NTC temperature sensor air tightness testing device and method

Abstract

The present invention belongs to the technical field of air tightness testing, and in particular discloses an NTC temperature sensor air tightness testing device and method. The NTC temperature sensor air tightness testing device includes a test bench for placing a test component for performing air tightness testing on the sensor body; the test component includes: a transmission component for transmitting gas to and extracting gas from the interior of the sensor body; a connector mounted on the outside of the transmission component; and a limiting component for limiting the bottom of the sensor body. The present invention defines the sensor body by cooperating with the transmission component and the placement rack, introduces gas into the interior of the sensor body, detects changes in the air pressure inside the sensor body in real time, calculates the leakage amount through formula conversion, and thereby detects whether the air tightness of the sensor body is qualified. The system can continuously test multiple sensor bodies on the turntable, thereby improving detection efficiency and reducing detection costs.

Description

Technical Field

[0001] The invention belongs to the technical field of air tightness testing, and in particular relates to an air tightness testing device and method for an NTC temperature sensor. Background Art

[0002] The new NTC sensor meets the ultra-high long-term stability requirements of new energy vehicle applications and is rated for an operating temperature range of -40°C to +125°C. The sensor has passed relevant weathering, chemical, and mechanical shock tests and exhibits excellent, long-term electrical strength, effectively preventing equipment damage.

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

[0004] In response to the above problems, the present invention provides an NTC temperature sensor air tightness testing device and method to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An NTC temperature sensor air tightness test device comprises: a test bench for placing a test component for performing air tightness testing on a sensor body; the test component comprises: a transmission component for transmitting and extracting gas from the interior of the sensor body; a connector mounted on the outside of the transmission component; a limiting component for limiting the bottom of the sensor body; a transmission cylinder disposed within the transmission component, a clamping component surrounding the bottom of the transmission cylinder, and a connecting pipe mounted on the top of the transmission cylinder; a clamping component for clamping the top opening of the sensor body; and a driving component for driving the transmission component toward or away from the sensor body.

[0007] Furthermore, the clamping component includes: a pressure frame, the number of which is set to be multiple and equidistantly surrounded by the bottom side of the transmission cylinder; a side frame, the number of which is set to be multiple and the multiple side frames correspond one-to-one to the multiple pressure frames, and the pressure frame is slidably connected to the inner side of the side frame; a first elastic member, used to pull the pressure frame away from the sensor body; and a pressing component, used to drive the pressure frame close to the sensor body.

[0008] Furthermore, each of the pressing components includes: a pressure rod connected to the outer side of the pressure frame and passing through the side frame; a pressure block, used to enable the pressure rod to drive the pressure frame close to the sensor body; an annular inclined surface, used to enable the pressure block to move up and down on the inner wall of the annular inclined surface; a first arc plate and a second arc plate, used to seal the gap between two adjacent pressure frames.

[0009] Furthermore, the limiting component includes: a placement rack for placing the bottom of the sensor body; a ring groove, opened on the outer side of the sensor body; a pressure strip, used to be clamped inside the ring groove on the surface of the sensor body; and a locking component for limiting the pressure strip.

[0010] Furthermore, the locking component includes: a slider, which is slidably placed inside the inner groove of the placement rack, and the pressure strip is connected to the inner side of the slider; a wedge block, which is used to drive the slider close to the sensor body; a second elastic member, which is connected to the top of the wedge block and drives the wedge block to move downward; a vertical rod, which is connected to the top surface of the wedge block and passes through the top of the inner groove.

[0011] Furthermore, the inner side surface of the wedge block and the outer side surface of the slider are both inclined, so that the slider can be moved closer to or away from the sensor body by means of dislocation.

[0012] Furthermore, the driving component is used to drive the transmission component to squeeze the top of the vertical rod to provide a pressing force for locking the pressure strip.

[0013] The present invention also provides a method for testing the air tightness of an NTC temperature sensor. The method is applied to the above-mentioned NTC temperature sensor air tightness testing device and comprises the following steps:

[0014] S1. Place the sensor body on top of the limiting component, and the limiting component preliminarily limits the sensor body;

[0015] S2. The driving component drives the transmission component close to the sensor body until the clamping component at the bottom of the transmission cylinder clamps the top opening of the sensor body. The air pump introduces gas into the sensor body through the connector and the transmission cylinder until the pressure inside the sensor body reaches the preset value.

[0016] S3. Maintaining the pressure of the sensor body and detecting the pressure change inside the sensor body through the air pressure sensor. After the detection is completed, the gas inside the sensor body is discharged;

[0017] S4. The driving component drives the transmission component away from the sensor body, and then detects the next sensor body.

[0018] Technical effects and advantages of the present invention:

[0019] 1. The present invention defines the sensor body through the cooperation of a transmission part and a placement rack, introduces gas into the interior of the sensor body, detects the air pressure changes inside the sensor body in real time, calculates the leakage amount through formula conversion, and thus detects whether the air tightness of the sensor body is qualified. It can continuously detect multiple sensor bodies on the turntable, improves detection efficiency, and reduces detection costs.

[0020] 2. The present invention cooperates with the pressing component and the clamping component to facilitate the cooperation of multiple groups of first arc plates and second arc plates to seal the gap between two adjacent pressing frames, avoid air leakage outside the connection port, and reduce the error of the sensor body during the air tightness detection process.

[0021] 3. The present invention limits the vertical rod through the pressure of the transmission member, provides a pressing force for locking the pressure strip, ensures the stability of the sensor body on the top of the placement rack, and avoids the sensor body from being offset during the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 1 is an overall schematic diagram of an NTC temperature sensor air tightness testing device according to an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of a transmission member and a placement rack defining a sensor body according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the top of the sensor body of an embodiment of the present invention being plugged into the bottom of the transmission element;

[0025] Figure 4 is a schematic cross-sectional perspective diagram of a transmission component according to an embodiment of the present invention;

[0026] Figure 5 1 is an overall schematic diagram of a press frame according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of a sensor body according to an embodiment of the present invention, with the bottom portion thereof placed on top of a placement rack;

[0028] Figure 7 is a schematic cross-sectional perspective view of a placement rack according to an embodiment of the present invention;

[0029] Figure 8 is an overall schematic diagram of a slider according to an embodiment of the present invention;

[0030] Figure 9 is an airtightness test judgment curve diagram of an embodiment of the present invention;

[0031] In the figure: 1. test bench; 101. turntable; 2. sensor body; 201. connection port; 202. ring plate; 3. transmission member; 4. connector; 5. transmission cylinder; 501. side groove; 6. connecting pipe; 7. pressure frame; 701. baffle; 8. side frame; 801. inner rod; 9. first elastic member; 10. pressure rod; 11. pressure block; 111. arc surface; 12. annular inclined surface; 13. first arc plate; 14. second arc plate; 15. placement frame; 16. ring groove; 17. pressure strip; 18. slider; 181. outer inclined surface; 19. wedge block; 191. inner inclined surface; 20. second elastic member; 21. vertical rod. DETAILED DESCRIPTION

[0032] In order to make the purpose, 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.

[0033] Example 1: The present invention provides an NTC temperature sensor airtightness test device, such as Figures 1 to 3 As shown, it includes a test bench 1, which is configured as a rectangular structure as a whole. A test component is placed on the top of the test bench 1, and the test component is installed on the top of the turntable 101. The bottom of the turntable 101 is connected to the motor output end. When the motor works, the motor output end causes the turntable 101 to drive the test component to rotate.

[0034] The sensor body 2 is configured as an NTC temperature sensor.

[0035] Among them, the test components include: a transmission part 3, a connector 4, a limiting part, a transmission tube 5, a clamping part, a connecting pipe 6 and a driving part. The transmission part 3 is arranged vertically, and the driving part can be set as a cylinder, and the top of the transmission part 3 is connected to the cylinder output end. The driving part is installed on the top of the test bench 1 through a bracket, and the sensor body 2 is placed on the top of the turntable 101 through the limiting part. The rotating turntable 101 drives the sensor body 2 to rotate through the limiting part until the rotating sensor body 2 moves to the bottom of the transmission part 3, and the motor stops working. At this time, the cylinder works to make the transmission part 3 close to the sensor body 2, and the downward transmission part 3 makes the clamping part at the bottom of the transmission tube 5 sleeved on the top opening of the sensor body 2.

[0036] Among them, the sensor body 2 includes a connecting port 201 and a ring plate 202 surrounding the outside of the connecting port 201. The bottom end of the transmission cylinder 5 is sleeved on the outside of the connecting 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 downward-moving transmission cylinder 5 contacts the ring plate 202, the ring plate 202 limits the bottom of the transmission cylinder 5. At this time, the downward-moving transmission part 3 cooperates with the transmission cylinder 5 to squeeze the connecting tube 6, and the clamping part cooperates to seal the connecting port 201 to avoid a gap between the outer surface of the circumference of the connecting port 201 and the transmission cylinder 5.

[0037] To allow the transmission cylinder 5 to move within the transmission member 3, the connecting tube 6 is configured as a bellows. The bottom end of the downwardly moving transmission member 3 is sheathed against the outside of the sensor body 2. The air pump output is connected to the connector 4 via a hose, and the hose is equipped with a pressure gauge and an air pressure valve. When the air pressure valve is opened and the air pump operates, the air pump output draws air into the connector 4 through the hose. The air then flows through the connector 4 and the transmission member 3 into the connecting tube 6. The air then flows into the sensor body 2 through the connection port 201 within the transmission cylinder 5. The pressure gauge indicates that the air pressure inside the sensor body 2 has reached a preset value, and the air pressure valve is closed.

[0038] After the sensor body 2 is pressure-maintained, the pressure change inside the sensor body 2 is detected in real time by the air pressure sensor. The leakage volume per unit time under standard conditions can be calculated according to the formula Q=Ve×(ΔP / 1.013×10^5)×(60 / T).

[0039] Where Q is the leakage rate (usually expressed 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 test time (in seconds). If the atmospheric pressure during the test is standard atmospheric pressure (i.e., 1.013 × 10^5 Pa) and the air temperature is 20°C, the above formula can be used to directly calculate the leakage rate per unit time under standard conditions.

[0040] The air pressure sensor transmits the air pressure change signal to the display screen in real time. The display screen receives the air pressure change signal and converts it into an air pressure change curve graph, such as Figure 9 As shown, the display screen shows the air pressure change in real time, and the air tightness of the sensor body 2 is judged according to the preset parameter range. If the test result meets the parameter range of the preset set value, it is judged to be airtight and the display result is "OK". If it fails, it is displayed as "NG".

[0041] After the air tightness test of the sensor body 2 is completed, the driving component works, and the output end of the driving component causes the transmission part 3 to move upward. The upward transmission part 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 causes the turntable 101 to drive the sensor body 2 to rotate until the next sensor body 2 is at the bottom of the transmission part 3, which is convenient for sequential testing of multiple sensor bodies 2 on the top of the turntable 101.

[0042] In order to block the connection port 201 on the top of the sensor body 2, the connection port 201 is clamped by a clamping component. Figures 3 to 5 In the figure, the clamping parts include: a pressure frame 7, a side frame 8, a first elastic member 9 and a pressing member. Multiple side frames 8 are equidistantly arranged around the outside of the bottom of the transmission cylinder 5. Multiple pressure frames 7 correspond to multiple 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 an inner concave surface, and the inner concave surface of the pressure frame 7 fits the outer side surface of the circumference of the connecting port 201. Two parallel inner rods 801 are set inside the side frame 8. The inner end of the inner rod 801 passes through the pressure frame 7. The pressure frame 7 slides inside the side frame 8 using the inner rod 801. At this time, the outer side surface of the pressure frame 7 is connected to the inner wall of the side frame 8 using the first elastic member 9. The first elastic member 9 is sleeved on the surface of the inner rod 801. The inner end of the inner rod 801 is connected with a circular plate, and the inner side surface of the pressure frame 7 is provided with a groove corresponding to the circular plate.

[0043] In this embodiment, when the bottom of the transmission member 3 is not sleeved on the outside of the connecting port 201, the elastic force of the first elastic member 9 pulls the pressure frame 7 into the inside of the side frame 8, and 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 end of the inner rod 801.

[0044] When the bottom end of the downward-moving transmission member 3 is sleeved on the surface of the connecting port 201 by means of the clamping member, the pressing member makes the pressure frame 7 approach the connecting port 201. When the inward-moving pressure frame 7 slides on the surface of the inner rod 801, the pressure frame 7 pulls the first elastic member 9 on the surface of the inner rod 801 until the inner concave surface of the pressure frame 7 fits against the outer side surface of the circumference of the connecting port 201. At this time, the circular plate at the inner end of the inner rod 801 enters the groove of the pressure frame 7. Multiple pressure frames 7 surround the outer side of the connecting port 201. By clamping multiple pressure frames 7, the connection port 201 at the top of the sensor body 2 is limited.

[0045] In order to seal the gap between the transmission tube 5 and the connecting port 201, the pressing component is used to make the pressure frame 7 drive the first arc plate 13 and the second arc plate 14 close to the connecting port 201. Each pressing component includes: a pressure rod 10, a pressure block 11, an annular inclined surface 12, a first arc plate 13 and a second arc plate 14. The pressure rod 10 is located between the two inner rods 801. The inner end of the pressure rod 10 is connected to the outer side surface of the pressure frame 7. The first arc plate 13 and the second arc plate 14 are fixed at both ends of the inner side of the pressure frame 7 respectively. The center of the concave surface of the first arc plate 13, the pressure frame 7 and the second arc plate 14 coincide. The outer end of the pressure rod 10 passes through the outer end of the side frame 8. The outer end of the pressure rod 10 is connected to the inner side surface of the pressure block 11, and the outer side surface of the pressure block 11 is set to an arc surface 111. The arc surface 111 of the pressure block 11 is in contact with the annular inclined surface 12 inside the transmission tube 5. The inner wall of the transmission tube 5 is provided with a side groove 501 corresponding to the first arc plate 13 and the second arc plate 14.

[0046] When the downward-moving transmission member 3 causes the transmission tube 5 to be sleeved on the surface of the connection port 201, and when the bottom surface of the transmission tube 5 fits with the top surface of the ring plate 202, the ring plate 202 limits the transmission tube 5, and the transmission member 3 that continues to move downward moves downward on the outside of the transmission tube 5. The transmission member 3 uses the annular inclined surface 12 to move downward on the outer side of the arc surface 111. Since the annular inclined surface 12 is inclined from bottom to top toward the direction of the transmission tube 5, the downward-moving annular inclined surface 12 squeezes the arc surfaces 111 of multiple pressure blocks 11, and the squeezed pressure blocks 11 use the pressure rod 10 to drive the pressure frame 7 to approach the connection port 201.

[0047] The outer ends of the first arc plate 13 and the second arc plate 14 are both connected to a baffle 701. The bottom surface of the baffle 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 baffle 701 connected to the second arc plate 14 is flush with the top surface of the first arc plate 13. When multiple pressure frames 7 approach the connecting port 201 synchronously, the two adjacent pressure frames 7 approach each other, and the first arc plate 13 and the second arc plate 14 are dislocated and moved until the inner concave surface of the pressure frame 7 is attached to the outer side surface of the circumference of the connecting port 201. At this time, the inner concave surfaces of the first arc plate 13 and the second arc plate 14 are attached to the outer side surface of the circumference of the connecting port 201. At this time, the pressing component cooperates with the clamping component to facilitate multiple groups of first arc plates 13 and second arc plates 14 to cooperate in sealing the gap between the two adjacent pressure frames 7, thereby avoiding air leakage on the outside of the connecting port 201 and reducing the error of the sensor body 2 during the air tightness detection process.

[0048] 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 component of the turntable 101. Figures 6 to 8 In the figure, the limiting components include: a placement frame 15, an annular groove 16, a pressure strip 17 and a locking component that limits the pressure strip 17. The bottom of the placement frame 15 is installed on the top of the turntable 101 by multiple bolt components. A slot corresponding to the sensor body 2 is provided on the top of the placement frame 15. When the bottom of the sensor body 2 is inserted into the slot, the outer circumferential surface of the sensor body 2 fits with the inner wall of the slot until the annular groove 16 of the sensor body 2 corresponds to the pressure strip 17. The locking component limits the pressure strip 17, and is clamped in the annular groove 16 by two opposite pressure strips 17 to ensure the stability of the bottom of the sensor body 2 on the top of the placement frame 15.

[0049] In order to define the bottom of the sensor body 2, an adaptive placement rack 15 is selected according to the shape of the sensor body 2, and the transmission member 3 cooperates with the locking member to complete the definition of the pressure strip 17. The pressure strip 17 is set to rubber material. Figures 6 to 8 In the embodiment, the locking components include: a slider 18, a wedge 19, a second elastic member 20 and a vertical rod 21. The second elastic member 20 is set as a spring sheet. The slider 18 is connected to the outer side surface of the pressure strip 17. The inner end of the pressure strip 17 extends into the slot through the inner groove. The wedge 19 is placed inside the inner groove. The inner side surface of the wedge 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 bevel 181, and the inner side surface of the wedge 19 is set as an inner bevel 191. The top 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 19. The elastic force of the second elastic member 20 makes the outer bevel 181 fit the inner bevel 191, and the top of the vertical rod 21 is at the top surface of the placement rack 15.

[0050] When the sensor body 2 is placed inside the slot, the sensor body 2 will first contact the pressure strip 17. The pressure of the sensor body 2 on the pressure strip 17 causes the pressure strip 17 to enter the inner groove. The outward-moving pressure strip 17 causes the slider 18 to slide inside the inner slope 191 using the outer slope 181. The outward-moving slider 18 causes the wedge block 19 to move upward, and the upward-moving wedge block 19 squeezes the second elastic member 20; until the inner end of the pressure 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, and the downward-moving wedge block 19 causes the slider 18 to move inward. The inward-moving slider 18 causes the inner end of the pressure strip 17 to enter the inner groove 16, and the preliminary limitation of the sensor body 2 is completed by the elastic force of the second elastic member 20.

[0051] The driving component makes the transmission member 3 approach the sensor body 2, and the bottom surface of the downwardly moving transmission member 3 contacts the top of the vertical rod 21. The transmission member 3 that continues to move downward causes the vertical rod 21 to move downward inside the inner groove. The downwardly moving vertical rod 21 causes the wedge block 19 to squeeze the slider 18. The inward movement of the slider 18 increases the squeezing force of the pressure strip 17 on the annular groove 16. The pressure strip 17 deforms under the action of pressure until the bottom surface of the transmission member 3 is in contact with the top surface of the placement frame 15. The vertical rod 21 is limited by the pressure of the transmission member 3, providing a pressing force for locking the pressure strip 17, ensuring the stability of the sensor body 2 on the top of the placement frame 15, and avoiding the displacement of the sensor body 2 during the detection process.

[0052] When the driving component moves the transmission member 3 away from the sensor body 2, the deformed pressure strip 17 moves the slider 18 away from the connection port 201, and the slider 18 pushes the wedge block 19 upward, so that the top of the vertical rod 21 fits with the bottom surface of the transmission member 3 until the transmission member 3 is separated from the vertical rod 21. At this time, the elastic force of the second elastic member 20 can enable the pressure strip 17 to initially limit the sensor body 2, thereby achieving the relaxation of the pressure strip 17.

[0053] Example 2: The present invention also provides a method for testing the air tightness of an NTC temperature sensor, referring to Figures 1 to 9 As shown, the method is applied to the above-mentioned NTC temperature sensor air tightness test device, including the following steps: S1, placing 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 component 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, and the air pump introduces gas into the sensor body 2 through the connector 4 and the transmission cylinder 5 until the inside of the sensor body 2 reaches a preset pressure value; S3, performing pressure maintenance treatment on the sensor body 2, and detecting the air pressure change inside the sensor body 2 through the air pressure sensor. After the detection is completed, the gas inside the sensor body 2 is discharged; S4, the driving component drives the transmission component 3 away from the sensor body 2, and then detects the next sensor body 2.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. An NTC temperature sensor air tightness test device, characterized in that: include: A test bench (1) is used to place a test component for performing airtightness testing on a sensor body (2); The test components include: A transmission member (3) for transmitting gas to and extracting gas from the interior of the sensor body (2); A connector (4) is mounted on the outside of the transmission member (3); A defining component, used for defining the bottom of the sensor body (2); A transmission cylinder (5) disposed inside the transmission member (3), a clamping component surrounding the bottom of the transmission cylinder (5), and a connecting pipe (6) installed on the top of the transmission cylinder (5); A clamping component, used for clamping the top opening of the sensor body (2); A driving component, used for driving the transmission member (3) to move closer to or away from the sensor body (2); The clamping component comprises: A press frame (7), wherein the press frames (7) are provided in a plurality and 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, the multiple side frames (8) correspond one-to-one to the multiple pressure frames (7), and the pressure frames (7) are slidably engaged with the inner sides of the side frames (8); a first elastic member (9) for pulling the pressing frame (7) away from the sensor body (2); A pressing component, used for driving the pressing frame (7) to approach the sensor body (2); The limiting components include: A placement rack (15) for placing the bottom of the sensor body (2); An annular groove (16) is provided on the outer circumferential surface of the sensor body (2); A pressure strip (17) is used for clamping inside the annular groove (16) on the surface of the sensor body (2); A locking component is used to define the pressure strip (17).

2. The NTC temperature sensor air tightness test device according to claim 1, characterized in that: Each of the pressing components comprises: A pressure rod (10) is connected to the outer side of the pressure frame (7), and the pressure rod (10) passes through the side frame (8); A pressure block (11) is used to enable the pressure rod (10) to drive the pressure frame (7) close to the sensor body (2); An annular inclined surface (12) is used to enable the pressing block (11) to move up and down on the inner side wall of the annular inclined surface (12); The first arc plate (13) and the second arc plate (14) are used to seal the gap between two adjacent pressing frames (7).

3. The NTC temperature sensor air tightness test device according to claim 2, characterized in that: The transmission member (3) reciprocates in the axial direction of the placement rack (15), thereby achieving locking and releasing of the pressure strip (17) by the locking component.

4. The NTC temperature sensor air tightness test device according to claim 3, characterized in that: The locking component comprises: a slider (18), a wedge (19), a second elastic member (20) and a vertical rod (21); the inner side surface of the wedge (19) and the outer side surface of the slider (18) are both inclined, so that the slider (18) is moved closer to or away from the sensor body (2) by means of dislocation.

5. The NTC temperature sensor air tightness test device according to claim 4, characterized in that: The driving component is used to drive the transmission member (3) to squeeze the top end of the vertical rod (21), thereby providing a pressing force for locking the pressure strip (17).

6. A method for testing the air tightness of an NTC temperature sensor, characterized in that: The NTC temperature sensor air tightness test device as claimed in claim 5 comprises the following steps: S1, placing 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 component (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), and the air pump introduces gas into the interior of the sensor body (2) through the connector (4) and the transmission cylinder (5) until the interior of the sensor body (2) reaches a preset pressure value; S3, performing a pressure-maintaining treatment on the sensor body (2), and detecting the pressure change inside the sensor body (2) by using an air pressure sensor, and after the detection is completed, discharging the gas inside the sensor body (2); S4. The driving component drives the transmission member (3) away from the sensor body (2), and then detects the next sensor body (2).

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