Refrigerant leak detector

Abstract

The refrigerant leak detector comprises a shell, an air exhaust mechanism and a miniature single chip microcomputer are arranged in the shell, an air inlet hole is formed in one end of the shell, a butt joint pipe is fixedly arranged on the inner circumferential wall of the air inlet hole, and an exhaust hole is formed in the position, corresponding to the air exhaust mechanism, of the shell; an analysis system is arranged in the micro single chip microcomputer; the air inlet is connected with a detection device through a connecting hose, the detection device comprises a detection shell, a sensor assembly and a protection assembly for protecting the sensor assembly, the sensor assembly comprises a sensor body and a sensor signal line, and the sensor body is electrically connected with a micro single-chip microcomputer in the shell through the sensor signal line; a sensor signal line extends into the shell from the connecting hose, one end, away from the sensor assembly, of the connecting hose is fixedly connected with a connecting pipe, the connecting pipe is communicated with the connecting hose, and the connecting pipe is in threaded connection with the butt joint pipe. The application has the effects of improving the detection speed, improving the detection precision and reducing the damage of the sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas detection, in particular to a refrigerant leak detector. BACKGROUND

[0002] A refrigerant leak detector is usually arranged in a refrigeration system, and the refrigerant leak detector comprises a detection device and an analysis system, the detection device is arranged at the front end of the detection device, a sensor for detecting the concentration of refrigerant in the gas is arranged inside the detection device, and a collection hole is arranged at the front end of the detection device. When working, the front end of the detection device is inserted into the detection position of the measured object, the sensor converts the detected gas concentration into an electrical signal and sends it to the analysis system, and the analysis system judges whether refrigerant leakage occurs according to whether the concentration value exceeds the set normal value.

[0003] The conventional refrigerant leak detector mostly adopts a free diffusion method to detect the gas concentration, and the detection speed is slow, and since the refrigerant leak detector often collides with the measured object, the sensor of the detection device is frequently impacted, and the sensor is easily damaged.

[0004] In order to solve the problem of sensor damage, the existing solution is to wrap a layer of foam buffer around the sensor, which reduces the probability of sensor damage, but in order to avoid the influence of the foam on the air intake, the volume of the detection device at the front end of the refrigerant leak detector is set to be relatively large, the detection device cannot enter some small holes, the detection range of the refrigerant detector is limited, and the foam easily hinders the gas circulation, reduces the detection speed, and since the foam itself has gaps, the gas may be dispersed into the gaps of the foam, which also affects the detection accuracy. SUMMARY

[0005] In order to improve the detection speed, improve the detection accuracy, and reduce the damage of the sensor, the present application provides a refrigerant leak detector.

[0006] The refrigerant leak detector provided by the present application adopts the following technical scheme: A refrigerant leak detector, comprising a shell, an air extraction mechanism and a micro single-chip microcomputer are arranged in the shell, an air inlet hole is arranged at one end of the shell, a butt joint pipe is fixedly arranged on the inner circumferential wall of the air inlet hole, and an air outlet hole is arranged on the shell at a position corresponding to the air extraction mechanism; the micro single-chip microcomputer is provided with an analysis system; The detection device is connected with a connecting hose at the air inlet hole, and the detection device comprises a detection shell, a sensor assembly and a protection assembly for protecting the sensor assembly, the sensor assembly comprises a sensor body and a sensor signal line, the sensor body is electrically connected with a micro single-chip microcomputer in the shell through the sensor signal line, the sensor signal line extends into the shell from the connecting hose, one end of the connecting hose away from the sensor assembly is fixedly connected with a connecting pipe, the connecting pipe is in communication with the connecting hose, and the connecting pipe is threadedly connected with a connecting pipe.

[0007] By using the above technical scheme, the measured gas is drawn into the shell from the detection device by the air extraction mechanism and discharged from the air outlet hole, the gas flow rate is improved, the detection speed is improved, the sensor assembly is protected by the protection assembly, and the damage of the sensor is reduced.

[0008] Preferably, the air extraction mechanism comprises a fan and a fan cover, the fan cover covers the fan, the air outlet hole is arranged on the air outlet side of the fan, the fan cover comprises four circumferential plates arranged around the fan and a top plate arranged on the air inlet side of the fan, the top plate is fixedly connected with the four circumferential plates, the top plate has an air inlet space on the air inlet side of the fan, a communication pipe is arranged on the circumferential plate close to the air inlet hole, the communication pipe is in communication with the inside of the fan cover, the communication pipe is inserted into and interference-fitted with the connecting pipe, and the connecting pipe is in communication with the communication pipe.

[0009] Preferably, a sealing ring groove is arranged on the outer circumferential wall of the communication pipe, and a sealing ring is embedded in the sealing ring groove, and the sealing ring is interference-fitted with the inner circumferential wall of the connecting pipe.

[0010] By using the above technical scheme, the rotation of the fan blade reduces the air pressure in the connecting hose and the detection device, so that the air flow automatically flows into the shell and is discharged from the air outlet hole, the gas flow rate is improved, the gas detection speed is improved, and the sealing property of the gas entering the shell is ensured through the cooperation of the connecting pipe, the communication pipe and the sealing ring.

[0011] Preferably, the air extraction mechanism comprises an air extraction pump, an air inlet pipe and an air outlet pipe, one end of the air inlet pipe is connected with and in communication with the air inlet end of the air extraction pump, the other end of the air inlet pipe is inserted into and interference-fitted with the connecting pipe, one end of the air outlet pipe is connected with and in communication with the air outlet end of the air extraction pump, the air outlet hole is arranged on the side wall of the shell close to the air inlet hole, and the other end of the air outlet pipe is arranged towards the air outlet hole.

[0012] By using the above technical scheme, the cooperation structure of the air extraction pump, the air inlet pipe and the air outlet pipe or the cooperation structure of the fan, the fan cover and the communication pipe can be used according to the actual situation, the gas is drawn into the shell from the detection device through the sensor assembly by the air extraction pump and discharged from the air outlet hole, the gas flow rate is improved, and the gas detection speed is improved.

[0013] Preferably, the detection shell comprises a base and an air inlet cap, the connecting hose is a metal hose, the air inlet cap is threadedly connected with the base, and the air inlet cap and the base have a containing space for containing the sensor assembly and the protection assembly; The air inlet cap comprises a narrow portion and an expanded portion, the narrow portion is provided with a collection hole, the collection hole is in communication with the containing space, and the expanded portion is connected with the base; The base is internally provided with a spring seat in the form of a ring, the bottom of the spring seat is internally provided with an annular step, the sensor body is arranged on the step, the end of the base away from the air inlet cap is threadedly connected with the end of the connecting hose away from the shell, the end of the base away from the air inlet cap is provided with a clearance hole for the sensor signal line to pass out, the clearance hole is in communication with the connecting hose, and the sensor signal line passes into the connecting hose from the clearance hole of the base.

[0014] Preferably, the bottom of the sensor body is coaxially connected with a ring plate, the outer peripheral wall of the ring plate is attached to the inner peripheral wall of the spring seat, and the outer peripheral wall of the sensor body and the inner peripheral wall of the spring seat have a first mounting gap; The protection assembly comprises an upper spring and a lower spring, the upper spring is sleeved on the sensor body and located in the first mounting gap, the bottom end of the upper spring is in abutment with the top surface of the ring plate, the top end of the upper spring is in abutment with the bottom surface of the narrow portion, the bottom of the base is provided with a second mounting gap for mounting the lower spring, the lower spring is arranged in the second mounting gap, the step bottom surface of the spring seat is coaxially connected with a ring of limit rings downward, the lower spring is sleeved outside the limit ring, the top end of the lower spring is in abutment with the bottom surface of the spring seat, and the bottom end of the lower spring is in abutment with the inner bottom wall of the second mounting gap; The sensor signal line passes through the clearance hole of the base from the bottom of the spring seat, and the length of the sensor signal line can allow the spring seat to move in the containing space.

[0015] By adopting the above technical scheme, when the detection device collides with the measured object, the spring seat moves between the upper spring and the lower spring, the collision force transmitted by the detection shell to the sensor body is reduced, the sensor body is protected, the collection end of the air inlet cap is a narrow portion, and the refrigerant detector can still enter some small holes without affecting the detection range of the refrigerant detector. Compared with the foam protection structure, through the cooperation of the spring seat, the upper spring and the lower spring, the sensor body is not only protected, but also does not affect the flow of gas and does not absorb the measured gas, thereby improving the detection speed and detection accuracy.

[0016] Preferably, one side of the shell provided with the air exhaust hole is provided with a dustproof plate, the air exhaust hole is provided with multiple rows along the width direction of the shell, and each row is provided with multiple air exhaust holes, the dustproof plate is provided in an inclined manner, the length of the dustproof plate is greater than the diameter of the air exhaust hole, the dustproof plate slides along the inclined direction, the dustproof plate corresponds to the air exhaust hole one by one, and the dustproof plate and the air exhaust hole have an air exhaust space therebetween.

[0017] Preferably, the dustproof plates in one row are synchronously moved through the connecting rod.

[0018] Preferably, a sliding plate is arranged between the two adjacent dustproof plates, the sliding plate is fixedly connected with the connecting rod, the inclination angle of the sliding plate is consistent with the inclination angle of the dustproof plate, a sliding groove for the sliding plate to slide is arranged on the wall of the shell of the sliding plate, the sliding groove penetrates through the bottom wall of the shell, the sliding plate slides in the sliding groove, the bottom surface of one end of the sliding groove is provided with an anti-falling block, the anti-falling block is triangular, an anti-falling groove for the anti-falling block to slide is arranged on the side wall of the sliding groove, and the anti-falling groove does not penetrate through the bottom wall of the shell.

[0019] Preferably, the top surface of one end of the sliding groove is provided with a limiting block, the length of the limiting block is greater than the width of the sliding plate, a limiting groove for the limiting block to slide is arranged on the side wall of the sliding groove, and the limiting groove does not penetrate through the bottom wall of the shell.

[0020] By adopting the above technical scheme, the dustproof plate can block the air exhaust hole in the largest area under the action of gravity, reduce the situation that dust enters the shell from the air exhaust hole, and also reduce the possibility that the dust blocks the air exhaust hole. When the gas is discharged from the air exhaust hole, the anti-falling block and the inner bottom wall of the anti-falling groove abut, and the limiting block and the inner bottom wall of the limiting groove abut. When the flow rate of the gas is small, the gas can be discharged from the air exhaust space between the dustproof plate and the air exhaust hole. When the flow rate of the gas is large, the gas can push the dustproof plate. The dustproof plate slides upward along the sliding groove through the sliding plate, so that the air exhaust space is larger, the air exhaust efficiency is automatically improved, dust prevention and air exhaust effect can be realized, and the dust prevention and air exhaust effect can be realized.

[0021] In summary, the present application has at least one of the following beneficial technical effects: 1. When the detection device collides with the measured object, the spring seat moves between the upper spring and the lower spring, reducing the collision force transmitted by the detection shell to the sensor body, thereby protecting the sensor body. The collection end of the air inlet cap is narrow, but it can still enter some smaller holes without affecting the detection range of the refrigerant detector. Compared with the foam protection structure, the spring seat, the upper spring and the lower spring cooperate to not only protect the sensor body, but also do not affect the flow of gas and will not absorb the measured gas, thereby improving the detection speed and detection accuracy. 2. When assembling the protection assembly, install the lower spring in the second installation gap of the base, pass the sensor signal line through the base, spring seat, connecting hose and into the shell to connect with the micro single-chip microcomputer, then place the sensor body in the spring seat, then press the spring seat with the sensor body on the lower spring, make the limiting ring in the lower spring, then place the upper spring in the first installation gap, and finally screw the air inlet cap and the base, which is convenient for assembling the protection assembly and the sensor assembly. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a whole cross-sectional structure schematic diagram of a refrigerant leak detector in the embodiment one of the present application.

[0023] Figure 2 is an explosion structure schematic diagram for showing the detection device in the embodiment one of the present application.

[0024] Figure 3 is a cross-sectional structure schematic diagram for showing the detection device in the embodiment one of the present application.

[0025] Figure 4 is a structure schematic diagram for showing Figure 1 the enlarged structure at A in the embodiment one of the present application.

[0026] Figure 5 is a whole cross-sectional structure schematic diagram of a refrigerant leak detector in the embodiment two of the present application.

[0027] Figure 6 is a structure schematic diagram for showing the dustproof plate in the embodiment three of the present application.

[0028] Figure 7 is a cross-sectional structure schematic diagram for showing the dustproof plate and the exhaust space in the embodiment three of the present application.

[0029] Figure 8 is a cross-sectional structure schematic diagram for showing the sliding plate and the sliding groove in the embodiment three of the present application.

[0030] Explanation of reference signs: 1, shell; 11, air inlet hole; 12, air outlet hole; 13, partition; 14, key panel; 15, display screen; 16, sliding groove; 17, anti-falling groove; 18, limiting groove; 2, butt joint pipe; 3, microcontroller; 4, connecting hose; 41, connecting pipe; 5, detection device; 51, detection shell; 511, base; 5111, clearance; 5112, second installation gap; 512, air inlet cap; 5121, narrow part; 5122, outward expansion part; 5123, collection hole; 513, containing space; 52, sensor assembly; 521, sensor body; 5211, ring plate; 522, sensor signal line; 53, protection assembly; 531, spring seat; 5311, step; 5312, limiting ring; 5313, first installation gap; 532, upper spring; 533, lower spring; 6, fan; 61, fan cover; 611, circumferential side plate; 612, top plate; 613, air inlet space; 62, communication pipe; 621, sealing ring; 7, air suction pump; 71, air inlet pipe; 72, air outlet pipe; 8, dustproof plate; 81, connecting rod; 82, air outlet space; 9, sliding plate; 91, anti-falling block; 92, limiting block. DETAILED DESCRIPTION

[0031] The following will be described in detail in combination with the accompanying drawings. Figures 1-8 The application is further described in detail.

[0032] The application discloses a refrigerant leak detector.

[0033] Embodiment I Reference Figures 1-4 A refrigerant leak detector comprises a shell, an air suction mechanism and a microcontroller arranged in the shell, an air inlet hole arranged at one end of the shell, a butt joint pipe fixedly arranged on the inner circumferential wall of the air inlet hole, and an air outlet hole arranged on the shell corresponding to the position of the air suction mechanism; the microcontroller is provided with an analysis system for comparing gas concentration and judging whether refrigerant leakage occurs.

[0034] The detection device is connected to the air inlet hole through a connecting hose, and the detection device comprises a detection shell, a sensor assembly and a protection assembly for protecting the sensor assembly; the sensor assembly comprises a sensor body and a sensor signal line, the sensor body is electrically connected to the microcontroller in the shell through the sensor signal line, the sensor signal line extends into the shell from the connecting hose, one end of the connecting hose away from the sensor assembly is fixedly connected with a connecting pipe, the connecting pipe is in communication with the connecting hose, and the connecting pipe is threadedly connected with the butt joint pipe.

[0035] The detection shell comprises a base and an air inlet cap, the connecting hose is a metal hose, the air inlet cap is threadedly connected with the base, and the air inlet cap and the base have a containing space for containing the sensor assembly and the protection assembly.

[0036] The air inlet cap comprises a narrow part and an expanded part, the narrow part is provided with a collection hole, the collection hole is communicated with the accommodating space, and the expanded part is connected with the base.

[0037] The base is provided with a spring seat in the form of a ring, the bottom of the spring seat is inwardly provided with an annular step, the sensor body is arranged on the step, the end of the base away from the air inlet cap is threadedly connected with the end of the connecting hose away from the shell, the end of the base away from the air inlet cap is provided with a clearance hole for the sensor signal line to pass out, the clearance hole is communicated with the connecting hose, and the sensor signal line passes into the connecting hose from the clearance hole of the base.

[0038] The bottom of the sensor body is coaxially connected with a ring plate, the outer peripheral wall of the ring plate is attached to the inner peripheral wall of the spring seat, and the outer peripheral wall of the sensor body and the inner peripheral wall of the spring seat have a first mounting gap.

[0039] The protection assembly comprises an upper spring and a lower spring, the upper spring is sleeved on the sensor body and located in the first mounting gap, the bottom end of the upper spring is abutted against the top surface of the ring plate, the top end of the upper spring is abutted against the bottom surface of the narrow part, the bottom of the base is provided with a second mounting gap for mounting the lower spring, the lower spring is arranged in the second mounting gap, the step bottom surface of the spring seat is coaxially connected with a limiting ring downward, the lower spring is sleeved outside the limiting ring, the top end of the lower spring is abutted against the bottom surface of the spring seat, and the bottom end of the lower spring is abutted against the inner bottom wall of the second mounting gap. The sensor signal line passes through the clearance hole of the base from the bottom of the spring seat, and the length of the sensor signal line can allow the spring seat to move in the accommodating space.

[0040] When the detection device collides with the measured object, the spring seat moves between the upper spring and the lower spring, so as to reduce the collision force transmitted by the detection shell to the sensor body, thereby protecting the sensor body, and the collection end of the air inlet cap is the narrow part, which can still enter some small holes, without affecting the detection range of the refrigerant detector. Compared with the foam protection structure, through the cooperation of the spring seat, the upper spring and the lower spring, the sensor body is not only protected, but also does not affect the flow of gas and does not absorb the measured gas, thereby improving the detection speed and detection accuracy.

[0041] When assembling the protection assembly, the lower spring is mounted in the second mounting gap of the base, the sensor signal line passes through the base, the spring seat, the connecting hose and the shell, and is connected with the microcontroller, then the sensor body is placed in the spring seat, then the spring seat with the sensor body is pressed on the lower spring, so that the limiting ring is located in the lower spring, then the upper spring is placed in the first mounting gap, and finally the air inlet cap and the base are threadedly connected, so as to facilitate the assembly of the protection assembly and the sensor assembly.

[0042] The top surface of the shell is provided with a key panel and a display screen, the key panel is used for controlling the opening and closing of the fan, and the key panel and the display screen are electrically connected with the micro single-chip microcomputer in the shell, and the air pressure index and the result of whether the refrigerant leakage occurs can be seen through the display screen.

[0043] A partition plate is arranged in the shell, the partition plate is located between the key panel, the display screen and the air extraction mechanism, the partition plate is horizontally arranged, the outer peripheral wall of the partition plate is fixedly connected with the inner peripheral wall of the shell, the air inlet hole and the air outlet hole are located on the side of the air extraction mechanism, the partition plate separates the space where the micro single-chip microcomputer, the key panel and the display screen are located from the space where the air extraction mechanism is located, the air inlet hole and the air outlet hole are located in the space where the air extraction mechanism is located, so that the cold gas is prevented from damaging the micro single-chip microcomputer, and the partition plate is a circuit board, so that the electronic components such as the micro single-chip microcomputer, the key panel and the display screen are electrically connected with each other.

[0044] The air extraction mechanism comprises a fan and a fan cover, the fan cover covers the fan, the air outlet hole is arranged on the air exhaust side of the fan, the fan cover comprises four peripheral side plates arranged around the fan and a top plate arranged on the air inlet side of the fan, the top plate is fixedly connected with the four peripheral side plates, the top plate has an air inlet space on the air inlet side of the fan, a communication pipe is arranged on the peripheral side plate close to the air inlet hole, the communication pipe is in communication with the inside of the fan cover, the communication pipe is inserted into and in interference fit with the butt joint pipe, and the connecting pipe is in communication with the communication pipe. A sealing ring groove is arranged on the outer peripheral wall of the communication pipe, and a sealing ring is embedded in the sealing ring groove, and the sealing ring is in interference fit with the inner peripheral wall of the butt joint pipe.

[0045] The rotation of the blades of the fan reduces the air pressure in the connecting hose and the detection device, so that the airflow automatically flows into the shell and is discharged from the air outlet hole, the gas flow rate is improved, the gas detection speed is improved, and the sealing property of the gas entering the shell is ensured through the cooperation of the butt joint pipe, the communication pipe and the sealing ring.

[0046] The implementation principle of the refrigerant leakage detector in the embodiment one is as follows: the front end of the detection device is inserted into the detection position of the measured object, the fan is started and air is extracted through the key panel, the gas enters the detection shell from the collection hole, the sensor assembly converts the detected gas concentration into an electric signal and sends the electric signal to the analysis system of the micro single-chip microcomputer through the sensor signal line, and the analysis system judges whether the refrigerant leakage occurs according to whether the concentration value exceeds the set normal value.

[0047] Embodiment two Reference Figure 5, embodiment two and embodiment one are different, the air extraction mechanism includes an air extraction pump, an air inlet pipe, an air outlet pipe, one end of the air inlet pipe is connected with the air inlet end of the air extraction pump and communicates, the other end of the air inlet pipe is inserted into the butt joint pipe and is in interference fit with the butt joint pipe, one end of the air outlet pipe is connected with the air outlet end of the air extraction pump and communicates, the exhaust hole is arranged on the side wall of the shell close to the air inlet hole, and the other end of the air outlet pipe is arranged towards the exhaust hole. The cooperation structure of air extraction pump, air inlet pipe and air outlet pipe or the cooperation structure of fan, fan cover and communication pipe can be used according to the actual situation. The gas is extracted from the detection device through the sensor assembly by the air extraction pump and discharged from the exhaust hole, so that the gas flow rate is improved and the gas detection speed is improved.

[0048] Embodiment three Referring to Figures 6-8 , embodiment three and embodiment one are different, the side of the shell provided with the exhaust hole is provided with a dustproof plate, the exhaust holes are arranged in multiple rows along the width direction of the shell and multiple exhaust holes are arranged in each row, the dustproof plate is arranged obliquely, the length of the dustproof plate is greater than the hole diameter of the exhaust hole, the dustproof plate slides along the oblique direction of itself, the dustproof plate corresponds to the exhaust hole one by one, and the dustproof plate and the exhaust hole have an exhaust space therebetween. One row of dustproof plates moves synchronously through the connecting rod.

[0049] A sliding plate is arranged between the two adjacent dustproof plates, the sliding plate is fixedly connected with the connecting rod, the inclination angle of the sliding plate is consistent with the inclination angle of the dustproof plate, a sliding groove for the sliding plate to slide is formed in the wall of the shell of the sliding plate, the sliding groove penetrates through the bottom wall of the shell, the sliding plate slides in the sliding groove, the bottom surface of one end of the sliding groove is provided with an anti-falling block, the anti-falling block is triangular, and an anti-falling groove for the anti-falling block to slide is formed in the side wall of the sliding groove, the anti-falling groove does not penetrate through the bottom wall of the shell.

[0050] A limiting block is arranged on the top surface of one end of the sliding groove, the length of the limiting block is greater than the width of the sliding plate, a limiting groove for the limiting block to slide is formed in the side wall of the sliding groove, and the limiting groove does not penetrate through the bottom wall of the shell.

[0051] The dustproof plate blocks the exhaust hole with the largest area under the action of its own gravity, reduces the situation that dust enters the shell from the exhaust hole, and also reduces the possibility that the dust blocks the exhaust hole. When the gas is discharged from the exhaust hole, the anti-falling block abuts against the inner bottom wall of the anti-falling groove, and the limiting block abuts against the inner bottom wall of the limiting groove. When the flow rate of the gas is small, the gas can be discharged from the exhaust space between the dustproof plate and the exhaust hole. When the flow rate of the gas is large, the gas can push the dustproof plate, the dustproof plate slides obliquely upward along the sliding groove through the sliding plate, so that the exhaust space is larger, the exhaust efficiency is automatically improved, dust prevention and exhaust effect can be realized.

[0052] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A refrigerant leak detector characterized by: The utility model provides a kind of air sampling device, including shell (1), air extraction mechanism and microcontroller (3) are provided in the shell (1), one end of the shell (1) is provided with air inlet hole (11), the inner peripheral wall of air inlet hole (11) is fixedly provided with docking pipe (2), the position of air extraction mechanism on the shell (1) is provided with exhaust hole (12);Microcontroller (3) is provided with analysis system in it; Detection device (5) is connected by connecting hose (4) at air inlet hole (11), and the detection device (5) includes detection shell (51), sensor assembly (52) and protection assembly (53) for protecting sensor assembly (52), the sensor assembly (52) includes sensor body (521) and sensor signal line (522), the sensor body (521) is electrically connected with the microcontroller (3) in the shell (1) by sensor signal line (522), and the sensor signal line (522) extends into the shell (1) from the connecting hose (4), one end of the connecting hose (4) is fixedly connected with connecting pipe (41) away from sensor assembly (52), the connecting pipe (41) is communicated with connecting hose (4), and the connecting pipe (41) is screwed with docking pipe (2).

2. The leak detector of claim 1, wherein: The air extraction mechanism includes fan (6) and fan cover (61), the fan cover (61) covers fan (6) outside, the exhaust hole (12) is arranged on the exhaust side of fan (6), the fan cover (61) includes four circumferential plates (611) surrounding the circumferential side of fan (6) and top plate (612) located on the air inlet side of fan (6), the top plate (612) is fixedly connected with four circumferential plates (611), the top plate (612) has air inlet space (613) on the air inlet side of fan (6), and the circumferential plate (611) close to the side of air inlet hole (11) is provided with communication pipe (62), the communication pipe (62) is communicated with the inside of fan cover (61), the communication pipe (62) is inserted with docking pipe (2) and interference fit, and the connecting pipe (41) is communicated with communication pipe (62).

3. The leak detector of claim 2, wherein: The outer peripheral wall of the communication pipe (62) is provided with a sealing ring groove, and a sealing ring (621) is embedded in the sealing ring groove, and the sealing ring (621) is interference fit with the inner peripheral wall of the docking pipe (2).

4. The leak detector of claim 1, wherein: The air extraction mechanism includes air extraction pump (7), air inlet pipe (71) and air outlet pipe (72), one end of the air inlet pipe (71) is connected with the air inlet end of the air extraction pump (7) and communicated, the other end of the air inlet pipe (71) is inserted into the docking pipe (2) and interference fit with the docking pipe (2), one end of the air outlet pipe (72) is connected with the air outlet end of the air extraction pump (7) and communicated, the exhaust hole (12) is arranged on the position of the side wall of the shell (1) close to the air inlet hole (11), and the other end of the air outlet pipe (72) is arranged towards the exhaust hole (12).

5. The leak detector of claim 1, wherein: The detection shell (51) comprises a base (511) and an air inlet cap (512), the connecting hose (4) is a metal hose, the air inlet cap (512) is threadedly connected with the base (511), and the air inlet cap (512) and the base (511) have a containing space (513) for containing the sensor assembly (52) and the protection assembly (53); The air inlet cap (512) comprises a narrow portion (5121) and an outwardly expanded portion (5122), the narrow portion (5121) is provided with a collection hole (5123) in communication with the containing space (513), and the outwardly expanded portion (5122) is connected with the base (511); The base (511) is provided with a spring seat (531) in the form of a ring, the bottom of the spring seat (531) is inwardly provided with an annular step (5311), the sensor body (521) is arranged on the step (5311), one end of the base (511) away from the air inlet cap (512) is threadedly connected with one end of the connecting hose (4) away from the shell (1), the end of the base (511) away from the air inlet cap (512) is provided with a clearance hole (5111) for the sensor signal line (522) to pass through, the clearance hole (5111) is in communication with the connecting hose (4), and the sensor signal line (522) passes into the connecting hose (4) from the clearance hole (5111) of the base (511).

6. The leak detector of claim 5, wherein: The bottom of the sensor body (521) is coaxially connected with a ring plate (5211), the outer peripheral wall of the ring plate (5211) is attached to the inner peripheral wall of the spring seat (531), and the outer peripheral wall of the sensor body (521) and the inner peripheral wall of the spring seat (531) have a first mounting gap (5313); The protection assembly (53) comprises an upper spring (532) and a lower spring (533), the upper spring (532) is sleeved on the sensor body (521) and located in the first mounting gap (5313), the bottom end of the upper spring (532) abuts against the top surface of the ring plate (5211), the top end of the upper spring (532) abuts against the bottom surface of the narrow portion (5121), the bottom of the base (511) is provided with a second mounting gap (5112) for mounting the lower spring (533), the lower spring (533) is arranged in the second mounting gap (5112), the step (5311) of the spring seat (531) is coaxially connected with a limiting ring (5312) downward at the bottom, the lower spring (533) is sleeved outside the limiting ring (5312), the top end of the lower spring (533) abuts against the bottom surface of the spring seat (531), and the bottom end of the lower spring (533) abuts against the inner bottom wall of the second mounting gap (5112); The sensor signal line (522) passes through the clearance hole (5111) of the base (511) from the bottom of the spring seat (531), and the length of the sensor signal line (522) can allow the spring seat (531) to move in the containing space (513).

7. The leak detector of claim 1, wherein: The dustproof plate (8) is arranged on one side of the shell (1) provided with the exhaust holes (12), the exhaust holes (12) are arranged in multiple rows along the width direction of the shell (1) and multiple exhaust holes (12) are arranged in each row, the dustproof plate (8) is arranged obliquely, the length of the dustproof plate (8) is greater than the aperture of the exhaust hole (12), the dustproof plate (8) slides along the oblique direction thereof, the dustproof plate (8) corresponds to the exhaust hole (12) one by one, and an exhaust space (82) is formed between the dustproof plate (8) and the exhaust hole (12).

8. The leak detector of claim 7, wherein: The dustproof plates (8) in one row are synchronously moved through the connecting rods (81).

9. The leak detector of claim 8, wherein: Slip plates (9) are arranged between the adjacent two dustproof plates (8), the slip plates (9) are fixedly connected with the connecting rods (81), the inclination angle of the slip plates (9) is consistent with the inclination angle of the dustproof plates (8), a slip groove (16) for the slip plate (9) to slide is formed in the wall of the shell of the slip plate (9), the slip groove (16) penetrates through the bottom wall of the shell (1), the slip plate (9) slides in the slip groove (16), the bottom surface of one end of the slip plate (9) in the slip groove (16) is provided with an anti-disengagement block (91), the anti-disengagement block (91) is triangular, an anti-disengagement groove (17) for the anti-disengagement block (91) to slide is formed in the side wall of the slip groove (16), and the anti-disengagement groove (17) does not penetrate through the bottom wall of the shell (1).

10. The leak detector of claim 9, wherein: The top surface of one end of the slip plate (9) in the slip groove (16) is provided with a limiting block (92), the length of the limiting block (92) is greater than the width of the slip plate (9), a limiting groove (18) for the limiting block (92) to slide is formed in the side wall of the slip groove (16), and the limiting groove (18) does not penetrate through the bottom wall of the shell (1).

Images