Pneumatic gas sampling pump

Abstract

The invention relates to the technical field of gas sampling pumps, and particularly discloses a pneumatic gas sampling pump which comprises a gas sampling pump body, a filter assembly, a pressure compensator and a base, the gas sampling pump body is fixedly connected to the upper portion of the base, the pressure compensator is arranged above the gas sampling pump body, and the filter assembly is located on one side of the gas sampling pump body; the gas sampling pump comprises a pump body, and two groups of valve plate chambers, cavity flange gaskets, cavities and diaphragms which are symmetrically arranged, wherein the cavities are fixedly connected to the pump body. The pump can be driven through airflow, a power source is not needed, the electrical safety problem is avoided, the pump can adapt to the harsh working environment and can be used in places without power supply, electric energy conversion loss is avoided when gas driving is used, more energy is saved, the environment in the pump can be prevented from being polluted through the arrangement of the filtering assembly, and the service life of the pump is prolonged. And the sampling work can be smoothly carried out.

Description

Technical Field

[0001] The invention relates to the technical field of gas sampling pumps, and in particular 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. It is widely used in environmental monitoring, industrial emission detection, laboratory analysis and other fields. Its main function is to extract gas samples from the measurement point and transport them to analytical instruments or detection equipment in order to analyze the composition and concentration of the gas.

[0003] At present, the existing technology still has the following areas for improvement: the gas sampling pumps currently on the market are mainly electrically driven, which have safety hazards such as electrical short circuits and leakage, generally require relatively stable power support, have poor adaptability to the environment, and are easily affected by harsh environments such as high temperature, low temperature or extreme humidity. When sampling gas, particles in the air or the sampled gas are likely to remain in the pump, causing environmental pollution in the pump and affecting subsequent sampling work. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a pneumatic gas sampling pump, which can realize that the pump is driven by airflow, does not require power supply, avoids electrical safety problems, can adapt to relatively harsh working environments, can be used in places without power supply, and has no power conversion loss when driven by gas, which is more energy-saving. Moreover, through the setting of the filtering component, the environment inside the pump can be prevented from being polluted, thereby ensuring the smooth progress of the sampling work.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A pneumatic gas sampling pump, comprising 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 at 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 pressure compensator comprises an upper flange, a lower flange, a bellows and a connecting rod, and the bellows is fixedly connected between the upper flange and the lower flange.

[0006] Preferably, the dust removal pipe is arranged in 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.

[0007] Preferably, the filter is provided with an installation assembly, a installation frame, a filter screen, a guide block and a mounting platform inside, the mounting platform is fixedly connected to the lower middle 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, and the two guide blocks are located on the side connected to the dust removal pipe.

[0008] Preferably, the mounting components are provided in multiple groups, and the multiple groups of mounting components are respectively arranged on both sides of the mounting platform, and the mounting components include 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, and the mounting frame is fixedly connected to the L-shaped vertical section of the bracket, and the L-shaped horizontal section of the bracket is fixedly connected to the top of the limit block.

[0009] Preferably, the limiting block is arranged in a circular ring shape, the limiting cap is arranged in a trapezoidal shape, the size of the limiting cap matches the diameter of the inner circle of the limiting block, and the limiting cap is located on the inner side of the limiting block.

[0010] Preferably, a channel horizontally passing through the limit block is opened in the middle and lower part of the limit block, and a plurality of bolts are provided, and the plurality of bolts respectively pass through the channels on both sides of the limit block, and a spring is sleeved on the bolt, and the adjacent side sections of the bolt and 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.

[0011] Preferably, 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 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.

[0012] Preferably, the sliding block is slidably connected to the connecting shaft, the sliding block 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.

[0013] Preferably, 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.

[0014] Preferably, the upper flange and the lower flange are both provided with a plurality of support blocks, the positions of the plurality of support blocks of the upper flange correspond one-to-one with the positions of the plurality of support blocks of the lower flange, through holes are opened on the support blocks, and a plurality of connecting rods are provided, 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.

[0015] The beneficial effects of the present invention are: (1) By setting up a gas sampling pump and a base, the technical effect that can be achieved is that the gas sampling pump is driven by airflow to take samples, does not require power supply, avoids electrical safety issues, can adapt to more stringent working environments, can be used in places without power supply, has no power conversion loss when driven by gas, is more energy-efficient, and has a relatively simple structure, does not require a complex electrical system, has a low failure rate, has low maintenance costs, and reduces production costs.

[0016] (2) By setting up the filter assembly, the technical effect that can be achieved is that the filter can be detachably connected to the installation frame, and the installation frame can be detachably connected to the installation table, which is convenient for disassembly, cleaning, and maintenance. A sealing ring is arranged between the installation frame and the installation table. The filter is airtight in the sampling state, and the gas flowing downward can be filtered by the filter, which can avoid the pollution of the environment inside the pump and ensure the smooth progress of the sampling work. The two guide blocks are located on the side connected to the dust removal pipe to assist in guiding the direction of the air flow and facilitate the dust removal work. The reflux pipe connects the filter and the outlet pipe. A reflux valve is arranged on the reflux pipe to facilitate the control of gas reflux.

[0017] (3) By setting up the filter assembly, a technical effect can also be achieved that a spring is provided on the bolt to facilitate horizontal displacement of the bolt so that the limit block can reach a locking state through the bolt and the limit cap, and it is also convenient for the limit block to be disassembled. The adjacent side sections of the bolt and the limit cap match the limit cap, which is convenient for the limit block to drive the bolt to slide up and down through the limit cap to install and disassemble the limit block. The transition plate cooperates with the support spring to support and position the limit block, ensure the stability of the limit block and the limit cap when they are in the locking state, and ensure the stability of the bracket and the mounting frame after being installed on the mounting table. The sliding block is wide in the middle and narrow at both ends, which is convenient for sliding with the bolt.

[0018] (4) By setting up a pressure compensator, the technical effect that can be achieved is that the flow of the gas sampling pump can be easily controlled and adjusted through the cooperation between the pressure compensator and the pressure sensor to maintain the preset flow when the external pressure changes. When the pressure fluctuates, the pressure compensator can avoid excessive work of the gas sampling pump and reduce unnecessary energy consumption, thereby improving the efficiency of the overall system. The pressure compensator can adjust the output pressure of the gas sampling pump to avoid overpressure of the gas sampling pump, which helps to extend the service life of the gas sampling pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a front view of the present invention; Figure 2 A perspective view of the present invention; Figure 3 It is a left side view of the present invention; Figure 4 is a structural diagram of the filter assembly in the present invention; Figure 5 A top view of the filter assembly of the present invention; Figure 6 is a cross-sectional view of the filter assembly of the present invention; Figure 7 is a cross-sectional view of the installation assembly in the present invention; Figure 8 It is a schematic diagram of the installation assembly of the present invention when being disassembled; Fig. 9 is a structural diagram of the pressure compensator in the present invention; Fig.10 An exploded view of the gas sampling pump of the present invention; Description of main component symbols: 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. mounting 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, mounting frame; 203, filter screen; 204, guide block; 205, mounting table; 3, pressure compensator; 301, upper flange; 302, lower flange; 303, bellows; 304, connecting rod; 4, base; 5, sample tube; 6, sample pump; 7, air inlet pipe; 8, air inlet pump; 9, dust removal pipe; 10, dust removal pump; 11, reflux pipe; 12, reflux valve; 13, outlet pipe; 14, exhaust pump. DETAILED DESCRIPTION

[0021] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are clearly and completely described below in combination with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present application, it should be understood that the orientation or position relationship indicated by "inside" or "outside" is based on the orientation or position described in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, specific orientation structure and operation, and therefore cannot be understood as a limitation on the present application.

[0023] Reference Figures 1 to 10 The present invention discloses a pneumatic gas sampling pump, comprising a gas sampling pump 1, a filter assembly, a pressure compensator 3 and a base 4, wherein the gas sampling pump 1 is fixedly connected to the top of the base 4, the pressure compensator 3 is arranged above the gas sampling pump 1, and the filter assembly is located at one side of the gas sampling pump 1; The gas sampling pump 1 comprises a pump body 106 and two groups of valve chambers 102, a cavity flange gasket 103, a cavity 104 and a diaphragm 105 which are symmetrically arranged. The cavity 104 is fixedly connected to the pump body 106. Two one-way valves are arranged in the cavity 104. The diaphragm 105 is located inside the cavity 104. A connecting rod is connected between the two groups 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 groups of valve chambers 102 are connected through a first ventilation pipe 101 and a second ventilation pipe 107. The gas sampling pump 1 is driven by airflow for sampling, does not require power supply, avoids electrical safety issues, can adapt to harsh working environments, can be used in places without power supply, has no power conversion loss when driven by gas, is more energy-efficient, and has a relatively simple structure, does not require a complex electrical system, has a low failure rate, low maintenance cost, and reduced production cost. The filter 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 reflux pipe 11, a reflux valve 12, an air outlet pipe 13 and an exhaust pump 14. The sample tube 5 is arranged above the filter 2, and the sample tube 5 is provided with a sample pump 6. The air inlet pipe 7 is connected with the filter 2 and the first ventilation pipe 101, and the air inlet pipe 7 is provided with an air inlet pump 8. The reflux pipe 11 is connected with the filter 2 and the air outlet pipe 13, and the reflux valve 12 is provided on the reflux pipe 11 to facilitate the control of gas reflux; the dust removal pipe 9 is arranged in the middle of one side of the filter 2, and the dust removal pump 10 is arranged on the dust removal pipe 9. The air outlet pipe 13 is arranged at the top of the second ventilation pipe 107, and the air outlet pipe 13 is provided with an exhaust pump 14; The pressure compensator 3 includes an upper flange 301, a lower flange 302, a bellows 303 and a connecting rod 304. The bellows 303 is fixedly connected between the upper flange 301 and the lower flange 302. A pressure sensor is arranged in the gas sampling pump 1. The pressure compensator 3 cooperates with the pressure sensor to facilitate the control and adjustment of the flow of the gas sampling pump 1 so as to maintain the preset flow when the external pressure changes. When the pressure fluctuates, the pressure compensator 3 can avoid excessive operation of the gas sampling pump 1 and reduce 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 avoid overpressure of the gas sampling pump 1, which helps to extend the service life of the gas sampling pump 1.

[0024] Reference Figures 4 to 9 The filter 2 is provided with an installation component 201, an installation frame 202, a filter screen 203, a guide block 204 and a mounting platform 205. The mounting platform 205 is fixedly connected to the lower middle part of the filter 2. Two guide blocks 204 are provided. The two guide blocks 204 are arranged in a trapezoidal shape. The two guide blocks 204 are arranged symmetrically. The two guide blocks 204 are located on the side connected to the dust removal pipe 9 to assist in guiding the direction of the airflow and facilitate the dust removal work.

[0025] Through the cooperation of the outlet pipe 13, the return pipe 11 and the filter 2, the gas can be diverted and utilized. The gas diverted from the outlet pipe 13 enters the filter 2 and flows upward, backblowing away the impurities accumulated on the filter 203, and recovering it in cooperation with the dust removal pipe 9, which can avoid excessive impurities accumulating on the filter 203 and affecting the gas filtering effect.

[0026] Reference Figures 4 to 9 , multiple groups of mounting components 201 are provided, and the multiple groups of mounting components 201 are respectively arranged on both sides of the mounting platform 205. The mounting components 201 include 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 arranged in an L shape, and the mounting frame 202 is fixedly connected to the L-shaped vertical section of the bracket 2011, and the L-shaped horizontal section of the bracket 2011 is fixedly connected to the top of the limit block 2012.

[0027] Reference Figures 4 to 9 The limit block 2012 is set in a circular ring shape, the limit cap 2013 is set in a trapezoidal shape, 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 on the inner side of the limit block 2012; a channel that horizontally penetrates the limit block 2012 is opened in the middle and lower part of the limit block 2012, and a plurality of bolts 2015 are provided, and the plurality of bolts 2015 respectively penetrate the channels on both sides of the limit block 2012, and a spring 214 is sleeved on the bolt 2015 to facilitate the screw The bolt 2015 is horizontally displaced so that the limit block 2012 reaches a snap-fit ​​state through the bolt 2015 and the limit cap 2013, which is also convenient for the disassembly of the limit block 2012. The adjacent side sections of the bolt 2015 and the limit cap 2013 are arranged in an inclined manner, and the adjacent side sections of the bolt 2015 and the limit cap 2013 match the limit cap 2013, which is convenient for the limit block 2012 to drive the bolt 2015 to slide up and down through the limit cap 2013 to install and disassemble the limit block 2012.

[0028] Reference Figures 4 to 9 The base block 2019 is fixedly connected to the mounting platform 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. Through the cooperation between the transition plate 2021 and the support spring 2020, the limit block 2012 can be supported and positioned, ensuring the stability of the limit block 2012 and the limit cap 2013 when they are in a snap-fit ​​state, and ensuring the stability of the bracket 2011 and the mounting frame 202 after being installed on the mounting platform 205. A through hole is set in the middle of the transition plate 2021, and the connecting shaft 2016 passes through the through hole of the transition plate 2021.

[0029] Reference Figures 4 to 9 The sliding block 2017 is slidably connected to the connecting shaft 2016. The sliding block 2017 is wide in the middle and narrow at both ends, which is convenient for sliding with the bolt 2015. The size of the sliding block 2017 matches the diameter of the inner circle of the limit 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 platform 205, which is convenient for disassembly and cleaning, and maintenance. A sealing ring is arranged between the mounting frame 202 and the mounting platform 205. The airtightness of the filter 2 in the sampling state, the gas flowing downward 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.

[0030] Reference Figures 1 to 3 and Fig. 9 Multiple support blocks are arranged on the upper flange 301 and the lower flange 302. The positions of the support blocks of the multiple upper flanges 301 correspond to the positions of the support blocks of the multiple lower flanges 302. Through holes are opened on the support blocks. Multiple connecting rods 304 are arranged. Each connecting rod 304 passes through the through holes of the support blocks of the upper flange 301 and the lower flange 302 and is fixedly connected to the upper flange 301 and the lower flange 302.

[0031] The working principle and use process of the present invention are as follows: the gas sampling pump 1 is started, and compressed air enters the gas sampling pump 1 from the pressure compensator 3 to drive the diaphragm 105 in the two cavities 104 connected by the driving connecting rod to reciprocate synchronously. The reciprocating motion of the diaphragm 105 causes the volume of the cavity 104 to change, so that the two one-way valves in the cavity 104 are alternately opened and closed, thereby continuously inhaling and discharging the gas. The pressure compensator 3 maintains the sampling flow rate of the gas sampling pump 1 at the preset flow rate.

[0032] Turn on the sample pump 6, the gas enters the filter 2 from the sample tube 5, and flows downward through the filter 203, turn on the air intake pump 8, the gas flows from the air intake pipe 7 to the valve plate chamber 102, the gas flows to the valve plate chamber 102 on the other side through the first ventilation pipe 101 and flows to the outlet pipe 13 through the second ventilation pipe 107, turn on the exhaust pump 14, the gas flows out from the outlet pipe 13 to complete the sampling.

[0033] When dust removal is required inside the filter 2, the reflux valve 12 is opened to divert the gas, and the gas flows back into the filter 2. At the same time, the dust removal pump 10 is turned on to blow away the impurities accumulated on the filter 203 with the help of the reflux gas, and the dust is recovered and removed through the dust removal pipe 9.

[0034] When the filter 203 needs to be replaced, the bracket 2011 is pressed, and the bracket 2011 drives the limit block 2012 to be pressed down, and the limit block 2012 drives the transition plate 2021 and the support spring 2020 to be pressed down. When the limit block 2012 is pressed down to the position where the bolt 2015 is located below the sliding block 2017, the bracket 2011 is lifted 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 passing through the sliding block 2017 and the limit cap 2013, the bolt 2015 is moved in a horizontal direction separated to both sides by the spring 2014, so that the limit block 2012, the bracket 2011 and the mounting frame 202 can be completely lifted and disassembled, and the filter 203 can be replaced.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution 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 content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A pneumatic gas sampling pump, characterized in that: The gas sampling pump (1) comprises a gas sampling pump (1), a filter assembly, a pressure compensator (3) and a base (4), wherein the gas sampling pump (1) is fixedly connected to the top of the base (4), the pressure compensator (3) is arranged above the gas sampling pump (1), and the filter assembly is located on one side of the gas sampling pump (1); The gas sampling pump (1) comprises a pump body (106) and two groups of symmetrically arranged valve chambers (102), a cavity flange gasket (103), a cavity (104) and a diaphragm (105); the cavity (104) is fixedly connected to the pump body (106); the diaphragm (105) is located inside the cavity (104); the cavity flange gasket (103) is fixedly connected to the cavity (104); the valve chamber (102) is fixedly connected to the cavity (104); and the two groups of valve chambers (102) are connected via a first ventilation pipe (101) and a second ventilation pipe (107); The filter assembly comprises 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 reflux pipe (11), a reflux valve (12), an air outlet pipe (13) and an exhaust pump (14), wherein the sample tube (5) is arranged above the filter (2), the sample tube (5) is provided with a sample pump (6), the air inlet pipe (7) is connected to the filter (2) and the first ventilation pipe (101), the air inlet pipe (7) is provided with an air inlet pump (8), the reflux pipe (11) is connected to the filter (2) and the air outlet pipe (13), and the reflux pipe (11) is provided with a reflux valve (12); The pressure compensator (3) comprises an upper flange (301), a lower flange (302), a bellows (303) and a connecting rod (304); the bellows (303) is fixedly connected between the upper flange (301) and the lower flange (302).

2. A pneumatic gas sampling pump according to claim 1, characterized in that: The dust removal pipe (9) is arranged at the middle of one side of the filter (2), a dust removal pump (10) is arranged on the dust removal pipe (9), the air outlet pipe (13) is arranged at the top of the second ventilation pipe (107), and an exhaust pump (14) is arranged on the air outlet pipe (13).

3. A pneumatic gas sampling pump according to claim 2, characterized in that: The filter (2) is provided with a mounting assembly (201), a mounting frame (202), a filter screen (203), a guide block (204) and a mounting platform (205) inside; the mounting platform (205) is fixedly connected to the middle and lower part of the filter (2); two guide blocks (204) are provided; the two guide blocks (204) are arranged in a trapezoidal shape; the two guide blocks (204) are arranged symmetrically; and the two guide blocks (204) are located on a side connected to the dust removal pipe (9).

4. A pneumatic gas sampling pump according to claim 3, characterized in that: The mounting assembly (201) is provided with multiple groups, and the multiple groups of mounting assembly (201) are respectively arranged on both sides of the mounting platform (205); the mounting assembly (201) comprises 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 arranged in an L shape, the mounting frame (202) is fixedly connected to the L-shaped vertical section of the bracket (2011), and the L-shaped horizontal section of the bracket (2011) is fixedly connected to the top of the limit block (2012).

5. A pneumatic gas sampling pump according to claim 4, characterized in that: The limiting block (2012) is arranged in a circular ring shape, the limiting cap (2013) is arranged in a trapezoidal shape, the size of the limiting cap (2013) matches the diameter of the inner circle of the limiting block (2012), and the limiting cap (2013) is located on the inner side of the limiting block (2012).

6. A pneumatic gas sampling pump according to claim 5, characterized in that: A channel is provided in the middle and lower part of the limit block (2012) and passes through the limit block (2012) horizontally. A plurality of bolts (2015) are provided, and the plurality of bolts (2015) pass through the channels on both sides of the limit block (2012) respectively. A spring (2014) is sleeved on the bolt (2015). The adjacent side sections of the bolt (2015) and the limit cap (2013) are arranged in an inclined manner, and the adjacent side sections of the bolt (2015) and the limit cap (2013) match the limit cap (2013).

7. A pneumatic gas sampling pump according to claim 4, characterized in that: The base block (2019) is fixedly connected to the mounting platform (205), the support rod (2018) is fixedly connected to the base block (2019), the connecting shaft (2016) is fixedly connected to the support rod (2018), the support spring (2020) is sleeved on the support rod (2018), the support spring (2020) is fixedly connected between the transition plate (2021) and the base block (2019), 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).

8. A pneumatic gas sampling pump according to claim 7, characterized in that: The sliding block (2017) is slidably connected to the connecting shaft (2016); the sliding block (2017) is wide in the middle and narrow at both ends; the size of the sliding block (2017) matches the diameter of the inner circle of the limiting block (2012).

9. A pneumatic gas sampling pump according to claim 4, characterized in that: The filter screen (203) is detachably connected to the installation frame (202), the installation frame (202) is detachably connected to the installation platform (205), and a sealing ring is provided between the installation frame (202) and the installation platform (205).

10. A pneumatic gas sampling pump according to claim 1, characterized in that: A plurality of support blocks are arranged on the upper flange (301) and the lower flange (302), and the positions of the support blocks of the upper flange (301) and the support blocks of the lower flange (302) correspond one to one. Through holes are provided on the support blocks, and a plurality of connecting rods (304) are arranged. Each of the connecting rods (304) penetrates through the through holes of the support blocks of the upper flange (301) and the through holes of the support blocks of the lower flange (302) and is fixedly connected to the upper flange (301) and the lower flange (302).

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