JPS6075790A - Compressing device of scroll type - Google Patents

Abstract

PURPOSE:To substantially decrease the downward thrust force acting on a movable element so as to reduce input power for a device, prevent its seizure and improve its performance, by providing the first and the second annular spaces in bottom face sides of the movable element and guiding high pressure gas in a compression chamber to these annular spaces through a gas guide path. CONSTITUTION:A rotary shaft, in its part positioned in the large contour portion of a bearing hole 141, forms a large contour part 161, and the large contour part 161 provides a small shaft 162 fitted into a cylindrical part 125. Enclosed annular spaces 171, 172 are formed between the large contour part 161 and the cylindrical part 125 and between the large contour part 161 and a frame 102, and a delivery port and a high pressure port neighboring to this delivery port in a compression chamber P are alternately communicated to the annular spaces 171, 172 through a hole 179, generating upward thrust force.

Description

DETAILED DESCRIPTION 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.

[Background technology of the invention and its problems]

Scroll-type compression devices are conventionally known as low-pressure compression devices. This compression device has a compression mechanism constructed 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 usually
It is constructed as shown in FIG.

That is, a frame 2 is fixed at a position slightly above the closed container 1 in a form that partitions the inside of the closed container 1 in the vertical direction, a scroll type compression mechanism J is arranged above the frame 2, and A motor 4 for providing driving power to the scroll type compression mechanism 1 is disposed below, and a lubricating oil 5 is further stored in the bottom of the closed container 1.

The scroll type compression mechanism J includes a fixed element 11 and a movable element 12 arranged below the fixed element 11. The fixing element 11 includes a disk-shaped mirror, a plate 13, an annular wall 14 protruding from the peripheral edge of one side of the mirror plate 13, and a portion surrounded by the annular wall 14. It is composed of a scroll 1115 protruding at approximately the same height, a discharge port 16 provided at the center of the end plate 13, and a suction inlet 17 provided at the periphery of the end plate 13.

In the fixing element 11 configured as described above, 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 blades 15 facing downward, and the suction port 17 is still sealed. It is provided airtightly penetrating the earthen wall of the container l and is in contact with the suction pipe 18. On the other hand, the movable aluminum plate 2 has a head plate 19 having an outer diameter larger than the inner diameter of the annular wall 14, and a scroll protruding from one side of the head plate 19 at a height approximately equal to the height of the scroll blade 5. It is composed of wings 20 and a cylindrical portion 2 protruding from the center of the other end plate 19. And the movable element 1
2 is installed so that the scroll blade 2o and the scroll blade 15 are engaged with each other with the protruding direction of the scroll blade 20 being upward, and the peripheral part of the end plate 19 is in sliding contact with the end surface of the annular wall 14, and this installed state is It is held by an Oldham mechanism 3 provided between the mirror plate 19 and the frame 2 described above.

As shown in FIG. 2, the Oldham mechanism 3 includes keys 72 a and 32 b fixed to the lower surface of the end plate 19 and on both sides of the cylinder portion 2 on the same line;
Keys 33 a and 3 are fixed on the upper surface of the frame 2 and on a line perpendicular to the arrangement line of the keys 32 a and 32 b.
．． 1 b and these keys 33a, 33b, 32a, 32
Grooves 34a to 34 into which the grooves b are fitted with minute gaps, respectively.
d on the upper and lower surfaces.

The frame 2 is provided with a bearing hole 41 that is eccentric from the axis of the cylindrical portion 2 and extends vertically. The bearing hole 41 is formed to have a large diameter at a portion located on the cylindrical portion 2 side. The rotating shaft 42 of the motor 4 described above is rotatably supported within the bearing hole 41. The rotating shaft 42 has a large diameter portion 43 formed in a portion located in the large diameter portion of the bearing hole 41 described above, and a small shaft 44 that fits into the cylinder portion 21 described above is formed in this large diameter portion 43. ing. Note that the lower end of the rotating shaft 42 is coated with lubricating oil 5.
The lubricating oil 5 is formed inside the bearing surface, the cylindrical part 21 and the small shaft 44 by the centrifugal action.
A pumping hole 45 is formed in the fitting portion with the pump. In FIG. 1, reference numeral 46 indicates a delivery pipe for sending out high pressure gas to a vertically intermediate portion within the closed container J, and 47 indicates a groove for guiding the high pressure gas and lubricating oil downward.

This device compresses gas in the following manner. That is, when the motor 4 is rotated,
The rotational force is transmitted to the movable element 12 via the shaft 42. In this case, since the cylindrical portion 2 of the movable element 12 is eccentric with respect to the shaft 42 and is supported by the Oldham mechanism 3, the movable element 12 performs a turning motion without rotation. Therefore, the scroll blades 20 of the movable element 12 also perform a swirling movement.

As a result of this swirling movement, the volume of the so-called compression chamber P formed between the scroll lengths of 15° and 20° increases as shown in Figure 3(a).
, (b) and (e), the compressed gas is discharged from the discharge port, and the function as a compression device is exhibited.

However, the conventional scroll type compression device configured as described above has the following problems. In other words, if this device is installed in an actual refrigeration cycle, the low-pressure refrigerant that has passed through the evaporator will directly flow into the compression chamber P.
It will be introduced within. Therefore, there is a possibility that a liquid return phenomenon may occur. When this liquid return phenomenon occurs, the scroll blades 15 and 20 are damaged. Therefore, in the conventional apparatus, it was necessary to provide a large volume gas-liquid separator between the evaporator and the suction pipe 18. For this reason, a space for installing the gas-liquid separator is required, resulting in the problem of increasing the size of the entire device. Further, the inside of the closed container 1 is maintained at a high pressure, and the motor 4 is installed within this high pressure. As is well known, when gas is compressed to high pressure, this high pressure gas becomes high temperature. Therefore, with the above configuration, special measures are taken to cool the motor 4,
There was also the problem that a large capacity motor had to be installed from the beginning to ensure temperature margins.

Therefore, in order to eliminate such problems, the discharge pipe 46 is used as a suction pipe, and the suction pipe 18 is connected to the space between the earthen wall of the closed container 1 and the fixing element 1 to be used as a discharge pipe.
It is also conceivable to suck low-pressure gas into the compression chamber P from the periphery of the contact portion between the fixed element 11 and the movable element 2.

In this way, the lower space inside the closed container 1 can be used as a gas-liquid separator, and low-pressure, low-temperature gas can be brought into contact with the mold 4, so the above-mentioned problems can be solved. can.

However, when configured as described above, the following new problems may occur. That is, when the movable element 12 performs a rotational motion and a compression operation is performed, the pressure inside the compression chamber P becomes high, so that a downward thrust force acts on the movable element 12.

This thrust force is applied to the sliding parts of the organ mechanism, etc., which increases sliding loss, increases input, and even causes burn-in phenomenon. Furthermore, if the thrust force is large, the tip of the scroll blade 15.degree. 20 separates from each end plate, creating a gap. When such a gap occurs, leakage of compressed gas increases, which inevitably leads to a decrease in performance. Therefore, there is a desire for a device that can significantly reduce the above-mentioned thrust force.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and its purpose is to reduce the downward thrust force applied to the movable element when the lower surface side of the movable element is used in a low pressure atmosphere. It is an object of the present invention to provide a scroll type compression device that can significantly reduce the amount of power input, reduce the power input, prevent seizure, and improve performance.

[Summary of the invention]

The present invention includes a scroll-type compression mechanism consisting of a fixed element and a movable element placed above the airtight container with the movable element facing downward, and a driving motor placed below the airtight container. Further, the movable element is operated under a condition in which a lower surface side thereof is in a low-pressure atmosphere, and the movable element has a cylindrical portion projecting from the lower surface of the movable element, and a cylindrical portion connected to the rotating shaft of the motor. a small shaft fitted into the shaft and provided eccentrically with respect to the rotating shaft, a large diameter portion provided at the boundary between the small shaft and the rotating shaft, and a bearing hole for supporting the rotating shaft in the center portion. and a frame fixed to the airtight container, a relationship closed by each of the above elements between the upper surface of the large diameter part and the lower end of the cylindrical part, and between the lower surface of the large diameter part and the frame, respectively. The first provided. It is characterized by comprising a second annular space and a gas guide path that guides the high pressure gas in the compression chamber into the first and second annular spaces through the movable element and the small shaft. .

〔Effect of the invention〕

With the above configuration, the pressure of the gas guided into the first annular space formed between the upper surface of the large diameter part and the cylindrical part,
The large diameter portion receives a downward force, and the cylindrical portion receives an upward force. On the other hand, due to the pressure of the gas introduced into the second annular space formed between the lower surface of the large diameter portion and the frame, the large diameter portion receives an upward force, and the trench frame receives a downward force. However, since the frame is fixed to the closed container, only the cylindrical portion receives upward force without any force acting on the large diameter portion. Since the cylindrical part is connected to the movable element,
The force will reduce the downward thrust force experienced by the movable element. Therefore, it is possible to prevent a large force from being applied to the sliding portion of the Oldham mechanism, etc., thereby preventing increased sliding loss and seizure. Further, since the downward thrust force applied to the movable element can be reduced, there is no possibility that a gap will be formed between the end face of the scroll blade and the mirror plate. thus improving performance′
You can also do it. Further, the downward thrust force applied to the movable element can be reduced with no force being applied to the large diameter portion. Therefore, there is no risk that the load on the motor will increase.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 4, reference numeral 101 denotes a vertically formed hermetic container, and seven frames 102 are fixed at an upper position in this hermetic container 101 to vertically partition the inside of the hermetic container 1θ1. has been done. And frame 102
A scroll type compression mechanism 103 is disposed above the frame 102, and the scroll type compression mechanism 10 is disposed below the frame 102.
A motor 104 for providing driving power to 3 is arranged,
Further, lubricating oil 105 is stored at the bottom of the closed container 101.

The scroll type compression mechanism 103 is similar to the known one,
It is composed of a fixed element 111 and a movable element 112 arranged below the fixed element 111. The fixing element 111 includes a disk-shaped mirror plate 11.7, an annular wall 114 protruding from the peripheral edge of one side of the mirror plate 113, and a portion surrounded by the annular wall 114 that is substantially similar to the annular wall 114. A scroll R115 protruding at the same height and a mirror plate 113
The discharge hole 116 is provided approximately at the center of the discharge hole 116. The inner edge of the annular wall 114 is formed into a notched surface 117, such as a curved surface with an appropriate curvature or a tapered surface as shown in FIGS. 5(a) and 5(b). Therefore, the fixing element 111 configured as described above is
The peripheral edge of the annular wall 114 is hermetically fixed to the peripheral edge of the upper surface of the frame 102 with bolts 118, with the protruding direction of the annular wall 114 and the scroll fizls facing downward. Incidentally, when fixing, a cap 119 is peeled off on the top surface of the fixing element 111, and this cap 119 is also fixed integrally with the bolts 1 and 8. character f119
is formed in a size that can form a gap 120 of a predetermined thickness between it and the upper surface of the mirror plate 113, and a hole 12 is formed in a part of the wall forming this gap 120. In addition, a part of the side wall has a reservoir hole 1 for guiding lubricating oil, which will be described later.
22 is formed. On the other hand, the movable element 112 has a mirror plate 123 having an outer diameter slightly larger than the inner diameter of the annular wall 114.
The scroll blades 11 are mounted on one surface of this mirror plate 123.
Scroll blade 1 protruding at a height approximately equal to the height of 5.
24, and a cylindrical portion 125 protruding from the other central portion of the end plate 123. The peripheral edge of the mirror plate 123 on the side on which the scroll blades 124 protrude is formed into a cutout surface 126 such as a chi-shape, as shown in FIGS. 6(a) and 6(b). There is. In the movable element 112 configured as described above, the scroll blades 124 and the scroll blades 115 are engaged with each other with the protruding direction of the scroll blades 124 facing upward, and the peripheral portion of the @R plate 123 and the annular wall 114 are engaged with each other. End face and scroll wing 124
The end face of the mirror plate 11.9 and the end face 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 maintained by an Oldham mechanism 130 provided between the mirror plate 123 and the frame lθ2. ing.

The Oldham mechanism 130 has keyways 131a and 131b provided at two locations on the same line drawn through the center of the endplate 123 at the peripheral edge of the lower surface of the endplate 123;
A key groove (not shown) provided on the upper surface of the frame 102 on a line perpendicular to the arrangement direction of the elements 1a and 131b, and the key grooves 1.91a, 13lb on one surface.
The ring 132 has a key that fits into the ring 132, and a ring 132 that has a key that fits into a key groove provided in the frame 1θ2 on the other side. And the above ring 1
32 are actually formed with, for example, mesh-like oil grooves to reduce the sliding resistance.

Therefore, the frame 102 includes the movable element 1.
A bearing hole 14 which is eccentric with respect to the axis aK of the cylindrical portion 125 of No. 2 is provided to penetrate in the vertical direction.
The portion of No. 7 located on the cylindrical portion 125 side is formed to have a large diameter. The frame structure on the larger diameter side is specifically constructed as follows. That is, as shown in FIG. 7, the outermost part has an outer diameter approximately equal to the inner diameter of the container lθ, and the inner diameter is larger than the inner diameter of the annular wall 114. The clamp is formed with an annular wall 142 to which it is fixed, among which fli! 1 through the annular groove 143 to the mirror plate 123.
The annular receiver that receives the peripheral portion of the lower surface is formed with a surface 144 lowered one step further, and the annular receiver that receives the ring 135 inside this annular receiver is formed with the surface 145 further lowered one step. The surface of the can holder is divided into a plurality of parts in the circumferential direction by grooves 146 provided radially, and at least one of the grooves 146 is connected to a hole 147 provided in the wall of the frame 102 that allows direct communication between the inside and outside. I understand.

A rotating shaft 16θ of the motor 104 is rotatably supported in the bearing hole 14 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, and a small shaft 162 that fits into the aforementioned cylindrical portion 125 is provided protruding from this large diameter portion 161. ing. The rotating shaft 160 is formed in such a length that its lower end penetrates into the lubricating oil 105,
Its lower end is supported by a lower bearing 163 supported on the inner surface of the closed container 101 via the support side 200. In addition, lubricating oil 1 is provided inside the rotating shaft 160 by the action of a centrifugal pump.
A hole 164 is formed through which the small shaft 162 and the cylindrical portion 125 fit together. This hole 164
The shape of the inlet part, that is, the part located at the lower end of the rotating shaft 16θ, consists of a part 165 extending upward from the center of the lower end surface of the rotating shaft 160, and a part 165 extending radially from this part -165 to the inner surface of the bearing 163. It is a combination of an extending portion 166, a portion 167 extending downward from this portion 166, and a portion 168 extending radially from this portion 167 by a length slightly shorter than the diameter of the rotating shaft 160. There is.

Therefore, a closed annular space 171 is formed between the upper surface of the large diameter section 161 and the lower end of the cylindrical section 125 and between the lower surface of the large diameter section 161 and the frame 102, as shown in an enlarged view in FIG. .172 is formed. The annular space 171
, a portion 173 in which the lower end of the cylindrical portion 125 is extended outward in a brim shape along the upper surface of the large diameter portion 161, and this portion 17.
3 and a portion 174 that extends downward from the outer circumferential edge of the large diameter portion 161 and fits into the upper outer circumferential edge of the large diameter portion 161. The annular space 172 is still constituted by an annular stepped portion 175 formed at a portion of the inner surface of the frame 102 that makes sliding contact with the lower surface of the large diameter portion 16 . And the annular space 171.1
72 are common to the inside of the small shaft 162 and the large diameter portion 16.
The hole 176 is connected to the lower end side of the hole 176 formed in the hole 176. The upper end side of the hole 176 is inserted through a fitting portion between a projection 177 protruding from the upper end surface of the small shaft 162 and a recess 178 formed on the lower surface of the end plate 123 so that the projection 177 can fit therein. It communicates with one end side of a hole 179 provided in the mirror plate 123 . The other end of the hole 179 is opened at a position where it can alternately communicate with a discharge port in the compression chamber P and a high pressure port adjacent to the discharge port.

Therefore, in a portion of the side wall of the closed container 101 located between the scroll type compression mechanism 103 and the motor 1o4, the scroll type compression mechanism 1θ3 and the motor 104 are provided.
A suction pipe 181 is connected to the space 180 in communication with the space 180 between the upper wall and the fixing element 111.
A discharge pipe 183 is connected to communicate with 2.

In addition, 184 in FIG. 4 indicates a hole provided in the annular wall 114 and the frame 102 in order to return the lubricating oil pushed out into the space 182 downward from the frame 102.
85 indicates a balance weight, 186 indicates a motor 104
187 shows a hole through which lubricating oil passes.

Next, the operation of the compression device configured as described above will be explained.

First, when power is supplied to the motor 104, the rotating shaft 16θ starts rotating, and this rotational force is transmitted to the movable element 112.

In this case, the cylindrical portion 125 of the movable element 112 is connected to the rotating shaft 160.
Since it is fitted with a small shaft 162 provided eccentrically relative to the rotor and supported by the Oldham machine 4W't 13o, the movable thick element 112 performs a turning motion without rotation. Therefore, the scroll blades 124 provided on the movable element 112 also perform a swirling movement. Along with this swirling movement, the scroll blades 115 and 12
As shown in FIG. The discharged high-pressure gas flows from the gap 120 formed by the character 'fl19 to the hole 121 provided in the cap 119 to the space 1''+Jj 1
It is sent out from the discharge pipe 183 via 82. On the other hand, when the movable elements 1 and 2 rotate as described above, the upper surface periphery of the end plate 123 of this movable element 112 and the fixed element 111
The fact that a notch surface 126° 117 is formed at the inner end edge of the annular wall 114 effectively acts to close the compression chamber P.
An annular groove 14 whose peripheral edge is formed in the frame 102
3 is always in communication.

The annular groove 143 communicates with the hole 147 via a groove 146 provided radially in the frame 102, and also communicates with the hole 147.
7 communicates with the suction pipe 181 through the space 180, so the low pressure gas eventually flows through the suction pipe 181~space 180~hole 147~groove 146 and annular groove 143 and into the low pressure port in the compression chamber P. When it is sucked in, it functions as a compression device. Note that in this case,
Even if a liquid such as a refrigerant is mixed into the low-pressure gas that has flowed in through the suction pipe 181, this liquid will fall downward while moving within the space 180, and the liquid will fall into the tank 1 where the lubricating oil 105 is stored.
Trying to move to the bottom of 01. However, motor 10
4 generates self-heat, the fallen liquid is gasified by the heat, mixes with the flow of the already gasified liquid, and moves into the compression chamber P. Therefore, the space 180
has exactly the same function as a gas-liquid separator, and the existence of this space 180, that is, the existence of such a gas flow path, prevents damage to the scroll blades 1xs, x24 (D).

On the other hand, when the motor 104 rotates as described above, a portion of the lubricating oil 105 is pumped upward into the hole 64 due to the centrifugal pump action due to the shape of the hole 164. This pumped up lubricating oil lubricates the inner peripheral surface of the bearing hole 141, and then lubricates the fitting part between the small shaft 162 and the cylindrical part 125.
Subsequently, the part where the Oldham mechanism 130 is installed is lubricated through the hole 187, and then a part of it flows down through the hole provided in the frame 102, and the remainder enters the compression chamber P. to lubricate the sliding parts inside the compression chamber P. The lubricating oil that has entered the compression chamber P is finally discharged through the discharge hole 116, and then the lubricating oil is discharged through the hole 12 provided in the cap 119.
2 and flows downward through hole 184. Therefore, high-pressure gas containing no lubricating oil is discharged from the discharge pipe 183.

Further, as described above, when the movable element 112 performs a rotational motion and performs a compression operation, the pressure inside the compression chamber P becomes high, so the movable element 112 receives a downward thrust force,
This force is applied to the receiving surface 145 of the frame 102 of the Oldham mechanism 1301, etc., and there is a possibility that a seizure phenomenon may occur in these elements. However, in this embodiment, the occurrence of the burn-in phenomenon is prevented in the following manner. That is, the discharge port and high pressure port in the compression chamber P are connected to the hole 179.1.
Via 76 they communicate alternately with the annular spaces 17.1, 172. Therefore, the annular spaces 171, 172 are always kept at high pressure. Therefore, the cylindrical portion 125'' receives an upward force.The reaction force of the above force is absorbed by the pressure within the annular space 172. Therefore, the large diameter portion 161
Only the cylindrical portion 125 receives an upward force while substantially no force is applied to it.

Since this force is 180 degrees different from the downward force acting on the end plate 123, the downward force applied to the end plate 123 is eventually reduced, and this reduction prevents the occurrence of the seizure phenomenon, resulting in the above-mentioned effect. will be obtained.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a conventional device of this kind, Fig. 2 is an explanatory diagram of the Oldham mechanism incorporated in the device, Fig. 3 is a diagram illustrating the compression principle of the device, and Fig. 4 FIG. 5 is a longitudinal sectional view of a scroll type compression device according to an embodiment of the present invention;
,) is a bottom view of the fixing element in the device, Figure 6(b) is a sectional view taken along line A-A in (,) and viewed in the direction of the arrow, and Figure 6(,) is the same. Top view of movable elements in the device, B-B in Figure (b) foil + 1)
7 is an enlarged cross-sectional view showing only the essential parts of the device. 101... Airtight container, 102... Frame, 2...
・Scroll type compression mechanism, 104...Motor, 105
...Lubricating oil, 111... Fixed element, 112... Movable element, 115, 124... Scroll blade, 116...
...Discharge hole, 130...Oldham tll! , Structure, 14
1... Bearing hole, 142... Annular groove, 146...6
．． 147... Hole, 160... Rotating shaft, 161...
Large diameter part, 164... Hole for centrifugal ponzo, 171, 17
2... Annular space, 176.179... Hole, 180,
182... Space, 181... Suction pipe, 183...
discharge pipe. Applicant's agent Patent attorney Hiko Suzu

Claims (1)

[Claims] A scroll-type compression mechanism consisting of a fixed element and a movable element, each of which is joined in the axial direction to form a compression chamber therebetween, and each of which has scroll blades that engage with each other within the compression chamber. is housed in a sealed container with the fixed element on the upper side and the movable element on the lower side, and the motor installed at the lower part of the sealed container is placed under the condition that the lower surface side of the movable element is in a low pressure atmosphere. A scroll-type compression device that compresses gas by causing the movable element to be guided by an Oridum mechanism using power and performing a rotational movement without rotation, a cylindrical portion protruding from the lower surface of the movable element; J+1−/+upper h
b l-> ノ, +, white 1+ L West" 101 needle shaft C4dt BM lrIt has a large diameter part provided and a bearing hole for supporting the rotating shaft in the center part, and is fixed to the sealed container. a first frame and a second frame provided in a relationship closed by each of the elements, between the upper surface of the large diameter portion and the lower end of the cylindrical portion, and between the lower surface of the large diameter portion and the frame; and a gas guide path for guiding high pressure gas in the compression chamber into the first and second annular spaces through the movable element and the small shaft. compressor.