CN109653987B

CN109653987B - Linear compressor with oil supply device

Info

Publication number: CN109653987B
Application number: CN201811492386.7A
Authority: CN
Inventors: 孙浩议; 李衡国
Original assignee: Tianjin Tanfeng Technology Co ltd
Current assignee: Tianjin Tanfeng Technology Co ltd
Priority date: 2018-12-07
Filing date: 2018-12-07
Publication date: 2020-06-02
Anticipated expiration: 2038-12-07
Also published as: CN109653987A

Abstract

A linear compressor with an oil supply device. It comprises a housing; lubricating oil stored in the bottom of the housing; the linear motor and the cylinder are fixed in the shell, wherein the linear motor is composed of a stator, a coil and a permanent magnet; a piston driven by a linear motor and linearly reciprocating in the cylinder; a rotor frame connecting the permanent magnet on the linear motor and the piston; a stator spring plate fixed to the stator; the resonant spring is connected between the rotor framework and the stator spring plate; the method is characterized in that: the linear compressor with the oil supply device also comprises an oil supply device; the oil supply device comprises an oil cylinder fixed on the stator spring plate; an oil mover movably disposed in the oil cylinder; and the oil spring is sleeved outside the oil cylinder and used for elastically supporting the oil mover. The invention has the following effects: simple structure and convenient installation. The work is stable, and the operation reliability of the linear compressor is improved.

Description

Linear compressor with oil supply device

Technical Field

The invention belongs to the technical field of compression machinery, and particularly relates to a linear compressor with an oil supply device.

Background

A linear compressor is a device that compresses and discharges gas sucked into a cylinder by reciprocating a piston using a linear motor. Compared with the traditional reciprocating compressor, the linear compressor with the oil supply device eliminates the structure of a crankshaft connecting rod, reduces the number of transmission structures and simultaneously reduces the friction among all transmission components. However, there is still a friction surface between the piston and the cylinder, and in order to ensure the reliability of the operation of the linear compressor, it is also generally required to supply the lubricating oil between the piston and the cylinder through an oil supply device.

Fig. 1 is a longitudinal structural sectional view of a prior art linear compressor with an oil supply device. As shown in fig. 1, it comprises a shell, the bottom of which is provided with lubricating oil; the main pump body comprises a linear motor, a cylinder and a piston and is arranged in the shell in a vibratile mode through a shock absorber; and the oil supply device is arranged at the lower part of the main pump body and comprises an oil piston and an oil cylinder. When the linear compressor with the oil supply device works, the linear motor drives the piston to do linear reciprocating motion in the cylinder, so that the processes of sucking, compressing and discharging gas are realized. Meanwhile, the linear motor and the cylinder can vibrate along with the piston, and the vibration of the main pump body can be transmitted to the oil supply device, at the moment, the oil piston is supported in the oil cylinder through the oil springs on the two sides to perform linear reciprocating motion, so that the lubricating oil is inertially sucked and discharged along with the reciprocating motion of the oil cylinder.

As can be seen from the above description, the power of the oil supply device in the prior art linear compressor with the oil supply device is mainly derived from the vibration of the main pump body. However, for a linear compressor with an oil supply device in which the main pump body vibrates little, the oil supply device is not suitable.

To solve the above problem, chinese patent No. CN108457810A proposes a solution. Two springs with different elastic stiffness, namely a weak spring and a strong spring, are arranged on two sides of an oil mover of the oil supply device, wherein the elastic stiffness of the weak spring is smaller than that of the strong spring. The compressor rotor is connected with the oil pump rotor through the weak spring, so that vibration of the compressor rotor is transmitted to the oil pump rotor, and power is provided for the oil pump. However, this type of oil supply device has the following problem, and as is apparent from the above description, the operating stroke of the weak spring is equal to the compressor mover stroke — the oil pump mover stroke. As is well known, the stroke of the oil pump mover is very small relative to the motion stroke of the compressor mover, so the working stroke of the weak spring is almost the same as the compressor mover stroke, however, the elastic stiffness of the weak spring is much smaller than that of the compressor resonant spring, so that the weak spring has a large amount of nonlinear motion, i.e. high resonant motion, during the actual operation of the compressor. A large amount of high-resonance vibration is transmitted to an oil pump rotor to cause unstable oil supply of an oil pump, occasionally, phenomena such as insufficient oil supply or excessive oil supply occur, and therefore abrasion between a compressor piston and an air cylinder and performance reduction of the compressor are caused, and reliability of operation of the compressor is affected.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a linear compressor with an oil supply device having a simple structure and stable operation.

In order to achieve the above object, the present invention provides a linear compressor with an oil supply device including a casing; lubricating oil stored in the bottom of the housing; the linear motor and the cylinder are fixed in the shell, wherein the linear motor is composed of a stator, a coil and a permanent magnet; a piston driven by a linear motor and linearly reciprocating in the cylinder; a rotor frame connecting the permanent magnet on the linear motor and the piston; a stator spring plate fixed to the stator; the resonant spring is connected between the rotor framework and the stator spring plate; the method is characterized in that: the linear compressor with the oil supply device also comprises an oil supply device; the oil supply device comprises an oil cylinder fixed on the stator spring plate; an oil mover movably disposed in the oil cylinder; and the oil spring is sleeved outside the oil cylinder and used for elastically supporting the oil mover.

And a gap is formed between the oil rotor and the rotor framework.

The oil supply device further comprises a soft gasket arranged on one side, close to the rotor framework, of the oil rotor.

The oil supply device also comprises an oil mover baffle arranged inside the shell.

The linear compressor with the oil supply device provided by the invention has the following beneficial effects: 1. simple structure and convenient installation. 2. The work is stable, and the operation reliability of the linear compressor is improved.

Drawings

Fig. 1 is a longitudinal structural sectional view of a prior art linear compressor with an oil supply device.

Fig. 2 is a longitudinal structural sectional view of a linear compressor with an oil supply device provided in chinese patent No. CN 108457810A.

Fig. 3 is a longitudinal structural sectional view of the linear compressor with the oil supply device according to the present invention.

Detailed Description

The present invention provides a linear compressor with an oil supply device, which will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 3, the present embodiment provides a linear compressor with an oil supply device including: a casing 00, the left side of which is provided with a suction inlet and the right side is provided with a discharge outlet; lubricant O stored in the bottom of housing 00; a linear motor 30 disposed inside the right side of the housing 00 and including a stator 31, a coil 33, a first permanent magnet 32a, and a second permanent magnet 32 b; the stator 31 is annular, an annular space is arranged in the stator 31, an annular gap communicated with the annular space is formed in the middle of the left end of the stator, and the outer circumferential surface of the stator 31 is fixed on the inner circumferential surface of the shell 00; the coil 33 is installed in the annular space of the stator 31; the first permanent magnet 32a and the second permanent magnet 32b are connected with each other and then arranged in the annular gap of the stator 31 in a manner of moving left and right; a cylinder 21 having an outer circumferential surface fixed to an inner circumferential surface of the stator 31; an exhaust valve 22 provided at an exhaust port at the right end of the cylinder 21 for opening or closing the exhaust port; an exhaust spring 23 connected between the exhaust valve 22 and the upper exhaust port of the housing 00 for opening or closing the exhaust valve 22; a piston 11 movably disposed in the cylinder 21, and having a left end connected to the first and second

permanent magnets

32a and 32b via the mover frame 13, so as to be linearly reciprocated in the cylinder 21 by the driving of the linear motor 30, thereby sucking and compressing gas; an air suction valve 12 provided at an air suction port on a right end surface of the piston 11 for opening and closing the air suction port; a stator spring plate 34 of an annular structure fixed to the left end surface of the stator 31; a resonant spring 14 as an elastic member interposed between the stator spring plate 34 and the mover frame 13; an oil supply device 40 for supplying the lubricating oil O at the bottom of the housing 00 into the gap between the piston 11 and the cylinder 21, which includes an oil pump, an oil suction valve 51, an oil discharge valve 52, an oil suction passage 5a, and an oil discharge passage 5 b; wherein the oil pump comprises an oil cylinder 42, an oil mover 41, a soft gasket 43, an oil spring 45 and an oil mover baffle 44; the right end of the oil cylinder 42 extends outwards along the radial direction to form an edge, the upper part of the edge is fixed at the lower part of the stator spring plate 34, and the oil cylinder 42 is provided with an oil suction valve 51 and an oil discharge valve 52 for sucking and discharging lubricating oil O; the oil mover 41 is composed of a left end face and an oil mover main body with one end connected to the middle of the left end face, the lower edge of the left end face extends rightwards and then downwards to form a blocking edge, and the oil mover main body is movably arranged in the oil cylinder 42; the soft gasket 43 is fixed on the outer side surface of the left end face of the oil mover 41 and used for reducing impact and noise when the mover framework 13 is in contact with the oil mover 41; the lower end of the oil mover shutter 44 is fixed to the lower inner circumferential surface of the housing 00, and the upper end thereof can contact the upper edge of the oil mover 41 and serves as a bottom dead center when the oil mover 41 moves to the left; as can be seen from the above description, the stroke Ao of the oil mover 41 is Ac-h, where Ac is the distance from the mounting position of the piston 11 to the top dead center of the operation, and h is the distance from the mounting position of the mover frame 13 to the mounting position of the soft pad 43. The oil spring 45 is sleeved outside the oil cylinder 42, and two ends of the oil spring respectively abut against the left end surface of the oil rotor 41 and the edge of the oil cylinder 42 to elastically support the oil rotor 41; the oil suction passage 5a is formed by a gap between the lower portion of the right end of the oil cylinder 42 and the stator spring plate 34, and the lower portion is immersed in the lubricating oil 0 and communicates with the inside of the oil cylinder 42, and the lubricating oil O is fed into the oil cylinder 42 by opening and closing the oil suction valve 51; an oil discharge passage 5b is formed in the stator 31, one end of which communicates with the inside of the cylinder 42 and the other end of which opens into the gap between the cylinder 21 and the piston 11, and the lubricating oil O in the cylinder 42 is sent into the gap between the cylinder 21 and the piston 11 by opening and closing of an oil discharge valve 52.

The elastic stiffness of the oil spring 45 is much smaller than that of the resonance spring 14.

The operation of the linear compressor with the oil supply device provided in the present embodiment will now be described as follows:

when an alternating current is supplied to the stator coil 33, a magnetic field will be generated in the annular gap of the stator 31. Because the supplied current is alternating current, the polarity of the magnetic field of the alternating current changes periodically, so that the first permanent magnet 32a and the second permanent magnet 32b drive the piston 11 to perform linear reciprocating motion on the inner surface of the cylinder 21 through the rotor frame 13 at the same frequency as the supplied current. At this time, the gas to be compressed is introduced into the interior of the cylinder 21 through the opened suction valve 12 and compressed by the piston 11. Wherein the suction valve 12 is opened and closed by a difference in internal and external pressures generated by the reciprocation of the piston 11. When the pressure in the cylinder 21 reaches a certain value, the exhaust valve 22 is opened by compressing the exhaust spring 23, and the compressed high-pressure gas is discharged through the discharge port of the housing 00. When the mover frame 13 moves rightward, after a certain distance h, the mover frame will contact the soft gasket 43 on the oil mover 41, so as to drive the oil mover 41 to move rightward together, thereby compressing the oil spring 45. When the piston 11 moves to the top dead center, the stroke of the oil mover 41 reaches the maximum, and thus the mover frame 13 and the oil mover 41 start to move leftward together by the restoring force of the oil spring 45, and the oil mover 41 and the mover frame 13 are separated by a certain distance Ao. The mover frame 13 continues to move leftward, and the oil mover 41 is stopped by the oil mover stop 44. In this reciprocating manner, the oil mover 41 linearly reciprocates in the cylinder 42 at the same frequency as the mover frame 13.

When the oil mover 41 moves to the left, the pressure in the oil cylinder 42 decreases, the oil suction valve 51 opens due to the difference between the internal pressure and the external pressure, and the lubricating oil O at the bottom of the housing 00 enters the oil cylinder 42 through the oil suction passage 5 a; when the oil mover 41 moves to the right, the pressure in the oil cylinder 42 increases, so that the oil suction valve 51 is closed and the oil discharge valve 52 is opened, and the lubricating oil in the oil cylinder 42 enters the gap between the piston 11 and the cylinder 21 through the oil discharge passage 5b, thereby achieving the purpose of lubricating the piston 11 and the cylinder 21. In addition, since the elastic stiffness of the resonance spring 14 is much greater than that of the oil spring 45, it has little influence on the moving state of the mover frame 13.

Claims

1. A linear compressor with an oil supply device includes a casing; lubricating oil stored in the bottom of the housing; the linear motor and the cylinder are fixed in the shell, wherein the linear motor is composed of a stator, a coil and a permanent magnet; a piston driven by a linear motor and linearly reciprocating in the cylinder; a rotor frame connecting the permanent magnet on the linear motor and the piston; a stator spring plate fixed to the stator; the resonant spring is connected between the rotor framework and the stator spring plate; the method is characterized in that: the linear compressor with the oil supply device also comprises an oil supply device; the oil supply device comprises an oil cylinder fixed on the stator spring plate; an oil mover movably disposed in the oil cylinder; an oil spring sleeved outside the oil cylinder and used for elastically supporting the oil mover; a gap is formed between the oil rotor and the rotor framework; the oil supply device also comprises a soft gasket arranged on one side of the oil mover close to the mover framework and an oil mover baffle arranged inside the shell.