KR20100017008A - Scroll compressor - Google Patents

Abstract

A scroll compressor according to the present invention. In the scroll compressor of the present invention, a plurality of bypass holes for bypassing a part of the refrigerant compressed in the compression chamber to the fixed scroll are connected to one intermediate pressure chamber, and one bypass valve is provided at the outlet of the intermediate pressure chamber. By installing, the production cost can be reduced by simplifying the capacity variable device and miniaturizing the compressor. In addition, since the plurality of bypass holes are arranged to communicate with each other in the intermediate pressure chamber, the plurality of bypass holes can be easily controlled with only one bypass valve. In addition, by installing a check valve in the bypass hole, it is possible to prevent the occurrence of a dead volume in the process of varying the capacity of the scroll compressor to increase the compressor performance.

Description

Scroll Compressor {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 a portion of the medium pressure refrigerant to 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. The production cost may increase, and the plurality of bypass holes arranged at a relatively long distance must be controlled at the same time, so that the control is not easy and reliability may be deteriorated, and the amount of refrigerant bypassed in each bypass hole may There was a problem in that it is not constant to precisely control the variable capacity of the compressor. 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.

The present invention solves the problems of the conventional scroll compressor as described above, while varying the capacity of the compressor using a bypass hole, the number of valves for controlling the same can be reduced, reliability can be increased, and It is an object of the present invention to provide a scroll compressor capable of precisely controlling the capacity of the compressor by keeping the amount constant and reducing the production cost while miniaturizing the compressor by simplifying piping.

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 to form a pair of compression chambers, wherein the fixed scroll has at least one in communication with the outside of the compression chamber. At least one bypass hole is formed, an intermediate pressure chamber is formed at an outlet side of the bypass hole to have a cross-sectional area larger than that of the bypass hole, and a check valve is provided at the intermediate pressure chamber to open and close the bypass hole. There is provided a scroll compressor.

The scroll compressor according to the present invention includes an intermediate pressure chamber configured to form a plurality of bypass holes for bypassing a part of the refrigerant compressed in the compression chamber in the fixed scroll, and the outlet ends of the plurality of bypass holes communicate with each other. It is formed on the upper surface of the fixed scroll and by installing one bypass valve at the outlet of the intermediate pressure chamber can simplify the variable capacity device and thereby reduce the production cost while miniaturizing the compressor. In addition, since the plurality of bypass holes are arranged to communicate with each other in the intermediate pressure chamber, the plurality of bypass holes can be easily controlled with only one bypass valve, thereby reducing the number of the bypass valves, thereby reducing the production cost. In addition to savings, a single bypass valve allows for variable capacity for easy and accurate control. In addition, by installing a check valve in the bypass hole, it is possible to prevent the occurrence of a dead volume in the process of varying the capacity of the scroll compressor to increase the compressor performance.

Hereinafter, the scroll compressor according to the present invention will be described in detail with reference to the embodiments 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. And a check valve 80 for opening and closing a bypass hole to be described later, and one side of the main frame 20. Installed, and a bypass valve 90 for varying the compressor operation mode.

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. The gas discharge pipe (DP) is coupled to communicate with the discharge space (S2) through the upper cap (12).

As shown in FIG. 1, the fixed scroll 50 is formed in a spiral fixed wrap 51 so as to form a pair of compression chambers in engagement with a swing wrap of a spiral scroll formed in a spiral shape. The suction groove 52 is formed on the outer side, and the discharge port 53 is formed on the center side of the fixing wrap 51. The fixed wrap 51 may be formed so that the winding direction length of the fixed wrap 51 is substantially the same as the winding direction length of the turning wrap 61 to be described later so that both compression chamber (P) can be formed at the same time, In some cases, it may be formed as long or short as the phase difference of about 180 degrees with the length of the winding direction of the turning wrap 61.

In addition, a plurality of bypass holes 54 are formed at equal intervals along the circumferential direction so as to communicate with each other in the middle of the fixing wrap 51, that is, between the middle fixing wrap, from the inside of the compression chamber P to the outside. At the outlet of the bypass holes 54, that is, the upper surface of the fixed scroll 50, an arc-shaped intermediate pressure chamber 55 is engraved with a predetermined depth. The bypass holes 54 are formed to be received together in the intermediate pressure chamber. The bypass holes 54 may be formed at equal intervals along the circumferential direction, but have a phase difference of about 180 ° along the trajectory of the orbiting scroll 60 so as to communicate with each of the compression chambers P, respectively. It may be formed. The bypass holes 54 may be formed as holes having a circular cross section, or may be formed as long holes having an arc cross section as shown in FIG. 2. It may be formed in other shapes.

And the upper surface of the fixed scroll 50 is provided with a cover plate 56 to cover the arc-shaped intermediate pressure chamber 55. The cover plate 56 may be formed in a disk shape as shown in FIG. 2 or may be formed in an arc shape or an annular shape to cover the intermediate pressure chamber 55.

The check valve 80 may be provided in plurality so as to correspond to each of the bypass holes 54. For example, as shown in FIGS. 2 and 3, one end of the check valves 80 is fixed to the upper surface of the fixed scroll 50, that is, the upper surface of the intermediate pressure chamber 55, and the other end thereof is free. A plurality of valves 81 for opening and closing the bypass holes 54, and a plurality of retainers installed on the compression back of the plurality of valves 81 to limit the opening amount of each valve 81 Consists of 82.

2 and 3, the suction space S1 of the airtight container 10 passes through the fixed scroll 50 at the outer circumferential surface or the bottom of the intermediate pressure chamber 55 at the edge of the fixed scroll 50. One communication hole 58 is formed so as to communicate with each other. The communication hole 58 is radially penetrated in the middle of the communication hole 58, and the bypass valve 80 is mounted so that the bypass valve 80 is connected to the communication hole. A valve hole 59 for opening and closing the 58 is formed. It is preferable to form only one communication hole 58 to reduce the number of bypass valves 80. However, in some cases, a plurality of communication holes 58 may be formed.

The bypass valve 90 is composed of a solenoid valve to selectively bypass the medium pressure refrigerant in the intermediate pressure chamber 55 to the suction space S1 of the sealed container 10. That is, the bypass valve 90 is inserted into the valve hole 59 so that the opening / closing portion (unsigned) can open and close the communication hole 58 when the power is applied. And a power terminal (not shown) for applying power to the bypass valve 80 may be installed in the sealed container (10).

In the figure, 21 is a through hole, 41 is a stator, 42 is a rotor, 43 is a drive shaft, 56a is a discharge hole, and 57 is a check valve.

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 As the seal P moves to the center by the continuous turning motion of the turning scroll 60, the volume decreases, the suction gas is sucked and compressed, and then discharged into the discharge space S2, through the gas discharge pipe DP. Discharged by refrigeration cycle.

Here, the bypass valve 90 is operated according to the operation mode of the compressor to change the capacity of the compressor.

For example, when the compressor operates in the saving mode, power is applied to the bypass valve 90 as shown in FIG. 4 so that the bypass valve 90 opens the communication hole 58. As a result, the check valve 80 opens, and the refrigerant in the compression chamber P passes through the plurality of bypass holes 54, the intermediate pressure chamber 55, and the communication hole 58 and the main frame of the fixed scroll 50. The through-hole 21 of the bypass to the suction space (S1) of the sealed container 10 to achieve the suction pressure, thereby the compressor does not work or less work than the power mode. At this time, the valve 81 of the check valve 80 is lowered in the compression back pressure is opened by the compressed refrigerant in the compression chamber (P).

On the other hand, when the compressor operates in the power operation mode, power is not applied to the bypass valve 80 as shown in FIG. 5 so that the bypass valve 80 keeps the communication hole 58 blocked. . Accordingly, the intermediate pressure chamber 55 maintains a state in which the medium pressure refrigerant is filled, but is not bypassed into the suction space S1 of the sealed container 10 that achieves the suction pressure, so that the refrigerant in the compression chamber P is not. Is compressed while constantly moving.

At this time, as the bypass valve 90 is closed, the communication hole 58 and the intermediate pressure chamber 55 remain closed, and the communication hole 58 and the inside of the intermediate pressure chamber 55 are closed. The pressure state in which the pressure is higher than the pressure in the compression chamber P is maintained. Accordingly, it is possible to prevent the refrigerant compressed in the compression chamber P from leaking into the intermediate pressure chamber 55 without being leaked into the medium pressure chamber 55, thereby reducing the performance of the scroll compressor. This can be improved.

On the other hand, there are other embodiments of the check valve in the scroll compressor according to the present invention are as follows.

First, the check valve may be formed in one piece. For example, as shown in FIG. 6, the valve 181 is formed in an arc shape, and is fixed to the bottom surface of the intermediate pressure chamber 55, and the middle of the fixing part 185, that is, the bypass. It may be made of openings and closing parts 186 cut in portions corresponding to the holes 54. The openings 186 are formed to face each other toward the communication hole as shown in FIG. 6, so that the refrigerant may be quickly bypassed into the suction space.

Next, in the above-described embodiments, the check valve is formed in a cantilever shape in which one end is fixed, but the present embodiment may be formed in a piston shape as shown in FIGS. 7 and 8. For example, a valve groove 54a of a predetermined depth is formed at an outlet end of the bypass hole 54 of the fixed scroll 50, and the piston valve 281 slides in the valve groove 54a, thereby bypassing the bypass. It is inserted to open and close the hole 54. In addition, a coolant guide groove 54b may be formed on an inner circumferential surface of the valve groove 54a so that the coolant passing through the bypass hole 54 may quickly leak into the intermediate pressure chamber 55. The refrigerant guide groove 54b may be formed to be inclined as shown in FIG. 8, but may be formed to be grooved by a predetermined depth in the direction of movement of the piston. The upper end of the piston valve 281 is a valve spring 282 for adding an elastic force so that the piston valve 280 closes quickly when the operation mode of the compressor is changed, that is, when switching from the saving mode to the power mode. This can be installed. The operation and effect thereof is similar to that of the check valve of the cantilever type described above, and thus a detailed description thereof will be omitted.

On the other hand, if there is another embodiment of the scroll compressor according to the present invention.

That is, in the above-described embodiment, the fixed wrap 51 of the fixed scroll 50 and the swing wrap 61 of the swing scroll 60 are formed in a symmetrical shape, but in some cases, the fixed wrap 51 It is also possible to form a so-called asymmetrical shape in which the length of the turning wrap 61 and the winding direction are different. For example, the fixed wrap 51 of the fixed scroll 50 has a wound direction length of the fixed wrap 51 so that both compression chambers P can be formed at the same time than the wound direction length of the turning wrap 61. It may be formed longer to have a phase difference of 180 degrees. In this case, a plurality of bypass holes 54 may be formed in substantially the same line or in a range of ± 45 ° in the middle of the fixing wrap 51, that is, between the fixing plates between the intermediate fixing wraps. . Accordingly, the intermediate pressure chamber 55 may be formed in one circular or radial arc shape so that the plurality of bypass holes 54 may be accommodated together. Other configurations and operation effects thereof are similar to those of the above-described embodiment, and thus a detailed description thereof will be omitted.

In this way, the capacity of the scroll compressor can be varied, thereby simplifying the apparatus for varying the capacity of the compressor, thereby providing an inexpensive and reliable scroll variable capacity apparatus. In addition, by installing a check valve in the bypass hole, it is possible to increase the performance of the compressor by preventing the occurrence of a dead volume in the process of varying the capacity of the scroll compressor.

Meanwhile, in the above-described embodiments, the low pressure scroll compressor has been described, but in some cases, as shown in FIG. 9, the same may be applied to the high pressure scroll compressor in which the inner space of the closed container achieves the discharge pressure. In this case, as the inner space of the sealed container 10 forms the discharge pressure, the electromagnet of the bypass valve 80 may be adversely affected in performance in the high pressure atmosphere. Therefore, in this case, the intermediate pressure chamber 55 for accommodating the bypass hole 54 and the bypass hole 54 is formed in the fixed scroll 50, and is connected to the intermediate pressure chamber 55 to seal the seal. The bypass pipe 100 extending to the outside of the container 10 may be connected to the gas suction pipe SP, and the bypass valve 80 may be installed at the outside of the sealed container 10. Other configurations and operation effects thereof are similar to those of the above-described embodiments, and thus a detailed description thereof will be omitted. In this case, however, even when the solenoid valve with low reliability at high temperature is used as the bypass valve, the bypass valve operates at low temperature, thereby improving reliability of the variable capacity operation of the compressor.

The scroll compressor of the present invention is mainly applied to an air conditioner, but may be widely used in a refrigeration apparatus using a refrigeration cycle.

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

Figure 2 is an exploded perspective view showing a fixed scroll from the upper side in the scroll compressor according to Figure 1,

3 is a longitudinal sectional view showing a main part of the scroll compressor according to FIG. 2;

4 and 5 are longitudinal cross-sectional view showing the operating state of the bypass device during power operation and saving operation in the scroll compressor according to FIG.

6 is a perspective view showing another embodiment of the check valve in the scroll compressor according to FIG.

7 and 8 are a perspective view and a longitudinal sectional view showing another embodiment of the check valve in the scroll compressor according to FIG.

Figure 9 is a longitudinal sectional view showing an example of the high-pressure scroll compressor of the present invention.

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

10: casing 50: fixed scroll

51: fixed wrap 52: suction groove

53: discharge port 54: bypass hole

54a: valve groove 54b: refrigerant guide groove

55 medium pressure chamber 56 cover plate

58: communication hole 59: valve hole

60: turning scroll 61: turning wrap

80: check valve 81: valve

82: Retainer 90: Bypass Valve

180: check valve 181: valve

182: retainer 185: fixing part

186: opening and closing part 280: check valve

281: piston valve 282: valve spring

Claims (13)

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. The fixed scroll is formed with at least one bypass hole communicating from the inside of the compression chamber to the outside, the intermediate pressure chamber is formed on the outlet side of the bypass hole to have a cross-sectional area larger than the cross-sectional area of the bypass hole, And a check valve for opening and closing the bypass hole in the pressure chamber. The method of claim 1, The plurality of bypass holes are formed, and the plurality of check valves are provided to open and close the plurality of bypass holes, respectively. The method of claim 2, One end of the check valve is formed as a fixed end and the other end is formed as a free end scroll compressor consisting of a cantilever type valve for opening and closing the bypass hole while the free end rotates around the fixed end. The method of claim 2, The check valve is a scroll compressor consisting of a piston valve for opening and closing the bypass hole while sliding. The method of claim 4, wherein And a refrigerant guide groove formed on an inner circumferential surface of the bypass hole. The method of claim 1, A plurality of the bypass hole is formed, the check valve is provided with one scroll compressor for opening and closing the plurality of bypass holes together. The method of claim 6, The check valve is integrally formed with one fixed portion fixed to the intermediate pressure chamber, and a scroll compressor consisting of a plurality of opening and closing portions are formed in the fixed portion to correspond to each bypass hole. The method of claim 1, A plurality of bypass holes are formed so as to communicate with each of the two compression chambers, and the intermediate pressure chamber is formed to accommodate a plurality of bypass holes together. The method of claim 8, And the bypass hole has a phase difference of approximately 180 ° along the circumferential direction. The method of claim 8, And the bypass hole is formed in substantially the same line along the radial direction. The method of claim 1, One communication hole is formed at one side of the intermediate pressure chamber so that the intermediate pressure chamber communicates with a portion forming the suction pressure, and the communication hole has a control valve for selectively opening and closing the communication hole to switch the mode of the compressor. Scroll compressor installed further. The method of claim 1, The inner space of the sealed container is divided into a suction space and a discharge space, the suction space is in communication with the suction pipe while the discharge space is in communication with the discharge tube scroll compressor. The method of claim 1, And an inlet side of the compression chamber communicates with a suction pipe, and an inner space of the sealed container communicates with a discharge pipe.

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