KR20110131751A - Scroll compressor - Google Patents

Abstract

PURPOSE: The valve opening and closes the apparatus for oil pouring bruise is established in the apparatus for oil pouring bruise included in the rolling scroll. Amount of the oil provided through the apparatus for oil pouring bruise to the compression room is controlled organically proportionally to the speed of rotation of the drive motor. CONSTITUTION: A scroll compressor comprises a sealed container, a drive motor, a frame, a fixed scroll, and a rolling scroll. The oil of the predetermined amount is accepted to the sealed container. It is installed in the sealed container and the drive motor generates the driving force. The frame is fixed to the sealed container, the fixed scroll is fixed to frame. The rolling scroll is that the compression room along with the fixed scroll it goes in gear and it rotatively moves is formed in the fixed scroll it is installed between the frame and the fixed scroll. An oil injection hole(24) is formed in the rolling scroll. The oil between the rolling scroll and the frame are injected through the oil injection hole to the compression room. The opening amount of the oil injection hole is controlled with the valve member.

Description

Scroll Compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor, and more particularly, to a scroll compressor capable of organically controlling the amount of oil supplied to the compression chamber according to the operating speed.

A scroll compressor is a compressor which compresses refrigerant gas by changing the volume of a compression chamber formed by a pair of opposed scrolls. Scroll compressors are more efficient than reciprocating compressors or rotary compressors, have low vibration and noise, are compact and lightweight, and thus are widely used in air conditioners.

The scroll compressor can be classified into low pressure type and high pressure type according to the pressure of the refrigerant filling the inner space of the sealed container. The low pressure scroll compressor is a method in which the suction pipe communicates with the inner space of the hermetic container and the refrigerant is indirectly sucked into the compression chamber through the inner space of the hermetic container. On the other hand, in the high pressure scroll compressor, the suction pipe is directly connected to the suction side of the compression unit so that the refrigerant is directly sucked into the compression chamber without passing through the inner space of the sealed container.

Meanwhile, the scroll compressor may be classified into a constant speed scroll compressor and an inverter scroll compressor according to the driving method of the driving motor. The constant speed scroll compressor is a compressor whose operating speed is the same regardless of the load variation, and the inverter type scroll compressor is a compressor whose operating speed varies according to the load variation.

However, in the conventional inverter scroll compressor as described above, during initial operation or low speed operation, oil is not smoothly supplied to the compression chamber, so that friction loss or leakage between the laps occurs, whereas oil is excessively transferred to the compression chamber during the high speed operation. As the oil flow rate increased, the performance of the compressor and the refrigeration cycle having the same increased.

An object of the present invention is to provide a scroll compressor that can organically control the amount of oil supplied to the compression chamber according to the operating speed of the compressor.

In order to achieve the object of the present invention, an airtight container containing a predetermined amount of oil; A driving motor installed in the sealed container to generate a driving force; A frame fixedly installed in the sealed container; A fixed scroll fixed to the frame; And a swing scroll provided between the frame and the fixed scroll to form a compression chamber together with the fixed scroll while engaging with the fixed scroll to compress the oil between the frame and the swing scroll. An oil injection hole for injecting into the seal is formed, and the oil injection hole is provided with a scroll compressor whose opening amount is controlled by the valve member.

In the scroll compressor according to the present invention, by installing a valve for opening and closing the oil injection hole in the oil injection hole provided in the turning scroll, the amount of oil supplied to the compression chamber through the oil injection hole is proportional to the rotational speed of the driving motor. By being organically added or subtracted, excessive oil can be prevented from being supplied to the compression chamber during high speed operation. This prevents a rapid increase in oil discharge during high speed operation of the compressor, thereby improving the performance of the compressor and the refrigerating device employing the compressor.

1 is a longitudinal sectional view showing a low pressure scroll compressor of the present invention;
Figure 2 is a longitudinal sectional view showing an oil injection amount adjusting apparatus according to the present invention,
3 is a plan view of the turning scroll equipped with an oil injection amount adjusting device according to FIG.
4 and 5 is a longitudinal sectional view showing an operating state for each operating speed of the oil filling amount adjusting apparatus according to FIG.
Figure 6 is a longitudinal sectional view showing another embodiment of the oil injection amount adjusting apparatus according to FIG.

Hereinafter, the scroll compressor according to the present invention will be described in detail with reference to the embodiment shown in the accompanying drawings.

1 is a longitudinal sectional view showing a low pressure scroll compressor of the present invention.

Referring to FIG. 1, in the scroll compressor according to the present invention, a main frame 20 and a subframe (not shown) are fixedly coupled to upper and lower sides, respectively, in an inner space of the sealed container 10, and the main frame 20 is fixed. Between the subframe (not shown) is installed a drive motor 30 for generating a rotational force. And the fixed scroll 40 is fixedly installed on the upper surface of the main frame 20, between the main frame 20 and the fixed scroll 40 is engaged with the fixed scroll 40 while the pivoting movement to the center Slewing scroll 50 is installed to form a compression chamber (P) to move by, the old dam ring to rotate while preventing the rotation of the rotating scroll (50) between the rotating scroll (50) and the main frame (20) Oldham's ring) 60 is installed.

The inner space of the sealed container 10 is divided into a suction space S1 and a discharge space S2 by the main frame 20 and the fixed scroll 40, and a predetermined amount of oil is contained in the suction space S1. Are accepted. The gas suction pipe SP is coupled to the suction space S1 of the sealed container 10, and the gas discharge pipe DP is connected to the discharge space S2 of the sealed container 10. do.

The main frame 20 has a thrust bearing surface (hereinafter referred to as a first thrust surface) 21 formed on an upper surface thereof, and a driving shaft 33 of the driving motor 30 in the center of the first thrust surface 21. The bearing hole 22 supporting in the radial direction is formed through. An oil pocket 23 is formed at an upper end of the bearing hole 22 so that oil drawn up through the oil passage 36 of the drive shaft 33 is collected, and an oil pocket (3) is formed at a circumferential wall of the oil pocket 23. An oil supply hole 24 for guiding oil accumulated in 23 to the thrust surface between the main frame 20 and the turning scroll 50 is inclined.

An oil receiving groove 25 is formed at the end of the oil supply hole 24, that is, the first thrust surface 21 of the main frame 20 to store oil pumped through the oil supply hole 24. Is formed. The oil receiving groove 25 is preferably formed at a position where at least a portion of the oil receiving hole 55 may overlap the turning trajectory of the oil injection hole 55 so as to periodically communicate with the oil injection hole 55 to be described later. And the cross-sectional area of the oil receiving groove 25 is preferably larger than the cross-sectional area of the oil supply hole 24 for the smooth oil injection.

The drive motor 30 is fixed to the inside of the hermetic container 10 and the power is applied from the outside, and the stator 31 is disposed with a predetermined gap inside the stator 31 and The rotor 32 rotates while interacting with the rotor 32, and the drive shaft 33 is coupled to the rotor 32 to transmit the rotational force of the driving motor 30 to the turning scroll 50.

The drive motor 33 is composed of an inverter motor capable of varying the speed of the rotor 32. In addition, the driving shaft 33 is press-fitted into the rotor 32 so that the driving pin 35 is eccentrically coupled to the pivoting scroll 50 at an upper end thereof, and the driving shaft 33 is formed in the axial direction inside the driving shaft 33. An oil passage 36 is formed therethrough, and an oil pump (not shown) is coupled to a lower end of the oil passage 36.

The fixed scroll (40) is formed on the bottom surface of the hard plate portion 41 of the fixed wrap (42) forming a pair of compression chamber (P) in a spiral form, the side of the hard plate portion 41, the closed vessel Suction groove 43 is formed in communication with the suction space (S1) of the (10), the discharge port for discharging the compressed refrigerant to the discharge space (S1) of the closed container 10 in the center of the upper surface of the hard plate portion 41 44 is formed.

The orbiting scroll (50) is a spiral wrap 52 of the two pairs of compression chambers (P) together with the fixed wrap (42) of the fixed scroll (40) on the upper surface of the hard plate portion 51 in a spiral The boss 53 is coupled to the driving shaft 33 to receive power from the driving motor 30 at the center of the bottom surface of the hard plate part 51. The second thrust bearing surface (hereinafter, the second thrust surface) corresponding to the first thrust surface of the main frame 20 is located at one side of the hard plate part 51 and the turning wrap 52 near the outermost end. An oil injection hole 55 for injecting a portion of the oil supplied to the 54 into the compression chamber P is formed. The oil injection hole 55 may be formed to periodically communicate with the oil receiving groove 25 of the main frame 20.

The fixed wrap 42 and the swing wrap 52 may be formed in a symmetrical shape to have the same wrap length, the wrap length of either of the fixed wrap 42 and the swing wrap 52 is different It may be formed into an asymmetrical shape approximately 180 degrees longer than the wrap length of the wrap. When the wrap lengths of the two wraps 42 and 52 are the same, the oil supply hole 24, the oil receiving groove 25, and the oil injection hole 55 may be formed with a phase difference of approximately 180 °, respectively. . However, when the wrap lengths of the two wraps 42 and 52 are different, the outer ends of both wraps are formed at substantially the same position in the length direction of the wrap, so that the oil supply hole 24 and the oil receiving groove 25 are formed. And only one oil injection hole 55 may be formed at the outer ends of the wraps.

In the drawings, reference numeral 36 denotes a balance weight, 37 an oil skirt, and 45 a discharge valve.

The scroll compressor of the present invention as described above operates as follows.

That is, when power is applied to the drive motor 30, the drive shaft 32 rotates with the rotor to transmit a rotational force to the turning scroll 50, the rotational scroll 50 received this rotational force Is rotated by an eccentric distance from the upper surface of the main frame 20 by the Oldham ring 60 between the fixed wrap 42 of the fixed scroll 40 and the turning wrap 52 of the orbiting scroll 50. A pair of compression chambers P continuously moving are formed in the. In addition, the compression chamber P moves to the center by the continuous swing motion of the swing scroll 50 to compress the refrigerant sucked by the volume decrease.

At the same time, an oil pump (not shown) installed at the lower end of the drive shaft 32 pumps the oil filled in the sealed container 10, and the oil is pumped through the oil channel 36 of the drive shaft 33. While being sucked to the top part is supplied to the bearing hole 22 of the main frame 20 while some of the oil is scattered from the top of the drive shaft 33 is collected in the oil pocket 23 of the main frame 20. Is pumped by the boss portion 53 of the turning scroll 50 and accumulated in the oil receiving groove 25 through the oil supply hole 24 of the main frame 20. The oil is injected into the suction port 43 of the fixed scroll 40 through the oil injection hole 55 by the pressure difference, and supplied to the compression chamber P together with the refrigerant to lubricate the compression chamber P. It will seal at the same time.

In this case, oil is smoothly supplied to the first thrust surface 21 and the second thrust surface 54 between the fixed scroll 40 and the turning scroll 50 so that the turning scroll 50 is fixed scroll 40. Can rotate smoothly in the engaged state. In addition, when the appropriate amount of oil is continuously supplied to the compression chamber (P) to prevent the friction loss and leakage loss in the compression chamber (P). However, during the high speed operation of the compressor, too much oil is injected into the compression chamber (P) through the oil injection hole 55, the amount of oil discharge may be excessively increased.

In view of this, the present invention optimizes the amount of oil injected into the compression chamber by opening the oil injection hole widely during the initial operation or the low speed operation of the compressor while blocking the oil injection hole or opening only a part of the oil injection hole during the high speed operation. will be.

Figure 2 is a longitudinal cross-sectional view showing an oil injection amount adjusting apparatus according to the present invention, Figure 3 is a plan view of a turning scroll equipped with an oil injection amount adjusting apparatus according to FIG. 4 and 5 are longitudinal cross-sectional views showing an operating state for each operation speed of the oil filling amount adjusting device according to FIG. 2.

As shown in FIG. 2 and FIG. 3, the upper thrust plate (or bottom surface) of the turning plate 50 of the pivoting scroll 50 corresponds to the first thrust face 21 of the main frame 20 as described above. Face 54 is formed. In addition, a valve groove 56 is formed at a position in communication with the oil injection hole 55 in the second thrust surface 54, and the valve groove 56 is formed according to the turning speed of the turning scroll 50. An oil valve 110 may be installed to selectively open or close the oil injection hole 55 while sliding radially (or linearly).

The valve groove 56 may be larger than the cross-sectional area of the oil injection hole 55 when considering the flow area of the valve. In addition, the valve groove 56 may be formed in the radial direction based on the center of the turning scroll 50 so that the oil valve 110 may move in the radial direction as described above. Based on the center of the turning scroll 50 may be formed in an oblique direction.

The oil valve 110 may be formed in a flat shape as shown in FIGS. 2 and 3, but may be formed in a ball shape or other shape. In addition, the oil valve 110 may be preferable to stably form or open and close the oil injection hole 55 in which the oil through hole 111 is formed in the oil valve 110 as shown in FIGS. 2 and 3. . The oil through hole 111 may be preferably not smaller than the oil injection hole 55 so that oil smoothly flows into the compression chamber.

In addition, the oil valve 110 may be formed of a material such as an engineer plastic rather than a metal material in consideration of colliding with the turning scroll 50 as the oil valve 110 is installed to move in the valve groove 56.

Here, it is preferable that the elastic member 120 is installed between the valve groove 56 and the oil valve 110 so that the valve plate 110 can be elastically supported with respect to the valve groove 56. The elastic member 120 is made of a compression spring as shown in Figures 2 and 3 may be installed on the outside of the oil valve 110, but in some cases made of a tension spring on the inside of the oil valve 110 It may be installed.

In addition, the elastic member 120 is formed to allow the oil valve 110 to open and close the oil injection hole 55 according to the rotational speed of the drive motor 30 in consideration of the weight of the oil valve 110. . For example, when the rotational speed of the drive motor 30 is less than or equal to the first reference speed, the center of the oil through hole 111 and the center of the oil injection hole 55 coincide with each other so that the oil injection hole 55 is completely formed. It becomes an open state. However, when the rotational speed of the drive motor 30 is greater than the first reference speed, the oil injection hole 55 starts to be closed by the oil valve 110, and the rotational speed of the drive motor 30 is increased. When the second reference speed is faster than the first reference speed, the oil injection hole 55 may be formed to be completely closed by the oil valve 110.

The scroll compressor according to the present invention as described above has the following effects.

That is, as shown in FIG. 4, when the compressor performs a low speed operation (below the first reference speed), the oil valve 110 is oiled by the weight of the oil valve 110 and the elastic force of the elastic member 120. The injection hole 55 is kept open. In this case, the oil injection hole 55 coincides with the oil through hole 111, and the oil pumped through the oil supply hole 24 opens the oil injection hole 55 so that the oil injection hole 55 and the oil through hole ( 111 is smoothly supplied to the compression chamber (P) via.

On the other hand, when the compressor performs a high speed operation (higher than the first reference speed) as shown in FIG. 5, the oil valve 110 overcomes the elastic force of the elastic member 120 and starts to slide outward by centrifugal force. Then, the oil injection hole 55 starts to be partially closed, thereby reducing the amount of oil supplied to the compression chamber P. In addition, when the compressor operates at a higher speed than the second reference speed, the oil injection hole 55 is completely closed while the oil valve 110 is completely pushed outward. Then, the oil may not be injected into the compression chamber P through the oil injection hole 55, thereby preventing the oil amount from being excessively injected into the compression chamber. However, a part of the oil filled in the suction space (S1) of the sealed container 10 is sucked with the refrigerant when the refrigerant is sucked into the suction port 43 is supplied to the compression chamber (P), so the appropriate amount of oil is supplied to the compression chamber Can be.

In this way, while the amount of oil supplied to the compression chamber is organically added or subtracted in proportion to the rotational speed of the driving motor, excessive supply of oil to the compression chamber during high speed operation can be prevented. This prevents a rapid increase in oil discharge during high speed operation of the compressor, thereby improving the performance of the compressor and the refrigerating device employing the compressor.

On the other hand, the valve groove may be formed by grooving in the turning scroll. Figure 6 is a longitudinal cross-sectional view showing another embodiment of the oil injection amount adjusting apparatus according to FIG.

In this case, the valve groove 56 is formed by grooving a predetermined depth in the radial direction or the oblique direction on the outer circumferential surface of the swing scroll 50, as shown in Figure 6, the oil valve ( After inserting 110 and the elastic member 120, the outer end of the valve groove 120 may be closed by a stopper 57. Even in this case, the amount of oil injected into the compression chamber P may be appropriately added or reduced in proportion to the rotational speed of the compressor to prevent a rapid increase in the amount of oil discharged during high speed operation of the compressor. In addition, as the valve groove 120 is formed in the pivoting scroll 50, the refrigerant leaks through the valve groove 56 in the axial direction or by the edge of the valve groove 56. It is possible to prevent the wear of the thrust surface of the main frame (40) in advance.

20: main frame 24: oil supply hole
25: oil receiving groove 40: fixed scroll
50: turning scroll 55: oil injection hole
56: valve groove 110: oil valve
111: oil through hole 120: elastic member

Claims (9)

An airtight container containing a predetermined amount of oil;
A driving motor installed in the sealed container to generate a driving force;
A frame fixedly installed in the sealed container;
A fixed scroll fixed to the frame; And
And a pivoting scroll provided between the frame and the fixed scroll to form a compression chamber together with the fixed scroll while pivoting in engagement with the fixed scroll.
And an oil injection hole for injecting oil between the frame and the swing scroll into the compression chamber, wherein the opening amount is controlled by a valve member. The method of claim 1,
And the drive motor is a motor having a variable rotational speed, and the valve member has a variable opening amount according to the rotational speed of the swinging scroll in accordance with the rotational speed of the driving motor. The method of claim 2,
And a valve groove is formed in the pivoting scroll, and the valve member is inserted into the valve groove to slide. The method of claim 3,
And the valve groove is formed at a predetermined depth on the surface of the swing scroll or formed inside the swing scroll. The method of claim 4, wherein
And the valve member has an oil through hole formed therein so as to communicate with an oil injection hole of the swing scroll. The method of claim 4, wherein
And the valve member is elastically supported by the elastic member. The method of claim 1,
And the oil injection hole is formed before the start of compression. The method of claim 1,
The frame has a bearing hole for supporting the drive shaft of the drive motor, an oil pocket is formed at the upper end of the bearing hole to extend than the bearing hole, the main surface of the oil pocket and the pivoting scroll is supported in the axial direction A scroll compressor having an oil supply hole formed between thrust surfaces. The method of claim 8,
And an oil receiving groove wider than the cross-sectional area of the oil supply hole is formed at the thrust surface side end of the oil supply hole, and the oil receiving groove is formed to communicate with the oil supply hole.

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