A Roots vacuum pump for environmentally friendly dust removal

Abstract

The invention discloses a Roots vacuum pump for environmental protection dust removal, which relates to a Roots vacuum pump, comprising a Roots vacuum pump housing with a second storage battery installed on the surface, an air inlet pipe and an air exhaust pipe respectively installed on the top and bottom of the Roots vacuum pump housing, wherein two limit frames are rotatably arranged in the Roots vacuum pump housing, and slide grooves are provided on both sides of the limit frames, and a connecting piece is slidably connected in the slide grooves; the invention can enable the driving shaft of the motor to drive the second bevel gear to rotate by turning on the motor, and the second bevel gear can drive the first bevel gear and the bidirectional screw rod to rotate at the same time, so that the two first L-shaped pieces can drive the connecting piece and the impeller blades to approach each other in the two slide grooves, thereby reducing the length between the two end portions of the two impeller blades, effectively avoiding the problem of explosion caused by sparks igniting inflammable and explosive gases due to friction between the impeller blades themselves and the inner wall of the Roots vacuum pump housing, thereby improving safety.

Description

Technical Field

[0001] The invention relates to the technical field of Roots vacuum pumps, in particular to a Roots vacuum pump used for environmentally friendly dust removal. Background Art

[0002] Roots vacuum pump is one of the vacuum pumps. Roots vacuum pump (abbreviated as: Roots pump) refers to a variable volume vacuum pump equipped with two leaf-shaped rotors rotating synchronously in opposite directions, with a small gap between the rotors and between the rotors and the inner wall of the pump casing, but not in contact with each other. Roots vacuum pump is often used to handle dusty gases. When in use, a gas purification structure is usually set in front of the Roots vacuum pump to first block dust, and then cooperate with the Roots vacuum pump to generate suction to absorb the purified gas and transport it to the designated location.

[0003] In the existing Roots vacuum pumps mentioned above, the distance between the blade-shaped rotor and the casing is certain. Since the gas purification structure installed at the front end of the Roots vacuum pump cannot completely block the gas, a small amount of gas will still enter the pump casing and adhere to the blade-shaped rotor, causing the area of ​​the blade-shaped rotor to increase accordingly. If the gas transported is flammable and explosive, the blade-shaped rotor that has become larger due to the adhesion of dust will rub against the inner casing of the pump, which may easily cause an explosion problem, posing a great safety hazard.

[0004] Therefore, we designed a Roots vacuum pump for environmentally friendly dust removal to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a Roots vacuum pump for environmentally friendly dust removal to solve the problems raised in the above background technology.

[0006] To solve the above technical problems, the present invention provides a Roots vacuum pump for environmentally friendly dust removal, comprising a Roots vacuum pump housing with a second battery mounted on the surface, an air inlet pipe and an exhaust pipe respectively mounted on the top and bottom of the Roots vacuum pump housing, two limit frames rotatably arranged in the Roots vacuum pump housing, slide grooves are provided on both sides of the limit frames, a connecting piece is slidably connected in the slide groove, an impeller blade is fixedly mounted on the other end of the connecting piece, a bidirectional screw is rotatably arranged in the limit frame, two first L-shaped pieces are threadedly sleeved on the bidirectional screw, the other end of the first L-shaped piece passes through the limit frame and is fixedly connected to the connecting piece, and a drive assembly is arranged in the limit frame for driving the bidirectional screw to rotate.

[0007] Furthermore, the driving assembly includes a first bevel gear, which is fixedly sleeved on the bidirectional screw rod. A motor is fixedly installed in the limit frame, and a second bevel gear is fixedly sleeved on the driving shaft of the motor. The second bevel gear is meshingly connected with the first bevel gear.

[0008] Furthermore, it also includes a limit assembly for limiting the sliding of the impeller blades, the limit assembly includes a guide rod, the guide rod is fixedly installed in the limit frame, two second L-shaped parts are slidably sleeved on the guide rod, and the other end of the second L-shaped part passes through the limit frame and is fixedly connected to the connecting piece.

[0009] Furthermore, two installation cavities are symmetrically opened inside the limit frame, the bidirectional screw is rotatably installed in one of the installation cavities, the motor is fixedly installed in one of the installation cavities, and both ends of the guide rod are fixedly installed in the other of the installation cavities.

[0010] Furthermore, it also includes a cooling component, which is used to cool down and flame retardant the inside of the Roots vacuum pump housing. The cooling component includes two serpentine grooves, which are opened in the impeller blades. Two connecting pipes are symmetrically fixedly inserted in the two serpentine grooves. A liquid storage chamber and a fixed chamber are opened in the limit frame. The serpentine groove and the liquid storage chamber both store coolant. The other ends of the two connecting pipes are respectively slidably inserted in the liquid storage chamber and the fixed chamber. A micro water pump is fixedly installed in the fixed chamber. Connecting pipes are fixedly installed at both ends of the micro water pump. One of the connecting pipes in the two serpentine grooves is slidably sleeved on the two connecting pipes.

[0011] Furthermore, a first storage battery is fixedly installed in the fixed cavity, and the first storage battery is electrically connected to the micro water pump.

[0012] Furthermore, a sealing cover is hinged on the exhaust duct, an electric push rod is fixedly installed on one side of the sealing cover, a fixing part is provided at the driving end of the electric push rod, a wiping cotton is provided on one side of the fixing part, the wiping cotton cooperates with the exhaust duct to be slidably inserted in the exhaust duct and leaves a gap with the inner circle of the exhaust duct, and the wiping cotton cooperates with the impeller blade to abut against each other.

[0013] Furthermore, a sub-velcro is fixedly installed on one side of the fixing piece, a main-velcro is fixedly installed on one side of the wiping cotton, and the sub-velcro is bonded to the main-velcro.

[0014] Furthermore, a mounting piece is installed at the bottom of the Roots vacuum pump housing, the number of the mounting pieces is two, and the two mounting pieces are symmetrically installed on the front and rear sides of the bottom of the Roots vacuum pump housing, the length of the mounting piece is longer than the diameter of the sealing cover, and the mounting piece is used for threaded insertion of screws.

[0015] Furthermore, a rotating shaft is fixedly installed at both the front and rear ends of the limit frame, and the other end of the rotating shaft is rotatably connected in the Roots vacuum pump housing, wherein the two rotating shafts at the rear end are used to connect to the driving member arranged in the Roots vacuum pump housing.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By turning on the motor, the driving shaft of the motor can drive the second bevel gear to rotate, and at the same time, the second bevel gear will drive the first bevel gear and the bidirectional screw to rotate, so that the two first L-shaped parts can drive the connecting parts and the impeller blades to approach each other in the two slide grooves, thereby reducing the length between the two ends of the two impeller blades, and effectively avoiding the problem of sparks igniting flammable and explosive gases due to friction between the impeller blades themselves and the inner wall of the Roots vacuum pump housing, thereby improving safety.

[0017] 2. By turning on the micro water pump, the micro water pump can be operated to make the cooling water stored in the serpentine groove circulate through the connecting pipe and the connecting pipe, so as to absorb the heat in the Roots vacuum pump housing, and the water heated up by absorbing the heat in the serpentine groove will be injected into the liquid storage chamber for heat exchange, so as to achieve the effect of cooling the Roots vacuum pump housing and further improve the flame retardant effect.

[0018] 3. By rotating the sealing cover to the bottom of the exhaust duct and then turning on the electric push rod, the driving end of the electric push rod can be extended to drive the wiping cotton to slide on the inner ring of the exhaust duct, and then the impeller blades can continue to rotate, so that the impeller blades can contact the wiping cotton and wipe the dust by friction with the impeller blades. The gas generated by the impeller blades can be discharged through the gap between the wiping cotton and the inner ring of the exhaust duct, and the dust on the impeller blades can be removed to avoid explosion problems caused by friction between dust and flammable and explosive gases, which can further improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the front exterior of the present invention;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the inner side of the housing of the Roots vacuum pump of the present invention;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the inner half-section of the limit frame and the impeller blade combination of the present invention;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the inner half-section side of the limit frame and impeller blade combination of the present invention;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the outer part of the limit frame and the impeller blade combination of the present invention;

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of a separate inner half-section of an impeller blade of the present invention;

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the exterior of the blocking cover of the present invention;

[0026] Figure 8 For the present invention Figure 3 Enlarged view of point A in the middle.

[0027] In the figure: 1. Roots vacuum pump housing; 2. Air inlet pipe; 3. Exhaust pipe; 4. Limiting frame; 5. Connecting piece; 6. Impeller blade; 7. Bidirectional screw; 8. First L-shaped piece; 9. First bevel gear; 10. Motor; 11. Second bevel gear; 12. Guide rod; 13. Second L-shaped piece; 14. Serpentine groove; 15. Connecting pipe; 16. Liquid storage chamber; 17. Micro water pump; 18. Connecting pipe; 19. First battery; 20. Installation chamber; 21. Fixed chamber; 22. Sealing cover; 23. Electric push rod; 24. Fixed piece; 25. Wiping cotton; 26. Sub-Velcro; 27. Sub-Velcro; 28. Mounting piece; 29. ​​Second battery; 30. Rotating shaft; 31. Slide groove. DETAILED DESCRIPTION

[0028] 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.

[0029] See also Figure 1-8 The present invention provides a technical solution: a Roots vacuum pump for environmental dust removal, comprising a Roots vacuum pump housing 1 with a second storage battery 29 mounted on the surface, an air inlet pipe 2 and an air exhaust pipe 3 mounted on the top and bottom of the Roots vacuum pump housing 1, two limit frames 4 are rotatably arranged in the Roots vacuum pump housing 1, both sides of the limit frame 4 are provided with a slide groove 31, a connecting piece 5 is slidably connected in the slide groove 31, and an impeller blade 6 is fixedly mounted on the other end of the connecting piece 5, a bidirectional screw rod 7 is rotatably arranged in the limit frame 4, two first L-shaped pieces 8 are threadedly sleeved on the bidirectional screw rod 7, and the other end of the first L-shaped piece 8 passes through the limit frame 4 and is fixedly connected with the connecting member 5. A driving assembly is arranged in the limiting frame 4 for driving the bidirectional screw rod 7 to rotate. The driving assembly includes a first bevel gear 9, which is fixedly sleeved on the bidirectional screw rod 7. A motor 10 is fixedly installed in the limiting frame 4. The driving shaft of the motor 10 is fixedly sleeved with a second bevel gear 11, which is meshed and connected with the first bevel gear 9. A rotating shaft 30 is fixedly installed at both the front and rear ends of the limiting frame 4. The other end of the rotating shaft 30 is rotatably connected in the Roots vacuum pump housing 1, wherein the two rotating shafts 30 located at the rear end are used to connect the driving member arranged in the Roots vacuum pump housing 1.

[0030] During specific implementation, in the process of conveying gas, flammable and explosive gas may also be conveyed. Since the purified gas still contains a small amount of dust, the dust will adhere to the impeller blades 6 more and more over time. In order to avoid the problem that multiple impeller blades 6 rub against each other and ignite with the inner wall of the Roots vacuum pump housing 1 due to excessive dust adhesion, the motor 10 can be turned on to make the drive shaft of the motor 10 drive the second bevel gear 11 to rotate. At the same time, the second bevel gear 11 will drive the first bevel gear 9 and the bidirectional screw 7 to rotate, so that the two first L-shaped parts 8 can drive the connecting part 5 and the impeller blades 6 to approach each other in the two slide grooves 31, thereby reducing the length between the two ends of the two impeller blades 6, and effectively avoiding the problem that the impeller blades 6 rub against themselves and the inner wall of the Roots vacuum pump housing 1 to cause sparks to ignite the flammable and explosive gas and cause an explosion, thereby improving safety.

[0031] In addition, when the Roots vacuum pump housing 1 is in operation, the driving parts in the Roots vacuum pump housing 1 can be set as two motors (not shown in the figure), both of which are installed on the inner rear wall of the Roots vacuum pump housing 1 and are transmission-connected to one end of the rotating shaft 30, and the driving shafts of the two motors rotate in opposite directions. During the specific operation: the two motors are turned on, and the driving shafts of the two motors can be made to rotate forward and reversely to drive the two limit frames 4, the connecting piece 5 and the four impeller blades 6 to rotate. During this process, the four impeller blades 6 are combined to rotate in an "8" shape. At this time, the gas is sucked from the air inlet pipe 2 into the space formed by the impeller blades 6 and the inner wall of the Roots vacuum pump housing 1, and a gap is generated. As the impeller blades 6 continue to rotate, the sucked gas is closed by the impeller blades 6 and the inner wall of the Roots vacuum pump housing 1, and is gradually compressed. When the impeller blades 6 rotate to a specific position, the gas with a higher pressure at the end of the exhaust pipe 3 is recoiled into this part of the space, and is driven and pressed to the exhaust pipe 3 together with the sealed gas, thereby realizing the discharge of the gas.

[0032] See also Figure 1-8 The figure shows that it also includes a limit assembly for limiting the sliding of the impeller blade 6. The limit assembly includes a guide rod 12, which is fixedly installed in the limit frame 4. Two second L-shaped members 13 are slidably sleeved on the guide rod 12. The other end of the second L-shaped member 13 passes through the limit frame 4 and is fixedly connected to the connecting member 5. Two installation cavities 20 are symmetrically provided inside the limit frame 4. The bidirectional screw rod 7 is rotatably installed in one of the installation cavities 20. The motor 10 is fixedly installed in one of the installation cavities 20. Both ends of the guide rod 12 are fixedly installed in the other installation cavity 20.

[0033] In a specific implementation, based on the above implementation, when the connecting member 5 slides in the slide groove 31, the second L-shaped member 13 can slide along on the guide rod 12, and the sliding direction of the connecting member 5 can be limited to avoid the problem of tilting at both ends of the connecting member 5, thereby improving stability.

[0034] See also Figure 1-8 , and also includes a cooling component, which is used to cool down the Roots vacuum pump housing 1 and prevent it from burning. The cooling component includes two serpentine grooves 14, which are opened in the impeller blade 6, and two connecting pipes 15 are symmetrically fixedly inserted in the two serpentine grooves 14. A liquid storage chamber 16 and a fixed chamber 21 are opened in the limit frame 4. The serpentine grooves 14 and the liquid storage chamber 16 both store coolant. The other ends of the two connecting pipes 15 are respectively slidably inserted in the liquid storage chamber 16 and the fixed chamber 21. A micro water pump 17 is fixedly installed in the fixed chamber 21, and connecting pipes 18 are fixedly installed at both ends of the micro water pump 17. One of the connecting pipes 15 in the two serpentine grooves 14 is respectively slidably sleeved on the two connecting pipes 18. A first battery 19 is also fixedly installed in the fixed chamber 21, and the first battery 19 is electrically connected to the micro water pump 17.

[0035] In specific implementation, on the basis of the above implementation, when the inflammable and explosive gas is continuously transported, a higher temperature can be generated in the Roots vacuum pump housing 1, and the high temperature can also support combustion. At this time, the micro water pump 17 is turned on, and the micro water pump 17 is operated to make the cooling water stored in the serpentine groove 14 circulate through the connecting pipe 15 and the connecting pipe 18, so that the heat in the Roots vacuum pump housing 1 can be absorbed, and the water in the serpentine groove 14 that absorbs the heat and heats up will be injected into the liquid storage chamber 16 for heat exchange, so as to achieve the effect of cooling the Roots vacuum pump housing 1, and the flame retardant effect can be further improved.

[0036] See also Figure 1-8 A blocking cover 22 is hinged on the exhaust duct 3, and an electric push rod 23 is fixedly installed on one side of the blocking cover 22. A fixing part 24 is provided at the driving end of the electric push rod 23, and a wiping cotton 25 is provided on one side of the fixing part 24. The wiping cotton 25 cooperates with the exhaust duct 3 to be slidably inserted in the exhaust duct 3 and leaves a gap with the inner circle of the exhaust duct 3, and the wiping cotton 25 cooperates with the impeller blade 6 to abut against each other, a sub-Velcro 26 is fixedly installed on one side of the fixing part 24, and a mother Velcro 27 is fixedly installed on one side of the wiping cotton 25, and the sub-Velcro 26 is bonded to the mother Velcro 27.

[0037] On the basis of the above implementation, since dust and inflammable and explosive gases are also prone to explosion when they collide at high speed, the blocking cover 22 is rotated to the bottom of the exhaust pipe 3 at this time, and then the electric push rod 23 is turned on, so that the driving end of the electric push rod 23 is extended to drive the wiping cotton 25 to slide on the inner ring of the exhaust pipe 3, and then the impeller blade 6 continues to rotate, so that the impeller blade 6 can contact with the wiping cotton 25 and wipe the dust and the impeller blade 6 by friction. The gas generated by the impeller blade 6 can be discharged through the gap generated by the wiping cotton 25 and the inner ring of the exhaust pipe 3, and the dust on the impeller blade 6 can be removed to avoid the explosion problem caused by the friction between the dust and the inflammable and explosive gases, and the safety can be further improved; after the wiping cotton 25 has wiped the dust, the wiping cotton 25 can be pulled to separate the sub-Velcro 26 from the mother Velcro 27, and then the new wiping cotton 25 drives the mother Velcro 27 on it to bond with the sub-Velcro 26, so that the wiping cotton 25 can be easily replaced, which is convenient for wiping the impeller blade 6 next time.

[0038] See also Figure 1-8 The bottom of the Roots vacuum pump housing 1 is provided with a mounting member 28. There are two mounting members 28, and the two mounting members 28 are symmetrically mounted on the front and rear sides of the bottom of the Roots vacuum pump housing 1. The length of the mounting member 28 is longer than the diameter of the blocking cover 22. The mounting member 28 is used for threaded insertion of screws. The Roots vacuum pump housing 1 can be conveniently mounted at a suitable position by screws for operation.

[0039] Working principle: First, all the electrical appliances except the micro water pump 17 in the Roots vacuum pump housing 1 are connected to the second battery 29, and then the micro water pump 17 is connected to the first battery 19. In addition, the driving member in the Roots vacuum pump housing 1 can be set to two motors (not shown in the figure), both of which are installed on the rear wall of the Roots vacuum pump housing 1 and are connected to one end of the rotating shaft 30, and the driving shafts of the two motors rotate in opposite directions. When operating specifically: turn on the two motors, the driving shafts of the two motors can be turned forward and reverse to drive the two limit frames 4 and the connecting parts 5 and four impeller blades 6 rotate. During this process, the four impeller blades 6 rotate in an "8" shape. At this time, the gas is sucked from the air inlet pipe 2 into the space formed by the impeller blades 6 and the inner wall of the Roots vacuum pump housing 1, and a gap is generated. As the impeller blades 6 continue to rotate, the sucked gas is sealed by the impeller blades 6 and the inner wall of the Roots vacuum pump housing 1 and is gradually compressed. When the impeller blades 6 rotate to a specific position, the gas with a higher pressure at the end of the exhaust pipe 3 is recoiled into this part of the space and is driven and pressed to the exhaust pipe 3 together with the sealed gas, thereby realizing the discharge of the gas;

[0040] In the process of conveying gas above, inflammable and explosive gas may also be conveyed. Since the purified gas still contains a small amount of dust, the dust will adhere to the impeller blades 6 more and more over time. In order to avoid the problem of multiple impeller blades 6 rubbing against each other and rubbing against the inner wall of the Roots vacuum pump housing 1 to cause fire due to excessive dust adhesion, the motor 10 can be turned on to make the driving shaft of the motor 10 drive the second bevel gear 11 to rotate. At the same time, the second bevel gear 11 will drive the first bevel gear 9 and the bidirectional screw 7 to rotate, so that the two first L-shaped parts 8 can drive the connecting part 5 and the impeller blades 6 to approach each other in the two slide grooves 31, thereby reducing the length between the two ends of the two impeller blades 6, and effectively avoiding the problem of sparks igniting the inflammable and explosive gas due to the friction between the impeller blades 6 and the inner wall of the Roots vacuum pump housing 1, thereby improving safety.

[0041] In addition, when the inflammable and explosive gas is continuously transported, a relatively high temperature may be generated in the Roots vacuum pump housing 1, and the high temperature may also support combustion. At this time, the micro water pump 17 is turned on and the micro water pump 17 is operated to make the cooling water stored in the serpentine groove 14 circulate through the connecting pipe 15 and the connecting pipe 18, so that the heat in the Roots vacuum pump housing 1 can be absorbed, and the water heated by absorbing the heat in the serpentine groove 14 will be injected into the liquid storage chamber 16 for heat exchange, so as to achieve the effect of cooling the Roots vacuum pump housing 1, and further improve the flame retardant effect;

[0042] It should be noted that, since dust and inflammable and explosive gases are also very likely to explode when they collide at high speed, the blocking cover 22 is rotated to the bottom of the exhaust pipe 3 at this time, and then the electric push rod 23 is turned on, so that the driving end of the electric push rod 23 is extended to drive the wiping cotton 25 to slide on the inner ring of the exhaust pipe 3, and then the impeller blade 6 is rotated continuously, so that the impeller blade 6 can contact with the wiping cotton 25 and wipe the dust and the impeller blade 6 by friction. The gas generated by the impeller blade 6 can be discharged through the gap generated by the wiping cotton 25 and the inner ring of the exhaust pipe 3, and the dust on the impeller blade 6 can be removed to avoid the explosion problem caused by the friction between the dust and the inflammable and explosive gas, and the safety can be further improved;

[0043] After the wiping cotton 25 has wiped the dust, the wiping cotton 25 can be pulled to separate the child Velcro 26 from the mother Velcro 27, and then the new wiping cotton 25 drives the mother Velcro 27 on it to adhere to the child Velcro 26, so that the wiping cotton 25 can be easily replaced, which is convenient for wiping the impeller blade 6 next time;

[0044] It should be noted that when the electric push rod 23 is located at the bottom of the exhaust duct 3, personnel can use a buckle and a snap ring to connect them. The snap ring is installed on the exhaust duct 3, and the buckle is installed on one side of the electric push rod 23. Then, the buckle is made of a slightly deformable material so that the buckle can be clamped on the snap ring to position the sealing cover 22. Since the buckle and the snap ring are both existing technologies and are not a problem that needs to be solved in the background technology, they will not be explained in detail in this manual.

Claims

1. A Roots vacuum pump for environmental dust removal, comprising a Roots vacuum pump housing (1) with a second storage battery (29) mounted on the surface, an air inlet pipe (2) and an air outlet pipe (3) respectively mounted on the top and bottom of the Roots vacuum pump housing (1), characterized in that: Two limit frames (4) are rotatably arranged in the housing (1) of the Roots vacuum pump. Slide grooves (31) are provided on both sides of the limit frames (4). A connecting piece (5) is slidably connected in the slide groove (31). An impeller blade (6) is fixedly installed on the other end of the connecting piece (5). A bidirectional screw rod (7) is rotatably arranged in the limit frames (4). Two first L-shaped pieces (8) are threadedly sleeved on the bidirectional screw rod (7). The other end of the first L-shaped piece (8) passes through the limit frames (4) and is fixedly connected to the connecting piece (5). A driving component is arranged in the limit frames (4) for driving the bidirectional screw rod (7) to rotate.

2. A Roots vacuum pump for environmentally friendly dust removal as claimed in claim 1, characterized in that: The driving assembly comprises a first bevel gear (9), the first bevel gear (9) is fixedly sleeved on a bidirectional screw rod (7), a motor (10) is fixedly installed in the limit frame (4), a driving shaft of the motor (10) is fixedly sleeved with a second bevel gear (11), and the second bevel gear (11) is meshingly connected with the first bevel gear (9).

3. A Roots vacuum pump for environmentally friendly dust removal as claimed in claim 2, characterized in that: It also includes a limiting component for limiting the sliding of the impeller blade (6), the limiting component including a guide rod (12), the guide rod (12) being fixedly mounted in the limiting frame (4), two second L-shaped members (13) being slidably sleeved on the guide rod (12), the other end of the second L-shaped member (13) passing through the limiting frame (4) and being fixedly connected to the connecting member (5).

4. A Roots vacuum pump for environmentally friendly dust removal as claimed in claim 3, characterized in that: The limiting frame (4) has two symmetrically arranged installation cavities (20), the bidirectional screw rod (7) is rotatably installed in one of the installation cavities (20), the motor (10) is fixedly installed in one of the installation cavities (20), and both ends of the guide rod (12) are fixedly installed in the other of the installation cavities (20).

5. A Roots vacuum pump for environmentally friendly dust removal as claimed in claim 1, characterized in that: The invention also comprises a cooling assembly, which is used for cooling the inside of a Roots vacuum pump housing (1) and preventing flame retardancy. The cooling assembly comprises two serpentine grooves (14), which are arranged in an impeller blade (6). Two connecting pipes (15) are symmetrically fixedly inserted in the two serpentine grooves (14). A liquid storage chamber (16) and a fixed chamber (21) are arranged in the limiting frame (4). The serpentine groove (14) and the liquid storage chamber (16) both store cooling liquid. The other ends of the two connecting pipes (15) are respectively slidably inserted in the liquid storage chamber (16) and the fixed chamber (21). A micro water pump (17) is fixedly installed in the fixed chamber (21). Connecting pipes (18) are fixedly installed at both ends of the micro water pump (17). One of the connecting pipes (15) in the two serpentine grooves (14) is respectively slidably sleeved on the two connecting pipes (18).

6. A Roots vacuum pump for environmentally friendly dust removal as claimed in claim 5, characterized in that: A first storage battery (19) is also fixedly installed in the fixed cavity (21), and the first storage battery (19) is electrically connected to the micro water pump (17).

7. A Roots vacuum pump for environmentally friendly dust removal as claimed in claim 1, characterized in that: A blocking cover (22) is hingedly connected to the exhaust pipe (3), an electric push rod (23) is fixedly installed on one side of the blocking cover (22), a fixing part (24) is provided at the driving end of the electric push rod (23), a wiping cotton (25) is provided on one side of the fixing part (24), the wiping cotton (25) cooperates with the exhaust pipe (3) to be slidably inserted in the exhaust pipe (3) and leaves a gap with the inner circle of the exhaust pipe (3), and the wiping cotton (25) cooperates with the impeller blade (6) to abut against each other.

8. A Roots vacuum pump for environmentally friendly dust removal as claimed in claim 7, characterized in that: A sub-velcro (26) is fixedly mounted on one side of the fixing member (24), a main-velcro (27) is fixedly mounted on one side of the wiping cotton (25), and the sub-velcro (26) is bonded to the main-velcro (27).

9. A Roots vacuum pump for environmentally friendly dust removal as claimed in claim 7, characterized in that: A mounting member (28) is installed at the bottom of the Roots vacuum pump housing (1). The number of the mounting members (28) is two, and the two mounting members (28) are symmetrically installed at the front and rear sides of the bottom of the Roots vacuum pump housing (1). The length of the mounting member (28) is longer than the diameter of the sealing cover (22), and the mounting member (28) is used for threaded insertion of screws.

10. A Roots vacuum pump for environmentally friendly dust removal as claimed in claim 1, characterized in that: A rotating shaft (30) is fixedly mounted at both the front and rear ends of the limiting frame (4), and the other end of the rotating shaft (30) is rotatably connected in a Roots vacuum pump housing (1), wherein the two rotating shafts (30) located at the rear end are both used to connect to a driving component arranged in the Roots vacuum pump housing (1).

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