CN112283108A

CN112283108A - Outer rotor rotary vane vacuum pump directly driven by permanent magnet synchronous motor

Info

Publication number: CN112283108A
Application number: CN202011190569.0A
Authority: CN
Inventors: 高永新; 杨迪; 戴忠林
Original assignee: Liaoning Technical University
Current assignee: Liaoning Technical University
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-01-29

Abstract

The invention discloses an outer rotor rotary vane vacuum pump directly driven by a permanent magnet synchronous motor, which comprises a rotary vane vacuum pump oil tank, wherein vacuum pump oil is arranged in the rotary vane vacuum pump oil tank; the high-cavity rotor is positioned in the inner wall of the pump body stator and is eccentrically arranged at the top end, and the top end is tightly combined with the upper wall of the pump body stator to separate two channels of an air inlet and an air outlet; one end of the inlet of the cooling channel is communicated with the outside, the other end of the inlet of the cooling channel penetrates through the high-cavity end cover, a main path is divided into 8 pipelines which are uniformly distributed to penetrate through the motor stator sleeve, and the 8 pipelines after penetration are gathered into a main path, namely the outlet of the cooling channel is connected with the outside. The invention changes the traditional driving mode and the rotary vane type vacuum pump structure, can realize direct drive of the vacuum pump rotor, reduces the system volume, improves the mechanical efficiency, saves energy and protects environment.

Description

Outer rotor rotary vane vacuum pump directly driven by permanent magnet synchronous motor

Technical Field

The invention belongs to the field of vacuum equipment, and particularly relates to an outer rotor rotary vane vacuum pump directly driven by a permanent magnet synchronous motor.

Background

A rotary vane vacuum pump (rotary vane pump for short) is an oil-sealed mechanical vacuum pump. The rotary vane pump mainly comprises a pump body, a rotor, a rotary vane, an end cover, a spring and the like. A rotor is eccentrically arranged in the cavity of the rotary vane pump, the excircle of the rotor is tangent to the inner surface of the pump cavity, and two rotary vanes with springs are arranged in a rotor groove. When the rotor rotates, the top end of the rotor plate is kept in contact with the inner wall of the pump cavity by virtue of centrifugal force and the tension of the spring, and the rotor rotates to drive the rotor plate to slide along the inner wall of the pump cavity.

From the appearance of the mechanical structure of a rotary vane vacuum pump (compressor) to the present, the application range of the mechanical structure is continuously expanded, and the mechanical structure is widely applied to the industries of vacuum pumps, compressors, air compressors and the like. With the increasing development and maturity of new technology, the number of the blades in the pump body is different from single blade to multiple blade, and the placing mode of the blades is eccentric and concentric. The stator molded lines of the pump body also have various linear structures such as a circle, an ellipse, a Pascal spiral line and a simple harmonic line. After hundreds of years of accumulated experience in foreign countries, the manufacturing design of the rotary vane pump is very mature and mainstream for vehicles

Vacuum pump manufacturers include enterprises such as MAGNA, WABCO, pilberg, BOSCH, UCAL, and Hira. The rotary vane pump produced by the method has a plurality of driving modes, including independent motor driving, belt driving, direct driving of an engine camshaft and the like. The molded line of the pump cavity has various forms such as a circle, an ellipse, a Pascal spiral line, a simple harmonic molded line and the like; the number of the rotary sheets is also different from one sheet to a plurality of sheets; the lubrication method is divided into a dry type and a wet type.

In the prior art, a single-phase or three-phase asynchronous motor is generally used as a driving component, and an output shaft is connected with an input shaft of a pump body through a coupler so as to drive a rotor of the pump body to move. The driving motor and the rotary vane vacuum pump are two independent parts, and due to the structural characteristics of the asynchronous motor, the actual efficiency is only 65-70%, so the system is large in size, long in transmission chain, slow in dynamic response and poor in energy conservation.

The patent with application number 201911116632.3 discloses a rotary vane vacuum pump, which mainly comprises a supporting bottom plate, a motor and a motor dismounting unit. The motor drives the rotor of the rotary-vane vacuum pump to rotate through the synchronous belt. The method has the problems of low transmission efficiency, high requirement on working conditions and complex structure.

The patent with application number 97237726.3 discloses a direct rotary vane vacuum pump, which integrally places a driving motor, a rigid coupling and a pump body part in a pump shell, and prevents the occurrence of the phenomenon of 'oil return' by installing a vacuum safety valve by itself. But the problems of low transmission efficiency and complex structure are not solved well in nature, and meanwhile, the problem of difficult disassembly and maintenance is derived.

Patent No. 201610237214.X discloses a rotary vane vacuum pump using a canned motor, which integrally connects a rotor shaft of a driving motor and a pump body rotor shaft, and although transmission efficiency is ensured, the whole volume is still large.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide an outer rotor rotary vane vacuum pump directly driven by a permanent magnet synchronous motor, which changes the traditional driving mode and the rotary vane vacuum pump structure, can realize direct drive of a vacuum pump rotor, reduces the system volume, improves the mechanical efficiency, and is energy-saving and environment-friendly.

In order to solve the technical problems, the invention is realized by the following technical scheme: an outer rotor rotary vane vacuum pump directly driven by a permanent magnet synchronous motor comprises a rotary vane vacuum pump oil tank with vacuum pump oil inside, a pump body stator is soaked in the vacuum pump oil, and an O-shaped sealing ring and an oil box respectively isolate an air inlet and an air outlet on the pump body stator from the vacuum pump oil; the high-cavity rotor is positioned in the inner wall of the pump body stator and is eccentrically arranged at the top end, and the top end is tightly combined with the upper wall of the pump body stator to separate two channels of an air inlet and an air outlet; one end of the inlet of the cooling channel is communicated with the outside, the other end of the inlet of the cooling channel penetrates through the high-cavity end cover, a main path is divided into 8 pipelines which are uniformly distributed to penetrate through the motor stator sleeve, and the 8 pipelines after penetration are gathered into a main path, namely the outlet of the cooling channel is connected with the outside.

Furthermore, an exhaust valve end cover is welded at the upper end of the oil box and fixed on the pump body stator through a screw, and an exhaust valve spring is arranged in the oil box and tightly presses an exhaust valve plate; the pump body stator is characterized in that the top end of a high-cavity rotor inside the pump body stator is tightly attached to the pump body stator, a motor rotor is embedded in the high-cavity rotor, a high-cavity rotor is arranged on the high-cavity rotor, a rotor spring is arranged inside the high-cavity rotor, and a guide rod is arranged inside the rotor spring.

Further, the outer rotor permanent magnet synchronous motor comprises a motor stator, a motor rotor, a permanent magnet, a central shaft and a stator sleeve, wherein the outer side of the motor rotor is embedded in the high-cavity rotor in an interference fit mode, the permanent magnet is arranged on the inner surface of the motor rotor, an air gap is formed between the permanent magnet and the motor stator, a motor stator slot is formed in the motor stator, a stator coil winding is arranged in the motor stator slot, the motor stator is externally embedded in the stator sleeve in a fit mode, and the stator sleeve is connected with the central shaft through a key.

Furthermore, the end cover is fixed on the high-cavity end cover through screws, meanwhile, the high-cavity end cover is fixed on one end face of the pump body stator through screws, and the low-cavity end cover is fixed on the other end face of the pump body stator through screws; and one end of the central shaft extending out of the pump body stator is connected with a sliding bearing through a matching relationship, and the sliding bearing is supported in the end cover and the high-cavity end cover.

Furthermore, the oil drain plug screw and the oil inlet plug screw are both connected to the upper end face and the side end face of the rotary-vane vacuum pump oil tank through threads, and a flange fixed through screws is arranged on the rotary-vane vacuum pump oil tank to tightly press the air inlet.

Therefore, the rotary vane vacuum pump directly driven by the inner rotor permanent magnet synchronous motor at least has the following beneficial effects:

(1) the traditional rotary-vane vacuum pump driving motor adopts a single-phase or three-phase asynchronous motor, the motor is connected with a transmission shaft of the rotary-vane vacuum pump through a coupler, the efficiency of the asynchronous motor is generally 65-70%, and the efficiency is not high. The rotary-vane vacuum pump and the motor are mutually independent, the volume is large, the transmission chain is long, and the mechanical efficiency is low. Compared with an asynchronous motor, the outer rotor permanent magnet synchronous motor has higher efficiency, the motor is embedded into the rotary vane vacuum pump body, the rotary vane vacuum pump body and the rotary vane vacuum pump body are combined into a whole, the energy loss is reduced, the mechanical efficiency is improved, the system volume is reduced, and the structure is more compact.

(2) According to the temperature field distribution of the outer rotor permanent magnet motor in related documents, the inner sleeve of the stator of the outer rotor permanent magnet synchronous motor is provided with a refrigeration channel, cooling medium enters the motor from a cooling channel inlet and is discharged from a channel outlet after passing through the inner part of the motor stator, so that a large amount of heat generated during the operation of the motor, a central shaft and a bearing is taken away, and an obvious heat dissipation effect is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings are used to provide further understanding of the technical solutions of the present invention and constitute a part of the specification, and together with the embodiments of the present application, serve to explain the technical solutions of the present invention and do not constitute a limitation of the technical solutions of the present invention. The drawings of the embodiments will be briefly described below.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a view A-A of FIG. 1 of the present invention;

FIG. 3 is an enlarged schematic view at F of FIG. 2 of the present invention;

FIG. 4 is an enlarged schematic view of the invention at B of FIG. 1;

FIG. 5 is an enlarged schematic view of the invention at C of FIG. 1;

FIG. 6 is an enlarged schematic view at D of FIG. 1 in accordance with the present invention;

fig. 7 is an enlarged schematic view at E of fig. 2 of the present invention.

Description of the drawings: 1-rotary vane vacuum pump oil tank, 2-oil baffle component, 4-exhaust valve end cover, 5-exhaust valve spring, 6-oil box, 7-exhaust valve plate, 8-high cavity rotor, 9-high cavity rotary vane, 10-rotary vane spring, 11-guide rod, 12-pump body stator, 13-motor rotor, 14-permanent magnet, 15-motor stator, 16-stator sleeve, 17-central shaft, 18-key, 19-O type sealing ring, 20-end cover, 22-sliding bearing, 23-high cavity end cover, 26-middle wall, 31-oil drain plug, 37-low cavity end cover, 39-pillar, 40-oil inlet plug, 41-exhaust port, 43-air inlet, 45-flange, 51-motor cooling channel outlet, motor cooling channel inlet 52.

Detailed Description

Other aspects, features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which form a part of this specification, and which illustrate, by way of example, the principles of the invention. In the referenced drawings, the same or similar components in different drawings are denoted by the same reference numerals.

An outer rotor rotary vane vacuum pump directly driven by a permanent magnet synchronous motor is shown in figures 1-7 and comprises a rotary vane vacuum pump oil tank 1, vacuum pump oil is arranged inside the rotary vane vacuum pump oil tank 1, a pump body stator 12 is soaked in the vacuum pump oil, and an air inlet 43 and an air outlet 41 on the pump body stator 12 are isolated from the vacuum pump oil by an O-shaped sealing ring 19 and an oil box 6 respectively. The upper end of the oil box 6 is welded with an exhaust valve end cover 4 and fixed on the pump body stator 12 through screws, and an exhaust valve spring 5 is arranged inside the oil box 6 and tightly presses an exhaust valve plate 7. Inside pump body stator 12, high chamber rotor 8 top and the inseparable laminating of pump body stator 12, motor rotor 13 is embedded in high chamber rotor 8, ann has high chamber rotor 9 on the high chamber rotor 8, there is rotor plate spring 10 high chamber rotor plate 9 inside, and there is guide bar 11 rotor plate spring 10 inside.

The high-cavity rotor 8 is arranged in the inner wall of the pump body stator 12 and is eccentrically arranged at the top end, and the top end is tightly combined with the upper wall of the pump body stator 12 to separate an air inlet channel from an air outlet channel. One end of each side surface of the connecting rod is jointed with the high-cavity end cover 23, and the other end of each side surface of the connecting rod is jointed with the middle wall 26. The high-cavity rotor 8 is provided with a high-cavity rotary vane 9, the tail part of the high-cavity rotary vane 9 is provided with a rotary vane spring 10 for providing thrust, the head part of the high-cavity rotary vane 9 is ensured to be always connected with the inner wall of the pump body stator 12, the high-cavity rotary vane 9 moves along with the rotary head part of the high-cavity rotor 8 and is always attached to the inner wall of the pump body stator 12, and the area in the cavity of the pump body stator 12 is divided into an air inlet area, a middle area and an air exhaust area for realizing the change of the volume of gas and changing.

The outer rotor permanent magnet synchronous motor comprises a motor stator 15, a motor rotor 13, a permanent magnet 14, a central shaft 17 and a stator sleeve 16, wherein the outer side of the motor rotor 13 is embedded in the high-cavity 8 rotor in an interference fit mode, meanwhile, the permanent magnet 14 is arranged on the inner surface of the motor rotor 13, an air gap is formed between the permanent magnet 14 and the motor stator 15, a motor stator slot is formed in the motor stator 15, a stator coil winding is arranged in the motor stator slot, the motor stator 15 is externally embedded in the stator sleeve 16 in a matching mode, and the stator sleeve 16 is connected with the central shaft 17 through a key 18.

The high-cavity rotor 8, the high-cavity rotor 9 and the outer rotor permanent magnet synchronous motor are all positioned in the pump body stator 12. The upper end of the pump body stator 12 is provided with two channels of an air inlet 43 and an air outlet 41, and the outside of the pump body stator 12 is surrounded by vacuum pump oil. The inlet port passage has an O-ring 19 to block vacuum oil from entering the exhaust port. Further, the pump body stator 12 has a pillar 39, and the pillar 39 supports the oil deflector 2, and the air inlet 43 and the motor cooling passage outlet 51 penetrate the oil deflector 2.

The end cover 20 is fixed to the high-chamber end cover 23 by screws, and the high-chamber end cover 23 is fixed to one side end face of the pump body stator 12 by screws. The low-chamber end cover 37 is fixed to the other end surface of the pump body stator 12 by screws. The end of the central shaft 17 extending beyond the pump body stator 12 has a journal bearing 22 attached in mating relationship, the journal bearing 22 being supported in an end cap 20 and a high chamber end cap 23. The oil drain plug screw 31 and the oil inlet plug screw 40 are both connected to the upper end face and the side end face of the rotary-vane vacuum pump oil tank 1 through threads. The rotary-vane vacuum pump oil tank 1 is provided with a flange 45 fixed by screws to tightly press the air inlet.

One end of the cooling channel inlet 51 is communicated with the outside, the other end of the cooling channel inlet penetrates through the high-cavity end cover 23, a main path is divided into 8 pipelines which are uniformly distributed to penetrate through the sleeve of the motor stator 15, and the 8 pipelines which penetrate through the sleeve are gathered into a main path cooling channel outlet 52 which is connected with the outside.

The working principle of the external rotor rotary vane type vacuum pump directly driven by the permanent magnet synchronous motor is described below with reference to the accompanying drawings 1-7.

The outside of electric motor rotor 13 is because for interference fit relation with high chamber rotor 8, therefore the motor work back, electronic rotor 13 will directly drive high chamber rotor 8 synchronous revolution motion, again because high chamber rotor 9 keeps head and the laminating of pump body stator 12 inner wall under the effect of spiral piece spring 10 always, and high chamber rotor 8 excircle top is tangent with the 12 intracavity surfaces of pump body stator, the inside region of pump body stator 12 is divided into three airtight region, air inlet 43 department volume increase when high chamber rotor 8 moves, pressure diminishes, gaseous suction is regional to the air inlet, 41 volume reductions in gas vent simultaneously, the pressure grow, gaseous discharge, realize gaseous pressure boost.

The motor driving mode of the invention adopts an outer rotor direct driving mode, and an inner rotor motor can also be embedded in the high-cavity rotor to drive the high-cavity rotor to rotate.

The driving motor is a permanent magnet motor, but other motors can also realize the same function, but the efficiency and the like are different.

The connection mode of the motor rotor and the high-cavity rotor can be matched connection, and connection transmission can also be carried out in a sleeve mode and the like. The central shaft and the stator sleeve can also realize transmission by adopting different connection modes such as key transmission, matching relation and the like.

The cooling channel lines may also be distributed in other numbers such as 3, 4, 5, etc. that are distributed in the stator sleeve. The shape of the cooling passage pipe is not limited to a circle, and may be square, trapezoidal, or the like.

Cooling can be performed using different media, such as gas or liquid.

While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims

1. An outer rotor rotary vane vacuum pump directly driven by a permanent magnet synchronous motor comprises a rotary vane vacuum pump oil tank (1) with vacuum pump oil inside, and is characterized in that,

the pump body stator (12) is soaked in the vacuum pump oil, and an air inlet (43) and an air outlet (41) on the pump body stator (12) are isolated from the vacuum pump oil by the O-shaped sealing ring (19) and the oil box (6) respectively;

the high-cavity rotor (8) is positioned in the inner wall of the pump body stator (12) and is eccentrically arranged at the top end, and the top end is tightly combined with the upper wall of the pump body stator (12) to separate two channels of an air inlet (43) and an air outlet (41);

one end of a cooling channel inlet (51) is communicated with the outside, the other end of the cooling channel inlet penetrates through the high-cavity end cover (23), a main path is divided into 8 pipelines which are uniformly distributed to penetrate through a sleeve of the motor stator (15), and the 8 pipelines which penetrate through the sleeve are gathered into a main path which is connected with the outside through a cooling channel outlet (52).

2. The outer rotor rotary vane vacuum pump directly driven by the permanent magnet synchronous motor according to claim 1, wherein an exhaust valve end cover (4) is welded to the upper end of the oil box (6) and fixed on a pump body stator (12) through a screw, and an exhaust valve spring (5) is arranged inside the oil box (6) and compresses an exhaust valve plate (7); high chamber rotor (8) top and pump body stator (12) of pump body stator (12) inside closely laminate, embedded in high chamber rotor (8) motor rotor (13), ann has high chamber rotor (9) on high chamber rotor (8), high chamber rotor (9) inside is provided with rotor spring (10), inside guide bar (11) that is provided with of rotor spring (10).

3. The outer rotor rotary vane vacuum pump directly driven by the permanent magnet synchronous motor according to claim 1, wherein the outer rotor permanent magnet synchronous motor comprises a motor stator (15), a motor rotor (13), a permanent magnet (14), a central shaft (17) and a stator sleeve (16), the outer side of the motor rotor (13) is embedded in the high-cavity rotor (8) through interference fit, the permanent magnet (14) is arranged on the inner surface of the motor rotor (13), an air gap is formed between the permanent magnet (14) and the motor stator (15), a motor stator slot is formed in the motor stator (15), a stator coil winding is arranged in the motor stator slot, the motor stator (15) is embedded in the stator sleeve (16) through matching, and the stator sleeve (16) is connected with the central shaft (17) through a key (18).

4. The outer rotor rotary vane vacuum pump directly driven by the permanent magnet synchronous motor according to claim 3, wherein the end cover (20) is fixed on the high cavity end cover (23) through a screw, the high cavity end cover (23) is fixed on one side end face of the pump body stator (12) through a screw, and the low cavity end cover (37) is fixed on the other end face of the pump body stator (12) through a screw; the end of the central shaft (17) extending out of the pump body stator (12) is connected with a sliding bearing (22) through a matching relation, and the sliding bearing (22) is supported in an end cover (20) and a high cavity end cover (23).

5. The outer rotor rotary vane vacuum pump directly driven by the permanent magnet synchronous motor as claimed in claim 1, wherein the oil drain plug screw (31) and the oil inlet plug screw (40) are both connected to the upper end face and the side end face of the rotary vane vacuum pump oil tank (1) through threads, and a flange (45) fixed through screws is arranged on the rotary vane vacuum pump oil tank (1) to tightly press the air inlet (43).