KR20200109621A - Scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor in which a fixed scroll with the outer wall removed in order to increase a compression capacity of a refrigerant is disposed. In the scroll compressor, a pressure-reducing bridge means connecting the fixed scroll and a center head is disposed in order to constitute an oil recovery unit connecting an oil separation unit of a discharge chamber, a suction chamber flow path, and a back pressure chamber flow path. The scroll compressor comprises a casing, a driving unit, a center head, the discharge chamber, a rotary scroll, the fixed scroll, the back pressure chamber, and the bridge means.

Description

Scroll compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor, and more particularly, in a scroll compressor having a fixed scroll with an outer wall removed to increase a compression capacity of a refrigerant, an oil separation unit of a discharge chamber, a suction chamber flow passage, and a back pressure chamber flow passage are connected. It relates to a scroll compressor in which a pressure-reducing bridge means connecting a fixed scroll and a center head is disposed to constitute an oil recovery unit.

In general, an air conditioning device (Air Conditioning (A/C)) for cooling and heating indoors is installed in automobiles. Such an air conditioner includes a compressor that compresses a low-temperature, low-pressure gaseous refrigerant introduced from an evaporator into a high-temperature, high-pressure gaseous refrigerant and sends it to a condenser.

There are two types of compressors: a reciprocating type for compressing a refrigerant according to a reciprocating motion of a piston, and a rotary type for performing compression while performing a rotary motion. The reciprocating type includes a crank type that transmits to a plurality of pistons using a crank according to the transmission method of the driving source, and a swash plate type that transmits to a rotating shaft with a swash plate.The rotary type includes a vane rotary type that uses a rotating rotary shaft and vanes, There are two types of scroll type using orbiting scroll and fixed scroll.

Scroll compressors are widely used for refrigerant compression in air conditioners because they can obtain a relatively high compression ratio compared to other types of compressors, and smoothly connect refrigerant suction, compression, and discharge strokes to obtain stable torque.

In the case of a scroll compressor, the refrigerant is compressed through the interaction between the orbiting scroll and the fixed scroll. At this time, the orbiting scroll is connected to an eccentric bush disposed at an end of the driving shaft connected to the motor, and a compression region with the fixed scroll is formed by the rotational force transmitted by the eccentric bush according to the rotation of the driving shaft.

Such a scroll compressor may be implemented as an electric type, and in this case, it may belong to a classification of an electric compressor.

In the case of an electric compressor, a motor is driven to rotate the orbiting scroll. The motor generates rotational force through electromagnetic interaction between the stator and the rotor, thereby rotating the drive shaft connected to the rotor.

1 is a side cross-sectional view of an example of the scroll compressor 1 is posted. Referring to Figure 1, when the refrigerant flows from the suction chamber (D) to the compression chamber (C), the shaft (2a) and the eccentric bush (2c) connected by a pin rotates, and accordingly, the eccentric bush (2c) and the rotation connected. The scroll 3a is also rotated. The refrigerant in the compression chamber (C) is compressed by a mutual compression action between the orbiting scroll (3a) and the fixed scroll (3b), and flows into the discharge chamber (4) through the discharge hole (3c).

At this time, the refrigerant introduced into the discharge chamber 4 contains oil because it has been passed through the suction chamber D in which a motor (not shown) is disposed.

In a conventional scroll compressor, an oil recovery part 5 formed on one side of the discharge chamber 4 is connected to a hole formed in the outermost wall of the fixed scroll 3b, and a refrigerant containing oil moves along the hole, at least one It is depressurized through the above orifice, and the oil is returned to the suction chamber.

In recent years, in the industry, efforts to increase the compression capacity of the scroll compressor have been continued. For this, a method of increasing the axial length of the orbiting scroll and the fixed scroll in the axial direction, and a method of increasing the size of the orbiting scroll and the fixed scroll in the radial direction are considered.

However, when the length in the axial direction is increased, there is a problem that durability becomes weak. Therefore, a method of expanding the size in the radial direction has been discussed, and as an example, a method of increasing the compression capacity by expanding the radius of rotation of the orbiting scroll by removing the outermost wall of the fixed scroll is considered.

However, in this case, based on the fixed scroll (3b) posted in FIG. 1, there is no outer wall area on the fixed scroll (3) where the oil return passage is to be processed as the outermost wall of the fixed scroll is removed, so the oil separation unit (5) A problem occurs in connecting the back pressure chamber (B) and the suction chamber (D).

Domestic Patent Publication No.:10-2016-0108037

The present invention has been conceived to solve the problems in the related art as described above, and an object of the present invention is to provide a scroll compressor having a fixed scroll with an outer wall removed to increase the compression capacity of a refrigerant. It is to provide a scroll compressor in which a pressure-reducing bridge means connecting a fixed scroll and a center head is disposed to constitute an oil recovery part connecting the part to the suction chamber flow path and the back pressure chamber flow path.

The present invention for achieving the above objects relates to a scroll compressor, the casing; A driving unit disposed in the driving unit receiving space formed inside the casing and rotating the driving shaft; A center head through which the driving shaft is disposed and connected to the casing; A discharge chamber formed on one side of the casing and through which a refrigerant is discharged; A orbiting stroller connected to the drive shaft; A fixed scroll fixed inside the casing, forming a compression chamber for compressing a refrigerant by interworking with the orbiting scroll, and having a first oil return passage connected to the oil separation portion of the discharge chamber; A back pressure chamber formed between the center head and the orbiting scroll; And a bridge means arranged to connect the first oil return passage and the center head to recover oil by depressurizing the refrigerant.

In addition, in an embodiment of the present invention, a second oil return passage connected to the suction chamber may be formed in the center head, and the bridge means may be configured to be connected to the second oil return passage.

In addition, in the embodiment of the present invention, a branch point may be formed between the bridge means and the second oil return passage through which a back pressure chamber passage connected to the back pressure chamber is connected.

In addition, in an embodiment of the present invention, a decompression orifice for depressurizing a refrigerant and recovering oil may be disposed in the second oil return passage.

In addition, in an embodiment of the present invention, the fixed scroll includes: a fixed plate portion having a discharge port disposed at a central side and an elongated portion protruding in a radial direction along an outer circumference; And a fixed wrap protruding from the fixed plate portion in the orbiting scroll direction, wherein the extension portion is inserted and fixed to a stepped portion formed along the inner circumference of the casing, and the outer circumference of the fixed wrap is open, The first oil recovery passage is formed on the outside of the fixed wrap on the fixed plate part, and may be configured to be in direct communication with the suction chamber by the bridge means.

In addition, in an embodiment of the present invention, the bridge means includes: a bridge pipe that is press-fitted and fixed to the first oil return passage and the center head; An orifice tube disposed inside the bridge tube; And a fixing block disposed inside the bridge pipe and fixing the orifice pipe.

In addition, in an embodiment of the present invention, the bridge means includes: a sealing seat formed to be recessed in an inward direction around an outer circumference of the fixed block; And a sealing member disposed on the sealing seat.

In addition, in an embodiment of the present invention, an insertion groove formed in an orifice hole through which the refrigerant passes through the center of the orifice tube, and an insertion groove formed to be recessed in an inward direction may be disposed around an outer circumference of the orifice tube.

In addition, in an embodiment of the present invention, a protrusion to be fitted into the insertion groove may be formed around the inner circumference of the fixing block.

In addition, in an embodiment of the present invention, in order to secure a space of the sealing seat on the fixed block, the sealing seat may be disposed outside a position corresponding to the protrusion.

In addition, in an embodiment of the present invention, the bridge pipe is in the direction from the first oil return passage to the center head so that the orifice pipe and the fixing block are not separated by a pressure difference between the pressure of the discharge chamber and the pressure of the back pressure chamber. An inner diameter reducing portion of which the inner diameter is gradually decreased may be formed.

In addition, in the embodiment of the present invention, the bridge pipe may be press-fit and fixed relatively deeply to the first oil return passage side rather than the center head side so as not to be separated by a differential pressure between the pressure of the discharge chamber and the pressure of the back pressure chamber. have.

In addition, in an embodiment of the present invention, the bridge means may include an extension part extending from the fixed block in the direction of the first oil recovery passage; And a screen mesh disposed on the extension part.

In addition, in an embodiment of the present invention, the extension portion includes a pair of extension bars supporting both sides of the orifice pipe in the longitudinal direction and extending in the direction of the first oil recovery passage; And an end block connecting ends of the pair of extension bars, wherein the screen mesh may be disposed in a partition formed by the fixed block, the end block, and the pair of extension bars.

In addition, in an embodiment of the present invention, the extension part may further include a support bar formed on a side facing each other of the pair of extension bars and fixing an end of the orifice tube.

The present invention constitutes an oil recovery part connecting the oil separation part of the discharge chamber and the suction chamber flow path and the back pressure chamber flow path by arranging a bridge pipe between the center head and the fixed scroll with the outer wall removed to increase the compression capacity of the refrigerant, The refrigerant containing oil can flow stably into the suction chamber and back pressure chamber.

At this time, a pressure type orifice tube was placed inside the bridge tube so that the refrigerant was depressurized and supplied to the back pressure chamber. In addition, by making the fixed scroll side more deeply and firmly press-fitting, the bridge pipe was prevented from being separated due to the differential pressure. In addition, an inner diameter reduction part was formed in the bridge pipe to prevent the orifice pipe from being pushed toward the center head by differential pressure.

1 is a partial side cross-sectional view showing the structure of an oil recovery part of a conventional scroll compressor.
Figure 2 is a side cross-sectional view of an embodiment of the present inventors scroll compressor.
3 is a side cross-sectional view of another embodiment of the scroll compressor of the present invention.
4 is an enlarged view of part A in FIG. 2.
Figures 5a and 5b is a view showing another form of the bridge means in the present invention.
Figure 6 is a view showing the structure of the fixed scroll in the present invention.

Hereinafter, exemplary embodiments of the scroll compressor according to the present invention will be described in detail with reference to the accompanying drawings.

First, a structure of an electric compressor or scroll compressor to which the present invention is applied will be described with reference to FIG. 2.

Referring to FIG. 2, the electric compressor or scroll compressor to which the present invention is applied includes a casing 10, a driving unit 20 generating a driving force inside the casing 10, and a driving unit rotated by the driving unit 20. It may include a shaft 30, a compression mechanism 40 that is driven by the drive shaft 30 to compress the refrigerant.

The casing 10 includes a first housing 11 accommodating the driving unit 20, a second housing 12 accommodating an inverter 50 controlling the driving unit 20, and the compression mechanism 40 It may include a third housing 13 to accommodate.

The first housing 11 includes an annular wall 11a, a first partition 11b covering one end of the annular wall 11a, and a second partition 11c covering the other end of the annular wall 11a. ), and the annular wall 11a, the first partition 11b, and the second partition 11c may form a driving part accommodation space in which the driving part 20 is accommodated.

The second housing 12 may be coupled to the side of the first partition wall 11b to form an inverter accommodation space in which the inverter 50 is accommodated.

The third housing 13 may be coupled to the second partition wall 11c to form a compression space in which the compression mechanism 40 is accommodated.

Here, the second partition wall 11c partitions the driving unit receiving space and the compression space, and serves as a main frame supporting the compression mechanism 40, and the driving unit is located at the center side of the second partition wall 11c. A shaft hole 14a through which the drive shaft 30 interlocks the compression mechanism 40 with the 20 may be formed.

Meanwhile, the fixed scroll 41 of the compression mechanism 40 may be fastened to the second partition wall 11c, and the third housing 13 may be fastened to the fixed scroll 41. However, the present invention is not limited thereto, and the third housing 13 may accommodate the compression mechanism 40 and may be fastened to the second partition wall 11c.

The driving unit 20 may include a stator 21 fixed to the first housing 11 and a rotor 22 rotated by interaction with the stator 21 inside the stator 21. .

The driving shaft 30 passes through the central portion of the rotor 22, and one end of the driving shaft 30 protrudes toward the first partition wall 11b with respect to the rotor 22, and is driven. The other end of the shaft 30 may protrude toward the second partition wall 11c based on the rotor 22.

One end portion 30a of the driving shaft 30 may be rotatably supported by a first bearing 71 provided at a center side of the first partition wall 11b.

Here, a first support groove 11d into which one end of the first bearing 71 and the driving shaft 30 is inserted is formed at the center side of the first partition wall 11b, and the first bearing 71 It may be interposed between the first support groove (11d) and one end of the drive shaft (30).

The other end portion 30b of the drive shaft 30 may pass through the shaft hole 14a of the second partition wall 11c and be connected to the compression mechanism 40.

In addition, the eccentric bush 33 is connected to the other end 30b of the rotation shaft 30 by a connection pin 31. The eccentric bush 33 may be rotatably supported by a third bearing 73 provided in the compression mechanism 40. In addition, the rotational force is transmitted to the orbiting scroll 42 in connection with the third bearing 73.

Here, a second support groove 14b in which the second bearing 72 is disposed is formed in the shaft hole 14a of the second partition wall 11c, and the second bearing 72 is the second support groove It may be interposed between (14b) and the rotation shaft (30).

In addition, a boss portion 42a into which the third bearing 73 and the eccentric bush 33 are inserted is formed in the orbiting scroll 42 of the compression mechanism 40, and the third bearing 73 It may be interposed between the boss portion (42a) and the eccentric bush (33).

The compression mechanism 40 is engaged with the fixed scroll 41 and the fixed scroll 41 disposed on the opposite side of the driving unit 20 with respect to the second partition 11c to form a compression chamber C. And it may include an orbiting scroll 42 that is orbited by the drive shaft 30.

The fixed scroll 41 includes a disk-shaped fixed plate portion 41a and a fixed wrap 41c protruding from the compression surface 41b of the fixed plate portion 41a and engaged with the orbiting scroll 42. I can.

A discharge port 41d for discharging the refrigerant compressed in the compression chamber may be formed at the center side of the fixed plate part 41a through the fixed plate part 41a. Here, the discharge port 41d may communicate with a discharge space formed between the fixed scroll 41 and the third housing 13.

The scroll compressor according to this configuration may transmit rotational force to the orbiting scroll 42 while the drive shaft 30 rotates together with the rotor 22 when power is applied to the drive unit 20. Then, the orbiting scroll 42 performs a orbiting motion by the drive shaft 30, so that the compression chamber C may be continuously moved toward the center, thereby reducing the volume. Then, the refrigerant may flow into the driving unit accommodation space through a refrigerant inlet (not shown) formed in the annular wall 11a of the first housing 11. Then, the refrigerant in the receiving space of the driving unit may be sucked into the compression chamber through a refrigerant passage hole (not shown) formed in the second partition wall 11c of the first housing 11. Then, the refrigerant sucked into the compression chamber (C) may be compressed while moving toward the center along the movement path of the compression chamber (C) and discharged to the discharge space through the discharge port (41d). A series of processes in which the refrigerant discharged into the discharge space is discharged to the outside of the scroll compressor through the refrigerant discharge port formed in the third housing 13 are repeated.

In this process, the drive shaft 30 is rotatably supported by the first bearing 71 and the second bearing 72, and the orbiting scroll 42 is supported by the third bearing 73. It is rotatably supported with respect to the drive shaft 30, the third bearing 73 to reduce the weight and size of the assembly of the third bearing 73 and the orbiting scroll 42 (hereinafter, the orbiting body) For this purpose, it may be formed of a bearing 73 different from the first bearing 71 and the second bearing 72.

Specifically, the first bearing 71 and the second bearing 72 fixed to the casing 10 may each be formed of a ball bearing to minimize friction loss.

On the other hand, the third bearing 73, which is in a proportional relationship with the weight and size of the orbiting body as it orbits together with the orbiting scroll 42, has a smaller weight and size than a ball bearing, and a needle roller bearing that is cheaper in cost. It may be formed as a roller bearing or a slide bush bearing. In addition, the third bearing 73 may be press-fitted to the boss part 423 by a predetermined press force.

Hereinafter, the structure of the foil recovery unit, which is the main feature of the present invention, will be described.

First, in the scroll compressor of the present invention, the pressure for each part is as follows, the pressure Pd of the discharge chamber F, the pressure Pc of the back pressure chamber B, and the pressure of the suction chamber D ( Defined as Ps), the pressure value at each point is the pressure (Pd) in the discharge chamber (F)> the pressure in the back pressure chamber (B) (Pc)> the pressure in the suction chamber (D) (Ps). The order is determined.

As an embodiment of the present invention, referring to FIGS. 2, 4 and 6, the scroll compressor of the present invention includes a casing 10, a driving unit 20, a center head 80, a revolving scroll 42, and a fixed scroll. (41), a discharge chamber (F), a back pressure chamber (B), a first oil return passage 94, may be configured to include a bridge means (100).

The discharge chamber F may be formed in the third housing 13 constituting the casing 10 and may be a space through which the refrigerant is discharged from the discharge port 41d. The back pressure chamber (B) may be a space formed between the center head 80 and the orbiting scroll 42, and the orbiting scroll 42 is fixed to the back pressure of the refrigerant introduced into the back pressure chamber (B). It is pushed in the direction of the scroll 41.

The driving unit 20 may be disposed in a driving unit accommodating space formed inside the casing 10 and connected to the driving shaft 30 to rotate. As described above, the driving unit 20 may be a motor composed of a stator and a rotor.

The center head 80 may be disposed through the drive shaft 30 and connected by bolting to the casing 10. The detailed structure is as described above.

The orbiting scroll 42 is connected to the drive shaft 30 and rotates to face the fixed scroll 41, and the fixed scroll 41 is fixed inside the casing 10, and the orbiting scroll ( A compression chamber (C) for compressing the refrigerant through interworking with 42 may be formed, and a first oil recovery passage 94 connected to the oil separation unit 91 of the discharge chamber (F) may be formed.

Specifically, the fixed scroll 41 may include a fixed plate portion 41a, a discharge port 41d, a fixed wrap 41c, and an extension portion 41f.

The fixed plate portion 41a may have a discharge port 41d connected to the discharge chamber F disposed at a central side, and an elongated portion 41f protruding in a radial direction along an outer circumference thereof may be formed. The fixing wrap 41c may be formed in a shape protruding from the fixing plate part 41a in the direction of the orbiting scroll 42.

The extension part 41f is inserted into the stepped part 11f formed inside the first housing 11 constituting the casing 10, and fixes the position of the fixed scroll 41.

In the present invention, the outer wall of the fixed scroll 41 is removed, unlike the conventional one. This is to increase the compression capacity by increasing the radial rotation area of the orbiting scroll 42. Accordingly, the outer periphery of the fixing wrap 41c is open, and the first oil return passage 94 may be formed on the outside of the fixing wrap 41c on the fixing plate part 41a.

Next, the bridge means 100 connects the first oil return passage 94 and the back pressure chamber passage 95 and the suction chamber passage 96 formed in the center head 80, depressurizes the refrigerant and recovers the oil. Can be configured to

Conventionally, the outer wall of the fixed scroll 41 exists to process the through hole and arrange an orifice to decompress the refrigerant and recover the oil, but in the present invention, the outer wall of the fixed scroll 41 is removed, It cannot be designed to machine through-holes.

Therefore, a configuration for connecting the first oil return passage 94 connected to the oil separation unit 91 of the discharge chamber F and the center head 80 was required, which is used as the bridge means 100 in the present invention. Is implemented.

The bridge means 100 may include a bridge pipe 110, an orifice pipe 120, a fixed block 130, and a sealing member 140.

First, the bridge pipe 110 may be press-fitted and fixed to the first oil return passage 94 and the center head 80 and disposed. The orifice tube 120 may be disposed inside the bridge tube 110.

In this case, in order to fix the orifice pipe 120, the fixing block 130 may be disposed inside the bridge pipe 110 to surround the orifice pipe 120. A protrusion 137 is formed around the inner circumference of the fixing block 130, and the protrusion 137 is coupled by inserting an insertion groove 123 formed around the orifice pipe 120, and the orifice pipe 120 It is to be fixed to the inside of the bridge pipe (110).

Here, the bridge pipe 110 is the orifice pipe 120 and the fixed block 130 by the differential pressure between the pressure (Pd) of the discharge chamber (F) and the pressure (Pc) of the back pressure chamber (B). In order to prevent separation in the direction of the center head 80, an inner diameter reducing part 115 may be formed in which the inner diameter decreases from the first oil return passage 94 toward the center head 80.

Since the pressure (Pd) of the discharge chamber (F) is formed relatively higher than the pressure (Pc) of the back pressure chamber (B), the orifice pipe 120 and the fixed inside the bridge pipe 110 The block 130 receives a force according to the differential pressure in the direction of the center head 80. At this time, since the inner diameter reducing portion 115 is formed, the orifice pipe 120 and the fixing block 130 are supported on the inner surface of the inner diameter reducing portion 115 and are not pushed and their position is maintained.

And in the present invention, the bridge pipe 110 is not separated by the pressure difference between the pressure (Pd) of the discharge chamber (F) and the pressure (Pc) of the back pressure chamber (B), in the center head 80 The indentation depth D1 in the first oil return passage 94 may be relatively deeper than the indentation depth D2.

That is, since the pressure (Pd) of the discharge chamber (F) is higher than the pressure (Pc) of the back pressure chamber (B), the bridge pipe 110 due to the differential pressure is the center head in the discharge chamber (F) ( 80) direction will receive a strong force. This allows the bridge pipe 110 to be separated from the first oil return passage 94, so that the pressure-in depth D1 on the first oil return passage 94 is made deeper so that it is firmly fixed. .

Next, a sealing seat 131 is formed around the outer periphery of the fixing block 130, and the sealing member 140 is disposed on the sealing seat 131 to prevent leakage of refrigerant and oil. Here, in order to secure a space in which the sealing seating portion 131 is formed, the sealing seating portion 131 on the fixing block 130 may be disposed outside a position corresponding to the protruding portion 137.

The bridge pipe 110 may be made of a metal material such as iron, aluminum, or copper pipe, and may be drawn to form an exterior. In addition, the fixing block 130 may be made of plastic, and may be manufactured by injection molding. The sealing member 140 may be made of rubber, silicon, or the like, and may be in the form of an O-ring.

Meanwhile, as another embodiment, referring to FIGS. 3, 4 and 6, the scroll compressor of the present invention includes a casing 10, a drive unit 20, a center head 80, a revolving scroll 42, and a fixed scroll 41. ), a discharge chamber (F), a back pressure chamber (B), the first and second oil return passages 94 and 97, a bridge means 100 and a pressure reducing orifice 200. Description of the casing 10, the driving unit 20, the center head 80, the orbiting scroll 42, the fixed scroll 41, the discharge chamber (F) and the back pressure chamber (B) is an embodiment of the present invention. It is the same as that, so it is omitted.

In another embodiment of the present invention, the bridge means 100 is a branch point branching into the first oil return passage 94 and the back pressure chamber passage 95 and the suction chamber passage 96 formed in the center head 80 It can be configured to connect G), depressurize the refrigerant and recover the oil.

In addition, the pressure reducing orifice 200 may be disposed in the second oil recovery passage 97 formed between the branch point G and the suction chamber passage 96, and configured to decompress the refrigerant and recover the oil.

Conventionally, the outer wall of the fixed scroll 41 exists to process the through hole and arrange an orifice to decompress the refrigerant and recover the oil, but in the present invention, the outer wall of the fixed scroll 41 is removed, It cannot be designed to machine through-holes.

Therefore, a configuration for connecting the first oil return passage 94 connected to the oil separation unit 91 of the discharge chamber F and the branch point G was required, which is implemented by the bridge means 100 in the present invention. do.

The bridge means 100 may include a bridge pipe 110, an orifice pipe 120, a fixed block 130, and a sealing member 140.

First, the bridge pipe 110 may be press-fitted and fixed to the first oil return passage 94 and the branch point G and may be disposed. The orifice tube 120 may be disposed inside the bridge tube 110.

In this case, in order to fix the orifice pipe 120, the fixing block 130 may be disposed inside the bridge pipe 110 to surround the orifice pipe 120. A protrusion 137 is formed around the inner circumference of the fixing block 130, and the protrusion 137 is coupled by inserting an insertion groove 123 formed around the orifice pipe 120, and the orifice pipe 120 It is to be fixed to the inside of the bridge pipe (110).

Here, the bridge pipe 110 is the orifice pipe 120 and the fixed block 130 by the differential pressure between the pressure (Pd) of the discharge chamber (F) and the pressure (Pc) of the back pressure chamber (B). In order to prevent departure from the direction of the second oil return passage 97, an inner diameter reduction part 115 whose inner diameter decreases from the first oil return passage 94 toward the second oil return passage 97 is provided. Can be formed.

Since the pressure (Pd) of the discharge chamber (F) is formed relatively higher than the pressure (Pc) of the back pressure chamber (B), the orifice pipe 120 and the fixed inside the bridge pipe 110 The block 130 receives a force according to the differential pressure in the direction of the second oil return passage 97. At this time, since the inner diameter reducing portion 115 is formed, the orifice pipe 120 and the fixing block 130 are supported on the inner surface of the inner diameter reducing portion 115 and are not pushed and their position is maintained.

And in the present invention, the bridge pipe 110 is not separated by the pressure difference between the pressure (Pd) of the discharge chamber (F) and the pressure (Pc) of the back pressure chamber (B), the second oil return passage 97 ), or when the second oil return passage 97 is not formed, the press-in depth D1 in the first oil return passage 94 is relatively higher than the center head 80 It can be press-fit more deeply.

That is, since the pressure (Pd) of the discharge chamber (F) is higher than the pressure (Pc) of the back pressure chamber (B), the bridge pipe 110 due to the differential pressure is the branch point (G) in the discharge chamber (F). ) Direction will receive a strong force. This allows the bridge pipe 110 to be separated from the first oil return passage 94, so that the pressure-in depth D1 on the first oil return passage 94 is made deeper so that it is firmly fixed. .

Next, a sealing seat 131 is formed around the outer periphery of the fixing block 130, and the sealing member 140 is disposed on the sealing seat 131 to prevent leakage of refrigerant and oil. Here, in order to secure a space in which the sealing seating portion 131 is formed, the sealing seating portion 131 on the fixing block 130 may be disposed outside a position corresponding to the protruding portion 137.

The bridge pipe 110 may be made of a metal material such as iron, aluminum, or copper pipe, and may be drawn to form an exterior. In addition, the fixed block 130 may be made of plastic, and may be manufactured by injection molding. The sealing member 140 may be made of a material such as rubber or silicone, and may have an O-ring shape.

Next, referring to FIGS. 5A and 5B, another form of the bridge means 100 is posted. In other forms of the bridge means 100, in addition to the bridge pipe 110, the orifice pipe 120, the fixing block 130, the inner diameter reducing part 115, the sealing member 140, an extension part 133 ) And a screen mesh 135 may be further included.

First, the extension part 133 may be configured to extend in the direction of the first oil recovery passage 94 on the fixed block 130.

The extension part 133 may include an extension bar 133a, an end block 133b, and a support bar 133c. The extension bars 133a support both sides of the orifice pipe 120 in the longitudinal direction, and may be configured to extend in the direction of the first oil recovery passage 94. And the end block (133b) may be configured to connect the ends of the pair of extension bars (133a). In addition, the support bar (133c) is formed on the side facing each other of the pair of extension bars (133a), it may be provided to fix the end of the orifice tube (110). The extension part 133 serves to form an arrangement region of the screen mesh 135 and at the same time fix the arrangement position of the orifice pipe 110.

In addition, the screen mesh 135 may be fixedly disposed on the extension part 133. A pair of screen meshes 135 may be disposed on both sides of the extension bar 133a.

The screen mesh 135 has a filter function to prevent clogging of the orifice hole 121 by removing foreign substances that may be included in the refrigerant flowing in the oil-containing state from the oil separation unit 91 of the discharge chamber F. Can be done.

The above is merely showing a specific embodiment of the scroll compressor.

Therefore, it is to be noted that those of ordinary skill in the art can easily grasp that the present invention can be substituted and modified in various forms within the scope of the scope of the present invention described in the following claims. do.

10: casing 11: first housing
11a: annular wall 11b: bulkhead
11d: first support groove 11f: stepped portion
12: second housing 13: third housing
14a: shaft hole 14b: second support groove
20: drive unit 21: stator
22: rotor
30: drive shaft 30a: one end of the drive shaft
30b: the other end of the drive shaft
40: compression mechanism 41: fixed scroll
41a: fixed hard plate portion 41b: compression surface
41c: fixed wrap 41d: discharge port
41f: kidney
42: orbiting scroll
50: inverter
71: first bearing 72: second bearing
73: third bearing
80: center head
91: oil separation unit 93: oil recovery unit
94: first oil return passage 95: back pressure chamber passage
96: suction chamber flow path (deleted) 97: second oil return flow path
100: bridge means 110: bridge tube
115: inner diameter reduction unit 120: orifice tube
121: orifice hole 123: insertion groove
130: fixing block 131: sealing seat
133; extension 135: screen mesh
137: protrusion 140: sealing member
200: pressure reducing orifice
B: Back pressure chamber D: Suction chamber
F: discharge chamber G: junction

Claims (15)

Casing;
A driving unit disposed in the driving unit receiving space formed inside the casing and rotating the driving shaft;
A center head through which the driving shaft is disposed and connected to the casing;
A discharge chamber formed on one side of the casing and through which a refrigerant is discharged;
A orbiting stroller connected to the drive shaft;
A fixed scroll fixed inside the casing, forming a compression chamber for compressing a refrigerant by interworking with the orbiting scroll, and having a first oil return passage connected to the oil separation portion of the discharge chamber;
A back pressure chamber formed between the center head and the orbiting scroll; And
A bridge means arranged to connect the first oil return passage and the center head to recover oil by depressurizing a refrigerant;
Scroll compressor comprising a.
The method of claim 1,
A scroll compressor, wherein a second oil return passage connected to the suction chamber is formed in the center head, and the bridge means is connected to the second oil return passage.
The method of claim 2,
A scroll compressor, characterized in that a branch point is formed between the bridge means and the second oil return passage through which a back pressure chamber passage connected to the back pressure chamber is connected.
The method of claim 2,
And a pressure reducing orifice for depressurizing a refrigerant and recovering oil in the second oil return passage.
The method of claim 3,
The fixed scroll,
A fixed plate portion having a discharge port disposed at the center side and having an elongated portion protruding in a radial direction along an outer circumference thereof; And
Including; a fixed wrap protruding from the fixed plate portion in the orbiting scroll direction,
The extension portion is inserted and fixed to a stepped portion formed along the inner circumference of the casing,
The outer periphery of the fixed wrap is open, the first oil return passage is formed on the outer side of the fixed wrap on the fixed plate portion, and is in direct communication with the suction chamber by the bridge means.
The method according to any one of claims 1 to 5,
The bridge means,
A bridge pipe press-fitted and fixed to the first oil return passage and the center head;
An orifice tube disposed inside the bridge tube; And
A fixed block disposed inside the bridge pipe and fixing the orifice pipe;
Scroll compressor comprising a.
The method of claim 6,
The bridge means,
A sealing seat formed to be recessed in the inner direction around the outer periphery of the fixed block; And
A sealing member disposed on the sealing seat;
Scroll compressor comprising a.
The method of claim 7,
A scroll compressor, characterized in that: an insertion groove formed in an orifice hole through which the refrigerant passes through a central side of the orifice tube, and an insertion groove formed to be recessed in an inward direction is disposed around an outer circumference of the orifice tube.
The method of claim 8,
A scroll compressor, characterized in that a protrusion fitted into the insertion groove is formed around an inner circumference of the fixed block.
The method of claim 9,
The scroll compressor, wherein the sealing seating portion is disposed outside a position corresponding to the protruding portion to secure a space of the sealing seating portion on the fixed block.
The method of claim 6,
In order to prevent separation of the orifice pipe and the fixing block due to a pressure difference between the pressure of the discharge chamber and the pressure of the back pressure chamber, the bridge pipe decreases the inner diameter from the first oil return passage toward the center head. Scroll compressor, characterized in that the additional form.
The method of claim 11,
The bridge pipe is press-fit and fixed relatively deeply to the first oil return passage side rather than the center head side so as not to be separated by a pressure difference between the pressure of the discharge chamber and the pressure of the back pressure chamber.
The method of claim 6,
The bridge means,
An extension part extending from the fixed block in the direction of the first oil recovery passage; And
A screen mesh disposed on the extension part;
Scroll compressor comprising a.
The method of claim 13,
The extension part,
A pair of extension bars supporting both sides of the orifice pipe in the longitudinal direction and extending in the direction of the first oil return passage; And
Including; an end block connecting the ends of the pair of extension bars,
The screen mesh is a scroll compressor, characterized in that the fixed block, the end block, and the scroll compressor, characterized in that each disposed in a partition formed by the pair of extension bars.
The method of claim 14,
The extension part,
And a support bar formed on a side facing each other of the pair of extension bars and fixing an end of the orifice tube.

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