Single-motor double-drive roots vacuum pump

Abstract

The utility model relates to the technical field of vacuum pumps, in particular to a single-motor double-drive roots vacuum pump. Comprising a pump body and a motor fixedly connected to the pump body, and further comprises a packaging assembly arranged between the pump body and the motor, two sets of transmission shafts are arranged in the pump body, a valve set is arranged on one side of the pump body, the pump body is sealed through the valve set, and redundant gas in the pump body is exhausted outwards. The single-motor double-drive roots vacuum pump has the advantages of being good in sealing performance, good in air exhaust effect, high in working efficiency, simple in structure, convenient to disassemble and assemble and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, in particular to a single-motor dual-drive Roots vacuum pump. Background Art

[0002] Roots vacuum pump (abbreviated as: Roots pump) refers to a variable displacement vacuum pump that is equipped with two leaf-shaped rotors rotating synchronously in opposite directions, with a small gap between the rotors and between the rotors and the inner wall of the pump casing, and they do not contact each other.

[0003] Chinese patent CN204061176U discloses a Roots vacuum pump, which solves the technical problems of the existing Roots vacuum pumps such as complex structure and inconvenient maintenance. It includes a pump body, a main shaft, a shielded motor and a sealing flange, one end of the main shaft passes through the pump body, the housing of the shielded motor is fixed on the pump body, the end of the main shaft passing through the pump body passes through the shielded motor and is fixed to the rotor of the shielded motor, the end of the shielding cover of the shielded motor is fixed to the sealing flange, the sealing flange is fixed to the pump body, and a sealing ring is provided between the sealing flange and the pump body. The Roots vacuum pump has the advantages of simplifying the structure of the Roots vacuum pump and facilitating the maintenance and care of the Roots vacuum pump.

[0004] However, since this technical solution has no structure to protect the inner wall of the pump body, the pump body will be corroded with long-term use, which will shorten the service life of the pump body and require regular maintenance or replacement. It is inconvenient to operate and has high cost. In addition, the vacuum pump has poor sealing performance, which will result in poor vacuum pumping effect and low working efficiency. It is also not sensitive enough to dust and water vapor in the pumped gas, has low compression ratio, and is inconvenient to use. Utility Model Content

[0005] The purpose of the utility model is to provide a single-motor dual-drive Roots vacuum pump in response to the deficiencies of the prior art, which dilutes the air in the pump body through a valve group and discharges it to the outside to achieve the function of slowing down the corrosion rate of the pump body, thereby solving the problem of the prior art that there is no structure to protect the inner wall of the pump body, resulting in a shortened service life of the pump body and low working efficiency.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A single-motor dual-drive Roots vacuum pump comprises: a pump body and a motor fixedly connected to the pump body, and also comprises: a packaging component arranged between the pump body and the motor, two groups of transmission shafts are arranged in the pump body, and a valve group is arranged on one side of the pump body, through which the pump body is sealed and excess gas in the pump body is discharged to the outside.

[0008] Preferably, a transmission shaft matching the transmission shaft is arranged in the motor.

[0009] Preferably, the valve group comprises: a valve body arranged close to the pump body and a plurality of distributors arranged on the outer periphery of the valve body, so as to realize internal self-regulation of nitrogen distribution.

[0010] Preferably, a water cooling pipe is provided on the motor.

[0011] Preferably, the interior of the motor is potted with glue.

[0012] Preferably, the packaging assembly comprises:

[0013] Front end cover;

[0014] A bearing seat is disposed close to the front end cover; and

[0015] The bearing is installed in the bearing seat, and the bearing sleeve is arranged on the transmission shaft.

[0016] Preferably, the front end cover is fixedly connected to the pump body via a fastener.

[0017] Preferably, a mechanical seal is provided between the front end cover and the bearing.

[0018] Preferably, a rear cover is provided at the tail end of the pump body.

[0019] Preferably, a sealing ring is provided between the rear cover and the pump body.

[0020] Preferably, each stage of the multi-stage Roots is integrally cast with a flow channel inside.

[0021] Preferably, the multi-stage Roots pump body and rotor are both made of low linear expansion material.

[0022] The beneficial effects of the utility model are:

[0023] (1) The utility model forms a single-motor dual-drive Roots vacuum pump by installing two sets of transmission shafts in the pump body and installing a permanent magnet integrated direct-connected dual-drive motor. The pump has a small size, high working efficiency, good air extraction effect, and is more convenient to use.

[0024] (2) The utility model allows nitrogen to enter the pump body through the valve group, and a weak protective gas film is formed on the inner wall of the pump body to isolate and protect the inner wall of the pump body from corrosion. Combined with the glue potting package of the motor, the vacuum pump has better sealing performance, thereby ensuring the air extraction effect.

[0025] (3) The utility model has a water-cooling pipe on the motor, which has high heat dissipation efficiency. The thermal conductivity of water is good, so the heat can be dissipated more effectively, noise can be reduced, and it is not affected by dust. The water-cooling pipe has a simple structure, a small size, and is easy to disassemble and assemble, thereby improving assembly efficiency and facilitating use.

[0026] (4) The utility model uses a dual-drive integrated motor, has a simple structure, and has internal sealing and a sweep valve group distributor. The Roots vacuum pump has a high degree of integration.

[0027] (5) The utility model forms a completely enclosed space through the entire pump including the motor, has no wearing parts such as mechanical seals, and has strong vacuum reliability.

[0028] (6) The utility model reduces the temperature of the high-temperature section of the pump by distributing gas through the valve group, thereby achieving a higher compression ratio and a higher vacuum degree.

[0029] In summary, the utility model has the advantages of good sealing, good air extraction effect, high working efficiency, simple structure and convenient disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0031] Figure 2 It is a cross-sectional view of the utility model;

[0032] Figure 3 for Figure 2 A magnified image of point A;

[0033] Figure 4 for Figure 2 The enlarged view of point B;

[0034] Figure 5 It is a structural schematic diagram of the valve group of the utility model.

[0035] Figure numerals: 1-pump body; 11-transmission shaft; 12-valve group; 121-valve body; 122-distributor; 13-rear cover; 131-sealing ring; 2-motor; 21-drive shaft; 22 water-cooling pipe; 23-fastener; 3-packaging assembly; 31-front end cover; 32-bearing seat; 33-bearing; 34-seal. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] Example

[0039] like Figure 1-5 As shown, this embodiment provides a single-motor dual-drive Roots vacuum pump, including: a pump body 1 and a motor 2 fixedly connected to the pump body 1, and also including: a packaging component 3 arranged between the pump body 1 and the motor 2, two sets of transmission shafts 11 are arranged in the pump body 1, and the two sets of transmission shafts 11 cooperate with the single motor 2 to form a dual-drive vacuum pump, which improves the working efficiency of the vacuum pump, and has a better vacuum effect and is easy to use. It is driven by the dual-drive motor 2, and the synchronous gear keeps the rotor synchronized, which plays a limiting role. A valve group 12 is arranged on one side of the pump body 1, and the pump body 1 is sealed and the excess gas in the pump body 1 is discharged to the outside through the valve group 12, and the gas introduced into the valve group 12 can seal the pump body 1, that is, a weak protective gas film is formed on the inner wall of the pump body 1, and the pressure of the gas should not be too large or too small. Too large pressure will affect the vacuum effect and increase energy consumption, and too small pressure may result in no protective effect.

[0040] The pump body 1 is divided into a plurality of areas to form a multi-stage Roots center-split structure, i.e., the pump body 1 has multiple stages inside, and each stage is interconnected through the flow channel inside the pump body 1. It is more efficient than a single-stage Roots vacuum pump at the same power, can greatly reduce energy consumption and operating costs, is highly efficient and energy-saving, has a high anti-backblowing capability and an extremely low leakage rate, can ensure long-term stable operation, is not prone to failure, is stable and reliable, and has a wide range of applications.

[0041] Among them, the motor 2 is provided with a driving shaft 21 compatible with the transmission shaft 11, that is, two driving shafts 21 are provided in one motor 2, which can realize the independent transmission of energy of the two mechanical shafts, greatly reduce the volume and weight of the equipment, improve the working efficiency, can well meet the requirements of energy saving and speed regulation, have excellent operating performance, and thus improve the working efficiency of the vacuum pump, so that the air pressure inside the pump body 1 and the motor 2 is the same, there is no oil leakage or air leakage, and because the voltage is divided into two, the total current of the motor is small and the heat generation is lower.

[0042] At the same time, the valve group 12 includes: a valve body 121 arranged close to the pump body 1 and a plurality of distributors 122 arranged on the outer periphery of the valve body 121. The valve group 12 has a simple structure, small size, light weight, less consumables, fast opening and closing, and small flow resistance. It can better control the distribution of nitrogen in the pump body 1, so that the sealing of the pump body 1 is good, thereby ensuring that the vacuum pump is in the best working state, and the gas introduced into the valve body 121 is preferably nitrogen, which can not only purge the inside of the pump body 1 and delay the corrosion of the pump body 1 by corrosive gases, but also dilute the original gas in the pump body 1 to avoid reaction with the pump body 1 during operation, which may cause the Roots vacuum pump to work malfunction.

[0043] In this embodiment, a water cooling pipe 22 is provided on the motor 2. The motor 2 includes a stator and two rotors and other components. Preferably, the water cooling pipe 22 is installed inside the stator of the motor 2. The water inlet and the water outlet of the water cooling pipe 12 are respectively arranged on both sides of the stator of the motor 2. The outer surface of the stator is installed with a frequency converter for changing the frequency of the motor 2 and a temperature sensor for detecting the overall temperature of the motor 2 installed inside. The operation is simple and easy to use. The water cooling pipe 12 makes the heat dissipation efficiency of the motor high. The thermal conductivity of water is good, and the heat can be dissipated more effectively. The water cooling pipe 22 can also reduce noise and is not affected by dust. Even if dust accumulates on its surface, it will not affect the cooling effect. The water cooling pipe 22 has a simple structure, a small size, and is easy to disassemble and assemble. It can be quickly assembled with the motor 2 and is easy to use.

[0044] In this embodiment, the interior of the motor 2 is potted with glue. The potting protection is mainly achieved by using a specific potting glue to seal the key parts such as the electronic components and coils inside the motor 2 to isolate them from harmful external factors such as dust, moisture, chemicals, etc. This not only prevents corrosion and aging of the internal components of the motor 2, but also reduces electrical failures caused by environmental factors, thereby extending the service life of the motor 2 and further ensuring the service life of the vacuum pump.

[0045] In this embodiment, the packaging component 3 includes: a front end cover 31, a bearing seat 32 arranged close to the front end cover 31, and a bearing 33 installed in the bearing seat 32, and the bearing 33 is sleeved on the transmission shaft 11. The packaging component 3 is mainly used to limit the gap between the motor 2 and the pump body 1, so that the two can be completely sealed without leakage and other problems. The bearing 33 is preferably a deep groove ball bearing 33, because it has a small friction coefficient, a high limit speed, a simple structure, a low manufacturing cost, is easy to achieve high manufacturing precision, and is easy to use.

[0046] In this embodiment, the front end cover 31 is fixedly connected to the pump body 1 via a fastener 23 . The fastener 23 is preferably a bolt, which has a simple structure, is easy to assemble and disassemble, has a good fixing effect, and can ensure the sealing of the pump body 1 .

[0047] Of course, a mechanical seal 34 is arranged between the front end cover 31 and the bearing 33, a rear cover 13 is arranged at the tail end of the pump body 1, and a sealing ring 131 is arranged between the rear cover 13 and the pump body 1, and both the sealing ring 131 and the sealing member 34 further enhance the sealing performance of the pump body 1, and the sealing structure of the fixed end of the pump body 1 is preferably assembled by combining an expansion ring, a labyrinth and an oil slinger, and the sealing structure of the driving end (motor side) of the pump body 1 is preferably assembled by combining an expansion ring and a labyrinth, so that the sealing performance of the entire pump body 1 is better to ensure that the pump body 1 will not easily leak, etc., the internal parts of the multi-stage Roots stages are integrally cast through flow channels, and the multi-stage Roots pump body 1 and the rotor are made of low linear expansion materials, so that the vacuum pump has a good vacuuming effect and high working efficiency.

[0048] In addition, the valve group 12 is preferably provided with micropores inside, and the flow rate of each part is distributed through the internal micropores, which can not only dilute the fluid in the pump body 1, but also cool the entire pump body 1 to prevent the pump body 1 from being overheated and overloaded, and can also play a sealing and purging role on the expansion ring seal to avoid the accumulation of impurities such as dust, thereby ensuring the service life of the pump body 1 and preventing impurities from entering the oil tank.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-motor dual-drive Roots vacuum pump, comprising: The pump body and the motor fixedly connected to the pump body are characterized in that they also include: a packaging component arranged between the pump body and the motor, two sets of transmission shafts are arranged in the pump body, and a valve group is arranged on one side of the pump body, through which the pump body is sealed and the excess gas in the pump body is discharged to the outside.

2. A single-motor dual-drive Roots vacuum pump according to claim 1, characterized in that: A driving shaft matched with the transmission shaft is arranged in the motor.

3. A single-motor dual-drive Roots vacuum pump according to claim 1, characterized in that: The valve group comprises: a valve body arranged close to the pump body and a plurality of distributors arranged on the outer periphery of the valve body.

4. A single-motor dual-drive Roots vacuum pump according to claim 1, characterized in that: The motor is provided with a water cooling pipe.

5. A single-motor dual-drive Roots vacuum pump according to claim 1, characterized in that: The interior of the motor is encapsulated by glue potting.

6. A single-motor dual-drive Roots vacuum pump according to claim 2, characterized in that: The packaging assembly comprises: Front end cover; A bearing seat, disposed close to the front end cover; and The bearing is installed in the bearing seat, and the bearing sleeve is arranged on the transmission shaft.

7. A single-motor dual-drive Roots vacuum pump according to claim 6, characterized in that: The front end cover is fixedly connected to the pump body via a fastener.

8. The single-motor dual-drive Roots vacuum pump according to claim 6, characterized in that: A sealing member is provided between the front end cover and the bearing.

9. The single-motor dual-drive Roots vacuum pump according to claim 1, characterized in that: A rear cover is arranged at the tail end of the pump body.

10. A single-motor dual-drive Roots vacuum pump according to claim 9, characterized in that: A sealing ring is arranged between the rear cover and the pump body.

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