KR20180100882A - Reciprocating compressor - Google Patents

Abstract

The present invention relates to a reciprocating compressor capable of smoothly supplying oil to a cylinder. The reciprocating compressor comprises: a shell having a sealed space for storing oil therein; a driving part disposed in the shell and having a rotary shaft, a rotor connected with the rotary shaft, and a stator arranged on the outer face of the rotor; a frame having a cylinder forming a compression space in which refrigerant is compressed; a piston reciprocating in the compression space of the cylinder; a connecting rod converting rotary power of the rotary shaft into a reciprocating action of the piston; a first oil supply tool connected to the rotary shaft to supply oil stored in the shell to the inside of the rotary shaft; an oil receiving part formed at one side of the frame to collect oil discharged and scattered to an upper portion of the rotary shaft; and a second oil supply tool for pumping oil stored in the oil receiving part to supply the oil to the inside of the cylinder.

Description

[0001] Reciprocating compressor [0002]

The present invention relates to a reciprocating compressor.

The reciprocating compressor is a compressor in which the piston sucks and compresses the refrigerant while reciprocating linearly in the cylinder.

In Korean Patent Laid-Open Publication No. 10-2010-0083652 (published on July 22, 2010), which is a prior art document, a reciprocating compressor is disclosed.

The reciprocating compressor of the prior art includes a case having a closed space formed therein, a driving part provided in the case to generate a rotating force, and a connecting rod coupled to the rotating shaft of the driving motor, And a compression mechanism for converting the refrigerant into a linear reciprocating motion of the piston to be positioned.

The reciprocating compressor requires oil supply for lubrication of the compression mechanism section and the drive section.

Oil for lubrication and cooling of the electromotive portion and the compression mechanism is stored in a bottom portion of the case, and an oil passage is formed in the rotation shaft.

An oil supply mechanism for pumping up the oil stored in the bottom of the case to the oil passage in the rotary shaft is provided at the lower end of the rotary shaft.

The oil supply mechanism is formed in a screw shape so that the oil is transported upward along the outer circumferential surface of the oil supply mechanism during the rotation of the rotation shaft and is scattered by the centrifugal force during rotation of the rotation shaft to be supplied into the piston and the cylinder.

However, according to the prior art, the oil can smoothly flow along the outer circumferential surface of the oil supply mechanism during high-speed operation, but the oil can not smoothly flow along the outer circumferential surface of the oil supply mechanism at low- .

In this case, there is a problem in that the lubrication at the friction portion such as the piston and the rotary shaft is not smooth, resulting in abrasion of the friction portion.

An object of the present invention is to provide a reciprocating compressor capable of maintaining the amount of oil pumped even at a low speed operation and lubrication at a friction portion.

Another object of the present invention is to provide a reciprocating compressor having an additional oil supply mechanism that is operated in accordance with a reciprocating motion of a piston at a low speed operation.

It is still another object of the present invention to provide a reciprocating compressor in which the oil sucked through the additional oil supply mechanism can be smoothly supplied to the cylinder side.

Another object of the present invention is that the oil sucked through the additional oil supply mechanism can be stably supplied to the cylinder side without flowing backward.

The reciprocating compressor according to an embodiment of the present invention includes an oil accommodating portion disposed at one side of a frame provided with a cylinder and being discharged to an upper portion of a rotary shaft to collect scattered oil, And a second oil supply mechanism for supplying the oil to the inside of the cylinder. Therefore, the oil can be stably supplied to the friction portion of the piston which needs to be lubricated not only at high speed operation but also at low speed operation.

According to the present invention, the second oil supply mechanism includes an oil feeder for pumping the oil stored in the oil containing portion, and a connecting pipe connecting the oil feeder and the cylinder, Oil can be smoothly supplied to the cylinder side.

According to the present invention, the oil feeder and the oil receiving portion are disposed on one side of the frame corresponding to the upper side of the rotor and the stator, so that the piston movement of the oil feeder is prevented by the vibration generated by the reciprocating motion of the piston at low- It can be done smoothly.

According to the present invention, at least a part of the oil feeder is located inside the oil accommodating portion, and the oil feeder includes a suction portion for sucking the oil stored in the oil accommodating portion, The stored oil can be pumped smoothly.

According to the present invention, the oil feeder includes an oil cylinder, an oil piston formed in a hollow shape and reciprocating within the oil cylinder, a valve provided inside the oil cylinder to regulate the flow of oil, And an oil spring for supporting both ends of the oil piston. Therefore, the oil sucked through the oil feeder can be stably provided to the cylinder side without flowing backward.

According to the present invention, since an additional oil supply mechanism for supplying oil into the cylinder during low-speed operation is provided, the oil can be stably supplied into the cylinder not only during high-speed operation but also during low-speed operation. Therefore, there is an advantage that the oil can be stably supplied to the friction portion of the piston requiring lubrication.

According to the present invention, since the additional oil supply mechanism is operated by the vibration generated in accordance with the reciprocating movement of the piston at low speed operation, there is an advantage that a separate power source for operating the additional oil supply mechanism is not required.

According to the present invention, since the oil supply amount in the cylinder is maintained even in the low-speed operation, there is an advantage that the low-speed operation range of the compressor can be expanded.

According to the present invention, since the oil sucked through the additional oil supply mechanism is stably supplied to the cylinder side through the pipe, the oil supply can be reliably performed.

According to the present invention, the oil sucked through the additional oil supply mechanism can be stably supplied to the cylinder side without flowing backward.

1 is a longitudinal sectional view of a reciprocating compressor according to an embodiment of the present invention;
2 is a perspective view showing a state in which a second oil supply mechanism according to the embodiment of the present invention is installed in a frame;
3 is a view showing a process in which oil pumped by the second oil supply mechanism is supplied to the inside of the cylinder.
4 is a perspective view of the oil feeder of the second oil supply mechanism.
5 is a cross-sectional perspective view of the oil feeder.
6 and 7 are longitudinal sectional views showing the operation of the oil piston of the oil feeder.
8 is a view showing a process in which oil pumped by a second oil supply mechanism according to another embodiment of the present invention is supplied to the inside of the cylinder.

The present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the embodiments described herein are illustrated by way of example for purposes of clarity of understanding and that the present invention may be embodied with various modifications and alterations. Also, for ease of understanding of the invention, the appended drawings are not drawn to scale, but the dimensions of some of the components may be exaggerated.

Hereinafter, a reciprocating compressor according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a longitudinal sectional view of a reciprocating compressor according to an embodiment of the present invention.

1, a reciprocating compressor 1 according to an embodiment of the present invention includes a shell 10 forming a closed internal space, a driving unit 20 installed inside the shell 10, And a compression mechanism unit 30 that receives the driving force of the driving unit 20 and compresses the refrigerant.

The driving unit 20 includes a stator 21, a rotor 22 rotatably installed inside the stator 21, and a rotor 22 coupled to the center of the rotor 22, And a rotation shaft 24 for transmitting the rotation of the rotating shaft 30 to the rotating shaft 24.

The rotation shaft 24 may have a fin 25 formed thereon. The fin 25 is eccentrically formed so as to have a constant amount of eccentricity from the center of the rotation shaft 24.

The compression mechanism 30 includes a frame 31 having a cylinder 32, a piston 34 reciprocating linearly in a compression space V1 in the cylinder 32, To the piston (34).

The frame 31 may be elastically supported by a support spring 50 supported by the shell 10.

The connecting rod 33 converts the rotational motion of the rotational shaft 24 into a linear motion of the piston 34.

The connecting rod 33 includes a piston connecting portion 332 rotatably connected to the piston 34, a rod portion 334 extending from the piston connecting portion 332, And a shaft connecting portion 336 formed on the fin portion 25 and coupled to the pin portion 25.

The piston connecting portion 332 may be rotatably connected to the piston 34 by a pin 338 passing through the piston 34 and the piston connecting portion 332 up and down.

The pin 25 of the rotating shaft 24 can be inserted into the shaft connecting portion 336 and rotated about the shaft connecting portion 336.

The frame 31 may include a bearing portion 310 through which the rotation shaft 24 passes. At least a portion of the bearing portion 310 may be inserted into the rotor 22.

The rotating shaft 24 has a small diameter portion 241 in which the diameter of the rotating shaft 24 is reduced in the longitudinal direction of the rotating shaft 24. This is to reduce the friction area between the rotary shaft 24 and the bearing part 310 in the longitudinal direction of the rotary shaft 24.

For example, a small diameter portion 241 is formed at an intermediate portion of the rotation shaft 24. A portion of the bearing portion 310 corresponding to the small diameter portion 241 of the rotation shaft 24 does not serve as a bearing. The bearing portion 310 includes an upper bearing portion 312 and a lower bearing portion 314 as a portion excluding a portion corresponding to the small diameter portion 241 of the rotary shaft 24.

Therefore, the rotating shaft 24 can be substantially in contact with the upper bearing portion 312 and the lower bearing portion 314 of the bearing portion 310.

The compression mechanism 30 includes a valve assembly 36 arranged to cover the compression space V1 of the cylinder 32, a suction muffler 38 provided on the suction side of the valve assembly 36, And a discharge cover (37) covering the discharge side of the valve assembly (36).

Although not shown, the valve assembly 36 may be provided with a suction valve and a discharge valve.

The suction muffler 38 serves to reduce noise during the suction of the refrigerant. The refrigerant flowing through the suction muffler 38 may be introduced into the compression space V1 by opening the suction valve. The suction muffler 38 can communicate with a suction pipe (not shown).

The refrigerant introduced into the compression space V1 is compressed by the piston 34 and then discharged to the discharge space V2 formed in the discharge cover 37 by opening the discharge valve.

The refrigerant discharged into the discharge space V2 is discharged to the outside of the shell 10 through the discharge pipe 39 after passing through the discharge muffler (not shown).

In order to compress the refrigerant in the compression space V1, the rotary shaft 24 is rotated in the bearing portion 310 of the frame 31, and the fin portion 25 is rotated relative to the shaft connecting portion 336 .

In order to compress the refrigerant in the compression space (V1), the piston (34) moves linearly in the cylinder (32).

Therefore, oil for lubrication must be supplied to the friction region between the relative moving parts so that friction between the relative moving parts is prevented.

For this purpose, the oil may be stored in the shell 10 at a certain level.

A first oil supply mechanism 40 may be connected to the rotary shaft 24 to supply the oil stored in the shell 10 to a friction portion.

In addition, a plurality of oil passages 242, 244, and 246 for allowing oil to flow may be formed on the rotary shaft 24. [

The plurality of oil passages 242, 244 and 246 may include a first oil passage 242 for allowing oil to flow in the axial direction within the rotary shaft 24.

The oil can be discharged to the upper portion of the rotary shaft 24 after being lifted up along the rotary shaft 24 by the first oil passage 242 and scattered.

The oil that has been discharged to the upper portion of the rotary shaft 24 and is scattered can be supplied into the cylinder 32.

The plurality of oil passages 242, 244 and 246 may include a second oil passage 244 extending spirally along the outer circumferential surface of the rotary shaft 24. The second oil passage 244 may communicate with the first oil passage 242.

Although not shown, a first oil hole may be formed in the rotary shaft 24 to communicate the first oil passage 242 and the second oil passage 244 with each other.

The second oil passage 244 is an oil groove recessed from the outer circumferential surface of the rotary shaft 24.

The oil introduced into the second oil passage 244 lubricates the outer circumferential surface of the rotating shaft 24 and the inner circumferential surface of the bearing portion 310.

The plurality of oil passages 242, 244 and 246 may include a third oil passage 246 communicating with the second oil passage 244 and extending along the fin 25.

A second oil hole 247 may be formed in the rotary shaft 24 to communicate the second oil passage 244 and the third oil passage 246 with each other.

The oil flowing along the third oil passage (246) may be discharged into the shaft connecting portion (336) and scattered. Therefore, lubrication between the shaft connecting portion 336 and the fin portion 25 becomes possible.

A part of the oil discharged into the shaft connecting portion 336 and scattered may be supplied into the cylinder 32 along the connecting rod 33.

The first oil supply mechanism 40 draws the oil stored in the shell 10 into the first oil passage 242 of the rotary shaft 24 during the rotation of the rotary shaft 24.

On the other hand, when the compressor 1 is operated at high speed, the oil can smoothly flow along the outer circumferential surface of the first oil supply mechanism 40, but at the time of low speed operation, The amount of oil pumping can be reduced.

In this case, between the piston 34, which reciprocates linearly in the compression space V1 in the cylinder 32, and the piston connecting portion 332, which is rotatably connected to the piston 34, May not be lubricated.

Therefore, in the present invention, the second oil supply mechanism 100 is provided to smoothly supply the oil into the cylinder 32 even during the low-speed operation.

FIG. 2 is a perspective view showing a state in which a second oil supply mechanism according to an embodiment of the present invention is installed in a frame, FIG. 3 is a view showing a process in which oil pumped by the second oil supply mechanism is supplied into a cylinder to be.

2 and 3, the piston 34 for compressing the refrigerant is linearly reciprocated with respect to the cylinder 32. As shown in Fig. In the present invention, the reciprocating motion direction of the piston 34 will be referred to as "lateral direction ".

When the compressor is operated, the piston 34 reciprocates linearly with respect to the cylinder 32, and the vibration in the lateral direction may occur at this time. The magnitude of such vibration is inversely proportional to the operating frequency of the compressor due to the characteristics of the compressor.

That is, at the time of high-speed operation, the amount of vibration in the transverse direction decreases, and in the case of low-speed operation, the amount of vibration in the transverse direction increases.

Accordingly, the present invention provides a second oil supply mechanism (100) for supplying oil to the cylinder (32) side by linearly reciprocating the oil piston by the vibration in the lateral direction during low speed operation.

Further, the vibration generated by the reciprocating movement of the piston 34 may occur at a position higher than the lower point of the compression mechanism unit 30. [ Therefore, it is preferable that the second oil supply mechanism 100 is installed at a position as high as possible in the compression mechanism unit 30.

The second oil supply mechanism 100 is disposed at one side of the frame 31 corresponding to the upper side of the rotor 22 and the stator 21 in the present invention.

According to another embodiment of the present invention, however, the second oil supply mechanism 100 is disposed on the lower side of the compression mechanism unit 30, and the oil stored in the shell 10 is pumped, It is also possible to supply oil to the inside of the cylinder 32.

That is, the second oil supply mechanism 100 of the present invention can be installed at various positions inside the shell 10.

The second oil supply mechanism 100 includes an oil feeder 50 for pumping oil stored in the oil receiver 60 and a connection pipe for connecting the oil feeder 50 and the cylinder 32 70).

The oil receiving portion 60 may be disposed on one side of the frame 31. The oil receiving portion 60 may have a partially recessed shape to form a space 61 in which oil is stored. That is, the oil receiving portion 60 may be formed in a substantially container shape. The oil discharged from the upper portion of the rotating shaft 24 and scattered can be collected in the space 61 of the oil receiving portion 60.

Alternatively, the oil receiving portion 60 may be formed as a part of the frame 31 is recessed. That is, the oil receiving portion 60 may be formed integrally with the frame 31 and may contain oil that is discharged from the upper portion of the rotating shaft 24 and scattered.

The oil feeder 50 is disposed adjacent to the oil receiving portion 60 to pump the oil stored in the oil receiving portion 60. At this time, at least a portion of the oil feeder 50 may be located inside the oil receiving portion 60.

The oil feeder 50 may be fixed to one side of the oil receiving portion 60 or may be fixed to one side of the frame 31.

Further, the oil feeder 50 pumps the oil stored in the oil receiving portion 60 and supplies the oil to the cylinder 32 side.

To this end, an oil passage for oil to flow is formed in the oil feeder (50). The inlet side (or suction side) of the oil passage communicates with the space 61 of the oil accommodating portion 60 and the discharge side (or the discharge side) of the oil passage is communicated with the inside of the cylinder 32 have.

The oil feeder 50 may include a suction portion 50a for effectively sucking the oil stored in the oil receiving portion 60. The inlet portion of the oil passage may be formed in the suction portion 50a.

For example, the suction portion 50a may extend downward from the lower portion of the oil feeder 50, and at least a portion of the suction portion 50a may be locked by the oil stored in the oil receiving portion 60 .

Therefore, the oil stored in the oil receiving portion 60 can easily flow into the oil feeder 50 by the structure of the suction portion 50a.

The connecting pipe 70 connects the discharge side of the oil feeder 50 and the inside of the cylinder 32. At this time, a discharge hole 50b for discharging oil is formed at one side of the oil feeder 50, and an oil hole 321 for supplying oil to the cylinder 32 may be formed.

That is, the connection pipe 70 can connect the discharge hole 50b of the oil feeder 50 and the oil hole 321 of the cylinder 32. [ At this time, the oil hole 321 is formed on the upper surface of the cylinder 32 and can communicate with the compression space V1.

Therefore, the oil flowing along the oil path of the oil feeder 50 can be supplied to the inside of the cylinder 32 through the connecting pipe 70.

Hereinafter, the oil feeder will be described in detail with reference to the drawings.

Fig. 4 is a perspective view of the oil feeder, and Fig. 5 is an exploded cross-sectional perspective view of the oil feeder.

4 and 5, the oil feeder 50 includes an oil cylinder, an oil piston 54 inserted into the oil cylinder, and a first oil passage 54 for elastically supporting both ends of the oil piston 54, And second oil springs 55a and 55b.

The oil cylinder forms an internal space through which the oil flows. The oil cylinder may be formed to have a substantially cylindrical shape. A suction hole 50a through which oil stored in the oil receiver 60 is formed is formed at one side of the oil cylinder and a discharge hole 50b through which oil is discharged to the outside is formed at the other side of the oil cylinder .

The suction portion 50a may protrude downward from one side bottom of the oil cylinder and extend toward the oil receiving portion 60 side. The suction portion 50a is spaced from the bottom surface of the oil receiving portion 60 by a predetermined distance so that the oil stored in the oil receiving portion 60 can be sucked smoothly through the suction portion 50a.

The discharge hole 50b may be formed on the other side of the cylinder. A connection pipe 70 connecting the discharge hole 50b and the oil hole 321 of the cylinder 32 may be inserted into the discharge hole 50b.

The oil cylinder includes a first case 51 in which the suction portion 50a is formed, a second case 52 in which the discharge hole 50b is formed, and a second case 52 in which the first case 51 and the second And a case connecting portion 53 connecting the case 52. [

That is, since the oil cylinder can be separated into a plurality of cases, it is easy to replace and repair components inside the oil cylinder.

The oil piston 54 linearly reciprocates inside the oil cylinder, thereby dividing the inside of the oil cylinder into the suction space S1 and the discharge space S2. The oil piston 54 can reciprocate in the transverse direction due to the lateral vibration caused by the linear movement of the piston 34 when the compressor is driven.

For example, the oil piston 54 may be designed to operate in response to a vibration frequency that occurs when the compressor is operating at a low speed (for example, when operating at an operating frequency of less than 20 Hz).

The oil piston 54 may have a hollow 54a shape in which the interior of the oil piston 54 is hollow. Accordingly, the oil sucked into the suction space S1 can be moved toward the discharge space S2 through the hollow 54a by a pressure difference.

The oil feeder 50 includes an oil suction valve 56a provided on the discharge side of the oil piston 54 and an oil discharge valve 56b provided on the discharge side of the oil cylinder and the oil discharge valve 56b And may further include a shield member 57 for opening and closing.

At this time, the second oil spring 55b may be interposed between the oil suction valve 56a and the shielding member 57. [

The oil suction valve 56a and the oil discharge valve 56b can operate as a check valve that opens and closes the fluid to flow only to one side. That is, the oil suction valve 56a can be kept in a state of being shielded by the tip end of the piston 54, and the oil discharge valve 56b can be kept in a state of being shielded by the shielding member 57 .

In detail, the oil suction valve 56a may be interposed between the discharge side end of the piston 54 and the second oil spring 55b. When the piston 54 moves to the left with reference to FIG. 7, the pressure in the suction space S1 is increased, and the oil in the suction space S1 presses the oil suction valve 56a. Then, the pressurized oil suction valve 56a is opened and the oil flowing in the suction space S1 can be moved to the discharge space S2 by the pressure difference.

In addition, the oil discharge valve 56b may be interposed between the second oil spring 55b and the outlet end of the oil cylinder. When the piston 54 moves to the right with reference to FIG. 6, the oil in the discharge space S2 pressurizes the oil discharge valve 56 as the pressure in the discharge space S2 increases. Then, the pressurized oil discharge valve 56b is opened and oil flowing in the discharge space S2 can be discharged to the outside of the oil cylinder.

Hereinafter, a method of operating the oil feeder of the present invention will be described in detail with reference to the drawings.

6 and 7 are longitudinal sectional views showing the operation of the oil piston of the oil feeder.

When power is applied to the compressor, the rotor 22 rotates due to the interaction between the stator 21 and the rotor 22, and the rotary shaft 24 coupled to the rotor 22 rotates together do.

The rotary motion of the rotary shaft 24 is converted into reciprocating linear motion by the connecting rod 33 and the piston 34 linearly reciprocates in the compression space V1 inside the cylinder 32. [ Then, the reciprocating linear motion of the piston 34 causes the vibration in the transverse direction, and the oil cylinder of the oil feeder 50 can vibrate in the lateral direction by the vibration.

At this time, when the compressor is operated at a low speed, the amount of vibration in the lateral direction increases, and the piston 54 of the oil feeder 50 reciprocates in the lateral direction in accordance with the vibration frequency generated at the time of low- .

6, when the oil cylinder moves in the "P" direction in the figure, the piston 54 pushes the second oil spring 55b and moves in the direction opposite to the oil cylinder (FIG. 6 Right direction as a reference). Then, the oil filled in the discharge space S2 presses the oil discharge valve 56b to open the oil discharge valve 56b, and the oil is discharged to the outside of the oil cylinder.

At this time, the oil in the oil receiving portion 60 flows into the oil cylinder through the suction portion 50a. Therefore, the suction space S1 is filled with fresh oil.

7, when the oil cylinder moves in the "Q" direction in the drawing, the piston 54 pushes the first oil spring 55a and moves in the direction opposite to the oil cylinder 7 in the left direction).

At this time, since the discharge space S2 is in a state in which the oil is already discharged, the discharge space S2 becomes relatively low in pressure as compared with the suction space S1. Then, the oil in the suction space S1 having a relatively high pressure moves to the discharge space S2 having a relatively low pressure.

Therefore, as described above, the piston 54 can continuously repeat the reciprocating motion in which the right and left sides alternately move. The oil sucked in the oil receiving portion 60 may be introduced into the cylinder 32 through the connecting pipe 70 via the oil feeder 50. [

8 is a view showing a process in which oil pumped by the second oil supply mechanism according to another embodiment of the present invention is supplied to the inside of the cylinder.

The present embodiment is the same as that of Fig. 3 in other parts, except that there is a difference in the position of the oil holes of the cylinder. Therefore, only characteristic portions of the present embodiment will be described below, and the same portions as those of FIG. 3 will be referred to.

Referring to FIG. 8, an oil hole 321 for supplying oil is formed on a side surface of the cylinder 32 according to another embodiment of the present invention. The oil hole 321 extends to the compression space V1 of the cylinder 32 and can communicate with the compression space V1.

One end of the connecting pipe 70 may be connected to the discharge hole 50b of the oil feeder 50 and the other end may be connected to the oil hole 321.

Therefore, the oil stored in the oil receiving portion 60 is sucked through the oil feeder 50, and the sucked oil can be supplied to the inside of the cylinder 32 through the connecting pipe 70. At this time, since the connecting pipe 70 is connected to the side surface of the cylinder 32, not the upper surface of the cylinder 32, the length of the oil path for supplying the oil can be shortened.

The oil can be quickly supplied to the compression space V1 of the cylinder 32 from the oil feeder 50 and the vibration of the connection pipe 70 during the operation of the compressor There is an effect that the noise can be minimized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents. .

Claims (12)

A shell forming an enclosed space and storing oil therein;
A driving unit provided in the shell and including a rotating shaft, a rotor connected to the rotating shaft, and a stator disposed outside the rotor;
A frame provided with a cylinder forming a compression space in which refrigerant is compressed;
A piston reciprocating in a compression space of the cylinder;
A connecting rod for converting a rotational force of the rotating shaft into a reciprocating motion of the piston;
A first oil supply mechanism connected to the rotary shaft to supply the oil stored in the shell to the rotary shaft;
An oil receiving part formed at one side of the frame and discharging the oil scattered by the upper part of the rotating shaft to collect oil; And
And a second oil supply mechanism for pumping the oil stored in the oil storage portion and supplying the oil to the inside of the cylinder. The method according to claim 1,
Wherein the second oil supply mechanism comprises:
An oil feeder for pumping the oil stored in the oil receiving portion,
And a connecting pipe connecting the oil feeder and the cylinder. 3. The method of claim 2,
Wherein the oil feeder and the oil receiving portion are disposed on one side of the frame corresponding to the upper side of the rotor and the stator. 3. The method of claim 2,
Wherein the oil receiving portion is formed as a portion of the frame is recessed. 3. The method of claim 2,
And at least a part of the oil feeder is located inside the oil accommodating portion. 6. The method of claim 5,
Wherein the oil feeder includes a suction portion protruding downward from a lower portion of the oil feeder to suck the oil stored in the oil containing portion. 3. The method of claim 2,
An oil hole for supplying oil from the oil feeder is formed on the outer surface of the cylinder,
The connecting pipe connects the oil hole of the cylinder and the discharge side of the oil feeder. 8. The method of claim 7,
And the oil hole communicates with the compression space of the cylinder. 8. The method of claim 7,
Wherein the oil hole is formed on an upper surface or a side surface of the cylinder. 3. The method of claim 2,
The oil feeder includes:
Oil cylinder;
An oil piston formed in a hollow shape and reciprocating within the oil cylinder;
A valve provided inside the oil cylinder to regulate the flow of oil; And
And an oil spring for supporting both ends of the oil piston. 11. The method of claim 10,
Wherein the valve comprises:
An oil suction valve disposed at an end of the oil piston; And
And an oil discharge valve disposed on the discharge side of the oil cylinder. A shell forming an enclosed space and storing oil therein;
A driving unit provided in the shell and including a rotating shaft, a rotor connected to the rotating shaft, and a stator disposed outside the rotor;
A frame provided with a cylinder forming a compression space in which refrigerant is compressed;
A piston reciprocating in a compression space of the cylinder;
A connecting rod for converting a rotational force of the rotating shaft into a reciprocating motion of the piston;
A first oil supply mechanism connected to the rotary shaft to supply the oil stored in the shell to the rotary shaft; And
And a second oil supply mechanism for pumping the oil stored in the shell and supplying the oil to the inside of the cylinder.

Images