CN113864150A

CN113864150A - Linear compressor based on gas bearing

Info

Publication number: CN113864150A
Application number: CN202111224159.8A
Authority: CN
Inventors: 刘政; 任道顺
Original assignee: Shanghai Langdan Technology Group Co Ltd
Current assignee: Shanghai Langdan Technology Group Co Ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2021-12-31

Abstract

The invention designs a linear compressor based on a gas bearing for a refrigerator and an air-conditioning refrigeration system, which consists of a cylinder, a linear motor, a rotor piston, a plate spring, a suction valve, an exhaust valve and an exhaust cavity. The cylinder is internally provided with a communicating hole and a gas spraying hole which are communicated with the exhaust cavity, so that gas supporting force is provided for the rotor piston, and the rotor piston is prevented from contacting with the inner wall of the cylinder. The linear motor is composed of an inner yoke, an outer yoke, a coil support and a coil and provides axial driving force for the rotor piston. The plate spring is connected with the rotor piston through the permanent magnet support to provide radial supporting force and axial spring force for the rotor piston. Linear compressor based on gas bearing can avoid active cell piston and cylinder inner wall to take place the contact, reduces the friction loss, does not need lubricating oil to lubricate simultaneously, does not have oil returning device for compressor efficiency is higher, and the volume is littleer, can arbitrary angle place and work under various environment.

Description

Linear compressor based on gas bearing

Technical Field

The invention relates to refrigeration of a refrigerator and an air conditioner, in particular to a linear compressor based on a gas bearing for a refrigeration system of the refrigerator and the air conditioner.

Background

According to statistics, the energy consumption of the air conditioner in summer in China accounts for 17% of the total energy consumption, and the common household refrigerator consumes about half of the total electricity consumption of the resident household. The compressor is the most important energy consumption component, and accounts for more than 80% of the refrigerator consumed power. Therefore, the improvement of the energy-saving level of the compressor for the refrigerator is significant for solving the problem of energy shortage. Under the background, the linear compressor with high efficiency and energy conservation becomes the key point of the current domestic and overseas research.

The moving magnet type linear compressor is simple in structure, does not have a crank connecting rod mechanism, is driven by a linear motor, the electromagnetic driving force direction of the linear motor is always the same as the axial direction of a piston, and the radial force and the friction force of the piston are small. The linear compressor utilizes the plate spring as a support, provides the axial stiffness and the radial stiffness required by the reciprocating motion of the piston, ensures the clearance sealing of the piston and the cylinder, and does not need lubricating oil for lubrication and sealing. The oil-free lubrication can reduce the pollution of the lubricating oil to the refrigerant, and the phenomenon that the lubricating oil is attached to the pipe wall of the heat exchanger to influence the heat exchange efficiency is avoided; the compressor can be placed in any direction, the influence of gravity on the oil return of the compressor is not required to be considered, and the compressor can be applied to the fields of household air conditioners and household refrigerators in various environments.

Disclosure of Invention

The invention aims to provide a linear compressor based on a gas bearing for a refrigerator and an air-conditioning refrigeration system, which can improve the energy-saving level of the compressor for the refrigerator and the air conditioner.

The purpose of the invention is realized by the following structural design.

The invention relates to a linear compressor for realizing lubrication by utilizing a gas bearing technology, which mainly comprises a cylinder, a linear motor, a rotor piston, a plate spring, an air suction valve, an exhaust valve and an exhaust cavity. The method is characterized in that: the air cylinder is characterized in that 8 air injection holes are distributed on the upper portion and the lower portion of the inner wall of the air cylinder and communicated with the exhaust cavity, after the rotor piston compresses a refrigerant working medium, the high-temperature and high-pressure refrigerant working medium enters the exhaust cavity through the exhaust hole and the exhaust valve in the air cylinder, most of the working medium enters the refrigerating system to continue to circulate, a small portion of the working medium is injected to the groove on the surface of the rotor piston through the air injection holes to form an air film and provide supporting force, and the piston is guaranteed not to be in contact with the inner wall of the air cylinder. The rotor piston is of a hollow structure, 8 grooves are uniformly distributed in the upper portion and the lower portion of the surface of the rotor piston, 4 vent holes are distributed in the root of the rotor piston, an air suction butterfly valve is installed on one side of the rotor piston and arranged inside the air cylinder, and the other side of the rotor piston is connected with the permanent magnet support. The inner wall of the permanent magnet support is provided with 8 tile-shaped permanent magnets which are arranged in the linear motor, one side of each permanent magnet support is connected with the rotor piston, and the other side of each permanent magnet support is connected with the plate spring. The plate spring is connected with a support outside the cylinder, and provides radial supporting force and axial spring force for the rotor piston and the permanent magnet support. The linear motor comprises an inner yoke, an outer yoke, a coil and a coil bracket, wherein the inner yoke is integrated, two ends of the inner yoke are respectively provided with 20 gaps of 0.2mm, and the inner yoke is glued on the outer wall of the cylinder; the outer yoke is in a C-shaped laminated type with inward teeth and is arranged at two ends of the coil support; copper coils are wound in the coil support. When the copper coil is electrified with alternating current, an induced magnetic field generated by the copper coil can interact with a constant magnetic field generated by the permanent magnet, so that the rotor piston is pushed to reciprocate, and a refrigerant working medium is compressed.

The design advantages of the invention are as follows: the linear compressor adopts a gas bearing technology to replace the traditional gap sealing technology, so that the rotor piston is ensured not to contact and rub with the inner wall of the cylinder in the operation process, and the energy loss is reduced; lubricating oil is not needed for lubrication and sealing, so that the pollution of the lubricating oil to the refrigerant can be reduced, and the phenomenon that the lubricating oil is attached to the pipe wall of the heat exchanger to influence the heat exchange efficiency is avoided; without a crank-link mechanism and an oil return system, the linear compressor is smaller and more compact.

Drawings

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

FIG. 2 is a schematic view of a linear motor of the present invention;

fig. 3 is a schematic view of the mover piston of the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the following embodiments are combined with the accompanying drawings to specifically describe the linear compressor based on the gas bearing for the refrigeration system of the refrigerator and the air conditioner.

As shown in fig. 1, 2 and 3, a linear compressor based on a gas bearing for a refrigeration system of a refrigerator and an air conditioner includes a cylinder 1, a casing 2, a linear motor 3, a plate spring 5, a mover piston 7, a permanent magnet 8, a permanent magnet holder 9, a suction valve 11, an exhaust valve 12 and a lift limiter 13. 8 gas injection holes 9 are uniformly distributed on the upper portion and the lower portion of the inner wall of the cylinder 1 and are connected with an exhaust cavity 14 through communication holes 10, high-temperature and high-pressure refrigerant working media in the exhaust cavity are sprayed in a gas receiving counter bore 702 on the surface of the rotor piston 7 through the communication holes 10 and the gas injection holes 9 to form a gas film, and the rotor piston 7 can be prevented from contacting with the inner wall of the cylinder 1. As shown in fig. 3, 8 air-receiving counter bores 702 are uniformly distributed on the upper and lower surfaces of the

mover piston

7, 4 air-suction through holes 704 are distributed at the root, the mover piston 7 adopts a through structure, refrigerant working medium enters the interior of the cylinder 1 through the air-suction through holes 703 to be compressed, air-suction valve threaded holes 701 are distributed on one side of the mover piston 7 and connected with the air-suction valve 12, and permanent magnet support connecting threaded holes 704 are formed on the other side of the mover piston and connected with the permanent magnet support 6. The inner wall of the permanent magnet support 6 is distributed with 8 tile-shaped permanent magnets 9, the permanent magnets are positioned in the center of the linear motor 3 when the permanent magnet support is static, one end of the permanent magnet support 6 is connected with the plate spring 5, the plate spring 5 is connected with a support outside the cylinder 1, and radial supporting force and axial spring force are provided for the rotor piston 7.

The linear motor 3 comprises an inner yoke 301, an outer yoke 302, a coil support 303 and a coil 304, wherein the inner yoke 301 is integral, 20 gaps with the thickness of 0.2mm are uniformly distributed at the upper part and the lower part of the inner yoke for reducing iron loss in the linear motor, and the inner yoke is glued on the outer wall of a cylinder. The outer yoke 302 is in a C-lamination type with inward teeth and is mounted on both sides of the coil support 303. Copper coils 304 are wound in the coil supports 303, and after alternating current is conducted in the copper coils 304, the generated induced magnetic field can interact with the constant magnetic field of the permanent magnets 8, so that the rotor piston 7 is pushed to reciprocate, and a refrigerant working medium is compressed.

The suction valve 11 is opened during the suction of the compressor and closed for the rest. The exhaust valve 12 is opened during the compressor discharge, and its lift is limited by a lift limiter 13, and the rest is closed.

The linear compressor based on the gas bearing and composed of the structural components adopts the gas bearing, so that the frictional contact between the piston and the cylinder can be well avoided, and the friction loss is reduced; meanwhile, the use of lubricating oil is avoided, the pollution of refrigerant and the scaling of the lubricating oil are avoided, an oil return system is reduced, and compared with the traditional compressor, the compressor has higher performance and smaller volume.

According to the linear compressor based on the gas bearing, alternating current (120 Hz and 150V) is firstly conducted in a copper coil of a linear motor, the copper coil can generate an induction magnetic field at the moment, the induction magnetic field is further enhanced under the action of an inner magnetic yoke and an outer magnetic yoke, the induction magnetic field interacts with a constant magnetic field of a permanent magnet to push a rotor piston to reciprocate, and a refrigerant working medium is compressed. Refrigerant working medium enters an air suction pipeline from an evaporator of the refrigerating system and enters a shell of the linear compressor through the air suction pipeline, the linear motor is cooled through the linear motor, and then the refrigerant enters the piston through an air suction through hole at the root of the piston. When the compressor is in the air suction process, the pressure in the air cylinder is lower than the air suction pressure, the air suction valve is opened at the moment, and the working medium enters the air cylinder; when the compressor performs a compression process, the working medium is compressed in the cylinder, the pressure begins to increase, and the suction valve is closed at the moment; when the pressure of the working medium is compressed to exceed the condensing pressure, the compressor enters an exhaust process, an exhaust valve is opened due to the pressure difference on two sides, the high-temperature and high-pressure working medium flows out of an exhaust hole in the top of the cylinder and enters an exhaust cavity, a part of the working medium is sprayed into an air receiving counter bore on the surface of the piston through a communication hole and an air injection hole in the cylinder to form an air film, supporting force is provided, the rotor piston is prevented from contacting with the inner wall of the cylinder, and the other part of the working medium enters an exhaust pipeline to continue to circulate; when the compressor enters the expansion process, the pressure inside the cylinder starts to decrease and the exhaust valve is closed.

The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.

Claims

1. The utility model provides a linear compressor based on gas bearing, includes cylinder (1), casing (2), linear electric motor (3), leaf spring (5), active cell piston (7), suction valve (11) and discharge valve (12), its characterized in that: the air compressor is characterized in that 8 air injection holes (9) are distributed in the upper portion and the lower portion of the inner wall of the air cylinder (1), the air injection holes (9) are connected with the exhaust cavity (14) and the air cylinder (1) through communicating holes (10), the rotor piston (7) compresses refrigerant working media in the air cylinder (1), the compressed high-temperature and high-pressure refrigerant working media enter the exhaust cavity (14) through an exhaust valve (12), one part of the refrigerant working media enter the air cylinder (1) through the communicating holes (10) and the air injection holes (9) and are sprayed on the surface of the rotor piston (7), and the other part of the refrigerant working media enter a refrigerating system to circulate.

2. The gas bearing based linear compressor of claim 1, wherein: the rotor piston (7) is of a hollow structure, 4 air-receiving counter bores (702) are distributed on the upper portion and the lower portion of the surface of the rotor piston (7) and correspond to air injection holes (9) in the inner wall of the air cylinder (1), 4 air suction through holes (703) are distributed at the root portion of the rotor piston (7), an air suction valve (11) is distributed at one end of the rotor piston (7) and connected with the air cylinder (1), and the other end of the rotor piston (7) is connected with the permanent magnet support (6).

3. The gas bearing based linear compressor of claim 1, wherein: an inner yoke (301) in the linear motor (3) is integrated, 20 slits are respectively distributed on the upper side and the lower side of the inner yoke (301), the inner yoke (301) is glued on the outer wall of the cylinder (1), an outer yoke (302) in the linear motor (3) is in a C-shaped laminated type and is arranged on the upper side and the lower side of a coil support (303) in an interference fit mode, an outer yoke pressing plate (4) is fixed on a base of the cylinder (1), and a copper coil (304) is wound inside the coil support (303).

4. A permanent magnet holder (6) according to claim 2, characterized in that: the inner side of the permanent magnet bracket (6) is distributed with 8 tile-shaped permanent magnets (8), the root of the permanent magnet bracket (6) is distributed with through holes, and one side of the permanent magnet bracket (6) is connected with the plate spring (5).

5. The gas bearing based linear compressor of claim 1, wherein: the plate spring (5) adopts an Archimedes profile, and the plate spring (5) is connected with a support of the cylinder (1) to provide radial supporting force and axial spring force for the rotor piston (7).

6. The gas bearing based linear compressor of claim 1, wherein: the air suction valve (11) is a butterfly valve, is arranged on one side of the rotor piston (7) connected with the air cylinder (1), and is opened in the air suction process.

7. The gas bearing based linear compressor of claim 1, wherein: the exhaust valve adopts a reed valve (12), the middle valve plate of the exhaust valve (12) is connected with a beam arm of a plate-like spring at the root of the valve, and the beam arm is of an Archimedes profile and is arranged on a valve seat of an exhaust cavity (14).