KR100937919B1 - A scroll compressor improved in function of oil circulation and back pressure control - Google Patents

Abstract

The present invention relates to a scroll compressor having an improved oil circulation and back pressure control function, comprising: a housing, a drive unit for generating rotational force, a drive shaft rotated by the drive unit and installed in the housing via a bearing at the rear, and It consists of a scroll wrap for compressing the fluid and is fixed regardless of the rotation of the drive shaft, and a fixed scroll having a discharge port for supplying refrigerant to the discharge chamber, and a swing scroll that is rotated by the rotation of the drive shaft and forms the scroll wrap In a scroll compressor composed of a scroll compression unit is configured, the refrigerant compressed by the scroll compression unit is sent to the discharge chamber, the refrigerant in the discharge chamber is separated into oil and gas in the oil separator, the gas is discharged through the refrigerant discharge port The oil is supplied to the back pressure chamber through the return passage formed in the fixed scroll. The base oil is characterized by having a configuration of returning into the housing through a back pressure control valve disposed in the rear end of the drive shaft past the return flow path formed in the drive shaft.

Accordingly, since the refrigerant is separated into oil and gas through an oil separator, the oil is sent back to the back pressure chamber, and the back pressure is controlled by the back pressure control valve, thereby circulating the oil, thereby lubricating and controlling the back pressure.

 Scroll, compressor, back pressure, oil, refrigerant, slewing, oil separator

Description

SCROLL COMPRESSOR IMPROVED IN FUNCTION OF OIL CIRCULATION AND BACK PRESSURE CONTROL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor having improved oil circulation and back pressure control functions, and more particularly to a scroll compressor having improved oil circulation and back pressure control functions for simultaneously performing oil circulation and back pressure control.

The structure of a general scroll compressor is disclosed in Korean Laid-Open Patent Publication No. 1998-0050613, which will be briefly described with reference to FIG.

As shown in the drawing, the conventional scroll compressor is provided with upper and lower frames 2 and 3 on the upper and lower sides of the sealed container 1, and the stator 4 between the upper and lower frames 2 and 3. ) Is fixed and installed, and the rotor 5 is inserted and installed at the inner circumference of the stator 4, and the drive shaft 6 penetrates the center of the upper frame 2 at the center of the rotor 5. It is press-fitted so that, the upper surface of the upper frame (2) is mounted on the rotational scroll (7) eccentrically coupled to the drive shaft (6) formed with a wrap (7) in an involute curve.

And, the upper side of the swinging scroll (7) is mounted on the fixed scroll (8) engaging with the wrap of the swinging scroll (7) to form a compression chamber is fastened to the edge of the upper frame (2), the upper frame (2) Between and the turning scroll (7) is the Oldham ring 9, which is a rotation prevention mechanism is coupled.

In the drawings, reference numeral 10 denotes a discharge cover, 11 a reverse displacement housing, 12 a suction pipe, and 13 a discharge pipe.

The conventional scroll compressor configured as described above rotates the drive shaft 6 while the rotor 5 rotates inside the stator 4 by an applied power source, and the drive shaft 6 rotates the turning scroll 7. Eccentric rotation of the eccentric distance is to be rotated, wherein the turning scroll (7) by the Oldham ring (9) is to make a pivoting movement at a distance away from the radius of the turning radius to the origin of the axis.

As a result of the swinging motion of the swinging scroll 7, a compression chamber (pocket) is formed between the swinging scroll 7 and each of the wraps 7a and 8a of the fixed scroll 8. The volume is reduced while moving to the center to further compress the sucked refrigerant gas.

Here, the back surface of the fixed scroll 8 and the bottom surface of the discharge cover 10 are each formed in a concave-convex structure, and a back pressure chamber 14 is formed on a corresponding surface of the concave-convex, and the back pressure chamber 14 The back pressure hole 14a is formed at one side of the back) in communication with the compression chamber of the fixed scroll (8), and a sealing material (not shown) is interposed on both sides of the back pressure chamber (14).

In the conventional scroll compressor configured as described above, the refrigerant gas introduced through the suction port (not shown) formed in the fixed scroll 8 is simultaneously sucked at both ends of the scroll circumference according to the swinging motion of the swinging scroll 7. It was trapped in two crescent pockets (or pockets or compression chambers) formed in the same volume, and the refrigerant gas was compressed in the process of moving toward the center while the pockets continuously decreased in volume.

In the conventional scroll compressor as described above, one back pressure hole 14a communicating with the back pressure chamber 14 is formed at a predetermined position of the fixed scroll 8, and the medium pressure refrigerant is passed through the back pressure hole 14a. The gas enters the back pressure chamber 14 and the fixed scroll 8 comes into close contact with the turning scroll 7 at the pressure to prevent leakage of the refrigerant gas.

However, in the related art, only the refrigerant performs a back pressure regulating function but not an oil circulation function for lubrication. Therefore, when the separate oil circulation device is installed, the entire structure becomes complicated and manufacturing is difficult.

The present invention is to solve the above problems, an object of the present invention is to provide a scroll compressor with improved oil circulation and back pressure control function that can perform a back pressure control function and a lubrication function at the same time.

In addition, an object of the present invention to provide a scroll compressor with improved oil circulation and back pressure control function that can increase the durability through the lubrication of the drive unit.

Another object of the present invention is to provide a scroll compressor having an improved oil circulation and back pressure control function, which can reduce the influence on the back pressure control valve even when the drive shaft rotates.

In addition, an object of the present invention is to provide a scroll compressor with improved oil circulation and back pressure control function that can simplify the assembly work and improve the productivity.

In order to achieve the above object, the scroll compressor with improved oil circulation and back pressure control function according to the present invention,

A housing, a drive unit for generating rotational force, a drive shaft installed on the housing via a rear bearing, and driven by the drive unit, and a scroll wrap for compressing the sucked fluid, and fixed regardless of the rotation of the drive shaft. A scroll compression unit comprising a fixed scroll having a discharge port for supplying a coolant to a discharge chamber and a rotating scroll which is rotated by rotation of the drive shaft, and a scroll wrap is formed, an eccentric action unit connected between the rotating scroll and the drive shaft; A scroll compressor comprising a main frame supporting the pivoting scroll in an axial direction and supporting the driving shaft in a rotational manner.

The refrigerant compressed by the scroll compression unit is sent to the discharge chamber,

Refrigerant in the discharge chamber is separated into oil and gas in the oil separator, the gas is discharged through the refrigerant discharge port, the oil is supplied to the back pressure chamber through the return passage formed in the fixed scroll,

The oil has a configuration of returning into the housing through a back pressure control valve disposed at the rear end of the drive shaft through a return flow path formed in the drive shaft.

A thrust plate is interposed between the pivoting scroll and the main frame, and a radial flow groove is formed on a surface of the main frame facing the thrust plate.

The oil passing through the flow groove passes through the eccentric action portion.

The oil passing through the back pressure regulating valve is returned to the housing through the rear bearing.

The back pressure control valve is characterized in that installed in the center of rotation of the drive shaft.

The back pressure control valve is assembled in advance and modularized, it is characterized in that the entire assembled is inserted into the drive shaft separately.

The back pressure control valve includes a valve case, a valve member sliding axially in the valve case, a spring for elastically supporting the valve member, and the valve member and a blocking member for preventing the spring from being separated. It features.

The back pressure control valve is characterized in that the press-fit installed in the rear end of the drive shaft.

The oil separator is composed of an oil separator of a cylindrical container type having an opening opposed to a fixed scroll at the bottom of the discharge chamber of the housing, and an oil plate disposed opposite to the oil separator and covering the opening.

A coolant discharge port through which the separated refrigerant gas passes is formed at the bottom of the oil separator, and an oil outlet is formed at a side thereof.

A refrigerant oil inlet is formed between the oil plate and the opening of the oil separator.

The front surface of the oil plate is characterized in that the ring-shaped protrusion projecting toward the inside of the oil separation portion is formed.

A coolant guide tube extending toward the oil plate and communicating with the coolant discharge port is formed at the bottom of the oil container of the cylindrical container type, and the coolant guide tube is spaced apart from the inside of the ring-shaped protrusion. It is characterized by.

The refrigerant oil inlet is characterized in that formed in the tangential direction of the oil separator.

The oil plate may be disposed to face the discharge port formed in the fixed scroll.

On the other hand, the present invention is composed of a housing maintained at the suction pressure, a drive unit for generating a rotational force, a drive shaft rotated by the drive unit, and a scroll wrap to compress the sucked fluid and fixed regardless of the rotation of the drive shaft And a scroll compressor comprising a fixed scroll having a discharge port for supplying a refrigerant to a discharge chamber and a rotating scroll rotating by a drive shaft, and a rotating scroll having a scroll wrap, and supporting the turning scroll in an axial direction. In the scroll compressor comprising a main frame for supporting the rotation,

  A back pressure chamber is formed between the swing scroll and the main frame to closely contact the swing scroll to the fixed scroll side.

  The rear end of the drive shaft is characterized in that the back pressure control valve for maintaining the pressure of the back pressure chamber is formed.

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According to the present invention having the above-described configuration, since the refrigerant is separated into oil and gas through the oil separator, the oil is sent back to the back pressure chamber and the oil is circulated while the back pressure is controlled by the back pressure control valve, so that lubrication and back pressure control are simultaneously performed. There is an advantage to it.

In particular, according to the present invention, durability can be increased through lubrication of a driving part such as a sub bearing.

In addition, according to the present invention, since the back pressure control valve is installed at the rotation center of the drive shaft, the influence on the back pressure control valve can be reduced even when the drive shaft rotates.

In addition, according to the present invention, since the back pressure control valve can be manufactured and assembled as a module, the assembling work can be simplified and the mass productivity can be improved.

Hereinafter, with reference to the accompanying Figures 2 to 7 will be described in detail a preferred embodiment of the present invention.

As shown in Figure 2 and 3, the scroll compressor 1000, the improved oil circulation and back pressure control function according to an embodiment of the present invention, the housing (H), the drive unit for generating a rotational force; Drive shaft 200 which is driven by the drive unit and is rotatably installed via the front main bearing 240 and the rear bearing 730, and the scroll wrap 510 to compress the sucked fluid and Regardless of the rotation of the drive shaft 200 is a scroll compression unit consisting of a fixed scroll 500 and a rotating scroll 400, which is rotated in accordance with the rotation of the drive shaft 200, the spiral scroll wrap 410 is formed; Consists of.

Here, a refrigerant discharge port 681b and a discharge chamber 610 are formed in the front portion of the housing H, and a passage through which the refrigerant passes is formed in the middle portion of the housing H. At the rear portion, the refrigerant suction port 750 and the suction chamber 710 are respectively formed.

However, there are no reasons why the various refrigerant suction ports, suction chambers, refrigerant discharge ports, and discharge chambers are formed as described above, and may be formed at arbitrary positions of the housing according to necessity and convenience.

In the present invention, the housing (H) is composed of the front housing 600 and the main housing 300, but may be divided into three or more housings.

In addition, the housing (H) is provided with a main frame 860 for supporting the drive shaft 200 or the like therein.

In addition, the drive unit includes a stator 210 and a drive motor formed of a rotor 220 positioned inside the stator 210, and a drive shaft 200 that is rotated by being inserted into a center of the drive motor.

In addition, a main bearing 240 and a sub bearing 250 are installed in front of the driving shaft 200 rotated by the driving motor, and the sub bearing 250 is eccentrically installed with respect to the driving shaft 200. Supports a circumference of the acting portion 260.

The return passage 290 is formed in the drive shaft 200 in a longitudinal direction so that oil is returned from the discharge chamber 610 of the front housing 600 to be described later.

In particular, as shown in Figure 5, the back pressure control valve 270 is provided at the rear end of the drive shaft return passage 290. Therefore, when the pressure in the back pressure chamber BAC is large, the back pressure control valve 270 is opened to maintain a constant pressure while the oil is discharged.

The back pressure control valve 270 can be easily assembled and inserted into the drive shaft 200 by preliminary assembly.

In addition, the back pressure control valve 270 is composed of a check valve is configured to open when a predetermined pressure or more is applied. In the drawing, the back pressure control valve 270 is a ball member 271 and a spring 272 for elastically supporting the ball 271 and the blocking member for preventing the separation of the ball 271 and the spring 272. (277), it functions easily as a check valve.

In addition, the back pressure control valve 270 is installed at the center of rotation of the drive shaft 200 can be less affected by the centrifugal force caused by the rotation of the drive shaft 200.

The oil passing through the back pressure regulating valve 270 is lubricated while passing through the rear bearing 730 and then returned to the housing.

The back pressure control valve 270 is press-fitted to the inside of the rear end of the drive shaft 200 by pressing fit, it is good to be configured to only press the inside part.

In addition, the rear bearing 730 may be installed to be slidable with respect to the main housing 600. This is because when the rear bearing 730 is press-fitted with respect to the main housing 300, the outer diameter of the driving shaft 200 is enlarged, and the rear bearing 730 does not move smoothly, and manufacturing is not easy.

2 and 3, the scroll compression unit is fixed to the front housing 600 and has a fixed scroll 500 having a scroll wrap 510 thereon, and the fixed scroll 500. It is composed of a rotating scroll 400, which is combined with the spiral scroll wrap 410 is also formed.

The eccentric action portion 260 installed on the drive shaft 200 is connected to the swinging scroll 400 via the sub bearing 250.

Accordingly, the eccentric action unit 260 rotates eccentrically with respect to the drive shaft 200 by the rotation of the drive shaft 200, and eventually, the orbiting scroll (25) installed on the eccentric action unit 260 via the sub bearing 250. 400 is pivoted relative to the fixed scroll 500.

As described above, pockets are formed between the scroll wraps 410 and 510 according to the turning motion of the turning scroll 400, and the refrigerant is compressed while the volume thereof is continuously changed.

Meanwhile, a bearing 730 is installed between the rear portion of the main housing 300 and the driving shaft 200, and oil returned between the bearing 730 and the bearing mounting surface of the main housing 300 is provided. An axial groove 770 is formed for flow.

Of course, the oil discharged through the axial groove 770 flows into the suction chamber 710. In addition, the introduced refrigerant moves to the scroll compression unit through a plurality of through holes (not shown) formed in the main housing 300.

2, 6, and 7, a discharge chamber 610 is formed inside the front housing 600, and a refrigerant discharge port 681b communicated with the discharge chamber 610 on one side of an outer circumferential surface thereof. Is formed.

The front housing 600 is provided with an oil separator 680 for separating the refrigerant introduced into the discharge chamber 610 into oil and gas.

The oil separator 680 may include a cylindrical container oil separator 681 having an opening 681a facing the fixed scroll 500 at the bottom of the discharge chamber 610 of the front housing 600, and an oil separator. It is composed of an oil plate 682 disposed opposite to 681 and covering the opening 681a.

A coolant discharge port 681b through which the separated refrigerant gas passes is formed at the bottom of the oil separator 681, and an oil outlet 681c is formed at a side thereof.

In addition, a coolant oil inlet 682a is formed between the oil plate 682 and the opening 681a of the oil separator 681. In addition, a ring-shaped protrusion 682b protruding toward the inside of the oil separation unit 681 is formed on the front surface of the oil plate 682. Accordingly, the mist-type refrigerant oil introduced through the refrigerant oil inlet 682a is rotated along the circumference of the protrusion 682b to separate gas-liquids so that the gas refrigerant is discharged through the refrigerant discharge port 681b and the liquid oil is oil. It flows into the back pressure chamber BAC through the return passage 580 which penetrates the fixed scroll 500 in the longitudinal direction through the exit 681c.

In particular, a coolant guide tube 681e extending toward the oil plate 682 and communicating with the coolant discharge port 681b is formed at the bottom of the cylindrical container oil separator 681. The refrigerant guide tube 681e is disposed to be spaced apart from the inside of the ring-shaped protrusion 682b to effectively guide the oil refrigerant introduced through the refrigerant oil inlet 682a to facilitate gas-liquid separation. do.

In addition, the coolant oil inlet 682a is formed in the tangential direction of the oil separator 681 so that the coolant oil smoothly flows between the coolant guide tube 681e and the ring-shaped protrusion 682b.

In addition, the oil plate 682 may be disposed to face the discharge port 560 formed in the fixed scroll 500 so that the discharged refrigerant oil may immediately flow into the oil separator 680 without delay. . In this case, a check valve 630 may be installed in the discharge port 560 to prevent the reverse flow of the discharged refrigerant.

As shown in FIG. 2, an elastic thrust plate 870 is provided between the pivoting scroll 400 and the inner end of the housing middle part 300 to support the pivoting motion of the pivoting scroll 400.

In addition, as shown in FIG. 4, a radial flow groove 360 is formed on the front surface of the main frame 860 facing the thrust plate 870 so that the returning oil naturally flows into the back pressure chamber BAC. Will flow.

Unspecified component 'G' is a gasket.

Hereinafter, the operation of circulating oil in accordance with the above-described configuration will be described.

First, the refrigerant flowing into the suction chamber 710 through the refrigerant inlet 750 formed in the main housing 300 is spiral scroll wraps of the turning scroll 400 and the fixed scroll 500 in a state where oil and refrigerant gas are mixed. It passes between 410 and 510. The refrigerant is compressed while passing through the scroll compression unit, and then flows into the discharge chamber 610 through the discharge port 560 of the fixed scroll 500.

The refrigerant introduced into the discharge chamber 610 is introduced into the oil separator 680 and separated into oil and refrigerant gas by the principle of centrifugation. Among these, the gas is discharged to the apparatus (condenser, etc.) of the next stage through the refrigerant discharge outlet 681b formed in the front housing 600, and the oil moves downward through the oil outlet 681c.

The oil then passes through the return passage 580 formed in the fixed scroll 500 and through the radial grooves 360 formed inside the tip of the main housing 300 opposite the thrust plate 870. The back pressure is formed in the back pressure chamber BAC by moving to the back pressure chamber.

The oil introduced into the back pressure chamber BAC performs lubrication while passing through the sub bearing 250 and continuously flows into the return flow path 290 of the drive shaft 200.

At this time, a back pressure control valve 270 is installed at the rear end of the return flow path 290, that is, at the rear end of the drive shaft 200. When the back pressure is smaller than the reference value, the back pressure control valve 270 is not opened. As it opens, the oil passes through.

The oil passing through the return flow path 290 and the back pressure control valve 270 flows into the suction chamber 710 through an axial groove 770 formed between the bearing 730 inside the rear end of the main housing 300. To return. It is then mixed with the freshly aspirated oil and entered back into the scroll compression section.

1A is a longitudinal sectional view showing an example of a scroll compressor having a conventional back pressure regulating valve function.

1B is a plan view illustrating the back pressure structure in FIG. 1A.

Figure 2a is a longitudinal sectional view showing an embodiment of the scroll compressor with improved oil circulation and back pressure control function according to the present invention.

Figure 2b is a view showing the flow of oil and gas refrigerant in Figure 2a.

3 is an exploded perspective view of FIG. 2A.

4 is a front view of the main frame of FIG. 3.

5 is a detailed cross-sectional view showing the configuration of the back pressure control valve in FIG. 2A.

FIG. 6 is a perspective view illustrating an oil separator of the front housing of FIG. 3. FIG.

FIG. 7 is a longitudinal cross-sectional view showing the configuration of an oil separator in FIG. 6 in detail.

<Description of Major Components>

200 ... drive shaft

270 ... back pressure regulating valve

290 ... drive shaft return path

300 ... main housing

400 ... Turning Scroll

500 ... fixed scroll

560 ... discharge port

600 ... front housing

610 ... discharge chamber

681b ... refrigerant outlet

680 ... oil separator

681.Oil Separator

682 ... oil plate

683.Oil branch

710 ... suction chamber

750 ... refrigerant intake

BAC ... back pressure chamber

H ... housing

Claims (14)

A housing, a drive unit for generating rotational force, a drive shaft installed in the housing via a rear bearing, and driven by the drive unit, and a scroll wrap to compress the sucked fluid, and fixed regardless of the rotation of the drive shaft. A scroll compression unit comprising a fixed scroll having a discharge port for supplying a coolant to a discharge chamber and a rotating scroll which is rotated by rotation of the drive shaft, and a scroll wrap is formed, an eccentric action unit connected between the rotating scroll and the drive shaft; A scroll compressor comprising a main frame supporting the pivoting scroll in an axial direction and supporting the driving shaft in a rotational manner. The refrigerant compressed by the scroll compression unit is sent to the discharge chamber, Refrigerant in the discharge chamber is separated into oil and gas in the oil separator, the gas is discharged through the refrigerant discharge port, the oil is supplied to the back pressure chamber through the return passage formed in the fixed scroll, The oil is a scroll compressor having an improved oil circulation and back pressure control function characterized in that the oil flows back into the housing through a back pressure control valve disposed in the rear end of the drive shaft through the return flow path formed in the drive shaft. The method of claim 1, A thrust plate is interposed between the pivoting scroll and the main frame, and a radial flow groove is formed on a surface of the main frame facing the thrust plate, wherein the oil circulation and back pressure control function is improved. compressor. The method of claim 2, The oil passing through the flow groove is passed through the eccentric action portion, characterized in that the oil circulation and back pressure control function improved scroll compressor. The method of claim 1, The oil passing through the back pressure regulating valve is returned to the housing passing through the rear bearing to the scroll compressor with improved oil circulation and back pressure control function. The method of claim 1, The back pressure control valve is a scroll compressor with improved oil circulation and back pressure control, characterized in that installed in the center of rotation of the drive shaft. The method of claim 1, The back pressure control valve is assembled in advance and modularized, the scroll compressor with improved oil circulation and back pressure control, characterized in that the entire assembly is inserted into the drive shaft separately installed. The method of claim 6, The back pressure control valve includes a valve case, a valve member sliding axially in the valve case, a spring for elastically supporting the valve member, and the valve member and a blocking member for preventing the spring from being separated. Scroll compressor with improved oil circulation and back pressure control. The method of claim 6, The back pressure control valve is a scroll compressor with improved oil circulation and back pressure control, characterized in that the press-in installed in the rear end of the drive shaft. The method of claim 1, The oil separator is composed of an oil separator of a cylindrical container type having an opening opposed to a fixed scroll at the bottom of the discharge chamber of the housing, and an oil plate disposed opposite to the oil separator and covering the opening. At the bottom of the oil separator, a refrigerant outlet through which the separated refrigerant gas passes is formed, and an oil outlet is formed at a side thereof. A refrigerant oil inlet is formed between the oil plate and the opening of the oil separator. The front surface of the oil plate is a scroll compressor, the oil circulation and back pressure control function is improved, characterized in that a ring-shaped projection projecting toward the inside of the oil separation unit is formed. The method of claim 9, A coolant guide tube extending toward the oil plate and communicating with the coolant discharge port is formed at the bottom of the oil container of the cylindrical container type, and the coolant guide tube is spaced apart from the inside of the ring-shaped protrusion. Scroll compressor with improved oil circulation and back pressure control, characterized in that. The method of claim 10, The refrigerant oil inlet is formed in the tangential direction of the oil separation unit, characterized in that the oil circulation and back pressure control function improved scroll compressor. The method of claim 10, And the oil plate is disposed to face the discharge port formed in the fixed scroll. It consists of a housing maintained at suction pressure, a drive unit for generating rotational force, a drive shaft rotated by the drive unit, and a scroll wrap for compressing the sucked fluid, which is fixed regardless of the rotation of the drive shaft and is refrigerant in the discharge chamber. A scroll compression unit comprising a fixed scroll having a discharge port for supplying a rotating port and a rotating scroll which is rotated by a rotation of a driving shaft, and a rotating scroll having a scroll wrap; In the scroll compressor comprising:   A back pressure chamber is formed between the swing scroll and the main frame to closely contact the swing scroll to the fixed scroll side.   And a back pressure control valve is formed at a rear end of the drive shaft to maintain the pressure in the back pressure chamber. delete

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