A gas dilution device for gas sensor detection

Abstract

The present invention provides a gas dilution device for gas sensor detection, comprising a dilution tank, a piston, a connecting port, a docking assembly, and a push-pull assembly. The piston is slidably arranged at the top end of the dilution tank. The piston comprises a first plug body and a second plug body. A first supporting spring is provided between the second plug body and the bottom surface of the dilution tank. The connecting port is opened at the top of the first plug body. The docking assembly connects the first plug body and the second plug body by thread and blocks the connecting port. The push-pull assembly is used to push and pull the first plug body in the dilution tank. According to the present invention, after mixing the high-concentration standard gas with the dilution gas, the first plug body is repeatedly pushed and pulled. The gas flows in the connecting port, forming a turbulent shear force, breaking the stratified interface. The stratified gas flows in the connecting port, which is conducive to achieving uniform mixing and ensuring that the low-concentration standard gas collected by the gas sensor is a 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] Dilution of standard gas is a key technical link in the detection of technical indicators such as sensitivity, response time, selectivity, and detection limit of gas sensors. In the process of diluting the standard gas, a certain amount of high-concentration standard gas and a certain amount of dilution gas are introduced, and then the introduced high-concentration standard gas is mixed with the dilution gas to complete the dilution, and then connected to the gas sensor body through the flow meter. However, after the dilution of the high and low concentration standard gases, the diluted mixed gas will be stored in the dilution tank. If the molecular weight difference between the dilution gas and the target gas is too large, the gravity will cause the light component to float up and the heavy component to sink when it is left stationary for a long time, forming a concentration gradient stratification. It is directly introduced into the gas sensor body for detection. The stratification causes the gas to form a concentration gradient in the pipeline, and the gas sensor body captures non-uniform concentration samples during local sampling. Summary of the Invention

[0003] In view of this, the present invention aims to propose a gas dilution device for gas sensor detection to solve the problem that after diluting high and low concentration standard gases, the diluted mixed gas will be stored in a dilution tank. If the molecular weight difference between the diluted gas and the target gas is too large, the gravity will cause the light component to float up and the heavy component to sink when it is left still for a long time, forming a concentration gradient stratification. The gas is directly passed into the gas sensor for detection. The stratification causes the gas to form a concentration gradient 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 achieved as follows:

[0005] A gas dilution device for gas sensor detection includes a dilution tank, the top of the dilution tank is connected to a gas injection assembly and an exhaust pipe, the exhaust pipe is sequentially installed with an exhaust valve and a flow meter, the exhaust pipe port is connected to the gas sensor body, and also includes a piston, a connecting port, a docking assembly and a push-pull assembly, the piston is slidably arranged at the top of the inside of 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 of the dilution tank, the connecting port is opened at the top of the first plug body, the docking assembly threadedly docks the first plug body with the second plug body and blocks the connecting port, the push-pull assembly is used to push and pull the first plug body in the dilution tank, and the bottom end of the dilution tank is opened.

[0006] Furthermore, the gas injection assembly includes a connecting 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 on the surface of the connecting chamber, and gas injection valves are installed on the surfaces of the first gas injection pipe and the second gas injection pipe.

[0007] Furthermore, the docking assembly includes a first motor and a connecting groove, the first motor is fixedly mounted on the bottom of the second plug body, the connecting groove is provided at the top of the second plug body, a support seat is rotatably connected in the connecting 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 provided in the communicating port, the threaded body is threadedly connected to the threaded groove, and the top of the connecting rod is flush with the top of the first plug body;

[0008] An annular pressure relief groove is also provided on the top of the second plug body, an annular pressure relief cover is slidably connected to the annular pressure relief groove, a third support spring is fixedly connected between the annular pressure relief cover and the annular pressure relief groove, and a pressure relief hole is provided on the inner bottom surface of the annular pressure relief groove.

[0009] Furthermore, the push-pull assembly includes two connecting rods, the top ends of the two connecting rods sequentially pass 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, and the bottom ends of the two connecting rods are fixedly connected to the push-pull plates.

[0010] Furthermore, it also includes a support frame, which includes a base and side plates. A connecting frame is fixedly connected to the surface of the side plates, and the connecting frame is fixedly sleeved on the surface of the dilution tank.

[0011] Furthermore, the side panel is fixedly connected to a slide rail, a movable seat is slidably provided on the surface of the slide rail, a connecting seat is fixedly connected to the front of the movable seat, the end of the connecting seat is rotatably connected to the rotating seat, a lap groove is provided at the end of the rotating seat, the top of the connecting seat is fixedly connected to a second motor, the output end of the second motor is coaxially fixedly connected to the connecting seat, a threaded sleeve is fixedly connected to the side wall of the movable seat, the internal thread of the threaded sleeve is connected to a reciprocating screw, and a third motor is provided at the bottom end of the reciprocating screw, the third motor is fixedly mounted on the top of the base, and the output end is fixedly connected to the reciprocating screw.

[0012] Furthermore, the push-pull plate includes a connecting plate and a lap plate, the connecting plate is fixedly connected to the bottom of the two connecting rods, the lap plate is fixedly connected to the surface of the connecting plate, and the lap plate is adapted to the lap groove.

[0013] Furthermore, an installation cavity is provided at the top of the support seat, an end cover is fixedly connected to the top of the installation cavity, the end cover is fixedly connected to the bottom of the connecting rod, a movable plate is slidingly provided inside the installation cavity, a second supporting spring is fixedly connected between the movable 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 movable plate, three arc-shaped grooves are provided at the top of the end cover, the three arc-shaped plates are inserted into the three arc-shaped grooves, and the tops are in contact with the bottom of the first plug body.

[0014] Furthermore, a first vent hole is provided on the surface of the movable plate, a second vent hole is provided on the inner bottom surface of the connecting groove, a third vent hole is provided on the inner bottom surface of the installation cavity, and there is a gap between the support seat and the inner bottom surface of the connecting groove.

[0015] Furthermore, annular grooves are formed on the surfaces of the first plug body and the second plug body, and sealing rings are sleeved inside the annular grooves, and 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 described in the present invention has the following advantages:

[0017] (1) According to the present invention, after the high-concentration standard gas is mixed with the dilution gas, the threaded connection between the first plug body and the second plug body is cancelled by the docking assembly, and then the first plug body is pushed and pulled by the push-pull assembly. In the process of pushing the first plug body upward, the gas above the piston will move to between the first plug body and the second plug body through the connecting port. In 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 to the top of the first plug body through the connecting port. The first plug body is repeatedly pushed and pulled, and the gas flows in the connecting port, forming a turbulent shear force, breaking the stratified interface. The stratified gas flows in the connecting port, which is conducive to achieving uniform mixing and ensuring that the low-concentration standard gas collected by the gas sensor is a uniformly mixed standard gas.

[0018] (2) According to the present invention, by providing the thread groove, when the mixed gas passes through the connecting port, the mixed gas will generate vortexes under the drainage effect of the thread groove. The vortexes induce three-dimensional turbulence through rotational motion, destroying the gas stratification boundary layer, which is conducive to gas mixing.

[0019] By connecting the connecting rod and the threaded body as a whole with the connecting port, the stable connection between the first plug body and the second plug body is ensured during the initial gas injection process, and the connecting port is blocked to avoid gas accumulation in the connecting port. This ensures that the top of the piston discharges the gas at the top of the dilution tank before gas injection. After the gas injection and mixing, before the sampled gas detects the gas sensor body, the threaded connection between the threaded body and the threaded groove in the connecting port is canceled, and the connecting port is opened, providing conditions for the first plug body to push and pull above the second plug body.

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

[0021] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

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

[0023] Figure 2 for Figure 1 Enlarged view of part A;

[0024] Figure 3 This is a structural cross-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 This is a structural cross-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 This is a structural cross-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 This is an exploded view of a support base, a mounting cavity, an end cover, and a movable plate of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

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

[0029] Figure 8This is a structural schematic diagram of the overlapping state of the push-pull plate and the overlapping groove of a gas dilution device for gas sensor detection according to an embodiment of the present invention;

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

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

[0032] Description of reference numerals:

[0033] 1-dilution tank; 101-opening; 2-exhaust pipe; 3-flow meter; 4-exhaust valve; 5-connecting port; 6-first plug body; 7-second plug body; 8-first support spring; 9-connecting chamber; 10-first gas injection pipe; 11-second gas injection pipe; 12-gas injection valve; 13-first motor; 14-connecting groove; 15-support seat; 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-connecting plate; 240 2-lap plate; 25-support frame; 2501-base; 2502-side plate; 2503-connecting frame; 26-movable seat; 27-connecting seat; 28-rotating seat; 29-lap groove; 30-second motor; 31-threaded sleeve; 32-reciprocating screw; 33-third motor; 34-installation cavity; 3401-end cover; 35-movable plate; 36-second support spring; 37-arc plate; 38-arc groove; 39-first vent; 40-second vent; 41-sealing ring; 42-through-hole; 43-gas sensor body; 44-third vent. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as limiting 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 indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

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

[0038] like Figures 1 to 10 As shown, in one embodiment, a gas dilution device for gas sensor detection includes a dilution tank 1, the top of the dilution tank 1 is connected to a gas injection assembly and an exhaust pipe 2, an exhaust valve 4 and a flowmeter 3 are installed on the exhaust pipe 2 in sequence, the exhaust pipe 2 port is connected to the gas sensor body 43, and also includes a piston, a connecting port 5, a docking assembly and a push-pull assembly, the piston is slidably arranged at the top of the inside of the dilution tank 1, the piston includes a first plug body 6 and a second plug body 7, a first support spring 8 is arranged between the second plug body 7 and the bottom surface of the dilution tank 1, the connecting port 5 is opened at the top of the first plug body 6, the docking assembly threadedly connects the first plug body 6 with the second plug body 7, and blocks the connecting port 5, the push-pull assembly is used to push and pull the first plug body 6 in the dilution tank 1, and the bottom end of the dilution tank 1 is opened with an opening 101.

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

[0040] After the high-concentration standard gas is mixed with the dilution gas, the threaded connection between the first plug body 6 and the second plug body 7 is removed by the docking assembly, and then the first plug body 6 is pushed and pulled by the push-pull assembly. In the process of pushing the first plug body 6 upward, the gas above the piston will move to between the first plug body 6 and the second plug body 7 through the connecting port 5. In 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 to the top of the first plug body 6 through the connecting port 5. The first plug body 6 is repeatedly pushed and pulled, and the gas flows in the connecting port 5, forming a turbulent shear force, breaking the stratified interface. The stratified gas flows in the connecting port 5, which is conducive to achieving uniform mixing;

[0041] Then, open the exhaust valve 4, and the piston will reset under the support of the first support spring 8, pushing the mixed gas upward. With the exhaust pipe 2 connected, 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 reduced concentration, which is conducive to ensuring that the collected low-concentration standard gas is a uniformly mixed standard gas.

[0042] like Figure 1 and Figure 3 As shown, in one embodiment, the gas injection assembly includes a communication chamber 9, which is fixedly connected to the top 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 the first gas injection pipe 10 and the second gas injection pipe 11. It should be understood that when gas injection is required, the first gas injection pipe 10 or the second gas injection pipe 11 can be selected for injection, and the gas injection amount can be controlled by opening the gas injection valve 12.

[0043] like Figures 3 to 5 As shown, in one embodiment, the docking assembly includes a first motor 13 and a connecting groove 14. The first motor 13 is fixedly mounted on the bottom of the second plug body 7. The connecting groove 14 is opened at the top of the second plug body 7. A support seat 15 is rotatably connected in the connecting 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] An annular pressure relief groove 19 is also provided on the top of the second plug body 7, and an annular pressure relief cover 20 is slidably connected to 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, and 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 the high-concentration standard gas and the dilution gas are injected into the dilution tank 1, the piston will move to the bottom end of the dilution tank 1, compressing the first support spring 8, and then starting the first motor 13. The first motor 13 will drive the connecting rod 16 to rotate, and the connecting rod 16 will be threadedly 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. When the thread groove 18 and the threaded body 17 are not disengaged and the first plug body 6 is away from the second plug body 7, negative pressure will be generated between the first plug body 6 and the second plug body 7, and the external atmosphere will enter the annular pressure relief groove 19 through the pressure relief hole 22, pushing the annular pressure relief cover 20 out of the annular pressure relief groove 19, and balancing the air pressure between the first plug body 6 and the second plug body 7. After 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 pass through the connecting port 5 and enter between the first plug body 6 and the second plug body 7;

[0045] By providing the thread groove 18, when the mixed gas passes through the connecting port 5, the mixed gas will generate eddy currents under the drainage action of the thread groove 18. The eddy currents induce three-dimensional turbulence through rotational motion, destroying the gas stratification boundary layer, which is conducive to gas mixing.

[0046] By connecting the connecting rod 16 and the threaded body 17 as a whole with the connecting 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 connecting port 5 is blocked to avoid the existence of gas in the connecting port 5, ensuring that before gas injection, the top of the piston discharges the gas at the top of the dilution tank 1. After the gas injection and mixing, before the sampled gas detects the gas sensor body 43, the threaded connection between the threaded body 17 and the threaded groove 18 in the connecting port 5 is cancelled, and the connecting port 5 is opened, providing conditions for the first plug body 6 to push and pull movement above the second plug body 7.

[0047] like 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 top ends of the two connecting rods 23 sequentially pass 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 bottom ends of the two connecting rods 23 are fixedly connected to a push-pull plate 24. It should be understood that after the first plug body 6 and the second plug body 7 are unmated, the push-pull plate 24 can be moved to drive the connecting rods 23 to move, and the connecting rods 23 drive the first plug body 6 to move, thereby achieving push-pull movement of the first plug body 6.

[0048] like Figure 1 As shown, in one embodiment, a support frame 25 is further included, and the support frame 25 includes a base 2501 and a side plate 2502. A connecting frame 2503 is fixedly connected to the surface of the side plate 2502, and 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] like Figure 1 、 Figure 2 and Figure 8 As shown, in one embodiment, a slide rail is also fixedly connected to the side panel 2502, and a movable seat 26 is slidingly provided on the surface of the slide rail. A connecting seat 27 is fixedly connected to the front of the movable seat 26, and the end of the connecting seat 27 is rotatably connected to the rotating seat 28. A lap groove 29 is provided at the end of the rotating seat 28. A second motor 30 is fixedly connected to the top of the connecting seat 27, and the output end of the second motor 30 is coaxially fixedly connected to the connecting seat 27. A threaded sleeve 31 is fixedly connected to the side wall of the movable seat 26, and the internal thread of the threaded sleeve 31 is connected to a reciprocating screw rod 32. A third motor 33 is provided at the bottom end of the reciprocating screw rod 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 screw rod 32. It should be understood that when the push-pull plate 24 needs to be pushed and adjusted, the second motor 30 can be started, and the second motor 30 drives the rotating seat 28 to rotate. The overlapping groove 29 of the rotating seat 28 will overlap the end of the push-pull plate 24 to form a docking, and then the third motor 33 is started. The third motor 33 will drive the reciprocating screw 32 to rotate, and the reciprocating screw 32 will drive the threaded sleeve 31 to move back and forth, and then drive 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 then drive the first plug body 6 to move back and forth, realizing the push-pull movement of the first plug body 6.

[0050] like Figure 1 、 Figure 2 and Figure 8 As shown, in one embodiment, the push-pull plate 24 includes a connecting plate 2401 and a lap plate 2402. The connecting plate 2401 is fixedly connected to the bottom of the two connecting rods 23, and the lap plate 2402 is fixedly connected to the surface of the connecting plate 2401. The lap plate 2402 is adapted to the lap groove 29. It should be understood that when the rotating base 28 rotates to connect with the push-pull plate 24, the lap groove 29 on the rotating base 28 will overlap the lap plate 2402, thereby connecting the end of the rotating base 28 to the push-pull plate 24.

[0051] like Figures 5 to 7As shown, in one embodiment, a mounting cavity 34 is provided at the top of the support seat 15, and an end cover 3401 is fixedly connected to the top of the mounting cavity 34, and the end cover 3401 is fixedly connected to the bottom of the connecting rod 16. A movable plate 35 is slidingly provided inside the mounting cavity 34, and a second supporting spring 36 is fixedly connected between the movable plate 35 and the inner wall of the mounting cavity 34. Three arc plates 37 distributed in a ring array are fixedly connected to the top of the movable plate 35, and three arc grooves 38 are provided on the top of the end cover 3401. The three arc plates 37 are inserted into the three arc grooves 38, and the top is in contact with the bottom of the first plug body 6. It should be understood that in the process of the first plug body 6 and the second plug body 7 moving away from each other, the second support spring 36 will push the movable plate 35, and the movable plate 35 will push the arc plate 37 to extend out of the arc groove 38. In the process of the first motor 13 continuing to drive the support seat 15 to rotate, the arc plate 37 will stir the gas above the support seat 15, thereby stirring the gas between the first plug body 6 and the second plug body 7, which is beneficial to the mixing of the gases.

[0052] like Figure 5 、 Figure 6 、 Figure 7 and Figure 9 As shown, in one embodiment, a first vent hole 39 is defined on the surface of the movable plate 35, a second vent hole 40 is defined on the inner bottom surface of the connecting groove 14, and a third vent hole 44 is defined on the inner bottom surface of the mounting cavity 34. A gap is provided between the support base 15 and the inner bottom surface of the connecting groove 14. By providing the first vent hole 39, the third vent hole 44, and the second vent hole 40, pressure is relieved when the movable plate 35 moves within the mounting cavity 34, allowing external air to enter the connecting groove 14 through the second vent hole 40 and the third vent hole 44, while the air within the mounting cavity 34 can freely pass through the movable plate 35 through the first vent hole 39.

[0053] like Figure 1 As shown, in one embodiment, an annular groove is formed on the surface of the first plug body 6 and the second plug body 7. A sealing ring 41 is sleeved inside the annular groove, and the sealing ring 41 contacts the inner wall of the dilution tank 1. It should be understood that the provision of the sealing ring 41 seals the contact gap between the piston and the dilution tank 1.

[0054] Similarly, a through hole 42 for the connecting rod 23 to pass through is opened 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 description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas dilution device for gas sensor detection, comprising a dilution tank (1), the top end of the dilution tank (1) being connected to a gas injection assembly and an exhaust pipe (2), an exhaust valve (4) and a flow meter (3) being sequentially mounted on the exhaust pipe (2), a port of the exhaust pipe (2) being connected to a gas sensor body (43), and characterized in that: The invention also includes a piston, a communication port (5), a docking assembly and a push-pull assembly. The piston is slidably arranged at the top end of the dilution tank (1). The piston includes a first plug body (6) and a second plug body (7). A first support spring (8) is arranged between the second plug body (7) and the 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 threadably 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) in the dilution tank (1). The bottom end of the dilution tank (1) is provided with an opening (101).

2. A gas dilution device for gas sensor detection according to claim 1, characterized in that: The gas injection assembly comprises a communication chamber (9), the communication chamber (9) is fixedly connected to the top of the dilution tank (1), a first gas injection pipe (10) and a second gas injection pipe (11) are fixedly connected on the surface of the communication chamber (9), and 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 comprises a first motor (13) and a connecting groove (14), wherein the first motor (13) is fixedly mounted on the bottom of the second plug body (7), the connecting groove (14) is provided at the top of the second plug body (7), a support seat (15) is rotatably connected in the connecting 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), the surface of the connecting rod (16) is fixedly connected to a threaded body (17), a threaded groove (18) is provided in the communicating port (5), the threaded body (17) is threadedly connected to the threaded groove (18), and the top of the connecting rod (16) is flush with the top of the first plug body (6); An annular pressure relief groove (19) is also provided on the top of the second plug body (7), an annular pressure relief cover (20) is slidably connected to 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), and a pressure relief hole (22) is provided on the inner bottom surface of the annular pressure relief groove (19).

4. A gas dilution device for gas sensor detection according to claim 3, characterized in that: The push-pull assembly comprises two connecting rods (23), the top ends of the two connecting rods (23) sequentially passing through the bottom end of the dilution tank (1) and the second plug body (7) and then fixedly connected to the bottom end of the first plug body (6), and the bottom ends 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: The device further comprises a support frame (25), the support frame (25) comprising a base (2501) and a side plate (2502), a connecting frame (2503) being fixedly connected to the surface of the side plate (2502), and the connecting frame (2503) being fixedly sleeved on the surface of the dilution tank (1).

6. A gas dilution device for gas sensor detection according to claim 5, characterized in that: The side plate (2502) is also fixedly connected to a slide rail, and a movable seat (26) is slidably provided on the surface of the slide rail. The front of the movable seat (26) is fixedly connected to a connecting seat (27), and the end of the connecting seat (27) is rotatably connected to a rotating seat (28). The end of the rotating seat (28) is provided with a lap groove (29). The top of the connecting seat (27) is fixedly connected to a second motor (30), and the output end of the second motor (30) is coaxially fixedly connected to the connecting seat (27). A threaded sleeve (31) is fixedly connected to the side wall of the movable seat (26), and the internal thread of the threaded sleeve (31) is connected to a reciprocating screw rod (32). The bottom end of the reciprocating screw rod (32) is provided with a third motor (33), and the third motor (33) is fixedly mounted on the top of the base (2501), and the output end is fixedly connected to the reciprocating screw rod (32).

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

8. The gas dilution device for gas sensor detection according to claim 3, characterized in that: The support seat (15) is provided with a mounting cavity (34) at the top, an end cover (3401) is fixedly connected to the top of the mounting cavity (34), the end cover (3401) is fixedly connected to the bottom of the connecting rod (16), a movable plate (35) is slidably provided inside the mounting cavity (34), a second supporting spring (36) is fixedly connected between the movable plate (35) and the inner wall of the mounting cavity (34), three arc-shaped plates (37) distributed in a ring array are fixedly connected to the top of the movable plate (35), three arc-shaped grooves (38) are provided 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 of the three arc-shaped plates (37) 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 vent hole (39) is provided on the surface of the movable plate (35), a second vent hole (40) is provided on the inner bottom surface of the connecting groove (14), a third vent hole (44) is provided on the inner bottom surface of the mounting cavity (34), and a gap is provided 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: Annular grooves are provided on the surfaces of the first plug body (6) and the second plug body (7), and sealing rings (41) are sleeved inside the annular grooves. The sealing rings (41) are in contact with the inner wall of the dilution tank (1).

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