KR20180097391A - Rotary compressor - Google Patents

Abstract

A rotary compressor according to the present invention comprises: a casing having an inlet and an outlet; a drive unit having a stator and a rotor accommodated in the casing to generate rotating force, and a rotary shaft connected to the rotor and rotated; a compression unit having a cylinder positioned to be fixed to the casing, and a rolling piston eccentrically rotating in the cylinder to compress a refrigerant; and an oil separation plate disposed between a discharge port and the drive unit, and positioned to be fixed to the casing. According to the above, in performance of reducing a flow of oil to the discharge port, the performance of power reduction and stability can be achieved.

Description

ROTARY COMPRESSOR

The present invention relates to a compressor, and more particularly to a rotary compressor in which oil circulates inside a compressor and in a refrigeration cycle.

Generally, a compressor can be divided into a rotary type and a reciprocating type according to a method of compressing a refrigerant. The rotary compressor is a method of varying the volume of the compression space while the piston is rotating or revolving in the cylinder, and the reciprocating compressor is a method of varying the volume of the compression space while the piston reciprocates in the cylinder. BACKGROUND ART As a rotary compressor, there is known a rotary compressor which compresses a refrigerant while rotating a piston using a rotary force of a driving portion.

Inside the casing of the rotary compressor, oil flows together with the refrigerant for lubrication and cooling of the components. The oil is sucked together with the refrigerant to perform lubrication and cooling while passing through the rolling portion including the rotating shaft and the rotor together with the refrigerant compressed by the rotation of the rolling piston inside the cylinder.

A part of the oil which has cooled the transmission part together with the refrigerant is recovered to the oil storage space inside the casing, and the other part is discharged from the rotary compressor through the discharge pipe. The discharged oil is circulated through a refrigeration cycle connected to the rotary compressor and then sucked into the rotary compressor.

At this time, as the number of revolutions of the compressor increases, the flow of the refrigerant is strongly formed, and the gentle exchange rate tends to increase. The increase in the sulfur exchange rate leads to a decrease in the oil level inside the rotary compressor, which may cause wear of the sliding portion of the compressor, and may cause a reduction in heat exchange efficiency of the heat exchanger.

In order to reduce the sulfur exchange rate of the oil, a conventional rotary compressor has been provided with a motion type oil separator plate which increases the height of the upper portion of the casing in which the discharge pipe is mounted or rotates by being mounted on the rotary shaft between the transmission portion and the discharge pipe.

However, the conventional countermeasures did not effectively prevent the increase in the sulfur exchange rate during high-speed operation. In particular, the motion type oil separator mounted on the rotary shaft has a problem in that the input of the transmission portion rises and the efficiency is lowered, and there is a problem that cost and time are consumed in designing the connection with the rotary shaft and designing the insulation structure. In addition, there is a possibility that internal components may be damaged as the rotating shaft is rotated at a high speed.

A first object of the present invention is to provide a rotary compressor including an oil separator that is stably positioned inside a casing to separate oil and refrigerant from each other.

A second object of the present invention is to provide a rotary compressor including an oil separator formed to be able to effectively restrict the flow of refrigerant and oil discharged from the rotor side.

A third object of the present invention is to provide a rotary compressor including an oil separator formed so that a flow resistance can be varied along a path through which refrigerant is discharged and oil flows.

A fourth object of the present invention is to provide a rotary compressor including an oil separator which is made so that the oil mixed in the discharged refrigerant can be easily separated by its own weight.

In order to achieve the first object of the present invention, a rotary compressor according to the present invention includes a casing having an inlet and an outlet, a drive unit accommodated in the casing to drive the rotary shaft, a cylinder and a rolling piston, And an oil separator positioned between the discharge port and the drive unit and fixed to the casing.

In order to achieve the second object of the present invention, a rotary compressor according to the present invention includes a discharge port formed in a casing, and an oil separator fixed to the casing so as to block the discharge port and the drive unit. And a penetrating portion extending to surround the closing portion in the radial direction of the rotating shaft and formed to pass the oil in the axial direction of the rotating shaft.

In order to achieve the third object of the present invention, the through-hole formed in the oil separator of the rotary compressor according to the present invention is characterized in that a plurality of through-holes arranged along the radial direction of the rotary shaft extends in the direction Diameter is increased.

In order to achieve the fourth object of the present invention, the oil separator plate of the rotary compressor according to the present invention is formed in a disk shape extending in the radial direction of the rotary shaft and mounted on the inner peripheral surface of the casing, and is formed to be convex toward the discharge port .

According to the present invention constituted by the solution means described above, the following effects can be obtained.

First, the rotary compressor of the present invention is configured such that the oil separator plate provided for reducing the forward exchange rate is fixed to the casing, so that the power input is reduced compared to the case of rotating with the conventional rotary shaft, Can be mitigated. In addition, it is possible to prevent the fastening loosening by high-speed rotation and the damage of the internal components due to the rotation of the oil separator, and the reliability of the rotary compressor can be improved.

In addition, since the oil separator of the present invention is removably attached to the inner circumferential surface of the casing, ease of assembly and utility can be increased.

Secondly, since the oil separator of the present invention includes the closing portion and the penetration portion, the flow rate of the refrigerant and oil discharged by the structural resistance and the path refraction is reduced, so that the oil can be effectively separated and remained.

Thirdly, the through holes of the present invention increase in outer diameter toward the inner circumferential surface side of the casing from the side of the rotating shaft, so that the flow resistance can be gradually reduced while ensuring the oil separating effect. Thereby, a smooth flow of the refrigerant and the oil to be discharged can be formed.

Fourth, since the oil separator of the present invention is formed so as to be convex toward the upper side, the effect of separating the oil from the refrigerant and flowing downward due to its own weight can be further increased.

In addition, the rotary compressor of the present invention may include a rotating oil separating plate mounted on a rotating shaft together with a fixed oil separating plate, and may be designed so as to realize effective oil separating according to the internal structure.

1 is a longitudinal sectional view of a rotary compressor according to an embodiment of the present invention;
Fig. 2 is a plan view showing the oil separator shown in Fig. 1. Fig.
3 is a longitudinal sectional view of the oil separator shown in Fig.
4 is a vertical sectional view of a rotary compressor having an oil separator according to another embodiment of the present invention.
5 is a longitudinal sectional view showing the oil separator shown in Fig.

Hereinafter, a rotary compressor according to the present invention will be described in detail with reference to the drawings.

In other respects, the same or similar reference numerals are given to the same or similar components to those of the previous embodiment, and a duplicate description thereof will be omitted.

It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention, It should be understood that it includes water and alternatives.

1 is a longitudinal sectional view showing a rotary compressor according to an embodiment of the present invention. Referring to FIG. 1, a rotary compressor 100 according to the present invention includes a casing 110, a drive unit 120, and a compression unit 130.

The casing 110 forms the appearance of the rotary compressor 100 of the present invention and serves to mount and support internal components to be described later. The casing 110 may have a cylindrical shape extending long along the extending direction of the rotating shaft 123, which will be described later.

The suction port 111 and the discharge port 112 provided in the casing 110 serve as a passage through which refrigerant and oil flow into and from the casing 110. 1, the suction port 111 may be connected to one side of the casing 110, and the discharge port 112 may be located at an upper portion of the casing 110, as shown in FIG.

The suction port 111 may communicate with the casing 110 from the suction pipe from the evaporator of the refrigeration cycle to which the rotary compressor 100 of the present invention is connected and the discharge port 112 may be connected to the rotary compressor 100 of the present invention And the casing 110 may be connected to the discharge pipe directed to the condenser of the refrigeration cycle.

The drive unit 120 is operated to provide power for compressing the refrigerant. The driving unit 120 includes a stator 121, a rotor 122, and a rotating shaft 123. As shown in FIG. 1, the stator 121 is positioned to be fixed to the casing 110, and may be mounted on the inner circumferential surface of the cylindrical casing 110, for example. The rotor 122 is disposed apart from the stator 121 and disposed inside the stator 121. The stator 121 and the rotor 122 generate a rotational force by a force acting upon each other when electric power is applied to the rotary compressor 100 of the present invention and accordingly the rotational axis 123 connected to the center of the rotor 122, So that power is generated.

Meanwhile, the compression unit 130 serves to compress the refrigerant, and includes a cylinder 131 and a rolling piston 132. The compression unit 130 can be positioned below the drive unit 120. The cylinder 131 is installed between the main bearing 113 and the sub bearing 114 to form a compression space and the rolling piston 132 May be mounted on the rotary shaft 123 so as to rotate in the compression space inside the cylinder 131.

In this embodiment, as shown in FIG. 1, two cylinders 131 and two rolling pistons 132 are mounted vertically to form two compression spaces. The refrigerant sucked through the suction port 111 flows into each compression space and the refrigerant is compressed by the eccentric rotation of the rolling piston 132 inside the cylinder 131. The compressed refrigerant is discharged through the main muffler 115 formed on the upper portion of the main bearing 113. The compressed refrigerant flows through the drive unit 120 described above and is discharged to the discharge port 112. [

On the other hand, in the operation process of the rotary compressor 100 of the present invention, oil is circulated for cooling and lubrication of the drive unit 120. The oil may be filled in the oil storage space of the rotary compressor 100 of the present invention, for example, the bottom surface of the casing 110. The oil stored in the bottom surface of the casing 110 is taken up by the oil feeder 123a formed at the lower part of the rotating shaft 123 and used for lubrication of the internal components including the rotating shaft 123 and the bearing.

The oil passes through the main muffler 115 together with the refrigerant or passes through the oil groove (not shown) between the main bearing 113 and the rotary shaft 123, Lt; / RTI > The oil can perform cooling of the drive unit 120 while passing through the drive unit 120.

The oil can be recovered into the oil-filled space through the drive unit 120 while a part thereof is collided and circulated only within the casing 110 of the rotary compressor 100 of the present invention. However, some of the oil that has not been recovered may be discharged together with the refrigerant through the discharge port 112, and the discharged oil may flow into the refrigerant cycle together with the refrigerant, and then may flow into the suction port 111 and be circulated again.

As described above, when the oil circulation rate (OCR) circulated to the outside of the rotary compressor 100 of the present invention is high, the efficiency of the heat exchanger in the refrigeration cycle, Wear of the elements, and the like, and it is particularly problematic to cope with the increasingly appreciable exchange rate in a high-speed driving environment.

To solve this problem, the rotary compressor (100) of the present invention further includes an oil separator plate (140) having an improved structure. The oil separator 140 is disposed between the discharge port 112 and the drive unit 120 and is positioned to be fixed to the casing 110 in order to restrict oil from flowing out together with the refrigerant to the discharge port 112.

As shown in FIG. 1, the oil separator 140 may be formed to block the inner space of the casing 110 in the radial direction of the rotation shaft 123, and may be formed, for example, in a substantially disk shape. In addition, in order to fix the casing 110, the oil separator 140 may be directly contacted with the inner circumferential surface of the casing 110 in this embodiment. The position at which the oil separator 140 is mounted on the inner circumferential surface of the casing 110 may be a position spaced from the discharge port 112 of the casing 110 by 3 to 50 mm downward.

1, the oil separating plate 140 is formed on the outer circumferential surface of the oil separating plate 140 so as to facilitate contact with the inner circumferential surface of the casing 110, And a flange portion 141 extending in the axial direction of the rotary shaft 123 and contacting the inner circumferential surface of the casing 110. [

The oil separator 140 according to the present invention has a structure in which the oil separator 140 is fixedly positioned with respect to the casing 110 unlike the conventional case where the oil separator 140 is connected to the rotary shaft 123 and is rotated, have. Unlike the oil separating structure mounted on the rotating shaft 123 in the related art, there is a need to consider insulation with the rotating shaft 123, a structure for maintaining the fastening even at high speed rotation with the rotating shaft 123, It is possible to eliminate the design constraint conditions such as damage due to physical contact of the semiconductor device.

In addition, the oil separating plate 140 of the present invention can be configured such that the coupling between the flange portion 141 and the inner circumferential surface of the casing 110 is detachable, thereby facilitating assembly, The applicability of the separator plate 140 can be increased.

Fig. 2 is a plan view showing the oil separator shown in Fig. 1. Fig. Hereinafter, with reference to FIG. 2, a specific structure that the oil separator 140 mounted on the rotary compressor 100 of the present invention can have for oil and refrigerant separation will be described.

The oil separator 140 according to an embodiment of the present invention may further include a closing portion 142 and a penetrating portion 143. The closing portion 142 and the penetrating portion 143 function to flow through the oil separating plate 140 and flow out to the discharge port 112 while the refrigerant and the oil are refracted and flow.

First, the closing portion 142 may be formed to overlap the rotating shaft 123 in the axial direction of the rotating shaft 123. 2, the closing portion 142 may be formed at the center portion of the disc-shaped oil separating plate 140 so as to cover the rotating shaft 123 and also cover at least a part of the rotor 122. As shown in Fig.

In addition, the penetrating portion 143 can be formed around the closing portion 142 in the radial direction of the rotating shaft 123. For example, the penetration portion 143 may be formed so as to occupy a region between two concentric circles with respect to the center of the oil separation plate 140. The penetrating portion 143 may be configured to allow the oil to pass in the axial direction of the rotating shaft 123.

2, the closing portion 142 and the penetrating portion 143 are divided on the basis of a predetermined radius, and the closing portion 142 and the penetrating portion 143 are located at the center of the oil separating plate 140 And can have axially symmetric regions as a reference. The oil separator 140 may be disposed to have the same center as the rotation axis 123 and the rotor 122.

The predetermined radius at which the closing portion 142 ends in the radial direction of the rotating shaft 123 and the penetrating portion 143 starts may be larger than at least the radius of the rotating shaft 123, May be made larger than the radius of the rotor 122 to more effectively constrain the mixed flow of refrigerant and oil flowing toward the rotor 112.

On the other hand, the penetrating portion 143 is formed to penetrate the oil separating plate 140 in the axial direction of the rotating shaft 123 and is disposed along the circumferential direction about the closing portion 142 as shown in Fig. 2 And may include a plurality of through holes 143a. A plurality of through holes 143a may be arranged in the radial direction of the rotating shaft 123 as well.

As described above, the oil separator 140 is formed in a disk shape comprising the closing portion 142 and the penetrating portion 143, thereby forming a flow path in which the refrigerant and the oil can be easily separated from each other.

Specifically, the mixed flow of the refrigerant compressed by the compression unit 130 and the drive unit 120 and the oil flows through the rotor 122 and the rotary shaft 123, which are components that rotate inside the casing 110 It can flow while forming a swirl in the upward direction while being rotated in the circumferential direction of the rotary shaft 123. The oil separator 140 having the closing portion 142 at the center portion is interposed between the discharge port 112 and the drive unit 120 so that the flow of the refrigerant and the oil collides with the closing portion 142, And is formed so as to be bent in the radial direction of the rotating shaft 123 and to pass through the penetrating portion 143.

When the flow of the refrigerant and the oil is restricted and is refracted in the radial direction of the rotary shaft 123, the oil particles having a relatively large mass and radius of curvature collide with the lower end of the closing portion 142 or the inner peripheral surface of the casing 110, The oil can be continuously accumulated and recovered to the bottom surface of the casing 110 by its own weight. Thereby, the amount of oil remaining in the casing 110 can be increased without flowing out to the discharge port 112 and circulating the refrigeration cycle.

Meanwhile, the plurality of through-holes 143a arranged in the radial direction may be gradually increased in diameter along the direction from the rotation axis 123 to the inner circumferential surface of the casing 110. As shown in FIG. 2, when four through-holes 143a are arranged in the radial direction of the rotating shaft 123, the diameter of each of the through-holes 143a becomes smaller toward the closing portion 142, The diameter of each of the through holes 143a may be increased.

Owing to such a change in diameter, the oil and the refrigerant passing through the oil separator 140 at the central portion of the drive unit 120, that is, the rotating shaft 123 and the rotor 122, have relatively large flow resistance, The flow resistance gradually decreases as the oil and the refrigerant pass near the inner circumferential surface side of the oil passage 110, so that the oil flow can flow relatively smoothly. Accordingly, it is possible to smoothly discharge the refrigerant to the discharge port 112 while ensuring the effect of separating the oil from the refrigerant.

3 is a longitudinal sectional view of the oil separator shown in Fig. Hereinafter, a description will be given of a structure in which the oil separator 140 according to an embodiment of the present invention can be effectively separated from the oil when viewed from the front or side as in FIG.

The oil separator plate 140 of the rotary compressor 100 according to an embodiment of the present invention may be formed in a circular plate shape convex toward the discharge port 112. [ 3, the side on which the closing portion 142, which is the center portion of the oil separator 140, is formed so as to be convex toward the image side, and the penetrating portion 143 surrounding the circumference of the oil separator 140 has a predetermined angle (Or the flange 141) of the casing 110 so as to be inclined downward. The angle formed by the penetrating portion 143 with respect to the radial direction of the rotating shaft 123 may be set in consideration of the flow resistance of the refrigerant and the oil, the oil separating effect, or the size of the space in which the oil separating plate 140 is to be disposed .

Owing to such a structure, the oil flow passing through the drive unit 120 becomes larger in the refraction of the flow path in the oil separator plate 140 and the larger flow resistance, so that a larger amount of oil flows into the oil separator plate 140. [ Lt; / RTI > Particularly, the oil particles stuck to the bottom surface of the oil separator 140 flow along the bottom surface of the oil separator 140 inclined by their own weight, There is an effect that can be promoted.

FIG. 4 is a longitudinal sectional view showing a rotary compressor having an oil separator according to another embodiment of the present invention, and FIG. 5 is a longitudinal sectional view showing the oil separator shown in FIG. In another embodiment of the present invention, the shape of the oil separation plate 240 viewed from the front and side surfaces may be formed such that the closing portion 242 and the penetration portion 243 are convex in different directions.

4 and 5, the closing portion 242 may be formed in a disc shape convex toward the rotating shaft 123, while the through portion 243 connected to the outer peripheral surface of the closing portion 242 May be extended toward the inner circumferential surface of the casing 110 so as to be inclined toward the lower side as in the previous embodiment. That is, the penetrating portion 243 may be located closer to the driving unit 120 than the inner circumferential surface side where the outer circumferential surface side connected to the flange portion 241 is connected to the closing portion 242. The angle formed by the closing portion 242 and the penetrating portion 243 with the radial direction of the rotating shaft 123 may be designed to be constant or vary along the radial direction.

The oil separation plate 240 according to another embodiment of the present invention can increase the effect that the oil can be accumulated and recovered due to its own weight in the same manner as the oil separation plate 140 of the embodiment which is formed in an upward convex shape .

In addition, in the case where the closing portion 242 is convex upward as in the embodiment of the present invention, the refrigerant and the oil flowing from the driving unit 120 toward the bottom of the closing portion 242, There is an effect that the possibility that the refrigerant and the oil are stagnated due to the convex structure of the portion 142 can be eliminated.

The oil separating plates 140 and 240 may be applied to a rotating oil separating plate (not shown) mounted on the rotating shaft 123 according to an embodiment of the present invention. That is, the rotary compressor 100 of the present invention is disposed between the oil separating plates 140 and 240 and the drive unit 120, and is disposed on the rotary shaft 123 so that the refrigerant and oil flow in the radial direction of the rotary shaft 123 And a rotating oil separator plate mounted and rotated. By adding the rotary oil separator, the effect of pushing the refrigerant and oil flowing through the drive unit 120 in the radial direction of the rotary shaft 123 can be further maximized. At this time, since the present invention is equipped with the oil separating plate 140 which is fixedly positioned, the rotating oil separating plate can be advantageously reduced in size and weight compared with the conventional one.

It is to be understood that the present invention is not limited to the above-described embodiments, but may be modified and changed without departing from the spirit and scope of the present invention as claimed in the following claims. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: rotary compressor 110: casing
111: inlet 112: outlet
113: main bearing 114: sub bearing
115: main muffler 120: drive unit
121: stator 122: rotor
123: rotation shaft 130: compression unit
131: cylinder 132: rolling piston
140, 240: oil separation plate 141, 241: flange portion
142, 242: closing portion 143, 243:
143a, 243a: Through hole

Claims (8)

A casing having a suction port and a discharge port;
A stator and a rotor accommodated in the casing to generate a rotating force; a driving unit having a rotating shaft connected to the rotor and rotated;
A compression unit coupled to the rotary shaft and having a rolling piston eccentrically rotating in the cylinder to compress the refrigerant; And
And an oil separator disposed between the discharge port and the drive unit and positioned to be fixed to the casing so as to restrict oil from flowing out to the discharge port. The method according to claim 1,
Wherein the oil separator includes a flange portion which is detachable from the inner circumferential surface of the casing and extends along the inner circumferential surface of the casing. The method according to claim 1,
Wherein the oil separator comprises:
A closure part formed to overlap the rotation axis in an axial direction of the rotation shaft; And
And a penetrating portion formed to surround the closing portion in the radial direction of the rotating shaft and configured to pass the oil in the axial direction of the rotating shaft. The method of claim 3,
Wherein the through-hole includes a plurality of through-holes that are formed to penetrate the oil separator in the axial direction and are disposed along the circumferential direction about the closed portion. The method of claim 3,
Wherein the penetrating portion includes a plurality of through holes formed to penetrate the oil separator in the axial direction and disposed along the radial direction,
Wherein the plurality of through holes are formed to increase in diameter along a direction from the rotation shaft toward the casing. The method according to claim 1,
Wherein the oil separator is formed in a disk shape extending in a radial direction of the rotary shaft and mounted on an inner peripheral surface of the casing, and is formed to be convex toward the discharge port. The method of claim 3,
Wherein the closing portion is formed in a disk shape that is convex toward the rotation axis,
And the other end connected to the inner circumferential surface of the casing is positioned lower than the one end connected to the closing portion by a reference, the penetrating portion being connected to the closing portion and the inner circumferential surface of the casing, . The method according to claim 1,
And a rotary oil separator disposed between the oil separator and the drive unit and mounted on the rotary shaft so that the oil flows in a radial direction of the rotary shaft.

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