JP4081079B2 - Gas backflow prevention device for scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor, and in particular, can prevent a gas compressed by a compression mechanism and discharged to a condenser side through a discharge pipe from flowing backward into the compressor, that is, into a sealed container. The present invention relates to a gas backflow prevention device for a scroll compressor.

  Generally, a compressor converts electric energy into kinetic energy, and compresses refrigerant gas with the kinetic energy. A compressor is a core element that constitutes a refrigeration cycle system, such as a rotary compressor, a scroll compressor, and a reciprocal compressor by a compression mechanism that compresses refrigerant. There are various types. Such compressors are used in refrigerators, air conditioners, showcases and the like.

  The scroll compressor includes an electric mechanism unit that generates a rotational force, and a compression mechanism unit that receives a driving force of the electric mechanism unit, and inhales, compresses, and discharges gas while the orbiting scroll meshes with the fixed scroll and performs the orbiting motion. And.

  FIG. 9 is a cross-sectional view centering on a compression mechanism portion of a general scroll compressor.

  As shown in FIG. 9, the compression mechanism of the scroll compressor includes a sealed container 10 and a fixed scroll mounted in the sealed container 10 at a predetermined interval from the main frame 20 mounted in the sealed container 10. 30, the orbiting scroll 40 positioned between the fixed scroll 30 and the main frame 20 so as to mesh with the fixed scroll 30 so as to be capable of orbiting movement, and the orbiting scroll positioned between the orbiting scroll 40 and the main frame 20. 40, an Oldham ring 50 for preventing rotation, a high-low pressure separating plate 11 coupled to the fixed scroll 30 and the sealed container 10 and separating the inside of the sealed container 10 into a high-pressure region (H) and a low-pressure region (L); A valve assembly 60 that is mounted on the upper surface of the fixed scroll 30 and opens and closes the discharge hole 31 formed in the fixed scroll 30. .

  Further, the orbiting scroll 40 is connected to an eccentric portion 71 of the rotating shaft 70 inserted into the main frame 20.

  A suction pipe 12 for sucking gas is coupled to one side of the sealed container 10 located in the low pressure region (L), and gas is discharged to the other side of the sealed container 10 located in the high pressure region (H). A discharge pipe 13 is coupled.

  Reference numeral 32 denotes a wrap of the fixed scroll 30 protruding and formed in an involute curve shape, reference numeral 41 denotes a wrap of the orbiting scroll 40 protruding to an involute curve shape, and P denotes a compression pocket.

The compression mechanism part of the scroll compressor as described above operates as follows.
First, when the rotary shaft 70 is rotated by receiving the rotational force of the electric mechanism portion, the orbiting scroll 40 coupled to the eccentric portion 71 of the rotary shaft 70 performs a turning motion with reference to the axis of the rotary shaft 70. The orbiting scroll 40 orbits while the rotation is prevented by the Oldham ring 50.

  When the orbiting scroll 40 orbits, the lap 41 of the orbiting scroll 40 meshes with the wrap 32 of the fixed scroll 30 and rotates, so that a plurality of laps 41 of the orbiting scroll 40 and the wrap 32 of the fixed scroll 30 are formed. The individual compression pockets (P) move to the center of the fixed scroll 30 and the orbiting scroll 40, and at the same time, the gas in the compression pockets (P) is compressed while the volume changes. The gas compressed in the compression pocket (P) is discharged through the discharge hole 31 of the fixed scroll 30.

  The high-temperature and high-pressure gas discharged through the discharge hole 31 of the fixed scroll 30 is discharged to the outside of the sealed container 10 through the discharge pipe 13 through the high-pressure region (H) of the sealed container 10. The high-temperature and high-pressure gas flowing out through the discharge pipe 13 of the scroll compressor flows to the condenser (not shown) connected to the discharge pipe 13.

  On the other hand, a refrigeration cycle system including the scroll compressor is mainly mounted on an air conditioner. In such a refrigeration cycle system, the high-temperature and high-pressure refrigerant gas discharged from the compressor passes through the condenser, the capillary tube, and the evaporator by the operation of the compressor.

  However, the scroll compressor as described above is discharged to the condenser side through the discharge pipe 13 connected to the sealed container 10 of the scroll compressor when the refrigeration cycle system including the scroll compressor stops during operation. The gas flowing back flows into the sealed container 10. As a result, there is a problem that the compression efficiency is reduced when the scroll compressor is restarted.

  The present invention is for solving the above-described problems, and an object of the present invention is to compress the gas compressed by the compression mechanism and discharged to the condenser side through the discharge pipe inside the compressor. That is, an object of the present invention is to provide a gas backflow prevention device for a scroll compressor that can prevent backflow into a sealed container.

  In order to achieve such an object of the present invention, a gas backflow prevention device for a scroll compressor according to the present invention is fixedly coupled to a sealed container provided with a discharge pipe for discharging gas, and the sealed container. A fixed scroll that engages with the fixed scroll, and orbiting scroll that compresses gas together with the fixed scroll while rotating, and backflow prevention means that prevents the gas discharged through the discharge pipe from flowing back. It is characterized by comprising.

  The gas backflow prevention device for a scroll compressor according to the present invention is configured such that the gas compressed by the orbiting motion of the fixed scroll 30 and the orbiting scroll 40 is smoothly discharged to the discharge pipe 13 through the sealed container 10 during operation. In addition, when the operation is stopped, the gas discharged to the discharge pipe 13 is prevented from flowing back into the sealed container 10, so that a decrease in the compression efficiency can be prevented during the re-operation, and the compression efficiency can be increased. effective.

  Hereinafter, a gas backflow prevention device for a scroll compressor according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of a compression mechanism portion of a scroll compressor according to an embodiment of a gas backflow prevention device for a scroll compressor of the present invention. The same parts as those in the prior art are given the same reference numerals.

  As shown in FIG. 1, the scroll compressor includes a sealed container 10, a fixed scroll 30 mounted in the sealed container 10 at a predetermined interval from the main frame 20 mounted in the sealed container 10, The orbiting scroll 40 positioned between the fixed scroll 30 and the main frame 20 so as to mesh with the fixed scroll 30 so that the orbiting movement is possible, and the orbiting scroll 40 positioned between the orbiting scroll 40 and the main frame 20 is rotated. The Oldham ring 50 for preventing, the high and low pressure separating plate 11 coupled to the fixed scroll 30 and the sealed container 10 to separate the inside of the sealed container 10 into the high pressure region (H) and the low pressure region (L), and the fixed scroll 30 And a valve assembly 60 that is mounted on the upper surface and opens and closes the discharge hole 31 formed in the fixed scroll 30.

  Further, the orbiting scroll 40 is connected to an eccentric portion 71 of the rotating shaft 70 inserted into the main frame 20.

A suction pipe 12 for sucking gas is coupled to one side of the sealed container 10 located in the low pressure region (L), and gas is discharged to the other side of the sealed container 10 located in the high pressure region (H). A discharge pipe 13 is coupled.
The above configuration is the same as that of the prior art.

  Furthermore, backflow prevention means for preventing the gas discharged through the discharge pipe 13 from flowing back into the sealed container 10 is provided.

  The backflow prevention means opens and closes the discharge pipe 13 by the difference between the pressure in the sealed container 10 and the pressure in the discharge pipe 13.

  As shown in FIGS. 2 and 3, the backflow preventing means forms a predetermined-shaped internal flow path and is fixedly coupled in the sealed container 10 so that the internal flow path communicates with the discharge pipe 13. 80 and a check valve 90 that is movably inserted into the valve housing 80 and opens and closes the internal flow path due to a pressure difference.

  The valve housing 80 is formed in a cylindrical shape having a fixed length and an inner diameter, and a cylindrical portion 81 whose one side is coupled to the inner wall of the sealed container 10 and a cover surface portion 82 that covers the other side of the cylindrical portion 81. And a through hole 83 that is formed through the cover surface portion 82 and is opened and closed by the check valve 90.

  It is desirable that the inner diameter of the cylindrical portion 81 is larger than the inner diameter of the discharge pipe 13, and the inner diameter of the through hole 83 is the same as the inner diameter of the discharge pipe 13.

  The check valve 90 has an opening / closing portion 91 having a predetermined area, and is bent and extended to a predetermined length on the outer peripheral surface of the opening / closing portion 91 so as to contact the inner wall of the valve housing 80 and at a predetermined interval from the inlet side of the discharge pipe 13. And an interval maintaining unit 92 for maintaining the above.

  The opening / closing part 91 is formed in a disk shape having a certain thickness, and has an outer diameter larger than the inner diameter of the through hole 83 and smaller than the cover surface part 82. The number of the interval maintaining units 92 is preferably three, and the interval is preferably constant.

  The valve housing 80 is coupled so that the end surface of the cylindrical portion 81 is in contact with the inner wall of the sealed container 10, and the inlet side of the discharge pipe 13 is positioned inside the cylindrical portion 81. A sealing member (not shown) is preferably inserted between the valve housing 80 and the inner wall of the sealed container 10. The inside of the valve housing 80 and the through hole 83 define an internal flow path.

  The check valve 90 is inserted into the valve housing 80 such that the interval maintaining portion 92 is positioned on the inner wall side of the sealed container 10 and the opening / closing portion 91 is positioned on the cover surface portion 82. At this time, the side surface of the interval maintaining portion 92 is slidably contacted with the inner peripheral wall of the cylindrical portion 81.

  In the modified example of the valve housing 80 and the check valve 90, as shown in FIGS. 4 and 5, two interval maintaining portions 92 are formed in the check valve 90, and a constant height is formed on the inner peripheral wall of the cylindrical portion 81 of the valve housing 80. A guide protrusion 84 having a length and a length is formed. The same parts as those in FIGS. 2 and 3 are given the same reference numerals.

  As described above, the valve housing 80 is coupled to the inner wall of the sealed container 10, and the check valve 90 is located inside the cylindrical portion 81 of the valve housing. At this time, the two interval maintaining portions 92 of the check valve 90 are slidably contacted with the inner peripheral wall of the cylindrical portion 81, and the outer peripheral surface of the opening / closing portion 91 of the check valve 90 slides on the inner surface of the guide projection 84 of the valve housing. Touched movably. Since the two spacing maintaining portions 92 of the check valve 90 are contacted and supported by the inner peripheral wall of the cylindrical portion 81 of the valve housing, the guide projection 84 of the valve housing 80 and the outer peripheral surface of the opening / closing portion 91 are in contact with each other. The valve housing 80 is supported at three points to be in a stable coupled state.

  As another embodiment of the present invention, as shown in FIG. 6, a cover 100 covering the discharge hole 31 of the fixed scroll 30 is coupled to the upper surface of the fixed scroll 30, and the chamber 101 is formed by the upper surface of the cover 100 and the fixed scroll 30. It is formed. Further, the discharge pipe 13 is coupled to the cover 100 so as to penetrate the sealed container 10 and communicate with the chamber 101. Further, the backflow prevention means is mounted in the cover 100 so as to communicate with the discharge pipe 13. As described above, the backflow preventing means includes the valve housing 80 coupled to the inner wall of the cover 100 and the check valve 90 movably inserted into the valve housing 80. Specific shapes of the valve housing 80 and the check valve 90 are as described above.

  Reference numeral 32 denotes a wrap of the fixed scroll 30 protruding and formed in an involute curve shape, reference numeral 31 denotes a wrap of the orbiting scroll 40 protruding to an involute curve shape, and P denotes a compression pocket.

  Hereinafter, the effect of the gas backflow prevention device of the scroll compressor of the present invention will be described.

  As to the operation of the scroll compressor, first, as described above, when the rotary shaft 70 is rotated by receiving the rotational force of the electric mechanism portion, the orbiting scroll 40 coupled to the eccentric portion 71 of the rotary shaft 70 is rotated. Swivel around the axis of When the orbiting scroll 40 orbits, the lap 41 of the orbiting scroll 40 meshes with the wrap 32 of the fixed scroll 30 and compresses the gas while orbiting, and the compressed high-temperature and high-pressure gas is discharged from the fixed scroll 30. It is discharged to the high pressure region (H) of the sealed container 10 through the hole 31.

  The gas discharged to the high pressure region (H) of the sealed container 10 is discharged to the outside of the sealed container 10 through the discharge pipe 13.

  On the other hand, when the high-temperature and high-pressure gas is discharged to the high-pressure region (H) of the sealed container 10 through the discharge hole 31 of the fixed scroll 30, the pressure of the high-pressure region (H) of the sealed container 10 is relatively high. Thus, the check valve 90 located in the valve housing 80 is slid and moved toward the discharge pipe 13 as shown in FIG. At this time, the interval maintaining portion 92 of the check valve 90 is slid along the inner peripheral wall of the valve housing 80. The check valve 90 is positioned in a state in which the gap maintaining unit 92 is supported by the inner wall of the sealed container 10 due to the high pressure in the sealed container 10, and thereby the opening / closing unit 91 of the check valve 90 and the inlet of the discharge pipe 13. A constant interval is maintained between Therefore, the gas in the sealed container 10 flows into the valve housing 80 through the through hole 83 of the valve housing 80, and the gas that has flowed in is between the opening / closing portion 91 of the check valve 80 and the inlet of the discharge pipe 13. It flows into the discharge pipe 13 through the interval.

  The high-temperature and high-pressure gas flowing out through the discharge pipe 13 of the scroll compressor passes through the capillary and the evaporator.

  On the other hand, when the operation of the scroll compressor is stopped, the orbiting scroll 40 meshing with the fixed scroll 30 and turning is stopped, so that the discharge through the discharge hole 31 of the fixed scroll 30 to the high pressure region (H) of the sealed container 10 is performed. Since the gas to be discharged is stopped, the pressure in the high-pressure region (H) of the hermetic container 10 is relatively lower than the pressure of the gas discharged through the discharge pipe 13, so that the gas is discharged through the discharge pipe 13. Gas flows backward. However, as the pressure in the sealed container 10 becomes lower than the internal pressure of the discharge pipe 13, the check valve 90 located in the valve housing 80 moves to the cover surface portion 82 side of the valve housing 80 as shown in FIG. The opening / closing part 91 of the check valve 90 closes the through hole 83 formed in the cover surface part 82. As a result, the gas discharged to the discharge pipe 13 can be prevented from flowing back into the sealed container 10.

  As another embodiment of the present invention, when the cover 100 is coupled to the upper surface of the fixed scroll 30, the chamber 101 formed by the cover 100 and the upper surface of the fixed scroll 30 becomes the high pressure region (H) of the sealed container 10. Therefore, the gas discharged through the discharge hole 31 of the fixed scroll 30 flows through the chamber 101 to the discharge pipe 13. The backflow prevention means provided in the chamber 101 operates as described above to prevent the backflow of gas.

It is sectional drawing of the compression mechanism part of a scroll compressor provided with the gas backflow prevention apparatus of the scroll compressor of one Embodiment of this invention. It is a sectional side view showing one embodiment of the gas backflow prevention device of the scroll compressor of the present invention. It is a sectional front view showing one embodiment of the gas backflow prevention device of the scroll compressor of the present invention. It is a cross-sectional side view which shows the other modification of the valve housing which comprises the gas backflow prevention apparatus of the scroll compressor of this invention, and a check valve. It is a cross-sectional front view which shows the other modification of the valve housing which comprises the gas backflow prevention apparatus of the scroll compressor of this invention, and a check valve. It is sectional drawing which shows other embodiment of the gas backflow prevention apparatus of the scroll compressor of this invention. It is sectional drawing which shows the operation state of the gas backflow prevention apparatus of the scroll compressor of this invention. It is sectional drawing which shows the operation state of the gas backflow prevention apparatus of the scroll compressor of this invention. It is sectional drawing which shows the compression mechanism part of the scroll compressor of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sealing container 13 Discharge pipe 30 Fixed scroll 40 Orbiting scroll 80 Valve housing 81 Cylindrical part 82 Cover surface part 83 Through-hole 84 Guide protrusion 90 Check valve 91 Opening / closing part 92 Spacing maintenance part 100 Cover 101 Chamber

Claims (11)

A sealed container provided with a discharge pipe through which gas is discharged;
A fixed scroll fixedly coupled within the sealed container;
A orbiting scroll that compresses gas together with the fixed scroll while meshing with the fixed scroll; and
A cylindrical portion that is formed in a cylindrical shape and has one side coupled to the inner wall of the hermetic container so as to surround the portion of the discharge pipe, and a through hole is formed inside the cylindrical portion that covers the other side of the cylindrical portion. A valve housing comprising a cover surface portion and a guide projection formed on an inner wall of the cylindrical portion and having a certain height and length;
A gas backflow prevention device for a scroll compressor, comprising: a check valve that is movably inserted into the valve housing and opens and closes the internal flow path by a pressure difference . 2. The gas backflow prevention device for a scroll compressor according to claim 1 , wherein the check valve includes an interval maintaining unit that maintains a constant interval from an inlet side of the discharge pipe. The inner diameter of the through hole, the gas backflow prevention device of a scroll compressor according to claim 1, characterized in that the same as the inner diameter of the discharge pipe. The inner diameter of the cylindrical portion, the gas backflow prevention device of a scroll compressor according to claim 1, wherein the greater than the inner diameter of the discharge pipe. A sealed container provided with a discharge pipe through which gas is discharged;
A fixed scroll fixedly coupled within the sealed container;
A orbiting scroll that compresses gas together with the fixed scroll while meshing with the fixed scroll; and
A valve housing fixedly coupled to the hermetic container so that an internal flow path of a predetermined shape is formed and the internal flow path communicates with the discharge pipe;
An opening / closing portion having a predetermined area, and an interval maintaining portion which is formed to bend and extend to the outer peripheral surface of the opening / closing portion so as to be in contact with the inner wall of the valve housing and maintain a constant interval from the inlet side of the discharge pipe; the provided and movably inserted and scroll compressor of the gas backflow prevention device, characterized by comprising a check valve for opening and closing the internal flow path by a pressure difference inside the valve housing. The gas backflow prevention device for a scroll compressor according to claim 5 , wherein a space in which a gas flows is formed between the gap maintaining portions. The gas backflow prevention device for a scroll compressor according to claim 5 or 6 , wherein the number of the interval maintaining units is two. The gas backflow prevention device for a scroll compressor according to claim 5 or 6 , wherein the interval maintaining unit is three. The gas backflow prevention device for a scroll compressor according to any one of claims 5 to 8 , wherein the interval maintaining units maintain a constant interval with each other. The valve housing has a cover surface portion in which a through hole is formed,
The scroll compressor according to any one of claims 5 to 9 , wherein the opening / closing part is formed in a disk shape having a constant thickness, and an outer diameter is larger than an inner diameter of the through hole. Gas backflow prevention device. A cover for covering the discharge hole of the fixed scroll is provided on the upper surface of the fixed scroll, a chamber is formed in the cover , the discharge pipe is coupled to the cover so as to communicate with the chamber, the valve housing and the check valve gas backflow prevention device of a scroll compressor according to claim 1 or 5, characterized in that provided in the cover.

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