CN107733163B

CN107733163B - Motor, centrifugal compressor and air conditioning unit

Info

Publication number: CN107733163B
Application number: CN201711077728.4A
Authority: CN
Inventors: 刘增岳; 钟瑞兴; 陈玉辉; 蒋楠; 刘建飞; 蒋彩云; 周义; 雷连冬
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2017-11-06
Filing date: 2017-11-06
Publication date: 2020-06-16
Anticipated expiration: 2037-11-06
Also published as: CN107733163A

Abstract

The invention discloses a motor, a centrifugal compressor and an air conditioning unit, wherein the motor comprises: the inner wall is equipped with the barrel of round installation step, the cover is at the stator in the installation step inner circle, locate in the stator and can follow self axis pivoted rotor, the region that is located the stator front end in the barrel is preceding chamber, the region that is located the stator rear end is the back chamber, be equipped with the refrigerant import with preceding chamber intercommunication on the barrel, the return-air port with the back chamber intercommunication, preceding chamber passes through the clearance intercommunication back chamber between stator and the rotor, the ring is kept off to the rear end of stator is installed, keep off the ring and keep off on the rear end face of installation step, it is isolated with the back chamber with the clearance between stator and the barrel. The invention has the advantages of simple structure, capability of preventing the refrigerant from leaking, improvement of the assembly efficiency and the like.

Description

Motor, centrifugal compressor and air conditioning unit

Technical Field

The invention relates to the technical field of motor structures, in particular to a motor, a centrifugal compressor and an air conditioning unit.

Background

When the centrifugal compressor normally operates, the motor can generate heat under the power-on state and is a main heating element, if the heat is not taken away in time, the coil temperature of the motor can be continuously increased, the magnetic field characteristic can be changed, the performance of the compressor can be greatly reduced, and when the coil temperature is higher than the limit value of coil insulation, the coil insulation can be damaged, and the compressor can not normally operate.

In order to ensure the normal operation of the compressor and prevent the motor from faults such as coil insulation damage, rotor demagnetization and the like due to overhigh temperature. At present centrifugal compressor independently cools off the motor, liquid refrigerant gets into through motor one end promptly, traditional motor cooling structure, as shown in fig. 1, refrigerant import 12 is more close with the rear chamber 5 distance of motor, because reasons such as stator 2 surface welding and polishing, there are some clearances between stator 2 and barrel 1, lead to the liquid refrigerant directly to arrive rear chamber 5 through this clearance from refrigerant import 12 and discharge through return-air port 13, can't effectively take away motor calorific capacity, lead to the motor cooling bad, the compressor safe and reliable performance is relatively poor. And, the stator axial locating surface of traditional motor is at the front end, and does not have corresponding locating surface on barrel 1, consequently needs the location frock to fix a position stator 2 at the front end. Meanwhile, when the stator 2 is arranged in the cylinder body 1, the axial positioning often needs a positioning tool, so that the assembly efficiency is low.

Therefore, how to design a motor with simple structure, capable of preventing the refrigerant leakage and improving the assembly efficiency is an urgent technical problem to be solved in the industry.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a motor, a centrifugal compressor and an air conditioning unit.

The technical scheme adopted by the invention is that a motor is designed, and the motor comprises: the inner wall is equipped with the barrel of round installation step, the cover is at the stator in the installation step inner circle, locate in the stator and can follow self axis pivoted rotor, the region that is located the stator front end in the barrel is preceding chamber, the region that is located the stator rear end is the back chamber, be equipped with the refrigerant import with preceding chamber intercommunication on the barrel, the return-air port with the back chamber intercommunication, preceding chamber passes through the clearance intercommunication back chamber between stator and the rotor, the ring is kept off to the rear end of stator is installed, keep off the ring and keep off on the rear end face of installation step, it is isolated with the back chamber with the clearance between stator and the barrel.

The part of the baffle ring close to the inner ring is attached to the rear end face of the stator and is fixed on the rear end face of the stator through screws. The part of the baffle ring close to the outer ring is attached to the rear end face of the mounting step. The refrigerant inlet is positioned on the barrel body and close to the rear cavity, the air return port is arranged on the cavity wall of the rear cavity, and the refrigerant inlet and the air return port are separated on two sides of the baffle ring.

The inner wall of the mounting step is also provided with a refrigerant flow channel, one end of the refrigerant flow channel is connected with the refrigerant inlet, and the other end of the refrigerant flow channel is connected with the front cavity.

Preferably, the refrigerant flow channel is spirally distributed along the inner wall of the mounting step.

Preferably, the refrigerant inlet is arranged at the bottom of the cylinder.

The invention also provides a centrifugal compressor which comprises the motor.

The invention also provides an air conditioning unit which comprises a condenser, an economizer, an evaporator and the centrifugal compressor, wherein the condenser or the economizer is connected with the refrigerant inlet, and the evaporator is connected with the air return port.

Compared with the prior art, the invention has the following beneficial effects:

1. the baffle ring at the end part of the stator isolates the gap between the stator and the cylinder from the rear cavity, so that the refrigerant is prevented from directly reaching the rear cavity through the gap and leaking through the return air port, and the running stability of the compressor is improved;

2. when the stator is installed, the baffle ring can abut against the rear end face of the installation step in the cylinder body, the end face of the baffle ring is directly used as an axial assembly positioning face of the stator, an axial positioning tool at the front end of the cylinder body in the existing motor assembly is omitted, and the assembly efficiency is improved.

Drawings

The invention is described in detail below with reference to examples and figures, in which:

fig. 1 is a schematic cross-sectional view of an internal structure of a motor in the related art;

fig. 2 is a schematic sectional view of the internal structure of the motor of the present invention.

Detailed Description

As shown in fig. 2, the present invention proposes a motor including: barrel 1, stator 2 and rotor 3, the inner wall of barrel 1 is equipped with the convex installation step 11 of round, and stator 2 cover is in the inner circle of installation step 11, and the activity of rotor 3 is located in stator 2, and rotor 3 can rotate along self axis, and the region that lies in 2 front ends of stator in barrel 1 is preceding chamber 4, the region that lies in 2 rear ends of stator is rear chamber 5, and preceding chamber 4 passes through clearance intercommunication rear chamber 5 between stator 2 and the rotor 3. The barrel 1 is provided with a refrigerant inlet 12 and a return air port 13, the return air port 13 is arranged on the wall of the rear cavity 5, and the refrigerant inlet 12 is positioned on the barrel 1 and close to the rear cavity 5 and is communicated with the front cavity 4 through a refrigerant flow passage 14. The refrigerant flow channel 14 is arranged on the inner wall of the mounting step 11, one end of the refrigerant flow channel is connected with the refrigerant inlet 12, the other end of the refrigerant flow channel is connected with the front cavity 4, and in order to ensure that liquid refrigerant can sufficiently absorb heat in the flowing process, the refrigerant flow channel 14 is spirally distributed along the inner wall of the mounting step 11.

The rear end of the stator 2 is provided with a baffle ring 6, the baffle ring 6 is blocked on the rear end surface of the mounting step 11 to separate the refrigerant inlet 12 and the return air port 13 at two sides, and the part of the baffle ring 6 close to the inner ring is attached to the rear end surface of the stator 2 and is fixed on the rear end surface of the stator 2 through screws. The part of the baffle ring 6 close to the outer ring is attached to the rear end face of the installation step 11. When the mounting structure is used, the retaining ring 6 is fixed on the stator 2, and then the stator 2 is sleeved into the cylinder 1, so that the retaining ring 6 is attached to the end face of the mounting step 11. Can be isolated with the back chamber with the clearance between stator 2 and barrel 1 through keeping off ring 6, liquid refrigerant can't reach back chamber 5 through this clearance after getting into from refrigerant import 12, can only reach front chamber 4 along refrigerant runner 14 to take away the heat of stator 2 and rotor 3, moreover, the terminal surface that keeps off ring 6 can also regard as the axial assembly locating surface of stator 2, need not to set up the location frock in addition during stator 2 installation, improves assembly efficiency, reduce cost.

When the liquid refrigerant evaporator is used, liquid refrigerant enters the refrigerant flow channel 14 from the refrigerant inlet 12 and reaches the front cavity 4 through the refrigerant flow channel 14, the liquid refrigerant absorbs heat of the stator 2 and the rotor 3 in the flowing process and evaporates into a gas state, and the gas refrigerant returns to the rear cavity 5 through a gap between the stator 2 and the rotor 3 and finally flows out of the air return port 13.

The invention also provides a centrifugal compressor which comprises the motor.

The invention also provides an air conditioning unit, comprising: the condenser or the economizer is connected with a refrigerant inlet 12, the evaporator is connected with an air return port 13, liquid refrigerants are introduced from the condenser or the economizer by the refrigerant inlet 12 when the condenser or the economizer is used, and the liquid refrigerants absorb heat and are evaporated into gas states and then flow out of the air return port 13 to return into the evaporator.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An electric machine comprising: the rotor-type motor rotor comprises a cylinder body (1) with a circle of convex mounting steps (11) on the inner wall, a stator (2) sleeved in the inner ring of the mounting steps (11), and a rotor (3) rotatably arranged in the stator (2), wherein a front cavity (4) is arranged in the cylinder body (1) at the front end of the stator (2), a rear cavity (5) is arranged in the rear end of the stator (2), a refrigerant inlet (12) communicated with the front cavity (4) and a return air port (13) communicated with the rear cavity (5) are arranged on the cylinder body (1), the front cavity (4) is communicated to the rear cavity (5) through a gap between the stator (2) and the rotor (3), and the rotor-type motor rotor is characterized in that a baffle ring (6) is mounted at the rear end of the stator (2), the baffle ring (6) is positioned on the rear end face of the mounting steps (11), and the part, close to the inner ring, on the baffle ring (6) is attached to the rear end face of, the part of the baffle ring (6) close to the outer ring is attached to the rear end face of the mounting step (11), and a gap between the stator (2) and the cylinder body (1) is isolated from the rear cavity (5);

a refrigerant flow channel (14) is arranged on the inner wall of the mounting step (11), one end of the refrigerant flow channel (14) is connected with the refrigerant inlet (12), and the other end of the refrigerant flow channel is connected with the front cavity (4);

the refrigerant inlet (12) is positioned on the barrel (1) and close to the rear cavity (5), the air return port (13) is arranged on the cavity wall of the rear cavity (5), and the refrigerant inlet (12) and the air return port (13) are separated on two sides of the baffle ring (6).

2. The motor according to claim 1, wherein the coolant channel (14) is spirally distributed along the inner wall of the mounting step (11).

3. The electrical machine according to claim 1, wherein the coolant inlet (12) is provided at the bottom of the cylinder (1).

4. An electric machine according to claim 1, characterized in that the stop ring (6) is fixed to the rear end face of the stator (2) at a location close to the inner ring.

5. A centrifugal compressor comprising an electric machine according to any one of claims 1 to 4.

6. An air conditioning assembly comprising a centrifugal compressor according to claim 5.

7. The air conditioning assembly as set forth in claim 6, further comprising: the condenser or the economizer is connected with the refrigerant inlet (12), and the evaporator is connected with the air return port (13).