CN218733684U

CN218733684U - Permanent magnetic shielding type electric driving device for vacuum pump

Info

Publication number: CN218733684U
Application number: CN202222305664.1U
Authority: CN
Inventors: 周大财
Original assignee: Shanghai Bainuo Pumps And Valves Co ltd
Current assignee: Shanghai Bainuo Pumps And Valves Co ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2023-03-24
Anticipated expiration: 2032-08-30

Abstract

The utility model relates to a permanent magnetic shielding type electric driving device for a vacuum pump, which comprises a base, a rotor assembly, a stator assembly and a shielding cover, wherein the base is arranged on an end cover and sleeved outside a pump shaft, the rotor assembly is sleeved on the pump shaft, the stator assembly is fixedly arranged on the inner wall of the base, and the shielding cover is fixedly arranged between the rotor assembly and the stator assembly; wherein be equipped with the shield cover baffle in the shield cover, the shield cover baffle is for negative pressure chamber and shield cover cooling chamber with shield cover inner space separation, and the pump shaft is located the negative pressure intracavity, still sets up the cooling water import pipe and the cooling water outlet pipe that communicate shield cover cooling chamber on the shield cover. Compared with the prior art, the utility model discloses an add shield cover cooling chamber in the shield cover to set up cooling water outlet pipe, cooling water import pipe in order to constitute cooling passage, in time walk the dissipation with the shield cover vortex tropical through with shield cover direct contact, avoid the shield cover to be heated and warp, thereby make its structure inefficacy warp, sealed effect is difficult to the problem that obtains the assurance.

Description

Permanent magnetic shielding type electric driving device for vacuum pump

Technical Field

The utility model belongs to the technical field of the canned motor pump, a permanent magnetism shielding formula electric drive device for vacuum pump is related to.

Background

At present, a high-precision vacuum pump, such as a helium mass spectrometer leak detection device system, is configured with a vacuum pump which has extremely high requirements on vacuum degree and stably maintains the extremely high vacuum degree for a long time, and a common vacuum pump, a pump and a motor for driving rotation adopt a rotary mechanical seal to maintain the sealing performance, but because the rotary mechanical seal has trace leakage and has a short service life, the requirement on the extremely high vacuum degree is difficult to achieve.

In foreign related documents, a drive motor of the high-precision vacuum pump adopts a leakage-free shield motor, a static seal replaces a rotary seal, and a totally-enclosed shield motor replaces a common motor, so that the requirement of keeping high vacuum degree is met. When the canned motor works, the transmission connection between the motor and the pump shaft is realized through the inner and outer stator and rotor assemblies, and the sealing isolation between the pump cavity and the outside is realized through the shielding cover between the stator and the rotor. However, when the magnetic shielding device is used, eddy heat is generated and accumulated on the shielding cover due to the continuously changing magnetic field between the stator and the rotor, the shielding cover is easily heated and deformed due to long-time high-power work, the structure of the shielding cover is deformed due to failure, and the sealing effect is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a permanent magnetism shielding formula electric drive device for vacuum pump.

The purpose of the utility model can be realized through the following technical scheme:

a permanent magnetic shielding type electric driving device for a vacuum pump comprises a base, a rotor assembly, a stator assembly and a shielding cover, wherein the base is arranged on an end cover and sleeved outside a pump shaft; wherein,

the pump shaft is arranged in the negative pressure cavity, and the shield cover is further provided with a cooling water inlet pipe and a cooling water outlet pipe which are communicated with the shield cover cooling cavity.

Furthermore, a partition plate is arranged in the cooling cavity of the shielding cover, the partition plate divides the inner space of the cooling cavity of the shielding cover into a water inlet cavity and a water outlet cavity, the cooling water inlet pipe is communicated with the water inlet cavity, the cooling water outlet pipe is communicated with the water outlet cavity,

the division plate is also provided with a flow guide channel for communicating the water inlet cavity with the water outlet cavity.

Furthermore, the vacuum pump is a horizontal vacuum pump, the partition plate is horizontally arranged, and the cooling water inlet pipe and the cooling water outlet pipe are arranged in parallel one after another.

Furthermore, the base is provided with a mounting hole of the shielding cover, and the outer end of the shielding cover is embedded in the mounting hole of the shielding cover.

Furthermore, the outer end of the shielding cover is embedded in the mounting hole of the shielding cover and extends out, a dustproof cover is further arranged at the extending end, and the cooling water outlet pipe and the cooling water inlet pipe penetrate through the dustproof cover and extend out.

Furthermore, a cooling channel is arranged in the base and is communicated with a cooling medium, and the cooling channel is wound outside the stator assembly.

Furthermore, the cooling channel is spirally wound outside the stator assembly.

Furthermore, the outer edge of the inner end of the shielding cover extends outwards along the radial direction of the pump shaft and is clamped and fixed between the end cover and the base.

Furthermore, a sealing ring is arranged between the end cover and the outer edge of the inner end of the shielding cover and is in sealing connection with the outer edge of the inner end of the shielding cover through the sealing ring.

Furthermore, a support ring is arranged between the inner wall of the machine base and the outer wall of the shielding pump.

And the pump shaft is in a three-stage ladder shape along the axial direction outwards, the diameter of the pump shaft is gradually reduced, the outer end of the pump shaft is in threaded connection with a round nut, and the rotor assembly is sleeved outside the second-stage ladder and is clamped and fixed between the first-stage ladder and the round nut.

And an anti-collision pad is arranged between the round nut and the end part of the rotor assembly.

The base is also provided with a junction box.

Compared with the prior art, the utility model has the characteristics of it is following:

1) The utility model discloses an add shield cover cooling chamber in the shield cover to set up cooling water outlet pipe, cooling water inlet pipe in order to constitute the cooling circuit, in time walk away the hot band of shield cover vortex through directly contacting with the shield cover and dissipate, avoid the shield cover to be heated and warp, thereby make its structure inefficacy warp, the problem that sealed effect is difficult to obtain the assurance;

2) The utility model is provided with the cooling water inlet pipe at the lower side of the cooling cavity of the shielding case and the cooling water outlet pipe at the upper side, so as to ensure the staying time of the cooling water in the cooling cavity of the shielding case and the cooling effect; meanwhile, the utility model arranges the flow guide channel for communicating the water inlet cavity and the water outlet cavity at one side far away from the water inlet and outlet pipes so as to avoid the short flow of cooling water;

3) The utility model discloses a cooling channel is seted up to the spiral on the frame to carry out abundant cooling to stator module, improve motor power density, make the motor small, efficient.

Drawings

FIG. 1 is a schematic structural diagram of a permanent-magnet shielded electric driving device dedicated for a horizontal vacuum pump in an embodiment;

FIG. 2 is a front cross-sectional view of the housing;

FIG. 3 is a left side view of the housing;

the notation in the figure is:

the structure comprises an end cover 1, a base 2, a pump shaft 3, a rotor assembly 4, a stator assembly 5, a shield cover 6, a shield cover 7, a shield cover partition plate 8, a shield cover cooling cavity 9, a partition plate 10, a shield cover mounting hole 11, a dust cap 12, a cooling channel 12, an inner hexagon bolt 13, a sealing ring 14, a support ring 15, a round nut 16, an anti-collision pad 17 and a junction box 18.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

The embodiment is as follows:

as shown in fig. 1, the special permanent magnetic shielding type electric driving device for a horizontal vacuum pump comprises a base 2 which is arranged on an end cover 1 and sleeved outside a pump shaft 3, a rotor assembly 4 which is sleeved on the pump shaft 3, a stator assembly 5 which is fixedly arranged on the inner wall of the base 2, a shielding cover 6 which is fixedly arranged between the rotor assembly 4 and the stator assembly 5, and a junction box 18 which is arranged on the base 2; wherein, a shield cover clapboard 7 is arranged in the shield cover 6, the shield cover clapboard 7 divides the inner space of the shield cover 6 into a negative pressure cavity and a shield cover cooling cavity 8 from left to right (in the direction of the figure), and the pump shaft 3 is positioned in the negative pressure cavity.

A partition plate 9 is horizontally arranged in the shield cooling cavity 8, the internal space of the shield cooling cavity 8 is divided into a water inlet cavity and a water outlet cavity by the partition plate 9, a cooling water inlet pipe is arranged on the water inlet cavity, a cooling water outlet pipe is arranged on the water outlet cavity, and a flow guide channel for communicating the water inlet cavity with the water outlet cavity is further arranged on the partition plate 9.

As shown in fig. 2, a shield mounting hole 10 is formed in the housing 2, an outer end of the shield 6 is embedded in the shield mounting hole 10 and extends out, a dust cap 11 is further disposed at the extending end, and the cooling water outlet pipe and the cooling water inlet pipe pass through the dust cap 11 and extend out.

As shown in fig. 2 and 3, a cooling channel 12 is further disposed in the housing 2 and a cooling medium flows through the cooling channel 12, and the cooling channel 12 is spirally wound around the stator assembly 5.

In order to ensure a good assembly effect between the shielding cover 6 and the base 2, the outer edge of the inner end of the shielding cover 6 extends outwards along the radial direction of the pump shaft 3 and is clamped and fixed between the end cover 1 and the base 2, and the end cover 1 and the base 2 are further fixed through the hexagon socket head cap screw 13.

In order to ensure the sealing effect of the joint, a sealing ring 14 is arranged between the end cover 1 and the outer edge of the inner end of the shielding case 6 and is connected in a sealing way through the sealing ring 14.

In order to avoid the effect of the pressure difference between the inside and the outside of the shielding case 6 to make it collapse, a support ring 15 is further arranged between the inner wall of the base 2 and the outer wall of the shielding case 6, and two ends of the support ring 15 are respectively bonded or welded on the corresponding side walls.

In order to avoid the axial slippage of the rotor assembly 4 during high-speed rotation, the pump shaft 3 is designed to be three-stage stepped shape with gradually decreasing diameter along the axial direction, the outer end of the pump shaft is connected with a round nut 16 through threads, and the rotor assembly 4 is sleeved outside the second-stage stepped shape and is clamped and fixed between the first-stage stepped shape and the round nut 16. And an anti-collision pad 17 is arranged between the round nut 16 and the end part of the rotor assembly 4.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims

1. A permanent magnetic shielding type electric driving device for a vacuum pump is a horizontal vacuum pump and comprises a base (2) which is arranged on an end cover (1) and sleeved outside a pump shaft (3), a rotor assembly (4) sleeved on the pump shaft (3), a stator assembly (5) fixedly arranged on the inner wall of the base (2) and a shielding cover (6) fixedly arranged between the rotor assembly (4) and the stator assembly (5); it is characterized in that the preparation method is characterized in that,

a shielding cover partition plate (7) is arranged in the shielding cover (6), the shielding cover partition plate (7) divides the inner space of the shielding cover (6) into a negative pressure cavity and a shielding cover cooling cavity (8), the pump shaft (3) is positioned in the negative pressure cavity, and a cooling water inlet pipe and a cooling water outlet pipe which are communicated with the shielding cover cooling cavity (8) are also arranged on the shielding cover (6);

the shielding case cooling chamber (8) in the level be equipped with division board (9), division board (9) with shielding case cooling chamber (8) inner space on one by one separate for intake antrum and play water cavity, cooling water import pipe be linked together with the intake antrum, cooling water outlet pipe be linked together with a water cavity, division board (9) on still be equipped with the water conservancy diversion passageway of intercommunication intake antrum and play water cavity.

2. The permanent magnetic shielding type electric driving device for the vacuum pump according to claim 1, wherein a shielding case mounting hole (10) is formed in the base (2), and the outer end of the shielding case (6) is embedded in the shielding case mounting hole (10).

3. The permanent magnetic shielding type electric driving device for the vacuum pump according to claim 2, wherein the outer end of the shielding case (6) is embedded in and extends out of the shielding case mounting hole (10), the extending end is further provided with a dustproof cover (11), and the cooling water outlet pipe and the cooling water inlet pipe penetrate through the dustproof cover (11) and extend out.

4. The permanent magnetic shielding type electric driving device for the vacuum pump according to claim 1, wherein a cooling channel (12) is arranged in the base (2) and is flowed with a cooling medium, and the cooling channel (12) is wound outside the stator assembly (5).

5. A permanently magnetic-shielding electric drive unit for a vacuum pump according to claim 4, characterized in that said cooling channel (12) is spirally wound around the stator assembly (5).

6. A permanent magnetic shielding type electric driving device for a vacuum pump according to claim 1, characterized in that the outer edge of the inner end of the shielding cover (6) extends radially outwards along the pump shaft (3) and is clamped and fixed between the end cover (1) and the base (2).

7. A permanent magnetic shielding type electric driving device for a vacuum pump according to claim 1, characterized in that a sealing ring (14) is further arranged between the end cover (1) and the outer edge of the inner end of the shielding case (6) and is connected in a sealing manner through the sealing ring (14).

8. A permanently magnetic-shielding electric drive device for a vacuum pump according to claim 1, characterized in that a support ring (15) is further provided between the inner wall of said housing (2) and the outer wall of said shielding cage (6).

9. The permanent magnetic shielding type electric driving device for the vacuum pump as claimed in claim 1, wherein the pump shaft (3) is in a three-stage step shape along the axial direction outwards, the diameter of the pump shaft is gradually reduced, a round nut (16) is in threaded connection with the outer end of the third stage step, and the rotor assembly (4) is sleeved outside the second stage step and is clamped and fixed between the first stage step and the round nut (16).

10. A magnetically shielded electric drive unit for vacuum pumps according to claim 9, characterized in that an anti-collision pad (17) is provided between the round nut (16) and the end of the rotor assembly (4).