CN113153744A

CN113153744A - Axial tandem type roots vacuum pump module

Info

Publication number: CN113153744A
Application number: CN202010075272.3A
Authority: CN
Inventors: 潇然; 马晓华; 潘小青
Original assignee: Elivac Inc; Elivac Co ltd
Current assignee: Elivac Inc; Elivac Co ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2021-07-23

Abstract

The invention provides an axial tandem type Roots vacuum pump module, which comprises a driving motor and a driving mechanism, wherein the driving motor comprises a left motor main shaft; each Roots vacuum pump set comprises at least one Roots vacuum pump, and the total number of the Roots vacuum pumps of all the Roots vacuum pump sets is more than or equal to two; wherein each roots vacuum pump includes a transmission shaft, and all roots vacuum pump's drive shaft forms the form of concatenating with this driving motor for this driving motor can drive all roots vacuum pump's transmission shaft simultaneously and rotate together. The invention can connect the air suction ports of all the Roots vacuum pumps in parallel to an air suction pipeline, and connect the exhaust ports of all the Roots vacuum pumps in parallel to an exhaust pipeline, so that all the Roots vacuum pumps can synchronously perform the operations of air suction, vacuum pumping and exhaust. Or the air suction ports and the exhaust ports of all the Roots vacuum pumps can be connected in series, so that the fluid can sequentially pass through all the Roots vacuum pumps to carry out multi-stage vacuum pumping operation.

Description

Axial tandem type roots vacuum pump module

Technical Field

The invention relates to a roots vacuum pump, in particular to an axial tandem type roots vacuum pump module. The structure of the invention can keep the basic performance of the original Roots vacuum pump unchanged, but can achieve the purposes of saving energy and reducing cost by sharing the same elements, and the air exhaust capacity can be greatly improved when the fluid channels are formed in parallel connection, thus being applicable to the application occasions of large-scale industries like steel plant secondary refined steel mechanical vacuum pumps, ultra-large chemical industry applications and the like.

Background

The Roots vacuum pump is a rotary variable-capacity vacuum pump, is widely applied to the fields of metallurgy, machinery, chemical industry, petroleum, light industry, food, transportation, environmental protection and the like which need vacuum systems, and has the advantages of high pumping speed, low energy consumption, simple structure, reliable work and the like. According to the conditions such as pressure difference before and after vacuum pumping, the satisfied vacuum effect can be obtained only by selecting Roots vacuum pumps with corresponding energy efficiency and the number of the Roots vacuum pumps; the larger the pressure difference is, the larger the power consumption and the air suction amount of the roots vacuum pump are required. In the past, a series of single roots vacuum pumps with different energy efficiency needs to be manufactured according to the requirements of different pressure difference conditions.

Above-mentioned prior art's vacuum pump, when need output a large amount of gas through the evacuation, often need dispose a plurality of monomer roots vacuum pumps, and every monomer roots vacuum pump all need drive through a corresponding driving motor, consequently has also improved holistic power consumption. And the cost of the whole system is increased by arranging a plurality of single roots vacuum pumps.

Therefore, the inventor of the present invention is to provide a novel modular roots vacuum pump serial structure, which can serially connect a plurality of roots vacuum pumps, and can simultaneously drive a plurality of roots vacuum pumps by a single driving motor, and the plurality of roots vacuum pumps can share the same components, thereby achieving the purpose of saving energy and reducing cost.

Disclosure of Invention

Therefore, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide an axial tandem type roots vacuum pump module, in which the driving shafts of a plurality of independent roots vacuum pumps are connected in series, so that the driving shafts of all the roots vacuum pumps are coaxially connected in series, the suction ports of all the roots vacuum pumps are connected in parallel to a suction pipe, and the exhaust ports of all the roots vacuum pumps are connected in parallel to an exhaust pipe. By adopting the structure, only one driving motor is needed to drive the driving shaft of one of the Roots vacuum pumps, so that the rotors of all the Roots vacuum pumps can be synchronously driven to rotate, and the purposes of simultaneously sucking air and vacuumizing and exhausting are achieved. Because the invention adopts the design of the Roots vacuum pump, the pump cavity volume is large, so the air suction ports of all the Roots vacuum pumps can have very high air suction quantity after being connected in parallel, the air suction speed can reach thousands to tens of thousands of cubic meters per hour, and the rotor of the invention has simple structure and is easy to maintain and clean. The transmission shafts of the Roots vacuum pumps are connected in series, and different quantities of Roots vacuum pumps can be connected in series as required, so that the overall vacuum degree and air suction quantity of the system can be adjusted. Through concatenating of the roots vacuum pump of different quantity, can form the serial-type roots vacuum pump structure of a series of different specifications, different efficiency, it can replace the monomer formula roots vacuum pump of corresponding quantity to can reach rather than the evacuation effect the same. The air suction ports and the air exhaust ports of all the Roots vacuum pumps can also be connected in series, so that the fluid can sequentially pass through all the Roots vacuum pumps to carry out multi-stage vacuum pumping operation. When the input pressure is larger or the pressure difference between the air suction port and the exhaust port of the Roots vacuum pump is larger, so that higher heat is generated, the heat exchanger can be arranged on the pipeline between the Roots vacuum pumps. Through the application of the invention, the number of the Roots vacuum pumps can be configured with high elasticity according to the actual use condition, the speed of product research and development innovative design can be accelerated, and the design workload can be reduced, for example, when 2 series Roots vacuum pumps are structurally designed, the workload can be reduced by nearly 40%, and when the series number of the Roots vacuum pumps is more, the workload can be reduced more. The invention optimizes the same series structure, saves the space occupied by the whole system, improves the production efficiency, reduces the power consumption and the cost and improves the economic benefit. The invention can form an ultra-large single-stage roots vacuum pump structure with high air exhaust capacity by the modularized design of coaxial series connection and parallel connection of exhaust gas pumping of the existing large roots vacuum pump, the vacuum exhaust capacity of the ultra-large single-stage roots vacuum pump structure is unchanged, the basic performance of the original roots vacuum pump is also unchanged, and the air exhaust capacity of the ultra-large single-stage roots vacuum pump structure can be greatly improved. Therefore, the method can be suitable for the application occasions of large-scale industries such as steel plant secondary steel refining mechanical vacuum pumps, ultra-large chemical engineering applications and the like.

In order to achieve the above object, the present invention provides an axial tandem roots vacuum pump module, which includes a driving motor including a left motor spindle; each Roots vacuum pump set comprises at least one Roots vacuum pump, and the total number of the Roots vacuum pumps of all the Roots vacuum pump sets is more than or equal to two; wherein each Roots vacuum pump comprises a transmission shaft, and the drive shafts of all the Roots vacuum pumps and the drive motor form a serial connection type.

Wherein each Roots vacuum pump comprises a pump body provided with a hollow working chamber; the transmission shaft penetrates through the pump body, and the left end and the right end of the transmission shaft are positioned on two outer sides of the pump body; an air inlet is communicated with the working chamber of the pump body; an exhaust port is communicated with the working chamber of the pump body; the two rotors are positioned in the pump body, and a certain gap is kept between the two rotors and the pump body; the two rotors are a driving rotor and a driven rotor; the driving rotor is arranged on the transmission shaft and assembled with the transmission shaft into an integral structure; a rotating shaft is positioned in the pump body, and the driven rotor is arranged on the rotating shaft; two gears are positioned in the pump body, the two gears are meshed with each other, one gear is positioned on the transmission shaft, and the other gear is positioned on the rotating shaft; and when the transmission shaft rotates, the driving rotor and the corresponding gear on the transmission shaft are driven to rotate, and meanwhile, the other gear on the rotating shaft is driven to rotate reversely, so that the rotating shaft is driven to rotate, and the driven rotor is driven to rotate reversely to the driving rotor.

Wherein the at least one Roots vacuum pump set comprises a first Roots vacuum pump set; the total number of the Roots vacuum pumps of the first Roots vacuum pump set is more than or equal to two; wherein the first Roots vacuum pump set is connected in series to the left motor spindle of the driving motor; the left motor main shaft of the driving motor, the transmission shaft of the adjacent Roots vacuum pump and the driving shafts of the two adjacent Roots vacuum pumps are connected in series through a coupling, so that the driving motor is in a series connection state.

Wherein the at least one Roots vacuum pump set comprises a first Roots vacuum pump set and a second Roots vacuum pump set; each first Roots vacuum pump set and each second Roots vacuum pump set comprise at least one Roots vacuum pump; wherein the first Roots vacuum pump set is connected in series to the left motor spindle of the driving motor; the driving motor also comprises a right motor spindle; the second Roots vacuum pump set is connected to the right motor spindle of the driving motor in series; the left or right motor main shaft of the driving motor and the transmission shaft of each adjacent Roots vacuum pump, and when the number of the Roots vacuum pumps in the same Roots vacuum pump is more than two, the driving shafts of the two adjacent Roots vacuum pumps are connected in series through a coupling, so that the Roots vacuum pumps are connected in series.

A further understanding of the nature and advantages of the present invention will become apparent from the following description when read in conjunction with the accompanying drawings.

Drawings

FIG. 1 is a schematic view of the combination of elements of the present invention.

FIG. 2 is another combination of elements of the present invention, wherein the first Roots vacuum pump set has three Roots vacuum pumps connected in series.

FIG. 3 is a schematic view of a further combination of elements of the present invention, wherein there are multiple Roots vacuum pumps in series in the first Roots vacuum pump set.

Fig. 4 is a schematic sectional view of a roots vacuum pump of the present invention.

FIG. 5 is a schematic diagram of an assembly of elements according to another embodiment of the present invention.

FIG. 6 is another combination of elements of another embodiment of the present invention, wherein there are multiple Roots vacuum pumps in series in the first and second Roots vacuum pump sets.

FIG. 7 is a schematic view of the combination of the components of all the Roots vacuum pumps in FIG. 1, in which the inlet and the outlet are connected in series.

FIG. 8 is a schematic view of the combination of all the elements of the Roots vacuum pump shown in FIG. 2, wherein the inlet and the outlet are connected in series.

FIG. 9 is a schematic view of the combination of all the elements of the Roots vacuum pump shown in FIG. 3, wherein the inlet and the outlet are connected in series.

FIG. 10 is a schematic view of the combination of all the elements of the Roots vacuum pump shown in FIG. 5, wherein the inlet and the outlet are connected in series.

FIG. 11 is a schematic view of the combination of all the elements of the Roots vacuum pump shown in FIG. 6, wherein the inlet and the outlet are connected in series.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention.

Referring to fig. 1 to 3, it is shown that the axial tandem roots vacuum pump module of the present invention provides a roots vacuum pump structure with the same series and different energy efficiency based on product modular design. This axial tandem formula roots vacuum pump module includes following component:

a drive motor 1 includes a left motor spindle 11.

At least one roots vacuum pump unit 100, each roots vacuum pump unit 100 comprises at least one roots vacuum pump 3, and the total number of the roots vacuum pumps 3 of all the roots vacuum pump units 100 is more than or equal to two. As shown in fig. 1, the at least one roots vacuum pump unit 100 comprises a first roots vacuum pump unit 101, in this case the first roots vacuum pump unit 101 comprising a plurality of roots vacuum pumps 3.

Wherein each roots vacuum pump 3 in the at least one roots vacuum pump unit 100 comprises:

a pump body 33 having a hollow working chamber 331;

an intake port 31 communicating with the working chamber 331 of the pump body 33;

an exhaust port 32 communicating with the working chamber 331 of the pump body 33;

the two rotors 34 are located in the pump body 33, and the two rotors 34 and the pump body 33 keep a certain gap. The two rotors 34 are a driving rotor 341 and a driven rotor 342. As shown in fig. 4, the driving rotor 341 and the driven rotor 342 are 8-shaped rotors.

A drive shaft 35; the transmission shaft 35 penetrates the pump body 33, and the left and right ends of the transmission shaft 35 are located on two outer sides of the pump body 33. The driving rotor 341 is mounted on the driving shaft 35 to be assembled with the driving shaft 35 in an integrated structure. The drive shaft 35 is supported on the pump body on both left and right sides using bearings 28.

A shaft 36 is located in the pump body 33, and the driven rotor 342 is mounted on the shaft 36.

Two gears 37 are located in the pump body 33, the two gears 37 are meshed with each other, one gear 37 is located on the transmission shaft 35, and the other gear 37 is located on the rotation shaft 36.

When the transmission shaft 35 rotates, the driving rotor 341 and the corresponding gear 37 on the transmission shaft 35 are driven to rotate, and at the same time, the other gear 37 on the rotation shaft 36 is driven to rotate in the opposite direction, so that the rotation shaft 36 is driven to rotate, and the driven rotor 342 is driven to rotate in the opposite direction to the driving rotor 341.

The first roots vacuum pump group 101 is connected in series to the left motor spindle 11 of the drive motor 1. Wherein the left motor spindle 11 of the driving motor 1 is serially connected to the transmission shaft 35 of the adjacent roots vacuum pump 3 through a coupling 12, and the driving shafts 35 of the two adjacent roots vacuum pumps 3 are also serially connected through a coupling 15, so that the serial connection mode is formed.

An inlet 411 is formed at one end of the suction pipe 41, a plurality of outlet 412 is formed at the other end of the suction pipe 41, each outlet 412 of the suction pipe 41 is respectively connected to the suction port 31 of a corresponding roots vacuum pump 33, that is, the suction pipe 41 is connected to the suction ports 31 of all the roots vacuum pumps 33 in the at least one roots vacuum pump group 100 through the plurality of outlet 412 thereof.

An exhaust pipe 42, one end of the exhaust pipe 42 forms a plurality of input ports 421, the other end has an output port 422, each input port 421 of the exhaust pipe 42 is respectively connected to the exhaust port 32 of a corresponding roots vacuum pump 33, i.e. the exhaust pipe 42 is connected to the exhaust ports 32 of all roots vacuum pumps 33 in the at least one roots vacuum pump group 100 through the plurality of input ports 421.

In an operating state, when the drive motor 1 drives the drive shafts 35 of the adjacent roots vacuum pumps 3 to rotate through the left motor spindle 11, the drive shafts 35 of all the roots vacuum pumps 3 in the first roots vacuum pump group 101 are synchronously driven to rotate together, so that the rotors 34 of all the roots vacuum pumps 3 rotate simultaneously, gas from the external closed system enters each roots vacuum pump 3 through the suction pipe 41, wherein along with the rotation of the rotors 34 of each roots vacuum pump 3, the volume of the part for accommodating the input gas in the working chamber 331 of each pump body 33 is reduced, and the input gas is pressed out of each vacuum pump roots 3 and is output to the exhaust pipe 42 from the exhaust port 32 of each roots vacuum pump 3 and is output to the outside from the output port 422 of the exhaust pipe 42, and the operation process is continuously repeated through the rotation of the rotors 34 of each roots vacuum pump 3, so that the system is brought into an almost vacuum state. Therefore, with the above-described structure, the suction, evacuation, and exhaust operations can be performed simultaneously in the working chambers 331 and 631 of the pump body 33 of all the roots vacuum pumps 3.

The Roots vacuum pump sets 100 can be connected with different numbers of Roots vacuum pumps 3 in series according to requirements so as to meet the use requirements. Thus, structures with different series stages can be formed. For example, fig. 1 shows a schematic view of the first roots vacuum pump group 101 comprising two roots vacuum pumps 3 connected in series, or fig. 2 shows a schematic view of the first roots vacuum pump group 101 comprising three roots vacuum pumps 3 connected in series. Alternatively, as shown in fig. 3, more roots vacuum pumps 3 may be connected in series in the first roots vacuum pump group 101, wherein each output port 412 of the suction pipe 41 is connected in parallel to the suction ports 31 of all the roots vacuum pumps 3, and each input port 421 of the exhaust pipe 42 is also connected in parallel to the exhaust ports 32 of all the roots vacuum pumps 3.

Fig. 5 and 6 show another embodiment of the present invention, in which the same elements as those in the above embodiment are denoted by the same symbols and have the same functions and connections, so that the details thereof are not repeated. The drive motor 1 in this example further comprises a right motor spindle 11'. The left motor spindle 11 and the right motor spindle 11' of the drive motor 1 can be rotated synchronously.

Wherein the at least one roots vacuum pump set 100 further comprises a second roots vacuum pump set 102. The second roots vacuum pump set 102 comprises at least one roots vacuum pump 3.

Fig. 5 shows that the first roots vacuum pump group 101 comprises a roots vacuum pump 3, and the second roots vacuum pump group 102 also comprises a roots vacuum pump 3. Wherein the left motor spindle 11 of the driving motor 1 is connected with the transmission shaft 35 of the roots vacuum pump 3 of the first roots vacuum pump set 101 through a coupler 12, and the right motor spindle 11 'of the driving motor 1 is connected with the transmission shaft 35 of the roots vacuum pump 3 of the first roots vacuum pump set 101 through another coupler 12'.

Fig. 6 shows that the first roots vacuum pump group 101 can comprise a plurality of roots vacuum pumps 3, and the second roots vacuum pump group 102 can also comprise a plurality of roots vacuum pumps 3. The first roots vacuum pump set 101 is connected in series to the left motor spindle 11 of the driving motor 1, and the connection manner is the same as that of the above embodiment, so that the description is omitted. The second roots vacuum pump set 102 is connected in series to the right motor spindle 11' of the driving motor 1 in the same manner as the first roots vacuum pump set 101.

Similarly, in the first roots vacuum pump unit 101 and the second roots vacuum pump unit 102, the suction ports 31 of all the roots vacuum pumps 3 are connected in parallel to the suction pipe 41, and the exhaust ports 32 of all the roots vacuum pumps 3 are also connected in parallel to the exhaust pipe 42.

Therefore, the driving motor 1 can synchronously drive all the roots vacuum pumps 3 of the first roots vacuum pump set 101 and the second roots vacuum pump set 102 to perform the operations of air suction, vacuum pumping and air exhaust.

In the invention, the sealing structures 2 can be respectively arranged between the driving motor 1 and the roots vacuum pump 3 connected with the driving motor, between two adjacent roots vacuum pumps 3 and at the rear end of the roots vacuum pump 3 positioned at the rearmost end, so that the driving motor 1 and the at least one roots vacuum pump set 100 are integrally formed into a closed structure.

The inlet 31 and the outlet 32 of all the roots vacuum pumps 3 in the above embodiments of the present invention may be connected in series. Fig. 7 to 11 show another embodiment of the present invention, in which the same elements as those in the above embodiments are denoted by the same symbols and have the same functions and connections, so that the details thereof are not repeated. Fig. 7 to 9 are schematic diagrams illustrating the suction ports 31 and the exhaust ports 32 of all the roots vacuum pumps 3 in the first roots vacuum pump set 101 of fig. 1 to 3 according to the above embodiments are connected in series. Fig. 10 to 11 are schematic diagrams illustrating the first roots vacuum pump set 101 and the second roots vacuum pump set 102 of the above embodiments, in which the suction ports 31 and the exhaust ports 32 of all the roots vacuum pumps 3 are connected in series.

In this embodiment, the suction pipe 41 has an input port 411 and an output port 412, and the output port 412 of the suction pipe 41 is connected to the suction port 31 of the rightmost roots vacuum pump 3. Wherein the exhaust pipe 42 has an input port 421 and an output port 422, and the input port 421 of the exhaust pipe 42 is connected to the exhaust port 32 of the leftmost roots vacuum pump 3. The exhaust port 32 and the suction port 31 of two adjacent roots vacuum pumps 3 are connected in series through a series pipe 43. Therefore, the gas from the external closed system is sequentially passed through the respective roots vacuum pumps 3 through the input port 411 of the intake pipe 41 to perform multi-stage vacuum pumping operation, and finally is output from the output port 422 of the exhaust pipe 42.

When the input pressure is large or the pressure difference between the inlet 31 and the outlet 32 of the roots vacuum pump 3 is large to generate high heat, a heat exchanger 44 may be disposed on each of the serial pipes 43 to discharge the heat in the serial pipes 43, as shown in fig. 9 and 11.

The present invention further includes auxiliary component structures (not shown) such as seal assemblies, lubrication structures, cooling structures, etc., which are configured in the system of the present invention and whose structure and function are well known in the art, and therefore, the details thereof will not be repeated herein.

Based on the concept of product modular design, the Roots vacuum pumps are divided and extracted from the structure of the traditional single Roots vacuum pump system, and a series of Roots vacuum pumps with different specifications can be formed by combining different numbers of Roots vacuum pumps so as to meet the requirements of the market on the Roots vacuum pumps with different energy efficiencies. The vacuum pumping performance of the structure of the invention is the same as that of a single Roots vacuum pump with the same energy efficiency, and the overall energy consumption is less than that of the single Roots vacuum pump with the same energy efficiency, so that the purposes of saving energy and cost can be achieved.

The structure of the invention has the following advantages:

(1) relative independence: the individual modules can be individually designed, manufactured, debugged and modified.

(2) Interchangeability: the structure, the size and the parameters of each module interface part are standardized, and the modules are easy to exchange, so that the modules can meet the requirements of Roots vacuum pumps with more different energy efficiencies.

(3) Universality: some functional modules between the same series of roots vacuum pumps can be mutually universal.

The invention has the advantages that the driving shafts of a plurality of independent Roots vacuum pumps are mutually connected in series, so that the driving shafts of all the Roots vacuum pumps form a coaxial series connection type, the air suction ports of all the Roots vacuum pumps are connected in parallel to an air suction pipeline, and the air exhaust ports of all the Roots vacuum pumps are connected in parallel to an air exhaust pipeline. By adopting the structure, only one driving motor is needed to drive the driving shaft of one of the Roots vacuum pumps, so that the rotors of all the Roots vacuum pumps can be synchronously driven to rotate, and the purposes of simultaneously sucking air and vacuumizing and exhausting are achieved. Because the invention adopts the design of the Roots vacuum pump, the pump cavity volume is large, so the suction ports of all the Roots vacuum pumps can have very high air extraction quantity after being connected in parallel, the air extraction speed can reach thousands to tens of thousands of cubic meters per hour, and the rotor of the invention has simple structure and is easy to maintain and clean. The transmission shafts of the Roots vacuum pumps are connected in series, different numbers of Roots vacuum pumps can be connected in series according to requirements, and the overall vacuum degree and air extraction amount of the system can be adjusted. Through concatenating of the roots vacuum pump of different quantity, can form the serial-type roots vacuum pump structure of a series of different specifications, different efficiency, it can replace the monomer formula roots vacuum pump of corresponding quantity to can reach rather than the evacuation effect the same. The air suction ports and the air exhaust ports of all the Roots vacuum pumps can also be connected in series, so that the fluid can sequentially pass through all the Roots vacuum pumps to carry out multi-stage vacuum pumping operation. When the input pressure is larger or the pressure difference between the air suction port and the exhaust port of the Roots vacuum pump is larger, so that higher heat is generated, the heat exchanger can be arranged on the pipeline between the Roots vacuum pumps. Through the application of the invention, the number of the Roots vacuum pumps can be configured with high elasticity according to the actual use condition, the speed of product research and development innovative design can be accelerated, and the design workload can be reduced, for example, when 2 series Roots vacuum pumps are structurally designed, the workload can be reduced by nearly 40%, and when the series number of the Roots vacuum pumps is more, the workload can be reduced more. The invention optimizes the same series structure, saves the space occupied by the whole system, improves the production efficiency, reduces the power consumption and the cost and improves the economic benefit. The invention can form an ultra-large single-stage Roots vacuum pump structure with high air exhaust capacity by the modular design of connecting the driving shafts in series and connecting the exhaust ports in parallel, the vacuum exhaust capacity is unchanged, the basic performance of the original Roots vacuum pump is also unchanged, and the air exhaust capacity can be greatly improved. Therefore, the method can be suitable for the application occasions of large-scale industries such as steel plant secondary steel refining mechanical vacuum pumps, ultra-large chemical engineering applications and the like.

The above detailed description is specific to a possible embodiment of the present invention, which is not intended to limit the scope of the invention, but rather the scope of the invention is to be defined by the appended claims.

Claims

1. The utility model provides an axial tandem formula roots vacuum pump module which characterized in that includes:

a drive motor including a left motor spindle; and

each Roots vacuum pump set comprises at least one Roots vacuum pump, and the total number of the Roots vacuum pumps of all the Roots vacuum pump sets is more than or equal to two; wherein each Roots vacuum pump comprises a transmission shaft, and the drive shafts of all the Roots vacuum pumps and the drive motor form a serial connection type.

2. An axial tandem roots vacuum pump module as set forth in claim 1, wherein each roots vacuum pump comprises:

a pump body having a hollow working chamber; the transmission shaft penetrates through the pump body, and the left end and the right end of the transmission shaft are positioned on two outer sides of the pump body;

an air suction port communicated with the working chamber of the pump body;

an exhaust port communicated with the working chamber of the pump body;

the two rotors are positioned in the pump body, and a certain gap is kept between the two rotors and the pump body; the two rotors are a driving rotor and a driven rotor; the driving rotor is arranged on the transmission shaft and assembled with the transmission shaft into an integral structure;

the rotating shaft is positioned in the pump body, and the driven rotor is arranged on the rotating shaft;

two gears which are positioned in the pump body and are meshed with each other, wherein one gear is positioned on the transmission shaft, and the other gear is positioned on the rotating shaft; and

when the transmission shaft rotates, the driving rotor and the corresponding gear on the transmission shaft are driven to rotate, and meanwhile, the other gear on the rotating shaft is driven to rotate in the reverse direction, so that the rotating shaft is driven to rotate, and the driven rotor is driven to rotate in the reverse direction of the driving rotor.

3. The axial tandem roots vacuum pump module of claim 1 or 2, wherein the at least one roots vacuum pump set comprises a first roots vacuum pump set; the total number of the Roots vacuum pumps of the first Roots vacuum pump set is more than or equal to two;

wherein the first Roots vacuum pump set is connected in series to the left motor spindle of the driving motor; the left motor main shaft of the driving motor, the transmission shaft of the adjacent Roots vacuum pump and the driving shafts of the two adjacent Roots vacuum pumps are connected in series through a coupling, so that the driving motor is in a series connection state.

4. The axial tandem roots vacuum pump module as claimed in claim 1 or 2, wherein the at least one roots vacuum pump set comprises a first roots vacuum pump set and a second roots vacuum pump set; each first Roots vacuum pump set and each second Roots vacuum pump set comprise at least one Roots vacuum pump; the driving motor also comprises a right motor spindle;

wherein the first Roots vacuum pump set is connected in series to the left motor spindle of the driving motor; the second Roots vacuum pump set is connected to the right motor spindle of the driving motor in series; the left or right motor main shaft of the driving motor and the transmission shaft of each adjacent Roots vacuum pump, and when the number of the Roots vacuum pumps in the same Roots vacuum pump is more than two, the driving shafts of the two adjacent Roots vacuum pumps are connected in series through a coupling, so that the Roots vacuum pumps are connected in series.

5. An axial tandem roots vacuum pump module as claimed in claim 2, wherein the suction port of each roots vacuum pump is connected in parallel to a suction conduit and the exhaust port of each roots vacuum pump is connected in parallel to an exhaust conduit.

6. An axial tandem roots vacuum pump module as claimed in claim 2, wherein the driving and driven rotors of each roots vacuum pump are 8-shaped rotors.

7. The axial tandem roots vacuum pump module as claimed in claim 1, wherein sealing structures are respectively provided between the driving motor and the roots vacuum pump connected thereto, between two adjacent roots vacuum pumps, and at the rear end of the rearmost roots vacuum pump, so that the driving motor and the at least one roots vacuum pump set are integrally formed in a hermetically sealed structure.

8. The axial tandem roots vacuum pump module as claimed in claim 2, wherein the air inlet and the air outlet of all roots vacuum pumps are connected in series; the air suction port of the rightmost roots vacuum pump is connected with an air suction pipeline, the exhaust port of the leftmost roots vacuum pump is connected with an exhaust pipeline, and the corresponding exhaust ports and the air suction ports of the two adjacent roots vacuum pumps are connected in series through a series of connecting pipelines.

9. An axial tandem roots vacuum pump module according to claim 8, wherein a heat exchanger is provided on each tandem conduit for removing heat from the tandem conduit.