KR20200095994A - Scroll compressor improved Assembly structure - Google Patents

Abstract

The present invention relates to a scroll compressor having an improved coupling structure, in which a load acting on a main bearing in a high-pressure refrigerant compression environment is reduced to improve durability. The scroll compressor according to the present invention provides: a drive unit which generates a rotational force inside a main housing forming an accommodation space; and a compression unit driven by the drive unit and forming a compression chamber compressing a refrigerant. The rotational force of the drive unit is transmitted to the compression unit by a drive shaft. The drive shaft is rotationally supported by a main bearing, and the main bearing is installed in a region on the side of the drive unit which is the region before the refrigerant is compressed. Therefore, since the main bearing is disposed in a low pressure region, the load applied to the main bearing can be reduced.

Description

Scroll compressor improved assembly structure

The present invention relates to a scroll compressor having an improved coupling structure capable of improving durability by reducing a load acting on a main bearing in a high-pressure refrigerant compression environment.

In general, a compressor refers to a device that compresses a refrigerant. Compressors can be classified into reciprocating type, centrifugal type, vane type, and scroll type.

Among them, a scroll type compressor (hereinafter referred to as a scroll compressor) includes a fixed scroll fixed in an inner space of a closed container, and a rotating scroll engaged with the fixed scroll for orbiting motion. The fixed scroll is provided with a fixed wrap protruding toward the orbiting scroll. The orbiting scroll is provided with an orbiting wrap protruding toward the fixed scroll. The scroll compressor is a compressor in which a compression chamber for compressing a refrigerant is formed between the fixed wrap and the orbiting wrap when the orbiting scroll rotates with respect to the fixed scroll.

The scroll compressor can obtain a relatively high compression ratio compared to other types of compressors. In addition, there is an advantage that a stable torque can be obtained by smoothly continuing the suction, compression, and discharge strokes of the refrigerant. Accordingly, it is widely used for refrigerant compression in various fields.

An example of such a scroll compressor is disclosed in Korean Patent Registration No. 10-0937919 (registration date January 13, 2010) (hereinafter, a drawing number describing a scroll compressor of a prior art is disclosed in a patent document and corresponds only to the description of the prior art. Number).

A conventional scroll compressor includes a driving unit generating rotational force and a scroll compression unit compressing a refrigerant.

The driving unit includes a driving motor including a stator 210 and a rotor 220 in the housing H, and a driving shaft 200 that is inserted into the center of the driving motor and rotates. A main bearing 240 and a sub bearing 250 are installed on one side of the drive shaft 200, and a rear bearing 730 is installed on the other side to rotatably support the drive shaft 200. The main bearing 240 is inserted into the main frame 860.

The scroll compression unit includes an orbiting scroll 400 and a fixed scroll 500. A fixed scroll 500 having a scroll wrap 510 for compressing a refrigerant is coupled to the main frame 860. The fixed scroll 500 is coupled to the scroll wrap 510 and the orbiting scroll 400 on which the scroll wrap 410 for compressing the refrigerant is formed is coupled. The orbiting scroll 400 is rotated by the drive shaft 200 but rotates and compresses the refrigerant.

A back pressure chamber (BAC) is formed between the orbiting scroll 400 and the main frame 860 so that the orbiting scroll 400 is in close contact with the fixed scroll 500.

A discharge chamber 610 through which the compressed refrigerant is discharged is provided at the front side of the housing H, and a suction chamber 710 through which the refrigerant is sucked is formed at the rear side of the housing H. The refrigerant sucked into the suction chamber 710 is compressed through a driving unit and a scroll compression unit and then discharged to the discharge chamber 610. When the pressure inside the housing H is relatively compared, the pressure in the suction chamber 710 is the lowest, the pressure in the discharge chamber 610 is the highest, and the pressure in the back pressure chamber BAC achieves a medium pressure.

The above-described conventional scroll compressor has a structure applied to an air conditioning system of a vehicle, and is a compressor mainly using refrigerant R134a or R1234yf (a type of chemical refrigerant). These chemical refrigerants are refrigerants in which the internal pressure of the scroll compressor is low in the range of 2 bar to 30 bar. In the case of a scroll compressor using a low-pressure refrigerant, the pressure applied to the main bearing is not high even if the main bearing is located on the back pressure chamber side as in the preceding patent. Therefore, it is possible to satisfy the durability life of bearings required by industrial standards.

However, in recent years, the demand for natural refrigerants or environmentally friendly refrigerants is increasing due to a change in perception of environmental pollution, and various regulations on exhaust gas have been introduced. In accordance with this trend, interest in eco-friendly refrigerants using carbon dioxide as a vehicle refrigerant is increasing.

In the case of carbon dioxide, it is used in an environment where the minimum pressure when flowing into the scroll compressor increases from about 35 bar to the maximum operating pressure to 130 bar. Therefore, parts such as main bearings are exposed to a much higher pressure environment than in the past, which used a low-pressure refrigerant. Accordingly, there is a problem that the life of the main bearing is greatly shortened as the load acting on the main bearing increases.

Therefore, since it is difficult to meet the required durability life required by industrial standards, it is necessary to increase the durability of the main bearing by increasing the size of the main bearing or by special treatment. However, there is a problem that it is not easy to increase the size of the main bearing due to interference with the periphery. In addition, there is a problem that manufacturing costs increase when special treatment is applied to the main bearing.

In order to increase the durability life of the main bearing, the temperature of the periphery must be lowered. However, since the main bearing is disposed in the intermediate pressure chamber, it is difficult to apply a temperature reduction method such as cooling structurally.

An object of the present invention is to provide a scroll compressor having an improved coupling structure capable of improving durability by reducing a load acting on a main bearing in a high-pressure refrigerant compression environment.

In addition, an object of the present invention is to provide a scroll compressor having an improved coupling structure capable of improving durability by increasing the size of the main bearing by improving the coupling structure of the main bearing.

In addition, an object of the present invention is to provide a scroll compressor having an improved coupling structure capable of improving durability by reducing the temperature of the peripheral portion of the main bearing.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention that are not mentioned may be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be readily appreciated that the objects and advantages of the present invention can be realized by means of the appended claims and combinations thereof.

The scroll compressor according to the present invention provides a driving unit for generating a rotational force in a main housing defining an accommodation space, and a compression unit for forming a compression chamber that is driven by the driving unit to compress a refrigerant. The rotational force of the drive unit is transmitted to the compression unit by the drive shaft. The drive shaft is rotatably supported by the main bearing, and the main bearing is installed in a region on the side of the driving unit that is a region before the refrigerant is compressed. Therefore, since the main bearing is disposed in the low pressure region, the load applied to the main bearing can be reduced.

Further, in the scroll compressor according to the present invention, a main bearing rotatably supporting a drive shaft is disposed in a low pressure region having a relatively large space compared to the intermediate pressure chamber region. Therefore, by increasing the size of the main bearing, it is possible to provide a main bearing with high durability even under a high pressure environment.

Further, in the scroll compressor according to the present invention, a main bearing rotatably supporting a drive shaft is disposed in a region in which a driving unit is mounted, which is a region before the refrigerant is introduced and compressed. Therefore, compared to the case where the main bearing is disposed in the intermediate pressure chamber, the temperature of the main bearing and the peripheral portion is lowered, so that the durability life of the main bearing can be increased.

The scroll compressor according to the present invention has an effect of reducing the load of the main bearing and improving durability since the main bearing can operate in a low pressure environment by moving the installation position of the main bearing to a low pressure portion.

Further, in the scroll compressor according to the present invention, since the installation space of the main bearing is moved to a low pressure portion, the installation space is relatively wide, so that the size of the main bearing can be increased, thereby improving the durability of the main bearing itself.

Further, in the scroll compressor according to the present invention, since the main bearing is operated under a relatively low temperature by moving the installation position of the main bearing to a low pressure portion, there is an effect of improving the durability of the main bearing according to a decrease in temperature.

In addition to the above-described effects, the concrete effects of the present invention will be described together while describing the specific matters for carrying out the invention.

1 is an exploded perspective view showing a scroll compressor according to an embodiment of the present invention.
2 is a cross-sectional view showing a scroll compressor according to FIG. 1.
3 is an enlarged cross-sectional view illustrating an installation state of the main bearing according to FIG. 2.
4 is a schematic diagram showing the main bearing and sealing positions of a conventional scroll compressor.
5 is a schematic diagram showing the main bearing and sealing positions of the scroll compressor of the present invention.

The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, and accordingly, a person skilled in the art to which the present invention pertains can easily implement the technical spirit of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

In the following, the arrangement of any component in the "upper (or lower)" of the component or the "upper (or lower)" of the component means that any component is disposed in contact with the upper surface (or lower surface) of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

In addition, when a component is described as being "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that "or, each component may be "connected", "coupled" or "connected" through other components.

1 is an exploded perspective view showing a scroll compressor according to an embodiment of the present invention. 2 is a cross-sectional view showing a scroll compressor according to FIG. 1. 3 is an enlarged cross-sectional view illustrating an installation state of the main bearing according to FIG. 2.

1 and 2, the scroll compressor 10 according to an embodiment of the present invention is coupled to the main housing 110 forming an accommodation space and the front and rear sides of the main housing 110 to accommodate It includes a front head 130 and a rear head 150 covering the space. An inverter assembly 170 is coupled to the front of the front head 130. The driving unit 300 and the compression unit 500 are accommodated in the accommodation space (hereinafter, the front head direction is defined as the front and the rear head direction as the rear. Therefore, the front head direction of all components is the front, and the rear head direction is the rear side. do).

The main housing 110 forms a substantially cylindrical appearance. In addition, the main housing 110 has a shape in which both ends in the longitudinal direction are open. The front head 130 and the rear head 150 are coupled to both open ends. The front head 130 and the rear head 150 have a substantially disk shape corresponding to the end shape of the main housing 110.

A refrigerant suction port (not shown) and a refrigerant suction chamber (not shown) for sucking refrigerant are formed on one front side of the main housing 110. A refrigerant discharge port 112 and a refrigerant discharge chamber 114 for discharging the refrigerant compressed by the compression unit 500 are formed between the rear of the main housing 110 and the rear head 150. A reservoir 152 is formed in the rear head 150. An oil separator 154 is installed on the reservoir 152 to separate oil from the discharged refrigerant.

The low-temperature, low-pressure refrigerant introduced into the refrigerant inlet passes through the refrigerant suction chamber and moves from the front to the rear inside the main housing, cools the driving unit 300 and flows into the compression unit 500. The refrigerant introduced into the compression unit 500 is compressed and discharged to the refrigerant discharge chamber 114 through the refrigerant discharge port 112 in a high-temperature and high-pressure state. The discharged refrigerant is discharged to the outside of the rear head 150 after the oil is separated by the oil separator 154. The oil separated by the oil separator 154 is supplied from the oil reservoir 152 to the intermediate pressure chamber MR, which will be described later, through the oil flow path P. Oil supplied to the intermediate pressure chamber MR lubricates each portion of the compression unit 500.

In the scroll compressor 100 of the present invention having the above-described configuration, the driving unit 300 and the compression unit 500 will be described in detail.

As shown in FIGS. 1 to 3, the driving unit 300 includes a driving motor 310 generating rotational force and a driving shaft 330 rotating by the driving motor 310.

The driving motor 310 includes a stator 312 installed in the main housing 110 and fixed, and a rotor 314 inserted into and rotated inside the stator 312. The stator 312 may be formed in a cylindrical shape. The stator 312 is provided with a plurality of slots in which a coil is wound. The rotor 314 is rotated by the electromotive force of a magnetic field generated in the stator 312. The drive shaft 330 is inserted through the inside of the rotor 314. The drive shaft 330 is rotated by the rotation of the rotor 314.

One end of the drive shaft 330 is fixed to the rotor 314 and the other end extends toward the compression part 500. The front of the drive shaft 330 is rotatably supported by the front bearing 350. The rear of the drive shaft 330 is rotatably supported by the main bearing 370.

The front bearing 350 is coupled to the front head 130 to support the drive shaft 330 so as to be rotatable. The main bearing 370 is coupled to the outside of the main housing 110 of the compression unit 500 to be described later to support the drive shaft 330 so as to be rotatable (the main bearing will be described later).

The compression unit 500 restricts rotation of the fixed scroll 510 fixed to the main housing 110, the orbiting scroll 520 coupled to the fixed scroll 510 so as to be capable of orbiting movement, and the orbiting scroll 520 It includes a plurality of pins 530 and rings 540, an eccentric bush 550 for rotating the orbiting scroll 520, and a sub-bearing 540 rotatably supporting the eccentric bush 550. . In addition, the compression unit 500 further includes a main frame 580 coupled between the orbiting scroll 520 and the driving unit 300 to support the driving shaft 330.

The fixed scroll 510 is disposed toward the rear head 150 so that the rear surface is coupled to the rear head 150. The fixed scroll 510 has a cylindrical shape with an open direction toward the front head 130. The fixed scroll 510 includes a fixed wrap 512 protruding therein in a direction toward the front head 130.

The fixed wrap 512 is formed to protrude from the front surface of the fixed scroll 510 in a spiral shape. The fixed wrap 512 is a part that is combined with the orbiting scroll 520 to form a compression chamber CR and compress the refrigerant. The orbiting wrap 522 of the orbiting scroll 520 to be described later is engaged and coupled to the fixed wrap 512.

The orbiting scroll 520 has a size smaller than that of the fixed scroll 510 and is coupled to the fixed scroll 510. The orbiting scroll 520 is inserted into the open interior of the fixed scroll 510 and is coupled to the fixed scroll 510. The orbiting scroll 520 is in the shape of a disk having a predetermined thickness. The orbiting scroll 520 includes an orbiting wrap 522 protruding from a rear surface facing the fixed wrap 512. A bearing coupling portion 524 to which the sub bearing 540 is coupled is protruded on the front surface of the orbiting scroll 520. In addition, a plurality of pin-and-ring grooves 526 into which the pins 530 and the rings 540 are inserted are formed on the front surface of the orbiting scroll 520.

The orbiting wrap 522 is formed to protrude from the rear surface of the orbiting scroll 520 in a spiral shape. The revolving wrap 522 is a part that is combined with the fixed wrap 512 to form a compression chamber CR and compress the refrigerant. The fixed wrap 512 is engaged and coupled to the orbiting wrap 522. A compression chamber CR is formed between the fixed wrap 512 and the orbiting wrap 522.

The bearing coupling part 524 is protruding from the center of the front surface of the orbiting scroll 520. The bearing coupling part 524 protrudes in a cylindrical shape so that the sub bearing 540 can be inserted. The sub bearing 540 is inserted and supported in the bearing coupling part 524. The sub-bearing 540 has a hollow, and an eccentric bush 550 is inserted into the hollow to be rotatably supported.

A plurality of pin and ring grooves 526 are disposed along the circumferential direction on the front surface of the orbiting scroll 520. A plurality of rings 540 are respectively inserted into the pin and ring grooves 526. Cylindrical pins 530 are inserted into each ring 540, respectively. Each pin 530 is coupled to the main frame 580 to limit the movement of the ring 540.

The eccentric bush 550 is inserted in front of the orbiting scroll 520 and is rotatably supported by the sub bearing 540. The eccentric bush 550 has a cylindrical shape in which a fan-shaped weight 552 is connected to one side. Therefore, the eccentric bush 550 has an eccentric rotational weight. The eccentric bush 550 is coupled such that the drive shaft 330 is coupled to the central portion, and the outer peripheral surface is in contact with the inner peripheral surface of the sub-bearing 540. The eccentric bush 550 rotates together when the drive shaft 330 rotates. When the eccentric bush 550 rotates, the center of gravity is rotated toward the weight 552 in an eccentric state. The eccentric bush 550 is provided, and rotation of the orbiting scroll 520 is prevented by the pins 530 and the ring 540, so that the orbiting scroll 520 orbits with respect to the fixed scroll 510.

The main frame 580 is disposed in front of the orbiting scroll 520 and is coupled to the inner circumferential surface of the main housing 110. To this end, the main frame 580 has a disk-shaped disk portion 582 having an outer diameter corresponding to the inner diameter of the main housing 110 in the orbiting scroll 520 direction. The pin 530 described above is fixed to the rear surface of the disk portion 582. The center of the disk portion 582 is a portion through which the driving shaft 330 is inserted. In addition, the disk portion 582 should not interfere with the eccentric bush 550 when the eccentric bush 550 rotates. Therefore, the center portion of the disk portion 582 must be formed with a space that does not interfere with the rotation of the eccentric bush 550. The eccentric bush 550 rotates within the space thus formed, and the refrigerant passing through the driving unit 300 flows into the space. This space is defined as an intermediate pressure chamber (MR).

The intermediate pressure chamber MR is a space in which a refrigerant that has passed through the driving unit 300 is introduced to form a pressure.

The refrigerant introduced into the main housing 110 is in a low temperature and low pressure state. When the refrigerant passes through the driving unit 300 and cools the driving unit 300, it is heated to increase the temperature and pressure. In this state, the refrigerant flowing into the intermediate pressure chamber MR is in a medium temperature and medium pressure state. When the medium temperature and medium pressure refrigerant is compressed in the compression chamber CR, it becomes a high temperature and high pressure state and is discharged to the refrigerant discharge chamber 114. In addition, the orbiting scroll 520 is in close contact with the fixed scroll 510 by the pressure formed in the intermediate pressure chamber MR, so that the refrigerant can be compressed.

Here, low temperature, medium temperature, high temperature and low pressure, medium pressure, and high pressure are relative concepts, and the temperature and pressure distribution in the scroll compressor 100 are relatively classified into low, medium, and high.

In the scroll compressor 100 of the present invention, the portion where the driving unit 300 is located is a low pressure region, an intermediate pressure region between the main frame 580 and the orbiting scroll 520, and the orbiting scroll 520 and the rear head 150 The space between them can be seen as a high-pressure area.

In addition, the drive shaft 330 penetrates through the main frame 580. The main bearing 370 supporting the drive shaft 330 is coupled to the main frame 580. The portion to which the main bearing 370 is coupled is formed to protrude in a cylindrical shape from the front surface of the disk portion 582 toward the front head 130. The protruding portion is defined as the bearing receiving portion 584. The bearing accommodating portion 584 is separated from the intermediate pressure chamber MR by a sealing member 570. Therefore, the bearing receiving portion 584 is located in the low pressure region.

The sealing member 570 is mounted on the inner side of the main frame 580 adjacent to the orbiting scroll 520 than the position at which the main bearing 370 is mounted. For example, the sealing member 570 may be composed of a shaft seal and a snap ring. A groove 588 (refer to FIG. 5) may be formed inside the main frame 580 so that the sealing member 570 may be mounted. The groove 586 is formed to have a size smaller than the seating groove 584a in which the main bearing 370 is seated.

The bearing accommodating portion 584 has a cylindrical shape, and a hollow is formed in the center so that the drive shaft 330 is inserted therethrough. By processing the inner circumferential surface concave based on the hollow, the seating groove 584a on which the main bearing 370 is seated is processed. Since the drive shaft 330 penetrates while the main bearing 370 is inserted into the seating groove 584a in the bearing receiving part 584, the drive shaft 330 is rotatably supported by the main bearing 370.

Meanwhile, as shown in FIG. 3, the main bearing 370 is disposed adjacent to the driving unit 300 which is a low pressure region. The main bearing 370 rotatably supports the drive shaft 330.

As regulations for reducing air pollutants are gradually strengthened, carbon dioxide is attracting attention as an eco-friendly refrigerant to replace chemical refrigerants such as R134a or R1234yf. In the case of chemical refrigerants, it is used at a pressure of 2 to 30 bar inside the compressor.

However, the carbon dioxide refrigerant (R744 refrigerant) requires a high-pressure operating environment to maintain a stable refrigerant state. In general, carbon dioxide refrigerant is used at a pressure of 35 to 130 bar inside the compressor. In a general scroll compressor, the suction pressure of the refrigerant is about 30 bar, and the driving part, which is a low pressure region, has an internal pressure of about 35 bar. The pressure in the medium pressure chamber is about 70-80 bar, and the temperature is about 100 degrees Celsius. The regions of the compression chamber CR and the refrigerant discharge chamber 114, which are high-pressure regions, exhibit an internal pressure of up to 130 bar.

Compressors applied to automobiles must satisfy the'required durability life' condition required for each part. In order to satisfy the required durability life of the main bearing 370, the durability of the main bearing 370 itself may be strengthened or the load acting on the main bearing 370 may be reduced.

As a method of enhancing the durability of the main bearing 370, there is a method of increasing the size of the main bearing 370 or applying a special treatment such as heat treatment. Alternatively, the main bearing 370 may be made of a special material to enhance durability.

However, since this method increases the manufacturing cost, the main bearing 370 is generally made of steel. The steel material is sensitive to temperature, and when the temperature around the main bearing 370 is high, the durability life is shortened.

In addition, it is difficult to increase the size of the main bearing 370 at will because it must satisfy design requirements such as interference with peripheral parts and size limitation of the compressor.

A method of reducing the load acting on the main bearing 370 may indirectly reduce the load of the main bearing 370 by reducing the load acting on the main bearing 370 itself or reducing the surrounding temperature. When the temperature of the main bearing 370 is high, the durability life is shortened, and thus the temperature of the main bearing 370 can be decreased to increase the durability life.

To this end, the present invention may reduce the pressure and temperature applied to the main bearing 370 by arranging the main bearing 370 in a low temperature low pressure region as described above. Referring to the prior patent, in the related art, the main bearing 240 is disposed in a back pressure chamber (BAC) which is a medium pressure region. Therefore, when the same structure is applied to a compressor using a carbon dioxide refrigerant, the required durability life of the main bearing 240 cannot be satisfied.

However, as in the present invention, since the main bearing 370 is disposed in a low-temperature, low-pressure region, the temperature of the main bearing 370 and the peripheral portion is reduced, thereby increasing the durability life. In addition, since the main bearing 370 is not disposed in the intermediate pressure chamber MR in the main frame 580 and is disposed toward the driving unit 300 with a relatively large space, the size of the main bearing 370 is increased to increase the durability life. Can be increased.

For example, based on the German industrial standard DIN standard, the main bearing 370 must be able to meet the required durability life of 700 hours.

As a result of modeling for predicting the durability life of the main bearing 370, when the temperature around the main bearing 370 is 100 degrees Celsius, the durability life of the main bearing 370 is only about 270 hours. However, when the temperature around the main bearing 370 is lowered, the durability life of the main bearing 370 is increased by about 60 hours as the ambient temperature is decreased by 10 degrees Celsius. Therefore, in order to meet the DIN standard, the temperature around the main bearing 370 must be lowered to 30 degrees Celsius or less.

Also, increasing the diameter of the main bearing 370 by about 5 pi may increase the durability life. For example, when the diameter of the main bearing 370 is increased from 47 pi to 52 pi, the durability life of the main bearing 370 may be increased more than twice from 270 hours to 611 hours under a temperature condition of 100 degrees Celsius.

Therefore, if the size of the main bearing 370 is increased and the temperature of the peripheral part is decreased, the DIN standard can be satisfied. For example, if the size of the main bearing 370 is increased by 5 pi and the temperature at the periphery is decreased by 20 degrees, the durability life of the main bearing 370 is increased to 720 hours or more, thereby satisfying the required durability life required by the DIN standard. I can. Here, when the temperature of the peripheral portion of the main bearing 370 is lowered, the durability life of the main bearing 370 is greatly increased, and thus, the required service life may be greater than that required by the DIN standard. In the structure of the scroll compressor 100 of the present invention, the low pressure region in which the main compressor 100 is disposed has a temperature of about 25 to 30 degrees Celsius.

In the above-described embodiment, the position of the main bearing 370 has an advantage compared to the prior art in terms of workability of the scroll compressor 100.

4 is a schematic diagram showing the main bearing and sealing positions of a conventional scroll compressor. 5 is a schematic diagram showing the main bearing and sealing positions of the scroll compressor of the present invention.

As shown in FIG. 4, in the conventional scroll compressor 100', the main bearing 370' is arranged in the main frame 580'. The shaft seal 570' is inserted on the main frame 580' spaced apart from the main bearing 370'. The shaft seal 570' prevents the refrigerant flowing into the intermediate pressure chamber MR' in which the main bearing 370' is installed from flowing back to the low pressure region where the driving unit 300' is located. Therefore, the shaft seal 570' is disposed closer to the driving part 300' than the main bearing 370'.

A seating groove 584a' corresponding to the size and shape of the main bearing 370' should be formed in the portion into which the main bearing 370' is inserted. However, since the main bearing 370 ′ is larger in size than the shaft seal 570 ′, it is not easy to process the mounting groove 584a ′ inside the shaft seal 570 ′, thereby increasing the tolerance.

In addition, since the main frame 580' is made of aluminum and the main bearing 370' is made of steel, the expansion rate due to heat is different. Since the main frame 580' has greater thermal expansion than the main bearing 370', if the tolerance of the seating groove 584a' is larger than the allowable size, the main bearing 370 may escape from the seating groove 584a' at high temperature. I can. Therefore, the main bearing 370 was additionally required for stacking or cogging so that the main bearing 370 does not deviate from the seating groove 584a.

However, as shown in FIG. 5, by moving the main bearing 370 to the end of the main frame 580 so as to be adjacent to the driving unit 300, and moving the sealing member 570 inward than the main bearing 370 It is possible to solve the above problems.

That is, if the groove 586 for the sealing member 570 is first processed inside the main frame 580, and the seating groove 584a for the main bearing 370 is processed on the main frame 580, the workability Improves. The groove 586 is a very small groove compared to the seating groove 584a, so even if it is located inside the main frame 580, it can be easily processed. After that, processing the seating groove 584a at the end side of the main frame 580 enables easy processing.

In addition, since the main bearing 370 is disposed in a low-temperature, low-pressure region other than the intermediate pressure chamber MR, the main housing 110 expands and the main bearing 370 is not separated from the seating groove 584a. Therefore, since additional processing such as stacking or cogging is unnecessary, the manufacturing process is shortened and additional costs are reduced.

In the above-described embodiment, a structure in which the main frame is formed separately from the main housing to support the orbiting scroll has been described. However, the main bearing installation structure of the present invention can be equally applied to a scroll compressor in which a main frame and a main housing are integrally formed.

As described above, the present invention has been described with reference to the exemplified drawings, but the present invention is not limited by the examples and drawings disclosed in the present specification, and can be varied by a person skilled in the art within the scope of the technical idea of the present invention. It is obvious that modifications can be made. In addition, although the operation and effect according to the configuration of the present invention has not been explicitly described while explaining the embodiment of the present invention, it is natural that the predictable effect should also be recognized by the configuration.

100: scroll compressor 110: main housing
130: front head 150: rear head
300: drive unit 310: drive motor
330: drive shaft 370: main bearing
500: compression unit 510: fixed scroll
520: orbiting scroll 530: pin
540: ring 550: eccentric bush
560: sub bearing 570: sealing member
580: main frame 584a: mounting groove
586: groove

Claims (11)

A main housing that forms an accommodation space and into which a low-temperature, low-pressure refrigerant flows into one side;
A driving unit mounted on an inner side of the main housing, mounted in a low-pressure region, and including a driving motor generating rotational force, and a driving shaft coupled to the driving motor to rotate; And
A fixed scroll mounted on the other side of the inside of the main housing, a rotating scroll coupled to the drive shaft and rotating, and coupled to the fixed scroll to form a high-pressure compression chamber for compressing the refrigerant, and the drive shaft is inserted through the Includes; a compression unit having a main frame separating the accommodation space in which the driving unit is mounted and the accommodation space in which the fixed scroll and orbiting scroll are mounted,
The driving unit
The drive shaft is rotatably supported, but further comprising a main bearing disposed in the low pressure region
Scroll compressor.
The method of claim 1,
The compression unit
It is mounted on the main frame further comprising a sealing member for sealing between the drive shaft and the main frame
Scroll compressor.
According to claim 2,
The main bearing is
It is mounted on the main frame and mounted on the outside of the sealing member adjacent to the driving unit
Scroll compressor.
The method of claim 3,
The main frame is
The seating groove into which the main bearing is inserted is formed concave on the inner circumferential surface
Scroll compressor.
The method of claim 1,
The main frame is
Formed integrally with the main housing
Scroll compressor.
The method of claim 1,
The refrigerant is a carbon dioxide refrigerant, characterized in that
Scroll compressor.
A main housing forming an accommodation space;
A front head and a rear head respectively coupled to the front and rear of the main housing to cover the accommodation space;
A driving unit mounted on an inner side of the main housing and including a driving motor generating rotational force, and a driving shaft coupled to the driving motor and rotating; And
A fixed scroll mounted on the other side of the main housing and having a fixed wrap protruding toward the driving part, and a rotating scroll coupled to the drive shaft and rotating and engaged with the fixed wrap to form a compression chamber for compressing a refrigerant; , A compression unit provided between the orbiting scroll and the driving unit and including a main frame through which the driving shaft is inserted and supporting the driving shaft, and a main bearing mounted at one end of the main frame to rotatably support the driving shaft Including ;,
The compression unit
A sealing member coupled to the main frame, disposed adjacent to the orbiting scroll, and sealing between the drive shaft and the main frame.
Scroll compressor.
The method of claim 7,
The compression unit
And an intermediate pressure chamber formed between the orbiting scroll and the sealing member into which the refrigerant flows, wherein a pressure of the refrigerant in the intermediate pressure chamber is greater than a pressure of a region in which the main bearing is installed.
Scroll compressor.
The method of claim 7,
The main frame is
The seating groove into which the main bearing is inserted is formed concave on the inner circumferential surface
Scroll compressor.
The method of claim 7,
The main frame is
Formed integrally with the main housing
Scroll compressor.
The method of claim 7,
The refrigerant is a carbon dioxide refrigerant, characterized in that
Scroll compressor.

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