JP2007051556A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor capable of coping with a wide operation mode by reducing a leakage loss and a motor loss by increasing an operation frequency by reducing the volume in a low speed operation area, while reducing a mechanical loss by reducing the operation frequency by increasing the volume in a high speed operation area, without changing the size of a compressor body. <P>SOLUTION: This scroll compressor can be efficiently operated over a wide range of large capacity from small capacity by reducing the apparent suction shutting-up volume by returning fluid in the middle of compression to a suction chamber 13 from an intermediate hole 24a of a bypass 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll compressor used for an air conditioner, a refrigerator, a blower, a water heater, and the like.

  Conventionally, with the diversification of operation modes, there has been a demand for a wide range of operation from large capacity operation with large capacity to small capacity operation with small capacity. In general, mechanical loss increases with high speed operation. On the other hand, by operating at low speed, fluid leakage increases, volumetric efficiency deteriorates, and motor efficiency tends to deteriorate. When the suction volume is increased, the operating frequency is lowered to obtain the same capacity, so the mechanical loss is reduced and the performance in the high-speed operating area is improved, but conversely the performance in the low-speed operating area is the fluid leakage loss and the motor. Deteriorated by increased loss. In addition, when the suction volume is reduced, the operating frequency is increased to obtain the same capacity, so the performance in the low-speed operating area is improved by reducing fluid leakage loss and motor loss, but conversely the performance in the high-speed operating area. Is exacerbated by increased mechanical losses. Therefore, it has been demanded to increase the suction volume in the high speed operation region and further reduce the suction volume in the low speed operation region.

FIG. 8 shows a conventional scroll compressor described in Patent Document 1. In FIG. As shown in FIG. 8, at least one of the orbiting scroll blade and the fixed scroll blade is provided with an extension blade further extending along the spiral shape from the end position of the winding, and the inner wall of this extension blade and the other blades facing this At least one of the outer walls of the blade is a displacement surface that is displaced in the direction in which the thickness of the blade becomes thinner, and a constant gap is formed between the displacement surface and the wall surface of the other blade facing the blade even when it is closest. The clearance allows the suction refrigerant present in the extension blade part to escape to the end of winding during low speed operation, and the compression chamber without releasing most of the suction fluid present in the extension blade part to the end of winding during high speed operation. It is possible to accommodate a wide range of operation modes since the volume of the suction fluid is changed in a pseudo manner.
JP-A-11-82331

  However, in the conventional configuration, oil lubrication is performed in a slight gap between the displacement surface that is displaced in a direction in which the thickness of the blade becomes thinner and the other blade wall surface facing the blade surface in each operating condition from low speed to high speed. Even under the same operating conditions, there are differences in the amount of oil, viscosity, etc., and a constant sealing performance cannot be obtained for each operating condition, and the amount of the trapped suction fluid that escapes at the end of winding can be determined at each operating condition. It is impossible to obtain the desired volume, and it is necessary to cope with further diversification of operation modes.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a scroll compressor that can be operated efficiently over a wide range from a small capacity to a large capacity by changing the volume.

In order to solve the above-mentioned conventional problems, the scroll compressor according to the present invention allows a fluid in the middle of compression to escape to the suction chamber by a bypass communicating the compression space and the suction chamber, and an intermediate hole and a suction port are disposed at the end of the bypass. The intermediate hole is located on at least one of the end plate of the fixed scroll or on the support disc of the orbiting scroll, and faces only one of the pair of compression spaces, The intermediate hole on the end plate of the fixed scroll has a position and a size that can be completely covered by the orbiting scroll wrap thickness, and the intermediate hole on the support disk of the orbiting scroll is the fixed scroll. The trapped fluid escapes to the suction chamber by a certain amount for each operating condition by being at a position and size that can completely block a certain section with the lap thickness. Doo is possible, it is possible to operate efficiently over a wide range of large capacity from a small capacity can accommodate a variety of additional operation mode.

  The scroll compressor of the present invention can be efficiently operated over a wide range from a small capacity to a large capacity by changing the volume.

  In the first aspect of the present invention, the involute wrap forming a part of the orbiting scroll is arranged on the support disk in contrast to the spiral involute fixed scroll wrap formed upright on one surface of the end plate forming a part of the fixed scroll. The orbiting scroll wrap having a shape similar to the fixed scroll wrap is engaged with each other to form a pair of spiral symmetric compression spaces between the scrolls, and a discharge chamber at the center of the fixed scroll wrap. And a suction chamber provided outside the fixed scroll wrap, and the orbiting scroll performs a orbiting motion with respect to the fixed scroll via a rotation prevention member. A plurality of compression chambers that continuously move toward the discharge side, the volume of which is changed to compress the fluid, and the compression space; The fluid in the middle of compression escapes to the suction chamber by a bypass communicating with the suction chamber, and has an intermediate hole and a suction hole at the end of the bypass, and the intermediate hole is formed on the end plate of the fixed scroll or on the orbiting scroll. The intermediate hole on the end plate of the fixed scroll is located on at least one of the support discs and faces only one of the pair of compression spaces. The intermediate hole on the support disk of the orbiting scroll is at a position and size that can be completely blocked by a fixed scroll wrap thickness, and is in a low speed operation range. Then, by connecting the bypass and letting fluid in the middle of compression escape to the suction chamber, the apparent suction confinement volume is reduced, and the equivalent capacity Since raising the operation frequency in order to obtain, by a reduction in the leakage loss and the motor loss of the fluid, it is possible to obtain high performance. Further, in the high-speed operation range, it is possible to obtain high performance by disabling the bypass, keeping the suction confining volume constant without escaping fluid during compression, and increasing the original suction confining volume. Therefore, it is possible to operate efficiently over a wide range from small capacity to large capacity.

In the second invention, the involute wrap forming a part of the orbiting scroll is formed on the support disk, while the spiral scroll involute fixed scroll wrap formed upright on one surface of the end plate forming a part of the fixed scroll. The orbiting scroll wrap having a shape similar to the fixed scroll wrap is engaged with each other to form a pair of spiral symmetric compression spaces between the scrolls, and a discharge chamber at the center of the fixed scroll wrap. And a suction chamber provided outside the fixed scroll wrap, and the orbiting scroll performs a orbiting motion with respect to the fixed scroll via a rotation prevention member. A plurality of compression chambers that continuously move toward the discharge side, the volume of which is changed to compress the fluid, and the compression space; The fluid that is being compressed by the bypass communicating with the suction chamber is released to the suction chamber, and has a first intermediate hole, a second intermediate hole, and a suction hole at the end of the bypass, and the first intermediate hole is formed by the fixed scroll. On the end plate or on the support disc of the orbiting scroll and facing only one of the pair of compression spaces, the first intermediate hole on the end plate of the fixed scroll is The position and size of the orbiting scroll wrap can be completely filled with the fixed scroll wrap thickness, and the first intermediate hole on the support disk of the orbiting scroll can be completely covered with the fixed scroll wrap thickness. The second intermediate hole is at least either on the end plate of the fixed scroll or on the support disc of the orbiting scroll. And the second intermediate hole on the end plate of the fixed scroll has a position and a size that can be completely closed by the orbiting scroll wrap thickness. And the second intermediate hole on the support disk of the orbiting scroll has a position and a size that can be completely closed by a fixed scroll wrap thickness, and allows the bypass to communicate in a low speed operation range, By letting the fluid in the middle of compression from both the first intermediate hole and the second intermediate hole of the pair of compression spaces escape to the suction chamber, the pressure loss when the fluid passes through the bypass intermediate hole is suppressed. The suction confinement volume of the engine can be reduced, and the operating frequency is increased to obtain the same capacity, so that higher performance can be obtained by reducing fluid leakage loss and motor loss. You can. Further, in the high-speed operation region, high performance can be obtained by disabling the bypass, keeping the suction confining volume constant without escaping fluid during compression, and further increasing the original suction confining volume. Thus, it is possible to operate efficiently over a wide range from small capacity to large capacity.

  According to a third aspect of the present invention, the involute wrap forming a part of the orbiting scroll is formed on the support disk, while the spiral scroll involute fixed scroll wrap formed upright on one surface of the end plate forming a part of the fixed scroll. A swivel scroll wrap having a shape similar to that of the fixed scroll wrap is engaged with each other to form a pair of spiral symmetric compression spaces between the scrolls, and one of the suction confinement volumes of the compression space Is made smaller than the other, a discharge port leading to a discharge chamber is provided at the center of the fixed scroll wrap, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll is fixed to the fixed scroll via a rotation prevention member. The plurality of pressures in which the compression spaces continuously shift from the suction side to the discharge side by performing a swiveling motion on the The volume is changed so as to compress the fluid divided into the chambers, and the fluid in the middle of compression is released to the suction chamber by a bypass communicating the compression space and the suction chamber, and the first intermediate hole and the suction hole are formed at the end of the bypass. The first intermediate hole is located on at least one of the end plate of the fixed scroll and the support disk of the orbiting scroll, and faces only the compression space having a large suction confinement volume. The first intermediate hole on the end plate of the fixed scroll has a position and a size that can be completely covered with a predetermined interval by the thickness of the orbiting scroll wrap, and the first intermediate hole on the support disc of the orbiting scroll. The intermediate hole has a position and a size that can be completely closed by a fixed scroll wrap thickness, and in the low-speed operation region, the bypass communicates with the compressed air. By allowing the fluid in the middle of compression to escape from the first intermediate hole having the larger suction confinement volume to the suction chamber, the apparent suction confinement volume can be reduced, and the suction and confinement volume of the compression space is larger and smaller. The difference in volume ratio between the two is reduced, and both compression spaces change in volume in a well-balanced manner, so that the torque fluctuation of the shaft is reduced, so that low noise and high efficiency can be realized. In addition, since the operating frequency is increased in order to obtain the same capability, higher performance can be obtained by reducing fluid leakage loss and motor loss. Further, in the high-speed operation range, high performance can be obtained by disabling the bypass, making the suction confining volume constant without returning the fluid being compressed, and increasing the original suction confining volume. Thus, it is possible to operate efficiently over a wide range from small capacity to large capacity.

According to a fourth aspect of the present invention, the involute wrap forming a part of the orbiting scroll is arranged on the support disk, while the spiral scroll involute fixed scroll wrap formed upright on one surface of the end plate forming a part of the fixed scroll. A swivel scroll wrap having a shape similar to that of the fixed scroll wrap is engaged with each other to form a pair of spiral symmetric compression spaces between the scrolls, and one of the suction confinement volumes of the compression space Is made smaller than the other, a discharge port leading to a discharge chamber is provided at the center of the fixed scroll wrap, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll is fixed to the fixed scroll via a rotation prevention member. The plurality of pressures in which the compression spaces continuously shift from the suction side to the discharge side by performing a swiveling motion on the The volume is changed so as to compress the fluid divided into chambers, and the fluid in the middle of compression is released to the suction chamber by a bypass communicating the compression space and the suction chamber, and a second intermediate hole and a suction hole are formed at the end of the bypass. The second intermediate hole is located on at least one of the end plate of the fixed scroll and the support disk of the orbiting scroll, and faces only the compression space having a small suction confinement volume. The second intermediate hole on the end plate of the fixed scroll has a position and a size that can be completely covered with a predetermined interval by the thickness of the orbiting scroll wrap, and the second intermediate hole on the support disc of the orbiting scroll. The intermediate hole has a position and a size that can be completely closed by a fixed scroll wrap thickness, and in the low-speed operation region, the bypass communicates with the compressed air. By allowing the fluid in the middle of compression to escape from the second intermediate hole having the smaller suction confinement volume to the suction chamber, the apparent suction confinement volume can be reduced, and the one having the smaller suction and confinement volume in the compression space is further reduced. Since the operating frequency is increased in order to obtain a smaller capacity and the same capability, higher performance can be obtained by reducing fluid leakage loss and motor loss. Further, in the high-speed operation range, it is possible to obtain high performance by disabling the bypass, keeping the suction confining volume constant without escaping fluid during compression, and increasing the original suction confining volume. Therefore, it is possible to operate efficiently over a wide range from small capacity to large capacity.

  According to a fifth aspect of the present invention, the involute wrap forming a part of the orbiting scroll is arranged on the support disk, while the spiral scroll involute fixed scroll wrap is formed upright on one surface of the end plate forming a part of the fixed scroll. A swivel scroll wrap having a shape similar to that of the fixed scroll wrap is engaged with each other to form a pair of spiral symmetric compression spaces between the scrolls, and one of the suction confinement volumes of the compression space Is made smaller than the other, a discharge port leading to a discharge chamber is provided at the center of the fixed scroll wrap, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll is fixed to the fixed scroll via a rotation prevention member. The plurality of pressures in which the compression spaces continuously shift from the suction side to the discharge side by performing a swiveling motion on the The volume of the fluid is changed so as to compress the fluid divided into chambers, and the fluid in the middle of compression is released to the suction chamber by a bypass communicating the compression space and the suction chamber. An intermediate hole and a suction hole, and the first intermediate hole is located on at least one of the end plate of the fixed scroll and the support disk of the orbiting scroll, and the compression having a large suction confinement volume The first intermediate hole on the end plate of the fixed scroll that faces only the space is at a position and size that can be completely closed by the orbiting scroll wrap thickness, and the support disc of the orbiting scroll. The upper first intermediate hole has a position and size that can be completely covered with a fixed scroll wrap thickness, and the second intermediate hole has the fixed scroll. The second intermediate hole on the end plate of the fixed scroll facing only the compression space on the end plate or on the support disk of the orbiting scroll and having a small suction confinement volume. Is a position and size that can be completely covered by the orbiting scroll wrap thickness, and the second intermediate hole on the support disk of the orbiting scroll is completely covered by the fixed scroll wrap thickness. In the low-speed operation region, the bypass is communicated, and the first intermediate hole having the larger suction confinement volume of the compression space and the first one having the smaller suction confinement volume of the compression space are connected. 2 By letting fluid in the middle of compression from the intermediate hole escape to the suction chamber, the apparent suction confinement volume can be reduced, and suction and trapping of the compression space can be reduced. Both the smaller volume and the larger volume can be reduced, increasing the degree of freedom in setting the volume ratio. In addition, since the operating frequency is increased in order to obtain the same capability, higher performance can be obtained by reducing fluid leakage loss and motor loss. Further, in the high-speed operation range, it is possible to obtain high performance by disabling the bypass, keeping the suction confining volume constant without escaping fluid during compression, and increasing the original suction confining volume. Therefore, it is possible to operate efficiently over a wide range from small capacity to large capacity.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a scroll compressor according to Embodiment 1 of the present invention.

  In FIG. 1, the entire inside of the iron sealed container 1 is a high-pressure atmosphere communicating with the discharge pipe 2, a motor 3 at the center, a compression part at the top, and a crankshaft fixed to the rotor 3 a of the motor 3. A main body frame 5 of a compression portion that supports one end of 4 is fixed to the sealed container 1, and a fixed scroll 6 is attached to the main body frame 5.

  The oil hole 7 in the main shaft direction provided in the crankshaft 4 has one end communicating with the oil supply pump device 8 and the other end finally communicating with the orbiting bearing 10 of the orbiting scroll 9. The orbiting scroll 9 that meshes with the fixed scroll 6 to form the compression chamber 11 includes a spiral orbiting scroll wrap 9a and a wrap support disk 9b in which the orbiting bearing 10 is erected, and the fixed scroll 6 and the main body frame 5 It is arranged between.

  The fixed scroll 6 includes an end plate 6a and a spiral fixed scroll wrap 6b. A discharge port 12 is disposed at the center of the fixed scroll wrap 6b, and a suction chamber 13 is disposed at the outer periphery.

  The orbiting shaft portion 4b that is eccentric from the main shaft portion 4a of the crankshaft 4 and is disposed at the upper end portion of the crankshaft 4 engages and slides with the orbiting bearing 10 of the orbiting scroll 9 and is disposed at the lower end portion of the crankshaft 4. The auxiliary shaft portion 4c is pivotally supported by an auxiliary bearing 19 fixed by welding or shrink fitting in the sealed container 1, and is supported at three points of the main shaft portion 4a, the turning shaft portion 4b, and the auxiliary shaft portion 4c. ing. Between the lap support disk 9b of the orbiting scroll 9 and the first thrust bearing 15a provided in the main body frame 5, a minute gap capable of forming an oil film is provided. An annular seal member 16 that is substantially concentric with the slewing bearing 10 is mounted on the lap support disk 9b in a loose state, and the annular seal member 16 partitions the back chamber 17 inside and the back pressure chamber 18 outside. ing.

  The lubricating oil sucked up by the oil supply pump device 8 passes through the oil hole 7 of the crankshaft 4 and is guided to the axial inner space 20 formed between the orbiting bearing 10 and the orbiting shaft portion 14 of the orbiting scroll 9. Is connected to the back pressure chamber 18 formed by being surrounded by the fixed scroll 6 and the main body frame 5 through the throttle portion 21 provided on the back surface of the lap support disk 9b of the orbiting scroll 9, The oil is guided to the suction chamber 13 through the back pressure adjusting valve 22 and the oil supply passage 22a having a function of pressing against the second thrust bearing 15b on the outer peripheral portion of the fixed scroll wrap 6b. The other passes through the slewing bearing 10, the back chamber 17, and the main bearing 14 and is discharged to the outside of the compression unit.

  A check valve device 23 that opens and closes the outlet side of the discharge port 12 is mounted on the plane of the end plate 6a of the fixed scroll 6, and the check valve device 23 includes a reed valve 23a made of a thin steel plate and a valve presser 23b. Become.

  An intermediate hole 24a and a suction hole 24b are provided at both ends of the bypass 25 on the end plate 6a of the fixed scroll 6. By applying high pressure between the bypass 25 and the intermediate hole 24a and between the bypass 25 and the suction hole 24b, the bypass 25 is provided. The intermediate side reversely supported valve device 27a and the suction side reversely supported valve device 27b communicated by applying a low pressure without being communicated, and the solenoid valve 26 switches the pressure to the bypass 25 between high pressure and low pressure.

  FIG. 2 is an enlarged cross-sectional view of the periphery of the compression mechanism portion such as the fixed scroll 6, the orbiting scroll 9, the bypass 25, and the electromagnetic valve 26 in FIG. 1.

  About the scroll compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

First, with the diversification of operation modes, a wide range of operation has been required, from large capacity operation with large capacity to small capacity operation with small capacity. Mechanical loss increases in the high-speed operation region, and in the low-speed operation region, there is a tendency for deterioration in volume efficiency due to increase in fluid leakage loss and efficiency deterioration due to increase in motor loss. When the suction volume is increased, the operating frequency is lowered to obtain the same capacity, so the performance in the high-speed operating area is improved due to the reduction in mechanical loss. On the other hand, the performance in the low-speed operating range deteriorates due to an increase in fluid leakage loss and motor loss. In addition, when the suction volume is reduced, the operating frequency is increased to obtain the same capacity, so the performance in the low-speed operating area is improved by reducing fluid leakage loss and motor loss, but conversely the performance in the high-speed operating area. Is exacerbated by increased mechanical losses. Therefore, it is possible to operate efficiently over a wide range from a small capacity to a large capacity by increasing the suction volume in the high speed operation range and further decreasing the suction volume in the low speed operation range.

  Therefore, as shown in FIG. 3, the intermediate hole 24 a faces only one of the pair of compression spaces 11 on the end plate 6 a of the fixed scroll 6, thereby allowing the bypass 25 to communicate in the low speed operation region, and in the middle of compression. The fluid is returned to the suction chamber 13, the apparent suction confinement volume is reduced, and the operating frequency is increased in order to obtain the same capacity, so that higher performance is obtained by reducing fluid leakage loss and motor loss. Can do. Further, in the high-speed operation region, the bypass 25 is not communicated, and the suction confining volume is made constant without releasing the fluid in the middle of compression to the suction chamber 13, and the original suction confining volume is increased, thereby achieving high performance. It is possible to obtain a high-capacity vehicle, and it is possible to operate efficiently over a wide range from a small capacity to a large capacity.

  Further, as shown in FIG. 4, the first intermediate hole 28 a faces only one of the pair of compression spaces 11 on the end plate 6 a of the fixed scroll 6, and similarly, the second intermediate hole 28 b is formed in the pair of compression spaces 11. By facing only the other side, the fluid in the middle of compression can escape to the suction chamber 13 from both the first intermediate hole 28a and the second intermediate hole 28b of the pair of compression spaces. Since the pressure loss when passing through 28a and the second intermediate hole 28b can be suppressed and the apparent suction confinement volume can be reduced, it is possible to operate efficiently over a wide range from a small capacity to a large capacity.

  As shown in FIG. 5, when one of the suction confinement volumes of the compression space 11 is made smaller than the other, the first intermediate hole 28 a is on the end plate 6 a of the fixed scroll 6 and the suction volume of the pair of compression spaces 11. By facing only the larger one, the volume ratio between the smaller and larger suction volume of the compression space 11 can be reduced, and the volume of both the compression spaces 11 changes in a balanced manner. Therefore, it is possible to achieve low noise and high efficiency and to operate efficiently over a wide range from small capacity to large capacity.

  As shown in FIG. 6, when one of the suction confinement volumes of the compression space 11 is made smaller than the other, the second intermediate hole 28 b is on the end plate 6 a of the fixed scroll 6 and the suction volume of the pair of compression spaces 11. By facing only the smaller one, it is possible to increase the volume ratio and to operate efficiently over a wide range from small capacity to large capacity.

  Further, as shown in FIG. 7, when one of the suction confining volumes of the compression space 11 is made smaller than the other, the first intermediate hole 28 a is on the end plate 6 a of the fixed scroll 6 and the suction volume of the pair of compression spaces 11. The second intermediate hole 28b faces only the smaller suction volume of the pair of compression spaces 11 on the end plate 6a of the fixed scroll 6 so that the first intermediate holes 28b of the pair of compression spaces are exposed. The fluid in the middle of compression can be released to the suction chamber 13 from both the 28a and the second intermediate hole 28b, and the pressure loss when the fluid passes through the first intermediate hole and the second intermediate hole of the bypass 25 is suppressed, and further apparent Since the upper suction confinement volume can be reduced and the volume ratio can be increased, and the degree of freedom in setting the volume is increased, it is possible to operate efficiently over a wide range from a small capacity to a large capacity.

  As described above, it is possible to reduce the apparent suction confinement volume by releasing the fluid in the middle of compression from the intermediate hole 24a of the bypass 25 to the suction chamber 13, particularly in the low speed operation region, and from a small capacity to a large capacity. It is possible to drive efficiently across.

As described above, the scroll compressor according to the present invention can reduce the apparent suction confinement volume by returning the fluid in the middle of compression from the bypass intermediate hole to the suction chamber. In addition to air conditioner compressors using HFC refrigerants and HCFC refrigerants, it can also be used for applications such as air conditioners using natural refrigerant CO ₂ and heat pump water heaters. Applicable.

The longitudinal cross-sectional view of the vertical scroll compressor in Embodiment 1 of this invention The vertical scroll compression mechanism part expanded sectional view in Embodiment 1 of this invention Orbiting scroll and fixed scroll block diagram which has an intermediate hole only in one of a pair of compression space in Embodiment 1 of this invention FIG. 1 is a configuration diagram of a turning scroll and a fixed scroll having an intermediate hole in one and the other of a pair of compression spaces in Embodiment 1 of the present invention. FIG. 3 is a configuration diagram of a turning scroll and a fixed scroll having a first intermediate hole on the larger suction confinement volume in the first embodiment of the present invention. FIG. 3 is a configuration diagram of a turning scroll and a fixed scroll having a second intermediate hole on the side with a smaller suction confinement volume according to the first embodiment of the present invention. FIG. 2 is a configuration diagram of a turning scroll and a fixed scroll having a first intermediate hole and a second intermediate hole in each of the larger and smaller suction confinement volumes in the first embodiment of the present invention. Operational state diagram of turning at 90 degree intervals of a conventional vertical scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Discharge pipe 3 Motor 3a Rotor 3b Stator 4 Crankshaft 4a Main shaft part 4b Turning shaft part 4c Subshaft part 5 Body frame 6 Fixed scroll 6a End plate 6b Fixed scroll wrap 7 Oil hole 8 Oil supply pump device 9 Turning scroll 9a Orbiting scroll lap 9b Support disk 10 Orbiting bearing 11 Compression space 12 Discharge port 13 Suction chamber 14 Main bearing 15a First thrust bearing 15b Second thrust bearing 16 Annular seal member 17 Back chamber 18 Back pressure chamber 19 Sub bearing 20 Internal space 21 Throttle part 22 Back pressure adjusting valve 22a Oil supply passage 23 Check valve device 23a Reed valve 23b Valve press 24a Intermediate hole 24b Suction hole 25 Bypass 26 Solenoid valve 27a Intermediate side reverse valve device 27b Suction side reverse valve device 28a First 1 intermediate hole 28b 2nd intermediate hole 120 Fixed scroll 121 blade 121a basic blade 121b extension blade 121b1 displacement surface 122 end plate 130 orbiting scroll 130a orbiting shaft 131 blade 131a basic blade 131b extension blade 131b1 displacement surface 132 end plate 140 suction port 141, 141a, 141b, 141b1 compression chamber 141c closed chamber 141c1 142 Anti-rotation turning drive mechanism 143 Oldham ring 145 Discharge port 151 Step

Claims (5)

The involute wrap, which forms part of the orbiting scroll, stands upright on the support disk while the fixed scroll wrap of the spiral involute formed upright on one side of the end plate, which forms part of the fixed scroll, is fixed on the support disk. A swirl scroll wrap having a shape similar to the scroll wrap is meshed with each other to form a pair of spiral symmetrical compression spaces between the scrolls, and a discharge port leading to the discharge chamber is provided at the center of the fixed scroll wrap. In addition, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll performs a orbiting motion with respect to the fixed scroll via a rotation prevention member, whereby each compression space is continuously directed from the suction side toward the discharge side. The volume is changed to compress the fluid by dividing into a plurality of compression chambers to be transferred, and the compression space and the suction chamber are connected. The fluid that is being compressed by the bypass is allowed to escape to the suction chamber, and has an intermediate hole and a suction hole at the end of the bypass. The intermediate hole is on the end plate of the fixed scroll or on the support disk of the orbiting scroll. The intermediate hole on the end plate of the fixed scroll can be completely covered with a certain interval by the thickness of the orbiting scroll wrap, facing only one of the pair of compression spaces. The intermediate hole on the support disk of the orbiting scroll has a position and size that can be completely closed by a fixed scroll wrap thickness, and communicates the bypass in a low speed operation range. By letting the fluid in the middle of compression escape to the suction chamber, thereby reducing the apparent suction confinement volume. Bypass is communicated Hiren a scroll compressor, wherein said that the constant volume confinement inhalation without escape compression during the fluid. The involute wrap, which forms part of the orbiting scroll, stands upright on the support disk while the fixed scroll wrap of the spiral involute formed upright on one side of the end plate, which forms part of the fixed scroll, is fixed on the support disk. A revolving scroll wrap having a shape similar to a scroll wrap is engaged with each other to form a pair of spiral symmetrical compression spaces between the scrolls, and a discharge port leading to a discharge chamber is provided in the center of the fixed scroll wrap. In addition, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll performs a orbiting motion with respect to the fixed scroll via a rotation prevention member, whereby each compression space is continuously directed from the suction side toward the discharge side. The volume is changed to compress the fluid by dividing into a plurality of compression chambers to be transferred, and the compression space and the suction chamber are connected. A fluid that is being compressed by the bypass is released to the suction chamber, and has a first intermediate hole, a second intermediate hole, and a suction hole at an end of the bypass, and the first intermediate hole is formed on the end plate of the fixed scroll or The first intermediate hole on the end plate of the fixed scroll is located on at least one of the support discs of the orbiting scroll and faces only one of the pair of compression spaces, and the thickness of the orbiting scroll wrap is the thickness of the orbiting scroll. A position and size that can be completely covered by a fixed section, and the first intermediate hole on the support disc of the orbiting scroll can be completely closed by a fixed scroll wrap thickness. And the second intermediate hole is on at least one of the end plate of the fixed scroll and the support disc of the orbiting scroll, and The second intermediate hole on the end plate of the fixed scroll faces only the other of the pair of compression spaces, and has a position and a size that can be completely closed by the orbiting scroll wrap thickness. The second intermediate hole on the support disc of the scroll has a position and a size that can be completely covered with a fixed scroll wrap thickness, and in a low speed operation region, the bypass is communicated to allow fluid in the middle of compression to flow. By letting it escape to the suction chamber, the apparent suction confinement volume is reduced, and in the high-speed operation range, the bypass is disconnected, and the suction confinement volume is made constant without letting fluid in the middle of compression escape. A featured scroll compressor. The involute wrap, which forms part of the orbiting scroll, stands upright on the support disk while the fixed scroll wrap of the spiral involute formed upright on one side of the end plate, which forms part of the fixed scroll, is fixed on the support disk. The orbiting scroll wrap having a shape similar to the scroll wrap is engaged with each other to form a pair of spiral-shaped symmetrical compression spaces between the two scrolls, and one of the suction confinement volumes of the compression space is made smaller than the other. A discharge port leading to a discharge chamber is provided at the center of the fixed scroll wrap, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll performs an orbiting motion with respect to the fixed scroll via a rotation prevention member. Thus, each compression space is partitioned into a plurality of compression chambers that continuously transition from the suction side toward the discharge side. The volume of the fluid is changed to compress the fluid, and the fluid that is being compressed is released to the suction chamber by a bypass that connects the compression space and the suction chamber, and the first intermediate hole and the suction hole are provided at the end of the bypass. One intermediate hole is provided on at least one of the end plate of the fixed scroll and the support disk of the orbiting scroll, and faces only the compression space having a large suction confinement volume. The first intermediate hole on the end plate has a position and a size that can be completely covered by the orbiting scroll wrap thickness, and the first intermediate hole on the support disc of the orbiting scroll is fixed. The position and size that can completely block a certain section with the scroll wrap thickness. In the low-speed operation range, the bypass is connected, and the fluid in the middle of compression is sucked in. The suction confining volume apparently is reduced by letting it escape, and the bypass is not communicated in a high-speed operation range, and the suction confining volume is made constant without escaping fluid during compression. Scroll compressor. The involute wrap, which forms part of the orbiting scroll, stands upright on the support disk while the fixed scroll wrap of the spiral involute formed upright on one side of the end plate, which forms part of the fixed scroll, is fixed on the support disk. The orbiting scroll wrap having a shape similar to the scroll wrap is engaged with each other to form a pair of spiral-shaped symmetrical compression spaces between the two scrolls, and one of the suction confinement volumes of the compression space is made smaller than the other. A discharge port leading to a discharge chamber is provided at the center of the fixed scroll wrap, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll performs an orbiting motion with respect to the fixed scroll via a rotation prevention member. Thus, each compression space is partitioned into a plurality of compression chambers that continuously transition from the suction side toward the discharge side. The volume of the fluid is changed to compress the fluid, and the fluid in the middle of compression is released to the suction chamber by a bypass communicating the compression space and the suction chamber. The second intermediate hole and the suction hole are provided at the end of the bypass. 2 The intermediate hole is located on at least one of the end plate of the fixed scroll or the support disc of the orbiting scroll and faces only the compression space having a small suction confinement volume, and The second intermediate hole on the end plate is at a position and size that can be completely covered by the orbiting scroll wrap thickness, and the second intermediate hole on the support disc of the orbiting scroll is fixed. The position and size that can completely block a certain section with the scroll wrap thickness. In the low-speed operation range, the bypass is connected, and the fluid in the middle of compression is sucked in. The suction confining volume apparently is reduced by letting it escape, and the bypass is not communicated in a high-speed operation range, and the suction confining volume is made constant without escaping fluid during compression. Scroll compressor. The involute wrap, which forms part of the orbiting scroll, stands upright on the support disk while the fixed scroll wrap of the spiral involute formed upright on one side of the end plate, which forms part of the fixed scroll, is fixed on the support disk. The orbiting scroll wrap having a shape similar to the scroll wrap is engaged with each other to form a pair of spiral-shaped symmetrical compression spaces between the two scrolls, and one of the suction confinement volumes of the compression space is made smaller than the other. A discharge port leading to a discharge chamber is provided at the center of the fixed scroll wrap, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll performs an orbiting motion with respect to the fixed scroll via a rotation prevention member. Thus, each compression space is partitioned into a plurality of compression chambers that continuously transition from the suction side toward the discharge side. The volume of the fluid is changed to compress the fluid, and the fluid in the middle of compression is released to the suction chamber by a bypass that connects the compression space and the suction chamber. The first intermediate hole, the second intermediate hole, and the suction hole are disposed at the end of the bypass. The first intermediate hole is located on at least one of the end plate of the fixed scroll and the support disk of the orbiting scroll, and faces only the compression space having a large suction confinement volume. The first intermediate hole on the end plate of the fixed scroll has a position and a size that can be completely covered with a predetermined interval by the thickness of the orbiting scroll wrap, and the first intermediate hole on the support disc of the orbiting scroll. The intermediate hole has a position and a size that can be completely covered with a fixed scroll wrap thickness, and the second intermediate hole is formed on the end plate of the fixed scroll. Is located on at least one of the support disks of the orbiting scroll and faces only the compression space having a small suction confinement volume, and the second intermediate hole on the end plate of the fixed scroll is the orbiting The position and size of the scroll wrap thickness can be completely filled with a fixed section, and the second intermediate hole on the support disk of the orbiting scroll can be completely closed with a fixed scroll wrap thickness. The bypass is communicated in the low speed operation area, and the fluid that is being compressed is released to the suction chamber to reduce the apparent suction confinement volume, and in the high speed operation area, the bypass is bypassed. A scroll compressor characterized in that the suction confining volume is made constant without causing fluid to escape during fluid compression.

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