A pneumatic gas sampling pump

Abstract

The present invention relates to the technical field of gas sampling pumps, and specifically discloses a pneumatic gas sampling pump, which includes a gas sampling pump, a filtering component, a pressure compensator and a base. The gas sampling pump is fixedly connected above the base, the pressure compensator is arranged above the gas sampling pump, and the filtering component is located on one side of the gas sampling pump. The gas sampling pump includes a pump body and two groups of valve plate chambers, cavity flange gaskets, cavities and diaphragms symmetrically arranged, and the cavity is fixedly connected to the pump body. The present invention can realize that the pump is driven by air flow without a power supply, avoiding electrical safety problems, being able to adapt to relatively harsh working environments, being able to be used in places without power supply, having no power conversion loss when using gas drive, being more energy-saving, and through the setting of the filtering component, being able to avoid the pollution of the internal environment of the pump and ensuring the smooth progress of the sampling work.

Description

Technical Field

[0001] The present invention relates to the technical field of gas sampling pumps, and particularly relates to a pneumatic gas sampling pump. Background Art

[0002] A gas sampling pump is a device used to collect gas samples from a gas environment, and is widely used in fields such as environmental monitoring, industrial emission detection, and laboratory analysis. Its main function is to extract and transport gas samples from the measurement point to an analytical instrument or detection device for analyzing the composition, concentration, etc. of the gas.

[0003] Currently, the existing technologies still have the following areas to be improved: The gas sampling pumps on the market mainly use electric drive, which has potential safety hazards such as electrical short circuits and leakage. Generally, they require a relatively stable power supply and have poor adaptability to the environment, being easily affected in harsh environments such as high temperature, low temperature, or extreme humidity. When sampling gas, particulate matter brought in from the air or the sampling gas is likely to remain in the pump, causing environmental pollution inside the pump and affecting subsequent sampling work. Summary of the Invention

[0004] To solve the above problems existing in the prior art, the present invention provides a pneumatic gas sampling pump, which can achieve the pump being driven by air flow, without the need for a power supply, avoiding electrical safety problems, being able to adapt to relatively harsh working environments, and can be used in places without power supply. When using gas drive, there is no loss of electrical energy conversion, which is more energy-efficient. Moreover, through the setting of the filtering component, it can avoid the pollution of the internal environment of the pump and ensure the smooth progress of the sampling work.

[0005] The object of the present invention can be achieved through the following technical solutions:

[0006] A pneumatic gas sampling pump, comprising a gas sampling pump, a filtering component, a pressure compensator, and a base. The gas sampling pump is fixedly connected above the base, the pressure compensator is arranged above the gas sampling pump, and the filtering component is located on one side of the gas sampling pump;

[0007] The gas sampling pump includes a pump body, two groups of valve chambers arranged symmetrically, a cavity flange gasket, a cavity, and a diaphragm. The cavity is fixedly connected to the pump body, the diaphragm is located inside the cavity, the cavity flange gasket is fixedly connected to the cavity, the valve chambers are fixedly connected to the cavity, and the two groups of valve chambers are communicated through a first air pipe and a second air pipe;

[0008] The filtering component includes a filter, a sample tube, a sample pump, an intake pipe, an intake pump, a dust removal pipe, a dust removal pump, a return pipe, a return valve, an outlet pipe, and an exhaust pump. The sample tube is arranged above the filter, and a sample pump is arranged on the sample tube. The intake pipe communicates with the filter and the first ventilation pipe, and an intake pump is arranged on the intake pipe. The return pipe communicates with the filter and the outlet pipe, and a return valve is arranged on the return pipe.

[0009] The pressure compensator includes an upper flange, a lower flange, a corrugated pipe, and a connecting rod. The corrugated pipe is fixedly connected between the upper flange and the lower flange.

[0010] Preferably, the dust removal pipe is arranged in the middle of one side of the filter, and a dust removal pump is arranged on the dust removal pipe. The outlet pipe is arranged at the top of the second ventilation pipe, and an exhaust pump is arranged on the outlet pipe.

[0011] Preferably, an installation component, an installation frame, a filter screen, a guiding block, and an installation table are arranged inside the filter. The installation table is fixedly connected to the middle and lower part of the filter. There are two guiding blocks, and the two guiding blocks are trapezoid-shaped and symmetrically arranged. The two guiding blocks are located on the side connected to the dust removal pipe.

[0012] Preferably, there are multiple groups of installation components, and the multiple groups of installation components are respectively arranged on both sides of the installation table. The installation component includes a bracket, a limiting block, a limiting cap, a bolt, a connecting shaft, a sliding block, a support rod, a base block, a support spring, and a transition plate. The bracket is L-shaped, the installation frame is fixedly connected to the vertical section of the L-shape of the bracket, and the horizontal section of the L-shape of the bracket is fixedly connected to the top of the limiting block.

[0013] Preferably, the limiting block is circular-ring-shaped, the limiting cap is trapezoid-like, the size of the limiting cap matches the diameter of the inner circle of the limiting block, and the limiting cap is located inside the limiting block.

[0014] Preferably, a horizontally penetrating channel is provided in the middle and lower part of the limiting block, and there are multiple bolts. The multiple bolts respectively penetrate the channels on both sides of the limiting block. Springs are sleeved on the bolts. The adjacent side section of the bolt and the limiting cap is inclined and matches the limiting cap.

[0015] Preferably, the base block is fixedly connected to the mounting table, the support rod is fixedly connected to the base block, the connecting shaft is fixedly connected to the support rod, the support spring is sleeved on the support rod, the support spring is fixedly connected between the transition plate and the base block, a through hole is provided in the middle of the transition plate, and the connecting shaft passes through the through hole of the transition plate.

[0016] Preferably, the sliding block is slidably connected to the connecting shaft, the sliding block is arranged in a form that is wide in the middle and narrow at both ends, and the size of the sliding block matches the diameter of the inner circle of the limiting block.

[0017] Preferably, the filter screen is detachably connected to the mounting frame, the mounting frame is detachably connected to the mounting table, and a sealing ring is arranged between the mounting frame and the mounting table.

[0018] Preferably, a plurality of support blocks are arranged on both the upper flange and the lower flange, the positions of the support blocks of the plurality of upper flanges correspond to those of the support blocks of the plurality of lower flanges one by one, through holes are provided in the support blocks, a plurality of connecting rods are provided, and each connecting rod passes through the through holes of the support blocks of the upper flange and the through holes of the support blocks of the lower flange and is fixedly connected to the upper flange and the lower flange.

[0019] The beneficial effects of the present invention are as follows:

[0020] (1) By providing a gas sampling pump and a base, the technical effects that can be achieved are that the gas sampling pump samples through air flow, without the need for power supply, avoiding electrical safety problems, being able to adapt to relatively harsh working environments, and can be used in places without power supply. When using gas drive, there is no loss of electrical energy conversion, it is more energy-saving, and the structure is relatively simple, without the need for a complex electrical system, with a low failure rate and low maintenance costs, reducing production costs.

[0021] (2) By providing a filtering component, the technical effects that can be achieved are that the filter screen is detachably connected to the mounting frame, the mounting frame is detachably connected to the mounting table, which is convenient for disassembly and cleaning and for maintenance. A sealing ring is arranged between the mounting frame and the mounting table to ensure the airtightness of the filter during the sampling state. All the downward-flowing gases can be filtered by the filter screen, which can avoid the pollution of the pump internal environment and ensure the smooth progress of the sampling work. The two guiding blocks are located on the side connected to the dust removal pipe to assist in guiding the air flow direction and facilitate the dust removal work. The return pipe connects the filter and the air outlet pipe, and a return valve is arranged on the return pipe to facilitate controlling the gas to flow back.

[0022] (3) By setting up a filtering component, the achievable technical effects are as follows: a spring is sleeved on the bolt, which facilitates the horizontal displacement of the bolt so that the limiting block reaches the buckling state with the limiting cap through the bolt, and also facilitates the disassembly of the limiting block. The adjacent side segments of the bolt and the limiting cap match the limiting cap, which facilitates the limiting block to drive the bolt to slide up and down through the limiting cap for the installation and disassembly of the limiting block. Through the cooperation of the transition plate and the support spring, the limiting block can be supported and positioned, ensuring the stability when the limiting block and the limiting cap are in the buckling state, and ensuring the stability after the bracket and the installation frame are installed on the installation table. The sliding block is arranged in a form that is wide in the middle and narrow at both ends, which facilitates sliding in cooperation with the bolt.

[0023] (4) By setting up a pressure compensator, the achievable technical effects are as follows: through the cooperation of the pressure compensator and the pressure sensor, it is convenient to control and adjust the flow rate of the gas sampling pump to maintain it at a preset flow rate when the external pressure changes. When the pressure fluctuates, the pressure compensator can prevent the gas sampling pump from overworking, reducing unnecessary energy consumption, thereby improving the efficiency of the overall system. The pressure compensator adjusts the output pressure of the gas sampling pump to prevent the gas sampling pump from overpressuring, which helps to extend the service life of the gas sampling pump. Brief Description of the Drawings

[0024] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 It is the front view of the present invention;

[0026] Figure 2 It is the perspective view of the present invention;

[0027] Figure 3 It is the left view of the present invention;

[0028] Figure 4 It is the structural diagram of the filtering component in the present invention;

[0029] Figure 5 It is the top view of the filtering component in the present invention;

[0030] Figure 6 It is the cross-sectional view of the filtering component in the present invention;

[0031] Figure 7 It is the cross-sectional view of the installation component in the present invention;

[0032] Figure 8 It is the schematic diagram when the installation component in the present invention is disassembled;

[0033] Figure 9 It is the structural diagram of the pressure compensator in the present invention;

[0034] Figure 10Explosion diagram of the gas sampling pump in the present invention;

[0035] Description of main component symbols:

[0036] In the figure: 1. Gas sampling pump; 101. First ventilation pipe; 102. Valve plate chamber; 103. Cavity flange gasket; 104. Cavity; 105. Diaphragm; 106. Pump body; 107. Second ventilation pipe; 2. Filter; 201. Installation assembly; 2011. Bracket; 2012. Limit block; 2013. Limit cap; 2014. Spring; 2015. Bolt; 2016. Connecting shaft; 2017. Sliding block; 2018. Support rod; 2019. Base block; 2020. Support spring; 2021. Transition plate; 202. Installation frame; 203. Filter screen; 204. Guide block; 205. Installation table; 3. Pressure compensator; 301. Upper flange; 302. Lower flange; 303. Bellows; 304. Connecting rod; 4. Base; 5. Sample tube; 6. Sample pump; 7. Intake pipe; 8. Intake pump; 9. Dust removal pipe; 10. Dust removal pump; 11. Return pipe; 12. Return valve; 13. Outlet pipe; 14. Exhaust pump. Specific embodiments

[0037] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following describes in clear and complete detail the specific embodiments, structures, features, and their effects of the present invention in combination with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "inside" and "outside" is based on the orientation or position shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, specific orientation structure, and operation. Therefore, it should not be construed as a limitation to the present application.

[0039] Refer to Figures 1 to 10 , a pneumatic gas sampling pump disclosed by the present invention includes a gas sampling pump 1, a filtering assembly, a pressure compensator 3, and a base 4. The gas sampling pump 1 is fixedly connected above the base 4, the pressure compensator 3 is arranged above the gas sampling pump 1, and the filtering assembly is located on one side of the gas sampling pump 1;

[0040] The gas sampling pump 1 includes a pump body 106 and two sets of valve chambers 102, a cavity flange gasket 103, a cavity 104, and a diaphragm 105 that are symmetrically arranged. The cavity 104 is fixedly connected to the pump body 106. Two one-way valves are provided in the cavity 104. The diaphragm 105 is located inside the cavity 104. A connecting rod is connected between the two sets of diaphragms 105. The cavity flange gasket 103 is fixedly connected to the cavity 104. The valve chamber 102 is fixedly connected to the cavity 104. The two sets of valve chambers 102 are connected and communicated through a first air pipe 101 and a second air pipe 107. The gas sampling pump 1 samples by air flow driving, without the need for a power source, avoiding electrical safety problems, being able to adapt to relatively harsh working environments, and can be used in places without power supply. When using gas drive, there is no electric energy conversion loss, being more energy-efficient, and having a relatively simple structure, not requiring a complex electrical system, with a low failure rate and lower maintenance costs, reducing production costs;

[0041] The filtering assembly includes a filter 2, a sample tube 5, a sample pump 6, an air inlet pipe 7, an air inlet pump 8, a dust removal pipe 9, a dust removal pump 10, a return pipe 11, a return valve 12, an air outlet pipe 13, and an exhaust pump 14. The sample tube 5 is arranged above the filter 2. A sample pump 6 is provided on the sample tube 5. The air inlet pipe 7 connects the filter 2 and the first air pipe 101. An air inlet pump 8 is provided on the air inlet pipe 7. The return pipe 11 connects the filter 2 and the air outlet pipe 13. A return valve 12 is provided on the return pipe 11 to facilitate controlling the gas to return; The dust removal pipe 9 is arranged in the middle on one side of the filter 2. A dust removal pump 10 is provided on the dust removal pipe 9. The air outlet pipe 13 is arranged at the top of the second air pipe 107. An exhaust pump 14 is provided on the air outlet pipe 13;

[0042] The pressure compensator 3 includes an upper flange 301, a lower flange 302, a corrugated pipe 303, and a connecting rod 304. The corrugated pipe 303 is fixedly connected between the upper flange 301 and the lower flange 302. A pressure sensor is arranged inside the gas sampling pump 1. Through the cooperation of the pressure compensator 3 and the pressure sensor, it is convenient to control and adjust the flow rate of the gas sampling pump 1 to maintain a preset flow rate when the external pressure changes. When the pressure fluctuates, the pressure compensator 3 can prevent the gas sampling pump 1 from overworking, reducing unnecessary energy consumption, thereby improving the efficiency of the overall system. The pressure compensator 3 adjusts the output pressure of the gas sampling pump 1 to prevent the gas sampling pump 1 from overpressure, which helps to extend the service life of the gas sampling pump 1.

[0043] Refer to Figures 4 to 9, inside the filter 2, there are an installation component 201, an installation frame 202, a filter screen 203, a guiding block 204 and an installation platform 205. The installation platform 205 is fixedly connected to the middle and lower part of the filter 2. There are two guiding blocks 204, which are trapezoid-shaped, symmetrically arranged, and located on the side connected to the dust removal pipe 9 to assist in guiding the air flow direction and facilitate the dust removal work.

[0044] Through the cooperation of the air outlet pipe 13, the return pipe 11 and the filter 2, the gas can be shunted and utilized. The gas shunted from the air outlet pipe 13 enters the filter 2 and flows upward, blowing away the impurities accumulated on the filter screen 203 by backwashing, and cooperating with the dust removal pipe 9 for recovery, which can prevent excessive impurities from accumulating on the filter screen 203 and affecting the gas filtration effect.

[0045] Refer to Figures 4 to 9 , there are multiple groups of installation components 201, which are respectively arranged on both sides of the installation platform 205. The installation component 201 includes a bracket 2011, a limit block 2012, a limit cap 2013, a bolt 2015, a connecting shaft 2016, a sliding block 2017, a support rod 2018, a base block 2019, a support spring 2020 and a transition plate 2021. The bracket 2011 is L-shaped, the installation frame 202 is fixedly connected to the vertical section of the L-shape of the bracket 2011, and the horizontal section of the L-shape of the bracket 2011 is fixedly connected to the top of the limit block 2012.

[0046] Refer to Figures 4 to 9 , the limit block 2012 is circular-ring-shaped, the limit cap 2013 is trapezoid-like, the size of the limit cap 2013 matches the diameter of the inner circle of the limit block 2012, and the limit cap 2013 is located inside the limit block 2012; a horizontally penetrating channel of the limit block 2012 is opened in the middle and lower part of the limit block 2012. There are multiple bolts 2015, which respectively penetrate the channels on both sides of the limit block 2012. A spring 2014 is sleeved on the bolt 2015, which facilitates the horizontal displacement of the bolt 2015 so that the limit block 2012 reaches a buckling state with the limit cap 2013 through the bolt 2015, and also facilitates the disassembly of the limit block 2012. The adjacent side section of the bolt 2015 and the limit cap 2013 is inclined, and the adjacent side section of the bolt 2015 and the limit cap 2013 matches the limit cap 2013, which facilitates the limit block 2012 to drive the bolt 2015 to slide up and down through the limit cap 2013 for the installation and disassembly of the limit block 2012.

[0047] Refer to Figures 4 to 9, the base block 2019 is fixedly connected to the mounting table 205, the support rod 2018 is fixedly connected to the base block 2019, and the connecting shaft 2016 is fixedly connected to the support rod 2018; the support spring 2020 is sleeved on the support rod 2018, and the support spring 2020 is fixedly connected between the transition plate 2021 and the base block 2019. By cooperating the transition plate 2021 with the support spring 2020, the limiting block 2012 can be supported and positioned, ensuring the stability when the limiting block 2012 and the limiting cap 2013 are in the buckling state, and ensuring the stability after the bracket 2011 and the mounting frame 202 are mounted on the mounting table 205. A through hole is provided in the middle of the transition plate 2021, and the connecting shaft 2016 passes through the through hole of the transition plate 2021.

[0048] Refer to Figures 4 to 9 , the sliding block 2017 is slidably connected to the connecting shaft 2016. The sliding block 2017 is arranged in a form that is wide in the middle and narrow at both ends, facilitating sliding in cooperation with the bolt 2015. The size of the sliding block 2017 matches the diameter of the inner circle of the limiting block 2012; the filter screen 203 is detachably connected to the mounting frame 202, and the mounting frame 202 is detachably connected to the mounting table 205, which is convenient for disassembly and cleaning and for maintenance. A sealing ring is provided between the mounting frame 202 and the mounting table 205 to ensure the airtightness of the filter 2 in the sampling state. All the downward-flowing gases can be filtered by the filter screen 203, which can avoid the pollution of the environment inside the pump and ensure the smooth progress of the sampling work.

[0049] Refer to Figures 1 to 3 and Figure 9 A plurality of support blocks are provided on both the upper flange 301 and the lower flange 302. The positions of the support blocks of the plurality of upper flanges 301 correspond to those of the support blocks of the plurality of lower flanges 302 one by one. Through holes are provided in the support blocks, and a plurality of connecting rods 304 are provided. Each connecting rod 304 passes through the through hole of the support block of the upper flange 301 and is fixedly connected to the upper flange 301 and the lower flange 302 by passing through the through hole of the support block of the lower flange 302.

[0050] The working principle and usage process of the present invention: Start the gas sampling pump 1, and compressed air enters the inside of the gas sampling pump 1 from the pressure compensator 3 for driving. The diaphragms 105 in the two cavities 104 connected by the driving link reciprocate synchronously. The reciprocating movement of the diaphragms 105 causes a change in the volume inside the cavities 104, enabling the two one-way valves inside the cavities 104 to open and close alternately, thereby continuously sucking and discharging gases. The pressure compensator 3 maintains the sampling flow rate of the gas sampling pump 1 at a preset flow rate.

[0051] Turn on the sample pump 6. The gas enters the filter 2 from the sample tube 5 and flows downward through the filter screen 203. Turn on the intake pump 8. The gas flows from the intake pipe 7 to the valve plate chamber 102, passes through the first ventilation pipe 101 to the valve plate chamber 102 on the other side, and passes through the second ventilation pipe 107 to the outlet pipe 13. Turn on the exhaust pump 14. The gas flows out from the outlet pipe 13 to complete the sampling.

[0052] When it is necessary to remove dust inside the filter 2, turn on the reflux valve 12 to divert the gas. The gas refluxes into the filter 2. At the same time, turn on the dust removal pump 10 to blow away the impurities accumulated on the filter screen 203 in cooperation with the refluxing gas, and recover and remove dust through the dust removal pipe 9.

[0053] When the filter screen 203 needs to be replaced, press the bracket 2011. The bracket 2011 drives the limit block 2012 to press down. The limit block 2012 drives the transition plate 2021 and the support spring 2020 to press down. After the limit block 2012 presses down until the bolt 2015 is located below the sliding block 2017, lift the bracket 2011 upward. At this time, the support spring 2020 drives the transition plate 2021 to reset, and the bolt 2015 drives the sliding block 2017 to slide upward to the limit cap 2013. The limit block 2012 continues to slide upward to drive the bolt 2015 to slide upward. When the bolt 2015 passes through the sliding block 2017 and the limit cap 2013, it moves horizontally in the direction of separating to both sides through the spring 2014, so that the limit block 2012, the bracket 2011 and the mounting frame 202 can be completely lifted and disassembled to replace the filter screen 203.

[0054] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content without departing from the technical solution scope of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still belong to the scope of the technical solution of the present invention.

Claims

1. A pneumatic gas sampling pump, characterized in that: It includes a gas sampling pump, a filter assembly, a pressure compensator and a base, wherein the gas sampling pump is fixedly connected to the top of the base, the pressure compensator is arranged above the gas sampling pump, and the filter assembly is located on one side of the gas sampling pump; The gas sampling pump comprises a pump body and two groups of valve chambers, a cavity flange gasket, a cavity and a diaphragm which are symmetrically arranged. The cavity is fixedly connected to the pump body, the diaphragm is located inside the cavity, the cavity flange gasket is fixedly connected to the cavity, the valve chamber is fixedly connected to the cavity, and the two groups of valve chambers are connected through a first ventilation pipe and a second ventilation pipe. The filter assembly includes a filter, a sample tube, a sample pump, an air inlet pipe, an air inlet pump, a dust removal pipe, a dust removal pump, a reflux pipe, a reflux valve, an air outlet pipe and an exhaust pump. The sample tube is arranged above the filter, the sample tube is provided with a sample pump, the air inlet pipe is connected with the filter and the first ventilation pipe, the air inlet pipe is provided with an air inlet pump, the reflux pipe is connected with the filter and the air outlet pipe, and the reflux pipe is provided with a reflux valve; The dust removal pipe is arranged at the middle of one side of the filter, a dust removal pump is arranged on the dust removal pipe, the air outlet pipe is arranged at the top of the second ventilation pipe, and an exhaust pump is arranged on the air outlet pipe; The filter is provided with a mounting frame, a filter screen, a guide block and a mounting platform inside, the mounting platform is fixedly connected to the middle and lower part of the filter, two guide blocks are provided, the two guide blocks are arranged in a trapezoidal shape, the two guide blocks are arranged symmetrically, the two guide blocks are located on the side of the filter connected to the dust removal pipe, the filter screen is detachably connected to the mounting frame, the mounting frame is detachably connected to the mounting platform, and a sealing ring is provided between the mounting frame and the mounting platform; The pressure compensator includes an upper flange, a lower flange, a bellows and a connecting rod. The bellows is fixedly connected between the upper flange and the lower flange. A pressure sensor is provided in the gas sampling pump. The cooperation between the pressure compensator and the pressure sensor facilitates the control and adjustment of the flow of the gas sampling pump.

2. A pneumatic gas sampling pump according to claim 1, characterized in that: The filter is provided with a mounting assembly inside, and the mounting assembly is provided with multiple groups, and the multiple groups of mounting assemblies are respectively arranged on both sides of the mounting platform, and the mounting assembly includes a bracket, a limit block, a limit cap, a bolt, a connecting shaft, a sliding block, a support rod, a base block, a support spring and a transition plate, the bracket is arranged in an L shape, the mounting frame is fixedly connected to the L-shaped vertical section of the bracket, the L-shaped horizontal section of the bracket is fixedly connected to the top of the limit block, the limit block is arranged in a circular ring shape, the limit cap is arranged in a trapezoidal shape, the size of the limit cap matches the diameter of the inner circle of the limit block, and the limit cap is located on the inner side of the limit block; A channel is provided in the middle and lower part of the limit block, which passes through the limit block horizontally. A plurality of bolts are provided, and the plurality of bolts respectively pass through the channels on both sides of the limit block. A spring is sleeved on the bolt. The bolt and the adjacent side sections of the limit cap are arranged in an inclined manner, and the adjacent side sections of the bolt and the limit cap match the limit cap. The base block is fixedly connected to the mounting platform, the support rod is fixedly connected to the base block, the connecting shaft is fixedly connected to the support rod, the supporting spring is sleeved on the supporting rod, the supporting spring is fixedly connected between the transition plate and the base block, a through hole is provided in the middle of the transition plate, and the connecting shaft passes through the through hole of the transition plate; The sliding block is slidably connected to the connecting shaft. The sliding block is arranged to be wide in the middle and narrow at both ends. The size of the sliding block matches the diameter of the inner circle of the limiting block.

3. A pneumatic gas sampling pump according to claim 1, characterized in that: A plurality of support blocks are arranged on the upper flange and the lower flange, and the positions of the support blocks of the upper flange correspond to the positions of the support blocks of the lower flange one by one. Through holes are opened on the support blocks, and a plurality of connecting rods are arranged, and each of the connecting rods passes through the through holes of the upper flange support block and the through holes of the lower flange support block and is fixedly connected to the upper flange and the lower flange.

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