KR20090103580A - Capacity variable device for scroll compressor - Google Patents

Abstract

PURPOSE: A capacity changeable device of a scroll compressor is provided to increase the energy efficiency of the scroll compressor by increasing the capacity of a compression room. CONSTITUTION: A capacity changeable device of a scroll compressor comprises followings. A fixing wrap(51) of a helix is formed at a fixed scroll(50) of a sealed container inside. A rotating scroll has a rotating wrap in order to make a pair of compression rooms while going in gear with the fixing wrap of the fixed scroll. A capacity variable valve is installed at an opening side of the compression room including the fixing wrap and the rotating wrap in order to vary the inhaled amount of the refrigerant to the compression room.

Description

CAPACITY VARIABLE DEVICE FOR SCROLL COMPRESSOR}

The present invention relates to a variable capacity apparatus of a scroll compressor.

Generally, scroll compressor is a high efficiency, low noise compressor widely used in the air conditioner field. In the scroll compressor, two pairs of compression chambers are formed between the two scrolls while the two scrolls rotate relative to each other, and the compression chamber continuously moves toward the center, and the volume thereof decreases, so that the refrigerant is continuously sucked and compressed. It is a discharge method.

The scroll compressor forms a bypass hole in the middle of the compression chamber and uses the bypass hole to move some refrigerant having an intermediate pressure toward the suction groove to change the capacity of the compressor, or connect the discharge pipe and the suction pipe. In the meantime, a method of changing the capacity of the compressor by opening and closing the solenoid valve by installing a solenoid valve is known.

However, in the conventional scroll compressor as described above, since the bypass hole is formed symmetrically about the discharge hole, a plurality of valves must be provided to open and close the bypass hole. Since the production cost can be increased and the bypass holes disposed at a relatively long distance must be controlled at the same time, there was a problem that the reliability can be reduced. In addition, the method of connecting the discharge pipe and the suction pipe has a problem in that the size of the compressor has to be increased and the production cost increases due to the increase in the number of assembly processes because the pipe is complicated and a valve must be installed in the pipe.

In addition, the variable capacity method using the bypass hole has a limitation in changing the capacity in detail because the width of the compression chamber is wide.

The present invention solves the problems of the conventional scroll compressor as described above, by varying the capacity of the compressor by using a bypass hole, the number of valves for controlling it can be reduced, reliability can be increased, and the piping can be simplified by simplifying the compressor. It is an object of the present invention to provide a scroll compressor that can reduce the production cost while miniaturizing the size.

In addition, there is an object of the present invention to provide a variable capacity device of the scroll compressor that can vary the capacity of the compression chamber in detail to about 90 to 100%.

In order to solve the object of the present invention, a sealed container; A fixed scroll fixedly installed inside the sealed container and having a spiral fixed wrap formed therein; And a turning scroll in which a spiral turning wrap is formed so as to form two pairs of compression chambers while being engaged with the fixed wrap of the fixed scroll, and at the inlet side of the compression chamber consisting of the fixed wrap and the turning wrap. There is provided a variable displacement device of a scroll compressor provided with a variable displacement valve installed to vary the suction amount of the refrigerant sucked into the compression chamber.

In the variable scroll device of the scroll compressor according to the present invention, since the capacity of the compression chamber can be increased by utilizing a portion of the suction region as the compression region, the scroll compressor can increase energy efficiency. In addition, the compressor capacity can be easily changed without using a separate bypass hole or pipe, thereby reducing the size of the compressor and reducing the manufacturing cost. In addition, since the capacity of the compression chamber can be changed in detail, the operation of the compressor and the refrigeration cycle can be elaborated.

1 is a longitudinal sectional view showing an example of the low-pressure scroll compressor of the present invention;

FIG. 2 is a perspective view of the scroll compressor according to FIG. 1 separately showing the variable capacity device of the present invention; FIG.

3 is a perspective view illustrating main parts of the variable capacity device of FIG.

4 is a plan view showing the assembled variable capacity device according to FIG.

5 is an enlarged view illustrating an operation of the variable capacity device of FIG. 4;

6 is a perspective view showing another embodiment of the variable displacement device of the present invention in the scroll compressor according to FIG.

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

50: fixed scroll 51: fixed wrap

52: suction groove 53: discharge port

54: hinge groove 55: shaft hole

56: valve slot 60: swing scroll

61: turning wrap 90: capacity variable valve

91: valve portion 92: hinge protrusion

95 drive unit 96 axis

Hereinafter, the variable displacement device of the scroll compressor according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

As shown in FIG. 1, the scroll compressor according to the present invention includes a sealed container 10 having a gas suction pipe SP and a gas discharge pipe DP, and upper and lower sides of the sealed container 10 respectively. The main motor 20 and the subframe 30 to be fixed, the drive motor 40 is mounted between the mainframe 20 and the subframe 30 to generate a rotational force of the mainframe 20, Revolving scroll (50) fixed to the upper surface and the rotating scroll to be pivotally mounted on the upper surface of the main frame 20 to form two pairs of compression chamber (P) in engagement with the fixed scroll (50) ( 60 and the Oldham's ring 70 installed between the swinging scroll 60 and the main frame 20 to prevent rotation of the swinging scroll 60 and the fixed scroll 50. It is installed in the) includes a capacity variable valve 90 for varying the capacity of the compression chamber (P).

The sealed container 10 is composed of a cylindrical container 11 for installing the drive motor 40, and an upper cap 12 and a lower cap 13 coupled to upper and lower sides of the cylindrical container 11. The gas suction pipe SP is coupled to the cylindrical container 11, and the gas suction tube SP is coupled to the upper cap 12 in a direction substantially perpendicular to the longitudinal direction of the hermetic container 10.

As shown in Figures 2 to 5, the fixed scroll 50 is formed in a spiral fixed spiral 51 so as to form a compression chamber (P) on the bottom surface of the hard plate portion, the suction on the outer side of the fixed wrap 51 The groove 52 is formed, and the discharge port 53 is formed at the center side of the fixing wrap 51. The fixed wrap 51 has a lap length that is approximately equal to the wrap length of the turning wrap 61 to be described later, that is, a symmetrical shape so that a pair of compression chambers P may be alternately formed with a phase difference of approximately 180 °. Is formed.

In addition, the displacement variable valve 90 is installed within the range of the suction groove 52 so as to be able to change the capacity of the compression chamber (P) while being detached to the outer peripheral surface of the turning wrap 61 to be described later while operating in the radial direction. . A hinge groove 54 is formed in the hard plate portion of the fixed scroll 50 so that the hinge protrusion 92 provided in the valve portion 91 of the displacement variable valve 90 to be described later can be hinged, and the hinge groove 54 is formed. A shaft hole 55 penetrates radially so that the shaft 96 provided in the drive unit 95 of the capacity variable valve 90 to be described later can be inserted at a position spaced by a predetermined interval in the circumferential direction at 54. Can be.

The orbiting scroll 60 is spirally formed so as to form a pair of compression chambers (P) by engaging the fixed wrap (51) on the upper surface of the hard plate portion.

The displacement variable valve 90 is a valve portion 91 for varying the capacity of the compression chamber (P) by adjusting the interval between the fixed wrap 51 and the swing wrap 61 as shown in FIGS. The driving unit 95 generates power in accordance with the operation mode of the compressor to operate the valve unit 91. The displacement variable valve 91 may be installed between points A and B of FIG. 4. For example, when installed near point A, the capacity of the compression chamber is relatively increased, whereas when installed near point B, the capacity of the compression chamber may be relatively small.

The valve portion 91 is formed to be curved to have the same curvature as the wrap shape of the fixed wrap 51 or the swing wrap 61, the upper surface of one side of the valve portion 91 of the fixed scroll (50) The hinge protrusion 92 is formed to be hinged to the hinge groove 54. In addition, the valve 91 may be formed of a plastic material flexible enough to be slightly deformed when pressurized by the driving unit 95, and may be rubbed with the turning wrap 61, thereby considering lubricity in consideration of wear. It may be formed of a material having a.

A solenoid device configured to add the valve portion 91 while the shaft moves forward or backward in accordance with the power supply of the drive unit 95. The solenoid device is inserted into the shaft hole 55 of the fixed wrap 51 at one side thereof to allow the valve to move. The shaft 96 is provided so that the part 91 may be added.

In the drawings, reference numeral 14 denotes a high and low pressure separator, 41 is a stator, 42 is a rotor, and 43 is a driving shaft.

The conventional scroll compressor as described above is operated as follows.

That is, when the power is applied to the drive motor 40, the rotating shaft 60 is rotated with the rotor 42, the turning scroll 60 is the upper surface of the main frame 20 by the old dam ring 70 The eccentric distance in the pivoting movement, and between the fixed wrap 51 and the pivoting wrap 61, two pairs of compression chambers (P) gradually moving to the center are continuously formed, the compression The seal P moves to the center by the continuous turning motion of the turning scroll 60 and decreases in volume to suction and compress the refrigerant gas, and then discharge the discharge space S2 and the gas discharge pipe DP of the casing 10. Discharged through the refrigeration cycle. At this time, the capacity of the scroll compressor may vary depending on the operation of the displacement variable valve (90).

For example, when the compressor needs to be operated in a low capacity or saving mode, the drive part 95 of the capacity variable valve 90 is retracted to maintain the valve part 91 in contact with the inner circumferential surface of the fixed wrap 51. do. Accordingly, when the pivoting scroll 60 performs the pivoting motion, a predetermined interval is maintained between the pivoting wrap 61 of the pivoting scroll 60 and the stationary wrap 51 of the fixed scroll 50 to maintain the scroll 50. Refrigerant sucked into the suction groove 52 of the) is passed through the displacement variable valve 90 is sucked into the compression chamber (P). That is, as the starting point of the compression chamber P is formed in earnest from the point B of FIG. 4, the point where the suction groove 52 ends, the volume of the entire compression chamber P becomes relatively narrow so that the compression capacity is lowered. do.

On the other hand, when the compressor needs to be operated in a high capacity or power mode, the driving unit 95 of the displacement variable valve 90 is advanced so that the valve unit 91 is slightly spaced apart from the inner circumferential surface of the fixed wrap 51. It comes into contact with the outer circumferential surface of the turning wrap 61 of 60). Accordingly, the starting point of the compression chamber P starts from point C of FIG. 4, so that the capacity of the compression chamber P increases.

In this way, by using a portion of the suction region of the scroll compressor as a compression region to increase the capacity of the compression chamber can not only increase the energy efficiency of the scroll compressor, but also increases the compressor capacity without using a separate bypass hole or pipe. It can be changed to reduce the size of the compressor and to reduce the manufacturing cost.

In addition, since the capacity of the compression chamber can be changed in detail, the capacity-variable operation of the compressor and the refrigeration cycle to which the compressor is applied can be made fine.

Another embodiment of the variable displacement device of the scroll compressor according to the present invention is as follows.

That is, in the above-described embodiment, the valve part is formed in an arc shape and is configured to be detachably attached to the pivoting wrap while rotating. However, in the present embodiment, the valve part is formed in a plate shape and is detachable from the pivoting wrap while performing a linear motion. It is composed.

For example, as shown in FIG. 6, a valve slot 56 penetrating in a radial direction or in an inclined direction is formed in the fixed wrap 51 of the suction groove region (between A and B points), and the valve slot ( The capacity variable valve 90 is slidably inserted into and detached from the outer circumferential surface of the pivoting wrap 61.

The displacement variable valve 90 may be configured such that the valve portion 91 is integrally formed or assembled with the shaft portion 96 of the driving portion 95 to move forward or backward together. Of course, the valve 91 may be separated from the drive unit 95. In this case, a guide groove (not shown) may be further formed in the fixed scroll 50 so that the valve 91 is not separated from its position.

And the front end surface of the valve portion 91, that is, the surface in contact with the outer circumferential surface of the turning wrap 61 is formed in a predetermined curved surface can reduce the wear of the valve portion 91 or the turning wrap 61 is preferable Do.

Since the other configurations and the effects thereof according to the present embodiment as described above are similar to those of the above-described embodiment, a detailed description thereof will be omitted.

The variable capacity apparatus of the scroll compressor according to the present invention may be equally applicable to a high pressure scroll compressor as well as a low pressure scroll compressor as in the above-described embodiments.

Claims (7)

Airtight containers; A fixed scroll fixedly installed inside the sealed container and having a spiral fixed wrap formed therein; And a rotating scroll in which a spiral turning wrap is formed to form two pairs of compression chambers while being engaged with the fixed wrap of the fixed scroll. And a displacement variable valve installed at an inlet side of the compression chamber including the fixed wrap and the swing wrap to vary the suction amount of the refrigerant sucked into the compression chamber. The method of claim 1, The displacement variable valve is a variable displacement device of the scroll compressor that can adjust the interval between the fixed wrap and the swing wrap. The method of claim 2, The displacement variable valve is a scroll compressor consisting of a valve portion rotatably hinged on the inner side of the fixed wrap, and a drive unit installed on one side of the valve portion and added to adjust the distance to the turning wrap by rotating the valve portion. Capacity variable device. The method of claim 3, The valve variable capacity device of the scroll compressor is formed of a flexible plastic material. The method of claim 3, The valve unit is variable capacity of the scroll compressor is formed in the same arc shape as the curvature of the fixed wrap or swing wrap, the one end is hinged to the fixed scroll. The method of claim 2, The displacement variable valve is a valve unit which is movably coupled in a radial direction or an inclined direction of the fixed wrap, installed on one side of the moving direction of the valve portion, the valve portion is added in the radial or inclined direction of the fixed wrap A variable capacity device of a scroll compressor comprising a drive unit. The method of claim 6, The valve unit variable capacity of the scroll compressor is formed in a plate-like shape so that the front end surface in contact with the swing wrap is formed in a curved shape.