CN104251198A - Lubricating structure for linear compressor - Google Patents

Abstract

The invention discloses a lubricating structure of a linear compressor, which comprises a cylinder and a front flange. An oil supply pipeline is arranged on the front flange, and a lubricating oil is provided between the front flange and the joint surface of the cylinder. Oil is delivered from the oil supply line to the first oil passage on the surface of the piston. The lubricating structure of the linear compressor of the present invention can reduce the friction between the piston and the cylinder wall, suppress the temperature rise of the contact part between the two, and improve the performance of the linear compressor.

Description

Lubrication structure of linear compressor

technical field

The invention relates to a linear compressor, in particular to a lubricating structure of a linear compressor.

Background technique

The existing linear compressor includes a shell, and lubricating oil is stored at the bottom of the inner cavity of the shell. The shell is equipped with a cylindrical outer stator, the inner cavity of the outer stator is provided with a cylindrical inner stator, the outer stator and the inner stator are coaxial, and a cylindrical mover is inserted between the outer stator and the inner stator. The inner stator has a built-in coil, and a coaxial piston is set in the inner cavity of the inner stator. One end of the piston is movably inserted on the mover, and the other end is movably inserted in the inner cavity of the cylinder, and an exhaust valve is installed in the cylinder. Piston, cylinder and exhaust valve together form a compression chamber with built-in refrigerant gas. When the coil is energized, the inner stator and the outer stator form a magnetic field with varying magnetic field strength. Under the action of the magnetic field force, the mover reciprocates in the axial direction, and the mover drives the piston to reciprocate along the inner cavity of the cylinder, thereby compressing the refrigerant gas filled in the compression chamber. After the refrigerant gas is compressed, a large amount of heat is released. At the same time, the friction between the outer surface of the piston and the inner wall of the cylinder will increase the temperature of the contact part between the piston and the cylinder, and the heat will increase the temperature of the cylinder, which will easily lead to a decrease in the performance of the linear compressor.

Contents of the invention

The purpose of the present invention is to provide a lubricating structure for a linear compressor, which can reduce the friction between the piston and the cylinder wall, suppress the temperature rise of the contact part between the two, and improve the performance of the linear compressor.

In order to achieve the above object, the present invention provides a lubricating structure for a linear compressor, which includes a cylinder and a front flange, and an oil supply pipeline is arranged on the front flange, wherein the joint surface between the front flange and the cylinder There is a first oil passage for delivering lubricating oil from the oil supply pipeline to the surface of the piston.

The first oil passage includes a passage formed by the cooperation of the horizontal groove provided on the front flange wall and the cylinder wall, or a passage formed by the cooperation of the horizontal groove provided on the cylinder wall and the front flange wall The passage, or the passage formed by the cooperation of the horizontal groove arranged on the front flange wall and the groove arranged on the cylinder wall.

A step portion is formed on one side of the inner wall of the front flange, and one side of the cylinder is embedded in the step portion, and the first oil passage includes the contact between the cylinder and/or the step portion A vertical groove is formed, and the vertical groove communicates with the horizontal groove.

It also includes an oil return line connecting the first oil line and the oil supply mechanism.

After adopting the above scheme, the lubricating structure of the linear compressor of the present invention can make the lubricating oil transported from the oil supply pipeline to the first oil passage on the surface of the piston by setting the first oil path between the front flange and the cylinder joint surface. This design can make the lubricating oil It enters between the cylinder and the piston to keep them lubricated, avoiding the occurrence of dry friction when the piston is running, thereby inhibiting the temperature rise of the contact part between the piston and the cylinder, achieving the lubrication effect of the piston and the cylinder, and improving the performance of the linear compressor improve.

A further beneficial effect of the present invention is: the first oil passage is designed to include a passage formed by the cooperation between the horizontal groove arranged on the front flange wall and the cylinder wall, or the horizontal groove arranged on the cylinder wall The passage formed by cooperating with the front flange wall, or the passage formed by the cooperation of the horizontal groove provided on the front flange wall and the horizontal groove provided on the cylinder wall, the first oil passage designed in this way is While ensuring that it can enter the surface of the piston, the first oil passage is easy to process, has a simple process, saves costs, and has a simple and compact structure.

The further beneficial effect of the present invention is: by designing the oil return line connected with the first oil line and the oil supply mechanism, it can ensure that the lubricating oil can circulate and flow between the cylinder and the piston, so that the cylinder and the piston are always lubricated.

Description of drawings

Fig. 1 is a structural schematic diagram of the first embodiment of the lubricating structure of the linear compressor of the present invention;

Fig. 2 is the A-A direction sectional schematic diagram of Fig. 1;

Fig. 3 is a structural schematic diagram of the second embodiment of the lubrication structure of the linear compressor of the present invention;

Fig. 4 is a structural schematic diagram of the third embodiment of the lubricating structure of the linear compressor of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

As shown in Fig. 1 and Fig. 2, it is a structural schematic diagram of the first embodiment of the lubricating structure of the linear compressor of the present invention, including a casing 1, and lubricating oil is stored at the bottom of the inner cavity of the casing 1. The shell 1 is equipped with a cylindrical outer stator 14, the inner cavity of the outer stator 14 is provided with a cylindrical inner stator 15, the outer stator 14 and the inner stator 15 are coaxial, and a circle is inserted between the outer stator 14 and the inner stator 15. Cylindrical mover 16. The inner stator 15 has a built-in coil 17, and a coaxial piston 10 is arranged in the inner cavity of the inner stator 15. The left end of the piston 10 is movably inserted on the inner wall of the mover 16, and the right end is inserted into the cylinder located in the casing 1. 3 in the lumen. An exhaust valve plate 18 is arranged in the cylinder 3, and the piston 10, the cylinder 3 and the exhaust valve plate 18 together form a compression chamber with a built-in refrigerant gas. The lubricating oil in the shell 1 communicates with the oil supply mechanism 2, and the oil supply mechanism 2 is placed in the lubricating oil in the shell 1. A front flange 4 is installed on the outer surface of the cylinder 3, and both the cylinder 3 and the front flange 4 are cylindrical.

An oil supply line 7 and a third oil line 8 extend radially on the front flange 4 . The oil supply pipeline 7 and the third oil passage 8 are arranged symmetrically around the circumference of the front flange 4 . The oil supply line 7 is located below the third oil line 8 . The right end of the inner wall surface of the front flange 4 forms a stepped portion 6 , and the left end of the cylinder 3 is embedded on the stepped portion 6 . An L-shaped first groove 12 composed of a horizontal groove and a vertical groove is formed on the cylinder 3 in contact with the stepped portion 6, and the contact surface of the first groove 12 and the stepped portion 6 forms a first oil passage . The first oil passage can make lubricating oil flow on the outer surface of the piston 10 , and the first oil passage communicates with the oil supply pipeline 7 and the third oil passage 8 . The third oil passage 8 is used to discharge the lubricating oil flowing through the first oil passage into the lubricating oil in the housing 1 . The first oil passage is located on the upper part of the piston 10 .

A ring-shaped second groove 13 is also formed on the cylinder 3 in contact with the stepped portion 6 along the circumferential direction, and the second groove 13 communicates with the oil supply mechanism 2 through the oil pipe 9 with a predetermined hardness. The contact surface of the second groove 13 and the step portion 6 forms a second oil passage. The second oil passage can circulate lubricating oil, and it is in communication with the first oil passage, the oil supply pipeline 7 and the third oil passage 8 . The second oil passage, the third oil passage 8 and the oil pipe 9 form an oil return pipeline.

As shown in Figure 3, it is a schematic structural diagram of the second embodiment of the lubrication structure of the linear compressor of the present invention. Most of its structure is the same as that of the first embodiment above, and the difference is that the step part 6 is in contact with the cylinder 3 An L-shaped first groove 12' is formed at the position, and the contact surface of the first groove 12' and the cylinder 3 forms a first oil passage. A ring-shaped second groove 13' is also formed on the part of the step part 6 that is in contact with the cylinder 3 along the circumferential direction, and the surface of the second groove 13' that contacts the cylinder 3 forms a second oil passage.

As shown in Figure 4, it is a schematic structural diagram of the third embodiment of the lubrication structure of the linear compressor of the present invention. Most of its structure is the same as that of the first embodiment above, and the difference is that the step part 6 is in contact with the cylinder 3 L-shaped first grooves 12" are formed respectively, and two L-shaped first grooves 12" form a first oil passage. Ring-shaped second grooves 13 ″ are respectively formed in the contact positions of the stepped portion 6 and the cylinder 3 along the circumferential direction, and the two second grooves 13 ″ form a second oil passage.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be determined by the claims.

Claims (4)

1. a lubricating structure for linear compressor, comprises cylinder and forward flange, described forward flange is provided with oil feed line, it is characterized in that: be provided with between described forward flange and cylinder junction plane and lubricant oil can be made to be delivered to the first oil circuit of piston face from oil feed line.

2. the lubricating structure of linear compressor according to claim 1, it is characterized in that: described first oil circuit comprises the path complemented each other to form to groove and cylinder wall by the level be arranged on forward flange wall, or comprise the path complemented each other to form to groove and forward flange wall by the level be arranged on cylinder wall, or comprise by the level be arranged on forward flange wall to groove be arranged at the path that the groove fit on cylinder wall formed.

3. the lubricating structure of linear compressor according to claim 2, it is characterized in that: the internal face side of described forward flange is formed with stepped part, described cylinder side embeds this stepped part, described first oil circuit comprise by described cylinder and/or described stepped part in both touching positions formed vertical to groove, to be describedly vertically communicated with to groove to groove with described level.

4. according to the lubricating structure of the linear compressor one of claim 1-3 Suo Shu, it is characterized in that: the return line also comprising connection first oil circuit and oil feeding mechanism.