KR101587171B1 - Scoroll compressor and refrigerator 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 discharge space is guided to the back pressure chamber between the main frame and the orbiting scroll and the orbiting scroll is supported by the pressure of the back pressure chamber, so that the orbiting scroll can be stably supported and the sealing force So that it can support more stable. In addition, lubricating performance of the bearing surface can be improved as the oil taken up through the oil passage of the crankshaft is supplied to the thrust bearing surface with the fixed scroll through the oil passage provided in the orbiting scroll, So that the friction loss can be prevented from being increased. In addition, as a part of the oil is supplied to the compression chamber through the oil passage, the sealing effect of the compression chamber can be enhanced and the lubrication performance can be improved.

Scroll compressor, oil passage, back pressure chamber, sealing member

Description

[0001] SCROLOL COMPRESSOR AND REFRIGERATOR HAVING THE SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a scroll compressor and a refrigeration apparatus using the scroll compressor, and more particularly, to a scroll compressor that supports the back surface of an orbiting scroll using discharge pressure and lubricates between both scrolls .

The scroll compressor is a compressor for compressing a refrigerant gas by changing the 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 can be largely divided into a low pressure type and a high pressure type according to the pressure of the refrigerant filled in the inner space of the casing. In the low pressure scroll compressor, the suction pipe communicates with the inner space of the casing, and the discharge pipe communicates with the discharge side of the compression unit, and the refrigerant is indirectly sucked into the compression chamber. On the other hand, in the high-pressure scroll compressor, the suction pipe communicates directly with the suction side of the compression unit, and the discharge pipe communicates with the internal space of the casing, and the refrigerant is directly sucked into the compression chamber. In the case of a low-pressure scroll compressor, the internal space of the casing is divided into a suction space and a discharge space, and a compression unit is disposed between the suction space and the discharge space.

In the low-pressure scroll compressor, the tip-room type and the back-pressure type are widely known as a method for sealing between the fixed scroll and the orbiting scroll. In the tip chamber method, a tip chamber is provided on the end surface of the wrap of each of the scrolls so that the tip chamber is in close contact with the opposing end plate portion to seal between the compression chambers. The back pressure system presses the back surface of the fixed scroll or orbiting scroll, So that the space between the compression chambers is sealed.

In the above-described back pressure system, an intermediate pressure hole is formed in the orbiting scroll in the axial direction so as to move the intermediate pressure refrigerant compressed in the compression chamber between the orbiting scroll and the main frame, A method is known in which the intermediate pressure refrigerant moving between the scroll and the main frame supports the orbiting scroll.

In this case, in order to lubricate the bearing surface between the fixed scroll and the orbiting scroll, an oil supply hole is formed in the end plate portion of the orbiting scroll in the axial direction so that oil, which is sucked in the suction space of the casing, To the fixed scroll side bearing surface is known.

However, in the low-pressure scroll compressor using the conventional back pressure system as described above, the back pressure chamber must maintain a high sealing state so that the fixed scroll and the orbiting scroll are closely contacted to prevent refrigerant leakage in the compression chamber. However, when a clearance is formed between the main frame, the fixed scroll, and the orbiting scroll forming the intermediate compression chamber, the pressure of the back pressure chamber is not maintained constant and the refrigerant leakage occurs between the compression chambers, There was a problem.

The conventional back pressure type low pressure scroll compressor as described above is characterized in that an oil supply hole is formed axially in a longitudinal plate portion of the orbiting scroll to supply oil that is sucked up between the fixed scroll and the orbiting scroll, The oil absorbed by the casing may not smoothly pass through the narrow frame-side bearing surface, thereby causing the frictional loss of the compressor to be increased while the oil is not sufficiently supplied to the bearing surface between the two scrolls There is a problem that the performance of the compressor is deteriorated.

The low pressure scroll compressor of the conventional back pressure type as described above is characterized in that the orbiting scroll is supported to the fixed scroll side by the pressure on the back side thereof, but in this case, when the back pressure supporting the orbiting scroll is excessively raised, There is a problem that the frictional loss between the orbiting scroll and the fixed scroll is excessively close to the fixed scroll side.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scroll compressor capable of maintaining a high sealing state of the back pressure chamber so that the efficiency of the compressor can be improved, and a refrigeration apparatus using the same.

Another object of the present invention is to provide a scroll compressor capable of supplying oil smoothly between both scrolls even when the compressor is operated at a low speed, and a refrigeration apparatus using the same.

It is another object of the present invention to provide a scroll compressor which can appropriately support upper and lower sides of the orbiting scroll to prevent the orbiting scroll from being excessively brought into close contact with the main frame or the fixed scroll and thereby reducing the friction loss between the both scrolls, And to provide a refrigeration apparatus using the scroll compressor.

In order to solve the object of the present invention, a frame installed in an inner space of a casing; A fixed scroll installed on the frame; And an orbiting scroll installed between the frame and the fixed scroll and forming a compression chamber while being pivotally engaged with the fixed scroll and having a boss portion formed at one side thereof to be coupled with a crankshaft, An oil passage extending from one side to the other side of the orbiting scroll in the boss portion is formed to penetrate through the bearing surface between the fixed scroll and the orbiting scroll, and the fixed scroll or orbiting scroll is provided with an oil passage communicating with the outlet of the oil passage And a groove which is not smaller than the cross section of the oil passage is formed.

Further, in order to solve the object of the present invention, a frame installed in an inner space of a casing; A fixed scroll installed on the frame; And an orbiting scroll installed between the frame and the fixed scroll and forming a compression chamber while being pivotally engaged with the fixed scroll and having a boss portion formed on one side thereof to be coupled with a crankshaft, An oil passage extending from one side surface to the other side surface of the orbiting scroll inside the boss portion is formed and the oil passage passes through the compression chamber before the compression chamber is opened.

Further, in order to solve the object of the present invention, a frame installed in an inner space of a casing; A fixed scroll installed on the frame; And an orbiting scroll installed between the frame and the fixed scroll and forming a compression chamber while being pivotally engaged with the fixed scroll and having a boss portion formed at one side thereof to be coupled with a crankshaft, A first oil passage penetrating from one side to the other side of the orbiting scroll belonging to the inside of the boss portion is formed to pass through the bearing surface between the fixed scroll and the orbiting scroll, The second oil passage penetrating from one side to the other side of the compression chamber is formed to pass through before the compression opening time of the compression chamber.

According to another aspect of the present invention, there is provided a compressor comprising: a compressor; 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 the suction side of the compressor, wherein the compressor includes a back pressure passage for guiding the fluid in the discharge space to the bearing surface between the frame and the orbiting scroll, and a bearing surface between the both scrolls An oil passage for guiding the oil and a second oil passage for guiding the oil before the time of opening of the compression chamber are provided.

The scroll compressor according to the present invention and the refrigerating machine employing the scroll compressor stably support the orbiting scroll by guiding the oil in the discharge space to the back pressure chamber between the main frame and the orbiting scroll and supporting the orbiting scroll with the pressure of the back pressure chamber The sealing force of the back pressure chamber is increased as the back-pressure chamber is filled with oil, so that the orbiting scroll can be supported more stably and the efficiency of the compressor can be increased, thereby improving the energy efficiency of the refrigeration apparatus using the compressor Can be improved.

The lubricating performance of the bearing surface can be improved as the oil taken up through the oil passage of the crankshaft is supplied to the thrust bearing surface with the fixed scroll through the oil passage provided in the orbiting scroll. It is possible to prevent the frictional losses from being excessively brought into contact with each other. In addition, as a part of the oil is supplied to the compression chamber through the oil passage, the sealing effect of the compression chamber can be enhanced and the lubrication performance can be improved.

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

FIG. 1 is a longitudinal sectional view showing a scroll compressor according to the present invention, FIG. 2 is a perspective view in which a compression unit is exploded in a scroll compressor according to FIG. 1, FIG. 3 is a longitudinal sectional view showing a compression unit assembled in the scroll compressor according to FIG. FIG. 4 is an enlarged perspective view of the first oil passage and the second oil passage in the compression unit according to FIG. 3, and FIG. 5 is a perspective view of the compression unit in the scroll compressor according to the first embodiment.

1, a low-pressure scroll compressor according to the present invention includes a casing 10 having a closed inner space, a main frame 20 fixed to both upper and lower inner spaces of the casing 10, A driving motor 40 mounted between the main frame 20 and the sub frame 30 to generate a rotational force and a fixed scroll 50 fixedly installed on the upper surface of the main frame 20, An orbiting scroll 60 pivotally mounted on the upper surface of the main frame 20 to engage with the fixed scroll 50 to form a compression chamber P, And an Oldham's ring 70 for rotating the orbiting scroll 60 while preventing the orbiting scroll 60 from rotating.

The closed space of the casing 10 is partitioned into a suction space S1 and a discharge space S2 by the main frame 20 and the fixed scroll 50 so that the suction space S1 is provided with a gas suction pipe And the gas discharge pipe 12 is connected to the discharge space S2. The bottom surface of the suction space (S1) of the casing (10) is filled with oil.

The main frame 20 is formed with a shaft hole 21 at the center thereof and an oil reservoir groove 22 is formed at the upper end of the shaft hole 21 so as to collect oil picked up by a crank shaft 43, .

The driving motor 40 includes a stator 41 fixed to the inside of the casing 10 and supplied with power from the outside and a stator 41 disposed inside the stator 41 with a predetermined gap therebetween, And a crankshaft 43 coupled to the rotor 42 by heat shrinkage and transmitting the rotational force of the driving motor 40 to the orbiting scroll 60. [ The crankshaft 43 has an oil passage 43a extending axially therethrough and an oil pump 44 provided at a lower end of the oil passage 43a.

The stationary scroll 50 is formed in a spiral shape with a fixed lap 52 constituting a pair of two compression chambers P on the bottom surface of the hard plate portion 51, A discharge port 54 for discharging the compressed refrigerant into the discharge space S2 of the casing 10 is formed at the center of the upper surface of the hard plate portion 51, Is formed. A check valve 55 is provided at the upper end of the discharge port 54 to prevent the refrigerant discharged into the discharge space S2 from flowing back to the compression chamber P.

The orbiting scroll 60 is formed on the upper surface of the hard plate portion 61 with the fixed lap 52 of the fixed scroll 50 and the orbiting lap 62 constituting a pair of two compression chambers P spirally formed And a boss portion 63 coupled to the crankshaft 43 and receiving the power of the driving motor 40 is formed at the center of the bottom of the hard plate portion 61.

The fixed scroll (50) and the orbiting scroll (60) may be formed asymmetrically with the wrap length of the orbiting scroll (60) by about 180 degrees longer than the wrap length of the fixed scroll (50) The lap lengths of the side scrolls 50 and 60 may be formed in the same symmetrical shape.

The scroll compressor of the present invention operates as follows.

That is, when power is applied to the driving motor 40, the crankshaft 43 rotates together with the rotor 42 to transmit rotational force to the orbiting scroll 60, The scroll 60 is rotated by an eccentric 70 so as to eccentrically move from the upper surface of the main frame 20 by the eccentric distance of the fixed lap 52 and the orbiting scroll 60 of the orbiting scroll 60, A pair of compression chambers P continuously moving between the compression chambers 62 are formed. The compression chamber (P) is moved to the center by the continuous swirling motion of the orbiting scroll (60), and the volume of the compression chamber (P) decreases to compress the refrigerant sucked in.

At the same time, the oil pump 44 installed at the lower end of the crankshaft 43 pumps the oil filled in the casing 10, and this oil flows through the oil passage 43a of the crankshaft 43 The main frame 20 and the orbiting scroll 60 are inserted into the bearing hole 21 of the main frame 20 or collected in the oil storage groove 22 of the main frame 20, The surface is lubricated.

The stationary scroll 50 and the orbiting scroll 60 are formed such that the distal ends of the stationary wrap 52 and the orbiting wrap 62 are in close contact with the plate portions 51 and 61 of the respective scroll 50 and 60, So that refrigerant leakage between the compression chambers P can be prevented. A back pressure chamber is formed between the main frame 20 and the orbiting scroll 60 and a hole is formed in the orbiting scroll 60 so that a part of the refrigerant in the intermediate compression chamber P So that the orbiting scroll is supported at the intermediate pressure of the refrigerant. However, in this case, due to the characteristics of the scroll compressor in which the behavior of the orbiting scroll (60) is not constant, the sealing state of the back pressure chamber may become poor, whereby the refrigerant in the back pressure chamber leaks into the suction space, ) May not be fully supported. On the other hand, when the pressure in the back pressure chamber excessively increases, the bearing surface between the orbiting scroll and the fixed scroll may be squeezed to cause a friction loss.

In view of this, in the present invention, a part of the refrigerant and oil discharged into the discharge space (S2) flows into the back pressure chamber so as to increase the sealing state of the back pressure chamber by viscosity of the oil. For example, as shown in FIGS. 1 to 3, the upper end of the hard plate portion 51 of the fixed scroll 50, that is, the upper end portion of the edge portion where the fixed lap 52 is not formed, A back pressure passage 110 is formed in the upper surface of the main frame 20 so as to penetrate the upper surface of the main frame 20, that is, the surface forming the bearing surface with the orbiting scroll 60. On the outlet side of the back pressure passage 110, Sealing members 120 to be described later are installed on both sides of the back pressure passage 110 with the back pressure passage 110 interposed therebetween to form the back pressure chamber 130.

The back pressure passage 110 has a first discharge pressure hole 111 formed to pass through the outer hard portion 51 of the fixed scroll 50 and a second discharge pressure hole 111 communicating with the first discharge pressure hole 111, And a second discharge pressure hole 112 formed through the discharge port 20.

The first discharge pressure hole 111 may be formed axially in the fixed scroll 50 as shown in the drawing, or may be inclined to the fixed scroll 50 in some cases. 2, the oil discharged into the discharge space S2 and flowing down to the upper surface of the fixed scroll 50 of the fixed scroll 50 is collected at the inlet end of the first discharge pressure hole 111, A guide groove 113 having a width larger than that of the first discharge hole 111 may be formed. The guide groove 113 may be formed in a funnel-shaped, inverted trapezoidal cross-sectional shape, so that the oil flow smoothly becomes preferable. The upper surface of the hard plate portion 51 of the fixed scroll 50 is fixed to the upper surface of the hard plate portion 51 of the fixed scroll 50 so that the oil can be smoothly guided to the first discharge pressure hole 111 May be formed to be inclined toward the first discharge pressure hole (111).

The second discharge pressure hole 112 is formed in the orbiting scroll in a U shape and the inlet end of the second discharge pressure hole 112 communicates with the first discharge pressure hole 111, Is formed to communicate with the back pressure chamber 130, that is, the bearing surface between the main frame 20 and the orbiting scroll 60. The second discharge pressure hole 112 may be formed so that a single flow passage, that is, an outlet is connected to the back pressure chamber 130, may be formed in a plurality of passages, An exhaust hole (not shown) may be further formed in the suction space S1 of the casing 10. [ When the exhaust hole is formed, when the refrigerant flows into the second discharge pressure hole 112, the refrigerant leaks into the suction space S1, so that the pure oil as much as possible is introduced into the back pressure chamber 130 do. Here, the inner diameter of the exhaust hole may be smaller than the inner diameter of the second discharge pressure hole 112 to lower the pressure of the refrigerant leaking from the second discharge pressure hole 112 to the suction space S1 . Of course, the exhaust hole may be formed in the first discharge pressure hole.

The guide tube 114 can be inserted between the first discharge pressure hole 111 and the second discharge pressure hole 112 so that both the holes 111 and 112 can communicate without turning. To this end, the first discharge pressure hole 111 is formed wider than the second discharge pressure hole 112, and the inlet end of the second discharge pressure hole 112 is extended And the guide tube 114 inserted into the second discharge pressure hole 112 is inserted into the first discharge pressure hole 111 to be separated from the first discharge pressure hole 111 and the second discharge pressure hole 112 To prevent the oil from leaking to the joints between the two ends.

The sealing members 120 are inserted into the sealing grooves 23 provided on the upper surface of the main frame 20, respectively. The sealing members 120 may be formed in any shape as long as they can prevent the refrigerant and the oil from leaking in the radial direction. In the present embodiment, a sealing member, which is a type of face seal having elasticity, can be applied to increase the sealing force. For example, the sealing member of the present embodiment has a sealing part 121 formed in a diagonal cross-sectional shape as shown in FIG. 2 and one side thereof being in close contact with the bottom surface of the orbiting scroll 60, And a supporting portion 122 which is inserted into the internal space 121a of the supporting portion 121 to elastically support the sealing portion 121. [

The sealing part 121 and the supporting part 122 are both formed in an annular shape in a planar projection and a plurality of sealing grooves 23 into which the sealing members 120 are inserted are also formed in an annular shape in a planar projection.

2, the radial distance between the sealing members 120, that is, the cross section of the back pressure chamber 130 is at least equal to the cross section of the back pressure passage 110, that is, the cross section of the second discharge pressure hole 112 It is preferable to increase the sectional area of the intermediate pressure chamber so as to stably support the orbiting scroll (60).

In addition, the back pressure chamber 130 may be formed on the inner surface of the back pressure chamber 130 so as to form a bearing surface. However, the first back pressure groove 131 may have a predetermined depth and width as shown in FIG. In this case, the refrigerant and oil flowing into the back pressure chamber 130 through the back pressure passage 110, that is, the second discharge pressure hole 112, quickly move along the first back pressure groove 131 to the back pressure chamber 130, The entire pressure of the back pressure chamber 130, that is, the intermediate pressure chamber, can be made uniform quickly, and the orbiting scroll 60 can be more stably supported.

For example, the first back pressure groove 131 is formed in an annular shape along the circumferential direction, and the outlet of the back pressure passage 110, that is, the second discharge pressure hole 112 It is preferable that the outlet is formed to communicate. The cross section of the first back pressure groove 131 may be smaller than the cross section of the back pressure chamber 130. The first back pressure groove 131 may have a rectangular cross section, but it may be more advantageous to have a semicircular section or a trapezoidal section in order to allow the refrigerant and the oil to move quickly.

Meanwhile, although not shown in the drawing, the sealing grooves may be formed on the bottom surface of the orbiting scroll. In this case as well, the sealing members can be formed identically. The first back pressure groove may be formed on the bottom surface of the orbiting scroll. In this case, the shape of the first back pressure groove may be formed in the same manner as in the above-described embodiment.

The operation and effect of the scroll compressor according to the present invention as described above are as follows.

That is, when the orbiting scroll 60 is pivoted, refrigerant and oil sucked into the suction space S1 of the casing 10 pass through the suction grooves 53 of the fixed scroll 50, P and the refrigerant and the oil gradually move toward the center along the movement locus of the compression chamber P and are discharged to the discharge space S2 of the casing 10 through the discharge port 54. [

The refrigerant discharged to the discharge space S2 and the oil are separated from the inner wall surface of the casing 10 constituting the discharge space S2 and the refrigerant is moved to the refrigeration cycle apparatus through the gas discharge pipe 12 , Most of the oil flows down to the upper surface of the fixed scroll (50) along the inner wall surface of the casing (10). The oil flowing down to the upper surface of the fixed scroll (50) collects around the first discharge pressure hole (111) constituting the back pressure passage (110). At this time, when the guide groove 113 is formed on the upper surface of the fixed scroll 50, the oil can be gathered in the first discharge pressure hole 111 more quickly.

The oil collected in the first discharge pressure hole 111 flows into the first discharge pressure hole 111 by the weight of the oil and the pressure of the discharge space S2, And flows into the back pressure chamber 130 between the main frame 20 and the orbiting scroll 60 through the second discharge pressure hole 112 of the second discharge hole 112. [ The oil flowing into the back pressure chamber 130 pressurizes the back surface of the orbiting scroll 60 by raising the pressure of the back pressure chamber 130 so that the orbiting scroll 60 is pushed up and is brought into close contact with the fixed scroll 50 . Thus, the compression chamber (P) between the fixed scroll (50) and the orbiting scroll (60) is tightly sealed to prevent the refrigerant leakage in the compression chamber (P), thereby improving the efficiency of the compressor.

As described above, since the refrigerant discharged from the discharge space S2 and the oil are introduced into the back pressure chamber 130, a relatively large amount of refrigerant and oil are supplied to the intermediate pressure chamber, that is, the back pressure chamber 130 Can be supplied. That is, as the inlet end of the back pressure passage 110 forms the discharge pressure, the oil is pressurized by the pressure difference, so that the oil in the discharge space S2 can be smoothly supplied to the back pressure chamber 130 will be.

In this way, even when a relatively large amount of oil is supplied to the back pressure chamber 130, the oil filled in the back pressure chamber 130 may be discharged to the sealing member (not shown) even if the orbiting scroll 60 has a slight unstable behavior due to the movement characteristics of the scroll compressor. 120) and the orbiting scroll (60) to prevent the pressure of the back pressure chamber (130) from being lowered, thereby stably supporting the orbiting scroll (60). At this time, when an exhaust hole (not shown) is formed in the middle of the second discharge pressure hole 112, a small amount of refrigerant flowing into the back pressure passage 110 leaks into the suction space S1 through the exhaust hole So that only the oil can be filled into the back pressure chamber 130 as much as possible.

On the other hand, when refrigerant and oil are excessively introduced into the back pressure chamber through the back pressure passage, the pressure of the back pressure chamber becomes excessively high, and the orbiting scroll is excessively brought into close contact with the fixed scroll to increase the frictional loss between the two scrolls . Therefore, in order to reduce the friction loss between both scrolls and to improve the performance, a refrigerant or oil of a predetermined pressure is supplied to the upper thrust bearing surface of the orbiting scroll, that is, the surface forming the thrust bearing surface together with the lower surface of the fixed scroll, It may be desirable to lubricate.

2 to 5, a part of the oil taken up through the crankshaft 23 is supplied to the fixed plate portion 61 of the orbiting scroll 60 through the fixed scroll 50 and the orbiting scroll 50, A first oil passage 150 for guiding to the thrust bearing surface between the first oil passage 60 and the second oil passage 60 may be formed in the radial direction.

The first oil passage 150 includes a first connection hole 151 communicating with the oil groove 65 formed in the center of the bottom surface of the orbiting scroll 60 by a predetermined depth in a radial direction and passing through the oil groove 65, And a first outlet passage (152) formed at a predetermined depth in the axial direction so as to communicate with the thrust bearing surface opposite to the thrust bearing surface of the fixed scroll (50) near the outer end of the connection hole (151).

The first connection hole 151 is formed in a radial direction outside the range of the suction groove 53 provided in the fixed scroll 50. The outer end of the first connection hole 151 is formed in a separate small Prevent leakage of oil by blocking with member.

The first outlet passage 152 may have the same cross section as the end surface of the second discharge hole 112 of the back pressure passage 110. The orbiting scroll 60 may be formed in the same shape as the fixed scroll 50, It may be preferable to be formed smaller than the cross section of the second discharge hole 112 so as to be stably sealed. The pressure supplied through the back pressure passage 110 is a discharge pressure, and the pressure supplied through the first oil passage 150 is an intermediate pressure lower than the discharge pressure. For example, the outlet of the back pressure passage 110 The orbiting scroll 60 can be floated by the pressure difference even if the end face and the exit end face of the first oil passage 150 are the same. However, when the compressor is started, that is, when the discharge pressure does not sufficiently rise, the intermediate pressure may be higher and the pressure of the first oil passage 150 may be higher than or equal to the pressure of the back pressure passage 110 . The second discharge hole 112 of the back pressure passage 110 should be formed to be somewhat wider than the first outlet passage 152 of the first oil passage 150 in consideration of such a case, A large amount of refrigerant and oil are supplied to allow the orbiting scroll 60 to float.

The oil supplied through the first oil passage 150 to the outlet of the first oil passage 150, that is, the end of the first oil passage 150, A second back pressure groove (not shown) may be formed.

The second back pressure grooves (not shown) may be formed in an arc shape extending along the circumferential direction like the first back pressure grooves 131 described above, and the cross section of the second back pressure grooves (not shown) It may be preferable to be formed not less than the cross section of the outlet passage 152.

The scroll compressor as described above has the following operational effects.

A part of the oil taken up through the crankshaft 23 flows into the upper thrust bearing surface between the fixed scroll 50 and the orbiting scroll 60 through the first oil passage 150, do. The oil flowing into the first outlet passage 152 flows into the first back pressure groove 131 provided in the fixed scroll 50 or the second back pressure groove 131 provided at the end of the first outlet passage 152, And then flows into the back pressure groove 153 and spreads over the upper thrust bearing surface. The oil introduced into the upper thrust bearing surface also acts as an intermediate pressure between the fixed scroll (50) and the orbiting scroll (60), more precisely lower than the intermediate pressure between the main frame (20) and the orbiting scroll Pressure is formed to prevent the orbiting scroll (60) from rising above a proper amount, thereby preventing the orbiting scroll (60) from being excessively brought into close contact with the fixed scroll (50) to increase the friction loss, thereby improving the performance of the compressor .

As a certain amount of oil is supplied to the upper thrust bearing surface of the orbiting scroll (60) through the first oil passage (150), the upper thrust bearing surface is lubricated by the oil, The performance of the compressor can be further improved by reducing the friction loss between the two scrolls during the turning motion.

In the meantime, according to the present invention, a portion of the oil taken up through the oil passage of the crankshaft is guided to the entrance of the compression chamber, that is, before the compression opening time, At the same time, the friction loss in the compression chamber can be reduced.

3 to 5, the second oil passage 160 is formed in the oil groove 65 in a radial direction, that is, in the suction groove 53 without being in coincidence with the first connection hole 151 And a second connection hole (161) communicating in a radial direction within the first connection hole (161) and communicating with the suction groove (53) in the vicinity of the outer end of the second connection hole (161) And an outlet passage 162.

The second connection hole 161 may be formed to pass through the outer peripheral surface in the center direction like the first connection hole 151, and the outer end of the second connection hole 161 may be sealed with a small bolt.

The second outlet passage 162 may be formed to pass through the upper surface of the second outlet passage 162 so that the end of the second outlet passage 162 may be positioned within the range of the suction groove 53 of the fixed scroll 50. Of course, the second outlet passage 162 may be formed at the end, i.e., the outlet end, of the intermediate compression chamber outside the suction groove 53, but refrigerant leakage may occur in this case, which is undesirable.

As described above, when the oil sucked through the crankshaft is guided to the compression chamber, its action and effect are as follows.

6, a part of the oil taken up through the crankshaft 23 flows into the inlet side of the compression chamber P through the second oil passage 160. As shown in FIG. Then, the oil introduced into the second outlet passage 162 rapidly flows into the compression chamber P together with the refrigerant sucked at the end of the second outlet passage 162, and flows along with the locus of the compression chamber together with the refrigerant . The fixed scroll (50) and the orbiting scroll (60) are tightly sealed between the fixed scroll (50) constituting the compression chamber and the orbiting scroll (60) by the oil flowing in the compression chamber (P) And the performance of the compressor can be further improved.

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 And the back pressure chamber between the main frame 20 and the orbiting scroll 60 provided in the scroll compressor C is communicated with the discharge space S2, The performance of the scroll compressor can be improved by effectively lubricating the orbiting scroll 60 and the fixed scroll 50 while stably supporting the scroll 60 and the energy efficiency of the refrigerating machine to which the compressor is applied can be improved. In addition, by supplying the oil absorbed through the crankshaft 23 to the bearing surface between the two scrolls 50 and 60 and the compression chamber, the orbiting scroll 60 can be prevented from floating excessively, The frictional loss between the scroll 60 and the scroll 60 is increased while the sealing force of the compression chamber P is increased and the frictional loss between the two scrolls 50 and 60 constituting the compression chamber P is reduced, So that the energy efficiency of the refrigerating machine 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 scroll compressor according to the present invention,

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

FIG. 3 is a longitudinal sectional view showing a compressed portion assembled in the scroll compressor of FIG. 1,

FIG. 4 is an enlarged perspective view of the first oil passage and the second oil passage in the compression section according to FIG. 3;

FIG. 5 is a perspective view of a compression unit according to the scroll compressor of FIG. 1,

FIG. 6 is a schematic view showing a state in which oil is guided to the bearing surface and the compression chamber in the scroll compressor according to FIG. 1;

FIG. 7 is a schematic view showing a refrigeration apparatus provided with the scroll compressor according to FIG. 1;

DESCRIPTION OF REFERENCE NUMERALS

10: casing 20: main frame

50: fixed scroll 60: orbiting scroll

110: back pressure passage 111: first discharge pressure hole

112: second discharge hole 120: sealing member

121: sealing part 122: supporting part

130: back pressure chamber 131: first back pressure groove

150: first oil passage 160: second oil passage

Claims (10)

A frame installed in an inner space of the casing; A fixed scroll installed on the frame; And And an orbiting scroll installed between the frame and the fixed scroll to form a compression chamber while pivotally engaged with the fixed scroll and having a boss portion formed at one side thereof to be engaged with the crankshaft, An oil passage penetrating from one side to the other side of the orbiting scroll belonging to the inside of the boss portion of the orbiting scroll is formed to pass through a bearing surface between the fixed scroll and the orbiting scroll, Wherein the fixed scroll or orbiting scroll is formed with a groove communicating with the outlet of the oil passage and not smaller than the cross section of the oil passage, And an outlet of the back pressure passage is formed on the bearing surface between the frame and the orbiting scroll so as to communicate with the inner space of the casing. A frame installed in an inner space of the casing; A fixed scroll installed on the frame; And And an orbiting scroll installed between the frame and the fixed scroll to form a compression chamber while pivotally engaged with the fixed scroll and having a boss portion formed at one side thereof to be engaged with the crankshaft, An oil passage extending from one side to the other side of the orbiting scroll belonging to the inside of the boss portion of the orbiting scroll, And the oil passage passes through before the compression opening time of the compression chamber. A frame installed in an inner space of the casing; A fixed scroll installed on the frame; And And an orbiting scroll installed between the frame and the fixed scroll to form a compression chamber while pivotally engaged with the fixed scroll and having a boss portion formed at one side thereof to be engaged with the crankshaft, A first oil passage penetrating from one side to the other side of the orbiting scroll belonging to the inside of the boss portion of the orbiting scroll is formed to pass through a bearing surface between the fixed scroll and the orbiting scroll, Wherein a second oil passage penetrating from one side to the other side of the orbiting scroll belonging to the inside of the boss portion of the orbiting scroll is formed to pass through before the compression opening time of the compression chamber. The method of claim 3, Wherein the fixed scroll or orbiting scroll is provided with a groove communicating with the outlet of the oil passage and not smaller than the cross section of the oil passage. The method of claim 3, Wherein a cross section of the first oil passage is formed not larger than a cross section of the second oil passage. The method according to claim 2 or 3, And an outlet of the back pressure passage is formed on the bearing surface between the frame and the orbiting scroll so as to communicate with the inner space of the casing. 4. The method according to any one of claims 1 to 3, An outlet of the back pressure passage is formed in the bearing surface between the frame and the orbiting scroll so as to communicate with the inner space of the casing, And a back pressure chamber is formed on the outlet side of the back pressure passage, the back pressure chamber being provided with sealing members on both sides of the back pressure passage. 8. The method of claim 7, Wherein a back pressure groove is formed along the circumferential direction at an outlet of the back pressure passage, and the back pressure groove is formed between a plurality of sealing members. 9. The method of claim 8, Wherein the cross section of the back pressure groove is formed so as not to be smaller than the end surface of the back pressure passage. 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.

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