A Roots vacuum pump

Abstract

The present invention relates to a vacuum pump device, in particular to a Roots vacuum pump, comprising a pump body, wherein the bottom end of the pump body is fixedly connected with a base, the interior of the pump body is arranged as a hollow structure, the inner wall of the pump body is arranged with a crushing mechanism, both ends of the pump body are fixedly connected with a shell, the inner wall of the shell is arranged with an extrusion mechanism on the side close to the pump body, the outer surface of a bearing seat located on the left side of the pump body is fixedly connected with a motor, the left end of a main shaft passes through the outer surface of the bearing seat and is fixedly connected with an output shaft of the motor, primary gears are fixedly connected with both sides of the outer surface of the main shaft, secondary gears are fixedly connected with both sides of the outer surface of the secondary shaft, and the primary gear is meshed with the secondary gear. The present invention can crush block materials by arranging a crushing mechanism, so as to prevent the pump from being unable to crush materials in the process of conveying materials, causing blockage inside the pump body, causing vibration of the pump, and damaging the pump if it is operated for a long time, thereby extending the service life of the pump.

Description

Technical Field

[0001] The invention relates to a vacuum pump device, in particular to a Roots vacuum pump. Background Art

[0002] Roots vacuum pump (abbreviated as Roots pump) is a rotary variable displacement vacuum pump, which is evolved from Roots blower; Patent No.: CN108799112B discloses a Roots vacuum pump, including a housing, a rotor cavity, an inner sleeve and a cooling cavity, the interior of the cooling cavity is connected with a partition plate, and the cooling cavity is divided into a first cooling water channel on the inside and a second cooling water channel on the outside by the partition plate, the first cooling water channel is connected to the water inlet, the second cooling water channel is connected to the water outlet, and a cylindrical cavity is opened at the bottom of the cooling cavity, and the cylindrical cavity is provided. A slag storage trough is connected to the bottom of the cavity, a rotating shaft is inserted into the cylindrical cavity, a knob is connected to the outside of the rotating shaft, the rotating shaft located on the inner side of the cylindrical cavity is connected to a first metal frame, a second metal frame is also connected to the rotating shaft, the second metal frame is perpendicular to the first metal frame, an arc panel is fixedly connected to the outside of the second metal frame, bristles are connected to the outside of the arc panel, and an arc mesh is connected to the outside of one end of the first metal frame. The present invention can improve the deficiencies of the prior art and prevent metal residues in the pump cooling cavity itself from causing blockage of the cooling water channel.

[0003] The existing Roots vacuum pump is used to transport materials in aquaculture, but the pump cannot break up bulk materials during the transportation process. It is easy to cause blockage inside the pump body during the transportation process, causing the pump to vibrate and affect normal operation. Long-term operation will cause damage to the pump and shorten the service life of the pump.

[0004] Therefore, a Roots vacuum pump is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a Roots vacuum pump, which mainly solves the problem that the pump cannot break up bulk materials during the process of conveying materials, which easily causes blockage inside the pump body during the conveying process, causing the pump to vibrate, affecting normal operation, and causing damage to the pump during long-term operation, thereby shortening the service life of the pump.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A Roots vacuum pump comprises a pump body, wherein the bottom end of the pump body is fixedly connected to a base, the interior of the pump body is arranged as a hollow structure, the inner wall of the pump body is arranged with a crushing mechanism, both ends of the pump body are fixedly connected to a shell, a side of the inner wall of the shell close to the pump body is arranged with an extrusion mechanism, the other end of the shell is fixedly connected to a bearing seat, the end of the bearing seat close to the shell is provided with a primary bearing groove and a secondary bearing groove, the primary bearing groove and the secondary bearing groove are symmetrically distributed on both sides of the shell, the primary bearing groove is rotatably connected to a main shaft through a bearing, the secondary bearing groove is rotatably connected to a secondary shaft through a bearing, the outer surface of the bearing seat located on the left side of the pump body is fixedly connected to a motor, the left end of the main shaft passes through the outer surface of the bearing seat and is fixedly connected to the output shaft of the motor, primary gears are fixedly connected to both sides of the outer surface of the main shaft, secondary gears are fixedly connected to both sides of the outer surface of the secondary shaft, and the primary gear is meshed with the secondary gear.

[0008] By adopting the above technical solution, when the user needs to convey materials, the motor is started first, and then the main shaft is driven to rotate by the output shaft of the motor, and then the secondary shaft is driven to rotate by the mutual engagement of the primary gear and the secondary gear, and then the crushing mechanism is driven by the extrusion mechanism to crush the block material, so as to prevent the pump from being unable to crush the material during the material conveying process, causing blockage inside the pump body, causing the pump to vibrate, and long-term operation will cause damage to the pump, thereby extending the service life of the pump.

[0009] Preferably, a primary groove is opened at both ends of the inner wall of the pump body, an end cover is arranged in the primary groove, a double-layer sealing ring is fixedly connected to the outer surface of the end cover, the outer surface of the double-layer sealing ring is slidably connected to the inner wall of the primary groove, the two ends of the main shaft and the secondary shaft pass through the outer surface of the end cover, and the outer surface of the main shaft and the secondary shaft is slidably connected to the inner wall of the end cover.

[0010] By adopting the above technical solution, the end cover can be used to extrude the end cover by the extrusion mechanism, thereby driving the crushing mechanism to crush the material; and the sealing performance inside the pump body can be enhanced by arranging a double-layer sealing ring.

[0011] Preferably, the crushing mechanism includes an impeller, a secondary groove, a spring and a bellows. A plurality of impellers are provided, and the plurality of impellers are respectively sleeved on the outer surfaces of the main shaft and the secondary shaft. Secondary grooves are provided on both sides of the impeller. A spring is provided between two adjacent impellers. The spring is sleeved on the outer surfaces of the main shaft and the secondary shaft, and both ends of the spring are respectively fixedly connected to the inner walls of the secondary grooves. A bellows is provided on the outer surface of the spring, and both ends of the bellows are respectively fixedly connected to the inner walls of the secondary grooves.

[0012] By adopting the above technical solution, the spring in the middle of the impeller can be compressed by squeezing the impellers on both sides of the pump body through the end covers, so that the material can be crushed by squeezing the impeller in the middle of the pump body through the spring, and at the same time the bellows contracts to the middle position between the two adjacent impellers; by providing the bellows, the material can be prevented from entering the interior of the spring after being squeezed and affecting the subsequent use of the spring.

[0013] Preferably, the extrusion mechanism includes a rotating shaft, a two-stage bevel gear and a cam, the two ends of the rotating shaft are rotatably connected to the inner wall of the shell, the outer surface of the rotating shaft is fixedly connected to the cam at the middle position, the outer surface of the rotating shaft is fixedly connected to the two-stage bevel gear on one side of the cam, and the outer surface of the cam is slidably connected to the outer surface of the end cover.

[0014] By adopting the above technical solution, the rotating shaft is driven to rotate by the secondary bevel gear, and then the rotating shaft drives the cam to squeeze the end cover to squeeze the crushing mechanism to crush the material.

[0015] Preferably, a primary bevel gear is fixedly connected to the outer surface of the main shaft and a side close to the extrusion mechanism, and the primary bevel gear is meshed with the secondary bevel gear.

[0016] By adopting the above technical solution, a primary bevel gear is fixedly connected to the outer surface of the main shaft and the side close to the extrusion mechanism, and the primary bevel gear is meshed with the secondary bevel gear, thereby providing a power source for the extrusion mechanism.

[0017] Preferably, a feed pipe is provided on the left side of the pump body, and a discharge pipe is provided on the right side of the pump body, and the feed pipe and the discharge pipe are connected to the inner wall of the pump body.

[0018] By adopting the above technical solution, a feed pipe is arranged on the left side of the pump body, and a discharge pipe is arranged on the right side of the pump body. The feed pipe and the discharge pipe are connected to the inner wall of the pump body, which is convenient for quick installation of the pipeline and the pump body and convenient use.

[0019] Preferably, a slider is provided on the inner wall of the impeller, and sliding grooves are provided on the outer surfaces of the main shaft and the secondary shaft. The slider is adapted to the sliding grooves, the impeller on the outer surface of the main shaft and the impeller on the outer surface of the secondary shaft are perpendicular to each other, and the outer surface of the impeller is slidably connected to the inner wall of the pump body.

[0020] By adopting the above technical solution and setting the slider and the slide groove, the main shaft and the secondary shaft can drive the impeller to rotate, and the impeller can be prevented from sliding along the outer surface of the main shaft and the secondary shaft during rotation.

[0021] Preferably, the double-layer sealing ring is made of wear-resistant material.

[0022] By adopting the above technical solution and setting the double-layer sealing ring to be made of wear-resistant material, it is possible to prevent the double-layer sealing ring from sliding along the inner wall of the primary groove and being worn, thereby preventing the sealing performance of the pump body from being reduced.

[0023] Preferably, the inner wall of the shell is flush with the inner wall of the pump body, and the width of the outer surface of the end cover is greater than the width of the inner wall of the shell.

[0024] By adopting the above technical solution, by setting the inner wall of the shell to be flush with the inner wall of the pump body, the width of the outer surface of the end cover is greater than the width of the inner wall of the shell, which can play a role in limiting the end cover.

[0025] Preferably, the bellows is made of elastic material.

[0026] By adopting the above technical solution and setting the material of the bellows to be elastic material, it is possible to prevent the bellows from being deformed after being stretched for a long time or cracks from appearing on the surface of the bellows, thereby affecting the normal use of the pump next time.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the present invention, when the user needs to convey materials, the motor is started first, and then the main shaft is driven to rotate by the output shaft of the motor, and then the secondary shaft is driven to rotate by the mutual engagement of the primary gear and the secondary gear, and then the crushing mechanism is driven by the extrusion mechanism to crush the block material, so as to prevent the pump from being unable to crush the material during the process of conveying the material, causing blockage inside the pump body, causing the pump to vibrate, and long-term operation will cause damage to the pump, thereby extending the service life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a front view of the present invention;

[0031] Figure 2 It is a left side view of the present invention;

[0032] Figure 3 For the present invention Figure 2 A schematic diagram of the cross-sectional structure at AA;

[0033] Figure 4 For the present invention Figure 3A schematic diagram of the cross-sectional structure at BB;

[0034] Figure 5 For the present invention Figure 3 A partial enlarged schematic diagram of point C.

[0035] In the figure: pump body 1, primary groove 101, base 2, shell 3, bearing seat 4, motor 5, main shaft 6, secondary shaft 7, crushing mechanism 8, impeller 81, secondary groove 82, spring 83, bellows 84, extrusion mechanism 9, rotating shaft 91, secondary bevel gear 92, cam 93, feed pipe 10, discharge pipe 11, end cover 12, double-layer sealing ring 121, primary gear 13, secondary gear 14, primary bevel gear 15, slider 16, slide groove 17. DETAILED DESCRIPTION

[0036] 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.

[0037] See also Figures 1 to 5 , the present invention provides a technical solution:

[0038] A Roots vacuum pump comprises a pump body 1, wherein a base 2 is fixedly connected to the bottom end of the pump body 1, the interior of the pump body 1 is arranged as a hollow structure, a crushing mechanism 8 is arranged on the inner wall of the pump body 1, a shell 3 is fixedly connected to both ends of the pump body 1, a squeezing mechanism 9 is arranged on the inner wall of the shell 3 close to the pump body 1, a bearing seat 4 is fixedly connected to the other end of the shell 3, a primary bearing groove and a secondary bearing groove are opened on the end of the bearing seat 4 close to the shell 3, the primary bearing groove and the secondary bearing groove are symmetrically distributed on both sides of the shell 3, the primary bearing groove is rotatably connected to a main shaft 6 through a bearing, the secondary bearing groove is rotatably connected to a secondary shaft 7 through a bearing, a motor 5 is fixedly connected to the outer surface of the bearing seat 4 located on the left side of the pump body 1, the left end of the main shaft 6 passes through the outer surface of the bearing seat 4 and is fixedly connected to the output shaft of the motor 5, primary gears 13 are fixedly connected to the outer surface of the main shaft 6 on both sides, secondary gears 14 are fixedly connected to the outer surface of the secondary shaft 7 on both sides, and the primary gear 13 is meshed with the secondary gear 14.

[0039] By adopting the above technical solution, when the user needs to convey materials, the motor 5 is first started, and then the main shaft 6 is driven to rotate by the output shaft of the motor 5, and then the secondary shaft 7 can be driven to rotate by the mutual engagement of the primary gear 13 and the secondary gear 14, and then the crushing mechanism 8 is driven by the extrusion mechanism 9 to crush the block material, so as to prevent the pump from being unable to crush the material during the material conveying process to cause blockage inside the pump body 1, resulting in vibration of the pump, and long-term operation will cause damage to the pump, thereby extending the service life of the pump.

[0040] As an embodiment of the present invention, a primary groove 101 is opened at both ends of the inner wall of the pump body 1, an end cover 12 is arranged in the primary groove 101, a double-layer sealing ring 121 is fixedly connected to the outer surface of the end cover 12, the outer surface of the double-layer sealing ring 121 is slidingly connected to the inner wall of the primary groove 101, the two ends of the main shaft 6 and the secondary shaft 7 pass through the outer surface of the end cover 12, and the outer surface of the main shaft 6 and the secondary shaft 7 are slidingly connected to the inner wall of the end cover 12.

[0041] By adopting the above technical solution, the end cover 12 can be provided so that the extrusion mechanism 9 can extrude the end cover 12 to drive the crushing mechanism 8 to crush the material; and the double-layer sealing ring 121 can be provided to enhance the sealing inside the pump body 1.

[0042] As an embodiment of the present invention, the crushing mechanism 8 includes an impeller 81, a secondary groove 82, a spring 83 and a bellows 84. A plurality of impellers 81 are provided, and the plurality of impellers 81 are respectively sleeved on the outer surfaces of the main shaft 6 and the secondary shaft 7. Secondary grooves 82 are opened on both sides of the impeller 81. A spring 83 is provided between two adjacent impellers 81. The spring 83 is sleeved on the outer surfaces of the main shaft 6 and the secondary shaft 7. The two ends of the spring 83 are respectively fixedly connected to the inner walls of the secondary groove 82. A bellows 84 is provided on the outer surface of the spring 83. The two ends of the bellows 84 are respectively fixedly connected to the inner walls of the secondary groove 82.

[0043] By adopting the above technical solution, the spring 83 in the middle of the impeller 81 can be in a compressed state by squeezing the impellers 81 on both sides of the pump body 1 through the end cover 12, so that the impeller 81 in the middle of the pump body 1 can be squeezed by the spring 83 to crush the material, and at the same time, the bellows 84 contracts to the middle position between the two adjacent impellers 81; by providing the bellows 84, it can be prevented that the material enters the interior of the spring 83 after being squeezed and affects the subsequent use of the spring 83.

[0044] As an embodiment of the present invention, the extrusion mechanism 9 includes a rotating shaft 91, a two-stage bevel gear 92 and a cam 93. The two ends of the rotating shaft 91 are rotatably connected to the inner wall of the shell 3. The outer surface of the rotating shaft 91 is fixedly connected to the cam 93 at the middle position. The outer surface of the rotating shaft 91 is fixedly connected to the two-stage bevel gear 92 on one side of the cam 93. The outer surface of the cam 93 is slidably connected to the outer surface of the end cover 12.

[0045] By adopting the above technical solution, the secondary bevel gear 92 drives the rotating shaft 91 to rotate, and then the rotating shaft 91 drives the cam 93 to squeeze the end cover 12 to squeeze the crushing mechanism 8 to crush the material.

[0046] As an embodiment of the present invention, a primary bevel gear 15 is fixedly connected to the outer surface of the main shaft 6 and one side close to the extrusion mechanism 9 , and the primary bevel gear 15 is meshed with the secondary bevel gear 92 .

[0047] By adopting the above technical solution, a primary bevel gear 15 is fixedly connected to the outer surface of the main shaft 6 and the side close to the extrusion mechanism 9, and the primary bevel gear 15 is meshed with the secondary bevel gear 92, thereby providing a power source for the extrusion mechanism 9.

[0048] As an embodiment of the present invention, a feed pipe 10 is provided on the left side of the pump body 1 , and a discharge pipe 11 is provided on the right side of the pump body 1 . The feed pipe 10 and the discharge pipe 11 are connected to the inner wall of the pump body 1 .

[0049] By adopting the above technical solution, a feed pipe 10 is provided on the left side of the pump body 1, and a discharge pipe 11 is provided on the right side of the pump body 1. The feed pipe 10 and the discharge pipe 11 are connected to the inner wall of the pump body 1, which facilitates quick installation of the pipeline and the pump body 1 and is convenient to use.

[0050] As an embodiment of the present invention, a slider 16 is provided on the inner wall of the impeller 81, and a slide groove 17 is provided on the outer surfaces of the main shaft 6 and the secondary shaft 7. The slider 16 is adapted to the slide groove 17. The impeller 81 located on the outer surface of the main shaft 6 and the impeller 81 on the outer surface of the secondary shaft 7 are perpendicular to each other, and the outer surface of the impeller 81 is slidably connected to the inner wall of the pump body 1.

[0051] By adopting the above technical solution, by setting the slider 16 and the slide groove 17, the main shaft 6 and the secondary shaft 7 can drive the impeller 81 to rotate, and prevent the impeller 81 from sliding along the outer surface of the main shaft 6 and the secondary shaft 7 during the rotation of the main shaft 6 and the impeller 81.

[0052] As an embodiment of the present invention, the double-layer sealing ring 121 is made of wear-resistant material.

[0053] By adopting the above technical solution and setting the double-layer sealing ring 121 to be made of wear-resistant material, it is possible to prevent the double-layer sealing ring 121 from sliding along the inner wall of the primary groove 101 and being worn, thereby preventing the sealing performance of the pump body 1 from being reduced.

[0054] As an embodiment of the present invention, the inner wall of the housing 3 is flush with the inner wall of the pump body 1 , and the width of the outer surface of the end cover 12 is greater than the width of the inner wall of the housing 3 .

[0055] By adopting the above technical solution, by setting the inner wall of the shell 3 to be flush with the inner wall of the pump body 1, the width of the outer surface of the end cover 12 is greater than the width of the inner wall of the shell 3, which can limit the end cover 12.

[0056] As an embodiment of the present invention, the bellows 84 is made of elastic material.

[0057] By adopting the above technical solution and setting the bellows 84 to be made of elastic material, it is possible to prevent the bellows 84 from being deformed after being stretched for a long time or cracks from appearing on the surface of the bellows 84, thereby preventing the normal use of the pump next time.

[0058] Working principle: When the user needs to convey materials, first start the motor 5, and then drive the main shaft 6 to rotate through the output shaft of the motor 5, and then the primary gear 13 and the secondary gear 14 are meshed with each other to drive the secondary shaft 7 to rotate, and at the same time the main shaft 6 drives the primary bevel gear 15 to rotate, and then the primary bevel gear 15 drives the rotating shaft 91 to rotate by meshing with the secondary bevel gear 92, and the rotating shaft 91 drives the cam 93 to squeeze the end cover 12, and then the impellers 81 on both sides of the pump body 1 are squeezed through the end cover 12 so that the impeller 81 slides along the inner wall of the slide groove 17 to squeeze the spring 83, and then the impeller 81 in the middle of the pump body 1 is squeezed through the spring 83 to crush the material, and at the same time the bellows 84 contracts to the middle position of the two adjacent impellers 81, so as to prevent the pump from being unable to crush the material during the process of conveying the material, causing blockage inside the pump body 1, causing the pump to vibrate, and long-term operation will cause damage to the pump, thereby extending the service life of the pump.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A Roots vacuum pump, comprising a pump body (1), characterized in that: The bottom end of the pump body (1) is fixedly connected to a base (2), the interior of the pump body (1) is arranged as a hollow structure, the inner wall of the pump body (1) is provided with a crushing mechanism (8), both ends of the pump body (1) are fixedly connected to a shell (3), a side of the inner wall of the shell (3) close to the pump body (1) is provided with an extrusion mechanism (9), the other end of the shell (3) is fixedly connected to a bearing seat (4), the end of the bearing seat (4) close to the shell (3) is provided with a primary bearing groove and a secondary bearing groove, the primary bearing groove and the secondary bearing groove are symmetrically distributed on the shell (3). On both sides, the primary bearing groove is rotatably connected to a main shaft (6) through a bearing, and the secondary bearing groove is rotatably connected to a secondary shaft (7) through a bearing. The outer surface of the bearing seat (4) located on the left side of the pump body (1) is fixedly connected to a motor (5). The left end of the main shaft (6) passes through the outer surface of the bearing seat (4) and is fixedly connected to the output shaft of the motor (5). The outer surface of the main shaft (6) is fixedly connected to primary gears (13) on both sides, and the outer surface of the secondary shaft (7) is fixedly connected to secondary gears (14) on both sides, and the primary gear (13) is meshed with the secondary gear (14); The pump body (1) is provided with a primary groove (101) at both ends of the inner wall, an end cover (12) is arranged in the primary groove (101), a double-layer sealing ring (121) is fixedly connected to the outer surface of the end cover (12), the outer surface of the double-layer sealing ring (121) is slidably connected to the inner wall of the primary groove (101), the two ends of the main shaft (6) and the secondary shaft (7) pass through the outer surface of the end cover (12), and the outer surfaces of the main shaft (6) and the secondary shaft (7) are slidably connected to the inner wall of the end cover (12); The crushing mechanism (8) comprises an impeller (81), a secondary groove (82), a spring (83) and a bellows (84). A plurality of impellers (81) are provided, and the plurality of impellers (81) are respectively sleeved on the outer surfaces of the main shaft (6) and the secondary shaft (7). The two sides of the impeller (81) are provided with secondary grooves (82). A spring (83) is provided between two adjacent impellers (81). The spring (83) is sleeved on the outer surfaces of the main shaft (6) and the secondary shaft (7). The two ends of the spring (83) are respectively fixedly connected to the inner wall of the secondary groove (82). The outer surface of the spring (83) is provided with a bellows (84), and the two ends of the bellows (84) are respectively fixedly connected to the inner wall of the secondary groove (82). The extrusion mechanism (9) comprises a rotating shaft (91), a two-stage bevel gear (92) and a cam (93); the two ends of the rotating shaft (91) are rotatably connected to the inner wall of the housing (3); the outer surface of the rotating shaft (91) is fixedly connected to the cam (93) at a middle position; the outer surface of the rotating shaft (91) is fixedly connected to the two-stage bevel gear (92) at one side of the cam (93); and the outer surface of the cam (93) is slidably connected to the outer surface of the end cover (12); A primary bevel gear (15) is fixedly connected to the outer surface of the main shaft (6) and on a side close to the extrusion mechanism (9), and the primary bevel gear (15) is meshed with the secondary bevel gear (92); A feed pipe (10) is arranged on the left side of the pump body (1), and a discharge pipe (11) is arranged on the right side of the pump body (1), and the feed pipe (10) and the discharge pipe (11) are connected to the inner wall of the pump body (1); The inner wall of the impeller (81) is provided with a slider (16), the outer surfaces of the main shaft (6) and the secondary shaft (7) are provided with a slide groove (17), the slider (16) is adapted to the slide groove (17), the impeller (81) located on the outer surface of the main shaft (6) and the impeller (81) located on the outer surface of the secondary shaft (7) are perpendicular to each other, and the outer surface of the impeller (81) is slidably connected to the inner wall of the pump body (1); The output shaft of the motor (5) drives the main shaft (6) to rotate, and then the primary gear (13) and the secondary gear (14) are meshed with each other to drive the secondary shaft (7) to rotate. At the same time, the main shaft (6) drives the primary bevel gear (15) to rotate, and then the primary bevel gear (15) drives the rotating shaft (91) to rotate by meshing with the secondary bevel gear (92). The rotating shaft (91) drives the cam (93) to squeeze the end cover (12), and then the impellers (81) on both sides of the pump body (1) are squeezed through the end cover (12) so that the impellers (81) slide along the inner wall of the slide groove (17) to squeeze the spring (83), and then the impeller (81) in the middle of the pump body (1) is squeezed by the spring (83) to crush the material. At the same time, the bellows (84) shrinks to the middle position of the two adjacent impellers (81), thereby preventing the pump from being unable to crush the material during the material conveying process, causing blockage inside the pump body (1).

2. A Roots vacuum pump according to claim 1, characterized in that: The double-layer sealing ring (121) is made of wear-resistant material.

3. A Roots vacuum pump according to claim 1, characterized in that: The inner wall of the shell (3) is flush with the inner wall of the pump body (1), and the width of the outer surface of the end cover (12) is greater than the width of the inner wall of the shell (3).

4. A Roots vacuum pump according to claim 1, characterized in that: The material of the bellows (84) is elastic material.

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