Waste gas treatment mechanism with automatic cleaning function

Abstract

The invention relates to a waste gas treatment mechanism with an automatic cleaning function, and belongs to the technical field of waste gas treatment.The waste gas treatment mechanism comprises a spraying tower and waste gas treatment equipment, the waste gas treatment equipment comprises a water tank, a booster pump and a gas collecting hood arranged outside the spraying tower, and a filtering structure can be arranged in a gas conveying pipe; a reciprocating cleaning mechanism for cleaning the filter plate is arranged in the gas conveying pipe; the reciprocating cleaning mechanism further comprises a linkage structure installed between the other output shaft of the double-shaft motor and the reciprocating rod, and a dust falling structure used in cooperation with the reciprocating cleaning mechanism is arranged in the air conveying pipe. According to the waste gas treatment mechanism with the automatic cleaning function, the filter plate and the reciprocating cleaning mechanism are arranged in the gas conveying pipe and are used in cooperation with the double-shaft motor and dust falling equipment, the efficiency and performance of a dust collection system can be remarkably improved, the dust collection effect is optimized, the air quality is improved, and therefore efficient cleaning and dust collection performance optimization are achieved; and the stability and durability of the system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and in particular to a waste gas treatment mechanism with an automatic cleaning function. Background Art

[0002] Waste gas refers to the toxic and harmful gases discharged by humans in the process of production and life. In particular, chemical plants, steel plants, pharmaceutical plants, coking plants and oil refineries emit strong odors of waste gas, which seriously pollutes the environment and affects human health, so it is necessary to install equipment to treat waste gas.

[0003] The Chinese invention patent announcement number is CN117122997B, which discloses "a chemical waste gas treatment device, a treatment device body, and a filter mechanism fixedly connected to the left side of the treatment device body. When the patent is used, the activated carbon filter plate can be used to perform preliminary filtration before the waste gas is treated, and the granular objects and harmful substances in the waste gas can be treated. Not only can the activated carbon filter plate be quickly installed and disassembled, but also the granular objects attached to the activated carbon filter plate can be cleaned.

[0004] The above patent has the following defects: in order to clean the filter plate, a device for cleaning the filter plate is installed in the gas pipeline, but the dust reduction function is indeed used in conjunction with the cleaning device. When the cleaning device cleans the filter plate, dust particles may float freely in the dust collection pipeline, causing the filter to be quickly blocked, which will greatly reduce the dust collection efficiency. In addition, the lack of dust reduction function will affect the operation of the entire filtration system.

[0005] Therefore, it is urgent to improve the exhaust gas treatment mechanism to solve the above problems. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides an exhaust gas treatment mechanism with automatic cleaning function, which has the advantages of efficient cleaning, optimized dust collection performance, improved system stability and durability, and solves the problem of secondary dust that is easily caused when removing dust from the filter plate.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an exhaust gas treatment mechanism with automatic cleaning function, comprising a spray tower and an exhaust gas treatment device, the exhaust gas treatment device comprising a water tank and a booster pump and an air collecting hood arranged outside the spray tower, and an air delivery pipe and a connecting pipe are arranged between the air collecting hood and the spray tower, a first fan and a double-shaft motor are installed in the connecting pipe, and the first fan is connected and fixed to one of the output shafts of the double-shaft motor, a first nozzle is installed around the outer surface of the spray tower, and a filtering structure can be arranged in the air delivery pipe;

[0008] The filtering structure comprises a filter net bag fixedly installed inside the gas collecting hood and a filter plate detachably installed inside the gas transmission pipe, wherein a plurality of filter meshes are arranged inside the filter net bag;

[0009] A reciprocating cleaning mechanism for cleaning the filter plate is arranged in the gas delivery pipe, and the reciprocating cleaning mechanism comprises two limit plates fixedly mounted inside the gas delivery pipe, a reciprocating rod slidably penetrated through the two limit plates, a connecting plate fixedly mounted on one end of the reciprocating rod, a connecting rod threadedly mounted inside the connecting plate, and a knocking block fixedly mounted on one end of the connecting rod away from the connecting plate, and a return spring is fixedly mounted between the connecting plate and the limit plate close to the knocking block;

[0010] The reciprocating cleaning mechanism also includes a linkage structure installed between the other output shaft of the dual-axis motor and the reciprocating rod, the linkage structure is composed of a mounting sleeve fixedly installed on the outer surface of the reciprocating rod, a cross bar welded to the outer wall of the mounting sleeve, a cam rotatably installed on the other end of the cross bar, a spline shaft fixedly installed on the other output shaft of the dual-axis motor, and a rotating drum fixedly installed on the other end of the spline shaft, a reciprocating slide groove adapted to the cam is opened in the rotating drum, and the cam extends into the reciprocating slide groove and is rollingly connected with its inner wall;

[0011] The air pipe is provided with a dust reduction structure used in conjunction with the reciprocating cleaning mechanism. The dust reduction structure includes a second nozzle installed around the outer surface of the air pipe, and a second connecting pipe is fixedly connected between the second nozzle and the first nozzle.

[0012] Furthermore, a support structure is provided below the spray tower, and the support structure includes a frame and a workbench welded to the upper surface of the frame.

[0013] Furthermore, the spray tower, water tank and booster pump are all bolted to the upper surface of the workbench, the output end and input end of the booster pump are fixedly connected with a first connecting pipe, and the two first connecting pipes are fixedly connected with the water tank and the first spray pipe respectively.

[0014] Furthermore, the connecting pipe is fixedly connected to the adjacent end of the gas pipe, and the connecting pipe is fixedly connected to the spray tower and the gas collecting hood at the end away from the gas pipe. The connecting pipe and the gas pipe are both hollow inside, and the gas collecting hood is conical in shape.

[0015] Furthermore, the filter net bag is adapted to the air collecting hood and is elastic, and a second exhaust fan is installed on the top side of the spray tower.

[0016] Furthermore, a connecting frame fixed to the inner wall of the communicating pipe is welded to the outside of the dual-axis motor, and a stabilizing frame supporting the first fan is welded to the communicating pipe.

[0017] Furthermore, the two limit plates are provided with through holes inside, and the reciprocating rod penetrates through the two limit plates through the through holes and performs reciprocating motion in cooperation with the sliding cooperation of the cam and the reciprocating slide groove.

[0018] Furthermore, the reset spring surrounds the outer surface of the reciprocating rod, the interior of the mounting sleeve is hollow and sleeved on the outer surface of the reciprocating rod, and a locking bolt connected to the reciprocating rod is installed in the mounting sleeve.

[0019] Furthermore, a buffer pad is installed at one end of the knocking block away from the connecting rod, and the reciprocating slide groove is a cam groove, and the reciprocating slide groove is inclined and arranged around the outer surface of the rotating drum.

[0020] Furthermore, through holes are provided in the spray tower and the gas pipe, and the nozzles on the first nozzle and the second nozzle extend into the spray tower and the gas pipe through the through holes. A maintenance cover and a drain pipe are detachably installed at the bottom of the gas pipe.

[0021] Compared with the prior art, the present invention provides an exhaust gas treatment mechanism with an automatic cleaning function, which has the following beneficial effects:

[0022] 1. The exhaust gas treatment mechanism with automatic cleaning function can significantly improve the efficiency and performance of the dust collection system, optimize the dust collection effect, and improve the air quality by arranging a filter plate and a reciprocating cleaning mechanism in the air pipe and using it in conjunction with a dual-axis motor and dust reduction equipment, thereby achieving the advantages of efficient cleaning, optimizing dust collection performance, and improving system stability and durability, and solving the problem of secondary dust that is easily caused when removing dust from the filter plate.

[0023] 2. When the exhaust gas treatment mechanism with automatic cleaning function is used, the exhaust gas enters the gas transmission pipe through the gas collecting hood, and the gas containing impurities enters from the gas collecting hood. The airflow blows the filter net bag, and the filter net bag is stretched at this time, so that the filter mesh of the filter net bag becomes smaller, and the steel slag particles in the gas are left on the filter net bag, and the gas is filtered in cooperation with the filter plate, so that the gas filtering effect is better;

[0024] In addition, the filter net bag is elastic and can shake off impurities on it after stopping, and the filter net bag is located on the air collection hood, which is convenient for the staff to clean it in time.

[0025] 3. The exhaust gas treatment mechanism with automatic cleaning function utilizes the installation of a dual-axis motor to drive the first fan and the drum respectively, which not only improves the efficiency and effect of exhaust gas treatment, but also reduces the driving source, increases the linkage effect between structures, improves work efficiency, and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural stereogram of an exhaust gas treatment mechanism with an automatic cleaning function according to the present invention;

[0027] Figure 2 This is a structural cross-sectional view of a spray tower of an exhaust gas treatment mechanism with an automatic cleaning function according to the present invention;

[0028] Figure 3 This is a structural cross-sectional view of an air delivery pipe of an exhaust gas treatment mechanism with an automatic cleaning function according to the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of a waste gas treatment mechanism connecting pipes with an automatic cleaning function according to the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the other side of the connecting pipe of an exhaust gas treatment mechanism with automatic cleaning function according to the present invention;

[0031] Figure 6 This is a structural stereogram of a reciprocating cleaning mechanism of an exhaust gas treatment mechanism with an automatic cleaning function according to the present invention.

[0032] In the figure: 1. frame; 2. workbench; 3. spray tower; 4. air collecting hood; 5. air supply pipe; 6. connecting pipe; 61. stabilizing frame; 7. first fan; 8. double-axis motor; 9. second fan; 10. filter plate; 11. filter net bag; 12. filter mesh; 13. reciprocating cleaning mechanism; 14. limit plate; 15. reciprocating rod; 16. connecting plate; 17. connecting rod; 18. knocking block; 1801; buffer pad; 19. reset spring; 20. mounting sleeve; 21. cross bar; 22. cam; 23. spline shaft; 24. rotating drum; 25. reciprocating slide; 26. water tank; 27. booster pump; 28. first nozzle; 29. ​​second nozzle; 30. first connecting pipe; 31. second connecting pipe. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0034] See also Figures 1 to 6, an exhaust gas treatment mechanism with automatic cleaning function, including a spray tower 3 and an exhaust gas treatment device, the exhaust gas treatment device including a water tank 26 and a booster pump 27 and an air collecting hood 4 arranged outside the spray tower 3, and an air delivery pipe 5 and a connecting pipe 6 are arranged between the air collecting hood 4 and the spray tower 3, a first fan 7 and a double-shaft motor 8 are installed in the connecting pipe 6, and the first fan 7 is fixedly connected to one of the output shafts of the double-shaft motor 8, a first nozzle 28 is installed around the outer surface of the spray tower 3, the output end and the input end of the booster pump 27 are fixedly connected with a first connecting pipe 30, and the two first connecting pipes 30 are fixedly connected with the water tank 26 and the first nozzle 28 respectively. A heating device can also be installed in the water tank 26 to adapt to colder areas.

[0035] Specifically, the connecting pipe 6 is fixedly connected to the adjacent end of the gas pipe 5, and the connecting pipe 6 is fixedly connected to the spray tower 3 and the gas collecting hood 4 at the end away from the gas pipe 5. The connecting pipe 6 and the gas pipe 5 are both hollow inside, and the gas collecting hood 4 is conical in shape. A filtering structure may be provided inside the gas pipe 5; the filtering structure includes a filter net bag 11 fixedly installed inside the gas collecting hood 4 and a filter plate 10 detachably installed inside the gas pipe 5, and a plurality of filter meshes 12 are provided inside the filter net bag 11.

[0036] It should be noted that the filter net bag 11 is compatible with the gas collecting hood 4, and the filter net bag 11 is elastic, and the top side of the spray tower 3 is equipped with a second exhaust fan 9. When in use, the exhaust gas enters the gas pipe 5 through the gas collecting hood 4, and the gas containing impurities enters from the gas collecting hood 4. The airflow blows the filter net bag 11, and the filter net bag 11 is stretched, so that the filter mesh 12 of the filter net bag 11 becomes smaller, and the steel slag particles in the gas remain on the filter net bag 11, and the gas is filtered in cooperation with the filter plate 10, so that the gas filtering effect is better.

[0037] In addition, the filter net bag 11 is elastic and can shake off impurities thereon after stopping, and the filter net bag 11 is located on the air collecting hood 4, which is convenient for the staff to clean it in time.

[0038] The outside of the dual-axis motor 8 is welded with a connecting frame fixed to the inner wall of the connecting pipe 6, and the connecting pipe 6 is welded with a stabilizing frame 61 for supporting the first fan 7, so as to improve the stability of the first fan 7 when working.

[0039] In this embodiment, a support structure is provided below the spray tower 3, and the support structure includes a frame 1 and a workbench 2 welded to the upper surface of the frame 1. The spray tower 3, the water tank 26 and the booster pump 27 are all bolted to the upper surface of the workbench 2.

[0040] In order to improve the efficiency of waste gas treatment, in this embodiment, a dust reduction structure is provided in the air pipe 5 for use with the reciprocating cleaning mechanism 13. The dust reduction structure includes a second nozzle 29 installed around the outer surface of the air pipe 5, and a second connecting pipe 31 is fixedly connected between the second nozzle 29 and the first nozzle 28. A reciprocating cleaning mechanism 13 for cleaning the filter plate 10 is provided in the air supply pipe 5. The reciprocating cleaning mechanism 13 includes two limit plates 14 fixedly mounted inside the air supply pipe 5, a reciprocating rod 15 slidably penetrated through the two limit plates 14, a connecting plate 16 fixedly mounted at one end of the reciprocating rod 15, a connecting rod 17 threadedly mounted inside the connecting plate 16, and a knocking block 18 fixedly mounted at one end of the connecting rod 17 away from the connecting plate 16. A return spring 19 is fixedly mounted between the connecting plate 16 and the limit plate 14 on the side close to the knocking block 18. When the drum 24 rotates, the reciprocating rod 15 reciprocates through the sliding cooperation of the cam 22 and the reciprocating slide 25, thereby intermittently knocking the filter plate 10 to effectively prevent the filter plate 10 from being blocked and maintain its dust removal efficiency. The water sprayed by the second nozzle 29 can moisten the dust particles in the air, making it easier to be captured by the filter plate and cleaned up, avoiding secondary dusting, thereby improving the dust removal effect.

[0041] The reciprocating cleaning mechanism 13 further includes a linkage structure installed between the other output shaft of the dual-axis motor 8 and the reciprocating rod 15, the linkage structure is composed of a mounting sleeve 20 fixedly mounted on the outer surface of the reciprocating rod 15, a cross bar 21 welded to the outer wall of the mounting sleeve 20, a cam 22 rotatably mounted on the other end of the cross bar 21, a spline shaft 23 fixedly mounted on the other output shaft of the dual-axis motor 8, and a rotating drum 24 fixedly mounted on the other end of the spline shaft 23, a reciprocating slide groove 25 adapted to the cam 22 is provided in the rotating drum 24, and the cam 22 extends into the reciprocating slide groove 25 and is rollingly connected to its inner wall;

[0042] Specifically, the two limit plates 14 are provided with through holes inside, and the reciprocating rod 15 penetrates through the two limit plates 14 through the through holes and performs reciprocating motion in cooperation with the cam 22 and the reciprocating slide 25. The reset spring 19 surrounds the outer surface of the reciprocating rod 15, and the mounting sleeve 20 is hollow inside and sleeved on the outer surface of the reciprocating rod 15. The mounting sleeve 20 is provided with a locking bolt connected to the reciprocating rod 15. The reset spring 19 can perform buffering and reset, so that the reciprocating plate 15 can perform reciprocating motion better.

[0043] In order to protect the filter plate 10 , a buffer pad 1801 is installed at one end of the knocking block 18 away from the connecting rod 17 . The reciprocating slide groove 25 is a cam groove. The reciprocating slide groove 25 is inclined and arranged around the outer surface of the rotating drum 24 .

[0044] In this embodiment, through holes are opened in the spray tower 3 and the gas pipe 5, and the nozzles on the first nozzle 28 and the second nozzle 29 extend into the spray tower 3 and the gas pipe 5 through the through holes. A maintenance cover and a drain pipe are detachably installed at the bottom of the gas pipe 5.

[0045] The working principle of the above embodiment is:

[0046] When in use, the dual-axis motor 8 is started to drive the first fan 7 and the rotating drum 24 to rotate respectively. The first fan 7 works to form a negative pressure in the gas pipe 5 to perform air suction work. The exhaust gas enters the gas pipe 5 through the gas collecting hood 4. The gas containing impurities enters from the gas collecting hood 4. The airflow blows the filter net bag 11. At this time, the filter net bag 11 is elongated, so that the filter mesh of the filter net bag 11 becomes smaller, and the steel slag particles in the gas remain on the filter net bag 11, and the gas is filtered in cooperation with the filter plate 10, so that the gas filtering effect is better.

[0047] When the drum 24 rotates, the reciprocating rod 15 reciprocates through the sliding cooperation between the cam 22 and the reciprocating slide groove 25, thereby intermittently knocking the filter plate 10 to effectively prevent the filter plate 10 from being blocked and maintain its dust removal efficiency. The water sprayed by the second nozzle 29 can moisten the dust particles in the air, making it easier for them to be captured by the filter plate and cleaned up, avoiding secondary dusting, thereby improving the dust removal effect.

[0048] The installation method, connection method or setting method disclosed in this embodiment are all common mechanical connection methods, and they can be implemented as long as they can achieve their beneficial effects. In addition, the electrical components appearing in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Technicians in this field can control the electrical components through simple programming, and the existing disclosed power connection technology is also common knowledge in this field, so the specific structural composition and working principle will not be described in detail in this embodiment.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste gas treatment mechanism with automatic cleaning function, comprising a spray tower (3) and waste gas treatment equipment, characterized in that: The waste gas treatment equipment comprises a water tank (26) and a booster pump (27) and an air collecting hood (4) arranged outside the spray tower (3), and an air delivery pipe (5) and a connecting pipe (6) are arranged between the air collecting hood (4) and the spray tower (3), a first fan (7) and a double-shaft motor (8) are installed in the connecting pipe (6), and the first fan (7) is fixedly connected to one of the output shafts of the double-shaft motor (8), a first nozzle (28) is installed around the outer surface of the spray tower (3), and a filtering structure can be arranged in the air delivery pipe (5); The filtering structure comprises a filtering net bag (11) fixedly mounted inside the gas collecting hood (4) and a filtering plate (10) detachably mounted inside the gas transmission pipe (5), wherein a plurality of filtering meshes (12) are arranged inside the filtering net bag (11); A reciprocating cleaning mechanism (13) for cleaning the filter plate (10) is arranged in the air delivery pipe (5), and the reciprocating cleaning mechanism (13) comprises two limit plates (14) fixedly mounted inside the air delivery pipe (5), a reciprocating rod (15) slidably penetrated through the two limit plates (14), a connecting plate (16) fixedly mounted on one end of the reciprocating rod (15), a connecting rod (17) threadedly mounted inside the connecting plate (16), and a knocking block (18) fixedly mounted on the end of the connecting rod (17) away from the connecting plate (16), and a return spring (19) fixedly mounted between the connecting plate (16) and the limit plate (14) on the side close to the knocking block (18); The reciprocating cleaning mechanism (13) further comprises a linkage structure installed between the other output shaft of the dual-axis motor (8) and the reciprocating rod (15), the linkage structure comprising a mounting sleeve (20) fixedly mounted on the outer surface of the reciprocating rod (15), a cross bar (21) welded to the outer wall of the mounting sleeve (20), a cam (22) rotatably mounted on the other end of the cross bar (21), a spline shaft (23) fixedly mounted on the other output shaft of the dual-axis motor (8), and a rotating cylinder (24) fixedly mounted on the other end of the spline shaft (23), wherein a reciprocating slide groove (25) adapted to the cam (22) is provided in the rotating cylinder (24), and the cam (22) extends into the reciprocating slide groove (25) and is rollingly connected to the inner wall thereof; The air supply pipe (5) is provided with a dust reduction structure used in conjunction with the reciprocating cleaning mechanism (13), the dust reduction structure comprising a second nozzle (29) installed around the outer surface of the air supply pipe (5), and a second connecting pipe (31) is fixedly connected between the second nozzle (29) and the first nozzle (28).

2. The exhaust gas treatment mechanism with automatic cleaning function according to claim 1 is characterized in that: A support structure is provided below the spray tower (3), and the support structure comprises a frame (1) and a workbench (2) welded to the upper surface of the frame (1).

3. The exhaust gas treatment mechanism with automatic cleaning function according to claim 2 is characterized in that: The spray tower (3), water tank (26) and booster pump (27) are all bolted to the upper surface of the workbench (2); the output end and input end of the booster pump (27) are both fixedly connected to a first connecting pipe (30); and the two first connecting pipes (30) are respectively fixedly connected to the water tank (26) and the first spray pipe (28).

4. The exhaust gas treatment mechanism with automatic cleaning function according to claim 1 is characterized in that: The connecting pipe (6) is fixedly connected to the gas supply pipe (5) at one end adjacent thereto, and the connecting pipe (6) is fixedly connected to the spray tower (3) and the gas collecting hood (4) at one end away from the gas supply pipe (5). The connecting pipe (6) and the gas supply pipe (5) are both hollow inside, and the gas collecting hood (4) is conical in shape.

5. The exhaust gas treatment mechanism with automatic cleaning function according to claim 1 is characterized in that: The filter net bag (11) is compatible with the air collecting hood (4) and has elasticity. A second exhaust fan (9) is installed on the top side of the spray tower (3).

6. The exhaust gas treatment mechanism with automatic cleaning function according to claim 1 is characterized in that: A connecting frame fixed to the inner wall of the connecting pipe (6) is welded to the outside of the dual-axis motor (8), and a stabilizing frame (61) supporting the first fan (7) is welded to the connecting pipe (6).

7. The exhaust gas treatment mechanism with automatic cleaning function according to claim 1 is characterized in that: The inside of the two limit plates (14) are both provided with through holes, and the reciprocating rod (15) penetrates through the inside of the two limit plates (14) through the through holes and performs reciprocating motion in cooperation with the sliding cooperation of the cam (22) and the reciprocating slide groove (25).

8. The exhaust gas treatment mechanism with automatic cleaning function according to claim 1 is characterized in that: The return spring (19) surrounds the outer surface of the reciprocating rod (15), the mounting sleeve (20) is hollow inside and sleeved on the outer surface of the reciprocating rod (15), and a locking bolt connected to the reciprocating rod (15) is installed inside the mounting sleeve (20).

9. The exhaust gas treatment mechanism with automatic cleaning function according to claim 1, characterized in that: A buffer pad (1801) is installed at one end of the knocking block (18) away from the connecting rod (17), and the reciprocating slide groove (25) is a cam groove. The reciprocating slide groove (25) is inclined and arranged around the outer surface of the rotating drum (24).

10. The exhaust gas treatment mechanism with automatic cleaning function according to claim 1, characterized in that: The spray tower (3) and the gas pipe (5) are both provided with through holes, and the nozzles on the first spray pipe (28) and the second spray pipe (29) extend through the through holes to the inside of the spray tower (3) and the gas pipe (5), and a maintenance cover and a drain pipe are detachably installed at the bottom of the gas pipe (5).

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