JPH08303363A - Scroll type compression equipment - Google Patents

Abstract

PURPOSE: To provide a small-size and high-performance scroll type compression equipment which facilitates manufacture and assembly excellently lubricates a sliding member, and excellently cooling a built-in motor. CONSTITUTION: A scroll type compression mechanism 103 is stored in a closed container 101 in such a relation that a fixing element 111 and a movable element 112 are positioned in the upper and lower sides respectively, the movable element 112 is gas compressed so as to provide turning movement without any autorotation by power of a motor 104, which is provided in the bottom part in the closed container, and the element 111 is fixed to a frame 102 which is fixed to the wall of the closed container 101. The inside of the closed container 101 is thus partitioned into a high pressure space and a low pressure space and an inlet port 200 is provided in the wall of the closed container 101 which constitutes a space between the motor 104 and the compression mechanism 103 in a low pressure space. And an outlet port 201 is provided in the wall of the closed container 101 which constitutes a high pressure space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a scroll type compression device in which a scroll type compression mechanism is housed in a closed container.

[0002]

2. Description of the Related Art Conventionally, a scroll type compression device is known as a relatively low pressure compression device. This compressor is
The compression mechanism is configured by combining a pair of scroll blades in the axial direction, and has advantages such as small size, high efficiency, and low vibration.

By the way, such a scroll type compression device is usually constructed as shown in FIG. That is, the frame 2 is fixed to the closed container 1 at a position slightly above the open container 1 so as to partition the closed container 1 in the vertical direction, and the scroll type compression mechanism 3 is arranged above the frame 2 and below the frame 2. Further, a motor 4 for giving driving power to the scroll type compression mechanism 3 is arranged, and a lubricating oil 5 is contained in the bottom portion of the closed container 1.

The scroll compression mechanism 3 includes a fixed element 11
And the movable element 12 arranged below the fixed element 11.
It consists of and. The fixing element 11 is a disk-shaped end plate 1.
3, an annular wall 14 projecting from the peripheral edge of one surface of the end plate 13, and an annular wall 1 at a portion surrounded by the annular wall 14.
4 and scroll wings 15 protruding substantially at the same height,
The discharge port 16 provided in the central portion of the end plate 13 and the end plate 13
And an intake port 17 provided at the peripheral edge of the.

In the fixing element 11, the peripheral edge of the annular wall 14 is fixed to the upper surface of the frame 2 with the protruding direction of the annular wall 14 and the scroll blade 15 facing downward, and the suction port 17 hermetically seals the upper wall of the closed container 1. Suction pipe 18 penetrating through
It is connected to the.

On the other hand, the movable element 12 has a mirror plate 19 having an outer diameter larger than the inner diameter of the annular wall 14, and a scroll blade 20 provided on one surface of the mirror plate 19 so as to project at a height substantially equal to the height of the scroll blade 15. And a tubular portion 21 protruding from the central portion of the other surface of the end plate 19.

In this movable element 12, the scroll blade 20 and the scroll blade 15 are engaged with each other with the protruding direction of the scroll blade 20 facing upward, and the peripheral portion of the end plate 19 is the annular wall 1.
It is mounted so as to be in sliding contact with the end face of No. 4, and this mounted state is held by the Oldham mechanism 31 provided between the end plate 19 and the frame 2.

The Oldham mechanism 31, as shown in FIG.
Keys 32a and 32b fixed on the lower surface of the end plate 19 and on both sides of the cylinder portion 21 as a boundary so as to be on the same line.
And the keys 33a, 33b fixed on the upper surface of the frame 2 and on the line orthogonal to the arrangement line of the keys 32a, 32b.
And keys 35a, 33b, 32a and 32b, each having a groove 35a to 34d into which a small gap is inserted, and a ring 35 having upper and lower surfaces.

The frame 2 is provided with a bearing hole 41 which is eccentric to the axis of the tubular portion 21 and which penetrates in the vertical direction. The bearing hole 41 is formed to have a large diameter at a portion located on the cylinder portion 21 side. The rotating shaft 42 of the motor 4 described above is rotatably supported in the bearing hole 41. Rotating shaft 4
2, a large-diameter portion 43 is formed in a portion located in the large-diameter portion of the bearing hole 41 described above, and a small shaft 44 that is fitted into the cylindrical portion 21 described above is formed in the large-diameter portion 43. . The lower end of the rotary shaft 42 is formed so as to penetrate into the lubricating oil 5, and the lubricating oil 5 is fitted into the bearing surface or the tubular portion 21 and the small shaft 44 by a centrifugal pump action. A hole 45 for pumping up is formed at the joint. Further, reference numeral 46 in FIG. 1 denotes a delivery pipe for delivering high-pressure gas through an intermediate portion in the vertical direction in the closed container 1, and 47 denotes a groove for guiding the high-pressure gas and lubricating oil downward.

This apparatus is designed to perform gas compression as follows. That is, when the motor 4 is rotated, its rotational force is transmitted to the movable element 12 via the shaft 42. In this case, the tubular portion 21 of the movable element 12 is eccentric with respect to the shaft 42, and the movable element 12 is supported by the Oldham mechanism 31.
Makes a turning motion without rotation. Therefore, the scroll wing 20 of the movable element 12 also performs the orbiting motion. The volume of the so-called compression chamber P formed between the scroll blades 15 and 20 along with this swirling motion is shown in FIG.
As shown in (b) and (c), the gas becomes periodically small, and the compressed gas is discharged from the discharge port 16, and the function as a compression device is exerted.

However, the conventional scroll type compression device constructed as described above has the following problems. That is, taking the case where this device is incorporated in an actual refrigeration cycle as an example, the low-pressure refrigerant passing through the evaporator is directly introduced into the compression chamber P. Therefore, when the liquid return phenomenon occurs, the load of the motor 4 may become excessive and the scroll blades 15 and 20 may be damaged. Therefore, in the conventional device, the evaporator and the suction pipe 18
It was necessary to install a large-volume gas-liquid separator between and. For this reason, a space for installing the gas-liquid separator is required, and as a result, there is a problem that the entire apparatus becomes large.

Further, the inside of the closed container 1 is maintained at a high pressure, and the motor 4 is installed in this high pressure. As is well known, when a gas is compressed to have a high pressure, the high pressure gas has a high temperature. For this reason, the above-mentioned configuration has a problem that special cooling is required for the motor 4, and a motor having a large capacity must be incorporated from the beginning in consideration of a temperature margin.

Further, with the above structure, since it is necessary to penetrate both the wall of the closed container 1 and the end plate 13 with sufficient alignment accuracy to provide the suction pipe 18, the manufacturing and assembling are troublesome. There was also.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to facilitate manufacturing and assembling and contribute to space saving when actually installed. Yes, good cooling of the built-in motor can be performed,
Another object of the present invention is to provide a scroll-type compression device that can perform good lubrication of sliding parts and can achieve small size and high performance.

[0015]

In order to achieve the above object, a scroll type compression device according to the present invention comprises a hermetically sealed container and a partitioning means for vertically partitioning the hermetically sealed container into two working gas pressure spaces. A fixed element and a movable element, each of which is formed in a shape that forms a compression chamber between them by vertically joining each other in the axial direction and has scroll blades that mesh with each other in the compression chamber, The fixed element is provided with a discharge portion for discharging the gas compressed in the compression chamber, the discharge portion communicates with the one working gas pressure space, and the discharge element is provided between the peripheral portion of the movable element and the fixed element. A suction part for sucking gas into the compression chamber is provided, and the scroll type compression mechanism held by the partitioning means so that the suction part communicates with the other working gas pressure space, and the other working gas pressure. A drive mechanism that is provided in the space for rotating the movable element by the power of the motor without causing rotation, and a space between the motor and the scroll compression mechanism in the other working gas pressure space. A gas inlet provided on the wall of the closed container and a gas outlet provided on the wall of the closed container forming the one working gas pressure space.

[0016]

With the above structure, the low-pressure gas sucked through the gas suction port once enters the other working gas space (hereinafter referred to as the low-pressure space) in the closed container, and then the scroll compression mechanism operates. You will enter the compression chamber. Therefore, when the liquid return phenomenon occurs, the low pressure space can be used as a gas-liquid separator. Therefore, unlike the conventional device, it is not necessary to separately provide a gas-liquid separator, which contributes to space saving.

Further, since the gas suction port is provided in the wall of the hermetically sealed container forming the space between the motor and the scroll type compression mechanism in the low pressure space, the gas suction port leads to the suction portion of the scroll type compression mechanism. Since the flow resistance of the gas flow path can be made sufficiently small and the flow of the suction gas can be made smooth, the volumetric efficiency can be improved and the increase of the motor input can be suppressed.

Further, since the gas suction port is provided on the wall of the hermetically sealed container forming the space between the motor and the scroll type compression mechanism in the low pressure space, when a liquid return phenomenon occurs, this return liquid is supplied to the motor. It can be evaporated by touching.
Therefore, it is possible to prevent the return oil from diluting the lubricating oil contained in the bottom of the low-pressure space, so that stable lubricating characteristics can be exhibited.

Further, the motor is arranged in a low pressure space into which low pressure gas flows. Therefore, the motor comes into contact with a low temperature and low pressure gas, and is cooled well by the gas. Therefore, unlike the conventional device, it is not necessary to provide a special cooling device and it is not necessary to incorporate a motor having a particularly large capacity, so that the entire device can be downsized.

Further, with the above construction, since the gas suction port and the gas discharge port are provided on the wall of the closed container, it suffices to connect the suction pipe and the discharge pipe to these ports. Does not require high alignment. Therefore, manufacturing and assembling can be facilitated.

[0021]

Embodiments of the invention will be described below with reference to the drawings. FIG. 4 shows a scroll type compression device according to an embodiment of the present invention. In the figure, 101 is a vertically long closed container, and a frame 102 is fixed at a position near the upper part of the closed container 101 so as to vertically partition the closed container 101. A scroll type compression mechanism 103 is arranged above the frame 102, a motor 104 for giving driving power to the scroll type compression mechanism 103 is arranged below the frame 102, and a lubricating oil 105 is further provided on the bottom of the hermetic container 101. Is housed.

The scroll type compression mechanism 103 is composed of a fixed element 111 and a movable element 112 arranged below the fixed element 111, similarly to the known one.
The fixing element 111 includes a disk-shaped end plate 113 and the end plate 1
An annular wall 114 projecting from the peripheral edge of one surface of 13;
In a portion surrounded by the annular wall 114, a scroll blade 115 protrudingly provided at a height substantially equal to that of the annular wall 114, and an end plate 1
13 and the discharge port 116 provided at the substantially central portion. The inner edge of the annular wall 114 is formed as a curved surface having an appropriate curvature or a notched surface 117 such as a tapered surface as shown in FIGS. 5 (a) and 5 (b).

Fixing element 111 constructed as described above
In the above, the peripheral edge of the annular wall 114 is hermetically fixed to the peripheral edge of the upper surface of the frame 102 by bolts 118 with the protruding direction of the annular wall 114 and the scroll blade 115 facing downward. The cap 1 is attached to the upper surface of the fixing element 111 during fixing.
19 is applied, and this cap 119 is also bolt 118.
Are fixed together by.

The cap 119 is formed in a size capable of forming a gap 120 having a predetermined thickness between the cap 119 and the upper surface of the end plate 113, and a hole 121 is formed in a part of the wall forming the gap 120.
Are formed. In addition, a hole 122 for guiding the lubricating oil described later is formed in a part of the side wall thereof.

On the other hand, the movable element 112 includes an end plate 123 having an outer diameter slightly larger than the inner diameter of the annular wall 114 and the end plate 12.
3 has a scroll vane 124 projecting at a height substantially equal to the height of the scroll vane 115, and a cylindrical portion 125 projecting at the center of the other face of the end plate 123. As shown in FIGS. 6A and 6B, the peripheral edge of the end plate 123 on the side where the scroll blades 124 project is formed as a notched surface 126 such as a tapered surface.

The movable element 112 configured as described above.
The scroll blade 124 and the scroll blade 115 are engaged with each other with the protruding direction of the scroll blade 124 facing upward, and the peripheral portion of the end plate 123 and the end surface of the annular wall 114 and the end surface of the scroll blade 124 and the end plate 113 and the end surface of the scroll blade 115. And the mirror plate 123 are mounted so as to be in sliding contact with each other, and this mounted state is held by the Oldham mechanism 130 provided between the mirror plate 123 and the frame 102.

The Oldham mechanism 130 is provided with key grooves 131a and 131b provided on the peripheral portion of the lower surface of the end plate 123 and at two positions on the same line drawn through the center of the end plate 123.
7, key grooves 132a and 132b provided on the upper surface of the frame 102 as shown in FIG. 7 on a line orthogonal to the arrangement direction of the key grooves 131a and 131b, and as shown in FIG. Keys 133a, 133b fitted in the grooves 131a, 131b, and keys 134a, 13 fitted in the key grooves 132a, 132b on the other surface.
And a ring 135 having 4b. Then, on both sides of the ring 135, actually, for example, a mesh-shaped oil groove 136 for reducing sliding resistance is formed as shown in FIG. In addition, each key groove 132a, 1
On the inner side surfaces of 32b, 131a and 131b, there is formed an enlarged step portion 137 for reducing the sliding area with the key, as represented by the key groove 132b in FIG.

The frame 102 is provided with a bearing hole 141 which is eccentric with respect to the axial center line of the cylindrical portion 125 of the movable element 112 and penetrates in the vertical direction. The bearing hole 141 is located on the cylindrical portion 125 side. The part to be formed has a large diameter.

The frame structure on the large diameter side is specifically constructed as shown in FIG. That is, the outermost wall has an outer diameter substantially equal to the inner diameter of the closed container 101, and the inner diameter is larger than the inner diameter of the annular wall 114.
The annular wall 14 where the bolt is fastened with bolts 118
2 is formed on the inside, and an annular receiving surface 144 that receives the peripheral portion of the lower surface of the end plate 123 via the annular groove 143 is formed by being lowered, and an annular receiving surface 145 that receives the ring 135 is further formed on the inside. An annular receiving surface 146 that is formed to be lowered and further receives the thrust force reducing mechanism 149 to be described later is formed inside this. Each receiving surface is circumferentially divided into a plurality of radially extending grooves 147, and at least one of the grooves 147 communicates with a hole 148 provided in the wall of the frame 102 for directly communicating the inside and the outside. . The keyway 132a,
132b is formed on the receiving surface 145.

Specifically, as shown in FIGS. 10 (a), (b) and (c), the thrust force reducing mechanism 149 includes an annular body 150 fitted and supported on an annular receiving surface 146, and the annular body 150. An annular groove 151 engraved on the upper surface of 150, and annular grooves 152, 153 shallower and narrower than the annular groove 151 formed inside and outside the annular groove 151 on the upper surface.
And seal rings 154 and 155 made of, for example, tetrafluoroethylene, which are mounted in the annular grooves 152 and 153 so as to partially project outward. Then, at the lower end of the outer peripheral surface of the seal ring 154,
As shown in FIG. 7C, a tapered surface 156 is formed, and a similar tapered surface is also formed at the lower end of the inner peripheral surface of the seal ring 155. At four positions in the circumferential direction of the groove 151, bottomed holes 157 are formed at the same depth as the groove 151 so that the groove 151 communicates with the annular grooves 152, 153.

Inside the end plate 123, with the thrust reducing mechanism 149 mounted as shown in FIG. 4, the annular body 151, the seal rings 154 and 155, and the end plate 123.
A hole 158 is formed so that the space surrounded by the lower surface of the compression chamber P and the high pressure chamber of the compression chamber P are always communicated with each other.

A rotating shaft 160 of the motor 104 is rotatably supported in the bearing hole 141 of the frame 102.
The rotating shaft 160 has a large diameter portion 161 formed in a portion located in the large diameter portion of the bearing hole 141.
1, a small shaft 162 that fits into the above-mentioned tubular portion 125 is provided in a protruding manner. The rotating shaft 160 is formed such that its lower end penetrates into the lubricating oil 105, and its lower end is supported by a lower bearing 163 supported on the inner surface of the hermetic container 101 via a supporting material 200. . In addition, the rotary shaft 16
A hole 164 for pumping the lubricating oil 105 into the bearing surface or the fitting portion of the small shaft 162 and the tubular portion 125 by a centrifugal pump action.
Are formed. The shape of the inlet of the hole 164, that is, the portion located at the lower end of the rotary shaft 160 is
A portion 165 extending upward from the center of the lower end surface of 0
A portion 166 extending radially from this portion 165 to the inner surface of the bearing 163, a portion 167 extending downward from this portion 166, and a rotating shaft 16 extending from this portion 167.
It is combined with a portion 168 that extends in the radial direction slightly shorter than the diameter of zero.

The motor 104 is composed of a squirrel-cage induction motor. The rotor 170 is mounted on the rotating shaft 160 in such a manner that the magnetic center of the rotor 170 is slightly shifted downward with respect to the magnetic center of the stator 171. Further, a slant groove 172 is formed on the surface of the rotor 170.

On the other hand, between the balance weight 173 provided on the upper end of the rotor 170 and the frame 102, there is provided a ratchet type inversion prevention mechanism 174. This inversion prevention mechanism 174 is specifically shown in FIG. It is configured as shown in FIG. That is, a bottomed hole 175 is provided on the inner surface side of the balance weight 173 in the direction of the rotation axis center line, and a stopper rod 176 is slidably accommodated in the bottomed hole 175 and the rod 176 and the bottomed hole 17 are slidably accommodated.
A frame 1 in which a spring 177 for imparting a force for causing the rod 176 to project from the bottomed hole 175 is interposed between the inner surface of the bottom wall of the rod 5 and the rod 176, and the tip of the rod 176 slides.
The outer surface of 02 is provided with a claw-shaped notch 178.

In the portion of the side wall of the closed container 101 located between the scroll type compression mechanism 103 and the motor 104,
A suction port 200 is formed so as to directly communicate with a space region 180 between the scroll type compression mechanism 103 and the motor 104, and a suction pipe 181 is connected to the suction port 200. Further, the discharge port 20 is provided on the upper wall of the closed container 101.
1, a discharge pipe 183 is connected to the discharge port 201 so as to communicate with a space 182 formed between the upper wall and the fixed element 111.

Numeral 184 in FIG. 4 indicates pores provided in the annular wall 114 and the frame 102 for returning the lubricating oil pushed out into the space 182 to the lower side of the frame 102, and numeral 185 indicates a balance weight. Reference numeral 186 denotes a connection mechanism for supplying power to the motor 104, and reference numeral 187 denotes a hole for passing lubricating oil.

Next, the operation of the compression device configured as described above will be described. First, when power is supplied to the motor 104, the rotating shaft 160 starts rotating, and this rotating force causes the movable element 11 to rotate.
2. In this case, the tubular portion 12 of the movable element 112
5 is a small shaft 16 provided eccentrically with respect to the rotating shaft 160.
2 and the movable element 112 is supported by the Oldham mechanism 130.
Makes a turning motion without rotation. Therefore, the scroll vanes 124 provided on the movable element 112 also perform the orbiting motion. Along with this orbiting motion, scroll wing 1
15 and a scroll vane 124 formed between the compression chamber P
3, the volume is periodically reduced, whereby the compressed gas is discharged from the discharge port 116. The discharged high-pressure gas has a gap 120 formed by the cap 119 to a hole 12 provided in the cap 119.
It is delivered from the discharge pipe 183 through the space 1 to the space 182.

On the other hand, when the movable element 112 pivots as described above, it is effective that the cutout surfaces 126 and 117 are formed at the peripheral edge of the upper surface of the end plate 123 and the inner end edge of the annular wall 114. However, the peripheral portion of the compression chamber P is always in communication with the annular groove 143 formed in the frame 102. The annular groove 143 communicates with the hole 148 via the grooves 147 radially provided on the frame 102 and the like, and the hole 148 communicates with the suction pipe 181 via the space 180. Therefore, the low-pressure gas is sucked into the low-pressure port in the compression chamber P via the suction pipe 181, the space 180, the hole 148, the groove 147, and the annular groove 143, and the function as the compression device is provided here. To be demonstrated.

In this case, even if a liquid such as a refrigerant is mixed in the low-pressure gas flowing through the suction pipe 181, this liquid drops downward while moving in the space 180 and is lubricated. Attempts to move to the bottom of the tank 101 where the oil 105 is accumulated. Since the motor 104 is self-heated, the dropped liquid is gasified by the heat, mixed with the flow of what has already been gasified, and moves into the compression chamber P. Therefore, the space 180 performs exactly the same action as the gas-liquid separator, and the existence of the space 180, that is, the existence of such a gas flow path prevents the scroll vanes 115 and 124 from being damaged.

In this case, since the suction port 200 is provided in the wall of the closed container 101 so as to directly communicate with the space 180 located between the motor 104 and the scroll type compression mechanism 103, the scroll type compression mechanism is inserted from the suction port 200. The flow resistance of the gas flow path leading to the suction part of 103 can be made sufficiently small,
Since the flow of the suction gas can be made smooth, the volumetric efficiency can be improved. Further, it is possible to suppress an increase in the input of the motor 104.

Further, since the suction port 200 is provided on the wall of the closed container 101 so as to directly communicate with the space 180,
When a liquid return phenomenon occurs, the return liquid can be brought into contact with the motor 104 to evaporate. Therefore, it is possible to prevent the lubricating oil 105 contained in the bottom portion from being diluted by the return liquid, so that stable lubricating characteristics can be exhibited.

Further, since the motor 104 can be brought into contact with the low pressure and low temperature gas, the motor 104 can be cooled well by the gas. Therefore, unlike the conventional device, it is not necessary to provide a special cooling device, and it is not necessary to incorporate a special large-capacity motor.
The size of the entire device can be reduced.

On the other hand, when the motor 104 rotates as described above, a part of the lubricating oil 105 is pumped upward in the hole 164 by the centrifugal pump action due to the shape of the hole 164.

This pumped lubricating oil is used for the bearing hole 14
After lubricating the inner peripheral surface of No. 1, the fitting portion between the small shaft 162 and the tubular portion 125 is lubricated, and subsequently, the portion where the Oldham mechanism 130 is provided is lubricated through the hole 187, and thereafter, a part thereof is lubricated. Flows downward from the hole 148, and the rest enters the compression chamber P to lubricate the sliding portion in the compression chamber P. Then, after the lubricating oil that has entered the compression chamber P is finally discharged from the discharge hole 116, it flows out from the hole 122 provided in the cap 119, and then flows downward through the fine hole 184 due to the pressure difference. Run down. Therefore, the high pressure gas containing no lubricating oil is discharged from the discharge pipe 183. In addition, the reduction of lubricating oil is also prevented.

Further, as described above, when the movable element 112 performs the turning motion and the compression operation is performed, the compression chamber P
Since the inside has a high pressure, the movable element 112 receives a downward force, and this force may be applied to the Oldham mechanism 130, the receiving surface 144 of the frame 102, and the like, and a seizure phenomenon may occur in these elements. However, in the case of this embodiment, the thrust reduction mechanism 149 and the motor 104 prevent the seizure phenomenon as follows.

That is, the annular body 150 of the thrust force reducing mechanism 149, the seal rings 154 and 155, and the end plate 1
The annular space surrounded by 23 always communicates with the so-called high-pressure port of the compression chamber P via the hole 158. Therefore, the end plate 123 receives an upward force due to the gas pressure in the annular space, and the presence of this force causes the end plate 123 to move.
The downward force received by him will be reduced. The magnetic center of the rotor 170 of the motor 104 is slightly shifted from the magnetic center of the stator 171. Moreover, the inclined groove 172 is formed on the surface of the rotor 170.
Therefore, when power is supplied to the motor 104, the stator 171
The upward magnetic force always acts on the rotor 170 so as to match the magnetic center of the rotor 170 with the magnetic center of the rotor 170. Since this magnetic force is different from the downward force acting on the mirror plate 123 by 180 degrees, the downward force received by the mirror plate 123 is also reduced by the above magnetic force, and by this reduction, the occurrence of the seizure phenomenon is prevented. The movable element 11
The downward force applied to 2 pulsates as the position of the compression space changes. Therefore, the high pressure gas may leak from the thrust force reducing mechanism 149 to the low pressure side. In this embodiment, however, the annular groove 151 and the seal rings 154 and 155 are attached to the annular groove 151 as shown in FIG. Groove 152,
Since the bottomed hole 157 that communicates with the 153 is provided,
The seal rings 154 and 155 always have a force as indicated by a solid arrow in FIG.
A force for pressing 155 against the lower surface of the end plate 123 acts.
Therefore, leakage of the high-pressure gas is prevented by this pressing.

Further, when the motor 104 is stopped,
Due to the pressure difference between the space 182 and the space 180, the movable element 1
There is a possibility that the high pressure gas may flow into the low pressure side due to the backward rotation of 12. However, in the case of this embodiment, since the ratchet type inversion prevention mechanism 174 is provided, the occurrence of the reverse rotation is surely prevented, and the outflow of the high pressure gas is prevented.

As described above, the closed container 101 is constituted by the frame 102 and the fixing element 111 of the scroll type compression mechanism 103.
The inside is divided into a low-pressure space 180 and a high-pressure space 182,
The low-pressure gas sucked through the gas suction port is supplied to the space 180.
Is introduced to the compression chamber P of the scroll type compression mechanism 103. Therefore, the space 108 can be used as a gas-liquid separator. Therefore, unlike the conventional device, it is not necessary to separately provide a gas-liquid separator, which contributes to space saving. Further, the motor 104 is arranged in the space 180 into which low-pressure gas flows. Therefore, the motor 104 comes into contact with the low temperature and low pressure gas, and is cooled well by the gas.
Therefore, unlike the conventional device, it is not necessary to provide a special cooling device, and it is not necessary to incorporate a special large-capacity motor. Therefore, the size of the entire device can be further reduced.

Further, with the above structure, the closed container 10
Since the low-pressure space 180 and the high-pressure space 182 are formed in the inside 1, the gas inlet and the gas outlet are provided on the wall of the closed container, and the suction pipe 181 and the discharge pipe 183 are provided at these ports.
Need only be connected, and the connection does not require precise alignment. Therefore, manufacturing and assembling can be facilitated. Further, with the above configuration, the lubricating oil that has moved to the high pressure space 182 can be stored in the space 182 and the space 18
The pressure difference between 0 and the low pressure space 18 through the pores 184.
Since it can be automatically returned to 0, the reduction of the lubricating oil can be prevented, and stable lubricating characteristics can be exhibited over a long period of time, so that the above-mentioned effects are finally obtained.

The present invention is not limited to the above embodiment. For example, a known promotion mechanism that promotes the separation of gas and liquid may be installed in the space 180. Further, the cutout surfaces 126 and 117 provided on the movable element 112 and the fixed element 111 may have a shape that does not increase the flow resistance, and may be provided on only one of them.

[0051]

【The invention's effect】

(1) Since the low-pressure gas sucked through the gas suction port is once put into the low-pressure space in the closed container and then into the compression chamber of the scroll compression mechanism, when a liquid return phenomenon occurs. The low pressure space can be used as a gas-liquid separator. Therefore, unlike the conventional device, it is not necessary to separately provide a gas-liquid separator, which contributes to space saving.

(2) Since the gas suction port is provided in the wall of the closed container forming the space between the motor and the scroll type compression mechanism in the low pressure space, the suction of the scroll type compression mechanism is performed from the gas suction port. Since the flow resistance of the gas flow path to the section can be made sufficiently small and the flow of suction gas can be made smooth,
The volumetric efficiency can be improved and the increase in motor input can be suppressed.

(3) Since the gas suction port is provided in the wall of the closed container forming the space between the motor and the scroll type compression mechanism in the low pressure space, when a liquid return phenomenon occurs, this return The liquid can be evaporated by touching the motor. Therefore, it is possible to prevent the return oil from diluting the lubricating oil contained in the bottom of the low-pressure space, so that stable lubricating characteristics can be exhibited.

(4) The motor is arranged in a low pressure space into which low pressure gas flows. Therefore, the motor comes into contact with a low temperature and low pressure gas, and is cooled well by the gas. Therefore, unlike conventional devices,
Since it is not necessary to provide a special cooling device and it is not necessary to incorporate a motor having a particularly large capacity, the size of the entire device can be reduced.

(5) Since the gas inlet and the gas outlet are provided on the wall of the closed container, it suffices to connect the suction pipe and the discharge pipe to these ports, and the connection requires highly accurate alignment. Not. Therefore, manufacturing and assembling can be facilitated.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a conventional device of this type.

FIG. 2 is an explanatory view of an Oldham mechanism incorporated in the device.

FIG. 3 is a diagram for explaining the compression principle of the device.

FIG. 4 is a vertical cross-sectional view of a scroll type compression device according to an embodiment of the present invention.

FIG. 5 (a) is a bottom view of a fixing element in the device,
(b) is a cross-sectional view of the installation condition taken along the line AA in (a) and viewed in the direction of the arrow.

FIG. 6 (a) is a top view of a movable element in the device,
(b) is a sectional view taken along the line BB in (a).

FIG. 7 is a partially cutaway exploded perspective view showing only an upper portion of a frame in the same device.

FIG. 8 is a plan view of the main part of the Oldham mechanism in the same device.

FIG. 9 is a view for explaining the shape of a keyway of the Oldham mechanism.

FIG. 10 (a) is a top view of a sliding friction reducing mechanism incorporated in the same device, FIG. 10 (b) is a view taken along the line CC of FIG.
(c) is a diagram for explaining the shape of the seal ring incorporated in the mechanism.

FIG. 11 is a sectional view taken along the line DD in FIG.

[Explanation of symbols]

 101 ... Airtight container 102 ... Frame 103 ... Scroll type compression mechanism 104 ... Motor 105 ... Lubricating oil 111 ... Fixed element 112 ... Movable element 115, 124 ... Scroll blade 116 ... Discharge port 130 ... Oldham mechanism 141 ... Bearing hole 143 ... Annular groove 147 ... Groove 148 ... Hole 149 ... Thrust force reducing mechanism 160 ... Rotating shaft 164 ... Centrifugal pump hole 170 ... Rotor 171 ... Stator 174 ... Inversion prevention mechanism 180, 182 ... Space 181 ... Suction pipe 183 ... Discharge pipe 200 ... Suction port 201 ... Discharge port

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location F04C 29/04 F04C 29/04 N (72) Inventor Mitsuo Hatori Komukai Toshiba, Kawasaki City, Kanagawa Prefecture Town No. 1 Toshiba Corporation Research Institute

Claims (1)

[Claims] 1. A closed container, partition means for partitioning the inside of the closed container into two working gas pressure spaces, and a shape for axially joining each other to form a compression chamber therebetween. The fixed element and the movable element, each of which is formed and has scroll blades that mesh with each other in the compression chamber, are provided with a discharge portion for discharging the gas compressed in the compression chamber to the fixed element. Part communicates with the one working gas pressure space, and a suction part for sucking gas into the compression chamber is provided between the peripheral part of the movable element and the fixed element, and the suction part has the other working gas pressure. A scroll-type compression mechanism held by the partitioning means so as to communicate with the space, and a movable element provided in the other working gas pressure space to cause the movable element to perform a revolving motion without rotation. A dynamic mechanism, and a gas suction port and the one working gas pressure space provided on the wall of the hermetic container that forms a space between the motor and the scroll compression mechanism in the other working gas pressure space. A scroll-type compression device, comprising: a gas discharge port provided on a wall of the closed container.