame 8. The outer side end of the pressing rod 10 is connected to the inner side surface of the pressing block 11, and the outer side surface of the pressing block 11 is set as an arc surface 111. The arc surface 111 of the pressing block 11 fits with the annular inclined surface 12 inside the transmission cylinder 5. The inner side wall of the transmission cylinder 5 is provided with side grooves 501 corresponding to the first arc plate 13 and the second arc plate 14.

[0031] When the downwardly moved transmission member 3 causes the transmission cylinder 5 to be sleeved on the surface of the connection port 201, when the bottom surface of the transmission cylinder 5 is in contact with the top surface of the ring plate 202, the ring plate 202 limits the transmission cylinder 5. The continuously downwardly moved transmission member 3 moves downward outside the transmission cylinder 5. The transmission member 3 moves downward on the outer side surface of the arc surface 111 by using the annular inclined surface 12. Since the annular inclined surface 12 is inclined towards the transmission cylinder 5 from bottom to top, the downwardly moved annular inclined surface 12 presses the arc surfaces 111 of the plurality of pressing blocks 11. The pressed pressing blocks 11 drive the pressing frame 7 to approach the connection port 201 by using the pressing rod 10.

[0032] Both the outer ends of the first arc plate 13 and the second arc plate 14 are connected with a stop bar 701. The bottom surface of the stop bar 701 connected to the first arc plate 13 is flush with the bottom surface of the second arc plate 14, and the top surface of the stop bar 701 connected to the second arc plate 14 is flush with the top surface of the first arc plate 13. When multiple pressing frames 7 approach the connection port 201 synchronously, two adjacent pressing frames 7 approach each other, and the first arc plate 13 and the second arc plate 14 undergo a dislocation movement until the concave surface of the pressing frame 7 fits against the outer circumferential surface of the connection port 201. At this time, the concave surfaces of the first arc plate 13 and the second arc plate 14 fit against the outer circumferential surface of the connection port 201. At this time, the pressing member and the clamping member cooperate to facilitate the cooperation of multiple groups of the first arc plate 13 and the second arc plate 14 to block the gap between two adjacent pressing frames 7, avoid air leakage outside the connection port 201, and reduce the error of the sensor body 2 during the airtightness detection.

[0033] Before the bottom end of the transmission member 3 is sleeved on the top of the sensor body 2, the sensor body 2 is placed on the limiting member of the turntable 101. In Figures 6 to 8 the limiting member includes: a placement rack 15, an annular groove 16, a pressing strip 17, and a locking member for limiting the pressing strip 17. The bottom of the placement rack 15 is installed on the top of the turntable 101 through a plurality of bolt members. The top of the placement rack 15 is provided with a slot corresponding to the sensor body 2. When the bottom of the sensor body 2 is inserted into the slot, the outer circumferential surface of the sensor body 2 fits against the inner side wall of the slot until the annular groove 16 of the sensor body 2 corresponds to the pressing strip 17. The locking member limits the pressing strip 17, and the two opposite pressing strips 17 cooperate to be clamped inside the annular groove 16 to ensure the stability of the bottom of the sensor body 2 on the top of the placement rack 15.

[0034] In order to limit the bottom of the sensor body 2, a suitable placement rack 15 is selected according to the shape of the sensor body 2. The transmission member 3 and the locking member cooperate to complete the limitation of the pressing strip 17. The pressing strip 17 is made of rubber. In Figures 6 to 8 the locking member includes: a slider 18, a wedge block 19, a second elastic member 20, and a vertical rod 21. The second elastic member 20 is set as a spring piece. The slider 18 is connected to the outer side surface of the pressing strip 17. The inner end of the pressing strip 17 extends into the slot through an inner groove. The wedge block 19 is placed inside the inner groove. The inner side surface of the wedge block 19 and the outer side surface of the slider 18 are both inclined. The outer side surface of the slider 18 is set as an outer inclined surface 181, and the inner side surface of the wedge block 19 is set as an inner inclined surface 191. The top end of the second elastic member 20 is connected to the inner top surface of the inner groove, and the bottom end of the second elastic member 20 is connected to the top surface of the wedge block 19. The elastic force of the second elastic member 20 makes the outer inclined surface 181 fit against the inner inclined surface 191, and the top end of the vertical rod 21 is located on the top surface of the placement rack 15.

[0035] When the sensor body 2 is placed inside the slot, the sensor body 2 will first contact the pressing strip 17. The pressure of the sensor body 2 on the pressing strip 17 causes the pressing strip 17 to enter the inner groove. The outward-moving pressing strip 17 causes the slider 18 to slide inside the inner slope 191 by means of the outer slope 181. The outward-moving slider 18 causes the wedge block 19 to move upward, and the upward-moving wedge block 19 presses the second elastic member 20; until the inner end of the pressing strip 17 corresponds to the annular groove 16, the elastic force of the second elastic member 20 causes the wedge block 19 to move downward. The downward-moving wedge block 19 causes the slider 18 to move inward, and the inward-moving slider 18 causes the inner end of the pressing strip 17 to enter the annular groove 16, and the preliminary limitation of the sensor body 2 is completed by the elastic force of the second elastic member 20.

[0036] The driving component causes the transmission member 3 to approach the sensor body 2. The bottom surface of the downward-moving transmission member 3 contacts the top end of the vertical rod 21. The continuously downward-moving transmission member 3 causes the vertical rod 21 to move downward inside the inner groove. The downward-moving vertical rod 21 causes the wedge block 19 to press the slider 18. By the inward movement of the slider 18, the pressing force of the pressing strip 17 on the annular groove 16 is increased. The pressing strip 17 deforms under the pressure until the bottom surface of the transmission member 3 fits against the top surface of the placement rack 15. The vertical rod 21 is limited by the pressure of the transmission member 3, providing a pressing force for the locking of the pressing strip 17, ensuring the stability of the sensor body 2 at the top of the placement rack 15 and preventing the sensor body 2 from shifting during the detection process.

[0037] When the driving component causes the transmission member 3 to move away from the sensor body 2, the deformed pressing strip 17 causes the slider 18 to move away from the connection port 201. The slider 18 pushes the wedge block 19 upward, causing the top end of the vertical rod 21 to fit against the bottom surface of the transmission member 3 until the transmission member 3 separates from the vertical rod 21. At this time, the elastic force of the second elastic member 20 can cause the pressing strip 17 to preliminarily limit the sensor body 2, realizing the relaxation of the pressing strip 17.

[0038] Embodiment 2: The present invention also provides an NTC temperature sensor airtightness testing method. Referring to Figures 1 to 9 as shown, the method is applied to the above-mentioned NTC temperature sensor airtightness testing device and includes the following steps: S1. Place the sensor body 2 on the top of the limiting component, and the limiting component preliminarily limits the sensor body 2; S2. The driving component drives the transmission member 3 to approach the sensor body 2 until the clamping component at the bottom of the transmission cylinder 5 clamps the top opening of the sensor body 2. The air pump passes gas into the sensor body 2 through the connecting head 4 and the transmission cylinder 5 until the internal pressure of the sensor body 2 reaches a preset pressure value; S3. Perform a pressure holding process on the sensor body 2 and detect the internal air pressure change condition of the sensor body 2 through the air pressure sensor. After the detection is completed, discharge the gas inside the sensor body 2; S4. The driving component drives the transmission member 3 to move away from the sensor body 2, and then detect the next sensor body 2.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. An airtightness testing device for an NTC temperature sensor, characterized in that, Comprising: A test bench (1) for placing test components for performing airtightness detection on the sensor body (2); The test components include: A transmission member (3) for transmitting gas inside the sensor body (2) and extracting gas; A connector (4) installed outside the transmission member (3); A limiting component for limiting the bottom of the sensor body (2); A transmission cylinder (5) provided inside the transmission member (3), a clamping component surrounding the bottom of the transmission cylinder (5), and a connecting pipe (6) installed at the top of the transmission cylinder (5); A clamping component for clamping the top opening of the sensor body (2); A driving component for driving the transmission member (3) to approach or move away from the sensor body (2).

2. The airtightness test device for an NTC temperature sensor according to claim 1, characterized in that: The clamping component includes: A pressing frame (7), the number of the pressing frames (7) is set to be multiple, and they are equidistantly surrounded inside the bottom side of the transmission cylinder (5); Side frames (8), the number of the side frames (8) is set to be multiple, and the multiple side frames (8) correspond to the multiple pressing frames (7) one by one, and the pressing frames (7) are slidably clamped inside the side frames (8); A first elastic member (9) for pulling the pressing frame (7) away from the sensor body (2); A pressing component for driving the pressing frame (7) to approach the sensor body (2).

3. The NTC temperature sensor airtightness testing device according to claim 2, wherein: Each pressing component includes: A pressing rod (10) connected to the outer side surface of the pressing frame (7), and the pressing rod (10) penetrates through the side frame (8); A pressing block (11) for causing the pressing rod (10) to drive the pressing frame (7) to approach the sensor body (2); An annular inclined surface (12) for causing the pressing block (11) to move up and down on the inner side wall of the annular inclined surface (12); A first arc plate (13) and a second arc plate (14) for blocking the gap between two adjacent pressing frames (7).

4. The NTC temperature sensor airtightness testing device according to claim 1, wherein: The limiting component includes: A placement rack (15) for placing the bottom of the sensor body (2); An annular groove (16) opened on the circumferential outer side surface of the sensor body (2); A pressing strip (17) for being clamped inside the annular groove (16) on the surface of the sensor body (2); A locking component for limiting the pressing strip (17).

5. The airtightness test device for the NTC temperature sensor according to claim 4, wherein: The transmission member (3) reciprocates in the axial direction of the placement rack (15) to realize the locking and relaxation of the locking component on the pressing strip (17).

6. The airtightness test device for an NTC temperature sensor according to claim 5, characterized in that: The inner side surface of the wedge block (19) and the outer side surface of the slider (18) are both inclined, and the slider (18) approaches or moves away from the sensor body (2) by means of misaligned movement.

7. The airtightness testing device for the NTC temperature sensor according to claim 5, characterized in that: The driving component is used to drive the transmission member (3) to squeeze the top end of the vertical rod (21) to provide a pressing force for the locking of the pressing strip (17).

8. A method for testing the airtightness of an NTC temperature sensor, characterized in that, Applied to the airtightness test device for an NTC temperature sensor as described in claim 1, including the following steps: S1. Place the sensor body (2) on top of the limiting component, and the limiting component preliminarily limits the sensor body (2). S2. The driving component drives the transmission part (3) to approach the sensor body (2) until the clamping component at the bottom of the transmission cylinder (5) clamps the top opening of the sensor body (2). The air pump passes gas into the sensor body (2) through the connector (4) and the transmission cylinder (5) until the internal pressure of the sensor body (2) reaches a preset pressure value. S3. Perform a pressure holding process on the sensor body (2), and detect the internal air pressure change condition of the sensor body (2) through a pressure sensor. After the detection is completed, discharge the gas inside the sensor body (2). S4. The driving component drives the transmission part (3) away from the sensor body (2), and then detects the next sensor body (2).

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