Dry vacuum pump

Abstract

The utility model provides a dry vacuum pump. The dry vacuum pump comprises a stator shell, a first motor, a second motor, a driving rotor shaft, a driven rotor shaft, a driving rotor and a driven rotor, the first motor and the second motor are located on the two opposite sides of the stator shell respectively. The driving rotor shaft and the driven rotor shaft are both arranged in the stator shell in a penetrating mode, one end of the driving rotor shaft penetrates through the stator shell to be connected with the first motor, and the driving rotor is arranged on the driving rotor shaft; one end of the driven rotor shaft penetrates through the stator shell to be connected with the second motor, and the driven rotor is arranged on the driven rotor shaft. The dry vacuum pump has the advantages that the design is reasonable, the structure of the dry vacuum pump is optimized, the assembling efficiency is remarkably improved, vibration and impact in the operation process of the whole pump can be reduced, and meanwhile cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum pumps, and particularly relates to a dry vacuum pump. Background Art

[0002] With the improvement of environmental awareness and the progress of technology, dry vacuum pumps are increasingly widely used in many fields such as medicine, food, chemical industry, and electronics. Especially with the continuous expansion of the new energy vehicle market, the demand for dry vacuum pumps will further increase. In addition, with the rapid development of the semiconductor industry, the demand for dry vacuum pumps in industries such as integrated circuits, photovoltaics, LEDs, flat panel displays, and lithium batteries will also continue to grow.

[0003] At present, there are technical problems in the manufacturing process of dry vacuum pumps, such as too many assembled parts and long time consumption, which in turn lead to high overall manufacturing costs. Moreover, the transmission system structure of dry vacuum pumps is single and the stability is poor. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art, and provides a new technical solution for a dry vacuum pump.

[0005] According to one aspect of the present application, a dry vacuum pump is provided, which includes a stator housing, a first motor, a second motor, a driving rotor shaft, a driven rotor shaft, a driving rotor, and a driven rotor; wherein, the first motor and the second motor are respectively located on opposite sides of the stator housing;

[0006] Both the driving rotor shaft and the driven rotor shaft pass through the inside of the stator housing. One end of the driving rotor shaft passes through the stator housing and is connected to the first motor, and the driving rotor is arranged on the driving rotor shaft; one end of the driven rotor shaft passes through the stator housing and is connected to the second motor, and the driven rotor is arranged on the driven rotor shaft;

[0007] The driving rotor meshes with the driven rotor inside the stator housing, and the driving rotor rotates in a first direction under the drive of the first motor, and the driven rotor rotates in a second direction under the drive of the second motor, wherein the first direction is opposite to the second direction.

[0008] Optionally, a first rotor hole is provided at the output end of the first motor, and the driving rotor shaft is embedded in the first rotor hole; and / or,

[0009] A second rotor hole is provided at the output end of the second motor, and the driven rotor shaft is embedded in the second rotor hole.

[0010] Optionally, the dry vacuum pump further includes two frequency converters; one of the frequency converters is integrally connected to the first motor, and the other frequency converter is integrally connected to the second motor.

[0011] Optionally, the synchronous reverse rotation of the first motor and the second motor is achieved by an electric control method.

[0012] Optionally, the stator housing includes a casing, a front wall plate, and a rear wall plate; wherein, the casing includes an upper casing and a lower casing;

[0013] The upper casing is detachably mounted above the lower casing, the front wall plate is detachably mounted on one side of the casing close to the first motor; the rear wall plate is detachably mounted on one side of the casing close to the second motor;

[0014] One end of the driving rotor shaft penetrates through the front wall plate, and the other end penetrates through the rear wall plate;

[0015] One end of the driven rotor shaft penetrates through the front wall plate, and the other end penetrates through the rear wall plate.

[0016] Optionally, the dry vacuum pump further includes two first bearings and two second bearings;

[0017] One end of the driving rotor shaft is rotatably connected to the front wall plate through a first bearing, and the other end is rotatably connected to the rear wall plate through another first bearing;

[0018] One end of the driven rotor shaft is rotatably connected to the front wall plate through a second bearing, and the other end is rotatably connected to the rear wall plate through another second bearing.

[0019] Optionally, the dry vacuum pump further includes a first sealing ring and a second sealing ring;

[0020] A first groove is provided on one side of the casing close to the first motor or a first groove is provided on one side of the front wall plate close to the casing, and the first sealing ring is partially embedded in the first groove to achieve the sealing between the casing and the front wall plate;

[0021] A second groove is provided on one side of the casing close to the second motor or a second groove is provided on one side of the rear wall plate close to the casing, and the second sealing ring is partially embedded in the second groove to achieve the sealing between the casing and the rear wall plate.

[0022] Optionally, both the first sealing ring and the second sealing ring are O-rings.

[0023] Optionally, the dry vacuum pump further includes a positioning pin;

[0024] A positioning pin is provided between the upper housing and the lower housing;

[0025] And / or, a positioning pin is provided between the front wall panel and the housing;

[0026] And / or, a positioning pin is provided between the rear wall panel and the housing.

[0027] Optionally, the dry vacuum pump further includes a first bolt, a second bolt, and a third bolt;

[0028] The upper housing and the lower housing are connected by a plurality of the first bolts;

[0029] The first motor is fixed to the front wall panel by a plurality of the second bolts; the second motor is fixed to the rear wall panel by a plurality of the third bolts.

[0030] One technical effect of the present application is that:

[0031] In the embodiment of the present application, the first motor and the second motor are respectively located on opposite sides of the stator housing; moreover, both the driving rotor shaft and the driven rotor shaft pass through the inside of the stator housing; one end of the driving rotor shaft passes through the stator housing and is connected to the first motor, and the driving rotor is arranged on the driving rotor shaft; one end of the driven rotor shaft passes through the stator housing and is connected to the second motor, and the driven rotor is arranged on the driven rotor shaft. That is to say, the first motor independently drives the driving rotor shaft to rotate, and the second motor independently drives the driven rotor shaft to rotate. The synchronous rotation of the driving rotor and the driven rotor can be realized through a control program, so as to realize the suction and exhaust processes of the dry vacuum pump.

[0032] Therefore, the structural design of the dry vacuum pump is reasonable, the number of assembled parts is reduced, the assembly efficiency is significantly improved, and the manufacturing cost is reduced. At the same time, with the dual-motor configuration of the first motor and the second motor, the application of the driving gear and the driven gear is cancelled, which can reduce the vibration and impact during the operation of the whole pump, save costs at the same time, and realize the synchronous rotation of the dual motors through an increased electronic control strategy, with high operation stability. Description of the Drawings

[0033] Figure 1 It is an exploded structural schematic diagram of a dry vacuum pump according to an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of the connection relationship of the first motor, the second motor, the driving rotor shaft, and the driven rotor shaft of a dry vacuum pump according to an embodiment of the present invention.

[0035] In the figure: 1. First motor; 101. First rotor hole; 2. Second motor; 201. Second rotor hole; 3. Driving rotor shaft; 4. Driven rotor shaft; 5. Driving rotor; 6. Driven rotor; 71. Upper housing; 72. Lower housing; 73. Front wall panel; 74. Rear wall panel;

[0036] 81. First bolt; 82. Second bolt; 83. Third bolt; 91. First bearing;

[0037] 92. Second bearing; 10. First sealing ring; 11. Second sealing ring; 12. Positioning pin. Detailed implementation manners

[0038] Now, various exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0039] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0040] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects. The character " / " generally means an "or" relationship between the associated objects before and after.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.

[0042] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0043] According to one aspect of the present application, referring to Figure 1 and Figure 2 , a dry vacuum pump is provided, which can not only reduce the vibration and impact during the operation of the pump body, but also save the costs related to the use, maintenance of the driving gear and the driven gear, and lubricating oil in terms of cost.

[0044] Specifically, the dry vacuum pump includes a stator housing, a first motor 1, a second motor 2, a driving rotor shaft 3, a driven rotor shaft 4, a driving rotor 5, and a driven rotor 6; wherein, the first motor 1 and the second motor 2 are respectively located on opposite sides of the stator housing; the driving rotor shaft 3 and the driven rotor shaft 4 both pass through the inside of the stator housing, and the driving rotor shaft 3 and the driven rotor shaft 4 are respectively rotatably connected to the stator housing; one end of the driving rotor shaft 3 passes through the stator housing and is connected to the first motor 1, and the driving rotor 5 is arranged on the driving rotor shaft 3; one end of the driven rotor shaft 4 passes through the stator housing and is connected to the second motor 2, and the driven rotor 6 is arranged on the driven rotor shaft 4;

[0045] More specifically, the driving rotor 5 and the driven rotor 6 are meshed inside the stator housing, and the driving rotor 5 rotates in a first direction under the drive of the first motor 1, and the driven rotor 6 rotates in a second direction under the drive of the second motor 2, wherein the first direction is opposite to the second direction.

[0046] In the embodiment of the present application, the first motor 1 independently drives the driving rotor shaft 3 to rotate, and the second motor 2 independently drives the driven rotor shaft 4 to rotate. The synchronous rotation of the driving rotor 5 and the driven rotor 6 can be realized through a control program, so as to realize the suction and exhaust processes of the dry vacuum pump. Therefore, the structural design of the dry vacuum pump is reasonable, the number of assembled parts is reduced, the assembly efficiency is significantly improved, and the manufacturing cost is beneficial to be reduced. At the same time, with the dual-motor configuration of the first motor 1 and the second motor 2, the application of the driving gear and the driven gear is cancelled, the vibration and impact during the operation of the whole pump can be reduced, the cost can be saved at the same time, and the synchronous rotation of the dual motors is realized by adding an electronic control strategy, and the operation stability is high.

[0047] In addition, when the whole pump is running, to ensure the synchronization of the driving rotor shaft 3 and the driven rotor shaft 4, a specific electric control program needs to be compiled for precise control.

[0048] Exemplarily, the driving rotors at all levels on the driving rotor shaft 3 and the driven rotors at all levels on the driven rotor shaft 4 are located in the internal chambers at all levels of the stator housing, and the driving rotors and the driven rotors at all levels perform relative rotation, while the stator housing and the internal chambers at all levels are in a stationary and fixed state.

[0049] Optionally, a first rotor hole 101 is provided at the output end of the first motor 1, and the driving rotor shaft 3 is embedded in the first rotor hole 101; and / or,

[0050] A second rotor hole 201 is provided at the output end of the second motor 2, and the driven rotor shaft 4 is embedded in the second rotor hole 201.

[0051] In the above embodiment, the positioning connection between the output end of the first motor 1 and the driving rotor shaft 3 is realized through the first rotor hole 101, and the positioning connection between the output end of the second motor 2 and the driven rotor shaft 4 is realized through the second rotor hole 201, and the connection method is relatively simple. Moreover, by reducing the cantilevers of the first motor 1 and the second motor 2, the natural frequencies of the driving rotor 5 on the driving rotor shaft 3 and the driven rotor 6 on the driven rotor shaft 4 can be increased, which helps to reduce the power consumption of the dry vacuum pump and lower the cost. Moreover, since the motor structures of the first motor 1 and the second motor 2 do not require bearings, no lubricating oil is needed, which helps to further reduce the cost.

[0052] Optionally, the dry vacuum pump further includes two frequency converters (not shown in the figure); one frequency converter is integrally connected to the first motor 1, and the other frequency converter is integrally connected to the second motor 2.

[0053] In the above embodiment, one frequency converter is integrally connected to the first motor 1. For example, the frequency converter control hardware is integrated inside the first motor 1, so as to upgrade the direct drive of the first motor 1 to a frequency conversion drive to realize the automatic adjustment of the rotation speed of the first motor 1 under different load conditions. Similarly, the other frequency converter is integrally connected to the second motor 2. For example, the frequency converter control hardware is integrated inside the second motor 2, so as to upgrade the direct drive of the second motor 2 to a frequency conversion drive to realize the automatic adjustment of the rotation speed of the second motor 2 under different load conditions.

[0054] Optionally, the synchronous reverse rotation of the first motor 1 and the second motor 2 is realized through an electric control method. Realizing the synchronous reverse rotation of the first motor 1 and the second motor 2 through an electric control method helps to realize the synchronous meshing rotation of the driving rotor 5 and the driven rotor 6, and further realize the function of the dry vacuum pump for pumping and compressing gas.

[0055] Optionally, the stator housing includes a casing, a front wall plate 73, and a rear wall plate 74; wherein, the casing includes an upper casing 71 and a lower casing 72;

[0056] The upper casing 71 is detachably mounted above the lower casing 72, and the front wall plate 73 is detachably mounted on one side of the casing close to the first motor 1; the rear wall plate 74 is detachably mounted on one side of the casing close to the second motor 2;

[0057] One end of the driving rotor shaft 3 passes through the front wall plate 73 and is rotatably connected to the front wall plate 73, and the other end passes through the rear wall plate 74 and is rotatably connected to the rear wall plate 74;

[0058] One end of the driven rotor shaft 4 passes through the front wall plate 73 and is rotatably connected to the front wall plate 73, and the other end passes through the rear wall plate 74 and is rotatably connected to the rear wall plate 74.

[0059] In the above embodiment, the structure of the stator housing is reasonably designed, which is not only convenient for assembly, significantly improves the assembly efficiency, reduces the manufacturing cost, but also helps to optimize the volume of the dry vacuum pump, and has good assembly consistency, thereby improving the stability.

[0060] Optionally, the dry vacuum pump further includes a first bolt 81; the upper casing 71 and the lower casing 72 are connected by a plurality of first bolts 81. This makes the connection relationship between the upper casing 71 and the lower casing 72 relatively simple, and the installation and disassembly are very convenient.

[0061] Optionally, the dry vacuum pump further includes two first bearings 91 and two second bearings 92;

[0062] One end of the driving rotor shaft 3 is rotatably connected to the front wall plate 73 through a first bearing 91, and the other end is rotatably connected to the rear wall plate 74 through another first bearing 91;

[0063] One end of the driven rotor shaft 4 is rotatably connected to the front wall plate 73 through a second bearing 92, and the other end is rotatably connected to the rear wall plate 74 through another second bearing 92.

[0064] In the above embodiment, the connection relationship between the driving rotor shaft 3 and the stator housing is relatively simple, which is convenient for assembling the driving rotor shaft 3 and the stator housing. Moreover, the connection relationship between the driven rotor shaft 4 and the stator housing is relatively simple, which is convenient for assembling the driven rotor shaft 4 and the stator housing.

[0065] Optionally, the dry vacuum pump further includes a first sealing ring 10 and a second sealing ring 11;

[0066] A first groove is provided on one side of the casing close to the first motor 1, or a first groove is provided on one side of the front wall plate 73 close to the casing. A part of the first sealing ring 10 is embedded in the first groove to achieve the sealing between the casing and the front wall plate 73.

[0067] A second groove is provided on one side of the casing close to the second motor 2, or a second groove is provided on one side of the rear wall plate 74 close to the casing. A part of the second sealing ring 11 is embedded in the second groove to achieve the sealing between the casing and the rear wall plate 74.

[0068] In the above embodiment, the sealing performance of the stator housing can be better ensured by the first sealing ring 10 and the second sealing ring 11, so as to better ensure the working stability of the dry vacuum pump.

[0069] Optionally, both the first sealing ring 10 and the second sealing ring 11 are O-rings. This helps to improve the sealing effect of the first sealing ring 10 and the second sealing ring 11.

[0070] In a specific embodiment, a special-shaped sealing member is provided between the upper casing 71 and the lower casing 72 to achieve the sealing between the upper casing 71 and the lower casing 72, and precise positioning between the upper casing 71 and the lower casing 72 is achieved through positioning pins, and then the upper casing 71 and the lower casing 72 are locked with the first bolt 81. Among them, the special-shaped sealing member can be a regular sealing strip or a special-shaped sealing strip with axial positioning.

[0071] For example, the front wall plate 73 and the casing are fixed by bolts, and the rear wall plate 74 and the casing are also fixed by bolts.

[0072] Optionally, the dry vacuum pump further includes a positioning pin 12;

[0073] A positioning pin is provided between the upper casing 71 and the lower casing 72;

[0074] And / or, a positioning pin is provided between the front wall plate 73 and the casing;

[0075] And / or, a positioning pin is provided between the rear wall plate 74 and the casing.

[0076] In the above embodiment, the positioning pin 12 can achieve precise positioning between the upper casing 71 and the lower casing 72, between the front wall plate 73 and the casing, and between the rear wall plate 74 and the casing, prevent displacement during the assembly of each part, and better ensure the assembly consistency of the dry vacuum pump.

[0077] Optionally, the dry vacuum pump further includes a second bolt 82 and a third bolt 83;

[0078] The first motor 1 is fixed to the front wall panel 73 by a plurality of the second bolts 82; the second motor 2 is fixed to the rear wall panel 74 by a plurality of the third bolts 83.

[0079] In the above embodiment, the first motor 1 can be quickly and firmly fixed to the front wall panel 73 by the second bolts 82, which is beneficial to simplify the assembly of the first motor 1. The second motor 2 can be quickly and firmly fixed to the rear wall panel 74 by the third bolts 83, which is beneficial to simplify the assembly of the second motor 2.

[0080] In the embodiment of the present application, the front wall panel 73 and the rear wall panel 74 are respectively assembled on both sides of the housing; at the same time, both ends of the driving rotor shaft 3 are tightly connected to two first bearings 91 assembled on the front wall panel 73 and the rear wall panel 74 respectively, and both ends of the driven rotor shaft 4 are tightly connected to two second bearings 92 assembled on the front wall panel 73 and the rear wall panel 74 respectively; a first sealing ring 10 is arranged between the housing and the front wall panel 73, and a second sealing ring 11 is arranged between the housing and the rear wall panel 74 to realize the sealing of the stator housing. Further, since the use of bearings is cancelled in the internal structures of the first motor 1 and the second motor 2, the cost of lubricating oil can be saved. At the same time, the application of couplings between the first motor 1 and the driving rotor shaft 3 and between the second motor 2 and the driven rotor shaft 4 is cancelled, which reduces costs and improves efficiency while avoiding deviations in the manufacturing and assembly processes, and the assembly consistency is good. Therefore, the dry vacuum pump has a simple structure and good assembly consistency, and moreover, it has a smaller volume and lower energy consumption compared with the existing structure, and can significantly improve stability while reducing vibration.

[0081] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A dry vacuum pump, characterized in that, It includes a stator housing, a first motor, a second motor, a driving rotor shaft, a driven rotor shaft, a driving rotor and a driven rotor; wherein, the first motor and the second motor are respectively located on opposite sides of the stator housing; The driving rotor shaft and the driven rotor shaft both pass through the inside of the stator housing. One end of the driving rotor shaft passes through the stator housing and is connected to the first motor, and the driving rotor is arranged on the driving rotor shaft; one end of the driven rotor shaft passes through the stator housing and is connected to the second motor, and the driven rotor is arranged on the driven rotor shaft; The driving rotor meshes with the driven rotor inside the stator housing, and the driving rotor rotates in a first direction driven by the first motor, and the driven rotor rotates in a second direction driven by the second motor, wherein the first direction is opposite to the second direction.

2. The dry vacuum pump according to claim 1, wherein A first rotor hole is provided at the output end of the first motor, and the driving rotor shaft is embedded in the first rotor hole; and / or, A second rotor hole is provided at the output end of the second motor, and the driven rotor shaft is embedded in the second rotor hole.

3. The dry vacuum pump according to claim 1, characterized in that, It further includes two frequency converters; one frequency converter is integrally connected to the first motor, and the other frequency converter is integrally connected to the second motor.

4. The dry vacuum pump according to claim 1, characterized in that, The synchronous reverse rotation of the first motor and the second motor is realized by an electric control method.

5. The dry vacuum pump according to claim 1, characterized in that, The stator housing includes a casing, a front wall plate and a rear wall plate; wherein, the casing includes an upper casing and a lower casing; The upper casing is detachably installed above the lower casing, the front wall plate is detachably installed on one side of the casing close to the first motor; the rear wall plate is detachably installed on one side of the casing close to the second motor; One end of the driving rotor shaft passes through the front wall plate, and the other end passes through the rear wall plate; One end of the driven rotor shaft passes through the front wall plate, and the other end passes through the rear wall plate.

6. The dry vacuum pump according to claim 5, wherein, It further includes two first bearings and two second bearings; One end of the driving rotor shaft is rotatably connected to the front wall plate through a first bearing, and the other end is rotatably connected to the rear wall plate through another first bearing; One end of the driven rotor shaft is rotatably connected to the front wall plate through a second bearing, and the other end is rotatably connected to the rear wall plate through another second bearing.

7. The dry vacuum pump according to claim 5, characterized in that, It further includes a first sealing ring and a second sealing ring; A first groove is provided on one side of the casing close to the first motor or a first groove is provided on one side of the front wall plate close to the casing, and the first sealing ring is partially embedded in the first groove to realize the sealing between the casing and the front wall plate; A second groove is provided on one side of the casing close to the second motor or a second groove is provided on one side of the rear wall plate close to the casing, and the second sealing ring is partially embedded in the second groove to realize the sealing between the casing and the rear wall plate.

8. The dry vacuum pump according to claim 7, wherein Both the first sealing ring and the second sealing ring are O-rings.

9. The dry vacuum pump according to claim 5, characterized in that, It further includes a positioning pin; A positioning pin is provided between the upper casing and the lower casing; and / or, a positioning pin is provided between the front wall plate and the casing; And / or, a positioning pin is provided between the rear wall panel and the casing.

10. The dry vacuum pump according to claim 5, characterized in that, It further includes a first bolt, a second bolt, and a third bolt; The upper casing and the lower casing are connected by a plurality of the first bolts; The first motor is fixed to the front wall panel by a plurality of the second bolts; The second motor is fixed to the rear wall panel by a plurality of the third bolts.

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