JP4222346B2 - Horizontal scroll compressor - Google Patents

Description

  The present invention relates to a horizontal scroll compressor, and more particularly to a horizontal scroll compressor in which a fixed scroll having a mirror plate and a spiral body and a movable scroll are engaged with each other.

  Conventionally, a horizontal scroll compressor used in a refrigeration apparatus is known as disclosed in JP-A-6-66274.

  In this scroll compressor, as shown in FIG. 5, a compression element E in which a fixed scroll FS having a mirror plate and a spiral body and a movable scroll OS are meshed with each other by the spiral bodies is used as one side of a horizontal sealed casing C. A motor housing M that pivots and drives the movable scroll OS on the other side, and a first bearing housing H that supports one end side in the axial direction of the drive shaft S on the compression element E side; Although not shown on the compression element E side, a second bearing housing that supports the other axial end of the drive shaft S is provided, and a suction pipe J is provided in a casing internal space A between the compression element E and the electric motor M. On the other hand, the first bearing housing H is provided with a partition member B made of a flexible material such as rubber and partitioning the suction side of the compression element E with respect to the internal space A. At the top of The inner space A, is provided with a suction passage D in communication with the suction side of the compression element E.

  In FIG. 5, F is a partition wall provided on the back side of the fixed scroll FS to form a discharge chamber G. The discharge chamber G has a discharge port P opened and a discharge pipe K opened. Yes.

  However, the spiral winding end of the fixed scroll FS in the conventional horizontal scroll compressor described above is 180 degrees out of phase with the spiral winding end of the movable scroll OS. The suction ports to the two compression chambers formed between the spiral bodies of the OS are also shifted by 180 degrees.

  Accordingly, when one suction port is positioned at the upper portion of the horizontal casing C, the other suction port is positioned at the lower portion. For this reason, the discharge gas refrigerant discharged from the discharge pipe G to the evaporator of the refrigeration apparatus is supplied. After the defrost operation is performed by flowing the refrigerant, the discharge gas refrigerant discharged from the discharge pipe G is again flowed to the condenser of the refrigeration apparatus, and the refrigeration apparatus is switched from the defrost operation to the normal operation. When a large amount of liquid refrigerant returns, when this liquid refrigerant enters the suction passage D, the liquid refrigerant is sucked from the suction port located at the lower portion, resulting in liquid compression, and a compressor failure such as damage to the spiral body. There was a problem that caused it.

  Further, in the case of starting after a long stop, the liquid refrigerant stagnated in the bottom oil sump Q of the casing C is homed by the activation, and the liquid refrigerant enters the suction passage D by this homing. There was a problem that liquid compression occurred.

  Also, since the height of the other suction port located at the lower part can be raised from the lower part to the middle part by positioning each suction port at the upper and lower middle part of the horizontal casing C, liquid compression can be prevented to some extent. The liquid refrigerant that has entered the suction passage D is directly sucked into the respective suction ports from the suction passage D, so that the above-described problem of liquid compression still remains.

  The object of the present invention is to effectively prevent liquid compression from occurring even when liquid refrigerant stagnates or returns a large amount of liquid, and can easily solve problems such as start-up failure due to liquid compression and damage to the spiral body. There is to be solved by the configuration.

  In order to achieve the above object, the invention described in claim 1 is characterized in that a scroll compression element formed by meshing a fixed scroll having an end plate and a spiral body and a movable scroll between the spiral bodies is provided on one side of the horizontal casing. In a horizontal scroll compressor with an internal motor that drives the orbiting scroll to the other side, and a suction pipe that opens in the casing internal space between the compression element and the motor, the winding end of the spiral body in the fixed scroll Part is extended from the end of the winding to a portion facing the end of winding of the spiral body in the movable scroll, and the suction ports of the two compression chambers formed between the scrolls are brought close to each other. The housing is disposed at the upper part of the casing, and a housing for partitioning the internal space into a compression element side chamber and an electric motor side chamber is provided in the internal space between the compression element and the electric motor. The top of the ring, while providing a suction passage inlet communicates with the suction portion of the compression element side chamber to open, characterized in that an opening of the suction pipe to the motor-side chamber.

  According to a second aspect of the present invention, a scroll compression element formed by meshing a fixed scroll having an end plate and a spiral body and a movable scroll between the spiral bodies is provided in a horizontal casing, and a suction pipe is provided in the internal space of the casing. In the horizontal scroll compressor with an opening, the end of winding end of the spiral body in the fixed scroll is extended from the end of winding end to the portion facing the end of winding end of the spiral body in the movable scroll. The suction ports of the two compression chambers to be formed are placed close to each other, and these suction ports are arranged in the upper part of the casing, and a housing for partitioning the internal space of the casing into one side chamber and the other side chamber is provided. The suction passage is connected to the suction portion of the one-side chamber where the suction port opens, and the suction pipe is opened in the other-side chamber.

  In the first aspect of the present invention, the end of the spiral end of the fixed scroll is extended to make the spiral and the scroll of the movable scroll asymmetrical so that the suction ports are close to each other, and these suction ports are arranged in the upper part of the casing. In addition, since the compression element side chamber whose suction port is opened by the housing is partitioned from the motor side chamber where the suction pipe is opened, and the suction passage is provided at the upper part of this housing, in the case of returning to normal operation after completion of the defrost operation in the refrigeration apparatus As described above, a large amount of liquid refrigerant (hereinafter referred to as liquid refrigerant) returns to the suction pipe, or the liquid refrigerant that has fallen asleep at the time of homing causes liquid refrigerant to enter the compression element side chamber through the suction passage. However, it is possible to effectively prevent the liquid refrigerant from being sucked into the compression chambers from the suction port, and thus the problem due to the liquid compression can be solved. In addition, by making the scrolls of the scrolls asymmetrical, the outer diameter of the scroll (outer diameter of the end plate) can be suppressed and the size can be reduced, but liquid compression can be prevented, and its reliability can be improved.

  According to the second aspect of the invention, the end of the spiral end of the fixed scroll is extended to make the spiral and the scroll of the movable scroll asymmetric so that the suction ports are close to each other, and these suction ports are arranged in the upper part of the casing. In addition, since the one side chamber where the suction port is opened by the housing is partitioned from the other side chamber where the suction pipe is opened and the suction passage is provided in the upper part of the housing, the refrigeration apparatus returns to the normal operation after the defrost operation is completed. Even if a large amount of liquid refrigerant returns to the suction pipe or liquid refrigerant that has fallen in bed at the time of homing and liquid refrigerant enters the one side chamber from the suction passage by this homing, the liquid refrigerant enters the compression chamber from the suction port. It is possible to effectively prevent the refrigerant from being sucked, and therefore, it is possible to solve the problem caused by liquid compression. In addition, by making the scrolls of the scrolls asymmetrical, the outer diameter of the scrolls can be suppressed and the size can be reduced, but liquid compression can be prevented and the reliability can be improved.

  The scroll compressor shown in FIG. 2 includes a fixed scroll 2 having an end plate 2a and a spiral body 2b on one side of a horizontal sealed casing 1, and a movable scroll 3 having an end plate 3a and a spiral body 3b. The scroll compression element E is housed inside, and an electric motor M that drives the movable scroll 3 to turn is housed on the other side, and the drive shaft 5 interlocking with the motor M is fixed to the compression element side in the casing 1. A protruding cylindrical shaft 8 that is supported on the housing 4 via a bearing 6a and protrudes from the back side of the end plate 3a of the movable scroll 3 is provided on an eccentric shaft portion 7 provided at the shaft end portion of the drive shaft 5 via a bearing 6b. In addition, the Oldham ring 9 for preventing rotation is interposed between the end plate 3 a of the movable scroll 3 and the housing 4, and the drive shaft 5 is driven forward by the rotation of the drive shaft 5. The movable scroll 3 is swiveled with respect to the fixed scroll 2, and by this swiveling drive, gas fluid is compressed in the first and second compression chambers A and B formed between the spiral bodies 2 b and 3 b, and the fixed scroll 2. It discharges from the discharge port 10 provided in the center part of the end plate.

  In FIG. 2, 11 is a suction pipe that opens into the casing internal space 12 between the compression element E and the motor M, and 13 is located on the back side of the end plate of the fixed scroll 2. The discharge chamber 14 is partitioned by a fixed partition plate, and the discharge port 10 is opened to the discharge chamber 14 via a discharge valve device 15 provided in the partition plate 13. The tube 16 is opened.

  Reference numeral 17 denotes a demister, 18 denotes an oil return capillary for returning the lubricating oil in the discharge chamber 14 to the motor side chamber 12B, 19 denotes a gas shielding portion provided integrally with the partition plate 13, 20 denotes a capillary guide plate, and 21 denotes the casing 1 It is a mounting leg which attaches to the installation surface GL in inclination.

  Thus, in the embodiment shown in FIG. 1, in the scroll compressor configured as described above, the winding end of the spiral body 2b in the fixed scroll 2 is moved from the winding end to the spiral in the movable scroll 3. Extending approximately 180 degrees to the portion facing the winding end of the body 3b, the suction ports 22 and 23 of the two compression chambers A and B formed between the scrolls 2 and 3 are brought close to each other, and these suction ports 1 are arranged in the upper part of the casing 1 as shown in FIG. 1, and the internal space 12 is defined by the housing 4 provided in the internal space 12 between the compression element E and the electric motor M. , 23 is divided into a compression element side chamber 12A and the suction pipe 11 is opened into an electric motor side chamber 12B, and the suction ports 22, 23 are opened above the housing 4. It provided an intake passage 24 communicating with the intake portion of the reduced element side chamber 12A, and than is the resistive oil return passage 25 is provided between the compression element side chamber 12A and the motor side chamber 12B.

  More specifically, the inner wall surface of the extended portion that extends the end of the scroll of the fixed scroll 2 to the end of the end of the scroll of the movable scroll 3 has the same involute as the other portions or an approximate curve thereof. In addition, the suction volume of the first compression chamber A formed by the spiral inner wall surface of the fixed scroll 2 and the spiral outer wall surface of the movable scroll 3 by the formation of the extended portion is the outer spiral body of the fixed scroll 2. The suction volume of the second compression chamber B formed by the wall surface and the inner wall surface of the spiral body of the movable scroll 3 is increased, and the compression ratio of the first compression chamber A and the compression ratio of the second compression chamber B are different. Therefore, on the spiral winding start side of the movable scroll 3 or the fixed scroll 2, the first and second compression chambers are set so that the discharge start angle of the first compression chamber A is earlier than the discharge start angle of the second compression chamber B. It is provided with-out compression ratio notches for adjusting for adjusting the same compression ratio in B. Further, the housing 4 has a circular outer peripheral surface facing the inner peripheral surface of the casing 1 as shown in FIG. 1, and the suction passage 24 is provided by cutting out the upper portion over a predetermined range. And a small gap a (20 to 30 μm) is provided between the inner peripheral surface of the casing 1 and the resistance oil return passage 25 is formed.

  That is, the outer diameter of the housing 4 is smaller than the inner diameter of the casing 1 so that it can be loosely fitted to the casing 1 and a plurality of welding pins 26 are embedded in the outer peripheral portion as shown in FIG. The housing 1 is provided with a welding hole at a portion facing the mounting portion of the welding pin 26, and the housing 4 that is loosely fitted to the casing 1 is fixed by placing the slight gap a by welding. The resistance oil return passage 25 is formed by the gap a.

  The resistance oil return passage 25 is provided with lubricating oil for supplying oil from the oil supply passage 27 provided in the drive shaft 5 to the thrust receiving surface that supports the end plates 3a of the bearings 6a and 6b and the movable scroll 3, the compression element side chamber 12A, Specifically, it is a narrow oil return passage mainly for returning from the receiving recess 28 of the protruding shaft portion 8 provided in the housing 4 to the motor side chamber 12B, and from the oil reservoir 29 provided at the bottom of the motor side chamber 12B, lubricating oil or liquid refrigerant. This prevents the oil from being accumulated in the receiving recess 28 and preventing the oil from being stirred by the movable scroll 3 while preventing the oil from flowing back.

  When the resistance oil return passage 25 is formed with a small gap a between the casing 1 and the housing 4, the housing 4 can be fixed to the casing 1 by welding using the welding pins 26. The drive shaft 5 can be easily centered. Therefore, it is advantageous in that the oil return passage 25 can be formed and the centering can be easily performed. However, as shown in FIG. Alternatively, although not shown, it may be formed by a notch, and the small gap a and the communication small hole b may be used in combination.

  The suction passage 24 may be provided in the upper part of the casing 1 in accordance with the opening positions of the suction ports 22 and 23 arranged in the upper part of the casing 1, but is preferably shifted in the circumferential direction. In particular, as shown in FIG. 1, it is preferable that the suction ports 22, 23 are shifted to the front in the turning direction of the movable scroll 3 that closes the suction ports 22, 23, that is, to the rear side of the suction ports 22, 23. .

  The suction pipe 11 is opened at the upper part of the electric motor side chamber 12B, and the opening position is preferably shifted in the circumferential direction with respect to the suction passage 24.

  Next, the operation of the embodiment shown in FIG. 1 will be described. As the movable scroll 3 pivots by driving the electric motor M, gas fluid is sucked into the first and second compression chambers A and B from the suction ports 22 and 23, but the fixed scroll 2 Since the spiral bodies 2b and 3b of the movable scroll 3 are asymmetrical and the suction ports 22 and 23 are arranged close to each other and are provided in the upper portion of the casing 1, the size can be reduced as one of the advantages of the asymmetric spiral type. The liquid refrigerant can be prevented from being sucked from the suction ports 22 and 23.

  That is, when applied to a refrigeration system, the liquid refrigerant that has slept during start-up and stoppage homes in the motor-side chamber 12B, or when returning to steady operation after defrost operation, the system side, that is, defrost operation discharge gas. When a large amount of liquid refrigerant returns from the suction pipe 11 to the motor side chamber 12B from the evaporator through which the refrigerant flows, these liquid refrigerants are sucked from the suction ports 22 and 23. In the embodiment of FIG. Since the suction ports 22 and 23 are provided in the upper part of the casing 1, the liquid refrigerant can be prevented from being sucked from the suction ports 22 and 23, and the motor side chamber of the suction pipe 11 can be suppressed. The opening position to 12b is shifted in the circumferential direction with respect to the suction passage 24, and further, the suction passage 24 is shifted to the back side with respect to the suction ports 22 and 23. The gas fluid containing the liquid refrigerant introduced from the suction pipe 11 into the motor side chamber 12B is first circumferentially along the inner peripheral surface of the casing 1 in the motor side chamber 12B, as indicated by the dotted arrow in FIG. Then, the air flows into the compression element side chamber 12A from the suction passage 24 as indicated by the solid line arrow, and then is sucked into the suction ports 22 and 23 by changing the flow direction. The liquid refrigerant is separated in the process of being sucked from the suction ports 22 and 23 through the suction passage 24, and the scattered liquid refrigerant can be prevented from being directly sucked into the suction ports 22 and 23. As a result, the suction Gasified refrigerant is sucked into the ports 22 and 23. Therefore, the liquid compression due to the liquid refrigerant being sucked can be effectively prevented.

  Further, since the lubricating oil supplied to the bearings 6a and 6b and the thrust receiving surface is returned to the motor side chamber 12B through the resistance oil return passage 25, the lubricating oil is accumulated in the receiving recess 28, and the oil by the movable scroll 3 is collected. Stirring can be prevented, the amount of oil rising can be reduced, and liquid refrigerant and lubricating oil can be prevented from flowing back from the oil sump 29.

  Further, since only the suction passage 24 is provided in the housing 4, the rigidity thereof can be improved, and hence the distortion at the thrust receiving surface can be reduced, and the reliability of the compressor can be improved.

FIG. 3 is a cross-sectional view of the housing of the embodiment of the present invention, in which a spiral body portion of a fixed and movable scroll is cut away at a part. FIG. It is a right view of only a housing. It is a fragmentary sectional view which shows another Example. It is a 1 part omission vertical section of a conventional example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Sealed casing, 2 Fixed scroll, 3 Moveable scroll, 4 Housing, 11 Suction pipe, 12 Internal space, 22, 23 Suction port, 24 Suction path, 25 Resistance oil return path

Claims (2)

A scroll compression element (E) formed by meshing a fixed scroll (2) having a head plate and a spiral body and a movable scroll (3) between the spiral bodies is provided on one side of the horizontal casing (1), and the like. An electric motor (M) for rotating the movable scroll (3) is installed on the side, and a suction pipe (11) is opened in a casing internal space (12) between the compression element (E) and the electric motor (M). Horizontal scroll compressor
The end of winding end of the spiral body in the fixed scroll (2) is extended from the end of winding end to a portion facing the end of winding end of the spiral body in the movable scroll (3). ) (3) The two inlets (22) and (23) of the two compression chambers (A) and (B) are brought close to each other, and these inlets (22) and (23) are connected to the upper part of the casing (1). The internal space (12) is partitioned into a compression element side chamber (12A) and a motor side chamber (12B) in the internal space (12) between the compression element (E) and the electric motor (M). A housing (4) is provided, and a suction passage (24) communicating with the suction portion of the compression element side chamber (12A) in which the suction ports (22) and (23) are opened is provided at the top of the housing (4). , The suction pipe in the motor side chamber (12B) Horizontal scroll compressor, characterized in that an opening 11). A scroll compression element (E) formed by meshing a fixed scroll (2) having an end plate and a spiral body and a movable scroll (3) between the spiral bodies is housed in a horizontal casing (1), and the casing (1 In the horizontal scroll compressor in which the suction pipe (11) is opened in the internal space (12) of
The end of winding end of the spiral body in the fixed scroll (2) is extended from the end of winding end to a portion facing the end of winding end of the spiral body in the movable scroll (3). ) (3) The two inlets (22) and (23) of the two compression chambers (A) and (B) are brought close to each other, and these inlets (22) and (23) are connected to the upper part of the casing (1). And a housing (4) for partitioning the internal space (12) of the casing (1) into one side chamber (12A) and the other side chamber (12B). A suction passage (24) communicating with the suction portion of the one side chamber (12A) in which the ports (22) and (23) are opened is provided, and the suction pipe (11) is opened in the other side chamber (12B). Horizontal scroll compressor.

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