KR101167736B1 - Oil pump used in a linear compressor - Google Patents

Abstract

The present invention relates to an oil supply apparatus for a linear compressor having a cushioning means, and more particularly, to a linear compressor including a main body frame, a cylinder installed in the main body frame, and a piston for linear reciprocating motion inside the cylinder. And an oil supply device of the linear compressor installed in the main body frame and circulating oil between the cylinder and the piston, the oil supply channel communicating with the oil supply path between the cylinder and the piston, and installed in the main body frame, An oil cylinder connected to an oil supply passage, a mass member performing linear reciprocating motion due to vibration of the main body frame in the oil cylinder, and installed on the oil cylinder to elastically support the mass member on both sides of the mass member. Oil pumping means having an oil elastic member, and And a buffer rod having a support rod supported on one end of the oil cylinder and inserted into the mass member, and a buffer elastic member installed inside the mass member and providing elastic force to the support rod. It is the oil supply device of the linear compressor.

Linear compressor, oil supply, shock absorber

Description

OIL PUMP USED IN A LINEAR COMPRESSOR}

1 is a cross-sectional view of an oil supply device of a linear compressor according to the prior art.

2 is a cross-sectional view of an oil supply device of a linear compressor provided with shock absorbing means according to the present invention.

3 is a cross-sectional view of an oil supply device of a linear compressor provided with shock absorbing means according to the present invention.

Figure 4 is a cross-sectional view of the mass member provided with a buffer means according to the present invention.

<Description of Tavern on Major Parts of Drawing>

52-cylinder 53-body frame

54-piston 62-oil supply

72-oil cylinder 74-mass member

76a-first oil elastic member 76b- second oil elastic member

74a-supporting rod 74b-buffered elastic member

74c-buffer path

According to the present invention, a structure consisting of a cylinder, a piston, and a linear motor is elastically supported inside the shell, and at the same time, the oil of the linear compressor is supplied between the cylinder and the piston by pumping oil stored under the shell as the piston reciprocates linearly in the cylinder. The present invention relates to a feeding device, and in particular, an oil supply device is provided with a cushioning means of the mass member to limit excessive reciprocating motion of the mass member, and to prevent wear by reducing the amount of impact transmitted to the main frame.

In general, a compressor is a mechanical device that increases pressure by receiving power from a power generator such as an electric motor or a turbine to compress air, refrigerant, or various other working gases. It is widely used throughout.

These compressors are classified into a reciprocating compressor which compresses the refrigerant while linearly reciprocating the inside of the cylinder by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder. And a rotary compressor for compressing the refrigerant while the roller is eccentrically rotated along the inner wall of the cylinder to form a compression space in which the working gas is sucked and discharged between the eccentrically rotating roller and the cylinder. As a scroll compressor that compresses the refrigerant while the rotating scroll rotates along the fixed scroll to form a compression space in which the working gas is absorbed and discharged between the orbiting scroll and the fixed scroll. Divided.

Recently, among the reciprocating compressors, in particular, the piston is directly connected to the reciprocating linear motion drive motor, so that there is no mechanical loss due to the motion conversion to improve the compression efficiency as well as a simple linear compressor has been developed a lot.

Normally, a linear compressor is configured to suck and compress refrigerant and then discharge the refrigerant while the piston is moved reciprocally linearly in the cylinder by the linear motor inside the closed shell, as the piston reciprocates linearly in the cylinder. The oil supply device is installed to pump the oil stored in the lower part of the shell to flow along the gap formed between the cylinder and the piston even if it is rubbed.

1 is a cross-sectional view of an oil supply device of a linear compressor according to the prior art. The oil supply apparatus of the linear compressor according to the prior art is a structure (1) consisting of a cylinder (2), a piston (4) and a linear motor (not shown) installed inside a closed shell (not shown) as shown in FIG. It is installed in the lower portion, the oil supply passage 12 and the oil recovery passage 14 is formed in one main body frame 3 so as to communicate with the oil circulation passage 10 formed between the cylinder (2) and the piston (4) In the oil cylinder 22 installed to communicate under the oil supply passage 12, the mass member 24 generates a pressure difference while reciprocating linearly moving in an elastically supported state by the oil springs 26a and 26b. One side of the oil cylinder 22 is installed so that the oil supply pipe 21 contained in the oil stored in the lower portion of the shell (not shown) to communicate with the oil supply between the oil supply passage 12 and the oil cylinder 22. Adjusting oil supply valve assembly (28) is installed The.

Here, the body frame (3) is fixed to the cylinder (2) and the linear motor, the piston (4) reciprocating linear motion between the top dead center (TDC) and the bottom dead center (BDC) inside the cylinder (2) While the suction stroke to suck the refrigerant into the compression space (P) formed therebetween, the compression stroke to compress and discharge is repeatedly performed. At this time, one end of the piston (4) is provided with an intake valve (6) for sucking the refrigerant and one end of the cylinder (2), the discharge valve (8a) for discharging the compressed refrigerant is fixed to one end of the cylinder (2) It is elastically supported by a spring 8c inside the discharge cap 8b and is installed to be opened and closed.

Next, the oil supply passage 12 and the oil recovery passage 14 are formed in the body frame 3 and in the cylinder 2 to form an oil circulation passage formed between the cylinder 2 and the piston 4 ( 10) so that oil can be supplied and recovered, and the oil circulation passage 10 has a ring-shaped cylinder groove 2h and a piston groove 4h at the inner circumferential surface of the cylinder 2 and the outer circumferential surface of the piston 4, respectively. It is formed to overlap each other to allow the oil to circulate.

Next, the oil cylinder 22 is installed to communicate with an end of the oil supply passage 12 below the structure 1 so that the oil cylinder 22 may be vibrated in the same manner as the structure 1, and the mass member 24 is It is installed to reciprocate linear motion inside the oil cylinder 22 by the inertial force against the vibration of the oil cylinder 22, the oil spring (26a, 26b) is elastically axially at both ends of the mass member (24) Support to generate a pressure difference in the oil cylinder (22). Of course, the lower portion of the oil cylinder 22 is installed so that the oil supply pipe 21 is in communication, the oil supply pipe 21 is installed so that the end is contained in the oil stored in the shell (not shown). Specifically, the oil cylinder 22 is fixed so that one end is fitted into the fixing groove (3h) formed stepped in the portion communicating with the oil supply passage 12 at the lower end of the main frame 3 and at the same time fixed cap on the other end (27) is forcibly fitted, and the mass member 24 is elastically supported at both ends by the oil springs 26a and 26b, respectively, in the stepped fixing groove 3h and the fixing cap 27 of the oil supply passage. It is installed as possible. At this time, the fixing cap 27 may be elastically supported by the oil spring 26a while the other end is engaged with the other end of the oil cylinder 22 and one end is forcibly fitted inside the other end of the oil cylinder 22. And a through hole 27h is formed in the center so that the pressure difference is equal to one space inside the oil cylinder 22 even when the mass member 24 reciprocates linearly in the oil cylinder 22. It is not generated and kept equal to the pressure inside the shell (not shown).

Next, the oil supply valve assembly 28 is installed at one side of the main body frame 3 through which the oil cylinder 22 and the oil supply passage 12 communicate with each other to receive an oil suction valve (not shown) and oil for sucking oil. An oil discharge valve (not shown) for discharging is installed to overlap the plate-shaped valve seat 28a formed so as to be openable and close to the outside of the valve seat 28a, and a suction storage space capable of temporarily storing oil ( A) and a seat cover 28b forming the discharge storage space B. At this time, between the valve seat 28a and the seat cover 28b are installed to further include various components such as a gasket to prevent the leakage of oil. Therefore, when the oil cylinder 22 is vibrated together with the structure 1, the oil supply device configured as described above reciprocates linearly in the oil cylinder 22 by the inertial force. Accordingly, a pressure difference is generated in one space inside the oil cylinder 22 so that oil stored under the shell (not shown) flows into the oil supply pipe 21 and passes through the oil supply valve assemblies 28a and 28b. Then, it is supplied along the oil supply passage 12 to cool and lubricate while circulating the oil circulation passage 10, and then to the lower portion of the shell (not shown) along the oil recovery passage 14 again. do.

However, the oil supply apparatus according to the prior art pumped oil by the pressure difference caused by the reciprocating motion of the mass member 24 as described above, and the second oil spring is caused by the excessive stroke of the mass member 24. Impact is applied to the main body frame (3) through the (26b) and the wear and tear occurs in the fixing groove (3h) formed stepped in the portion communicating with the oil supply passage 12 at the bottom of the aluminum main frame (3) There was a problem.

The present invention for solving the above problems is to provide an oil supply device with a cushioning means of the mass member to limit excessive reciprocating motion of the mass member, to reduce the amount of impact transmitted to the body frame to prevent wear It is done.

In addition, it is another object to improve the durability and quality of the linear compressor by preventing the wear of the body frame through the buffer means.

The present invention for achieving the above object is a linear compressor including a main body frame, a cylinder installed in the main body frame, and a piston for linear reciprocating motion inside the cylinder, is installed on the main body frame and the cylinder And an oil supply device of a linear compressor for circulating oil between the piston, comprising: an oil supply flow passage connected to supply oil between the cylinder and the piston, an oil cylinder installed on the body frame and connected to the oil supply flow passage; Oil pumping means having a mass member for linear reciprocating motion due to the vibration of the body frame in the oil cylinder, and an oil elastic member installed on the oil cylinder to elastically support the mass member on both sides of the mass member. And the mass is supported at one end of the oil cylinder A support rod and an oil supply device of the linear compressor comprises a buffer means comprising a buffer elastic member installed in the mass member is provided with an elastic force to the support rod that is inserted into the material.

In addition, the buffer means is characterized in that it comprises a buffer passage for communicating the space formed in the interior of the mass member and the outer space of the mass member due to the elastic force provided to the support rod by the buffer elastic member.

In addition, the cross-sectional area of the buffer passage is characterized in that the smaller than the cross-sectional area of the support rod.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the scope of the present invention is not limited by the embodiments described below or the accompanying drawings, which can be easily implemented by those skilled in the art to which the present invention pertains. Of course, the scope of the present invention is limited only by the claims.

2 is a cross-sectional view of an oil supply device of a linear compressor provided with a shock absorbing means according to the present invention, FIG. 3 is a cross-sectional view of an oil supply device of a linear compressor provided with a shock absorbing means according to the present invention, and FIG. It is sectional drawing of the mass member in which the buffer means was provided.

The oil supply device of the linear compressor according to the present invention has an oil pumping means 70 installed below the structure 51 composed of the cylinder 52, the piston 54 and the linear motor 55 as shown in FIG. It is configured to flow along each flow path formed inside the structure 51 by pumping oil, the main body frame 53 and the motor cover to support both ends of the structure 51 and to fix each component to each other ( 80 is installed, and the oil pumping means 70 is installed such that one end is fixed to the lower end of the main frame 53 and a part of the other end is supported on the lower end of the motor cover 80.

Here, the cylinder 52 is installed so that one end of the piston 54 reciprocates linearly therein and is sucked at one end of the piston 54 so that refrigerant can be sucked into the compression space P formed therebetween. At the same time as the hole 54h is formed, a thin suction valve 56 is installed to open and close the suction hole 54h, and one end of the cylinder 52 so that the refrigerant compressed in the compression space P can be discharged. The discharge cover 58a is elastically supported by the discharge valve spring 58c inside the discharge cap 58b fixed to one end of the cylinder 52 so as to be opened and closed. In this case, a ring-shaped cylinder groove (not shown) and a piston groove (not shown) are formed on the inner circumferential surface of the cylinder 52 and the outer circumferential surface of the piston 54, and the cylinder groove and the piston groove are engaged with each other to circulate oil. The oil circulation passage 60 is formed.

Next, the linear motor 55 includes a plurality of laminations including an inner stator 552 stacked in the circumferential direction and a plurality of windings around the coil 554a which are positioned at predetermined intervals on the outer circumferential surface of the inner stator 552. Laminated core blocks 554b are disposed between the outer stator 554 provided at regular intervals and the inner stator 552 and the outer stator 554, and the permanent magnet 556 reciprocating linearly by mutual electromagnetic force. The permanent magnet 556 is configured to be directly connected to the other end of the piston 54 by the connecting member 558 to drive the piston 54.

Next, the main body frame 53 is fixed in a state where one end of the cylinder 52 penetrates at the center thereof, and one end of the outer stator 554 is supported on one surface of the main body frame 53 in the direction of the cylinder 52. The oil supply passage 62 and the oil recovery passage 64 are formed at the inside thereof so as to supply oil to the oil circulation passage 60 or recover the supplied oil.

Next, the motor cover 80 has a hole H formed at the center thereof so that the other end of the piston 54 can pass therethrough, and the outer stator 554 on one surface of the motor cover 80 in the cylinder 52 direction. In the state where the other end of) is supported, a circumferential portion of the motor cover 80 is fixed to the main body frame 53 through the outer stator 554. In this case, a plurality of springs (not shown) for elastically supporting the piston 54 in the axial direction is elastically supported on one surface of the motor cover 80 opposite to the cylinder 52.

Next, the oil supply apparatus of the linear compressor according to the present invention includes the oil pumping means 70 and the oil supply passage 62, so that the oil pumping means 70 is in communication with the oil supply passage 62. An oil cylinder 72 having one end mounted on the main frame 53 and a stepped fixing groove 53h formed at a lower end thereof, and the other end thereof positioned to be adjacent to a lower end of the motor cover 80; and the oil cylinder 72 A mass member 74 which is installed to reciprocate linearly inward, and an oil-elastic member that elastically supports both ends of the mass member 74 in the fixing groove 53h of the main body frame and the lower end of the motor cover 80. (76a, 76b).

In more detail, as shown in FIG. 3, the oil supply device of the linear compressor according to the present invention includes the buffer means 74a, 74b, 74c. The buffer means 74a, 74b, 74c are installed on the mass member 74 to mitigate the impact caused by the linear reciprocating motion of the mass member 74, the support rod 74a and the buffer elastic member 74b ) And a buffer passage 74c. One end of the support rod 74a is installed to be inserted into the mass member 74. In addition, the other end of the support rod 74a is installed to be supported at one end of the oil cylinder 72. The cushioning elastic member 74b is installed inside the mass member 74. At this time, it is preferable that the support rod 74a is installed to provide an elastic force. Therefore, the support rod 74a is inserted after the buffer elastic member 74b is inserted into the mass member 74. The buffer passage 74c communicates a space formed inside the mass member 74 with an external space of the mass member 74 due to the elastic force provided by the buffer elastic member 74b to the support rod 74a. It is formed to. At this time, as shown in FIG. 4, the cross-sectional area A ₁ of the buffer passage 74c is a cross-sectional area A _{2 of} the support bar 74a, that is, the support bar 74a is inserted into the mass member 74. It is preferably formed to be smaller than the cross-sectional area of the axial space. The buffer means 74a, 74b, 74c having the support rod 74a, the buffer elastic member 74b, and the buffer flow path 74c as described above are provided with the insertion cross-sectional area A ₂ of the support rod 74a and the The excessive vibration of the mass member 74 is suppressed by the fluid resistance generated due to the difference in the cross-sectional area A ₁ of the buffer passage 74c. At this time, the cushioning elastic member 74b provides an elastic force to the support rod 74a after suppressing excessive vibration of the mass member 74, thereby enabling the subsequent suppression of excessive vibration.

In addition, as shown in FIG. 2, the oil supply passage 62 has an oil supply pipe 71 positioned in a space in which a lower end is immersed in the oil so that the oil can be supplied and the upper end is in communication with the oil cylinder 72. It is provided. In addition, an oil supply valve assembly 78 is installed to adjust the oil supply between the oil supply passage 62 and the oil cylinder 72, and the oil supply valve assembly 78 is the oil supply passage 62. A valve seat 78a having a plate shape in which an oil suction valve (not shown) in close contact with one side of the main body frame 53 to which oil is communicated and an oil discharge valve (not shown) for discharging oil are opened and closed; The seat cover 78b is formed to overlap each other on the outside of the valve seat 78a and forms a suction storage space A and a discharge storage space B in which oil may be temporarily stored. In this case, the oil cylinder 72 is formed in a cylindrical shape, one end of which is fitted into a fixing groove 53h formed step by step on the lower surface of the main body frame 53, and the other end is fixed on one surface of the motor cover 80. It is located close to the body frame 53 and the motor cover 80 is installed so as to be located perpendicular to the inside, the mass member 74 having the same diameter as the inner diameter of the oil cylinder 72 in the axial direction The mass member 74 is supported by the first oil elastic member 76a, which is a kind of compression coil spring, in one end of the mass member 74 in the fixing groove 53h of the main body frame. The other end of the 74 is installed at the lower end of the motor cover 80 so as to be supported by the second oil elastic member 76b, which is also a kind of compression coil spring.

Looking at the assembly process of the oil supply device of the linear compressor configured as described above, the inner stator 552 is installed to be fixed to the outer peripheral surface of the cylinder 52 and at the same time one end of the cylinder 52 and one end of the outer stator 554 It is installed to be supported by the body frame 53, the other end of the piston 54 is the inner stator 552 and the outer stator 554 with one end of the piston 54 is inserted into the cylinder 52 inside It is installed so as to be connected to the permanent magnet 556 positioned between, the first end of the oil cylinder 72 to the other end of the oil cylinder 72 in the state where the one end of the oil cylinder 72 is fitted into the fixing groove (53h) of the main body frame. The oil spring 76a, the mass member 74, and the second oil spring 76b are sequentially inserted, and then the fixing cap 77 is inserted.

The present invention has the effect of preventing the wear by limiting the excessive reciprocating motion of the mass member, by reducing the amount of impact transmitted to the main body frame by providing a buffer means of the mass member in the oil supply device.

In addition, there is another effect of improving the durability and quality of the linear compressor by preventing the wear of the body frame through the buffer means.

Claims (3)

In a linear compressor including a main body frame, a cylinder installed in the main body frame, and a piston for linear reciprocating motion inside the cylinder, oil of the linear compressor installed in the main body frame and circulating oil between the cylinder and the piston. In the supply device, An oil supply passage connected to supply oil between the cylinder and the piston; An oil cylinder installed on the main body frame and connected to the oil supply passage, a mass member performing a linear reciprocating motion due to vibration of the main body frame in the oil cylinder, and elastically supporting the mass member on both sides of the mass member. An oil pumping means having an oil elastic member installed on the oil cylinder, And a buffer rod having a support rod supported at one end of the oil cylinder and inserted into the mass member, and a cushioning elastic member installed inside the mass member and providing elastic force to the support rod. Oil supply unit of linear compressor. The method of claim 1, The buffer means includes a buffer passage for communicating the space formed inside the mass member with the outer space of the mass member due to the elastic force provided to the support rod by the buffer elastic member, the oil supply of the linear compressor Device. 3. The method of claim 2, And the cross-sectional area of the buffer passage is smaller than the cross-sectional area of the support rod.

Images