WO2023153704A1

WO2023153704A1 - Rotary compressor and home appliance comprising same

Info

Publication number: WO2023153704A1
Application number: PCT/KR2023/001439
Authority: WO
Inventors: 이정배
Original assignee: 삼성전자주식회사
Priority date: 2022-02-10
Filing date: 2023-02-01
Publication date: 2023-08-17
Also published as: KR20230121233A

Abstract

A rotary compressor is disclosed. The rotary compressor comprises: a case in which oil is retained; a cylinder which is disposed within the case, has an inner space, and includes a rolling piston eccentrically orbiting in the inner space and a vane coming into contact with the rolling piston to divide the inner space into a suction chamber and a compression chamber; a drive device which includes a rotating shaft connected to the rolling piston and a motor for rotating the rotating shaft; and first and second flanges which are disposed at the top and bottom of the cylinder respectively to close the inner space, wherein each of the first and second flanges includes a lobe bearing passed through by the rotating shaft and including an inner wall the cross section of which has an elliptical shape.

Description

Rotary compressor and home appliances including the same

The present disclosure relates to a rotary compressor in which an inner wall rotatably supporting a rotary shaft of a flange member has a shape of a lobe bearing in order to improve performance and reliability of the compressor, and a home appliance including the same.

A compressor is a mechanical device that increases pressure by compressing air, refrigerant, or other various working gases using a motor or turbine. Compressors can be used in various industries throughout the industry, and when used in a refrigerant cycle, they can convert low-pressure refrigerant into high-pressure refrigerant and deliver it back to the condenser.

Compressors are broadly classified. A reciprocating compressor that compresses refrigerant while the piston makes a linear reciprocating motion inside the cylinder by forming a compression space in which the working gas is sucked and discharged between the piston and the cylinder, and the working gas between the orbiting scroll and the fixed scroll. A compression space in which the gas is sucked and discharged is formed, so that a compression space in which the working gas is sucked and discharged is formed between the scroll compressor for compressing the refrigerant while the orbiting scroll rotates along the fixed scroll, and the rolling piston and the cylinder rotating eccentrically. It is divided into a rotary compressor that compresses the refrigerant while the rolling piston rotates eccentrically along the inner wall of the cylinder.

A rolling piston of a rotary compressor receives pressure from refrigerant stored in a suction chamber and a compression chamber of a cylinder, respectively. Accordingly, periodic pressure is applied to the rotation shaft connected to the rolling piston, and the flange member penetrated by the rotation shaft receives periodic pressure through oil injected between the rotation shaft and the flange member.

An object of the present disclosure is to provide a rotary compressor in which an inner wall rotatably supporting a rotary shaft of a flange member has a lobe bearing shape and a home appliance including the same in order to improve performance and reliability of the compressor.

A rotary compressor according to an embodiment of the present disclosure includes a case in which oil is stored, a rolling piston that is disposed inside the case, has an inner space, and has an eccentric rotation in the inner space, and is in contact with the rolling piston. A cylinder including a vane dividing the inner space into a suction chamber and a compression chamber, a driving device including a rotating shaft connected to the rolling piston and a motor rotating the rotating shaft, and disposed above and below the cylinder, respectively, to close the internal space. It may include a first flange and a second flange, wherein the first flange and the second flange are penetrated by the rotation shaft and may include a lobe bearing including an inner wall having an elliptical cross section.

The inner wall of the lobe bearing has a long axis disposed along a first axis, the vane moves reciprocally along a second axis, and the first axis rotates from 0 degrees to 90 degrees in a rotational direction of the rotation axis with respect to the second axis. It can be arranged rotated by degrees.

The inner wall of the lobe bearing may have a major axis of a first length and a minor axis of a second length, and the first length may be 1.1 to 2.0 times the second length.

The inner wall of the lobe bearing may include two circular arc walls symmetrically disposed with respect to a long axis.

The rotary shaft may include an oil passage space formed therein in a longitudinal direction and an oil supply hole communicating the oil passage space and the outside of the rotary shaft.

A lower end of the rotating shaft may be disposed adjacent to a lower surface of the case so as to be immersed in oil.

The cylinder may include a discharge port communicating with the compression chamber, and the first flange may include a valve member disposed at the discharge port and opening the discharge port when the pressure inside the compression chamber is greater than or equal to a predetermined pressure. there is.

The case includes a suction port into which a low-pressure refrigerant flows, and the cylinder includes a suction port communicating the suction port and the suction chamber and disposed along a third axis, and the third axis includes the second axis. As a reference, it may be rotated by 0 degrees to 90 degrees in the direction of rotation of the rotation shaft.

The motor includes a rotor disposed on an upper side of the first flange, disposed to surround the rotation shaft and rotating together with the rotation shaft, and a stator fixed to an inner surface of the case and rotatably supporting the rotor. can do.

A home appliance for controlling temperature through heat exchange with the outside using a refrigerant according to an embodiment of the present disclosure includes a rotary compressor, and the rotary compressor is disposed inside a case in which oil is stored, and the case , A rolling piston having an inner space and having an eccentric rotation in the inner space, a cylinder including a vane in contact with the rolling piston and partitioning the inner space into a suction chamber and a compression chamber, a rotating shaft connected to the rolling piston, and the rotating shaft A driving device including a motor for rotating and a first flange and a second flange disposed on top and bottom of the cylinder to close the inner space, the first flange and the second flange, the rotating shaft It may include a lobe bearing that is penetrated by and includes an inner wall having an elliptical cross section.

The inner wall of the lobe bearing has a long axis disposed along a first axis, and the vane reciprocates along a second axis, and the first axis is 0 to 90 degrees in the direction of rotation of the rotation axis with respect to the second axis. It can be rotated and arranged as much as possible.

The home appliance may be one of an air conditioner, a refrigerator, and a freezer.

1 is a perspective view of a rotary compressor according to an embodiment of the present disclosure.

2 is a cross-sectional view of a rotary compressor according to an embodiment of the present disclosure.

3 is an exploded perspective view of a rotary compressor according to an embodiment of the present disclosure.

4 is a view showing a process in which pressure is transmitted to a lobe bearing.

Fig. 5 is a view showing an arrangement structure of lobe bearings.

6 is a view showing the pressure applied to the lobe bearing according to the rotation angle of the rotation shaft.

7 is a cross-sectional view of a lobe bearing according to an embodiment of the present disclosure.

Embodiments described below are shown by way of example to aid understanding of the present disclosure, and it should be understood that the present disclosure may be implemented with various modifications, different from the embodiments described herein. However, in the following description of the present disclosure, when it is determined that a detailed description of a related known function or component may unnecessarily obscure the subject matter of the present disclosure, the detailed description and specific illustration thereof will be omitted. In addition, the accompanying drawings are not drawn to an actual scale to aid understanding of the disclosure, and the dimensions of some components may be exaggerated.

The terms used in this specification and claims are general terms in consideration of the function of the present disclosure. However, these terms may vary depending on the intention of a technician working in the field, legal or technical interpretation, and the emergence of new technologies. In addition, some terms are arbitrarily selected by the applicant. These terms may be interpreted as the meanings defined in this specification, and if there is no specific term definition, they may be interpreted based on the overall content of this specification and common technical knowledge in the art.

In this specification, expressions such as “has,” “can have,” “includes,” or “can include” indicate the existence of a corresponding feature (eg, numerical value, function, operation, or component such as a part). , which does not preclude the existence of additional features.

And, in this specification, since the components necessary for the description of each embodiment of the present disclosure have been described, it is not necessarily limited thereto. Accordingly, some components may be changed or omitted, and other components may be added. In addition, it may be distributed and arranged in different independent devices.

Furthermore, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings and contents described in the accompanying drawings, but the present disclosure is not limited or limited by the embodiments.

Hereinafter, the present disclosure will be described in more detail with reference to the accompanying drawings.

1 is a perspective view of a rotary compressor according to an embodiment of the present disclosure. 2 is a cross-sectional view of a rotary compressor according to an embodiment of the present disclosure. 3 is an exploded perspective view of a rotary compressor according to an embodiment of the present disclosure.

As shown in FIG. 1, the refrigeration cycle has four processes of compression, condensation, expansion, and evaporation, and the four processes of compression, condensation, expansion, and evaporation include a rotary compressor 1, a condenser 2, and a refrigerant. It is generated while circulating the expansion valve (3) and the evaporator (4).

The rotary compressor (1) compresses and discharges the refrigerant gas in a high-temperature, high-pressure state, and the high-temperature and high-pressure refrigerant gas discharged from the rotary compressor (1) flows into the condenser (2).

In the condenser 2, the refrigerant compressed in the compressor 1 is condensed into a liquid phase, and heat is released to the surroundings through the condensation process.

The expansion valve 3 expands the high-temperature, high-pressure refrigerant condensed in the condenser 2 into a low-pressure state, and the evaporator 4 evaporates the refrigerant expanded in the expansion valve 3 while using the latent heat of vaporization to cool the object. It functions to return the refrigerant gas in a low-temperature and low-pressure state to the rotary compressor 1 by evaporating while achieving a refrigeration effect by heat exchange with the refrigerant, and through this cycle, it is possible to adjust the air temperature in the indoor space.

In addition, the home appliance having such a cooling cycle may be one of an air conditioner, a refrigerator, and a freezer. However, it is not limited thereto and may be used in various home appliances having a cooling cycle.

The rotary compressor (1) is connected to the evaporator (4) and is connected to the suction port (11) for introducing the refrigerant from the evaporator (4), the condenser (2), and the refrigerant compressed at high temperature and high pressure in the rotary compressor (1) is discharged A discharge port 12 may be included.

An accumulator 5 may be disposed in the suction port 11 of the rotary compressor 1 and the evaporator 4 . The accumulator 5 temporarily accommodates the refrigerant that does not reach the gas and exists in the liquid phase among the low-temperature, low-pressure refrigerant delivered from the evaporator 4, and can prevent the liquid refrigerant from flowing into the rotary compressor 1. That is, only liquid refrigerant remains inside the accumulator A, and gaseous refrigerant may flow into the rotary compressor 1 .

The rotary compressor 1 includes a case 10 forming an exterior and a compression unit provided inside the case 10 to compress the refrigerant introduced through the suction port 11 and a driving device connected to the compression unit to drive the compression unit. (200).

The compression unit may include a cylinder 100 , a first cylinder 300 , and a second cylinder 400 .

The case 10 may partition the inside of the case 10 from the outside, and may be sealed from the outside so that the refrigerant compressed in the rotary compressor 1 flows out only through the discharge port 12 . The shape of the case 10 may vary as needed. The case 10 may include a suction port 11 into which a low-pressure refrigerant flows.

The driving device 200 includes a stator 220 fixed to the inner surface of the case 10, a rotor 221 rotatably installed inside the stator 220, and a rotor inside the rotor 221. It may include a rotation shaft 210 provided to rotate together with (221).

The rotating shaft 210 may be connected to the compression unit to rotate the rolling piston 110 of the compression unit to compress the refrigerant introduced into the compression unit. An eccentric part 214 may be disposed between the rotating shaft 210 and the rolling piston 110 .

Accordingly, the drive device 200 may be connected to the compression unit through the rotating shaft 210 to transmit power to the compression unit.

1 to 3, the rotary compressor 1 according to an embodiment of the present disclosure includes a case 10, a cylinder 100, a driving device 200, a first flange 300, and a second flange. (400).

Oil O may be stored in the lower portion of the case 10 . The cylinder 100 may be disposed inside the case 10 . Cylinder 100 may have an inner space (V).

The cylinder 100 may include a rolling piston 110 and a vane 120 . The rolling piston 110 may make a pivoting motion with an eccentricity in the inner space (V). The vane 120 may be in contact with the rolling piston 110 to divide the internal space V into a suction chamber V1 and a compression chamber V2.

The driving device 200 may include a rotating shaft 210 and a motor 220 . The rotating shaft 210 may be connected to the rolling piston 210 . The rotating shaft 210 may have a cylindrical shape. The motor 220 may rotate the rotating shaft 210 .

The first flange 300 may be disposed above the cylinder 100 to close the inner space (V). The second flange 400 may be disposed under the cylinder 100 to close the inner space (V). The second flange 400 may be fastened to the cylinder 100 by a second screw F2.

The rotary compressor 1 may include a muffler member 110 disposed above the first flange 300 and guiding the compressed refrigerant from the inner space V to the discharge port 11 . The muffler member 110 may be fastened to the first flange 300 by a first screw F1.

The first flange 300 may include a lobe bearing 310 that is penetrated by the rotation shaft 210 and includes an inner wall 311 having an elliptical cross section.

The second flange 400 may include a lobe bearing 410 that is penetrated by the rotation shaft 210 and includes an inner wall 411 having an elliptical cross section.

The

lobe bearings

310 and 410 are disposed to surround the rotary shaft 210 , and oil O may be disposed between the

lobe bearings

310 and 410 and the rotary shaft 210 .

The rotating shaft 210 may include an oil passage space 211 formed in the longitudinal direction therein and an oil supply hole 212 communicating the outside of the oil passage space 211 and the rotating shaft 210 .

The lower end 213 of the rotating shaft 210 may be disposed adjacent to the lower surface of the case 10 so as to be submerged in the oil O.

Accordingly, the oil O stored in the case 10 moves through the oil passage space 211 and the oil supply hole 212 of the rotation shaft 210, and the rotation shaft 210 and the

lobe bearings

310 and 410 move. can be placed in between.

The cylinder 100 may include a discharge port 130 communicating with the compression chamber V2. The first flange 300 may include a hole 302 communicating with the outlet 130 . The first flange 300 may include a valve member 301 .

The valve member 301 is disposed at the discharge port 130 and may open the discharge port 130 when the pressure inside the compression chamber V2 is equal to or greater than a preset pressure.

The valve member 301 is disposed on the upper surface of the first flange 300 to selectively open and close the hole 302 communicating with the outlet 130 of the cylinder 100 .

The motor 220 is disposed above the first flange 300 and may include a rotor 221 and a stator 222 .

The rotor 221 may be disposed to surround the rotation shaft 210 and rotate together with the rotation shaft 210 . The stator 222 is fixed to the inner surface of the case 10 and enables the rotor 221 to rotate.

4 is a view showing a process in which pressure is transmitted to a lobe bearing. Fig. 5 is a view showing an arrangement structure of lobe bearings. 6 is a view showing the pressure applied to the lobe bearing according to the rotation angle of the rotation shaft. 7 is a cross-sectional view of a lobe bearing according to an embodiment of the present disclosure.

Referring to FIGS. 4 to 7 , the rolling piston 110 may receive pressure from the refrigerant contained in the inner space V of the cylinder 100 partitioned by the vane 120 . That is, the pressure of P1 may be applied to the rolling piston 110 by the refrigerant. Accordingly, periodic pressure is applied to the rotating shaft 210 connected to the rolling piston 110, and the first and

second flange members

300 and 400 penetrated by the rotating shaft 210 are cycled through the oil O. You can receive positive pressure. That is, pressures P2 and P3 may be applied to the

lobe bearings

310 and 410 of the first and

second flange members

300 and 400 by the oil O, respectively.

Referring to the graph of FIG. 6 , periodic pressure may be applied to the

lobe bearings

310 and 410 according to the rotation angle of the rotation shaft 210 . As shown in FIG. 5 , when the rolling piston 210 is closest to the vane slot 121 , the rotation angle of the rotating shaft 210 may be 0 degrees or 360 degrees. The

lobe bearings

310 and 410 may be subjected to a maximum pressure of Pmax when the rotating shaft 210 rotates by Rm degrees. Rm may be an angle greater than 180 degrees and less than 360 degrees. At this time, the rotating shaft 210 may deviate farthest from the central axis of the cylinder 100 .

The

inner walls

311 and 411 of the

lobe bearings

310 and 410 may have long axes disposed along the first axis A1. The

inner walls

311 and 411 of the

lobe bearings

310 and 410 may include two circular arc walls symmetrically disposed with respect to a long axis. The

inner walls

311 and 411 of the

lobe bearings

310 and 410 may have a long axis of the first length L1 and a short axis of the second length L2. The first length L1 may be 1.1 to 2.0 times the second length L2.

The

inner walls

311 and 411 of the

lobe bearings

310 and 410 may be formed by coating a metal material to have an elliptical shape in a cylindrical hole through which the rotating shaft 210 passes, but the forming method is not limited thereto. .

The vane 120 may reciprocate along the second axis A2. The first axis A1 may be rotated by 0 degrees to 90 degrees in the rotation direction R of the rotation shaft 210 based on the second axis A2. For example, the first axis A1 may be rotated by 30 degrees to 60 degrees in the rotation direction R of the rotation shaft 210 based on the second axis A2. That is, S1 may be 0 degrees to 90 degrees or 30 degrees to 60 degrees.

Accordingly, even if the rotation shaft 210 is far away from the central axis of the cylinder 100, the long axes of the

inner walls

311 and 411 of the

lobe bearings

310 and 410 are disposed corresponding to the position of the rotation shaft 210, A sufficient space may still be formed between the rotary shaft 210 and the

inner walls

311 and 411 of the

lobe bearings

310 and 410 .

That is, the minimum oil film thickness of the oil O filled between the rotary shaft 210 and the

inner walls

311 and 411 of the

lobe bearings

310 and 410 may increase. Accordingly, it is possible to prevent unintentional collision of the

inner walls

311 and 411 of the

lobe bearings

310 and 410 by the rotating shaft 210, and the inner wall 311 by the rotating shaft 210 due to a sufficiently thick oil film thickness. , 411) is reduced, the lifespan of the

lobe bearings

310 and 410 is increased, and reliability can be improved.

In addition, since vibration of the rotating shaft 210 is minimized by increasing the minimum oil film thickness of the oil O, the performance of the motor 220 rotatably supporting the rotating shaft 210 may be improved.

In addition, as the minimum oil film thickness of the oil O increases, the frictional loss of the rotary shaft 210 due to the oil O filled between the rotary shaft 210 and the lobe bearings 310 and 320 can be reduced. Accordingly, the overall efficiency and reliability of the rotary compressor 1 can be improved.

In the above, preferred embodiments of the present disclosure have been shown and described, but the present disclosure is not limited to the specific embodiments described above, and in the technical field to which the disclosure belongs without departing from the gist of the present disclosure claimed in the claims. Anyone skilled in the art can make various modifications, of course, and such changes are within the scope of the claims.

Claims

A case in which oil is stored;

a cylinder disposed inside the case, having an inner space, and including a rolling piston that rotates with an eccentricity in the inner space, and a vane that contacts the rolling piston and divides the inner space into a suction chamber and a compression chamber;

a driving device including a rotation shaft connected to the rolling piston and a motor rotating the rotation shaft; and

A first flange and a second flange are respectively disposed on the upper and lower portions of the cylinder to close the inner space; and

The rotary compressor of claim 1 , wherein the first flange and the second flange include lobe bearings having inner walls penetrated by the rotating shaft and having an elliptical cross section.
According to claim 1,

The inner wall of the lobe bearing has a long axis disposed along the first axis,

The vane reciprocates along a second axis,

The first shaft is rotated by 0 to 90 degrees in a rotational direction of the rotation shaft based on the second shaft, and the rotary compressor is disposed.
According to claim 1,

The inner wall of the lobe bearing has a long axis of a first length and a short axis of a second length,

The first length is 1.1 to 2.0 times the second length, the rotary compressor.
According to claim 1,

The inner wall of the lobe bearing includes two circular arc walls symmetrically disposed with respect to a long axis.
According to claim 1,

The axis of rotation is

An oil passage space formed in the longitudinal direction inside and

A rotary compressor comprising an oil supply hole communicating the oil passage space with the outside of the rotating shaft.
According to claim 5,

The lower end of the rotary shaft is disposed adjacent to the lower surface of the case so as to be immersed in oil.
According to claim 1,

The cylinder includes a discharge port communicating with the compression chamber,

The first flange includes a valve member disposed at the discharge port and opening the discharge port when the pressure inside the compression chamber is greater than or equal to a predetermined pressure.
According to claim 1,

The case includes a suction port through which a low-pressure refrigerant flows,

The cylinder includes a suction port communicating with the suction port and the suction chamber and disposed along a third axis,

The third shaft is rotated by 0 degrees to 90 degrees in a rotational direction of the rotation shaft based on the second shaft, and the rotary compressor is disposed.
According to claim 1,

the motor,

Disposed on the upper side of the first flange,

A rotor arranged to surround the rotational shaft and rotating together with the rotational shaft; and

A rotary compressor comprising a stator fixed to an inner surface of the case and rotatably supporting the rotor.
It relates to a home appliance that controls temperature through heat exchange with the outside using a refrigerant.

The home appliance includes a rotary compressor,

The rotary compressor,

A case in which oil is stored;

a cylinder disposed inside the case, having an inner space, and including a rolling piston that rotates with an eccentricity in the inner space, and a vane that contacts the rolling piston and divides the inner space into a suction chamber and a compression chamber;

a driving device including a rotation shaft connected to the rolling piston and a motor rotating the rotation shaft; and

A first flange and a second flange are respectively disposed on the upper and lower portions of the cylinder to close the inner space; and

The home appliance according to claim 1 , wherein the first flange and the second flange include lobe bearings that are penetrated by the rotating shaft and include inner walls having an elliptical cross section.
According to claim 10,

The inner wall of the lobe bearing has a long axis disposed along the first axis,

The vane reciprocates along a second axis,

The first axis is rotated by 0 degrees to 90 degrees in a rotational direction of the rotation axis based on the second axis.
According to claim 10,

The home appliance is one of an air conditioner, a refrigerator and a freezer.