KR20210028960A - Lubricant oil provider and reciprocation compressor using the same - Google Patents

Abstract

Disclosed are a lubricating oil supply device and a reciprocating compressor including the same. According to an embodiment of the present invention, a lubricating oil supply device comprises a rotating part including a rotating body and an inner gear, an outer gear, an upper cover, and a lower cover. The upper cover includes an upper plate and a first sidewall, and the first sidewall faces and surrounds an outer circumferential surface of the outer gear. According to an embodiment of the present invention, it is possible to provide a lubricating oil supply device having reduced oil supply variation, easy assembly, and excellent operation, and a reciprocating compressor including the same.

Description

Lubricating oil supply device and reciprocating compressor including the same {LUBRICANT OIL PROVIDER AND RECIPROCATION COMPRESSOR USING THE SAME}

The present invention relates to a lubricating oil supply device and a reciprocating compressor including the same, and more particularly, in a reciprocating compressor that compresses fluid while a piston reciprocates in connection with the rotation of a rotation shaft to supply lubricant by being coupled to a rotation shaft. It relates to a lubricating oil supply device and a reciprocating compressor including the same.

A compressor is a mechanical device that increases pressure by compressing air, refrigerant or gas. Compressors include a scroll compressor that compresses gas by rotating two scrolls relative to each other, and a reciprocating compressor that compresses gas while a piston reciprocates.

As related to a reciprocating compressor, Korean Patent Publication No. 2019-0036992 discloses a compressor, and the compressor includes a housing (shell), a rotating shaft, a cylinder, a piston, a connecting rod, a crank pin, an elastic body, and a lubricant supply unit. .

The lubricant supply unit disclosed in Korean Patent Laid-Open No. 2019-0036992 includes a first fixing unit, a second fixing unit, a first rotating unit, and a second rotating unit, and according to this lubricating oil supply unit, lubrication is performed regardless of the rotation direction of the rotating shaft. It is possible, and there is an advantage in that the efficiency of the motor can be designed differently depending on the direction of rotation.

However, in the case of the lubricant supply unit disclosed in Korean Patent Laid-Open No. 2019-0036992, a variation in the amount of oil supply may occur as follows.

Due to the tolerance of the first fixing part and the second fixing part, it is difficult to assemble while the outer circumference of the first fixing part and the inner circumference of the second fixing part are always concentric with each other. Accordingly, it is difficult to assemble the rotation center of the first rotation unit and the rotation center of the second rotation unit to a constant eccentricity, and the volume of the space portion between the first rotation unit and the second rotation unit is changed, resulting in a variation in the amount of oil supply.

In addition, in the case of the lubricating oil supply unit disclosed in Korean Patent Application Laid-Open No. 2019-0036992, leakage of lubricating oil may increase due to assembly dispersion, and there may be a problem in that the actual amount of oil is lowered.

One problem to be solved by the present invention is a structure capable of solving the problem of variations in the amount of oil supplied from the lubricant supply device and the problem of leakage of lubricant even when a tolerance of each component constituting the lubricant supply device of the reciprocating compressor occurs. It is to provide a lubricating oil supply device.

Another problem to be solved by the present invention is a lubricant supply device in which the degree of eccentricity of the rotation center of the inner gear and the rotation center of the outer gear, or the degree of coincidence, can be made constant regardless of the assembly tolerance of the lower cover, and It is to provide a reciprocating compressor.

Another problem to be solved by the present invention is a lubricant supply device and a reciprocating oil supply device capable of preventing the occurrence of oil supply deviation and smooth supply of lubricant even when a relative movement between the upper cover and the lower cover occurs after assembly of the lubricant supply device. It is to provide a compressor.

Another problem to be solved by the present invention is to provide a lubricant supply device and a reciprocating compressor capable of stably maintaining an inner space in which the inner gear and the outer gear are accommodated in the lubricant supply device.

In order to achieve the above object, a lubricating oil supply device and a reciprocating compressor according to an embodiment of the present invention are made as follows.

The lubricating oil supply device according to an embodiment of the present invention may be coupled to a rotating shaft of a reciprocating compressor to supply lubricating oil to an oil supply passage inside the rotating shaft.

The lubricating oil supply device may include a rotating part, an outer gear, and a fixing part.

In an embodiment of the present invention, the lubricant supply device may be made to be eccentric between the rotation center of the inner gear and the rotation center of the outer gear, and at this time, the eccentricity of the rotation center of the inner gear and the rotation center of the outer gear is the assembly tolerance of the lower cover. It is made to be irrelevant.

In the embodiment of the present invention, the lubricant supply device may be made so that the rotation center of the inner gear and the rotation center of the outer gear coincide, and at this time, the coincidence of the rotation center of the inner gear and the rotation center of the outer gear is the assembly tolerance of the lower cover. It is made to be irrelevant.

The rotating part includes a rotating body fixedly coupled to a lower side of the rotating shaft, an inner gear extending from a lower end of the rotating body, and an oil outlet formed inside the rotating body and the inner gear to communicate with the oil supply passage. It can be made including.

The rotating body may have a generally circular cross section along the vertical direction. The rotating body may have a generally cylindrical shape. However, the rotating body is fixedly coupled to the rotating shaft, and is configured not to rotate relative to the rotating shaft.

The oil outlet may be configured to vertically penetrate the rotating body and the inner gear.

The outer gear may be configured to surround the inner gear so that an oil transmission space is provided between the inner gear and the inner gear.

The fixing part forms an inner space in which the inner gear and the outer gear are accommodated, an oil inlet formed on a path through which the oil delivery space rotates as a hole through which lubricating oil is introduced, and communicates with the oil outlet and transmits the oil. It may include an oil chamber formed on a path through which the space turns.

The fixing part may include an upper cover and a lower cover.

The upper cover may include an upper plate and a first side wall.

In the upper plate, a cover hole through which the rotating body passes is formed.

In an embodiment of the present invention, the first side wall extends downward from the edge of the upper plate so that the eccentricity of the rotation center of the inner gear and the rotation center of the outer gear is irrelevant to the assembly tolerance of the lower cover, and extends the outer circumferential surface of the outer gear. It can be made to face and surround.

On the other hand, in the embodiment of the present invention, the first side wall extends downward from the edge of the upper plate so that the coincidence of the rotation center of the inner gear and the rotation center of the outer gear is irrelevant to the assembly tolerance of the lower cover. It may be made to face and surround the outer circumferential surface.

In an embodiment of the present invention, the lower cover may be coupled to a lower side of the upper cover to form the inner space.

The lower cover may include a lower plate, the oil inlet, and the oil chamber.

The lower plate may be formed to be in close contact with the bottom of the first sidewall.

The oil inlet may be configured to vertically penetrate the lower plate on a path through which the oil delivery space rotates.

The oil chamber may have a concave groove shape on an upper surface of the lower plate, communicate with the oil outlet, and may be formed on a path through which the oil delivery space rotates.

In an embodiment of the present invention, the outer peripheral surface of the rotating body and the cover hole may form a concentric circle.

In an embodiment of the present invention, an outer circumferential surface of the outer gear and an inner circumferential surface of the first sidewall may form a concentric circle.

In an embodiment of the present invention, a first tooth portion is formed along a circumferential direction on an outer peripheral surface of the inner gear, and a second tooth portion engaged with the first tooth portion is formed along the circumferential direction on the inner peripheral surface of the outer gear. I can.

In an embodiment of the present invention, the center of the outer circumferential surface of the rotating body, the center of the cover hole, the center of rotation of the inner gear, and the center of the first tooth are located on the rotation axis of the rotating body, and the center of the inner circumferential surface of the first side wall The center, the center of the outer circumferential surface of the outer gear, the center of rotation of the outer gear, and the center of the second tooth may be made eccentric in the rotation axis of the rotating body.

In an embodiment of the present invention, the center of the outer circumferential surface of the rotating body, the center of the cover hole, the rotation center of the inner gear, the center of the inner circumferential surface of the first side wall, the center of the outer circumferential surface of the outer gear, the rotation center of the outer gear , The center of the first tooth may be positioned on the rotation axis of the rotation body, and the center of the second tooth may be eccentric in the rotation axis of the rotation body.

In an embodiment of the present invention, the upper surface of the lower cover and the lower surface of the first side wall are in close contact with each other, and may be formed flat in a direction orthogonal to the rotation axis of the rotating body in a range in which they are in close contact with each other.

In an embodiment of the present invention, the upper cover includes a fastening piece extending downward from the first sidewall and having a first fastening hole, and the lower cover includes the lower cover being separated from the lower side of the upper cover. To prevent this, it may include a first fastening protrusion inserted into the first fastening hole and caught.

In an embodiment of the present invention, the lower cover includes: a lower plate in close contact with a lower surface of the first sidewall; And a second sidewall extending upward from the edge of the lower plate and in close contact with the outer circumferential surface of the first sidewall.

In an exemplary embodiment of the present invention, a second fastening hole may be formed in one of the first sidewall and the second sidewall, and a second fastening protrusion inserted into the second fastening hole may be formed in the other.

The reciprocating compressor according to an embodiment of the present invention may include a shell, the aforementioned lubricant supply device, a rotary shaft, a motor, a crank pin, a cylinder, a piston, and a connecting rod.

The shell forms an enclosed space, and may be configured to accommodate lubricant therein.

The lubricating oil supply device may be provided inside the shell and at least partially immersed in the lubricating oil inside the shell.

The rotary shaft may be coupled to the lower side of the lubricating oil supply device.

The motor is configured to rotate the rotation shaft about a rotation axis.

The crankpin may be positioned above the motor and disposed eccentrically in the rotation shaft to rotate.

The cylinder may be positioned above the motor and disposed in a horizontal direction.

The piston is configured to reciprocate within the cylinder.

The connecting rod connects the crankpin and the piston.

According to the lubricating oil supply device and the reciprocating compressor according to an embodiment of the present invention, the first side wall of the upper cover faces and surrounds the outer circumferential surface of the outer gear, and the lower cover is in close contact with and coupled to the lower end of the first side wall, The degree of eccentricity of the rotation center of the outer gear relative to the rotation center of the inner gear can be made constant regardless of the assembly tolerance of the lower cover.

According to the lubricating oil supply device and the reciprocating compressor according to an embodiment of the present invention, the first side wall of the upper cover is made to directly face and surround the outer circumferential surface of the outer gear, and the lower cover is in close contact with and coupled to the lower end of the first side wall. , The degree of coincidence of the rotation center of the outer gear relative to the rotation center of the inner gear can be made constant regardless of the assembly tolerance of the lower cover.

According to the lubricating oil supply device and the reciprocating compressor according to an embodiment of the present invention, the eccentricity of the outer gear relative to the inner gear is not affected by the assembly between the upper cover and the lower cover. This prevents the increase of the lubricant to prevent leakage of the lubricant (for example, it can prevent the lubricant from leaking between the rotating body and the top plate (cover hole)), and prevents the deviation of the amount of oil from increasing. I can.

According to the lubricating oil supply device and the reciprocating compressor according to an embodiment of the present invention, even when an assembly tolerance between the upper cover and the lower cover occurs, the oil delivery space can be kept constant, and the amount of oil supplied from the lubricating oil supply device The deviation of the can be reduced.

According to the lubricating oil supply device and the reciprocating compressor according to an embodiment of the present invention, the lower cover is in close contact with the lower end of the first side wall of the upper cover to form an inner space of the fixing unit, so that the lower cover is placed against the upper cover during assembly and use. Even if the horizontal direction of movement occurs, it is possible to prevent the occurrence of oil supply deviation and leakage of lubricant according to this, and smooth supply of lubricant oil.

According to the lubricating oil supply device and the reciprocating compressor according to an embodiment of the present invention, by including a first fastening hole and a first fastening protrusion, or by including a second fastening hole and a second fastening protrusion, the upper cover It is easy to combine the lower cover and the lower cover, and the inner space in which the inner gear and the outer gear are accommodated in the lubricant supply device can be stably maintained.

1 is a schematic cross-sectional view of a reciprocating compressor according to an embodiment of the present invention.
2 is a perspective view showing a lubricant supplying device according to an embodiment of the present invention.
3 is an exploded perspective view showing the lubricant supply device shown in FIG. 2.
FIG. 4 is a cross-sectional perspective view as viewed from A-A' in the lubricant supplying device shown in FIG. 2.
5 is a cross-sectional view (longitudinal cross-sectional view) viewed from A-A' in the lubricant oil supply device shown in FIG. 2.
6 is a cross-sectional view (cross-sectional view) viewed from B-B' in the lubricant oil supply device shown in FIG. 2.
7 is a cross-sectional view showing a lubricant supplying device according to another embodiment of the present invention.
8 is a perspective view showing a lubricating oil supply device according to another embodiment of the present invention.
9 is a cross-sectional view (longitudinal cross-sectional view) showing the lubricant oil supply device shown in FIG. 8.
10 is a view illustrating a gap between a first sidewall and an outer gear in a lubricant supplying device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings in order to describe the present invention in more detail. The same reference numerals denote the same elements throughout the detailed description.

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

In the reciprocating compressor 1 (hereinafter referred to as'compressor 1') according to an embodiment of the present invention, the piston 450 reciprocates in association with the rotation of the rotary shaft 410 in the space inside the compressor 1 While it is made to compress the fluid. The fluid described in the embodiments of the present invention may be formed of a gas or gaseous refrigerant.

In the following, first, in order to explain the overall structure and operation of the compressor 1 according to an embodiment of the present invention, the components constituting the compressor 1 and the operation of these components will be briefly described. In addition, the refrigerant will be described as an example of the fluid.

The compressor 1 includes a shell 100, and the shell 100 includes a lower shell 110 and an upper shell 120.

The inside of the shell 100 is sealed with the outside, and the inside of the shell 100 forms an inner space of the compressor 1. In the interior of the shell 100 (inside of the compressor 1), various parts constituting the compressor 1 are provided, and a refrigerant and a lubricant (oil) are accommodated. Lubricating oil is stored on the lower shell 110 and can circulate inside the shell 100. The refrigerant may be filled in a space other than a space in which the lubricating oil is accommodated.

The lower shell 110 is made in the form of a container opened upward, the upper shell 120 is made in the form of a container opened downward, and the upper part 115 of the lower shell 110 and the upper shell 120 The lower part 125 is coupled to each other to form a shell 100 forming a sealed inner space.

Legs 130 are coupled to the outer surface of the lower shell 110, and the legs 130 allow the compressor 1 to be fixed at a specific installation position. For example, when the compressor 1 according to the embodiment of the present invention constitutes a refrigerator, the legs 130 are fixed to a frame constituting the refrigerator so that the compressor 1 is fixed at a specific position of the refrigerator.

Two or more legs 130 may be provided, and may be coupled to the bottom surface of the lower shell 110.

A main body 400 is provided inside the shell, and several components constituting the compressor 1 are coupled to the main body 400.

The body 400 may be connected to the inner surface of the shell 100 (lower shell 110) through the elastic body 470, and the elastic body 470 may be formed in the form of a coil spring, and may be provided in plural.

The main body 400 may be provided with a motor 420 that generates power for operating the compressor 1. The motor 420 includes a stator 421 and a rotor 422.

In the compressor 1 according to an embodiment of the present invention, the motor 420 may have a form in which the stator 421 is formed relatively outside, and the rotor 422 is formed relatively inside.

In contrast, in the compressor 1 according to another embodiment of the present invention, the motor may have a form in which a stator is formed relatively inside and a rotor is formed relatively outside.

A rotation shaft 410 is formed in the center of the rotor 422, and the rotation shaft 410 rotates together with the rotor 422. In the compressor 1 according to the embodiment of the present invention, the rotation shaft 410 may be formed in a vertical direction (Z), and the rotation shaft 411 of the rotation shaft 410 is formed in a vertical direction.

An oil supply passage 412 through which lubricating oil moves is provided inside the rotating shaft 410. In addition, a lubricant supplying device 10 is provided on one side of the rotating shaft 410, and at least a part of the lubricant supplying device 10 may be immersed in the lubricating oil accommodated in the shell 100.

As the lubricating oil supply device 10 operates according to the rotation of the rotary shaft 410, the lubricating oil can move upward along the oil supply passage 412, and the lubricating oil discharged from the oil supply passage 412 is the compressor (1). Can be supplied to each part of the.

An additional description of the lubricant supplying device 10 according to an embodiment of the present invention will be described later.

A crank pin 430 is connected to the upper side of the rotating shaft 410. The crankpin 430 may be located above the motor 420. The crank pin 430 is disposed eccentrically on the rotation shaft 411 of the rotation shaft 410. Accordingly, when the rotation shaft 410 rotates, the crank pin 430 rotates while forming a predetermined rotation radius at a position eccentric from the rotation axis of the rotation shaft 410.

In the compressor 1 according to the embodiment of the present invention, a cylinder 440 having a generally cylindrical shape may be positioned above the motor 420 and disposed in a horizontal direction (X). The cylinder 440 may be formed integrally with the main body 400, or may be formed separately and then fixedly coupled to the main body 400.

The piston 450 reciprocates in the bore inside the cylinder 440 along the longitudinal direction of the cylinder 440 (axial direction of the cylinder 440). In the embodiment of the present invention, the direction in which the piston 450 reciprocates is defined as the front-rear direction (X).

The connecting rod 460 connects the crank pin 430 and the piston 450. The connecting rod 460 is coupled to be reciprocally rotatable with respect to the crankpin 430 and the axis 431 in the vertical direction, and reciprocally rotated with the piston 450 and the axis 451 in the vertical direction. Are combined.

Accordingly, when the rotation shaft 410 rotates, the crank pin 430 rotates eccentrically and the piston 450 reciprocates in the forward and backward directions.

In front of the cylinder 440, a cylinder head 480 is coupled, and a suction chamber 481 through which refrigerant flows into the cylinder 440 and a discharge chamber 482 through which the compressed refrigerant is discharged are provided.

The refrigerant may be compressed by the operation of the compressor 1 according to the embodiment of the present invention made as described above.

2 is a perspective view showing a lubricant supply device 10 according to an embodiment of the present invention, FIG. 3 is an exploded perspective view showing the lubricant supply device 10 shown in FIG. 2, and FIG. 4 is shown in FIG. It is a cross-sectional perspective view as viewed from A-A' in the lubricating oil supply device 10, and FIG. 5 is a cross-sectional view (longitudinal section) as viewed from A-A' in the lubricating oil supply device 10 shown in FIG.

Lubricating oil supply device 10 according to an embodiment of the present invention is coupled to the lower side of the rotary shaft 410 and operates, and some components constituting the lubricant supplying device 10 rotate together with the rotary shaft 410, and other Some configurations are made so as not to rotate together with the rotation shaft 410.

The lubricating oil supply device 10 according to an embodiment of the present invention may include a rotating part 200, an outer gear 240, and a fixing part 300.

The rotating part 200 may include a rotating body 210, an inner gear 220 and an oil outlet 230.

The rotating body 210 may have a circular cross section along the vertical direction Z. The rotating body 210 may have a cylindrical shape as a whole.

In an embodiment of the present invention, the rotating body 210 may be press-fit into the rotating shaft 410 from the bottom of the rotating shaft 410 and coupled to the rotating shaft 410.

In contrast, in another embodiment of the present invention, the lower end of the rotary shaft 410 may be press-fit into the upper end of the rotary body to be coupled.

In the compressor 1 according to the embodiment of the present invention, the rotating body 210 is fixedly coupled to the rotating shaft 410 and is configured not to rotate relative to the rotating shaft 410.

In the embodiment of the present invention, the rotation shaft S of the rotation body 210 may be the same as the rotation shaft 411 of the rotation shaft 410. That is, when the rotating shaft 410 is rotated, the rotating body 210 is not eccentric and may be rotated together with the rotating shaft 410.

The inner gear 220 may be formed to extend from the bottom of the rotating body 210. The inner gear 220 may extend integrally from the bottom of the rotating body 210 and may be formed in a shape having a larger diameter than the rotating body 210.

A first toothed portion 221 is formed on the outer circumferential surface of the inner gear 220.

The first tooth portion 221 is formed over the entire outer circumferential surface of the inner gear 220, and the peak portion 221a and the valley portion 221b are repeatedly formed along the outer circumferential surface of the inner gear 220 so that the first tooth portion 221 Can be achieved. The peak portion 221a of the first tooth portion 221 is a portion protruding radially outward from the inner gear 220, and the valley portion 221b of the first tooth portion 221 is from the inner gear 220 toward the center. It is a concave part.

The first tooth portion 221 of the inner gear 220 may be formed in a trochoidal shape.

In an embodiment of the present invention, the center C1 of the cross-section of the inner gear 220 may be the same as the center S of the cross-section of the rotating body 210. In the embodiment of the present invention, the rotation center O1 of the inner gear 220 may be the same as the rotation center of the rotation body 210.

The oil outlet 230 may be formed in the shape of a hole penetrating the inside of the rotating body 210 and the inner gear 220 up and down. The oil outlet 230 may be formed in the center of the rotating body 210 and the inner gear 220.

The oil outlet 230 communicates with the oil supply passage 412 and forms a passage through which the lubricating oil moves to the oil supply passage 412 through the lubricating oil supply device 10.

The outer gear 240 may be formed in a generally circular ring shape.

The outer gear 240 is made to surround the inner gear 220, and an oil transmission space 250 is provided between the outer gear 240 and the inner gear 220.

The outer circumferential surface of the outer gear 240 may be formed in a circular shape.

In one embodiment of the present invention, the center of the outer circumferential surface of the outer gear 240 may be made to coincide with the center of the inner circumferential surface of the outer gear 240 (see FIG. 6).

In another embodiment of the present invention, the center of the outer circumferential surface of the outer gear 240 may be deviated from the center of the inner circumferential surface of the outer gear 240 (see FIG. 7 ).

A second tooth portion 241 is formed on the inner circumferential surface of the outer gear 240.

The second tooth portion 241 is formed over the entire inner circumferential surface of the outer gear 240, and the ridge portion 241a and the valley portion 241b are repeatedly formed along the inner circumferential surface of the outer gear 240, and the second tooth portion 241 Can be achieved. The peak portion 241a of the second tooth portion 241 is a portion protruding from the inner gear 220 in the central direction, and the valley portion 241b of the second tooth portion 241 is from the inner peripheral surface of the inner gear 220 to the outside. It is a concave part.

The second tooth portion 241 of the outer gear 240 may be formed in a trochoidal shape.

In an embodiment of the present invention, the number of peaks 241a and valleys 241b forming the second tooth 241 is greater than the number of peaks 221a and valleys 221b forming the first tooth 221 A lot is done. When the number of peaks 241a and valleys 241b constituting the second tooth 241 is n, respectively, the number of peaks 221a and valleys 221b constituting the first tooth 221 is n, respectively. It consists of a number less than -1 (n is a natural number).

For example, when the number of the peaks 241a and the valleys 241b constituting the second tooth 241 is 8, the number of the peaks 221a and the valleys 221b constituting the first tooth 221 Each can be made up of seven.

In addition, when the number of peaks 241a and valleys 241b constituting the second tooth portion 241 is 9, the number of peaks 221a and valleys 221b forming the first tooth portion 221 is respectively It can be made up of eight.

The second toothed portion 241 of the outer gear 240 is formed so that a part of the first toothed portion 221 of the inner gear 220 is engaged. Accordingly, the oil delivery space 250, which is a space provided between the inner gear 220 and the outer gear 240, varies in size and shape along the circumferential direction of the inner gear 220 and the outer gear 240. It is made in the form.

As the inner gear 220 and the outer gear 240 rotate, the oil delivery space 250 also rotates, and the oil delivery space 250 rotates based on the rotation center O1 of the inner gear 220. do. In one embodiment of the present invention, the oil delivery space 250 can rotate while its shape is changed, and in another embodiment of the present invention, the oil delivery space 250 can rotate while maintaining its shape.

In an embodiment of the present invention, when the rotating part 200 and the outer gear 240 are rotated, the fixing part 300 is not rotated, and for this purpose, the fixing part 300 may be connected to the main body 400.

In the lubricating oil supply device 10 according to an embodiment of the present invention, the fixing part 300 is made in the form of a case accommodating the inner gear 220 and the outer gear 240, and the inner space 301 and the oil inlet ( 323 and an oil chamber 324.

It is the inner space of the fixed part 300 of the inner space 301, and the inner gear 220 and the outer gear 240 are located in the inner space 301 of the fixed part 300.

The oil inlet 323 is formed in the form of a hole penetrating the fixing part 300, and the lubricant outside the fixing part 300 (inside the shell 100) through the oil inlet 323 is It may be introduced into the inner space 301. The oil inlet 323 is formed on the path through which the oil delivery space 250 rotates.

Therefore, as the inner gear 220 and the outer gear 240 rotate, the oil inlet 323 may communicate with the oil delivery space 250, and the oil delivery space 250 passing through the oil inlet 323 As the size (volume) is varied, the lubricant may move from the oil inlet 323 to the oil delivery space 250.

The oil chamber 324 may have a concave groove shape on the inner surface of the fixing part 300. The oil chamber 324 may be divided into a curved section 324a and a straight section 324b connected to each other.

The oil chamber 324 communicates with the oil outlet 230. In addition, the oil chamber 324 is formed on a path through which the oil delivery space 250 rotates. Specifically, the curved section 324a of the oil chamber 324 is formed on the path in which the oil delivery space 250 rotates, and the straight section 324b of the oil chamber 324 is in communication with the oil outlet 230. I can.

Therefore, as the inner gear 220 and the outer gear 240 rotate, the oil chamber 324 may communicate with the oil delivery space 250, and the oil delivery space 250 passing through the oil chamber 324 As the size (volume) is varied, the lubricant may move from the oil delivery space 250 toward the oil chamber 324.

In the lubricating oil supply device 10 according to an embodiment of the present invention, the fixing part 300 may include an upper cover 310 and a lower cover 320.

The upper cover 310 may include an upper plate 311 and a first side wall 312.

The upper plate 311 may be formed in a plate shape having a predetermined area, and may be formed in a flat plate shape in a horizontal direction (a direction orthogonal to Z). The upper plate 311 may be formed in a generally circular plate shape, and a cover hole 313 penetrating in the vertical direction is formed in the center of the upper plate 311. The cover hole 313 is formed in a circular shape, and the rotating body 210 is inserted into the cover hole 313 when the rotating part 200 and the upper cover 310 are assembled.

The upper cover 310 and the rotating part 200 are made to rotate relative to each other, and when the rotating part 200 rotates together with the rotating shaft 410, the upper cover 310 is not rotated.

In an embodiment of the present invention, the outer circumferential surface of the rotating body 210 and the cover hole 313 form concentric circles with each other. The diameter of the cover hole 313 is slightly larger than the outer diameter of the rotating body 210, but the diameter of the cover hole 313 is rotated to the extent that rotation of the rotating part 200 relative to the upper cover 310 is not obstructed. It may be formed to have substantially the same size as the outer diameter of the body 210.

The first side wall 312 may extend downward from the entire edge of the upper plate 311 and face and surround the outer circumferential surface of the outer gear 240.

The inner circumferential surface of the first side wall 312 and the outer circumferential surface of the outer gear 240 form concentric circles with each other. The diameter of the inner circumferential surface of the first side wall 312 is made slightly larger than the diameter of the outer circumferential surface of the outer gear 240, so that rotation of the outer gear 240 relative to the upper cover 310 is not obstructed, the first side wall The diameter of the inner circumferential surface of 312 may be substantially the same as the diameter of the outer circumferential surface of the outer gear 240.

In the lubricating oil supply device 10 according to the embodiment of the present invention, the inner circumferential surface of the first side wall 312 is made to directly face the outer circumferential surface of the outer gear 240. That is, the outer gear 240 is formed to rotate within the space formed by the inner circumferential surface of the first side wall 312, and a different configuration between the first side wall 312 and the outer gear 240, for example, a lower cover It is made so that a part of 320 is not intervened.

Accordingly, in the lubricating oil supply device 10 according to the embodiment of the present invention, the eccentricity of the rotation center O2 of the outer gear 240 relative to the rotation center O1 of the inner gear 220 is lower cover 320 ) Can be made irrespective of the assembly tolerance.

On the other hand, in the embodiment of the present invention, the matching of the rotation center O1 of the inner gear 220 and the rotation center O2 of the outer gear 240 may be made irrespective of the assembly tolerance of the lower cover 320. have.

That is, the oil delivery space 250 provided between the inner gear 220 and the outer gear 240 is not changed by the tolerance when the lower cover 320 is formed or the tolerance when the lower cover 320 is assembled.

In the embodiment of the present invention, the lower cover 320 may be coupled to the lower side of the upper cover 310 to form the inner space 301 of the fixing part 300.

The lower cover 320 may include a lower plate 321, an oil inlet 323 and an oil chamber 324.

The lower plate 321 may be formed in a plate shape having a predetermined area, and may be formed in a plate shape having a predetermined area along a horizontal direction (a direction orthogonal to Z). The upper surface of the lower plate 321 may be formed to be in close contact with the lower end of the first side wall 312.

The above-described oil inlet 323 may be formed to penetrate the lower plate 321 up and down on the path in which the oil delivery space 250 rotates.

In addition, the above-described oil chamber 324 may be formed in a concave groove shape on the upper surface of the lower plate 321, communicate with the oil outlet 230, and be formed on a path through which the oil delivery space 250 rotates.

6 is a cross-sectional view (cross-sectional view) viewed from B-B' in the lubricant supplying device 10 shown in FIG. 2.

In one embodiment of the present invention, the first side wall 312 may have an inner circumference and an outer circumference of the first side wall 312 formed in a circle, but eccentric to each other. That is, the first sidewall 312 may be formed in a shape whose thickness is not constant and varies along the circumferential direction.

In an embodiment of the present invention, the center of the outer circumferential surface of the rotating body 210, the center of the cover hole 313, the center of rotation O1 of the inner gear 220, and the center of the first tooth 221 (C1) Is located on the rotation axis S of the rotating body 210, the center of the inner circumferential surface of the first side wall 312, the center of the outer circumferential surface of the outer gear 240, the rotation center O2 of the outer gear 240 and the second The center C2 of the teeth 241 may be made eccentric in the rotation axis S of the rotation body 210. At this time, the center of the inner circumferential surface of the first side wall 312, the center of the outer circumferential surface of the outer gear 240, the rotation center O2 of the outer gear 240 and the center C2 of the second tooth part 241 coincide with each other. can do.

In the embodiment of the present invention made as described above, as the inner gear 220 and the outer gear 240 engage with each other and rotate, the point at which the inner gear 220 and the outer gear 240 engage with each other is variable, and oil transfer The space 250 may rotate based on the rotation center O1 of the inner gear 220 while the shape and size thereof are varied.

At this time, the inner gear 220 and the outer gear 240 are made to have different rotational speeds.

And as the size (volume) of the oil delivery space 250 passing through the oil inlet 323 increases when the inner gear 220 rotates clockwise based on FIG. 6, the oil delivery space 250 from the oil inlet 323 is increased. ), and as the size (volume) of the oil delivery space 250 passing through the oil chamber 324 decreases, the lubricating oil can move from the oil delivery space 250 to the oil chamber 324, thereby Accordingly, the lubricating oil may be supplied to the oil supply passage 412 through the oil outlet 230.

7 is a cross-sectional view showing a lubricant supplying device 10 according to another embodiment of the present invention.

In one embodiment of the present invention, the first side wall 312 may be formed so that the inner and outer circumferences thereof form a circle and are concentric with each other. That is, the first sidewall 312 may have a constant thickness along the circumferential direction.

In an embodiment of the present invention, the center of the outer circumferential surface of the rotating body 210, the center of the cover hole 313, the rotation center of the inner gear 220 (O1), the center of the inner circumferential surface of the first side wall 312, the outer gear The center of the outer circumferential surface of (240), the center of rotation (O2) of the outer gear (240), the center (C1) of the first tooth 221 is located on the rotation axis (S) of the rotating body (210), the second tooth The center C2 of the mold part 241 may be made eccentric in the rotation axis S of the rotation body 210.

At this time, as the inner gear 220 and the outer gear 240 engage with each other and rotate, the point where the inner gear 220 and the outer gear 240 engage with each other is maintained, and the oil transmission space 250 has a shape While being maintained, it can rotate based on the rotation center of the inner gear 220.

And as the inner gear 220 and the outer gear 240 rotate clockwise or counterclockwise based on FIG. 7, the size (volume) of the oil delivery space 250 communicating with the oil inlet 323 increases. When the lubricant oil can move from the oil inlet 323 to the oil delivery space 250, and when the size (volume) of the oil delivery space 250 communicated with the oil chamber 324 decreases, the oil delivery space 250 ), the lubricating oil may move toward the oil chamber 324, and accordingly, the lubricating oil may be supplied to the oil supply passage 412 through the oil outlet 230.

In the exemplary embodiment of the present invention, the lower surface of the first side wall 312 and the upper surface of the lower cover 320 may be parallel to each other and may be made flat. The lower surface of the first side wall 312 and the upper surface of the lower cover 320 may be made flat in a direction orthogonal to the rotation axis S of the rotating body 210, and may be made flat in a horizontal direction.

In addition, the upper surface of the lower cover 320 and the lower surface of the first sidewall 312 may be in close contact with each other.

In an embodiment of the present invention, the upper cover 310 may include a fastening piece 314, and the lower cover 320 may include a first fastening protrusion 325.

The fastening piece 314 extends downward from the first side wall 312. In the upper cover 310, a plurality of fastening pieces 314 may be provided, and the fastening pieces 314 may be repeatedly formed while being spaced apart along the circumferential direction of the upper cover 310.

A first fastening hole 314a is formed in the fastening piece 314. The first fastening hole 314a may have a concave groove shape or a through hole shape.

The first fastening protrusion 325 is formed to be inserted into and caught in the first fastening hole 314a of the fastening piece 314. The first fastening protrusion 325 may be formed to increase the degree of protrusion toward the lower side.

As the fastening piece 314 and the first fastening protrusion 325 are elastically deformed, the first fastening protrusion 325 is inserted into the first fastening hole 314a, and the lower end of the first fastening protrusion 325 is the fastening piece 314 ) Can be hung on the lower part of it.

The first fastening protrusion 325 in the lower cover 320 may be provided in plural, and may be repeatedly formed while being spaced apart along the circumferential direction of the lower cover 320. The number of the first fastening protrusions 325 formed on the lower cover 320 is the same as the fastening piece 314, and the position of the first fastening protrusion 325 is corresponding to the first fastening hole 314a. Is formed in the position.

The lower end of the first side wall 312 is in close contact with the upper surface of the lower cover 320 while the fastening piece 314 and the first fastening protrusion 325 are engaged with each other.

8 is a perspective view showing a lubricant supplying device 10 according to another embodiment of the present invention, FIG. 9 is a cross-sectional view (longitudinal cross-sectional view) showing the lubricant supplying device 10 shown in FIG. 8, and FIG. It is a view for explaining the gap between the first side wall 312 and the outer gear 240 in the lubricant supply device 10 according to an embodiment of the present invention.

In an embodiment of the present invention, when the rotating part 200 and the outer gear 240 are rotated, the fixing part 300 is not rotated. To this end, the fixing body 350 may be coupled to the fixing part 300, and the fixing body 350 may be coupled to the main body 400 and the like. The fixing body 350 may be formed in a wire-like shape, and may be made to prevent rotation of the fixing part 300 while being fitted into the fixing hole 326 of the lower cover 320.

In the embodiment of the present invention, the lower cover 320 may include a lower plate 321 and a second side wall 322.

The lower plate 321 is made to have a predetermined area in the horizontal direction, and the upper surface of the lower plate 321 is in close contact with the lower surface of the first side wall 312.

The second sidewall 322 extends upward from the edge of the lower plate 321 and is formed to be in close contact with the outer peripheral surface of the first sidewall 312. That is, the second sidewall 322 is formed in a circular shape, and is made to be in close contact while surrounding the first sidewall 312.

At this time, a second fastening hole 327 is formed in one of the first side wall 312 and the second side wall 322, and a second fastening protrusion 317 is inserted into and caught in the second fastening hole 327 in the other. Can be formed. The second fastening hole 327 and the second fastening protrusion 317 may be provided in plurality, respectively.

In an embodiment of the present invention, a second fastening hole 327 may be formed on an inner circumferential surface of the second side wall 322, and a second fastening protrusion 317 may be formed on an outer circumferential surface of the first side wall 312. At this time, the second fastening hole 327 may have a concave groove shape or a through hole shape. The second fastening protrusion 317 is inserted into and caught in the second fastening hole 327. The second fastening protrusion 317 may be formed to increase the degree of protrusion toward the upper side, and the first side wall 312, the second side wall 322, and the second fastening protrusion 317 are elastically deformed to make the second fastening. The protrusion 317 may be inserted into the second fastening hole 327 and the upper portion of the second sidewall 322 may be caught on the upper end of the second fastening protrusion 317.

In the lubricating oil supply device 10 according to the embodiment of the present invention, the gap G between the outer circumferential surface of the outer gear 240 and the inner circumferential surface of the first side wall 312 may be determined as follows.

The gap between the outer circumferential surface of the outer gear 240 and the inner circumferential surface of the first side wall 312 is G, the radius of the inner circumferential surface of the first side wall 312 is a, and the first side wall with respect to the center S of the rotating body 210 ( The eccentricity of the center of the inner circumferential surface of 312) is b, the radius of the cover hole 313 is c, the radius of the rotating body 210 is d, the center of rotation O1 of the inner gear 220 and the peak of the inner gear 220 (221a) the concentricity of the tangent line is e, the radius of the tangent line of the peak (221a) of the inner gear 220 is f, the radius of the tangent line of the peak (241a) of the outer gear 240 is g, the outer peripheral surface and the outside of the outer gear 240 When the concentricity of the tangent line of the peak 241a of the gear 240 is h, and the radius of the outer circumferential surface of the outer gear 240 is i, G is the following [Equation 1].

[Equation 1]

G=a+b-c+d-e-f+g-h-i

That is, the gap between the outer circumferential surface of the outer gear 240 and the inner circumferential surface of the first side wall 312 in the lubricating oil supply device 10 according to the embodiment of the present invention is the nine factors (a, b, c, d, e, It is determined by f, g, h, i).

Unlike the embodiment of the present invention, in the case of a lubricant supply unit disclosed in Korean Patent Laid-Open Publication No. 2019-0036992, in addition to the nine factors, the inner diameter of the side wall of the first fixing portion and the side wall of the first fixing portion The eccentricity of the center of the inner circumferential surface of the side wall of the first fixing part with respect to the outer diameter and the rotating shaft must also be considered.Compared with the embodiment of the present invention, the difference in the amount of oil supply may increase as the difference in spacing between parts forming the lubricant supply part increases. I can.

As described above, according to the lubricating oil supply device 10 and the reciprocating compressor 1 according to the embodiment of the present invention, the lower cover 320 is in close contact with the lower end of the first side wall 312 of the upper cover 310 As the internal space 301 of the fixing part 300 is formed, even if the horizontal movement of the lower cover 320 with respect to the upper cover 310 occurs during assembly and use, the occurrence of deviation in the amount of oil supply is prevented and smooth Lubricating oil supply can be made.

In addition, by including the first fastening hole 314a and the first fastening protrusion 325, or by including the second fastening hole 327 and the second fastening protrusion 317, the upper cover 310 The combination of the lower cover 320 is easy and stable, and the inner space 301 in which the inner gear 220 and the outer gear 240 are accommodated in the lubricant supply device 10 can be stably maintained. .

In the above, although specific embodiments of the present invention have been described and illustrated, the present invention is not limited to the described embodiments, and those of ordinary skill in the art may variously modify other specific embodiments without departing from the spirit and scope of the present invention. It will be appreciated that it can be modified and transformed. Accordingly, the scope of the present invention should not be determined by the described embodiments, but should be determined by the technical idea described in the claims.

1: Reciprocating compressor 10 Lube oil supply device
100: shell 110: lower shell
120: upper shell 130: leg
200: rotating part 210: rotating body
220: inner gear 221: first tooth portion
230: oil outlet 240: outer gear
241: second tooth 250: oil delivery space
300: fixed part 301: internal space
310: upper cover 311: upper plate
312: first side wall 313: cover hole
314: fastening piece 314a: first fastening hole
317: second fastening protrusion 320: lower cover
321: lower plate 322: second side wall
323: oil inlet 324: oil chamber
325: first fastening protrusion 327: second fastening hole
400: main body
410: rotary shaft 412: oil supply flow path
420: motor 421: stator
422: rotor 430: crankpin
440: cylinder 450: piston
460: connecting rod 470: elastic body
480: cylinder head 481: suction chamber
482: discharge chamber

Claims (13)

In the lubricating oil supply device coupled to the rotating shaft to supply lubricating oil to the oil supply passage inside the rotating shaft,
A rotating part including a rotating body fixedly coupled to a lower side of the rotating shaft, an inner gear extending from a lower end of the rotating body, and an oil outlet formed inside the rotating body and the inner gear to communicate with the oil supply passage;
An outer gear surrounding the inner gear so that an oil transmission space is provided between the inner gear; And
An oil inlet formed on a path through which the oil delivery space turns as a hole that forms an internal space in which the inner gear and the outer gear are accommodated, and the oil delivery space is in communication with the oil outlet and the oil delivery space turns. It includes a fixing portion including an oil chamber formed on the path,
The fixing part,
An upper cover including an upper plate having a cover hole through which the rotating body penetrates, and a first sidewall extending downward from an edge of the upper plate and facing and surrounding an outer circumferential surface of the outer gear; And
Comprising a lower cover coupled to the lower side of the upper cover to form the inner space,
Lubricating oil supply. The method of claim 1,
The oil inlet and the oil chamber are formed in the lower cover,
Lubricating oil supply. The method of claim 1,
The outer circumferential surface of the rotating body and the cover hole form a concentric circle,
The outer circumferential surface of the outer gear and the inner circumferential surface of the first side wall form a concentric circle,
Lubricating oil supply. The method of claim 3,
A first tooth portion is formed along the circumferential direction on the outer circumferential surface of the inner gear,
On the inner circumferential surface of the outer gear, a second tooth portion engaged with the first tooth portion is formed along the circumferential direction,
Lubricating oil supply. The method of claim 4,
The center of the outer circumferential surface of the rotating body, the center of the cover hole, the center of rotation of the inner gear, and the center of the first tooth are located on the axis of rotation of the rotating body,
The center of the inner circumferential surface of the first side wall, the center of the outer circumferential surface of the outer gear, the rotation center of the outer gear and the center of the second tooth are eccentric from the rotation axis of the rotating body,
Lubricating oil supply. The method of claim 4,
Center of the outer circumferential surface of the rotating body, the center of the cover hole, the center of rotation of the inner gear, the center of the inner circumferential surface of the first side wall, the center of the outer circumferential surface of the outer gear, the center of rotation of the outer gear, the center of the first tooth Is located on the rotation axis of the rotating body,
The center of the second tooth portion is eccentric from the rotation axis of the rotating body,
Lubricating oil supply. The method of claim 1,
The upper surface of the lower cover and the lower surface of the first side wall are in close contact with each other, and are flat in a direction perpendicular to the rotation axis of the rotating body in a range in which they are in close contact with each other,
Lubricating oil supply. The method of claim 7,
The upper cover,
It includes a fastening piece extending downward from the first sidewall and having a first fastening hole,
The lower cover,
Including a first fastening protrusion inserted into the first fastening hole so as to prevent the lower cover from being separated from the lower side of the upper cover,
Lubricating oil supply. The method of claim 7,
The lower cover,
A lower plate in close contact with the lower surface of the first sidewall; And
It includes a second sidewall extending upward from the edge of the lower plate and in close contact with the outer circumferential surface of the first sidewall,
Lubricating oil supply. The method of claim 9,
A second fastening hole is formed in one of the first sidewall and the second sidewall, and a second fastening protrusion is formed in the other to be inserted into and caught in the second fastening hole,
Lubricating oil supply. A rotating part including a rotating body, an inner gear extending from a lower end of the rotating body and having a first toothed portion formed on an outer circumferential surface thereof, and an oil outlet vertically penetrating the rotating body and the inner gear;
An outer gear that surrounds the inner gear so that an oil transmission space is provided between the inner gear and a second tooth portion is formed on an inner circumferential surface of the first tooth portion and partially meshes with the first tooth portion;
An upper cover including an upper plate having a circular cover hole through which the rotating body passes, and a first sidewall extending downward from an edge of the upper plate and facing and surrounding an outer circumferential surface of the outer gear; And
A lower plate in close contact with the lower end of the first side wall, an oil inlet through which the lower plate is vertically penetrated on a path through which the oil transfer space is rotated, and a concave groove form on the upper surface of the lower plate and in communication with the oil outlet. Including a lower cover including an oil chamber formed on the path in which the oil delivery space is orbiting,
Lubricating oil supply. The method of claim 11,
The center of the outer circumferential surface of the rotating body, the center of the cover hole, the center of rotation of the inner gear, and the center of the first tooth are located on the axis of rotation of the rotating body,
The center of the inner circumferential surface of the first side wall, the center of the outer circumferential surface of the outer gear, the rotation center of the outer gear and the center of the second tooth are eccentric from the rotation axis of the rotating body,
Lubricating oil supply. A shell forming an enclosed space and receiving lubricating oil therein;
The lubricating oil supply device according to any one of claims 1 to 12, wherein at least a part of the lubricating oil is immersed in the lubricating oil;
A rotary shaft to which the lubricant supply device is coupled to a lower side;
A motor that rotates the rotation shaft about a rotation shaft;
A crank pin positioned on the upper side of the motor and eccentrically disposed on the rotation shaft to rotate;
A cylinder positioned above the motor and disposed in a horizontal direction;
A piston reciprocating within the cylinder; And
Including a connecting rod connecting the crankpin and the piston,
Reciprocating compressor.

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