Energy-saving efficient vacuum roots pump

Abstract

The invention discloses an energy-saving efficient vacuum roots pump, and relates to the application field of roots pumps of industrial boilers, the roots pump comprises an air inlet and an air outlet, the air inlet of the roots pump is provided with a first-stage filtering mechanism, the top of the first-stage filtering mechanism is provided with a second-stage filtering mechanism, and the second-stage filtering mechanism is provided with a second-stage filtering mechanism. And the secondary filtering mechanism comprises a second main pipeline, a second outer convex ring is arranged on the side face of the second main pipeline, the second main pipeline is sleeved with a sealing sleeve, the bottom of the sealing sleeve is in threaded connection with a second connecting base, and a coarse filtering assembly is movably installed at the top of the second connecting base. Impurities in air are effectively and coarsely filtered by arranging the second-stage filtering mechanism, and the air can be further filtered by arranging the first-stage filtering mechanism, so that abrasion of key parts such as a rotor and a sealing piece of the roots pump is reduced, and the pump body efficiently and stably runs for a long time.

Description

Technical Field

[0001] The invention relates to the application field of Roots pumps for industrial boilers, in particular to an energy-saving and high-efficiency vacuum Roots pump. Background Art

[0002] An industrial boiler is a device used for heating, steam generation, and heating in industrial production. Its main function is to heat water to a certain temperature to generate steam or hot water by burning fuel (such as coal, natural gas, oil, etc.) or utilizing other energy sources. The steam or hot water is used to drive machinery, provide thermal energy, or perform other heat treatment processes. In actual applications, the flue gas produced by combustion has a relatively high temperature. Boilers that effectively utilize the exhaust flue gas can save a lot of energy. For example, high-temperature flue gas can be used to heat the domestic water for workers, high-temperature flue gas can be used to preheat the air involved in boiler combustion, and flue gas waste heat can be used to generate electricity.

[0003] Traditional boilers usually use centrifugal fans or other types of fans to transport air, while some efficient forced-draft boilers usually use Roots pumps for air transportation. Roots pumps, also known as Roots blowers or Roots vacuum pumps, are mechanical equipment that compresses or extracts gas through the relative movement between two rotors. It is based on two "8"-shaped rotors, which inhale and exhaust gas by mutual meshing during rotation. It is mainly used in the fields of gas pressurization, transportation and exhaust. It can quickly extract a large amount of gas, so it is often used in situations requiring high flow. Using Roots pumps in forced-draft boilers can significantly improve combustion efficiency.

[0004] The reuse of boiler flue gas can not only improve energy efficiency and reduce energy consumption, but also effectively reduce environmental pollution, which meets the requirements of energy conservation and emission reduction. Energy-saving forced air supply boilers are usually used in combination with air preheaters and Roots pumps. Roots pumps suck and transport external air to the air preheater. The air preheater uses the flue gas of the boiler to preheat the air. The preheated air participates in the combustion of the boiler, which can improve the combustion efficiency and reduce energy consumption to achieve the purpose of energy saving. In actual applications, as the use time of Roots pumps goes by, the air inlet of the pump will be blocked by foreign matter, making the gas flow unsmooth, and the rotor will increase wear due to the attachment of foreign matter. This causes the actual power value of gas delivery of Roots pumps to gradually decrease under the same motor input power. Due to the large gas consumption of forced draft boilers, Roots pumps gradually experience insufficient gas supply, which not only affects the combustion of the boiler, but also causes the Roots pump to overload in order to ensure that the actual power remains unchanged. Long-term high-load operation of the pump body will cause the boiler equipment to shut down, and the interruption of boiler combustion will waste more energy and increase the maintenance cost of the pump body. Therefore, the efficient and stable operation of Roots pumps can not only reduce maintenance costs, but also ensure continuous energy saving of boilers. Roots pumps themselves also have energy-saving effects. The normal operation of key components such as rotors, bearings, and seals can also effectively preheat the air. Because when the Roots pump is working, gas is sucked in from the inlet of the pump, and then the gap of the rotor meshing compresses the gas to the outlet. The compression process will increase the temperature of the air, further saving energy for the boiler. Summary of the invention

[0005] Based on this, the object of the present invention is to provide an energy-saving and high-efficiency vacuum Roots pump to solve the technical problems mentioned in the above background.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an energy-saving and high-efficiency vacuum Roots pump includes a Roots pump, the Roots pump includes an air inlet and an exhaust port, and the air inlet of the Roots pump is installed with a primary filter mechanism, and the top of the primary filter mechanism is installed with a secondary filter mechanism, the secondary filter mechanism includes a second main pipe, and the side of the second main pipe is provided with a second outer convex ring, and the outer part of the second main pipe is sleeved with a sealing sleeve, the bottom of the sealing sleeve is threadedly connected with a second connecting seat, and a coarse filter component is movably installed on the top of the second connecting seat, an annular groove is provided inside the second main pipe and a spring is installed, and a movable frame for squeezing the coarse filter component is sleeved in the annular groove.

[0007] By adopting the above technical scheme, the secondary filtering mechanism effectively performs coarse filtering on impurities in the air, thereby reducing the wear of key components such as the Roots pump rotor and seals, allowing the pump body to operate efficiently and stably for a long time. An arched screen is arranged to filter large particles such as dust. Compared with the traditional flat screen, the arched screen has the function of automatic dust cleaning. The attached dust will slide down the side, thereby extending the time of efficient filtration of the secondary filtering mechanism and reducing the number of regular maintenance of the secondary filtering mechanism. A spoiler fan is arranged on the top of the arched screen. The spoiler fan uses the pipeline intake pressure to automatically drive its rotation, which is used to entangle flocs floating in the air, and the air will be dispersed when passing through the spoiler fan, further driving the dust to concentrate on the side of the arched screen.

[0008] The present invention is further configured such that the coarse filtration assembly includes a base, and a plurality of through holes are provided on the side of the base, and an engaging ring is provided at the bottom of the base, a second inclined guide surface is provided on the inner edge of the base, and an arched screen is provided on the top of the base, a spoiler fan is installed on the inner side of the base by means of a bracket, the spoiler fan and the bracket are rotatably connected, and the spoiler fan is located above the arched screen.

[0009] Preferably, by setting up a coarse filter component, larger particles in the air can be initially filtered, and the arched screen of the coarse filter component has the characteristics of an arched structure. When the dust adheres to a certain amount, it will slide to the side edge of the arched screen, which can not only collect dust, but also has a longer service life than traditional flat screens.

[0010] The present invention is further configured such that a first oblique guide surface is provided at the bottom edge of the second connecting seat, and the first oblique guide surface is connected to the second oblique guide surface, and an engaging groove matching the engaging ring is provided at the top of the second connecting seat.

[0011] Preferably, the first oblique guide surface and the second oblique guide surface are arranged to be obliquely connected, so that the dust accumulated on the arched screen will slide to the second oblique guide surface, and then pass through the through hole and accumulate at the position of the first oblique guide surface.

[0012] The present invention is further configured such that a second sealing ring is provided on the top of the second outer convex ring, and the second sealing ring is used to improve the sealing performance between the sealing sleeve and the outer wall of the second main pipeline.

[0013] Preferably, by providing a second outer convex ring and a second sealing ring, the sealing between the sealing sleeve and the outer wall of the second main pipe can be improved, thereby reducing the risk of air leakage.

[0014] The present invention is further configured such that an external air intake pipe is connected to the top of the second main pipe, and the external air intake pipe is used to guide outdoor air into the second main pipe.

[0015] Preferably, since industrial boilers are usually dusty when in use, an external air intake pipe is provided to connect to the second main pipe, so that cleaner outdoor air can be transported to the industrial boiler using a Roots pump. Transporting cleaner air can increase the service life of the Roots pump.

[0016] The present invention is further configured such that the first-stage filtering mechanism includes a first main pipeline connected to a second connecting seat, and a first outer convex ring is arranged on the outside of the first main pipeline, and a first sealing ring is arranged on the top of the first outer convex ring, a protective cover is arranged on the outside of the first main pipeline, and a first connecting seat is arranged on the bottom of the protective cover, and the bottom of the first connecting seat is connected to the air inlet of the Roots pump.

[0017] Preferably, a primary filter mechanism is provided to effectively filter fine impurities in the air. The combination of the primary filter mechanism and the secondary filter mechanism can extend the service life of the air filter of the primary filter mechanism and reduce the replacement frequency of the air filter, which can not only reduce the cost of consumables but also reduce the occurrence of boiler shutdown due to replacement of air filters. The guide cover in the primary filter mechanism interferes with the flow of air, allowing the air to contact the air filter more evenly, thereby avoiding local reduction in the filtering effect of the air filter.

[0018] The present invention is further configured such that a mounting seat is movably mounted on the top of the first connecting seat, a ventilation tube is arranged on the top of the mounting seat, and an air filter is arranged on the outside of the ventilation tube.

[0019] Preferably, an air filter is provided to filter the air more finely, thereby reducing the wear of the interior of the Roots pump caused by impurities.

[0020] The present invention is further configured such that an extension column is provided at the bottom of the air permeable tube, a guide cover is sleeved on the outside of the extension column, and a knob for tightening the guide cover is threadedly connected to the top of the extension column.

[0021] Preferably, by providing a guide cover plate, the air entering the primary filter mechanism can be more evenly distributed around the air filter, thereby avoiding the situation where a large number of impurities are locally attached to the air filter.

[0022] The present invention is further configured such that a primary filtering mechanism is provided at the air inlet of the Roots pump, and a first three-way pipe is provided at the top of the primary filtering mechanism, and a first valve is provided on the side of the first three-way pipe, two groups of secondary filtering mechanisms are provided at the top of the primary filtering mechanism, and a second three-way pipe is provided at the top of the two groups of secondary filtering mechanisms, and a second valve is provided on the side of the second three-way pipe, and the top of the second three-way pipe is connected to an external air intake pipe.

[0023] Preferably, two sets of secondary filtering mechanisms can be used alternately. In daily work, only one set of secondary filtering mechanisms of the Roots pump needs to be started. When cleaning and maintenance are required, the two sets of secondary filtering mechanisms can be switched by turning the first valve and the second valve, thereby ensuring that the boiler and the Roots pump work without stopping.

[0024] In summary, the present invention mainly has the following beneficial effects: The present invention provides a secondary filtering mechanism to effectively perform coarse filtering on impurities in the air, thereby reducing the wear of key components such as the Roots pump rotor and seals, allowing the pump body to operate efficiently and stably for a long time, and providing an arched screen to filter large particles such as dust. The arched screen has an automatic dust cleaning function compared to the traditional flat screen, and the attached dust will slide down the side, thereby extending the efficient filtration time of the secondary filtering mechanism and reducing the number of regular maintenance times of the secondary filtering mechanism. A spoiler fan is provided on the top of the arched screen, and the spoiler fan uses the pipeline intake pressure to automatically drive its rotation, and is used to entangle flocs floating in the air. The air will be dispersed when passing through the spoiler fan, further driving the dust to concentrate on the side of the arched screen.

[0025] The present invention effectively filters fine impurities in the air by setting a primary filtering mechanism. The combined use of the primary filtering mechanism and the secondary filtering mechanism can extend the service life of the air filter of the primary filtering mechanism and reduce the replacement frequency of the air filter, which can not only reduce the cost of consumables but also reduce the occurrence of boiler shutdown due to replacement of the air filter. The guide cover plate in the primary filtering mechanism has an interference effect on the flow of air, so that the air can contact the air filter more evenly, avoiding the local reduction of the filtering effect of the air filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention; Figure 2 It is a structural schematic diagram of a Roots pump of the present invention; Figure 3 It is a structural schematic diagram of the primary filtering mechanism of the present invention; Figure 4 It is a schematic diagram of the internal structure of the primary filtering mechanism of the present invention; Figure 5 It is a schematic diagram of the structure of the first connecting socket of the present invention; Figure 6 It is a schematic diagram of the installation of the mounting seat, the air guide cover, the air filter and the knob of the present invention; Figure 7 It is a schematic diagram of the installation of the mounting base, the vent pipe, the extension column and the knob of the present invention; Figure 8 It is a schematic diagram of the structure of the secondary filtering mechanism of the present invention; Fig. 9 It is a schematic diagram of the internal structure of the secondary filtering mechanism of the present invention; Fig.10 This is a schematic diagram of the installation of the second main pipeline, spring and movable frame of the present invention; Fig.11 It is a schematic diagram of the structure of the second connecting socket of the present invention; Fig.12It is a schematic diagram of the structure of the coarse filtration component of the present invention; Fig.13 It is a schematic diagram of the distribution of the arched screen and the spoiler fan of the present invention; Fig.14 It is a schematic diagram of the overall structure of the second embodiment of the present invention.

[0027] Description of reference numerals: 1. Roots pump; 2. Primary filtering mechanism; 201. First main pipeline; 202. First outer convex ring; 203. First sealing ring; 204. Protective cover; 205. First connecting seat; 206. Mounting seat; 207. Air pipe; 208. Extension column; 209. Knob; 210. Guide cover; 211. Air filter; 3. Secondary filtering mechanism; 301. Second main pipeline; 302. Second outer convex ring; 303. Second sealing ring; 304. Sealing sleeve Tube; 305, second connecting seat; 306, first inclined guide surface; 307, fitting groove; 308, coarse filter assembly; 3081, base; 3082, through hole; 3083, second inclined guide surface; 3084, arched screen; 3085, fitting ring; 3086, bracket; 3087, spoiler fan; 309, spring; 310, movable frame; 4, external air intake duct; 5, first three-way pipe; 6, first valve; 7, second three-way pipe; 8, second valve. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] The following describes an embodiment of the present invention based on its overall structure. Embodiment 1

[0030] See also Figure 1 - Fig.13The invention discloses an energy-saving and high-efficiency vacuum Roots pump, comprising a Roots pump 1, wherein the Roots pump 1 comprises an air inlet and an air outlet, the Roots pump 1 is driven by a high-power motor, and a primary filtering mechanism 2 is installed at the air inlet of the Roots pump 1, and a secondary filtering mechanism 3 is installed at the top of the primary filtering mechanism 2, the secondary filtering mechanism 3 comprises a second main pipeline 301, and a second outer convex ring 302 is arranged on the side of the second main pipeline 301, and a sealing sleeve 304 is sleeved on the outside of the second main pipeline 301, a second connecting seat 305 is threadedly connected to the bottom of the sealing sleeve 304, and a coarse filtering component 308 is movably installed on the top of the second connecting seat 305, an annular groove is provided inside the second main pipeline 301, and a spring 309 is installed, and a movable frame 310 for squeezing the coarse filtering component 308 is sleeved in the annular groove, and impurities in the air are effectively coarsely filtered by arranging the secondary filtering mechanism 3, thereby reducing the wear of key components such as the rotor and the seal of the Roots pump 1, so that the pump body can operate efficiently and stably for a long time.

[0031] In the above embodiments, please refer to Fig.12 and Fig.13 The coarse filter assembly 308 includes a base 3081, and a plurality of through holes 3082 are provided on the side of the base 3081, and a fitting ring 3085 is provided at the bottom of the base 3081, a second inclined guide surface 3083 is provided on the inner edge of the base 3081, and an arched screen 3084 is provided on the top of the base 3081, and a spoiler fan 3087 is installed on the inner side of the base 3081 by setting a bracket 3086, the spoiler fan 3087 and the bracket 3086 are rotatably connected, and the spoiler fan 3087 is located above the arched screen 3084, and the coarse filter assembly 308 can be preliminarily filtered for larger particles in the air, and the arched screen 3084 of the coarse filter assembly 308 has an arched structure. When dust adheres to a certain amount, it will slide to the side edge of the arched screen 3084, which can not only gather dust, but also has a longer service life than traditional flat screens.

[0032] In the above embodiments, please refer to Fig. 9 - Fig.11 A first oblique guide surface 306 is provided at the bottom edge of the second connecting seat 305, and the first oblique guide surface 306 is connected to the second oblique guide surface 3083, and a fitting groove 307 matching the fitting ring 3085 is provided on the top of the second connecting seat 305. By setting the first oblique guide surface 306 and the second oblique guide surface 3083 to be beveled, the dust gathered on the arched screen 3084 will slide to the second oblique guide surface 3083, and then pass through the through hole 3082 to gather at the position of the first oblique guide surface 306.

[0033] In the above embodiments, please refer to Fig. 9A second sealing ring 303 is arranged on the top of the second outer convex ring 302. The second sealing ring 303 is used to improve the sealing between the sealing sleeve 304 and the outer wall of the second main pipe 301. By arranging the second outer convex ring 302 and the second sealing ring 303, the sealing between the sealing sleeve 304 and the outer wall of the second main pipe 301 can be improved, and the risk of air leakage can be reduced.

[0034] In the above embodiments, please refer to Figure 1 The top of the second main pipeline 301 is connected with an external air intake pipeline 4, which is used to guide outdoor air into the second main pipeline 301. Since industrial boilers are usually dusty when in use, an external air intake pipeline 4 is provided to connect the second main pipeline 301, so that cleaner outdoor air can be transported to the industrial boiler using the Roots pump 1. Transporting cleaner air can increase the service life of the Roots pump 1.

[0035] In the above embodiments, please refer to Figure 3 and Figure 4 The primary filter mechanism 2 includes a first main pipe 201 connected to a second connecting seat 305, and a first outer convex ring 202 is arranged on the outside of the first main pipe 201, and a first sealing ring 203 is arranged on the top of the first outer convex ring 202, and a protective cover 204 is sleeved on the outside of the first main pipe 201, and a first connecting seat 205 is arranged on the bottom of the protective cover 204, and the bottom of the first connecting seat 205 is connected to the air inlet of the Roots pump 1. By setting the primary filter mechanism 2, fine impurities in the air are effectively filtered. The combination of the primary filter mechanism 2 and the secondary filter mechanism 3 can extend the service life of the air filter 211 of the primary filter mechanism 2 and reduce the replacement frequency of the air filter 211, which can not only reduce the cost of consumables, but also reduce the shutdown of the boiler due to the replacement of the air filter 211. The guide cover 210 in the primary filter mechanism 2 has an interference effect on the flow of air, so that the air can contact the air filter 211 more evenly, avoiding the local reduction of the filtering effect of the air filter 211.

[0036] In the above embodiments, please refer to Figure 5 and Figure 6 A mounting seat 206 is movably mounted on the top of the first connecting seat 205, and a ventilation tube 207 is arranged on the top of the mounting seat 206, and an air filter 211 is arranged on the outside of the ventilation tube 207. By arranging the air filter 211, the air can be filtered more finely to reduce the wear of the inside of the Roots pump 1 caused by impurities.

[0037] In the above embodiments, please refer to Figure 7An extension column 208 is provided at the bottom of the air vent 207, and a guide cover 210 is provided on the outside of the extension column 208, and a knob 209 for pressing the guide cover 210 is threadedly connected to the top of the extension column 208. By providing the guide cover 210, the air entering the primary filter mechanism 2 can be more evenly distributed around the air filter 211, thereby avoiding the situation where a large number of impurities are locally attached to the air filter 211. Embodiment 2

[0038] See also Fig.14 A primary filtering mechanism 2 is provided at the air inlet of the Roots pump 1, and a first three-way pipe 5 is provided on the top of the primary filtering mechanism 2, and a first valve 6 is provided on the side of the first three-way pipe 5, two groups of secondary filtering mechanisms 3 are provided on the top of the primary filtering mechanism 2, and second three-way pipes 7 are provided on the top of the two groups of secondary filtering mechanisms 3, and a second valve 8 is provided on the side of the second three-way pipe 7, and the top of the second three-way pipe 7 is connected to an external air intake pipe 4. By setting two groups of secondary filtering mechanisms 3, they can be used alternately. In daily work, only one group of secondary filtering mechanisms 3 of the Roots pump 1 is started. When cleaning and maintenance are required, the two groups of secondary filtering mechanisms 3 can be switched by turning the first valve 6 and the second valve 8, which can ensure that the boiler and the Roots pump 1 work without stopping.

[0039] The present invention is in specific operation: in Example 1, the drive device is started to drive the Roots pump 1 to work, and air enters the second main pipe 301 from the external air intake pipe 4. The high-speed flowing air will drive the spoiler fan 3087 to rotate. When the spoiler fan 3087 rotates, it will actively entangle the flocculent floating objects in the air, and the rotation of the spoiler fan 3087 will interfere with the flowing air, so that the air passes through the arched screen 3084 in a diffused form. Some larger dust particles in the air are blocked by the arched screen 3084. After a certain amount of dust attached to the surface of the arched screen 3084 accumulates, it slowly slides to the second inclined guide surface 3083, and then slides from the through hole 3082 to the first inclined guide surface 306 and is blocked by the inner wall of the sealing sleeve 304.

[0040] Next, the air passes through the second connecting seat 305 and enters the interior of the first main pipe 201. At this time, the air hits the top of the first main pipe 201 at a certain flow rate, causing the air to diffuse to the surrounding space of the air filter 211. The air passes through the surface of the air filter 211, and most of the particulate impurities are blocked by the air filter 211. The filtered air enters the first connecting seat 205 from the air vent 207 and then enters the air inlet of the Roots pump 1.

[0041] When it is necessary to clean the dust and impurities accumulated in the secondary filter mechanism 3, use a wrench or other tool to rotate the sealing sleeve 304 to open it, and then clean the dust accumulated on the first inclined guide surface 306. You can also push the movable frame 310 upwards, and then take out the coarse filter assembly 308 for cleaning. For maintenance and replacement of the air filter 211, it is necessary to disassemble the first connecting seat 205 and the protective cover 204, loosen the knob 209 to remove the guide cover 210, and then maintain the air filter 211.

[0042] In the second embodiment, the principle is basically the same as that of the first embodiment. During daily operation of the Roots pump 1, only one group of the secondary filtering mechanisms 3 needs to be started. When the used secondary filtering mechanisms 3 need to be cleaned, the pipeline where the other group of secondary filtering mechanisms 3 is located can be opened by turning the second valve 8 and the first valve 6. The used secondary filtering mechanisms 3 can be cleaned in the manner described in the first embodiment. The two groups of secondary filtering mechanisms 3 can be used alternately by controlling the first valve 6 and the second valve 8 to ensure that the operation of the boiler will not be interrupted.

[0043] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An energy-saving and high-efficiency vacuum Roots pump, comprising a Roots pump (1), characterized in that: The Roots pump (1) comprises an air inlet and an air outlet, and the air inlet of the Roots pump (1) is equipped with a primary filter mechanism (2), and a secondary filter mechanism (3) is installed on the top of the primary filter mechanism (2), the secondary filter mechanism (3) comprises a second main pipe (301), and a second outer convex ring (302) is arranged on the side of the second main pipe (301), and a sealing sleeve (304) is sleeved on the outside of the second main pipe (301), a second connecting seat (305) is threadedly connected to the bottom of the sealing sleeve (304), and a coarse filter assembly (308) is movably installed on the top of the second connecting seat (305), and an annular groove is provided inside the second main pipe (301) and a spring (309) is installed, and a movable frame (310) for squeezing the coarse filter assembly (308) is sleeved in the annular groove.

2. The energy-saving and high-efficiency vacuum Roots pump according to claim 1, characterized in that: The coarse filtering assembly (308) comprises a base (3081), and a plurality of through holes (3082) are provided on the side of the base (3081), and a fitting ring (3085) is provided at the bottom of the base (3081), a second inclined guide surface (3083) is provided at the inner edge of the base (3081), and an arched screen (3084) is provided at the top of the base (3081), and a spoiler fan (3087) is installed on the inner side of the base (3081) by means of a bracket (3086), the spoiler fan (3087) and the bracket (3086) are rotatably connected, and the spoiler fan (3087) is located above the arched screen (3084).

3. The energy-saving and high-efficiency vacuum Roots pump according to claim 2, characterized in that: A first oblique guide surface (306) is provided at the bottom edge of the second connecting seat (305), and the first oblique guide surface (306) is connected to the second oblique guide surface (3083), and a fitting groove (307) matching the fitting ring (3085) is provided at the top of the second connecting seat (305).

4. The energy-saving and high-efficiency vacuum Roots pump according to claim 3 is characterized in that: A second sealing ring (303) is provided on the top of the second outer convex ring (302), and the second sealing ring (303) is used to improve the sealing performance between the sealing sleeve (304) and the outer wall of the second main pipeline (301).

5. The energy-saving and high-efficiency vacuum Roots pump according to claim 4 is characterized in that: The top of the second main pipeline (301) is connected to an external air intake pipeline (4), and the external air intake pipeline (4) is used to guide outdoor air into the second main pipeline (301).

6. The energy-saving and high-efficiency vacuum Roots pump according to claim 1, characterized in that: The primary filtering mechanism (2) comprises a first main pipeline (201) connected to a second connecting seat (305), a first outer convex ring (202) is arranged outside the first main pipeline (201), and a first sealing ring (203) is arranged on the top of the first outer convex ring (202), a protective cover (204) is sleeved outside the first main pipeline (201), and a first connecting seat (205) is arranged at the bottom of the protective cover (204), and the bottom of the first connecting seat (205) is connected to the air inlet of the Roots pump (1).

7. The energy-saving and high-efficiency vacuum Roots pump according to claim 6, characterized in that: A mounting seat (206) is movably mounted on the top of the first connecting seat (205), a ventilation tube (207) is arranged on the top of the mounting seat (206), and an air filter (211) is arranged on the outside of the ventilation tube (207).

8. The energy-saving and high-efficiency vacuum Roots pump according to claim 7, characterized in that: An extension column (208) is provided at the bottom of the air permeable tube (207), a flow guide cover plate (210) is sleeved on the outside of the extension column (208), and a knob (209) for pressing the flow guide cover plate (210) is threadedly connected to the top of the extension column (208).

9. The energy-saving and high-efficiency vacuum Roots pump according to claim 8, characterized in that: The air inlet of the Roots pump (1) is provided with a primary filter mechanism (2), and a first three-way pipe (5) is provided on the top of the primary filter mechanism (2), and a first valve (6) is provided on the side of the first three-way pipe (5), and two groups of secondary filter mechanisms (3) are provided on the top of the primary filter mechanism (2), and a second three-way pipe (7) is provided on the top of the two groups of secondary filter mechanisms (3), and a second valve (8) is provided on the side of the second three-way pipe (7), and the top of the second three-way pipe (7) is connected to an external air inlet pipeline (4).

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