KR20060035495A - Oil emission reduction device of high pressure scroll compressor - Google Patents

Abstract

The present invention relates to a device for reducing oil discharge of a high-pressure scroll compressor, comprising: a casing filled with a predetermined amount of oil, a frame fixedly installed in the casing, a drive shaft supporting the frame, and transmitting a driving force of the drive motor; And a pair of compression chambers which are continuously engaged together with the swinging scroll which rotates by the rotational movement, and the suction port for guiding the suction refrigerant into the compression chamber and the discharge port for discharging the compressed gas of the compression chamber into the inner space of the casing. A fixed scroll which is formed and fixed to the frame, a gas suction pipe which is directly connected to the suction port of the fixed scroll to guide the refrigerant to the compression chamber, and a gas which is connected to the inner space of the casing to guide the discharge of the compressed gas in the casing. In a high pressure scroll compressor including a discharge pipe, a compartment divided around a frame and a fixed scroll. By installing a communication tube communicating the two spaces on the outer side of the casing so that the refrigerant gas discharged through the discharge port of the fixed scroll and the oil move through the discharge port of the fixed scroll to the other space, the oil remains in the lower half of the casing It is possible to prevent the deterioration of the reliability of the compressor and the performance of the system due to the lack of oil inside, and to improve the performance of the motor by allowing refrigerant gas to be discharged while cooling the driving motor.

Description

Oil discharge reduction device of high pressure scroll compressor {APPARATUS FOR REDUCING OIL DISCHARGE OF HIGH PRESSURE SCROLL COMPRESSOR}

1 is a cross-sectional view showing an example of a conventional high pressure scroll compressor;

2 is a cross-sectional view taken along line "I-I" of FIG. 1;

3 is a cross-sectional view showing an example of the high-pressure scroll compressor of the present invention;

4 is a cross-sectional view taken along line "II-II" of FIG. 3;

5 is a schematic view showing an example of an oil separation member in the high pressure scroll compressor of the present invention;

Figure 6 is a schematic view showing a modification of the oil separation member in the high pressure scroll compressor of the present invention.

** Description of symbols for the main parts of the drawing **

1: casing 2: mainframe

2e: oil path 4: drive motor

4A: Stator 4B: Rotor

5: drive shaft 6: fixed scroll

6e: oil passage 7: turning scroll

10: communication tube 20: oil separation member                 

h: Gas flow path S1, S2: Upper and lower space

The present invention relates to a device for reducing the oil discharge of a scroll compressor, and more particularly, to a device for reducing the oil discharge of a high pressure scroll compressor that blocks a flow of oil by installing a communication pipe outside the casing in the high pressure scroll compressor.

In general, a scroll compressor is a high-efficiency low noise compressor widely applied to an air conditioner. A plurality of compression chambers are formed in pairs between scrolls while the two scrolls rotate relative to each other, and the compression chamber continuously moves toward the center. The volume decreases and the refrigerant gas is continuously sucked and compressed to be discharged.

The scroll compressor can be classified into low pressure type and high pressure type according to whether the suction gas or the discharge gas is filled in the casing. As shown in FIG. 1, the high-pressure scroll compressor maintains a high pressure state and fixes the casing 1 having a gas suction pipe SP and a gas discharge pipe DP and fixed to upper and lower sides of the casing 1, respectively. A main motor 2 and a subframe 3, a drive motor 4 mounted between the main frame 2 and the subframe 3 to generate rotational force, and a rotor 4B of the drive motor 4; A drive shaft 5 which is press-fitted into the center and penetrates the main frame 2 to transmit the rotational force of the drive motor 4, and is fixedly installed on the upper surface of the main frame 2 to directly couple the gas suction pipe SP. A fixed scroll (6), a pivoting scroll (7) rotatably mounted on an upper surface of the main frame (2) to be engaged with the fixed scroll (6) to form a plurality of compression chambers (P), and a pivoting scroll (7); Oldham's ring (8) is provided between the main frame (2) to swing while preventing the rotation of the swing scroll (7) And also.

The gas suction pipe SP passes through the casing 1 and communicates with the suction port 6b of the fixed scroll 6, while the gas discharge pipe DP is disposed on the opposite side of the fixed scroll 6 around the main frame. It is installed so as to be sealed in the inner space.

The main frame 2 forms a shaft hole 2a for radially supporting the drive shaft 5 in the center thereof, and the boss portion 7b of the swing scroll 7 is pivoted in the upper half of the shaft hole 2a. The boss accommodating groove (2b) is formed to extend, and the upper surface edge has a predetermined internal volume with the rear surface of the turning scroll (7) and the annular back pressure space groove so that the refrigerant gas of the intermediate pressure side pressure is filled in the internal volume. (2c) is formed to be negative.

In addition, the main frame 2 has its outer circumferential surface in close contact with the inner circumferential surface of the casing 1 to be fixedly welded, and the gas discharge pipe DP communicates with the opposite side of the fixed scroll 6 about the main frame 2. As installed, gas communication grooves 2c are formed at appropriate locations along the outer circumferential surface of the main frame 2 so that the discharge gas discharged through the fixed scroll 6 can be guided to the gas discharge pipe DP. .

The drive motor 4 is composed of a stator 4A inserted into and fixed to the inner circumferential surface of the casing 1, and a rotor 4B rotatably coupled with a predetermined gap inside the stator 4A.

The drive shaft 5 is press-fitted into the rotor 4B of the drive motor 4 to support the upper and lower sides with the main frame 2 and the subframe 3, respectively, and the oil of the casing 1 is sucked inside. The oil passage 5a is formed long in the axial direction so as to lubricate each bearing surface.

The fixed scroll 6 forms an involute shape of a wrap 6a constituting two pairs of compression chambers P on the bottom surface of the hard plate portion, and an inlet for communicating the gas suction pipe SP to the side of the hard plate portion. And a discharge port 6c communicating with the center of the wrap 6a to the center of the upper surface of the hard plate portion to discharge compressed gas into the upper space S1 of the casing 1, and at the edge of the hard plate portion. As shown in FIG. 2, the gas passage groove 6d is formed to be connected to the gas communication groove 2d of the main frame 2.

The orbiting scroll 7 forms an involute shape of a wrap 7a constituting two pairs of compression chambers P together with the wrap 6a of the fixed scroll 6 on the upper surface of the hard plate portion. In the center of the bottom surface, the above-described driving shaft 5 is coupled to form a boss 7b which receives the power of the driving motor 4. The boss portion 7b of the revolving scroll 7 is inserted into the boss accommodating groove 2b of the main frame 2 to make the revolving movement.

In the figure, reference numeral 3a denotes a shaft hole of the subframe, and 9 denotes a check valve.

The conventional high pressure scroll compressor as described above operates as follows.

That is, when power is applied to the drive motor 4, the turning shaft 6 is rotated with the rotor 4B of the drive motor 4 while the turning scroll 6 is rotated by the old dam ring 8 to the mainframe ( In the upper surface of 2), the pivoting movement is made by an eccentric distance, and the lap 7a of the swing scroll 7 continuously connects the pair of compression chambers P between the lap 6a with the fixed scroll 6. The compression chamber (P) is reduced in volume while moving to the center by the continuous turning motion of the turning scroll (7) to suck and discharge the refrigerant gas.

In more detail, the refrigerant gas is directly sucked into the suction port 6b of the fixed scroll 6 through the gas suction pipe SP, and then compressed in the compression chamber P, through the discharge port 6c of the fixed scroll 6. The refrigerant gas is discharged into the upper inner space of the casing (1), and the refrigerant gas passes through the gas passage groove (6d) of the fixed scroll (6) and the gas communication groove (2d) of the main frame (2) to the lower side of the casing (1). After moving to the inner space, the driving motor 4 is cooled while rising and discharged to the refrigeration cycle system through the gas discharge pipe DP.

On the other hand, the oil is sucked by the oil flow path 5a of the drive shaft 5 by the centrifugal force during the high speed rotation of the drive shaft 5 and drawn up to the upper part, while the part lubricates the shaft hole 3a of the subframe 3, Was recovered from the upper end of the drive shaft 5 and recovered to the bottom of the casing 1 together with oil separated from the discharge gas while lubricating the shaft hole 2a of the main frame 2 through the boss accommodation groove 2b. .

However, in the conventional high-pressure scroll compressor as described above, oil lubricated between the drive shaft 5 and the main frame 2 by suction through the oil passage 5a of the drive shaft 5 is swept away as it interferes with the discharge gas. As soon as it is discharged into the gas discharge pipe (DP), oil shortage occurs inside the casing (1), which causes the motor efficiency to be lowered without effectively cooling the motor (4). Of course, there is a problem in that the oil is discharged into the refrigeration cycle system to lower the performance of the entire system.

  The present invention has been made in view of the problems of the conventional scroll compressor as described above, the refrigerant gas is moved to the lower half of the casing to be discharged through the motor to increase the efficiency of the motor and reduce the emission of oil to reduce the reliability and SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for reducing the oil discharge of a high pressure scroll compressor capable of increasing the performance of a system.

In order to achieve the object of the present invention, a casing filled with a predetermined amount of oil, a frame fixedly installed in the casing, a drive shaft supporting the frame to transmit the driving force of the drive motor, and a pivoting motion by the drive shaft A pair of compression chambers are formed to be continuously engaged with the scroll, and a suction port for guiding suction refrigerant to the compression chamber and a discharge port for discharging the compressed gas of the compression chamber into the inner space of the casing are fixed to the frame. High-pressure scroll including a fixed scroll to be installed, a gas suction pipe which is installed in direct communication with the suction port of the fixed scroll to guide the refrigerant to the compression chamber, and a gas discharge pipe which is connected to the inner space of the casing to guide the discharge of compressed gas in the casing. In the compressor, the space on both sides of the casing, which is divided around the frame and the fixed scroll, Provides a reduction of the oil discharge high pressure scroll compressor unit, characterized in that the installation of the communication pipe communicating the space on either side outside of the casing and the refrigerant gas and the oil discharged through the discharge port of the scroll to move in the other space.

EMBODIMENT OF THE INVENTION Hereinafter, the oil discharge reduction apparatus of the high pressure scroll compressor which concerns on this invention is demonstrated in detail based on one Example shown in an accompanying drawing.                     

Figure 3 is a cross-sectional view showing an example of the high-pressure scroll compressor of the present invention, Figure 4 is a sectional view "II-II" of Figure 3, Figure 5 is a schematic diagram showing an example of the oil separation member in the high-pressure scroll compressor of the present invention. 6 is a schematic view showing a modification of the oil separation member in the high pressure scroll compressor of the present invention.

As shown in the drawing, the high-pressure scroll compressor according to the present invention includes a casing (1) which fills a predetermined amount of oil and maintains a high pressure state, and is fixed to an upper side of the casing (1), and the inside of the casing (1) is upper space. Main frame 2 partitioned into S1 and lower space S2, drive motor 4 for generating rotational force by fixing to one side of casing 1 with respect to main frame 2, and the inside of the casing Fixedly mounted on the drive shaft 5 for transmitting the driving force of the drive motor 4 to the upper surface of the main frame 2, and the inside of the casing 1 is partitioned into both side spaces S1 and S2. The fixed scroll (6) for directly coupling the gas suction pipe (SP) and the drive shaft (5) is eccentrically coupled to the upper surface of the main frame (2) and engaged with the fixed scroll (6) by Oldham ring (8) The swinging scroll 7 which forms two pairs of compression chambers P while turning, and the spaces S1 and S2 of the casing 1 Communication tube 10 is coupled to the outer periphery of the casing (1) to communicate.

The gas suction pipe SP passes through the casing 1 and communicates with the suction port 6b of the fixed scroll 6 while the gas discharge pipe DP is in the lower half of the casing 1 with respect to the main frame 2. It is made by communicating so as to seal in the space.

The main frame 2 forms a shaft hole 2a for radially supporting the drive shaft 5 in the center thereof, and the boss portion 7b of the swing scroll 7 is pivoted in the upper half of the shaft hole 2a. The boss accommodating groove (2b) is formed to extend, and the upper surface edge has a predetermined internal volume with the rear surface of the turning scroll (7) and the annular back pressure space groove so that the refrigerant gas of the intermediate pressure side pressure is filled in the internal volume. (2c) is formed negatively. In addition, the main frame 2 is negatively formed or penetrated in the outer peripheral surface of the oil passage (2e) for guiding the remaining oil to the lower space (S2) of the casing (1), which is separated from the gas and not discharged into the communication tube (10). Form.

The drive motor 4 is fixedly installed on the inner circumferential surface of the casing 1 and is rotatably disposed inside the stator 4A and the stator 4A, which are formed in a substantially hexagonal shape so as to form a gas flow path h on the outer circumferential surface thereof. Consisting of a rotor 4B. In addition, the drive motor 4 is located lower than the height of the gas discharge pipe (DP) while the position higher than the outlet end of the communication pipe 10 described above through the communication pipe 10 through the lower space of the casing (1) again It is preferable to be able to smoothly contact the refrigerant gas flowing into the (S2) and discharged to the gas discharge pipe (DP).

The fixed scroll 6 is formed in the involute shape of the wrap 6a constituting the two pairs of compression chambers P together with the wrap 7a of the turning scroll 7 on the bottom of the hard plate part. An inlet 6b communicating with the gas suction pipe SP is formed in the upper part of the upper surface of the hard plate part, which communicates with the center of the wrap 6a to discharge the compressed gas into the upper space S1 of the casing 1. An oil passage (6c) is formed, and at the edge of the hard plate portion, the oil passage (10) is formed in line with the oil passage (2e) of the main frame (2) to guide the filtered oil to the lower space (S2) of the casing (1). 6e).                     

The communication tube 10 has an inlet end communicating with the upper space S1 of the casing 1 bisected by the main frame 2 and the fixed scroll 6, while the outlet end thereof has a lower space of the casing 1 ( Coupled to communicate with S2), the outlet end is preferably connected to communicate with a lower position than the height of the drive motor (4) as described above.

In addition, the communication tube 10 is installed on the inner circumferential surface of the casing (1) in contact with the outlet end of the oil separation member 11 made of a "plate" shaped plate body that is opened in the mesh or axial direction through the communication tube (10) It is preferable to separate the oil from the incoming refrigerant gas.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

In the drawings, reference numeral 9 denotes a check valve, and C denotes a winding coil.

The apparatus for reducing oil discharge of the high pressure scroll compressor of the present invention as described above has the following effects.

That is, while the rotating shaft 7 rotates by the eccentric distance while the driving shaft 5 rotates together with the rotor 112 of the driving motor 110 by the applied power, the turning scroll 7 is fixed scroll. Compression chamber P whose volume is narrowed while moving continuously with (6) is formed in pairs, and refrigerant gas is suction-compressed-discharged.

Here, the discharge gas is discharged into the upper space (S1) of the casing (1) divided by the main frame (2) and the fixed scroll (6) and then the lower space (S2) of the casing (1) through the communication tube (10) Flows into. In this discharge gas, the refrigerant gas is separated from the oil and is guided to the gas discharge pipe (DP) while passing through the gas flow path (h) provided on the outer circumferential surface of the stator (4A) of the drive motor (4). The lower half of the casing 1 remains. At this time, when the oil separation member 20 made of mesh or plate is installed at the outlet end of the communication tube 10, the refrigerant gas and oil can be separated more smoothly from the discharge gas exiting the communication tube 10. Can effectively block the outflow.

In this way, the oil mixed with the refrigerant gas and discharged from the compression chamber can be reduced by mixing with the refrigerant gas and flowing out into the system, thereby preventing the compressor reliability and system performance from being deteriorated due to the lack of oil in the compressor. can do. In addition, by driving the refrigerant gas to the lower side of the drive motor to be discharged to the system while passing through the drive motor can effectively cool the drive motor can improve the motor efficiency.

In the oil discharge reduction device of the high pressure scroll compressor according to the present invention, a communication pipe communicating with the upper space and the lower space of the casing is installed outside the casing to guide discharge gas discharged from the upper space of the casing to the lower space of the casing. By effectively separating the refrigerant gas and the oil, the oil remains in the lower half of the casing, thereby preventing the compressor from deteriorating the reliability of the compressor due to the lack of oil inside the casing and reducing the performance of the system. By discharging, the performance of the motor can be improved.

Claims (6)

A casing filled with a predetermined amount of oil, a frame fixed to the inside of the casing, a drive shaft supporting the frame to transmit the driving force of the drive motor, and a rotating scroll which is pivoted by the drive shaft, so as to continuously move together. A fixed scroll for forming a pair of compression chambers, a suction port for guiding suction refrigerant to the compression chamber, and a discharge port for discharging the compressed gas of the compression chamber into the inner space of the casing and fixedly installed in the frame; In the high-pressure scroll compressor including a gas suction pipe installed in direct communication with the suction port to guide the refrigerant to the compression chamber, and a gas discharge pipe installed in the inner space of the casing to guide discharge of the compressed gas in the casing. It is characterized by installing a communication tube communicating the two spaces on the outer side of the casing so that the refrigerant gas and oil discharged through the discharge port of the fixed scroll to the other space by communicating the two spaces of the casing partitioned around the frame and the fixed scroll. The oil discharge reduction device of the high pressure scroll compressor. The method of claim 1, The communication pipe is the oil discharge reduction device of the high-pressure scroll compressor, characterized in that the outlet is formed on the opposite side of the gas discharge pipe with the drive motor. The method of claim 2, The oil discharge reduction device of the high-pressure scroll compressor, characterized in that the oil separation member is installed on the inner circumferential surface of the casing corresponding to the outlet side of the communication tube to separate the oil from the refrigerant gas flowing back into the casing through the communication tube. The method of claim 3, Oil separation member of the high pressure scroll compressor, characterized in that the oil discharge member is formed in a mesh shape. The method of claim 3, An oil discharge reducing device of the high pressure scroll compressor, characterized in that the oil separation member is a plate opening in the axial direction. The method according to claim 1 or 3, The fixed scroll and the frame is an oil discharge reduction device of the high-pressure scroll compressor, characterized in that for forming the oil passage so that the oil filtered in the upstream space to move directly to the downstream space based on the discharge sequence of the refrigerant gas.

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