Gas dilution device for gas sensor detection

Abstract

The invention provides a gas dilution device for gas sensor detection, which comprises a dilution tank, and also comprises a piston, a communication port, a butt joint assembly and a push-pull assembly, the piston is slidably arranged at the top end in the dilution tank, the piston comprises a first piston body and a second piston body, and a first support spring is arranged between the second piston body and the bottom surface in the dilution tank; the communicating opening is formed in the top of the first plug body, the first plug body and the second plug body are in threaded butt joint through the butt joint assembly, the communicating opening is blocked, and the push-pull assembly is used for pushing and pulling the first plug body in the dilution tank. After high-concentration standard gas and diluent gas are mixed, the first plug body is repeatedly pushed and pulled, the gas flows in the communication port, turbulent shear force is formed, a layered interface is broken, and the layered gas flows in the communication port, so that uniform mixing is realized; and it is ensured that the low-concentration standard gas collected by the gas sensor is uniformly mixed standard gas.

Description

Technical Field

[0001] The invention belongs to the field of gas dilution, and in particular relates to a gas dilution device for gas sensor detection. Background Art

[0002] Diluting standard gas is a key technical link for detecting technical indicators such as the sensitivity, response time, selectivity, and detection limit of gas sensors. During the process of diluting standard gas, a certain amount of high-concentration standard gas and a certain amount of diluting gas are introduced, and then the introduced high-concentration standard gas and the diluting gas are mixed to complete the dilution. Then, after passing through a flow meter, it is connected to the main body of the gas sensor. However, after diluting high- and low-concentration standard gases, the diluted and mixed gas will be stored in the dilution tank. If the molecular weight difference between the diluting gas and the target gas is too large, the gravitational force during long-term static placement will cause the light components to float and the heavy components to sink, forming a concentration gradient stratification. When directly introduced into the main body of the gas sensor for detection, the stratification causes a concentration gradient to form in the pipeline, and the gas sensor captures non-uniform concentration samples during local sampling. Summary of the Invention

[0003] In view of this, the present invention aims to provide a gas dilution device for gas sensor detection to solve the technical problem that after diluting high- and low-concentration standard gases, the diluted and mixed gas will be stored in the dilution tank. If the molecular weight difference between the diluting gas and the target gas is too large, the gravitational force during long-term static placement will cause the light components to float and the heavy components to sink, forming a concentration gradient stratification. When directly introduced into the gas sensor for detection, the stratification causes a concentration gradient to form in the pipeline, and the gas sensor captures non-uniform concentration samples during local sampling.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] A gas dilution device for gas sensor detection includes a dilution tank. The top end of the dilution tank is connected with an air injection component and an exhaust pipe. An exhaust valve and a flow meter are sequentially installed on the exhaust pipe. The port of the exhaust pipe is connected to the main body of the gas sensor. It also includes a piston, a communication port, a docking component, and a pushing and pulling component. The piston is slidably arranged at the top end inside the dilution tank. The piston includes a first plug body and a second plug body. A first support spring is arranged between the second plug body and the bottom surface inside the dilution tank. The communication port is opened at the top of the first plug body. The docking component threadedly docks the first plug body and the second plug body and blocks the communication port. The pushing and pulling component is used to push and pull the first plug body inside the dilution tank. An opening is provided at the bottom end of the dilution tank.

[0006] Further, the gas injection assembly includes a communication chamber, which is fixedly connected to the top of the dilution tank. A first gas injection pipe and a second gas injection pipe are fixedly connected to the surface of the communication chamber. Gas injection valves are installed on the surfaces of the first gas injection pipe and the second gas injection pipe.

[0007] Further, the docking assembly includes a first motor and a connection groove. The first motor is fixedly installed at the bottom of the second plug body. The connection groove is opened at the top of the second plug body. A support seat is rotatably connected in the connection groove. The bottom of the support seat is fixedly connected to the output end of the first motor. The top of the support seat is fixedly connected to a connecting rod. A threaded body is fixedly connected to the surface of the connecting rod. A threaded groove is opened in the communication port. The threaded body is threadedly connected to the threaded groove. The top of the connecting rod is flush with the top of the first plug body;

[0008] An annular pressure relief groove is further opened at the top of the second plug body. An annular pressure relief cover is slidably connected in the annular pressure relief groove. A third support spring is fixedly connected between the annular pressure relief cover and the annular pressure relief groove. A pressure relief hole is opened on the inner bottom surface of the annular pressure relief groove.

[0009] Further, the pushing and pulling assembly includes two connecting rods. The tops of the two connecting rods sequentially penetrate through the bottom end of the dilution tank and the second plug body and are fixedly connected to the bottom of the first plug body. The bottoms of the two connecting rods are fixedly connected to a pushing and pulling plate.

[0010] Further, a support frame is further included. The support frame includes a base and a side plate. A connecting frame is fixedly connected to the surface of the side plate. The connecting frame is fixedly sleeved on the surface of the dilution tank.

[0011] Further, a slide rail is further fixedly connected to the side plate. A moving seat is slidably arranged on the surface of the slide rail. A connecting seat is fixedly connected to the front of the moving seat. A rotating seat is rotatably connected to the end of the connecting seat. A lapping groove is opened at the end of the rotating seat. A second motor is fixedly connected to the top of the connecting seat. The output end of the second motor is fixedly connected to the connecting seat coaxially. A threaded sleeve is fixedly connected to the side wall of the moving seat. A reciprocating lead screw is threadedly connected inside the threaded sleeve. A third motor is arranged at the bottom end of the reciprocating lead screw. The third motor is fixedly installed on the top of the base, and the output end is fixedly connected to the reciprocating lead screw.

[0012] Further, the pushing and pulling plate includes a connecting plate and a lapping plate. The connecting plate is fixedly connected to the bottoms of the two connecting rods. The lapping plate is fixedly connected to the surface of the connecting plate. The lapping plate is adapted to the lapping groove.

[0013] Further, an installation cavity is formed at the top of the support base. A end cover is fixedly connected to the top end of the installation cavity. The end cover is fixedly connected to the bottom of the connecting rod. A moving plate is slidably arranged inside the installation cavity. A second support spring is fixedly connected between the moving plate and the inner wall of the installation cavity. Three arc-shaped plates distributed in a circular array are fixedly connected to the top of the moving plate. Three arc-shaped grooves are formed at the top of the end cover. The three arc-shaped plates are inserted into the three arc-shaped grooves and the top is in contact with the bottom of the first plug body.

[0014] Further, a first ventilation hole is formed on the surface of the moving plate. A second ventilation hole is formed on the inner bottom surface of the connection groove. A third ventilation hole is formed on the inner bottom surface of the installation cavity. A gap is provided between the support base and the inner bottom surface of the connection groove.

[0015] Further, annular grooves are formed on the surfaces of the first plug body and the second plug body. Sealing rings are sleeved inside the annular grooves. The sealing rings are in contact with the inner wall of the dilution tank.

[0016] Compared with the prior art, the gas dilution device for gas sensor detection of the present invention has the following advantages:

[0017] (1) In the present invention, after mixing the high-concentration standard gas with the dilution gas, the threaded connection between the first plug body and the second plug body is cancelled through the docking assembly, and then the first plug body is pushed and pulled through the pushing and pulling assembly. During the process of pushing the first plug body upward, the gas above the piston will move through the communication port to between the first plug body and the second plug body. During the process of pulling the first plug body close to the second plug body, the gas between the first plug body and the second plug body will flow through the communication port to above the first plug body. By repeatedly pushing and pulling the first plug body, the gas flows in the communication port, forming a turbulent shear force, breaking the stratified interface, and the stratified gas flows in the communication port, which is beneficial to achieve uniform mixing and ensure that the low-concentration standard gas collected by the gas sensor is the uniformly mixed standard gas.

[0018] (2) In the present invention, by providing the threaded groove, during the process of the mixed gas passing through the communication port, the mixed gas will generate eddy currents under the guiding action of the threaded groove. The eddy currents trigger three-dimensional turbulence through rotational motion, breaking the gas stratified boundary layer, which is beneficial to gas mixing.

[0019] Through the connection of the whole of the connecting rod and the threaded body with the communication port, during the initial gas injection process, the stable connection between the first plug body and the second plug body is ensured, and the communication port is blocked to prevent gas from remaining in the communication port. Before gas injection, the gas at the top of the piston is discharged from the inside of the top of the dilution tank. After gas injection and mixing, before the sampled gas is detected by the gas sensor body, the threaded connection between the threaded body and the internal thread groove of the communication port is cancelled, the communication port is opened, and conditions are provided for the first plug body to push and pull above the second plug body.

[0020] During the process of the first plug body moving away from the second plug body, the second support spring will push the moving plate, and the moving plate will push the arc plate to extend out of the arc groove. During the process of the first motor continuing to drive the support seat to rotate, the arc plate will stir the gas above the support seat, thereby realizing the stirring of the gas between the first plug body and the second plug body, which is beneficial to the mixing of the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 FIG. 1 is a schematic diagram of the first overall structure of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

[0023] Figure 2 is Figure 1 an enlarged view of part A in FIG. 1;

[0024] Figure 3 FIG. 2 is a structural sectional view of a dilution tank of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

[0025] Figure 4 FIG. 3 is a structural sectional view of a first plug body of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

[0026] Figure 5 FIG. 4 is a structural sectional view of a second plug body of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

[0027] Figure 6 FIG. 5 is an exploded view of a support seat, an installation cavity, an end cover and a moving plate of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

[0028] Figure 7 FIG. 6 is a structural schematic diagram of a moving plate of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

[0029] Figure 8Schematic diagram of the lapping state between the push-pull plate and the lapping groove of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

[0030] Figure 9 First schematic diagram of the second plug body of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

[0031] Figure 10 Second schematic diagram of the second plug body of a gas dilution device for gas sensor detection according to an embodiment of the present invention.

[0032] Explanation of reference numerals:

[0033] 1 - Dilution tank; 101 - Opening; 2 - Exhaust pipe; 3 - Flowmeter; 4 - Exhaust valve; 5 - Communication port; 6 - First plug body; 7 - Second plug body; 8 - First support spring; 9 - Communication chamber; 10 - First gas injection pipe; 11 - Second gas injection pipe; 12 - Gas injection valve; 13 - First motor; 14 - Connection groove; 15 - Support base; 16 - Connecting rod; 17 - Threaded body; 18 - Threaded groove; 19 - Annular pressure relief groove; 20 - Annular pressure relief cover; 21 - Third support spring; 22 - Pressure relief hole; 23 - Connecting rod; 24 - Push-pull plate; 2401 - Connection plate; 2402 - Lapping plate; 25 - Support frame; 2501 - Base; 2502 - Side plate; 2503 - Connection frame; 26 - Moving seat; 27 - Connection seat; 28 - Rotating seat; 29 - Lapping groove; 30 - Second motor; 31 - Threaded sleeve; 32 - Reciprocating lead screw; 33 - Third motor; 34 - Installation cavity; 3401 - End cover; 35 - Moving plate; 36 - Second support spring; 37 - Arc plate; 38 - Arc groove; 39 - First ventilation hole; 40 - Second ventilation hole; 41 - Sealing ring; 42 - Through hole; 43 - Gas sensor body; 44 - Third ventilation hole. Detailed implementation manners

[0034] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0037] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0038] As Figures 1 to 10 shown, in one embodiment, a gas dilution device for gas sensor detection includes a dilution tank 1. An air injection assembly and an exhaust pipe 2 are connected to the top end of the dilution tank 1. An exhaust valve 4 and a flow meter 3 are sequentially installed on the exhaust pipe 2. The port of the exhaust pipe 2 is connected to a gas sensor main body 43. It further includes a piston, a communication port 5, a docking assembly, and a pushing and pulling assembly. The piston is slidably disposed at the top end inside the dilution tank 1. The piston includes a first plug body 6 and a second plug body 7. A first support spring 8 is disposed between the second plug body 7 and the bottom surface inside the dilution tank 1. The communication port 5 is opened at the top of the first plug body 6. The docking assembly threadedly docks the first plug body 6 and the second plug body 7 and blocks the communication port 5. The pushing and pulling assembly is used to push and pull the first plug body 6 to move inside the dilution tank 1. An opening 101 is opened at the bottom end of the dilution tank 1.

[0039] It should be understood that during the process of diluting the gas, first, a high-concentration standard gas is quantitatively injected into the dilution tank 1 through the air injection assembly, and then the diluting gas is quantitatively injected into the dilution tank 1 through the air injection assembly. The injected gas will push the piston downward, and the diluting gas and the high-concentration standard gas will be mixed.

[0040] After mixing a high-concentration standard gas with a dilution gas, the threaded connection between the first plug body 6 and the second plug body 7 is cancelled through the docking assembly, and then the first plug body 6 is pushed and pulled through the push-pull assembly. During the process of pushing the first plug body 6 upward, the gas above the piston will move through the communication port 5 to the space between the first plug body 6 and the second plug body 7. During the process of pulling the first plug body 6 close to the second plug body 7, the gas between the first plug body 6 and the second plug body 7 will flow through the communication port 5 and then to the upper part of the first plug body 6. By repeatedly pushing and pulling the first plug body 6, the gas flows in the communication port 5, forming a turbulent shear force, breaking the stratified interface. The stratified gas flows in the communication port 5, which is beneficial to achieving uniform mixing;

[0041] Then, the exhaust valve 4 is opened, and the piston will reset under the support of the first support spring 8, pushing the mixed gas upward. Under the connection of the exhaust pipe 2, the mixed gas passes through the exhaust valve 4 and then the gas flow is detected by the flow meter 3. The gas sensor body 43 will collect the standard gas sample with a reduced concentration, which is beneficial to ensuring that the collected low-concentration standard gas is the uniformly mixed standard gas.

[0042] As Figure 1 and Figure 3 shown, in one embodiment, the gas injection assembly includes a communication chamber 9, which is fixedly connected to the top end of the dilution tank 1. A first gas injection pipe 10 and a second gas injection pipe 11 are fixedly connected to the surface of the communication chamber 9. Gas injection valves 12 are installed on the surfaces of both the first gas injection pipe 10 and the second gas injection pipe 11. It should be understood that when gas needs to be injected, the first gas injection pipe 10 or the second gas injection pipe 11 can be selected for injection, and gas injection is carried out by opening the gas injection valve 12 to control the gas injection volume.

[0043] As Figures 3 to 5 shown, in one embodiment, the docking assembly includes a first motor 13 and a connection groove 14. The first motor 13 is fixedly installed at the bottom of the second plug body 7. The connection groove 14 is opened at the top end of the second plug body 7. A support seat 15 is rotatably connected in the connection groove 14. The bottom of the support seat 15 is fixedly connected to the output end of the first motor 13. The top of the support seat 15 is fixedly connected to a connecting rod 16. A threaded body 17 is fixedly connected to the surface of the connecting rod 16. A threaded groove 18 is opened in the communication port 5. The threaded body 17 is threadedly connected to the threaded groove 18. The top of the connecting rod 16 is flush with the top of the first plug body 6;

[0044] The top of the second plug body 7 is also provided with an annular pressure relief groove 19. An annular pressure relief cover 20 is slidably connected in the annular pressure relief groove 19. A third support spring 21 is fixedly connected between the annular pressure relief cover 20 and the annular pressure relief groove 19. A pressure relief hole 22 is provided on the inner bottom surface of the annular pressure relief groove 19. It should be understood that after injecting the high-concentration standard gas and the dilution gas into the dilution tank 1, the piston will move to the bottom end of the dilution tank 1, compress the first support spring 8, and then start the first motor 13. The first motor 13 will drive the connecting rod 16 to rotate. The connecting rod 16 will be thread-driven in the thread groove 18 through the threaded body 17, so that the first plug body 6 moves upward until the thread groove 18 of the first plug body 6 is disengaged from the threaded body 17. During the process that the thread groove 18 and the threaded body 17 are not disengaged and the first plug body 6 is far away from the second plug body 7, a negative pressure will be generated between the first plug body 6 and the second plug body 7. The external atmosphere will enter the annular pressure relief groove 19 through the pressure relief hole 22, push the annular pressure relief cover 20 out of the annular pressure relief groove 19, balance the air pressure between the first plug body 6 and the second plug body 7, and until the thread groove 18 of the first plug body 6 is disengaged from the threaded body 17, the gas above the first plug body 6 will enter between the first plug body 6 and the second plug body 7 through the communication port 5;

[0045] By providing the thread groove 18, during the process that the mixed gas passes through the communication port 5, the mixed gas will generate a vortex under the guiding action of the thread groove 18. The vortex will trigger three-dimensional turbulence through rotational motion, destroy the gas stratification boundary layer, and is beneficial to the mixing of the gas.

[0046] Through the connection of the whole of the connecting rod 16 and the threaded body 17 to the communication port 5, during the initial gas injection process, the stable connection between the first plug body 6 and the second plug body 7 is ensured, and the communication port 5 is blocked to avoid the existence of gas in the communication port 5, ensuring that before gas injection, the gas at the top end inside the dilution tank 1 is discharged by the piston top. After gas injection and mixing, before the sampled gas is detected by the gas sensor main body 43, the threaded connection between the threaded body 17 and the thread groove 18 in the communication port 5 is cancelled, the communication port 5 is opened, and conditions are provided for the first plug body 6 to push and pull and move above the second plug body 7.

[0047] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 8 As shown, in one embodiment, the push-pull assembly includes two connecting rods 23. The tops of the two connecting rods 23 sequentially penetrate the bottom end of the dilution tank 1 and the second plug body 7 and are fixedly connected to the bottom of the first plug body 6. The bottoms of the two connecting rods 23 are fixedly connected with a push-pull plate 24. It should be understood that after the docking between the first plug body 6 and the second plug body 7 is cancelled, the connecting rods 23 can be driven to move by moving the push-pull plate 24, and the connecting rods 23 drive the first plug body 6 to move, thereby realizing the push-pull movement of the first plug body 6.

[0048] As Figure 1 shown, in one embodiment, it further includes a support frame 25. The support frame 25 includes a base 2501 and side plates 2502. A connecting frame 2503 is fixedly connected to the surface of the side plates 2502. The connecting frame 2503 is fixedly sleeved on the surface of the dilution tank 1. It should be understood that the dilution tank 1 is supported by the support frame 25.

[0049] As Figure 1 、 Figure 2 and Figure 8 shown, in one embodiment, a slide rail is further fixedly connected to the side plates 2502. A moving seat 26 is slidably arranged on the surface of the slide rail. A connecting seat 27 is fixedly connected to the front surface of the moving seat 26. A rotating seat 28 is rotatably connected to the end of the connecting seat 27. A lapping groove 29 is formed at the end of the rotating seat 28. A second motor 30 is fixedly connected to the top of the connecting seat 27. The output end of the second motor 30 is fixedly connected to the connecting seat 27 coaxially. A threaded sleeve 31 is fixedly connected to the side wall of the moving seat 26. A reciprocating lead screw 32 is threadedly connected inside the threaded sleeve 31. A third motor 33 is arranged at the bottom end of the reciprocating lead screw 32. The third motor 33 is fixedly installed on the top of the base 2501, and the output end is fixedly connected to the reciprocating lead screw 32. It should be understood that when it is necessary to push and adjust the push-pull plate 24, the second motor 30 can be started. The second motor 30 drives the rotating seat 28 to rotate. The lapping groove 29 of the rotating seat 28 will lap on the end of the push-pull plate 24 to form a butt joint. Then the third motor 33 is started. The third motor 33 drives the reciprocating lead screw 32 to rotate. The reciprocating lead screw 32 drives the threaded sleeve 31 to reciprocate, thereby driving the moving seat 26, the rotating seat 28, the push-pull plate 24 and the connecting rod 23 to move synchronously, realizing the reciprocating movement of the connecting rod 23, and further driving the first plug body 6 to reciprocate, realizing the push-pull movement of the first plug body 6.

[0050] As Figure 1 、 Figure 2 and Figure 8 shown, in one embodiment, the push-pull plate 24 includes a connecting plate 2401 and a lapping plate 2402. The connecting plate 2401 is fixedly connected to the bottoms of the two connecting rods 23. The lapping plate 2402 is fixedly connected to the surface of the connecting plate 2401. The lapping plate 2402 is adapted to the lapping groove 29. It should be understood that during the process of the rotating seat 28 rotating and butting against the push-pull plate 24, the lapping groove 29 on the rotating seat 28 will lap on the lapping plate 2402, realizing the connection between the end of the rotating seat 28 and the push-pull plate 24.

[0051] As Figures 5 to 7As shown, in one embodiment, an installation cavity 34 is formed at the top of the support base 15. A end cover 3401 is fixedly connected to the top end of the installation cavity 34. The end cover 3401 is fixedly connected to the bottom of the connecting rod 16. A moving plate 35 is slidably arranged inside the installation cavity 34. A second support spring 36 is fixedly connected between the moving plate 35 and the inner wall of the installation cavity 34. Three arc-shaped plates 37 distributed in an annular array are fixedly connected to the top of the moving plate 35. Three arc-shaped grooves 38 are formed at the top of the end cover 3401. The three arc-shaped plates 37 are inserted into the three arc-shaped grooves 38 and the top is in contact with the bottom of the first plug body 6. It should be understood that during the process of the first plug body 6 moving away from the second plug body 7, the second support spring 36 will push the moving plate 35, and the moving plate 35 will push the arc-shaped plate 37 to extend out of the arc-shaped groove 38. During the process of the support base 15 continuing to rotate driven by the first motor 13, the arc-shaped plate 37 will stir the gas above the support base 15, thereby realizing the stirring of the gas between the first plug body 6 and the second plug body 7, which is beneficial to the mixing of the gas.

[0052] As Figure 5 , Figure 6 , Figure 7 and Figure 9 As shown, in one embodiment, a first ventilation hole 39 is formed on the surface of the moving plate 35. A second ventilation hole 40 is formed on the inner bottom surface of the connection groove 14. A third ventilation hole 44 is formed on the inner bottom surface of the installation cavity 34. There is a gap between the support base 15 and the inner bottom surface of the connection groove 14. By providing the first ventilation hole 39, the third ventilation hole 44 and the second ventilation hole 40, pressure relief is provided for the movement of the moving plate 35 in the installation cavity 34, so that external gas can enter the connection groove 14 after passing through the second ventilation hole 40 and the third ventilation hole 44, and the gas in the installation cavity 34 can freely pass through the moving plate 35 through the first ventilation hole 39.

[0053] As Figure 1 As shown, in one embodiment, annular grooves are formed on the surfaces of both the first plug body 6 and the second plug body 7. A sealing ring 41 is sleeved inside each annular groove. The sealing ring 41 is in contact with the inner wall of the dilution tank 1. It should be understood that by providing the sealing ring 41, the contact gap between the piston and the dilution tank 1 is sealed.

[0054] Similarly, a through hole 42 for the connecting rod 23 to pass through will be formed on the second plug body 7, and a sealing ring can be provided in the through hole 42 to seal the gap between the through hole 42 and the connecting rod 23.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas dilution device for gas sensor detection, comprising a dilution tank (1), the top of the dilution tank (1) is communicated with an air injection component and an exhaust pipe (2), an exhaust valve (4) and a flow meter (3) are sequentially installed on the exhaust pipe (2), and the port of the exhaust pipe (2) is communicated with a gas sensor main body (43), characterized in that: It further includes a piston, a communication port (5), a docking assembly, and a push-pull assembly. The piston is slidably disposed at the top inside the dilution tank (1). The piston includes a first plug body (6) and a second plug body (7). A first support spring (8) is disposed between the second plug body (7) and the inner bottom surface of the dilution tank (1). The communication port (5) is opened at the top of the first plug body (6). The docking assembly threadedly docks the first plug body (6) with the second plug body (7) and blocks the communication port (5). The push-pull assembly is used to push and pull the first plug body (6) inside the dilution tank (1). An opening (101) is opened at the bottom end of the dilution tank (1).

2. The gas dilution device for gas sensor detection according to claim 1, characterized in that: The gas injection assembly includes a communication chamber (9). The communication chamber (9) is fixedly communicated with the top of the dilution tank (1). A first gas injection pipe (10) and a second gas injection pipe (11) are fixedly communicated with the surface of the communication chamber (9). Gas injection valves (12) are installed on the surfaces of the first gas injection pipe (10) and the second gas injection pipe (11).

3. A gas dilution device for gas sensor detection according to claim 1, characterized in that: The docking assembly includes a first motor (13) and a connection groove (14). The first motor (13) is fixedly installed at the bottom of the second plug body (7). The connection groove (14) is opened at the top of the second plug body (7). A support seat (15) is rotatably connected inside the connection groove (14). The bottom of the support seat (15) is fixedly connected to the output end of the first motor (13). A connecting rod (16) is fixedly connected to the top of the support seat (15). A threaded body (17) is fixedly connected to the surface of the connecting rod (16). A threaded groove (18) is opened inside the communication port (5). The threaded body (17) is threadedly connected to the threaded groove (18). The top of the connecting rod (16) is flush with the top of the first plug body (6). A ring-shaped pressure relief groove (19) is further opened at the top of the second plug body (7). A ring-shaped pressure relief cover (20) is slidably connected inside the ring-shaped pressure relief groove (19). A third support spring (21) is fixedly connected between the ring-shaped pressure relief cover (20) and the ring-shaped pressure relief groove (19). A pressure relief hole (22) is opened on the inner bottom surface of the ring-shaped pressure relief groove (19).

4. The gas dilution device for gas sensor detection according to claim 3, characterized in that: The push-pull assembly includes two connecting rods (23). The tops of the two connecting rods (23) sequentially penetrate through the bottom end of the dilution tank (1) and the second plug body (7) and are fixedly connected to the bottom of the first plug body (6). The bottoms of the two connecting rods (23) are fixedly connected to a push-pull plate (24).

5. A gas dilution device for gas sensor detection according to claim 4, characterized in that: It further includes a support frame (25). The support frame (25) includes a base (2501) and side plates (2502). A connecting frame (2503) is fixedly connected to the surface of the side plate (2502). The connecting frame (2503) is fixedly sleeved on the surface of the dilution tank (1).

6. The gas dilution device for gas sensor detection according to claim 5, characterized in that: A slide rail is also fixedly connected to the side plate (2502). A moving seat (26) is slidably arranged on the surface of the slide rail. A connecting seat (27) is fixedly connected to the front surface of the moving seat (26). A rotating seat (28) is rotatably connected to the end of the connecting seat (27). A lapping groove (29) is formed at the end of the rotating seat (28). A second motor (30) is fixedly connected to the top of the connecting seat (27). The output end of the second motor (30) is fixedly connected to the connecting seat (27) coaxially. A threaded sleeve (31) is fixedly connected to the side wall of the moving seat (26). A reciprocating lead screw (32) is threadedly connected to the inside of the threaded sleeve (31). A third motor (33) is arranged at the bottom end of the reciprocating lead screw (32). The third motor (33) is fixedly installed on the top of the base (2501), and the output end is fixedly connected to the reciprocating lead screw (32).

7. A gas dilution device for gas sensor detection according to claim 6, characterized in that: The push-pull plate (24) includes a connecting plate (2401) and a lapping plate (2402). The connecting plate (2401) is fixedly connected to the bottoms of the two connecting rods (23). The lapping plate (2402) is fixedly connected to the surface of the connecting plate (2401). The lapping plate (2402) is adapted to the lapping groove (29).

8. The gas dilution device for gas sensor detection according to claim 3, characterized in that: An installation cavity (34) is formed at the top of the support seat (15). An end cover (3401) is fixedly connected to the top end of the installation cavity (34). The end cover (3401) is fixedly connected to the bottom of the connecting rod (16). A moving plate (35) is slidably arranged inside the installation cavity (34). A second support spring (36) is fixedly connected between the moving plate (35) and the inner wall of the installation cavity (34). Three arc-shaped plates (37) distributed in a circular array are fixedly connected to the top of the moving plate (35). Three arc-shaped grooves (38) are formed at the top of the end cover (3401). The three arc-shaped plates (37) are inserted into the three arc-shaped grooves (38), and the tops are in contact with the bottom of the first plug body (6).

9. The gas dilution device for gas sensor detection according to claim 8, characterized in that: A first ventilation hole (39) is formed on the surface of the moving plate (35). A second ventilation hole (40) is formed on the inner bottom surface of the connecting groove (14). A third ventilation hole (44) is formed on the inner bottom surface of the installation cavity (34). A gap exists between the support seat (15) and the inner bottom surface of the connecting groove (14).

10. A gas dilution device for gas sensor detection according to any one of claims 1 to 9, characterized in that: Circular grooves are formed on the surfaces of the first plug body (6) and the second plug body (7). Sealing rings (41) are sleeved inside the circular grooves. The sealing rings (41) are in contact with the inner wall of the dilution tank (1).

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