Ammonia sensor testing device

Abstract

The present invention discloses an ammonia sensor testing device, comprising a testing tube body, one end of the testing tube body is fixedly connected with a one-way air outlet, the other end of the testing tube body is slidably mounted with a one-way air inlet, an air chamber is formed between the one-way air outlet and the one-way air inlet; when the one-way air inlet slides close to the one-way air outlet, the gas in the air chamber is squeezed out; the present invention provides an ammonia sensor testing device, comprising a one-way air outlet and a one-way air inlet, the space formed between the one-way air outlet and the one-way air inlet is also the air chamber, since the one-way air inlet is slidably mounted in the testing tube body, the volume of the air chamber is variable, when the one-way air inlet slides close to the one-way air outlet, the volume of the air chamber is reduced, and the original gas in the air chamber is discharged from the one-way air outlet, so that the original gas in the air chamber is discharged without inhaling ambient gas, thereby avoiding the influence of the original gas in the air chamber on the test result of the ammonia sensor.

Description

Technical Field

[0001] The invention relates to an ammonia gas detection technology, and in particular to an ammonia gas sensor testing device. Background Art

[0002] As is known, ammonia is a colorless gas with a strong pungent smell. It is weakly alkaline and can be liquefied by pressurization at room temperature. It is also easily solidified into a snow-like solid and soluble in water, ethanol and ether. Ammonia decomposes into nitrogen and hydrogen at high temperatures and has a reducing effect. Ammonia is widely used in industrial production, but this gas is corrosive and has a strong pungent smell, which can easily corrode the upper respiratory tract of the human body, thereby affecting people's life safety. Therefore, in the environment of industrial production, it is usually necessary to use an ammonia sensor to detect whether ammonia is leaking.

[0003] In order to test the ammonia sensor to ensure that it can work properly, it is necessary to make the ambient air contact with the ammonia sensor. Existing ammonia sensors generally include two ways of contacting with the ambient air: active and passive. The working principle of the active ammonia sensor is: the ambient gas is sucked into the air chamber by the air pump, so that the ammonia sensor in the air chamber contacts with the ambient air and detects it to test the ammonia sensor. This way of contacting with the ambient air is fast and efficient; the working principle of the passive ammonia sensor is: the ambient gas slowly contacts with the ammonia sensor by its own fluidity, and then the ammonia sensor detects whether there is ammonia in the gas.

[0004] For example, the patent with the authorization announcement number CN220672054U and the authorization announcement date March 26, 2024, is named "A patent for an ammonia sensor with sound and light alarm", including a sensor body and a control display mechanism, wherein the control display mechanism includes a control button, a display screen, a speaker and an alarm light, an air inlet is arranged on the side of the sensor body, a sealing sheet is connected to one end of the telescopic rod, and a detection head is arranged on the side of the support rod. This patent can be realized by setting up a speaker, an alarm light and a fixed frame. During use, the gas to be detected is retained inside the fixed frame, and the detection head detects and analyzes the concentration of the gas. The ammonia concentration value is displayed on the display screen of the device. When the ammonia exceeds the normal range, the speaker sounds an alarm and the alarm light flashes continuously, which can promptly notify the staff and take control measures on the ammonia pipeline to protect the health of people in the space area and avoid ammonia poisoning accidents.

[0005] Another example is a patent with the authorization announcement number CN218331344U and the authorization announcement date January 17, 2023, entitled "A portable ammonia concentration analysis device", which includes a shell, in which a nickel-hydrogen rechargeable battery, a micro-negative pressure pump, a microcontroller, an ammonia sensor, a benzene sensor, a TVOC sensor and a liquid crystal display are installed respectively, and the micro-negative pressure pump and the microcontroller are electrically connected to the nickel-hydrogen rechargeable battery respectively, and the micro-negative pressure pump is electrically connected to the microcontroller. The portable ammonia concentration analysis device has the characteristics of high precision, small size, light weight, user-defined settings of various parameters, simple operation, and easy to carry. It uses a large-capacity nickel-hydrogen rechargeable battery inside, has an ultra-long standby time, and a digital LCD backlight liquid crystal screen display, which is clear and intuitive, can be flexibly configured for single gas or multiple gas detection, has a built-in gas sampling pump, and the measurement results are more accurate and fast. It has an alarm function and can provide timely, accurate and intuitive alarm prompts for preset alarm concentrations.

[0006] In the prior art, when the active ammonia sensor takes in air, its air inlet and outlet are both open, and the ambient gas is sucked in through an air pump to discharge the gas originally in the air chamber. However, this method of discharging gas has the following problems: firstly, it is difficult to completely discharge the gas originally in the air chamber; secondly, the sucked ambient gas will mix with the gas originally in the air chamber, affecting the test results of the ammonia sensor. Summary of the invention

[0007] The purpose of the present invention is to provide an ammonia sensor testing device to solve the above-mentioned deficiencies in the prior art.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] An ammonia sensor testing device comprises a testing tube body, wherein a one-way air outlet is fixedly connected to one end of the testing tube body, a one-way air inlet is slidably mounted on the other end of the testing tube body, and an air chamber is formed between the one-way air outlet and the one-way air inlet;

[0010] When the one-way air inlet slides close to the one-way air outlet, the gas in the air chamber is squeezed out.

[0011] The above-mentioned ammonia sensor testing device also includes a top mounting piece, a connecting part is rotatably mounted on the lower end of the top mounting piece, the test tube body is detachably fixed to the lower end of the connecting part, and an airflow detection unit is arranged on the connecting part, and the airflow detection unit is used to detect the flow direction of the airflow and drive the connecting part to rotate.

[0012] In the above-mentioned ammonia sensor testing device, the ammonia sensor is installed in the gas chamber.

[0013] In the above-mentioned ammonia sensor testing device, the test tube body includes an air inlet and an air outlet, the initial position of the one-way air inlet portion is close to the air inlet, and the one-way air outlet portion is close to the air outlet.

[0014] In the above-mentioned ammonia sensor testing device, the one-way air intake portion comprises a first circular plate slidably mounted in the testing tube body, and a plurality of one-way air intake valves are mounted on the first circular plate.

[0015] In the above-mentioned ammonia sensor testing device, the one-way gas outlet portion includes a second circular plate fixed in the testing tube body, and a plurality of one-way gas outlet valves are installed on the second circular plate.

[0016] In the above-mentioned ammonia sensor testing device, a driving assembly is also installed in the test tube body, and the driving assembly includes a connecting shaft slidably penetrated on the one-way air outlet portion, and the connecting shaft is located at one end of the air chamber and fixedly connected to the one-way air inlet portion. An electric push rod is also installed in the test tube body, and the connecting shaft is located at one end outside the air chamber and fixedly connected to the movable end of the electric push rod.

[0017] The above-mentioned ammonia sensor testing device, the one-way air inlet part includes a fixed circular plate fixed on a connecting shaft, a rotating circular plate is also rotatably sleeved on the connecting shaft, the rotating circular plate is attached to one end of the fixed circular plate close to the one-way air outlet part, a plurality of first connecting ports are opened on the fixed circular plate, a plurality of second connecting ports corresponding to the first connecting ports are opened on the rotating circular plate, in an initial state, the corresponding first connecting ports and second connecting ports are staggered with each other, and a switching component is also included, the switching component is mainly used to drive the first connecting port and the second connecting port to dock.

[0018] In the above-mentioned ammonia sensor testing device, the switching component includes a first extrusion block installed on one end face of the one-way air outlet portion located in the air chamber, and a first inclined portion is provided on the rotating circular plate. The first extrusion block and the first inclined portion are correspondingly arranged. When the first extrusion block presses the first inclined portion to move, the rotating circular plate will rotate accordingly and cause the first connecting port and the second connecting port to gradually overlap.

[0019] In the above-mentioned ammonia sensor testing device, an arc-shaped groove is formed on the fixed circular plate, and a second inclined portion is formed on the rotating circular plate. The second inclined portion is slidably arranged in the arc-shaped groove and extends outside the arc-shaped groove. A support frame is fixedly connected to the inner wall of the test tube body, and a second extrusion block is fixed on the support frame. The second extrusion block and the second inclined portion are correspondingly arranged.

[0020] In the above technical scheme, the present invention provides an ammonia sensor testing device, including a one-way air outlet and a one-way air inlet. The space formed between the one-way air outlet and the one-way air inlet is an air chamber. Since the one-way air inlet is slidably installed in the test tube body, the volume of the air chamber is variable. When the one-way air inlet slides close to the one-way air outlet, the volume of the air chamber decreases, and the original gas in the air chamber is discharged from the one-way air outlet. In this way, the original gas in the air chamber is discharged without inhaling ambient gas, thereby avoiding the influence of the original gas in the air chamber on the test result of the ammonia sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the three-dimensional structure of an ammonia sensor testing device provided in one embodiment of the present invention.

[0023] Figure 2 A schematic diagram of the internal structure of an ammonia sensor testing device provided in one embodiment of the present invention.

[0024] Figure 3 A schematic diagram of a partial three-dimensional structure of an ammonia sensor testing device from a first perspective provided by an embodiment of the present invention.

[0025] Figure 4 For the present invention Figure 3 A local enlarged view of point X.

[0026] Figure 5 A partial three-dimensional structural schematic diagram of an ammonia sensor testing device from a second perspective provided by an embodiment of the present invention.

[0027] Figure 6 A partial three-dimensional structural schematic diagram of an ammonia sensor testing device provided in yet another embodiment of the present invention.

[0028] Figure 7 For the present invention Figure 6 A partial enlarged view of point Y.

[0029] Figure 8 A schematic diagram of a partial three-dimensional structure of an ammonia sensor testing device from a first perspective provided in yet another embodiment of the present invention.

[0030] Fig. 9 For the present invention Figure 8 A partial enlarged view of point Z.

[0031] Fig.10 A cross-sectional view of a connecting shaft, a one-way air outlet, and a one-way air inlet provided in yet another embodiment of the present invention.

[0032] Fig.11 For the present invention Fig.10 A local enlarged view of point T.

[0033] Fig.12 A partial three-dimensional structural schematic diagram of an ammonia sensor testing device from a second perspective provided in yet another embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1. Test tube body; 11. Top mounting member; 12. Connecting part; 13. Air inlet; 14. Air outlet; 15. Driving assembly; 151. Connecting shaft; 152. First shaft; 153. Second shaft; 154. L-shaped block; 155. Slant elastic block; 156. Torsion spring; 157. Passive block; 158. Spring rod; 159. Elastic buffer; 2. One-way air outlet; 21. Second circular plate; 22. One-way air outlet valve; 3. One-way air outlet; 4. One-way air outlet valve; 5. One-way air outlet valve; 6. One-way air outlet valve; 7. One-way air outlet valve; 8. One-way air outlet valve; 9. One-way air outlet valve; 10. One-way air outlet valve; 11. One-way air outlet valve; 12. One-way air outlet valve; 13. One-way air outlet valve; 14. One-way air outlet valve; 15. One-way air outlet valve; 16. One-way air outlet valve; 17. One-way air outlet valve; 18. One-way air outlet valve; 19. One-way air outlet valve; 20. One-way air outlet valve; 10. One-way air outlet valve; 11. One-way air outlet valve; 12. One-way air outlet valve; 13. One-way air outlet valve; 14. One-way air outlet valve; 15. One-way air outlet valve; 16. One-way air outlet valve; 17. One-way air outlet valve; 18. One-way air outlet valve; 19. One-way air outlet valve; 10. One-way air outlet valve; 10. One-way air outlet valve; 11. One-way air outlet valve; 12. One-way air outlet valve; 13. One-way air outlet valve; To the air inlet part; 31, the first circular plate; 32, the one-way air inlet valve; 33, the fixed circular plate; 34, the rotating circular plate; 35, the first connecting port; 351, the filter screen; 36, the second connecting port; 37, the switching component; 371, the first extrusion block; 372, the first inclined portion; 373, the arc groove; 374, the second inclined portion; 375, the second extrusion block; 38, the positioning unit; 381, the positioning groove; 382, ​​the elastic positioning portion; 4, the air chamber. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] like Figure 1-12 As shown, an ammonia sensor testing device provided by an embodiment of the present invention includes a testing tube body 1, one end of the testing tube body 1 is fixedly connected with a one-way air outlet 2, the other end of the testing tube body 1 is slidably mounted with a one-way air inlet 3, and an air chamber 4 is formed between the one-way air outlet 2 and the one-way air inlet 3; when the one-way air inlet 3 slides close to the one-way air outlet 2, the gas in the air chamber 4 is squeezed out.

[0038] Specifically in the present embodiment, the test tube body 1 can be a polygonal tube such as a square tube, or a circular tube, preferably a circular tube, with both ends of the test tube body 1 passing through. The test tube body 1 is arranged in the test environment and located above the test environment so that ammonia can smoothly enter the test tube body 1; the one-way air outlet 2 is used to unidirectionally discharge the gas from the air chamber 4, and the one-way air inlet 3 is used to unidirectionally inhale the gas in the test environment. The one-way air outlet 2 is completely fixed on the inner wall of the test tube body 1 to form a seal. Preferably, the one-way air inlet 3 and the inner wall of the test tube body 1 are connected. A sliding seal is also provided between the two ends of the gas chamber 4, so as to ensure the sealing of the gas chamber 4 when the one-way air inlet 3 is not moving, and to prevent the gas in the gas chamber 4 from being discharged from the one-way air inlet 3 when the one-way air inlet 3 slides. The shapes of the one-way air inlet 3 and the one-way air outlet 2 are adapted to the inner wall shape of the test tube body 1; obviously, those skilled in the art have reason to combine the plate-like structure and the gas valve to form the one-way air outlet 2 and the one-way air inlet 3; the gas chamber 4 is located in the middle part of the test tube body 1, that is, the part is provided with the ammonia gas sensing mechanism, and the test process of the ammonia gas sensing mechanism also occurs in the gas chamber 4. , the air chamber 4 is located between the one-way air outlet 2 and the one-way air inlet 3, and because the one-way air inlet 3 can slide, the volume of the air chamber 4 can be changed, and the volume of the air chamber 4 can be gradually increased from zero, or gradually reduced to zero. The gas sucked into the air chamber 4 will stay in the air chamber 4 for a period of time for testing; specifically, during operation, when it is necessary to test the ammonia sensor, the one-way air inlet 3 is driven to slide in the test tube body 1 in the direction close to the one-way air outlet 2 (defined as the positive direction), thereby reducing the volume of the air chamber 4, and the gas in the air chamber 4 is then output from the one-way air outlet 2. When the one-way air inlet 3 is After the air inlet 3 is attached to the one-way air outlet 2, the original gas in the air chamber 4 is exhausted, and then the one-way air inlet 3 is driven to slide in the test tube body 1 in the direction away from the one-way air outlet 2 (defined as the reverse direction), and the volume of the air chamber 4 also increases to generate negative pressure, and the gas in the environment enters the air chamber 4 from the one-way air inlet 3. In this way, the original gas in the air chamber 4 is prevented from mixing with the gas in the environment, thereby ensuring the test result of the ammonia sensor. In addition, in this process, the exhaust and intake of the air chamber 4 are passively performed based on the movement of the one-way air inlet 3, thereby avoiding the use of an air pump and saving resources.

[0039] In another embodiment provided by the present invention, it also includes a top mounting member 11, and the top mounting member 11 is preferably a truncated cone structure. The top mounting member 11 is detachably fixed in the test environment and is located above the test environment. This is because ammonia is lighter than air, and therefore, ammonia appearing in the test environment will move upward. A connecting portion 12 is rotatably mounted on the lower end of the top mounting member 11, and the test tube body 1 is detachably fixed to the lower end of the connecting portion 12. An airflow detection unit (not shown in the figure) is provided on the connecting portion 12, and the airflow detection unit is used to detect the flow direction of the airflow and drive the connecting portion 12 to rotate; when the airflow detection unit detects a continuous airflow direction, the connecting portion 12 is driven to drive the test tube body 1 to rotate with the axis of the truncated cone top mounting member 11 as the rotation center, and when the one-way air inlet portion 3 of the test tube body 1 is relative to the airflow direction, the movement of the test tube body 1 is stopped, so that as much gas in the test environment as possible can enter the air chamber 4.

[0040] In another embodiment provided by the present invention, the ammonia sensor is installed in the air chamber 4 to detect whether ammonia exists in the air chamber 4 and the content of ammonia. The ammonia sensor is a prior art. The above embodiment mainly improves the use environment of the ammonia sensor to ensure the accuracy of the test results of the ammonia sensor. Therefore, the working principle of the ammonia sensor will not be described in detail here.

[0041] In another embodiment provided by the present invention, the test tube body 1 includes an air inlet 13 and an air outlet 14, the initial position of the one-way air inlet 3 is close to the air inlet 13, and the one-way air outlet 2 is close to the air outlet 14, the air inlet 13 and the air outlet 14 respectively correspond to the one-way air inlet 3 and the one-way air outlet 2, when the airflow detection unit detects a continuous airflow direction, the connecting part 12 is driven to drive the test tube body 1 to rotate synchronously, so that the air inlet 13 is relative to the airflow direction to allow sufficient ambient gas to enter.

[0042] In another embodiment provided by the present invention, the one-way air inlet portion 3 includes a first circular plate 31 slidably mounted in the test tube body 1, and a plurality of one-way air inlet valves 32 are mounted on the first circular plate 31. The one-way air inlet valves 32 are used to allow ambient gas to enter the air chamber 4 in one direction. An annular sealing ring is arranged on the outer side of the first circular plate 31, and the annular sealing ring is tightly attached to the inner wall of the test tube body 1 to form a seal. The one-way air inlet valve 32 is a type of gas valve, which is a prior art and will not be described in detail herein.

[0043] In another embodiment provided by the present invention, the one-way gas outlet portion 2 includes a second circular plate 21 fixed in the test tube body 1, and a plurality of one-way gas outlet valves 22 are installed on the second circular plate 21. The one-way gas outlet valves 22 are used to allow the ambient gas to be output from the gas chamber 4 in one direction. The one-way gas outlet valves 22 are a type of gas valve, which is a prior art and will not be described in detail herein.

[0044] In another embodiment provided by the present invention, a driving assembly 15 is further installed in the test tube body 1, and the driving assembly 15 includes a connecting shaft 151 slidably penetrated on the one-way air outlet portion 2, and one end of the connecting shaft 151 located in the air chamber 4 is fixedly connected to the one-way air inlet portion 3, and an electric push rod (not shown in the figure) is also installed in the test tube body 1, and one end of the connecting shaft 151 located outside the air chamber 4 is fixedly connected to the movable end of the electric push rod; when it is necessary to test the ammonia sensor, the one-way air inlet portion 3 is driven to slide forward by the electric push rod. At this time, the volume of the air chamber 4 is reduced, and the original gas in the air chamber 4 is output from the one-way air outlet portion 2. After the original gas in the air chamber 4 is exhausted, the one-way air inlet portion 3 is pushed to slide in the reverse direction by the electric push rod. At this time, the volume of the air chamber 4 is increased, and the ambient gas enters the air chamber 4 from the air inlet 13 through the one-way air inlet portion 3.

[0045] Obviously, it is most preferred to select a passive one-way structure to achieve one-way air intake, such as a structure in which a valve plate cooperates with a spring. The one-way air intake valve 32 is used in the above embodiment, but the one-way air intake valve 32 needs to overcome spring force and friction force during opening and closing, which will affect the circulation speed of the ambient gas, resulting in a pressure difference between the inside and outside of the air chamber 4. The gas concentration in the air chamber 4 will be lower than the ambient gas concentration, making the test result smaller and causing detection errors. Those skilled in the art have reason to adopt an active air intake method, such as adding a power mechanism to the one-way air intake part 3 and using a power source to drive the valve to open. However, the one-way air intake valve 32 still needs to move. If a power mechanism is added, the one-way air intake valve 32 will not move. The power mechanism will make the arrangement of the wires more complicated, which is not conducive to the movement of the one-way air intake valve 32; for this reason, another embodiment of the one-way air intake portion 3 is provided: the one-way air intake portion 3 includes a fixed circular plate 33 fixed on the connecting shaft 151, and the diameter of the fixed circular plate 33 is equal to the inner diameter of the test tube body 1, so that the air chamber 4 is sealed, and a rotating circular plate 34 is also rotatably sleeved on the connecting shaft 151, and the rotating circular plate 34 is attached to one end of the fixed circular plate 33 close to the one-way air outlet portion 2, and a plurality of first connecting ports 35 are opened on the fixed circular plate 33, and a plurality of second connecting ports 35 corresponding to the first connecting ports 35 are opened on the rotating circular plate 34. The first connecting port 35 and the second connecting port 36 are connected to each other, and the switching component 37 is mainly used to drive the first connecting port 35 and the second connecting port 36 to dock (the first connecting port 35 and the second connecting port 36 are defined as a connecting port when they are fully docked). In the initial state, the corresponding first connecting port 35 and the second connecting port 36 are staggered with each other; the first connecting port 35 and the second connecting port 36 have two working modes, namely the staggered mode and the connected mode. The staggered mode is also the initial state between the fixed circular plate 33 and the rotating circular plate 34. The staggered mode corresponds to the volume reduction of the air chamber 4 and exhaust, and the connected mode corresponds to the volume increase of the air chamber 4 and the inhalation of ambient gas. Specifically, in the staggered mode , the electric push rod drives the fixed circular plate 33 to slide forward, and since the rotating circular plate 34 is rotatably sleeved on the connecting shaft 151 and only rotation can occur between the two, the rotating circular plate 34 synchronously slides forward following the connecting shaft 151. At this time, since the first connecting port 35 and the second connecting port 36 are staggered with each other, a complete sealing structure is formed between the fixed circular plate 33 and the rotating circular plate 34. When the fixed circular plate 33 slides forward, the gas in the air chamber 4 can be squeezed to be output from the one-way air outlet 2; when the gas in the air chamber 4 is about to be exhausted, the switching component 37 drives the rotating circular plate 34 to rotate, so that the first connecting port 35 and the second connecting port 36 are gradually connected;When the first communication port 35 is completely connected with the second communication port 36, the electric push rod drives the fixed circular plate 33 and the rotating circular plate 34 to slide in the opposite direction. At this time, the external environment is connected to the air chamber 4 through the communication port. At this time, the fixed circular plate 33 moves in the opposite direction to allow the ambient gas to quickly enter from the communication port, avoiding the use of the one-way air intake valve 32, speeding up the circulation speed of the ambient gas, and ensuring the air intake efficiency; at the same time, active one-way air intake is realized without the need to arrange other power mechanisms or wiring. ;

[0046] In another embodiment provided by the present invention, the switching assembly 37 includes a first extrusion block 371 installed on an end surface of the one-way air outlet portion 2 located in the air chamber 4, and a first inclined surface portion 372 is provided on the rotating circular plate 34, and the first inclined surface portion 372 includes an arc block and an inclined surface segment, and the axis of the arc block coincides with the axis of the connecting shaft 151. When the first inclined surface portion 372 is extruded and moved, the rotating circular plate 34 moves synchronously, and the first extrusion block 371 and the first inclined surface portion 372 are correspondingly arranged. Further, in the initial state, the first extrusion block 371 and the inclined surface segment are correspondingly arranged; when the rotating circular plate 34 slides forward, the first extrusion block 371 will first contact the inclined surface segment to form a wedge-shaped extrusion fit, and when the first extrusion block 371 presses the first inclined surface portion 372 to move, the rotating circular plate 34 will rotate accordingly and make the first connecting port 35 and the second connecting port 36 gradually overlap, so that the staggered mode is switched to the connecting mode.

[0047] The technical solution mentioned in the above-mentioned switching assembly 37 is used to switch the staggered mode to the connected mode. In order to enable the connected mode to be switched back to the staggered mode and used multiple times, further design is required, but the working principles of the two are basically the same. In brief, the fixed circular plate 33 is provided with an arc groove 373, and the central axis of the arc groove 373 coincides with the axis of the connecting shaft 151. The rotating circular plate 34 is formed with a second inclined portion 374, and the second inclined portion 374 is also arc-shaped as a whole. The second inclined portion 374 is slidably penetrated in the arc groove 373 and extends to the outside of the arc groove 373. The inner wall of the test tube body 1 is fixedly connected with a support A support frame is provided with a second extrusion block 375 fixed on the support frame, and the second extrusion block 375 and the second inclined portion 374 are arranged in correspondence with each other; in the communication mode, the rotating circular plate 34 rotates a certain degree, at this time, the second inclined portion 374 will slide a certain distance in the arc groove 373, and the position of the second extrusion block 375 is designed for the second inclined portion 374 at this time, so that when the second inclined portion 374 and the second extrusion block 375 in the communication mode gradually contact each other, they will be smoothly squeezed and reset, so that the rotating circular plate 34 is reset and drives the first communication port 35 and the second communication port 36 to be staggered, thereby switching the communication mode back to the staggered mode.

[0048] In addition, the above embodiment also includes a positioning unit 38, and the positioning unit 38 is used to determine the relative position between the fixed circular plate 33 and the rotating circular plate 34, so that the staggered mode and the connected mode can exist separately for a period of time. This is to limit the rotating circular plate 34 to a certain extent to prevent it from rotating at will during work. Of course, there are many ways in the prior art to fix the relative position between the fixed circular plate 33 and the rotating circular plate 34. This embodiment provides a relatively simple solution. Two positioning grooves 381 are provided on one end surface of the fixed circular plate 33 close to the rotating circular plate 34. The two positioning grooves 381 are on the same virtual circle, and the central axis of the virtual circle coincides with the central axis of the rotating circular plate 34. The angle occupied by the two positioning grooves 381 is equal to the adjacent first connecting opening 35. and the angle occupied by the second connecting port 36 in the staggered mode, an elastic positioning portion 382 is also formed on the rotating circular plate 34, and in the initial state (that is, the staggered mode), the elastic positioning portion 382 is elastically snapped into one of the positioning grooves 381, and when the elastic positioning portion 382 is elastically snapped into the other positioning groove 381, the first connecting port 35 and the second connecting port 36 are in a connecting mode, so that only by compressing the first inclined portion 372 by the first extrusion block 371 can the elastic positioning portion 382 enter from one positioning groove 381 into another positioning groove 381, switching the two working modes, and when the elastic positioning portion 382 is elastically snapped into the positioning groove 381, the current state of the rotating circular plate 34 is determined, so that it can be ensured that the rotating circular plate 34 does not rotate when the volume of the air chamber 4 changes.

[0049] Furthermore, for some scenarios (such as for a high-concentration ammonia environment, quickly and massively inhaling ambient gas and performing detection can reach the detection limit of the detection instrument more quickly, thereby ensuring the effectiveness of the detection), the ammonia sensor needs to respond quickly when detecting ammonia, quickly and massively detect ambient gas samples, and detect changes in ammonia concentration in real time. In this way, the faster the air intake speed, the more accurate the real-time detection of ammonia concentration. Therefore, this embodiment is further improved; the connecting shaft 151 is a disconnected design, and the connecting shaft 151 includes a first shaft 152 and a second shaft 153. Unlike the fixed connection in the aforementioned embodiment, the first shaft 152 is rotatably connected to the fixed circular plate 33 and a torsion spring 156 is connected between the two. The torsion spring 156 is used to maintain the relative position between the first shaft 152 and the fixed circular plate 33. The second shaft 153 is connected to the electric push rod, and the first shaft 152 is away from the fixed An L-shaped block 154 is formed on one end of the circular plate 33, and the horizontal end of the L-shaped block 154 is connected to the first shaft 152. An inclined elastic block 155 is formed on the end of the second shaft 153 close to the fixed circular plate 33. The first shaft 152 and the second shaft 153 are connected together through the L-shaped block 154 and the inclined elastic block 155. The inclined elastic block 155 is also L-shaped, but an inclined surface is provided on the end close to the fixed circular plate 33. The function of the inclined surface is to facilitate the inclined elastic block 155 to squeeze the L-shaped block 154 so that the two can be squeezed first and then clamped together. The inclined elastic block 155 is made of elastic material and has a certain strength, and can be rubber. A passive block 157 is fixed to the upper end of the first shaft 152, and the passive block 157 is attached to the first inclined portion 372. When the first inclined portion 372 is squeezed and moved, the passive block 157 will also rotate accordingly.

[0050] In addition, the diameter of the rotating circular plate 34 is smaller than the diameter of the fixed circular plate 33. A spring rod 158 is fixed in the test tube body 1. The spring rod 158 is parallel to the axial direction of the test tube body 1. The movable end of the spring rod 158 is connected to the fixed circular plate 33 and will not pass through the rotating circular plate 34. The spring rod 158 is used to limit the movement direction of the fixed circular plate 33 and can also store energy. That is, the straight-line distance from the spring rod 158 to the connecting shaft 151 is greater than the diameter of the rotating circular plate 34. The spring rod 158 will not block the rotation of the rotating circular plate 34. The test tube body 1 is also fixed with an elastic buffer 159 (elastic buffer The punch 159 is preferably an elastic telescopic rod), and the elastic buffer 159 is used to buffer the impact force when the fixed circular plate 33 collides, and at the same time it can also limit the initial position of the fixed circular plate 33 to prevent the fixed circular plate 33 from sliding out of the test tube body 1 after the connecting shaft 151 is disconnected. The movable end of the elastic buffer 159 is in contact with the fixed circular plate 33; it should be particularly noted that in the initial state, that is, when the spring rod 158 is in the natural state, the rotating circular plate 34 is close to the air inlet 13, and at this time the inclined elastic block 155 is not connected with the L-shaped block 154, that is, at this time the first axis 152 and the second axis 153 are disconnected.

[0051] Specifically, in a complete test work, there are three working strokes. In the first stroke, the electric push rod pushes the second shaft 153 to move in the opposite direction and approach the first shaft 152. When the inclined elastic block 155 contacts the L-shaped block 154, the second shaft 153 continues to move. At this time, the fixed circular plate 33 is limited by the elastic buffer 159 and cannot continue to move, so that the inclined elastic block 155 can smoothly squeeze the L-shaped block 154 and clamp together. In the second stroke, the electric push rod drives the second shaft 153 to move in the opposite direction and approach the first shaft 152. When the inclined elastic block 155 contacts the L-shaped block 154, the second shaft 153 continues to move. At this time, the fixed circular plate 33 is limited by the elastic buffer 159 and cannot continue to move. Therefore, the inclined elastic block 155 can smoothly squeeze the L-shaped block 154 and clamp together. 3, at this time, since the inclined elastic block 155 is clamped together with the extruding L-shaped block 154, the first shaft 152 and the fixed circular plate 33 also move accordingly. At this time, the volume of the air chamber 4 is reduced, and the movement of the fixed circular plate 33 also synchronously squeezes the spring rod 158 to store energy, and the second shaft 153 continues to move, so that the inclined surface section on the first inclined surface portion 372 contacts the first extruding block 371, and the first extruding block 371 squeezes the first inclined surface portion 372 to move. This process is to switch the staggered mode to the connected mode. At this time, because the passive block 157 is attached to the first inclined surface 372, when the first inclined surface 372 moves, the passive block 157 moves synchronously and drives the first shaft 152 to rotate, and the first shaft 152 rotates to drive the L-shaped block 154 to rotate and gradually separate from the inclined elastic block 155 in the circumferential direction; in the third stroke, at this time, the L-shaped block 154 is completely separated from the inclined elastic block 155, and the staggered mode is also switched to the connected mode. Under the elastic action of the spring rod 158, the fixed circular plate 33 is quickly Slide forward and reset, and buffer the fixed circular plate 33 through the elastic buffer 159. During the rapid sliding reset of the fixed circular plate 33, the ambient gas quickly enters the air chamber 4 through the connecting port. In this way, a large amount of ambient gas is quickly inhaled and detected. In the above embodiment, the movement of the first inclined portion 372 can not only switch the offset mode to the connecting mode, but also push the release of the clamping relationship between the inclined elastic block 155 and the L-shaped block 154, so that the fixed circular plate 33 can be quickly reset and inhale gas.

[0052] Furthermore, it is obvious that there are dust and impurities in a general working environment, and a large amount of rapid air intake will cause an increase in impurities in the air chamber 4. For this reason, in this example, a filter screen 351 is installed on the first connecting port 35 and the filter screen 351 is arranged inclined, and the upper end of the filter screen 351 is inclined toward the direction close to the air chamber 4. In this way, impurities on the filter screen 351 can roll off naturally. When a large amount of ambient gas enters the air chamber 4, it can be filtered through the filter screen 351; moreover, when the fixed circular plate 33 slides back quickly and contacts the elastic buffer 159, the speed of the fixed circular plate 33 drops sharply. At this time, the impurities on the filter screen 351 are thrown out and move away from the air chamber 4 under the action of huge inertia. In this way, passive cleaning of impurities is naturally achieved, and the removed impurities will fall in the direction away from the air chamber 4, avoiding impurities from entering the air chamber 4 when cleaning the impurities.

[0053] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An ammonia sensor testing device, comprising a test tube body, characterized in that: A one-way air outlet is fixedly connected to one end of the test tube body, and a one-way air inlet is slidably mounted on the other end of the test tube body, and an air chamber is formed between the one-way air outlet and the one-way air inlet; When the one-way air inlet slides close to the one-way air outlet, the gas in the air chamber is squeezed out; A driving assembly is also installed in the test tube body, and the driving assembly includes a connecting shaft slidably inserted into the one-way air outlet portion, and one end of the connecting shaft located in the air chamber is fixedly connected to the one-way air inlet portion. An electric push rod is also installed in the test tube body, and one end of the connecting shaft located outside the air chamber is fixedly connected to the movable end of the electric push rod. The one-way air inlet portion includes a fixed circular plate fixed on a connecting shaft, a rotating circular plate is also rotatably sleeved on the connecting shaft, the rotating circular plate is attached to one end of the fixed circular plate close to the one-way air outlet portion, a plurality of first connecting ports are opened on the fixed circular plate, a plurality of second connecting ports corresponding to the first connecting ports are opened on the rotating circular plate, in an initial state, the corresponding first connecting ports and second connecting ports are staggered with each other, and a switching component is also included, the switching component is mainly used to drive the first connecting port and the second connecting port to dock.

2. An ammonia sensor testing device according to claim 1, characterized in that: It also includes a top mounting piece, a connecting part is rotatably mounted on the lower end of the top mounting piece, the test tube body is detachably fixed to the lower end of the connecting part, an airflow detection unit is arranged on the connecting part, and the airflow detection unit is used to detect the flow direction of the airflow and drive the connecting part to rotate.

3. An ammonia sensor testing device according to claim 1, characterized in that: The ammonia sensor is installed in the gas chamber.

4. An ammonia sensor testing device according to claim 2, characterized in that: The test tube body comprises an air inlet and an air outlet, the initial position of the one-way air inlet portion is close to the air inlet, and the one-way air outlet portion is close to the air outlet.

5. The ammonia sensor testing device according to claim 1, characterized in that: The one-way air inlet portion comprises a first circular plate slidably mounted in the test tube body, and a plurality of one-way air inlet valves are mounted on the first circular plate.

6. The ammonia sensor testing device according to claim 1, characterized in that: The one-way air outlet portion comprises a second circular plate fixed in the test tube body, and a plurality of one-way air outlet valves are installed on the second circular plate.

7. The ammonia sensor testing device according to claim 1, characterized in that: The switching assembly includes a first extrusion block installed on an end surface of the one-way air outlet portion located in the air chamber, and a first inclined portion is provided on the rotating circular plate. The first extrusion block and the first inclined portion are correspondingly arranged. When the first extrusion block presses the first inclined portion to move, the rotating circular plate will rotate accordingly and cause the first connecting port and the second connecting port to gradually overlap.

8. An ammonia sensor testing device according to claim 7, characterized in that: An arc groove is formed on the fixed circular plate, and a second inclined portion is formed on the rotating circular plate. The second inclined portion is slidably arranged in the arc groove and extends outside the arc groove. A support frame is fixedly connected to the inner wall of the test tube body, and a second extrusion block is fixed on the support frame. The second extrusion block and the second inclined portion are correspondingly arranged.

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