A dual-air pump gas detector

Abstract

The present application relates to a dual-pump gas detector, which includes a frame; a first air pump, the air inlet of the first air pump being connected to an external air source; a buffer air box, the buffer air box being connected to the air outlet of the first air pump; an exhaust balance pipe, one end of which is connected to the buffer air box and is connected to a throttle valve; a second air pump, the air inlet of the second air pump being connected to the buffer air box; a plurality of detection air boxes, each of which is connected to a detection air inlet pipe and a detection air outlet pipe; and a connection switching assembly for connecting the air outlet of the second air pump to one of the detection air inlet pipes. The present application has the effect of enabling the gas detector to detect multiple gases.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and in particular to a dual-air pump gas detector. Background Art

[0002] During the production process, inspectors will frequently test and analyze the composition and concentration of toxic and harmful gases in the air of the workplace so that they can take appropriate measures to control them in a timely manner.

[0003] In the related art, the dual-air pump gas detector includes a frame, a first air pump, a gas buffer box, a second air pump, a detection air box and an exhaust balance pipe. The first air pump is arranged on the frame, and the air inlet of the first air pump is connected to a distant gas source through a pipeline; the gas buffer box is arranged on the frame, and the gas buffer box is connected to the air outlet of the first air pump; the second air pump is arranged on the frame, and the air inlet of the second air pump is connected to the gas buffer box, and the working flow of the second air pump is less than the working flow of the first air pump; the detection air box is arranged on the frame, and the detection air box is connected to the air outlet of the second air pump, and the detection air box is also connected to an exhaust pipe; one end of the exhaust balance pipe is connected to the gas buffer box, and the other end discharges gas, and a throttle valve is installed on the exhaust balance pipe.

[0004] When performing gas detection, the gas from a distance is first guided to the gas buffer box by the first air pump, and then part of the gas in the gas buffer box is guided to the detection gas box by the second air pump, and the other part is discharged to the outside through the exhaust balance pipe. The gas is then detected in the detection gas box, and finally the gas is discharged to the outside through the exhaust pipe, thereby achieving the purpose of gas detection through dual air pumps.

[0005] Regarding the above-mentioned related technologies, there is a defect that different types of gases require different detection gas boxes, which leads to the defect that the gas detector cannot detect multiple gases. Summary of the Invention

[0006] In order to enable a gas detector to detect multiple gases, the present application provides a dual-air pump gas detector.

[0007] The dual-air pump gas detector provided in this application adopts the following technical solution:

[0008] A dual-air pump gas detector, comprising:

[0009] frame;

[0010] a first air pump, wherein an air inlet of the first air pump is connected to an external air source;

[0011] a buffer air box, the buffer air box being connected to the air outlet of the first air pump;

[0012] An exhaust balance pipe, one end of which is connected to the buffer gas box, and a throttle valve is connected to the exhaust balance pipe;

[0013] a second air pump, wherein an air inlet of the second air pump is connected to the buffer air tank;

[0014] There are multiple detection air boxes, each of which is connected to a detection air inlet pipe and a detection air outlet pipe;

[0015] The connection switching component is used to connect the air outlet of the second air pump with one of the detection air inlet pipes.

[0016] By adopting the above technical solution, when performing gas detection, the gas is first led to the buffer gas box through the first air pump until the gas in the buffer gas box reaches a predetermined concentration, and then the gas is led to one of the detection gas boxes through the second air pump, and the exhaust balance pipe is opened at the same time. Then, part of the gas will enter the detection gas box for detection, and the other part of the gas will be discharged outside the equipment, thereby achieving the purpose of gas detection. At the same time, this design method can also connect the outlet of the second air pump with any detection inlet pipe through the connecting switching component, so that different gases can be sent to different detection gas boxes, thereby achieving the purpose of enabling the gas detector to detect multiple gases.

[0017] Preferably, the connectivity switching component includes:

[0018] A fixed communication block is provided on the frame, wherein the fixed communication block is provided with a plurality of fixed communication holes, and the plurality of fixed communication holes are respectively connected to the plurality of detection air inlet pipes;

[0019] a movable communication block, slidably disposed on the frame, the movable communication block abutting against a surface of a side of the fixed communication block away from the detection air intake pipe, the movable communication block being provided with a movable communication hole communicating with the fixed communication hole;

[0020] a connecting hose, one end of which is connected to the air outlet of the second air pump, and the other end of which is connected to the movable communication block, wherein the connecting hose is connected to the movable communication hole;

[0021] The switching driving member is connected with the moving communication block.

[0022] By adopting the above technical solution, when the second air pump needs to be switched to connect different detection air boxes, the mobile connecting block can be moved back and forth by switching the driving member. In this process, the mobile connecting hole on the mobile connecting block is connected with different fixed connecting holes respectively. After the mobile connecting hole is connected with the corresponding fixed connecting hole, the switching driving member is closed. At this time, the second air pump is connected with the corresponding detection air inlet pipe, thereby achieving the purpose of making different gases flow into different detection air boxes.

[0023] Preferably, the switching drive member includes:

[0024] An abutment block is slidably arranged on the frame, and two abutment blocks are provided, and the two abutment blocks respectively abut against two ends of the movable communication block along its own movement direction;

[0025] The telescopic cylinder is arranged on the frame. There are two telescopic cylinders. The piston rods of the two telescopic cylinders are respectively connected to the two abutment blocks.

[0026] By adopting the above technical solution, when the mobile connecting block is to be made to perform reciprocating linear motion, the piston rod of one of the telescopic cylinders can be extended and the piston rod of the other telescopic cylinder can be retracted, so the piston rod of the telescopic cylinder and the mobile connecting block only need to be kept in contact through the abutment block. When the connection between the mobile connecting block and the fixed connecting block needs to be maintained, the connection between the mobile connecting block and the telescopic cylinder can be quickly released, thereby making the maintenance work of the equipment more convenient.

[0027] Preferably, the surface where the abutting block abuts against the movable communicating block is set as a limiting sealing surface, and the limiting sealing surface is arranged to be inclined, and the limiting sealing surface faces the position where the fixed communicating block is located.

[0028] By adopting the above technical solution, due to the setting of the limiting sealing surface, in the process of the abutment block pushing the mobile connecting block, the abutment block can not only apply a force in the direction of its movement to the mobile connecting block through the limiting sealing surface, but also apply a force toward the fixed connecting block to the mobile connecting block, so the tightness between the surfaces of the one side where the mobile connecting block and the fixed connecting block abut each other can be improved, thereby improving the air tightness of the connection between the mobile connecting block and the fixed connecting block.

[0029] Preferably, the fixed connecting block is connected to a first sealing rack, which is located on the outside of the fixed connecting hole, and the tooth thickness direction of the first sealing rack is parallel to the movement direction of the movable connecting block; the movable connecting block is connected to a second sealing rack, which is located on the outside of the movable connecting hole, and the second sealing rack is meshed with the first sealing rack.

[0030] By adopting the above technical solution, due to the setting of the first sealing rack and the second sealing rack, it will not affect the movement of the movable connecting block on the outer surface of the fixed connecting block, and can also make the abutment gap between the movable connecting block and the fixed connecting block into a bent shape, so the air tightness of the connection between the movable connecting block and the fixed connecting block can be further improved.

[0031] Preferably, the detection air intake pipe is in the form of a multi-section telescopic tube structure, the section with the largest inner diameter of the detection air intake pipe is connected to the fixed connecting block, and the section with the smallest inner diameter is connected to the detection air box; the frame is provided with a movable slide, the movable slide is fixedly connected to the detection air box, and the movement direction of the movable slide is parallel to the axial direction of the detection air intake pipe; the frame is provided with a movable drive component, and the movable drive component is connected to the movable slide.

[0032] By adopting the above technical solution, when the gas flow flowing into the detection air box needs to be changed, the movable slide can be moved by moving the driving member to change the distance between the detection air box and the fixed connecting block. In this process, the length of the detection air intake pipe will become longer or shorter. At the same time, because the detection air intake pipe is a multi-section telescopic tube structure, the overall flux of the detection air intake pipe will change, thereby changing the gas flow flowing into the detection air box. In addition, with this design, since the section with the largest inner diameter of the detection air intake pipe is connected to the fixed connecting block, and the section with the smallest inner diameter is connected to the detection air box, when the detection air intake pipe is extended, the friction force received from the section with the smaller inner diameter is smaller, so the section with the smaller inner diameter will extend or retract first, thereby facilitating the precise control of the flow into the detection air box.

[0033] Preferably, a partition block is slidingly provided in the buffer air box, and the partition block is sealedly connected to the inner wall of the buffer air box to form a variable air storage cavity, and the variable air storage cavity is connected to the air outlet of the first air pump and the air inlet of the second air pump; one end of the exhaust balance pipe is passed through the partition block to be connected with the variable air storage cavity, and the other end passes through the buffer air box, and the part of the exhaust balance pipe located in the buffer air box is sleeved with a balance spring, one end of the balance spring is connected to the partition block, and the other end is connected to the inner wall of the buffer air box.

[0034] By adopting the above technical solution, due to the setting of the partition block and the balance spring, when the first air pump is started and the second air pump is not started, and the exhaust balance pipe is closed, the gas will first flow into the variable air storage chamber. In the process of the gas gradually flowing into the variable air storage chamber, the partition block will move away from the inner wall opposite to itself, so the volume of the variable air storage chamber will change accordingly. At the same time, the gas concentration in the variable air storage chamber will be maintained within a predetermined range. Compared with the buffer gas box, the chamber is large and constant. With this design, the gas can reach the predetermined concentration in the buffer gas box more quickly, thereby shortening the time for gas detection.

[0035] Preferably, the dividing block is connected to a fixed tube and an elastic telescopic tube, one end of the fixed tube is fixedly connected to the inner wall of the buffer air box, and the fixed tube is communicated with the air outlet of the first air pump and the air inlet of the second air pump; one end of the elastic telescopic tube is connected to the other end of the fixed tube, and the other end of the elastic telescopic tube is connected to the dividing block to form the variable air storage chamber.

[0036] By adopting the above technical solution, due to the setting of the fixed tube and the elastic telescopic tube, a sealed and variable air storage cavity with variable volume will be formed in the buffer air box during the movement of the partition block. Compared with the method in which the partition block is directly and sealedly slidably connected to the inner wall of the buffer air box, this design method can form a sealed variable air storage cavity through a simpler structural form.

[0037] Preferably, an auxiliary pipe is connected between the detection air inlet pipe and the fixed connecting block, the auxiliary pipe is respectively connected to the detection air inlet pipe and the fixed connecting hole, and the auxiliary pipe is provided with a one-way valve; the first air pump is connected to a two-way valve, a working air pipe and a pre-preparation air pipe, and the input end of the two-way valve is connected to the air outlet of the first air pump; one end of the working air pipe is connected to one of the output ends of the two-way valve, and the other end is connected to the detection air box; one end of the pre-preparation air pipe is connected to the other output end of the two-way valve, and the other end is connected to the auxiliary pipe.

[0038] By adopting the above technical solution, before conducting gas detection, the first air pump is first connected to the working air pipe and the pre-preparation air pipe through a two-way valve, and then a part of the gas flows into the buffer air box along the working air pipe to make the gas concentration in the buffer air box reach the predetermined value for starting the second air pump. The other part of the gas enters the auxiliary pipe along the pre-preparation air pipe, and then flows into the detection air box along the detection air inlet pipe. Then, the impurities in the detection air box can be discharged, thereby not only cleaning the detection air box during the gas storage preparation process in the buffer air box, but also improving the detection accuracy during the subsequent operation of the detection air box.

[0039] In summary, this application includes at least one of the following beneficial technical effects:

[0040] 1. By setting the connection switching component, the gas outlet of the second air pump can be connected to any detection air inlet pipe, so that different gases can be sent to different detection gas boxes, thereby enabling the gas detector to detect multiple gases;

[0041] 2. Through the setting of the limiting sealing surface, the abutment block can not only apply a force in the direction of movement to the mobile connecting block through the limiting sealing surface, but also apply a force toward the fixed connecting block to the mobile connecting block, so that the tightness between the surfaces of the mobile connecting block and the fixed connecting block on one side where they abut against each other can be improved, thereby improving the air tightness of the connection between the mobile connecting block and the fixed connecting block. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural diagram of the dual-air pump gas detector in an embodiment of the present application.

[0043] Figure 2 It is a structural diagram of the connectivity switching component in an embodiment of the present application.

[0044] Figure 3 It is a structural diagram of the buffer air box in an embodiment of the present application.

[0045] Explanation of the accompanying drawings: 1. Frame; 11. Moving slide; 12. Moving drive member; 2. First air pump; 21. Two-way valve; 22. Working air pipe; 23. Pre-prepared air pipe; 3. Buffer air box; 31. Partition block; 32. Fixed pipe; 33. Elastic telescopic pipe; 4. Exhaust balance pipe; 41. Throttle valve; 42. Balance spring; 5. Second air pump; 6. Detection air box; 61. Detection air inlet pipe; 62. Detection air outlet pipe; 7. Connecting switching assembly; 71. Fixed connecting block; 711. Fixed connecting hole; 712. First sealing rack; 72. Moving connecting block; 721. Moving connecting hole; 722. Second sealing rack; 73. Connecting hose; 74. Switching drive member; 741. Abutment block; 742. Telescopic cylinder; 743. Limiting sealing surface; 8. Variable air storage chamber; 9. Auxiliary pipe; 91. One-way valve. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1-3 This application is described in further detail.

[0047] The embodiment of the present application discloses a dual-air pump gas detector. Figure 1The dual-air pump gas detector includes a frame 1, a first air pump 2, a buffer air box 3, an exhaust balance pipe 4, a second air pump 5, a detection air box 6 and a connection switching component 7. The first air pump 2 is fixedly installed on the frame 1, and the air inlet of the first air pump 2 is connected to the external air source through a pipeline; the buffer air box 3 is fixedly installed on the frame 1, and the buffer air box 3 is connected to the air outlet of the first air pump 2 through a pipeline; one end of the exhaust balance pipe 4 is connected to the buffer air box 3, and the other end is used to discharge the gas in the buffer air box 3 to the external environment, and at the same time discharge A throttle valve 41 is also connected to the air balance pipe 4; the second air pump 5 is fixedly installed on the frame 1, and the air inlet of the second air pump 5 is connected to the buffer air box 3 through a pipeline; the detection air box 6 is installed on the frame 1, and there are multiple detection air boxes 6, each detection air box 6 is connected to a detection air inlet pipe 61 and a detection air outlet pipe 62; the connecting switching component 7 is connected to the air outlet of the second air pump 5 and multiple detection air inlet pipes 61, and the connecting switching component 7 is used to connect the air outlet of the second air pump 5 to any one of the detection air inlet pipes 61 separately.

[0048] Reference Figure 1 When performing gas detection, the gas is first led to the buffer gas box 3 through the first air pump 2 until the gas in the buffer gas box 3 reaches a predetermined concentration, and then the gas is led to one of the detection gas boxes 6 through the second air pump 5. At the same time, the exhaust balance pipe 4 is opened, and then part of the gas will enter the detection gas box 6 for detection, and the other part of the gas will be discharged outside the equipment, thereby achieving the purpose of gas detection. At the same time, this design method can also connect the outlet of the second air pump 5 with any detection inlet pipe 61 through the connecting switching component 7, so that different gases can be sent to different detection gas boxes 6, and then the gas detector can detect multiple gases.

[0049] Reference Figure 1 and Figure 2 The connecting switch assembly 7 includes a fixed connecting block 71, a movable connecting block 72, a connecting hose 73 and a switching drive member 74. The fixed connecting block 71 is in the shape of a rectangular parallelepiped and is fixedly mounted on the frame 1. The fixed connecting block 71 is provided with a plurality of fixed connecting holes 711. The plurality of fixed connecting holes 711 are evenly distributed along the length direction of the fixed connecting block 71. At the same time, one side surface of the fixed connecting block 71 is connected to the plurality of detection air intake pipes 61, so that the plurality of fixed connecting holes 711 are respectively connected to the plurality of detection air intake pipes 61; the movable connecting block 72 is slidably connected to the frame 1, and the movable connecting block 72 is also abutted against the side surface of the fixed connecting block 71 away from the detection air intake pipe 61, and the movable connecting block 72 is also provided with a movable connecting hole 721. At the same time, when the movable connecting block 72 moves back and forth along the length direction of the fixed connecting block 71, the movable connecting hole 721 will be separately connected to different fixed connecting holes 711.

[0050] Reference Figure 1 and Figure 2 The connecting hose 73 is made of a bellows material, one end of which is connected to the air outlet of the second air pump 5, and the other end is connected to the surface of the mobile connecting block 72 away from the fixed connecting block 71, and the connecting hose 73 is also connected to the mobile connecting hole 721, so that the second air pump 5 can be connected to any one of the detection air inlet pipes 61 separately; the switching drive member 74 includes an abutment block 741 and a telescopic cylinder 742, and the abutment block 741 is provided with two, and the two abutment blocks 741 are respectively connected to the mobile connecting block 72 along their own The two ends of the movement direction are abutted against each other; the telescopic cylinder 742 is fixedly installed on the frame 1, and there are two telescopic cylinders 742, the piston rods of the two telescopic cylinders 742 are respectively connected to the two abutment blocks 741, and the telescopic direction of the piston rod of the telescopic cylinder 742 is parallel to the length direction of the fixed connecting block 71, so that the reciprocating linear motion of the mobile connecting block 72 can be realized under the cooperation of the two telescopic cylinders 742 and the two abutment blocks 741, thereby achieving the purpose of switching the second air pump 5 to be connected to different detection air boxes 6.

[0051] Reference Figure 1 and Figure 2 The locking cam 743 is configured to lock the locking cam 742 in place and secure the locking cam 744 with the engagement of the support member 74 with the engagement member 742. The locking cam 743 is configured to lock the locking cam 742 in place and secure the locking cam 744 with the engagement member 742.

[0052] Reference Figure 1 and Figure 2Secondly, a first sealing rack 712 is connected to the fixed communicating block 71, wherein the first sealing rack 712 is located on the side surface of the fixed communicating block 71 close to the movable communicating block 72, and the first sealing rack 712 is distributed on the outside of the fixed communicating hole 711, and the tooth thickness direction of the first sealing rack 712 is parallel to the movement direction of the movable communicating block 72; a second sealing rack 722 is connected to the side surface of the movable communicating block 72 close to the fixed communicating block 71, wherein the second sealing rack 722 is located on the outside of the movable communicating hole 721, and the second sealing rack 722 is also meshed with the first sealing rack 712, so the abutment gap between the movable communicating block 72 and the fixed communicating block 71 will be bent, thereby further improving the airtightness between the movable communicating block 72 and the fixed communicating block 71.

[0053] Reference Figure 1 and Figure 2 , when the power of the second air pump 5 remains unchanged and the gas flow rate flowing into the detection air box 6 needs to be changed, in this embodiment, the detection air inlet pipe 61 is in the form of a multi-section telescopic tube structure, wherein the section with the largest inner diameter of the detection air inlet pipe 61 is fixedly connected to the fixed connecting block 71, and the section with the smallest inner diameter is fixedly connected to the detection air box 6. At the same time, a movable slide 11 and a movable driving member 12 are slidably connected to the frame 1, wherein the movement direction of the movable slide 11 is parallel to the axial direction of the detection air inlet pipe 61, and the movable slide 11 is also connected to the detection air box 6; the structure of the movable driving member 12 can be a screw slide, or a cylinder can be selected to drive the movable slide 11 to move, so in the process of the movable slide 11 approaching or moving away from the fixed connecting block 71, the detection air inlet pipe 61 will stretch or shorten to change the overall flux of the detection air inlet pipe 61, thereby being able to change the gas flow rate flowing into the detection air box 6.

[0054] Reference Figure 1 and Figure 3In this embodiment, since the gas concentration in the buffer gas box 3 needs to reach a predetermined value before the second air pump 5 is started, in order to shorten the starting interval between the second air pump 5 and the first air pump 2, the following settings are correspondingly made: first, a partition block 31, a fixed tube 32 and an elastic telescopic tube 33 are provided in the buffer gas box 3. Specifically, the partition block 31 is slidably provided in the chamber of the buffer gas box 3, and the movement direction of the partition block 31 is perpendicular to one side outer surface of the buffer gas box 3; the fixed tube 32 is in the shape of a circular tube, and the fixed tube 32 has a One end is fixedly connected to the inner wall of the buffer air box 3 opposite to the partition block 31, and the other end extends to the position close to the partition block 31. At the same time, the fixed tube 32 is also connected to the air outlet of the first air pump 2 and the air inlet of the second air pump 5; the elastic telescopic tube 33 is in the form of a bellows structure, and one end of the elastic telescopic tube 33 is coaxially fixedly connected to the fixed tube 32, and the elastic telescopic tube 33 is communicated with the fixed tube 32, and the other end is fixedly connected to the partition block 31, so that a variable air storage cavity 8 that can change the volume will be formed in the buffer air box 3.

[0055] Reference Figure 1 and Figure 3 Secondly, one end of the exhaust balancing pipe 4 is passed through the partition block 31, and the exhaust balancing pipe 4 is also connected to the variable air storage chamber 8, and the other end of the exhaust balancing pipe 4 passes through the outside of the buffer air box 3, and the part of the exhaust balancing pipe 4 located in the buffer air box 3 is also provided with a balancing spring 42, wherein one end of the balancing spring 42 is fixedly connected to the inner wall of the buffer air box 3, and the other end is fixedly connected to the partition block 31. When the first air pump 2 is started, the second air pump 5 is not started, and the exhaust balancing pipe 4 is closed, during the process of gas flowing into the variable air storage chamber 8, the partition block 31 will move away from the fixed pipe 32, so that the volume of the variable air storage chamber 8 gradually increases, but the gas concentration in the variable air storage chamber 8 will be maintained within the predetermined range, so that the gas can reach the predetermined concentration in the buffer air box 3 more quickly, thereby shortening the time period for the gas to complete the detection.

[0056] Reference Figure 1 and Figure 2In this embodiment, an auxiliary pipe 9 is connected between the detection air inlet pipe 61 and the fixed connecting block 71. One end of the auxiliary pipe 9 is connected to the section with the largest inner diameter of the detection air inlet pipe 61, and the other end is connected to the fixed connecting hole 711. At the same time, the auxiliary pipe 9 is also equipped with a one-way valve 91, and the one-way valve 91 can only allow the gas moving from the fixed connecting hole 711 to the detection air inlet pipe 61 to pass through; the air outlet of the first air pump 2 is connected to the two-way valve 21, the working air pipe 22 and the pre-preparation air pipe 23. Specifically, the input end of the two-way valve 21 is connected to the air outlet of the first air pump 2; one end of the working air pipe 22 is connected to one of the output ends of the two-way valve 21, and the other end is connected to the fixed pipe 32; one end of the pre-preparation air pipe 23 is connected to the other output end of the two-way valve 21, and the other end is forked into multiple bundles and is connected to multiple auxiliary pipes 9.

[0057] Reference Figure 1 and Figure 3 Before conducting gas detection, the first air pump 2 is first connected to the working air pipe 22 and the pre-preparation air pipe 23 through the two-way valve 21. Then, a part of the gas enters the variable air storage chamber 8 along the working air pipe 22, so that the gas concentration in the variable air storage chamber 8 reaches the predetermined value at which the second air pump 5 can be started. The other part of the gas enters the auxiliary pipe 9 along the pre-preparation air pipe 23, and then flows into the detection air box 6 along the detection air inlet pipe 61. Then, the impurities in the detection air box 6 can be discharged, so that the idle time can be more reasonably utilized to clean the detection air box 6, and the detection accuracy of the subsequent detection air box 6 can be improved.

[0058] The implementation principle of a dual-pump gas detector in an embodiment of the present application is: when the detection gas is to be allowed to enter different detection gas boxes 6 respectively, the piston rod of one of the telescopic cylinders 742 is extended, and the piston rod of the other telescopic cylinder 742 is retracted, so that the movable connecting block 72 can perform reciprocating linear motion. After the movable connecting hole 721 on the movable connecting block 72 is connected with the corresponding fixed connecting hole 711, the air outlet of the second air pump 5 can be connected with the corresponding detection air inlet pipe 61, so that different detection gases can enter different detection gas boxes 6, and then the gas detector can detect different gases.

[0059] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A dual-air pump gas detector, characterized in that: include: Rack (1); a first air pump (2), wherein an air inlet of the first air pump (2) is used for communicating with an external air source; a buffer air box (3), the buffer air box (3) being in communication with the air outlet of the first air pump (2); An exhaust balance pipe (4), one end of which is in communication with the buffer gas box (3), and a throttle valve (41) is connected to the exhaust balance pipe (4); a second air pump (5), wherein an air inlet of the second air pump (5) is connected to the buffer air box (3); A plurality of detection air boxes (6) are provided, each of the detection air boxes (6) being connected to a detection air inlet pipe (61) and a detection air outlet pipe (62); a communication switching assembly (7) for connecting the air outlet of the second air pump (5) to one of the detection air inlet pipes (61); The connectivity switching component (7) comprises: A fixed communication block (71) is provided on the frame (1), the fixed communication block (71) being provided with a plurality of fixed communication holes (711), the plurality of fixed communication holes (711) being respectively connected to the plurality of detection air intake pipes (61); A movable communication block (72) is slidably arranged on the frame (1), the movable communication block (72) abuts against a surface of a side of the fixed communication block (71) away from the detection air intake pipe (61), and the movable communication block (72) is provided with a movable communication hole (721) connected to the fixed communication hole (711); A connecting hose (73), one end of which is connected to the air outlet of the second air pump (5), and the other end of which is connected to the movable communication block (72), and the connecting hose (73) is connected to the movable communication hole (721); a switching drive member (74) connected to the movable communication block (72); The detection air inlet pipe (61) is in the form of a multi-section telescopic pipe structure, the section with the largest inner diameter of the detection air inlet pipe (61) is connected to the fixed connecting block (71), and the section with the smallest inner diameter is connected to the detection air box (6); the frame (1) is provided with a movable slide (11), the movable slide (11) is fixedly connected to the detection air box (6), and the movement direction of the movable slide (11) is parallel to the axial direction of the detection air inlet pipe (61); the frame (1) is provided with a movable driving member (12), and the movable driving member (12) is connected to the movable slide (11); A partition block (31) is slidingly provided in the buffer air box (3), and the partition block (31) is sealed and connected to the inner wall of the buffer air box (3) to form a variable air storage cavity (8), and the variable air storage cavity (8) is connected to the air outlet of the first air pump (2) and the air inlet of the second air pump (5); one end of the exhaust balance pipe (4) is passed through the partition block (31) to be connected to the variable air storage cavity (8), and the other end passes through the buffer air box (3); the portion of the exhaust balance pipe (4) located in the buffer air box (3) is sleeved with a balance spring (42), one end of the balance spring (42) is connected to the partition block (31), and the other end is connected to the inner wall of the buffer air box (3); The partition block (31) is connected to a fixed tube (32) and an elastic telescopic tube (33); one end of the fixed tube (32) is fixedly connected to the inner wall of the buffer air box (3); the fixed tube (32) is communicated with the air outlet of the first air pump (2) and the air inlet of the second air pump (5); one end of the elastic telescopic tube (33) is connected to the other end of the fixed tube (32); the other end of the elastic telescopic tube (33) is connected to the partition block (31) to form the variable air storage chamber (8); An auxiliary pipe (9) is connected between the detection air inlet pipe (61) and the fixed connecting block (71), and the auxiliary pipe (9) is respectively connected to the detection air inlet pipe (61) and the fixed connecting hole (711), and the auxiliary pipe (9) is provided with a one-way valve (91); the first air pump (2) is connected to a two-way valve (21), a working air pipe (22) and a pre-preparation air pipe (23), and the input end of the two-way valve (21) is connected to the air outlet of the first air pump (2); one end of the working air pipe (22) is connected to one of the output ends of the two-way valve (21), and the other end is connected to the detection air box (6); one end of the pre-preparation air pipe (23) is connected to the other output end of the two-way valve (21), and the other end is connected to the auxiliary pipe (9).

2. The dual-air pump gas detector according to claim 1, characterized in that: The switching drive member (74) comprises: An abutment block (741) is slidably arranged on the frame (1), and two abutment blocks (741) are provided. The two abutment blocks (741) respectively abut against two ends of the movable communication block (72) along its own movement direction; A telescopic cylinder (742) is provided on the frame (1). Two telescopic cylinders (742) are provided, and piston rods of the two telescopic cylinders (742) are respectively connected to the two abutment blocks (741).

3. The dual-air pump gas detector according to claim 2, characterized in that: The surface where the abutting block (741) abuts against the movable communication block (72) is set as a limiting sealing surface (743), and the limiting sealing surface (743) is arranged in an inclined manner, and the limiting sealing surface (743) faces the position where the fixed communication block (71) is located.

4. The dual-air pump gas detector according to claim 1, characterized in that: The fixed connecting block (71) is connected to a first sealing rack (712), the first sealing rack (712) is located outside the fixed connecting hole (711), and the tooth thickness direction of the first sealing rack (712) is parallel to the movement direction of the movable connecting block (72); the movable connecting block (72) is connected to a second sealing rack (722), the second sealing rack (722) is located outside the movable connecting hole (721), and the second sealing rack (722) is meshed with the first sealing rack (712).

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