KR20100042168A - Scoroll compressor and refrigsrator having the same - Google Patents

Abstract

PURPOSE: A scroll compressor in which oil smoothly flows in both pressure chambers and a refrigerator with the same are provided to reduce the friction loss of a compression room by alternately supplying oil of a back pressure chamber to both pressure chambers. CONSTITUTION: A scroll compressor comprises a casing, a frame, a fixed scroll, and a rolling scroll. The casing comprises a sealed interior. The frame is installed in the casing. The fixed scroll is fixed to the frame. The wrap of helix is formed on one side of the fixed scroll. The rolling scroll comprises the wrap of helix and is installed between the frame and fixed scroll. A back pressure chamber is formed in the rear side of the rolling scroll. An oil supply channel(110) which connects a compression room and the back pressure chamber is formed on the fixed scroll.

Description

SCROLL COMPRESSOR AND REFRIGSRATOR HAVING THE SAME}

The present invention relates to a scroll compressor for allowing oil to smoothly flow into both compression chambers and a refrigerating device to which the oil is applied.

Generally, a scroll compressor is a compressor which compresses refrigerant gas by changing the volume of the compression chamber formed by a pair of opposing scrolls. Scroll compressors are more efficient than reciprocating compressors or rotary compressors, have low vibration and noise, are compact and lightweight, and thus are widely used in air conditioners.

The scroll compressor may be classified 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 then discharged into the inner space of the casing, and the entire inner space of the casing is a discharge space.

In addition, the scroll compressor may be classified into a low pressure type and a high pressure type by a method of sealing a compression chamber. That is, in the low pressure scroll compressor, as the inner space of the casing forms the suction space, the compression chamber is provided with a tip chamber at the end of the wrap forming the compression chamber, so that the tip chamber is injured by the pressure of the compression chamber and the tip is injured. It is configured to seal the compression chamber with a thread. On the other hand, in the high pressure scroll compressor, as the inner space of the casing forms a discharge space, the back scroll of the swing scroll is supported by a high pressure refrigerant and oil filled in the discharge space so that the swing scroll is in close contact with the fixed scroll. It is configured to seal.

To this end, in the high-pressure scroll compressor, the back pressure groove is formed in the frame on which the swing scroll is mounted, and the upper side and the inner circumferential side of the back pressure groove are covered with the fixed scroll and the swing scroll to form a back pressure chamber, and the back pressure chamber. The oil filled in the oil storage part of the casing is supplied to support the turning 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 rotating scroll is spaced apart from the fixed scroll, and the refrigerant in the compression chamber leaks, thereby lowering the efficiency of the compressor. In particular, during low-speed operation, the oil supply amount to the back pressure chamber is reduced while the oil in the casing is not sucked up smoothly, and thus the oil leakage in the back pressure chamber does not stably support the swing scroll, and thus the refrigerant leaks in the compression chamber. The weighting has a problem that the compressor efficiency is greatly reduced.

On the other hand, in the high speed operation, as a large amount of oil is supplied to the back pressure chamber to excessively push up the swinging scroll, the bearing surface between the fixed scroll and the swinging scroll is in close contact and oil is not supplied to the compression chamber. In the compression chamber, not only the friction loss is increased due to the lack of oil, but also refrigerant leakage occurs at both side wall surfaces of the wrap, resulting in a decrease in compressor efficiency.

The present invention solves the problems of the conventional high pressure scroll compressor as described above, it is possible to maintain a constant pressure in the back pressure chamber to block the axial leakage between both scrolls and at the same time oil smoothly and uniformly into the compression chamber SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll compressor and a refrigerating device having the same, which can be supplied so as to block friction loss and radial leakage between both scrolls.

Casing having a closed inner space to achieve the object of the present invention; A frame fixed to the casing; A fixed scroll fixed to the frame and having a spiral wrap formed on one side thereof; A swing scroll provided between the frame and the fixed scroll, wherein a spiral wrap is formed to form a pair of compression chambers that continuously move while engaging the wrap of the fixed scroll and pivoting; And a back pressure chamber is formed on a rear surface of the swing scroll so that the fixed scroll and the swing scroll are axially sealed by the swing scroll and the fixed scroll, and the fixed scroll communicates with the compression chamber and the back pressure chamber. A scroll compressor is provided in which an oil supply passage is formed.

In addition, a compressor; A condenser connected to the discharge side of the compressor; An expander coupled to the condenser; And an evaporator connected to the inflator and connected to the suction side of the compressor, wherein the compressor is provided with a compressor having an oil supply passage so that the compression chamber and the back pressure chamber communicate with the fixed scroll.

In the scroll compressor according to the present invention, as the oil of the back pressure chamber is alternately supplied to both compression chambers, the scroll compressor may not only reduce friction loss in the compression chamber but also prevent the refrigerant from being compressed from leaking in a radial direction, thereby increasing the efficiency of the compressor. Can be. In addition, a portion of the refrigerant compressed in the compression chamber is supplied to the back pressure chamber to maintain a constant pressure in the back pressure chamber, thereby stably supporting the swing scroll, thereby effectively preventing axial leakage in the compression chamber. The efficiency can be improved.

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

As shown in FIG. 1, the high-pressure scroll compressor according to the present invention includes a casing 10 having a sealed inner space, a main frame 20 and a sub which are respectively fixed to upper and lower inner spaces of the casing 10. A frame (not shown), a drive motor 30 mounted between the main frame 20 and a subframe (not shown) and generating rotational force, and fixedly installed on an upper surface of the main frame 20 and the gas suction pipe. A fixed scroll 40 to which the SP is directly coupled, and a pivoting scroll 50 rotatably mounted on an upper surface of the main frame 20 to form a compression chamber P by engaging the fixed scroll 40. Is installed between the turning scroll 50 and the main frame 20 to prevent the rotation of the turning scroll 50 to rotate the Oldham's ring (not shown) and the turning scroll 50 And a sealing member provided between the mainframe 20 to block the flow of oil ( 60).

The casing 10 has a sealed inner space divided into an upper space S1 and a lower space S2 by the main frame 20 and the fixed scroll 40, and the upper space S1 and the lower space ( S2) maintains a high pressure state, and the bottom surface of the casing 10 (S2) 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 connected to the lower space S2 of the casing 10.

The main frame 20 has a bearing hole 21 formed in the center thereof, and an oil pocket 22 is formed at the upper end of the bearing hole 21 so that oil drawn up through the drive shaft 32 to be described later is collected. do. In addition, a back pressure groove 23 is formed at an upper edge of the main frame 20 to form a back pressure chamber S3 having a medium pressure by mixing a part of the refrigerant sucked with a part of the oil sucked up, and the back pressure groove 23. Inside the seal member 60 is inserted into a sealing groove (unsigned) is formed in an annular shape to seal the oil accumulated in the oil pocket 22 to maintain a high pressure. The back pressure chamber S3 is a space in which the back pressure groove 23 of the main frame 20 and the hard plate portion 41 of the fixed scroll 40 to be described later and the hard plate portion 51 of the turning scroll 50 to be described later are combined. To form.

The drive motor 30 is fixed to the inside of the casing 10 and the power is applied from the outside and the stator 31 is disposed with a predetermined gap inside the stator 31 is mutually Rotor (not shown) that rotates while acting, and the drive shaft 32 is coupled to the rotor in a shrinking manner to transmit the rotational force of the drive motor 30 to the swing scroll (50). The drive shaft 32 has an oil passage 32a formed therethrough in the axial direction, and an oil pump (not shown) is installed at a lower end of the oil passage 32a.

The fixed scroll 40 is formed on the bottom surface of the hard plate portion 41, the fixed wrap 42 constituting a pair of two compression chamber (P) in a spiral form, the side of the hard plate portion 41 is the gas suction pipe A suction port 43 in which SP is directly communicated is formed, and 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) between the wrap and the wrap forming the compression chamber (P) on the bottom surface of the hard plate portion 41, that is, the surface forming the thrust bearing surface with the turning scroll (50) An oil supply passageway 110 is formed to communicate with each other.

As shown in FIGS. 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 an upper surface of the fixed scroll 40 so that the first passage hole 111 and the second passage hole 112 communicate with each other. .

The first passage hole 111, the second passage hole 112, and the first communication groove 113 are formed to form a single flow path, and the one flow path alternates with the pair of compression chambers P. It is formed to communicate. That is, one second passage hole 112 is formed, and the second passage hole 112 is formed to be positioned at the center between neighboring fixing wraps 42 and in the inner compression chamber according to the pressure difference. Preferably, the inner diameter d of the second passage hole 112 is not greater than the wrap thickness t of the turning 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, the first passage hole 111 is Although it may be formed parallel to the second passage hole 112, as shown in FIGS. 2 to 4, the upper end communicating with the first communication groove 113 is formed to be inclined toward the second passage hole 111. The diameter of the communication groove 113 can be prevented from being widened to facilitate the processing, and the oil can be sucked up more smoothly.

The first communication groove 113 is formed on the upper surface of the fixed scroll 40 to be grooved to a predetermined depth to a portion where the first passage hole 111 and the second passage hole 112 are connected to each other. The first passage hole 111 and the second passage hole 112 are formed larger than the entire cross-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.

The blocking member 120 is coupled to the first communication groove 113 so that the first communication groove 113 is separated from the inner space of the casing 10 by a predetermined depth inserted at an upper end thereof. The blocking member 120 may be press-fitted into a non-ferrous metal having relatively elasticity as shown in FIGS. 2 and 3 to be hermetically coupled or fastened to a predetermined depth using a metal bolt provided with a thread as shown in FIG. 4. In the case where the metal bolt is used, it may be preferable to seal the head of the metal bolt by sealing sealing 121.

On the other hand, the second communication groove 114 may be further formed at the end of the first passage hole 111 so as to be in wide communication with the back pressure chamber (S3).

The second communication groove 114 may be formed in the bearing surface of the fixed scroll 40 forming the bearing surface and the rotating scroll 50, as shown in Figure 5 in the radial direction, but in some cases the second It may be formed in a circular shape wider than the diameter of the passage hole (112).

As shown in FIG. 2, the turning scroll 50 forms a pair of compression chambers P together with the fixing wrap 42 of the fixed scroll 40 on the upper surface of the hard plate portion 51 ( 52 is formed in a spiral shape, and a boss portion 53 is coupled to the driving shaft 32 at the center of the bottom surface of the hard plate portion 51 to receive the power of the driving motor 30.

Here, the fixed wrap 42 and the swing wrap 52 may be formed symmetrically with the same wrap length, the wrap length is different, that is, the swing wrap is formed in an asymmetric shape about 180 ° long It may be.

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

That is, when power is applied to the drive motor 30, the drive shaft 32 rotates with the rotor to transmit a rotational force to the turning scroll 50, the rotational scroll 50 received this rotational force Is rotated by an eccentric distance from the upper surface of the main frame 20 by the Oldham ring 60 between the fixed wrap 42 of the fixed scroll 40 and the turning wrap 52 of the orbiting scroll 50. A pair of compression chambers P continuously moving are formed in the. In addition, the compression chamber P moves to the center by the continuous swing motion of the swing scroll 50 to compress the refrigerant sucked by the volume decrease.

At the same time, in the oil pump (not shown) installed at the lower end of the drive shaft 32 to pump the oil filled in the casing 10, the oil is the upper end through the oil passage 32a of the drive shaft 32 While some of the oil is supplied to the bearing hole 21 of the main frame 20, some of the oil is scattered from the upper end of the driving shaft 32 and flows into the back pressure chamber S3 of the main frame 20. . The oil flowing into the back pressure chamber S3 supports the turning scroll 50 so that the turning scroll 50 rises toward the fixed scroll 40, and thus the fixed wrap 42 and the turning wrap 52. 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 turning scroll 50 continuously compresses the refrigerant while rotating, and a part of the compressed refrigerant moves to the back pressure chamber S3 through the oil supply passage 110 to perform the back pressure. The pressure of the seal S3 is kept constant. Here, only one outlet of the oil supply passage 110, that is, the second passage hole 112 is formed, but the second passage hole 112 has both the turning wraps 52 therebetween as shown in FIG. As each alternately communicates with the compression chamber (P), the oil may be uniformly supplied to each compression chamber (P) through the oil supply passage (110).

Accordingly, the turning wrap 52 of the turning scroll 50 and the fixing wrap 42 of the fixed scroll 40 are in close contact with the hard plate portions 41 and 51 of the scroll facing each other, so that the compression chamber P ) Can effectively block leakage of the refrigerant in the axial direction, that is, the height direction of the wrap. In particular, even when the pressure rise of the back pressure chamber S3 is delayed while the compressor is operated at low speed and oil is not smoothly sucked up from the oil storage part of the casing 10, the refrigerant in the compression chamber P is back pressure chamber S3. By rapidly increasing the pressure of the orbiting scroll 50 can be increased quickly, thereby increasing the efficiency of the compressor.

In addition, as the turning scroll 50 continuously rotates, oil is introduced into the compression chamber P from the back pressure chamber S3 to reduce friction loss in the compression chamber P as well as the two side wraps. The side, that is, the radial direction of the sealing can increase the efficiency of the compressor. In particular, when the compressor is operating at a low speed, the oil is not sufficiently filled in the back pressure chamber (S3) or the pressure in the back pressure chamber (S3) is not high enough, so that the oil is fixed to the fixed scroll (40) and the turning scroll (50). Even though the suction surface is not smoothly sucked into the compression chambers P, the oil is supplied directly to the compression chambers P through the oil supply passage 110, so that friction loss or leakage in the compression chambers is prevented. Can be prevented in advance, thereby improving the performance of the compressor. In addition, when the compressor is operating at a high speed, the oil is excessively introduced into the back pressure chamber (S3) and the oil is in contact with the fixed scroll 40 while the fixed scroll 40 and the turning scroll 50 is in close contact with each other. Even if the oil does not flow between the scrolls 50, the oil is supplied to the compression chamber P through the oil supply passage 110, so that the friction loss or the leakage in the radial direction due to the oil shortage in the compression chamber P is not sufficient. To prevent it.

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

For example, in the refrigerator 700 having a refrigerant compression type refrigeration cycle including a compressor, a condenser, an expander and an evaporator as shown in FIG. 7, the main board 710 controls the overall operation of the cold synchronizer in the refrigerator 700. The scroll compressor (C) may be connected to the fuel cell, and an oil supply passage may be formed such that the compression chamber and the back pressure chamber communicate with the fixed scroll installed inside the scroll compressor C as described above.

In this way, it is possible to effectively block the friction loss and refrigerant leakage in the compressor to increase the efficiency of the compressor, thereby improving the energy efficiency of the refrigeration apparatus to which the compressor is applied. In addition, since the oil supply passage of the compressor can be easily processed, the productivity of the compressor and the refrigerating apparatus to which the compressor is applied 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 the scroll compressor of the present invention;

FIG. 2 is a perspective view of the compression unit broken in the scroll compressor according to FIG. 1; FIG.

3 is a perspective view showing an enlarged oil supply passage in the scroll compressor according to FIG. 2;

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

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

6 is a longitudinal cross-sectional view showing that the oil supply passage is in communication with the back pressure chamber during the swing motion of the swing scroll in the scroll compressor according to FIG.

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

** Description of symbols for the main parts of the drawing **

20: main frame 23: back pressure groove

40: fixed scroll 41: fixed scroll plate portion

42: fixed wrap 50: turning scroll

51: turning scroll plate 110: oil supply passage

111,112: passage hole 113,114: communication groove

115: sealing groove 120: blocking member

Claims (13)

A casing having a closed inner space; A frame fixed to the casing; A fixed scroll fixed to the frame and having a spiral wrap formed on one side thereof; A swing scroll provided between the frame and the fixed scroll, wherein a spiral wrap is formed to form a pair of compression chambers that continuously move while engaging the wrap of the fixed scroll and pivoting; Including, A back pressure chamber is formed on the rear surface of the swing scroll so that the fixed scroll and the swing scroll are axially sealed by the swing scroll, the fixed scroll, and the frame. And a feed passage through which the compression chamber and the back pressure chamber communicate with the fixed scroll. The method of claim 1, And the feed passage is formed such that one end thereof communicates with the pair of compression chambers alternately. The method of claim 2, And the oil passage is formed such that an inner diameter thereof is not larger than a wrap thickness of the turning scroll. The method of claim 1, The oil supply passage axially from the upper surface of the fixed scroll so that the first passage hole communicating in the back pressure chamber, the second passage hole communicating in the compression chamber, and the first passage hole and the second passage hole communicate with each other. And a first communication groove formed at a predetermined depth and separated from the inner space of the casing by a separate blocking member. The method of claim 4, wherein And the first passage hole has an end communicating with the first communication groove inclined toward the second passage hole. The method of claim 4, wherein And the first passage hole and the second passage hole are formed in the same cross-sectional area. The method of claim 4, wherein The second passage is formed of a single scroll compressor in communication with the pair of compression chambers alternately. The method of claim 4, wherein The blocking member is a scroll compressor that is pressed or bolted into the first communication groove. The method of claim 8, The blocking member is a scroll compressor bolted to the first communication groove with a washer between the fixed scroll. The method of claim 4, wherein And a cross-sectional area of the second communication groove wider than the cross-sectional area of the first passage hole so that the first passage hole and the back pressure chamber communicate widely with the bearing surface of the fixed scroll that forms the bearing scroll. 10. The method of claim 9, And the second communication groove is formed to be elongated in the radial direction. The method of claim 1, Scroll length of the fixed scroll and the rotating scroll is formed asymmetrically. compressor; A condenser connected to the discharge side of the compressor; An expander coupled to the condenser; And And an evaporator connected to the inflator and connected to the suction side of the compressor. The compressor comprises a compressor of any one of claims 1 to 12.

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