KR101510699B1 - 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 intermediate pressure chamber between the main frame and the orbiting scroll, and the orbiting scroll is supported by the pressure of the intermediate pressure chamber, whereby the orbiting scroll can be stably supported. As the oil filling the intermediate pressure chamber increases the sealing force of the intermediate pressure chamber, the orbiting scroll can be more stably supported and the efficiency of the compressor can be increased, thereby improving the energy efficiency of the refrigeration apparatus using the compressor .

Scroll compressor, oil passage, oil 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 a rear surface of an orbiting scroll using a discharge pressure and a refrigeration apparatus using the same.

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, a middle pressure hole is formed in the orbiting scroll to move the intermediate pressure refrigerant, which is compressed in the compression chamber, between the orbiting scroll and the main frame, And the intermediate pressure refrigerant moving between the frames supports the orbiting scroll. In this case, two sealing members are radially disposed between the orbiting scroll and the main frame to form an intermediate pressure chamber.

However, in the back pressure system as described above, the refrigerant of the intermediate pressure mainly moves to the intermediate pressure chamber to support the orbiting scroll, which may not be suitable considering the fact that the actual behavior of the orbiting scroll is not constant . That is, the intermediate pressure chamber must maintain a high sealing state, so that the fixed scroll and the orbiting scroll are tightly adhered to each other to prevent refrigerant leakage from the compression chamber. However, when the orbiting scroll is slightly rotated during the orbiting motion, a gap is generated between the sealing member and the orbiting scroll or the main frame, so that the pressure of the intermediate pressure chamber is not maintained constant, And the compressor efficiency is lowered.

The present invention solves the above-mentioned problems of the conventional scroll compressor. The present invention provides a scroll compressor in which the intermediate pressure chamber can maintain a high sealing state to stably support the orbiting scroll, A scroll compressor, and a refrigeration apparatus using the scroll compressor.

To solve the object of the present invention, there is provided an air conditioner comprising: a casing in which a closed inner space is divided into a suction space and a discharge space; A frame fixedly installed on the casing; A fixed scroll fixed to the frame; And a revolving scroll installed between the frame and the fixed scroll, the revolving scroll forming a pair of compression chambers continuously moving while being pivotally engaged with the fixed scroll; And an oil passage for allowing oil discharged into the discharge space of the casing to flow into the space between the frame and the orbiting scroll is provided and the oil introduced through the oil passage hole is provided between the frame and the orbiting scroll There is provided a scroll compressor including an oil chamber for receiving oil.

A casing in which a closed inner space is divided into a suction space and a discharge space; A frame fixedly installed on the casing; A fixed scroll fixed to the frame; And a revolving scroll installed between the frame and the fixed scroll, the revolving scroll forming a pair of compression chambers continuously moving while being pivotally engaged with the fixed scroll; And an oil passage for allowing oil discharged into the discharge space of the casing to flow into the space between the frame and the orbiting scroll is formed and oil flows into the space between the frame and the orbiting scroll through oil holes at both sides of the outlet end of the oil passage, And a plurality of sealing members for allowing the plurality of sealing members to stay therebetween are provided at predetermined intervals in the radial direction.

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 discharge side oil of the compressor casing is supplied to an intermediate pressure chamber between the orbiting scroll and the frame supporting the orbiting scroll, Is supported by the freezing device.

The scroll compressor according to the present invention and the refrigeration apparatus using the scroll compressor guide the oil in the discharge space to the intermediate pressure chamber between the main frame and the orbiting scroll and support the orbiting scroll with the pressure of the intermediate pressure chamber, Can be done. As the oil filling the intermediate pressure chamber increases the sealing force of the intermediate pressure chamber, the orbiting scroll can be more stably supported and the efficiency of the compressor can be increased, thereby improving the energy efficiency of the refrigeration apparatus using the compressor .

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.

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 storage groove 22 is formed at the upper end of the shaft hole 21 so as to collect oil picked up through a drive 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 drive shaft 43 coupled to the rotor 42 by heat shrinkage and transmitting the rotational force of the drive motor 40 to the orbiting scroll 60. The drive shaft 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 driving shaft 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 driving shaft 43 rotates together with the rotor 42 to transmit rotational force to the orbiting scroll 60, The main body 60 is rotated by the eccentric distance from the upper surface of the main frame 20 by the otal bearing 70 so that the fixed lap 52 of the fixed scroll 50 and the orbiting lap 52 of the orbiting scroll 60 A pair of compression chambers P which continuously move 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 drive shaft 43 pumps the oil filled in the casing 10, and the oil is supplied to the upper end of the oil passage 43a of the drive shaft 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, Lubrication.

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. To this end, an intermediate pressure chamber is formed between the main frame 20 and the orbiting scroll 60, and a hole is formed in the orbiting scroll 60 to allow a part of the refrigerant in the compression chamber P to leak into the intermediate pressure chamber . 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 intermediate pressure chamber may be poor and the refrigerant in the intermediate pressure chamber leaks, It can not be supported. When the orbiting scroll (60) can not be sufficiently supported by the pressure of the intermediate pressure chamber, the wrap ends of the orbiting scroll (60) and the fixed scroll (50) Refrigerant leakage may occur and compressor efficiency may be greatly reduced.

In view of this, in the present invention, a part of the oil discharged into the discharge space (S2) is introduced into the intermediate pressure chamber so as to increase the sealing state of the intermediate pressure chamber by the 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, An oil passage hole 110 is formed in the upper surface of the oil passage hole 20 so as to pass through the surface forming the bearing surface with the orbiting scroll 60. The oil passage hole 110 is formed at the outlet side of the oil passage hole 110, Sealing members 120 are respectively installed on both sides of the oil passage hole 110 through the oil passage hole 110 to form an oil chamber 130 forming the intermediate pressure chamber.

The oil passage hole 110 includes a first oil hole 111 penetrating the outer end plate 51 of the fixed scroll 50 and a second oil hole 111 communicating with the first oil hole 111, And a second oil hole 112 penetratingly formed through the second oil hole 112.

The first oil hole 111 may be formed in an axial direction as shown in the drawing, or may be inclined depending on the case. As shown in FIG. 3, at the inlet end of the first oil hole 111, the oil discharged into the discharge space S2 and flowing down to the upper surface of the fixed plate 50 of the fixed scroll 50 is collected An oil guide groove 113 having a width larger than that of the first oil hole 111 can be formed. The oil guide groove 113 may be formed in a trapezoidal cross-sectional shape, so that the oil can flow smoothly. The upper surface of the hard plate portion 51 of the fixed scroll 50 is formed with an entire upper surface of the fixed scroll 50 so that the oil flowing down to the upper surface of the hard plate portion 51 can be more smoothly guided to the first oil hole 111 And may be inclined toward the first oil hole 111.

The second oil hole 112 is formed in a shape having a plurality of vertical portions and a horizontal portion. The second oil hole 112 may be formed so that a single oil passage, that is, an outlet, communicates with the oil chamber 130. However, in some cases, a plurality of oil passages may be formed, An exhaust hole 114 may be further formed toward the suction space S1 of the exhaust pipe 10. In the case where the exhaust hole 114 is formed, when the refrigerant flows into the second oil hole 112, the refrigerant leaks into the suction space S1 so that a large amount of oil flows into the oil chamber 130 as much as possible . The inner diameter of the exhaust hole 114 is smaller than the inner diameter of the second oil hole 112 to reduce the pressure of the refrigerant leaking from the second oil hole 112 to the suction space S1 And may be desirable.

The guide pipe 115 can be inserted between the first oil hole 111 and the second oil hole 112 so that the oil holes 111 and 112 can communicate with each other without breaking. The first oil hole 111 is formed to be wider than the second oil hole 112 and the inlet end of the second oil hole 112 is formed so as to be inserted into the guide pipe 115, The guide pipe 115 inserted into the second oil hole 112 is inserted into the first oil hole 111 and the oil is supplied to the joint between the first oil hole 111 and the second oil hole 112 It may be desirable to prevent leakage.

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 leakage of the oil 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 portion 121 formed in a diagonal cross-sectional shape as shown in FIGS. 3 and 4 and having one side thereof being in close contact with the bottom surface of the orbiting scroll 60, And a supporting part 122 inserted into the internal space 121a of the part 121 to elastically support the sealing part 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.

4, the radial distance between the sealing members 120, that is, the end face D1 of the oil chamber 130 is greater than the cross-sectional area D1 of the oil passage hole 110, that is, Is preferably at least not larger than the diameter D2 of the orbiting scroll 60, and more preferably, it is preferable to stably support the orbiting scroll 60 by widening the sectional area of the intermediate pressure chamber.

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 oil hole (111) constituting the oil passage hole (110). At this time, if the oil guide groove 113 is formed on the upper surface of the fixed scroll 50, the oil can be gathered in the first oil hole 111 more quickly.

The oil collected in the first oil hole 111 flows down to the first oil hole 111 by the weight of the oil and the pressure of the discharge space S2, And flows into the oil chamber 130 between the main frame 20 and the orbiting scroll 60 through the second oil hole 112.

The oil flowing into the oil chamber 130 pressurizes the back surface of the orbiting scroll 60 by raising the pressure of the oil chamber 130 or the intermediate pressure chamber so that the orbiting scroll 60 is pushed up, 50). Thus, the compression chamber P between the stationary 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.

Since the oil discharged into the discharge space S2 is introduced into the oil chamber 130 as described above, a relatively large amount of oil can be supplied to the intermediate pressure chamber, that is, the oil chamber 130 . That is, as the inlet end of the oil passage 110 forms the discharge pressure, the oil pressurizes the oil by the pressure difference, so that the oil in the discharge space S2 can be smoothly supplied to the oil chamber 130 will be.

In this way, even when a relatively large amount of oil is supplied to the oil chamber 130, the oil filled in the oil chamber 130 can not reach the sealing member 100 even if the orbiting scroll 60 experiences 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 oil chamber 130 from being lowered, thereby stably supporting the orbiting scroll 60. At this time, when the exhaust hole 114 is formed in the middle of the second oil hole 112, a small amount of refrigerant flowing into the oil hole 110 flows into the suction space S1 through the exhaust hole 114 So that the oil chamber 130 can be filled with oil as much as possible. When the oil is excessively supplied to the oil chamber 130, the pressure in the oil chamber 130, that is, the intermediate pressure chamber, rises excessively while the orbiting scroll 60 is excessively raised, A part of the oil flowing into the oil passage 110 may be leaked to the suction space S1 through the exhaust hole 114 so that the pressure of the intermediate pressure chamber may be properly measured It can also be kept under pressure.

Meanwhile, another embodiment of the scroll compressor according to the present invention is as follows.

That is, in the above-described embodiment, the oil chamber 130 is planar, that is, the bearing surface of the main frame 20 is formed to be flat between the sealing members 120, 6, an oil groove 131 having a predetermined depth and width is formed inside the oil chamber 130. In this case, the oil introduced into the oil chamber 130 through the oil passage 110, that is, the second oil hole 112, is quickly moved to the entire oil chamber 130 along the oil groove 131 The overall pressure of the oil chamber 130, that is, the intermediate pressure chamber, can be made uniform quickly, and the orbiting scroll 60 can be more stably supported.

5 and 6, the oil groove 131 is formed in an annular shape, and an outlet of the oil hole 110, that is, an outlet of the second oil hole 112 It is preferable that an outlet is formed. The cross section of the oil groove 131 may be smaller than the cross section of the oil chamber 130. As shown in FIG. 7, the oil groove 131 may have a rectangular cross-sectional shape. However, it may be more advantageous that the oil groove 131 is formed in a semicircular or trapezoidal shape in order to allow the oil to move more 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 oil groove may be formed on the bottom surface of the orbiting scroll. In this case, the shape of the oil groove may be formed in the same manner as in the above-described embodiment.

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. 8, 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 A scroll compressor (C) is connected to the scroll compressor (C), a fixed scroll installed in the scroll compressor (C) and an oil passage are formed in the main frame so that the oil of the discharge pressure flows into the oil chamber The pressure of the intermediate pressure chamber formed of the oil chamber is prevented from leaking, thereby enabling the orbiting scroll to be stably supported, thereby preventing leakage of the refrigerant between the compression chambers, thereby enhancing the compressor efficiency.

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.

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 oil passage and the periphery of the oil chamber in the compression unit according to FIG. 3;

FIG. 5 is a perspective view of another embodiment of the oil chamber in the compression section of the scroll compressor according to FIG. 2,

FIG. 6 is a longitudinal sectional view of another embodiment of the oil chamber in the compression section of the scroll compressor according to FIG. 2,

FIG. 7 is a schematic view showing the shape of an oil groove in the oil chamber according to FIG. 6,

FIG. 8 is a schematic view showing a refrigeration apparatus provided with the scroll compressor according to FIG. 1; FIG.

DESCRIPTION OF REFERENCE NUMERALS

10: casing 20: main frame

50: fixed scroll 60: orbiting scroll

110: oil passage 111: first oil hole

112: second oil ball 113: oil guide groove

114: exhaust hole 120: sealing member

121: sealing part 122: supporting part

130: Oil chamber 131: Oil groove

Claims (24)

A casing in which a closed inner space is divided into a suction space and a discharge space; A frame fixedly installed on the casing; A fixed scroll fixed to the frame; And A revolving scroll installed between the frame and the fixed scroll and forming a pair of compression chambers continuously moving while pivotally engaged with the fixed scroll; Including, An oil passage through which the oil discharged from the compression chamber into the discharge space of the casing flows between the frame and the orbiting scroll is extended from the back surface of the fixed scroll belonging to the discharge space to the thrust surface of the frame, Respectively, Wherein an oil chamber is provided in an outlet side of the oil passage so that oil flowing through the oil passage is received between the frame and the orbiting scroll, Wherein a sealing groove is formed at a predetermined distance in a radial direction on either one of the surfaces of the frame and the orbiting scroll, and the oil chamber is formed between a plurality of sealing members respectively inserted into the sealing grooves. delete delete delete The method according to claim 1, Wherein the sealing member has a sealing portion at least one side of which is in sliding contact with a bearing surface of the frame or orbiting scroll and a support portion provided inside the sealing portion and elastically supporting the sealing portion. The method according to claim 1, Wherein the oil chamber is formed with an annular oil groove having a predetermined depth so that oil contained in the oil chamber can move in a circumferential direction. The method according to claim 6, And the oil passage is formed in the oil groove. The method according to claim 6, And the cross section of the oil groove is formed so as not to be smaller than the cross section of the oil passage. The method according to claim 6, Wherein the oil groove is formed in any one of a cross section of a rectangular cross section, a semicircular cross section, or a trapezoid cross section. delete The method according to claim 1, Wherein the oil passage further comprises an exhaust hole communicating with the suction space in the middle thereof. 12. The method of claim 11, Wherein the cross section of the exhaust hole is formed to be smaller than or equal to the cross section of the oil passage. A casing in which a closed inner space is divided into a suction space and a discharge space; A frame fixedly installed on the casing; A fixed scroll fixed to the frame; And A revolving scroll installed between the frame and the fixed scroll and forming a pair of compression chambers continuously moving while pivotally engaged with the fixed scroll; Including, An oil passage is formed to allow the oil discharged into the discharge space of the casing to flow between the frame and the orbiting scroll, Wherein a plurality of sealing members are provided on both sides of the outlet end of the oil passage so as to allow the oil flowing between the frame and the orbiting scroll to flow through the oil passage, Wherein an oil groove having a predetermined depth is formed in an annular shape at an outlet end of the oil passage so that oil moving toward the oil chamber through the oil passage can move along the circumferential direction of the oil chamber. delete 14. The method of claim 13, Wherein the sealing member has a sealing portion at least one side of which is in sliding contact with a bearing surface of the frame or orbiting scroll and a support portion provided inside the sealing portion and elastically supporting the sealing portion. delete delete delete delete delete delete delete 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, 5 to 9, 11 to 13, and 15.

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