KR101484538B1 - Scoroll compressor and refrigsrator having the same - Google Patents

Abstract

The present invention relates to a scroll compressor and a refrigeration apparatus using the same. According to the present invention, the oil in the back pressure chamber flows smoothly into both compression chambers by forming the oil supply passage communicating with the back pressure chamber and the compression chamber in the fixed scroll, so that the friction loss and the refrigerant leakage in the compression chamber can be effectively blocked, And the efficiency of the refrigeration apparatus using the same can be increased.

Scroll compressor, back pressure,

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a scroll compressor,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a scroll compressor for allowing oil to flow smoothly into both compression chambers, and a refrigeration apparatus using the same.

Generally, a scroll compressor is a compressor that compresses a refrigerant gas by changing a volume of a compression chamber formed by a pair of opposing scrolls. The scroll compressor is more efficient than a reciprocating compressor or a rotary compressor, has low vibration and noise, can be made compact and lightweight, and is widely used particularly in air conditioners.

The scroll compressor may be divided into a low-pressure type and a high-pressure type according to the type of refrigerant supplied to the compression chamber. That is, in the low-pressure scroll compressor, the refrigerant is indirectly sucked into the compression chamber through the inner space of the casing, and the inner space of the casing is divided into the suction space and the discharge space. On the other hand, in the high-pressure scroll compressor, the refrigerant is directly supplied to the compression chamber without passing through the inner space of the casing, and is discharged to the inner space of the casing, so that the entire inner space of the casing is formed as the discharge space.

Also, the scroll compressor can be divided into a low pressure type and a high pressure type by sealing the compression chamber. That is, since the internal space of the casing forms a suction space, the compression chamber is provided with a tip chamber at the end of the lap forming the compression chamber so as to float the tip chamber with the pressure of the compression chamber, Thereby sealing the compression chamber. On the other hand, the high-pressure scroll compressor supports the rear surface of the orbiting scroll with the high-pressure refrigerant filled in the discharge space as the inner space of the casing forms the discharge space, thereby making the orbiting scroll closely contact with the fixed scroll, As shown in Fig.

To this end, in the high pressure type scroll compressor, a back pressure groove is formed in the frame on which the orbiting scroll is placed, and the back side and the inner side of the back pressure groove are covered with the fixed scroll and the orbiting scroll, respectively, And the oil filled in the low oil part of the casing is supplied to support the orbiting scroll.

However, in the conventional high-pressure scroll compressor as described above, when the oil is not smoothly supplied to the back pressure chamber, the orbiting scroll is separated from the fixed scroll, and the refrigerant in the compression chamber leaks, thereby reducing the efficiency of the compressor. Particularly, when the low-speed operation is performed, the oil supply amount to the back pressure chamber is lowered when the low-temperature oil of the casing can not be smoothly taken up. As a result, the oil in the back pressure chamber can not stably support the orbiting scroll, The efficiency of the compressor is greatly reduced.

On the other hand, during high-speed operation, a large amount of oil is supplied to the back pressure chamber, and as the orbiting scroll is excessively pushed up, the bearing surface between the fixed scroll and the orbiting scroll is brought into close contact with each other and oil can not be supplied to the compression chamber. There is a problem that the friction loss is increased due to the lack of oil in the compression chamber, and the refrigerant leakage occurs at both side wall surfaces of the lap, thereby reducing the efficiency of the compressor.

The present invention solves the problems of the conventional high-pressure scroll compressor as described above, and it is possible to keep the pressure of the back pressure chamber constant, thereby preventing the axial leakage between the both scrolls, and at the same time, To provide a scroll compressor which blocks friction loss and radial leakage between both scrolls, and a refrigerating machine having the scroll compressor.

In order to achieve the object of the present invention, A frame fixedly installed on the casing; A fixed scroll fixed to the frame and having a spiral wrap formed on one side thereof; A orbiting scroll provided between the frame and the fixed scroll and having a helical wrap to form a pair of compression chambers continuously moving while pivotally moving in engagement with the wraps of the fixed scroll; Wherein a back pressure chamber is formed in the rear surface of the orbiting scroll so that the fixed scroll and the orbiting scroll are sealed in the axial direction by the orbiting scroll, the fixed scroll and the frame, and the compression chamber and the back pressure chamber are communicated with each other There is provided a scroll compressor in which an oil supply passage is formed.

In addition, A condenser connected to a discharge side of the compressor; An expander connected to the condenser; And an evaporator connected to the inflator and connected to a suction side of the compressor, wherein the compressor includes a compressor in which an oil supply passage is formed so that the compression chamber and the back pressure chamber are communicated with the fixed scroll.

The scroll compressor according to the present invention not only reduces the friction loss in the compression chamber as the oil in the back pressure chamber is alternately supplied to both compression chambers but also prevents the refrigerant from leaking in the radial direction to increase the efficiency of the compressor . In addition, a part of the refrigerant compressed in the compression chamber is supplied to the back pressure chamber so that the pressure of the back pressure chamber is kept constant, whereby the orbiting scroll is stably supported to effectively prevent axial leakage in the compression chamber, The efficiency can be improved.

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

1, a high-pressure scroll compressor according to the present invention includes a casing 10 having a closed internal space, a main frame 20 fixed to both upper and lower internal spaces of the casing 10, A driving motor 30 mounted between the main frame 20 and a subframe (not shown) to generate a rotational force; a driving motor 30 fixedly mounted on the upper surface of the main frame 20, A fixed scroll 40 directly coupled to the fixed scroll 40 and an orbiting scroll 50 pivotally mounted on the upper surface of the main frame 20 to form a compression chamber P, An Oldham's ring (not shown) provided between the orbiting scroll 50 and the main frame 20 to prevent rotation of the orbiting scroll 50 and an orbiting scroll 50, And a sealing member (not shown) provided between the main frame 20 and the oil passage 60).

The closed space of the casing 10 is partitioned into an upper space S1 and a lower space S2 by the main frame 20 and the fixed scroll 40 so that the upper space S1 and the lower space S2 S2 are kept at a high pressure, and the bottom surface of the lower space S2 of the casing 10 is filled with oil. The gas suction pipe SP is coupled to the upper space S1 of the casing 10 and the gas discharge pipe DP is coupled to the lower space S2 of the casing 10. [

The main frame 20 is formed with a shaft hole 21 at the center thereof and an oil pocket 22 is formed at an upper end of the shaft hole 21 so as to collect oil picked up via a drive shaft 32 do. A back pressure groove (23) is formed in the upper surface of the main frame (20) so as to form a back pressure chamber (S3) having a part of the refrigerant sucked and a part of the oil absorbed thereinto and having an intermediate pressure. A sealing groove (not shown) is formed in an annular shape to seal the oil contained in the oil pocket 22 to maintain a high pressure. The back pressure chamber S3 is formed by combining the back pressure groove 23 of the main frame 20 with the longitudinal plate portion 41 of the fixed scroll 40 to be described later and the longitudinal plate portion 51 of the orbiting scroll 50 to be described later, .

The driving motor 30 includes a stator 31 fixed to the inside of the casing 10 to receive power from the outside and a stator 31 disposed inside the stator 31 with a predetermined gap therebetween, And a drive shaft 32 coupled to the rotor by a hot sound to transmit the rotational force of the drive motor 30 to the orbiting scroll 50. [ The drive shaft 32 is formed with an oil passage 32a in an axial direction and an oil pump (not shown) is installed at a lower end of the oil passage 32a.

The stationary scroll 40 is formed in a spiral shape with a fixed lap 42 forming a pair of two compression chambers P on the bottom surface of the rigid plate 41. On the side surface of the rigid plate 41, A discharge port 44 for discharging the compressed refrigerant into the upper space S1 of the casing 10 is formed at the center of the upper surface of the hard plate part 41, The compression chamber P and the back pressure chamber S3 are formed between the rap and the rap constituting the compression chamber P on the bottom surface of the hard plate portion 41, that is, the surface constituting the thrust bearing surface together with the orbiting scroll 50, The supply passage 110 is formed.

2 to 4, the oil supply passage 110 includes a first passage hole 111 communicating with the back pressure chamber S3 and a second passage hole 112 communicating with the compression chamber P, And a first communication groove 113 formed at a predetermined depth in the axial direction on the upper surface of the fixed scroll 40 so that the first passage hole 111 and the second passage hole 112 are communicated with each other .

The first passage hole 111, the second passage hole 112, and the first communication groove 113 are formed so as to form one flow passage, and the one flow passage is alternately arranged with the pair of compression chambers P Respectively. That is, one of the second passage holes 112 is formed, and the second passage hole 112 is formed to be positioned at the center between the adjacent fixed lugs 42, It is preferable that the inner diameter d of the second passage hole 112 is formed not to be larger than the wrap thickness t of the orbiting scroll so that the refrigerant does not leak into the outer compression chamber.

The first passage hole 111 and the second passage hole 112 may be formed to have the same diameter so that the diameter of the first communication groove 113 is not too wide, 2 to 4, the upper end communicating with the first communication groove 113 may be inclined toward the second passage hole 111, as shown in FIGS. 2 to 4, It is possible to prevent the diameter of the communication groove 113 from being widened, thereby facilitating the processing and also allowing the oil to be wiped more smoothly.

The first communication groove 113 is formed at a predetermined depth to be connected to the first passage hole 111 and the second passage hole 112 on the upper surface of the fixed scroll 40, Sectional area of at least the first passage hole 111 and the second passage hole 112 so that the first passage hole 111 and the second passage hole 112 can communicate with each other.

A blocking member 120 is inserted into the first communication groove 113 at a predetermined depth from the upper end of the first communication groove 113 to separate the first communication groove 113 from the internal space of the casing 10. 2 and 3, the blocking member 120 may be press-fitted and sealed by a relatively non-ferrous metal, or may be fastened to a predetermined depth using a metal bolt having a thread as shown in FIG. In the case of using a metal bolt, it is preferable that the sealing bolt 121 is sealed to the head of the metal bolt.

A second communication groove 114 may be formed at an end of the first passage hole 111 so as to communicate with the back pressure chamber S3.

5, the second communication groove 114 may be formed to be long in the radial direction on the bearing surface of the fixed scroll 40 forming the bearing surface with the orbiting scroll 50. However, Or may be formed in a circular shape wider than the diameter of the passage hole 112.

2, the orbiting scroll 50 is provided with a fixed lap 42 of the fixed scroll 40 on the upper surface of the fixed plate 51, and a swinging lap 42 constituting a pair of compression chambers P And a boss portion 53 coupled to the drive shaft 32 and receiving the power of the drive motor 30 is formed at the center of the bottom surface of the hard plate portion 51.

The fixed lap 42 and the orbiting lap 52 may be formed symmetrically with each other with the lap length being equal to each other, and the lap length may be different, that is, the orbiting wrap may be formed in an asymmetric shape It is possible.

The operation and effect of the scroll compressor of the present invention are as follows.

That is, when power is applied to the driving motor 30, the driving shaft 32 rotates together with the rotor to transmit the rotational force to the orbiting scroll 50, and the orbiting scroll 50, Between the stationary wrap (42) of the fixed scroll (40) and the orbiting wrap (52) of the orbiting scroll (50) while rotating by eccentric distance from the upper surface of the main frame A pair of compression chambers P continuously moving are formed. The compression chamber (P) is moved to the center by the continuous swirling motion of the orbiting scroll (50), and the volume thereof is reduced to compress the refrigerant sucked.

At the same time, the oil filled in the casing 10 is pumped by the oil pump (not shown) provided at the lower end of the drive shaft 32, While a part of the oil is scattered at the upper end of the drive shaft 32 and flows into the back pressure chamber S3 of the main frame 20 . The oil introduced into the back pressure chamber S3 supports the orbiting scroll 50 and raises the orbiting scroll 50 toward the fixed scroll 40, So that the compression chamber P is sealed while being in close contact with the respective hard plate portions 51 and 41 corresponding thereto.

In this state, the orbiting scroll (50) continuously compresses the refrigerant while swirling, and a part of the refrigerant to be compressed moves to the back pressure chamber (S3) through the oil supply passageway (110) The pressure of the chamber S3 is kept constant. 6, one of the outlets of the oil supply passageway 110, that is, the second passage holes 112, is formed, but the second passage holes 112 are formed on both sides of the orbiting wrap 52 The oil can be uniformly supplied to the respective compression chambers P through the oil supply passageway 110 as they are alternately communicated with the compression chambers P.

The scroll wrap 50 of the orbiting scroll 50 and the stationary scroll 40 of the fixed scroll 40 are tightly brought into close contact with the opposing scrolls 41 and 51, Can be effectively prevented from leaking in the axial direction, i.e., the height direction of the lap. The refrigerant in the compression chamber P is discharged to the back pressure chamber S3 even if the pressure rise in the back pressure chamber S3 is delayed because the compressor does not smoothly pick up the oil from the low- The orbiting scroll 50 can be quickly raised and the efficiency of the compressor can be increased.

In addition, while the orbiting scroll 50 continuously swings, the oil flows into the compression chamber P from the back pressure chamber S3 to reduce the friction loss in the compression chamber P, I.e., in the radial direction, thereby increasing the efficiency of the compressor. In particular, when the compressor operates at a low speed, the oil is not sufficiently filled in the back pressure chamber S3 or the pressure of the back pressure chamber S3 is not sufficiently raised, so that the oil is prevented from flowing into the fixed scroll 40 and the orbiting scroll 50, Even if oil is not sucked smoothly into the compression chambers P through the bearing surface between the compression chambers P, the oil is directly supplied to the compression chambers P through the oil supply passage 110, So that the performance of the compressor can be improved. When the compressor operates at a high speed, oil is excessively introduced into the back pressure chamber (S3) and the fixed scroll (40) and the orbiting scroll (50) come in close contact with each other, The oil is supplied to the compression chamber P through the oil supply passage 110 even though the oil does not flow into the scroll 50. Accordingly, .

On the other hand, when the scroll compressor according to the present invention is applied to a refrigerating machine, the efficiency of the refrigerating machine can be improved.

For example, as shown in FIG. 7, in a refrigeration apparatus 700 having a refrigerant compression refrigeration cycle including a compressor, a condenser, an expander, and an evaporator, a main substrate 710 The scroll compressor C is connected to the scroll compressor C and the oil supply passage is formed in the fixed scroll installed inside the scroll compressor C so that the compression chamber and the back pressure chamber communicate with each other as in the above embodiment.

In this way, frictional losses and refrigerant leakage in the compressor can be effectively blocked, thereby increasing the efficiency of the compressor, thereby improving the energy efficiency of the refrigerating machine to which the compressor is applied. Further, the lubrication passage of the compressor can be easily processed, so that the productivity of the compressor and the refrigerating appliance using the compressor can be improved.

The scroll compressor according to the present invention can be widely used in refrigeration machines such as air conditioners.

1 is a longitudinal sectional view showing a part of a scroll compressor according to the present invention,

FIG. 2 is a perspective view showing a compressed portion of the scroll compressor according to FIG. 1,

FIG. 3 is a perspective view enlarging the oil supply passage in the scroll compressor according to FIG. 2,

FIG. 4 is a vertical sectional view showing another embodiment of the oil supply passage in the scroll compressor according to FIG. 1;

FIG. 5 is a bottom view showing a second communication groove in the scroll compressor according to FIG. 1;

Fig. 6 is a longitudinal sectional view showing that the oil supply passage is in communication with the back pressure chamber in the orbiting scroll of the scroll compressor according to Fig. 1; Fig.

FIG. 7 is a schematic view showing an embodiment of an air conditioner to which the scroll compressor according to FIG. 1 is applied. FIG.

DESCRIPTION OF REFERENCE NUMERALS

20: main frame 23: back pressure groove

40: fixed scroll 41: fixed scroll hard plate part

42: stationary lap 50: orbiting scroll

51: orbiting scroll plate portion 110: oil supply passage

111, 112: passage holes 113, 114: communicating groove

115: sealing groove 120: blocking member

Claims (13)

A casing having a closed inner space; A frame fixedly installed on the casing; A fixed scroll fixed to the frame and having a spiral wrap formed on one side thereof; A orbiting scroll provided between the frame and the fixed scroll and having a helical wrap to form a pair of compression chambers continuously moving while pivotally moving in engagement with the wraps of the fixed scroll; Including, A back pressure chamber is formed on the back surface of the orbiting scroll to seal the fixed scroll and the orbiting scroll in the axial direction by the orbiting scroll, the fixed scroll, and the frame, Wherein the fixed scroll is formed with an oil supply passage through which the compression chamber and the back pressure chamber communicate with each other, A first passage hole communicated with the back pressure chamber, a second passage hole communicated with the compression chamber, and a second passage hole communicating with the first passage hole and the second passage hole at a predetermined depth in the axial direction on the upper surface of the fixed scroll A first communication groove formed on the bearing surface of the stationary scroll and forming a bearing surface, the first communication groove being separated from the inner space of the casing by a separate blocking member, and having a cross sectional area larger than the cross sectional area of the first passage hole And a second communication groove for allowing the first passage hole and the back pressure chamber to communicate widely. The method according to claim 1, Wherein the oil supply passage is formed so that one end of the oil supply passage alternately communicates with the pair of compression chambers. 3. The method of claim 2, Wherein the oil supply passage is formed so that its inner diameter is not larger than the wrap thickness of the orbiting scroll. delete The method according to claim 1, Wherein the first passage hole is formed such that an end communicating with the first communication groove is inclined toward the second passage hole. The method according to claim 1, Wherein the first passage hole and the second passage hole are formed in the same cross-sectional area. The method according to claim 1, And the second passage holes are formed as one and communicated with the pair of compression chambers alternately. delete delete delete The method according to claim 1, And the second communication groove is formed to be long in the radial direction. delete compressor; A condenser connected to a discharge side of the compressor; An expander connected to the condenser; And And an evaporator connected to the inflator and connected to the suction side of the compressor, Wherein the compressor comprises the compressor according to any one of claims 1 to 3, 5 to 7, and 11.

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