KR100608694B1 - Apparatus for reducing oil discharge 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, and the present invention provides a casing filled with a predetermined amount of oil, a frame installed in the inner space of the casing, and a rotor installed in the inner space of the casing to rotate the rotor. A driving motor which is transmitted to the drive shaft, a suction chamber which is engaged with the swinging scroll which rotates by the drive shaft of the driving motor, forms a compression chamber and guides the refrigerant to the compression chamber, and a discharge port for discharging the refrigerant in the compression chamber into the inner space of the casing. The fixed gas to be formed, and the oil separation passage for separating the oil from the refrigerant discharged into the inner space of the casing by axially penetrating at least one of the rotor or the drive shaft of the drive motor, the refrigerant gas is Cools the motor as it moves from bottom to top, and oil cools down the motor Increasing the efficiency of such motors as well as increasing the oil residues in the interior of the casing at the same time to improve the reliability of the compressor by reducing the oil flow to the system it is possible to improve the overall system performance.

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 graph and a plan view showing the formation position of the oil separation flow path in the high-pressure scroll compressor of the present invention;

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

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

6: Fixed scroll 6a: Wrap of fixed scroll

6b: suction port 6c: discharge port

7: turning scroll 7a: turning scroll lap

110: main frame 111: shaft hole

112: boss receiving groove 114: flow guide hole

115: gas communication groove 120: drive motor

121: stator 122: rotor

122a: oil separation oil 130: drive shaft

131: oil euro 140: flow guide

C: Winding coil

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, by forming an oil separation flow path on the inner circumferential surface of the rotor in a high pressure scroll compressor to block the outflow of oil.

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; The drive shaft 5 is pressed 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 rotating 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 rotating scroll (7). And the Oldham's ring 8 which is installed between the mainframe 2 and pivots while preventing the rotating scroll 7 from rotating. 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 rotor 4B is formed in an annular shape as shown in Fig. 2 and forms a circular shaft insertion hole 4b so as to press the drive shaft 5 into the inner circumferential surface thereof.

The drive shaft 5 press-fits 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 sucks oil from the casing 1 therein. The oil flow path 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. 6b, a discharge port 6c communicating with the center of the wrap 6a in the center of the upper surface of the hard plate portion and discharging the compressed gas into the upper space of the casing 1, and at the edge of the hard plate portion, the main The gas passage groove 6d is formed to be connected to the gas communication groove 2d of the 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 rotating 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) decreases in volume while moving to the center by the continuous swing motion of the swing 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 discharged from the gas as the discharge gas discharged from the compression chamber (P) moves to the lower side of the drive motor (4) as described above, but in reality most of the discharge After the gas and oil pass through the gas communication groove 2d of the main frame 2, the gas and oil are discharged as they move to the gas discharge pipe DP, and the discharge of oil increases rapidly, which causes oil shortage inside the casing 1. While there is a problem that friction is increased between the various parts causing friction loss or wear.

 The present invention has been made in view of the problems of the conventional scroll compressor as described above, by maximizing the separation effect of the discharge gas and oil in the interior of the casing oil discharge of the high pressure scroll compressor that can remain in the casing It is an object of the present invention to provide an abatement apparatus.

In order to achieve the object of the present invention, a casing filled with a predetermined amount of oil, a frame installed in the inner space of the casing, a drive motor installed in the inner space of the casing to transmit the rotational movement to the drive shaft, the drive motor A fixed scroll which forms a compression chamber in engagement with the turning scroll which rotates by the drive shaft of the inlet, guides the refrigerant into the compression chamber, and a discharge port for discharging the refrigerant in the compression chamber into the inner space of the casing; The present invention provides an apparatus for reducing the oil discharge of a high pressure scroll compressor including an oil separation passage through which at least one of an electron or a drive shaft penetrates in an axial direction and separates oil from a refrigerant discharged into an inner space of the casing.

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 graph showing the position of the oil separation flow path in the high pressure scroll compressor of the present invention. And a plan view, and FIG. 6 is a schematic view showing shapes of an oil separation channel 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 for filling a predetermined amount of oil and maintaining a high pressure state, and a main frame 110 and a subframe fixed to upper and lower sides of the casing 1, respectively. (3) and a drive motor 120 fixed between the main frame 110 and the subframe 3 and forming a plurality of oil separation flow passages 122a on the inner circumferential surface of the rotor 122 in an axial direction, and both sides. The fixed scroll for directly coupling the gas suction pipe (SP) and fixedly installed on the upper surface of the main shaft 110 and the drive shaft 130 for transmitting the driving force of the drive motor 120 by supporting the frame 110 (3) (6) and eccentrically coupled to the drive shaft 130 is placed on the upper surface of the main frame 110 and engaged with the fixed scroll (6) while turning by a pair of pairing (8) two pair of compression chamber (P) It includes a turning scroll (7) to form.

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 110. It is made by communicating so as to seal in the space.

The main frame 110 forms a shaft hole 111 supporting the drive shaft 130 in the radial direction at the center thereof, and the boss portion 7b of the swing scroll 7 is pivoted in the upper half of the shaft hole 111. The boss accommodation groove 112 is formed to be extended, and the upper surface edge has a predetermined internal volume with the rear surface of the pivoting 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. 123 to be negatively formed.

In addition, the main frame 110 has its outer circumferential surface in close contact with the inner circumferential surface of the casing 1 to be fixedly welded therein, and the discharge is discharged from the compression chamber P through the discharge port 6c of the fixed scroll 6 therein. The flow guide hole 114 is formed so that gas is guided between the stator 121 and the rotor 122 of the driving motor 120. Here, the flow guide hole 114 may be formed to penetrate directly from the upper surface of the main frame to the bottom surface, but as illustrated in FIG. 3, the gas communication groove having the bottom surface blocked on the outer circumferential surface so as to communicate with the gas passage groove 6d of the fixed scroll 6. A gas communication hole 114 is formed so as to have a predetermined depth and communicate with the gas communication groove 115, and an outlet thereof is formed within a range of a rotor. 122a) is preferred because it can be more easily derived.

In addition, the discharge gas passing through the flow guide hole 114 is introduced into the oil separation passage 122a of the rotor 122 on the bottom of the main frame 110 without being diffused into the inner space of the casing 1. The flow guide guide 140 is installed so that the flow guide guide 140 may be formed in a cylindrical shape so as to accommodate both the flow guide hole 114 and the oil separation passage 122a. In addition, the flow guide guide 140 is preferably formed to be higher than the height of the rotor in consideration of the collision with the rotor 122, or to be formed larger than the outer diameter of the rotor (more precisely, the balance weight) 122. .

The drive motor 120 includes a stator 121 fixedly installed on an inner circumferential surface of the casing 1, and a rotor 122 rotatably disposed inside the stator 121. The rotor 122 is generally formed in a cage shape having several aluminum bars, but the oil separation passage 122a is formed on the inner circumferential surface through which the driving shaft 130 is press-fitted at regular intervals along the circumferential direction.

The oil separation flow passage 122a is a oil separation flow passage in which the driving force of the rotor 122 with respect to the stator 121 is changed when the load of the compression unit changes according to the crank angle as shown in FIG. 5. Since there is a possibility of weakening instantaneously due to (122a), it is preferable to form the oil separation flow passage (122a) at the portion (α) other than the position (θ) corresponding to the drive angle that requires as much driving torque as possible.

In addition, the oil separation passage 122a may be formed vertically in the axial direction as in FIG. 6A, but in order to separate the oil by inhaling gas more effectively, the oil separation passage 122a may be rotated as in FIG. 6B. It is preferable to form inclined by a predetermined angle in the rotation direction of the electron 122 or to form a wider cross-sectional area toward the exit side as shown in (c) of FIG.

On the other hand, although not shown in the drawings, the oil separation passage 122a may be formed on the outer circumferential surface of the drive shaft 130 in contact with the inner circumferential surface of the rotor 122. In this case as well, the oil separation channel may be formed in the same manner as the above-described examples.

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

In the figure, reference numeral 3a denotes a shaft hole of a subframe, 9 a check valve, and C 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, the rotating shaft 7 rotates by an eccentric distance while the driving shaft 130 rotates together with the rotor 122 of the driving motor 120 by the applied power, and the rotating 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 refrigerant gas contains oil and is discharged together, and the discharge gas and the oil pass through the flow guide hole 114 of the main frame 110 and the inner circumferential surface of the rotor 122 of the drive motor 120 and the drive shaft 130. It flows into the oil separation passage 122a provided between the outer circumferential surfaces of the. At this time, the discharge gas and the oil passes through the flow guide hole 114 of the main frame 110 and then the flow guide guide 130 of the casing 1 is blocked by the stator 121 and the rotor 122. Due to the suction force generated when the rotor 122 rotates at high speed without being diffused to the entire inner space, the oil separation path 122a is guided and sucked quickly.

Next, the discharge gas and the oil sucked into the oil separation passage 122a are separated from the inside of the oil separation passage 122a as the rotor 122 rotates at a high speed. While being pushed to the outer circumferential surface of the separation channel 122a and scattered and recovered to the bottom of the casing 1, the discharged gas moves to the lower half of the casing 1 through the oil separation channel 122a and then rises again It is discharged through the pipe (DP). At this time, the oil is scattered after passing through the oil separation passage 122a to cool the winding coil C of the stator 21, while the discharge gas passes through the oil separation passage 122a and the outer circumferential surface of the stator 121. Through the gas discharge pipe (DP) is to cool the motor.

In this way, the driving motor is cooled to a predetermined temperature by the refrigerant gas and the oil discharged into the casing to improve the motor efficiency, and the refrigerant gas and the oil are separated so that the refrigerant gas is discharged smoothly, while most of the oil is Since it remains inside the casing, it is possible to prevent the wear caused by the oil shortage inside the casing, thereby increasing the reliability of the compressor, and preventing the excessive flow of oil into the system, thereby improving the performance of the entire system.

In the oil discharge reduction device of the high pressure scroll compressor according to the present invention, an oil separation flow path is formed between the rotor and the drive shaft, and the flow guide hole receives the flow guide hole near the oil separation flow path. By installing a guide to guide the discharge gas into the oil separation flow path, the refrigerant gas moves from the bottom of the motor to the top to cool the motor, and the oil is scattered from the bottom to cool the motor to increase the efficiency of the driving motor as well as the inside of the casing. Increased oil residuals in the system can improve the reliability of the compressor, while reducing the oil spill into the system, improving the performance of the entire system.

Claims (7)

A casing filled with a predetermined amount of oil, A frame installed in the inner space of the casing, A drive motor installed in the inner space of the casing for transmitting the rotational movement to the drive shaft by the rotor; A fixed scroll which forms a compression chamber in engagement with a turning scroll which rotates by a drive shaft of the drive motor, forms a suction port for guiding the refrigerant into the compression chamber, and a discharge port for discharging the refrigerant in the compression chamber into the inner space of the casing; The oil discharge reduction device of the high-pressure scroll compressor including an oil separation passage for forming an oil through the axial direction through at least one of the rotor or the drive shaft of the drive motor to separate the oil from the refrigerant discharged into the inner space of the casing. The method of claim 1, At least one flow guide hole is formed in the frame to guide the refrigerant discharged from the compression chamber into the inner space of the casing to the oil separation flow path. The method of claim 2, The flow reduction guide of the high-pressure scroll compressor, characterized in that the flow guide hole is installed in the frame to prevent the discharge gas induced through the flow guide hole from being diffused into the inner space of the casing. . The method of claim 1, The oil discharge flow reduction apparatus of the high pressure scroll compressor, characterized in that formed in the vertical direction. The method of claim 1, The oil discharge flow reduction device of the high pressure type scroll compressor, characterized in that the inclined in the forward direction with respect to the rotation direction. The method of claim 1, The oil discharge flow reduction apparatus of the high pressure type scroll compressor, characterized in that the cross-sectional area is formed to be wider toward the lower end. The method according to any one of claims 4 to 6, An oil discharge flow reduction device of a high pressure scroll compressor, characterized in that formed in the inner peripheral surface of the rotor or the outer peripheral surface of the drive shaft.

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