JPS61268889A - Scroll type compression equipment - Google Patents

Abstract

PURPOSE:To preclude a phenomenon of seizure at the time of the high-speed rotation of a vane by forming the outer periphery surface of a disc-shaped end plate provided with a scroll vane as a movable vane projecting out from its surface and making swing motion by a motor and the sliding-contact surface of the frame side part opposite to said surface into prescribed tapered surfaces. CONSTITUTION:The captioned equipment is provided with a scroll type compression mechanism 103 which comprises a fixed element 111, in which a scroll vane 115 is mounted on the one side face of a disc-shaped end plate 113 such that the vane projects out from the surface, and a movable element 112 located opposite to said fixed element, and comprising a scroll vane 124 mounted on the one side face of a disc-shaped end plate 123 such that the vane projects out from the surface. Said mechanism 103 is placed in a closed case 101, and driven by a motor 104 which is located below the case. Hereupon, the end plate 123 is formed into a tapered surface 123a in such a manner that the external shape of its periphery surface becomes larger the more it approaches the fixed element 111 side, and the outer periphery surface of said end plate is formed with dimensions such that, at the time of being in swing motion, it can come into sliding contact with a tapered surface 142a within the internal surface of an annular wall 142 of a frame 102 which divides the inside of the closed case 101 into the upper and lower parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical 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 case.

[Technical Background of the Invention and Problems Therewith] 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
A frame is fixed at a position slightly above the sealed case to partition the inside of the case vertically, a scroll type compression mechanism is arranged above the frame, and a scroll type compression mechanism is arranged below the frame. A motor is arranged to provide driving power to the compression mechanism, and lubricating oil is stored in the bottom of the sealed case. A scroll-type compression mechanism is usually composed of a fixed element having a protruding scroll blade, and a movable element having a protruding scroll blade, which is disposed below the fixed element and meshes with the scroll blade.

A bearing hole is provided vertically through the frame, and the rotating shaft of the motor described above is rotatably supported by the bearing hole.

Further, an eccentric coupling mechanism and an Oldham mechanism are provided between the upper end of the rotating shaft and the movable element, and the eccentric coupling mechanism and Oldham mechanism cause the movable element to perform a turning motion without rotation.

In this type of compression device, the movable element makes an eccentric movement, and therefore a large centrifugal force acts on the movable element in the eccentric direction. Therefore, it is impossible to avoid a relatively large load being applied to the bearing portion of the rotating shaft and the eccentric coupling mechanism in the eccentric direction. For this reason, especially when attempting to increase the rotation speed of this type of compression device, there is a concern that an excessive load may be applied to the bearing portion due to excessive centrifugal force, resulting in the occurrence of a seizure phenomenon.

[Purpose of the invention]

The present invention was made in view of these circumstances, and its purpose is to provide a scroll-type compression system that can achieve even higher rotation speeds without causing seizure even during high-speed rotation. The goal is to provide equipment.

[Summary of the invention]

In the present invention, a movable element and a fixed element are slidably contacted at a plurality of places to form a compression chamber between the two, and the movable element and the fixed element are provided with scroll blades that engage with each other inside the compression chamber. A scroll compression mechanism is housed inside a sealed case, and power of a motor disposed in a space on the side of the movable element inside the sealed case is transmitted to the movable element via an eccentric coupling mechanism so that the movable element does not rotate on its axis. In a scroll-type compression device that compresses gas by rotating the movable element, the outer circumferential surface of a disc-shaped end plate that supports the scroll blade on the movable element side is slid onto the frame side portion opposite thereto. The sliding contact surfaces of the end plate and the frame side portion are formed into a tapered surface such that the diameter of the end becomes wider on the fixed element side.

(Effects of the Invention) With the above configuration, since the outer circumferential surface of the mirror plate is in sliding contact with the fixed side part, the centrifugal force acting on the movable element is applied to the outer circumferential surface of the mirror surface in addition to the bearing and the eccentric coupling mechanism. It becomes possible to receive it on the fixed side part through.

By the way, when a centrifugal force acts on the movable element, a moment acts on the movable element such that the movable element rotates about the bearing in a plane including the axis. Therefore, when the end plate moves eccentrically by the amount of clearance with the fixed side part due to centrifugal force, the above-mentioned moment acts and causes the end plate to be tilted with respect to the plane directly parallel to the axis. Therefore, if the sliding surface between the mirror plate and the fixed part is a cylindrical surface, the moving direction of the mirror plate and the normal direction of the surface from which it is obtained will not match, and as a result, the effect of reducing the load on the bearing part will not be sufficient. You will not be able to perform to your full potential.

However, according to the present invention, since the sliding surfaces of the end plate and the fixed side portion are formed in a tapered shape where the diameter becomes wider on the fixed element side, even when the above-mentioned moment acts on the movable element, , this can be reliably received by the tapered surface.

Therefore, according to the present invention, even during high-speed rotation, excessive centrifugal force does not concentrate on the bearing or the eccentric coupling mechanism as in the conventional case, so it is possible to prevent the seizure of the bearing or the like. This makes it possible to achieve even higher rotation speeds.

[Embodiments of the invention]

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

In FIG. 1, reference numeral 101 indicates a vertically elongated sealed case, and this sealed case 101 includes a cylindrical intermediate case 101a and a closed case welded to close both ends of the intermediate case 101a. 101b.

101C. A frame 102 is fixed at an upper position inside the sealed case 101 in a form that partitions the inside of the sealed case 101 in the vertical direction.

A scroll type compression mechanism pressure is disposed above the frame 102, and a motor 10 for providing driving power to the lateral pressure of the scroll type compressor is disposed below the frame 102.
4 is arranged, and m lubricating oil 105 is further housed at the bottom of the sealed case 101.

The scroll compressor lateral pressure is composed of a fixed element 111 and a movable element 112 arranged below the fixed element 111, as is known.

The fixing element 111 includes a disc-shaped end plate 113 and this end plate 1.
An annular wall 114 protruding from the peripheral edge of one surface of the mirror plate 13, a scroll blade 115 protruding from a portion surrounded by the annular wall 114 at a height approximately equal to the annular shape W114, and a mirror plate 1.
13 and a discharge port 116 provided approximately at the center of the discharge port 13. The inner edge of the annular wall 114 is a second
Notch surface 1 such as a tapered surface as shown in figures (a) and (b)
17 or a curved surface with an appropriate curvature. The fixing element 111 configured as described above is attached to the annular wall 1
The peripheral edge of the annular wall 114 is hermetically fixed to the upper peripheral edge of the frame 102 with bolts 118, with the direction in which the scroll blades 14 and scroll blades 115 project downward. Note that a cap 119 is applied to the upper surface of the fixing element 111 during fixation, and this cap 119 is also fixed integrally with the bolt 118. The cap 119 is the end plate 1
The hole 121 is formed in a part of the wall that forms this gap 120. Further, a hole 122 for guiding lubricating oil, which will be described later, is formed in a part of the side wall. On the other hand, the movable element 112 includes a disk-shaped end plate 123, a scroll blade 124 protruding from one surface of the end plate 123 at a height approximately equal to the height of the scroll blade 115, and It is composed of a cylindrical portion 125 protruding from the center. The mirror plate 123 is
The curved surface is formed into a tapered surface 123a such that the outer diameter is larger on the side of the fixing element 111, and the outer diameter on the side of the fixing element is slightly larger than the inner diameter of the peripheral edge of the annular wall 114. Further, the outer circumferential surface of the mirror surface is formed in such a size that it can come into sliding contact with a tapered surface 142a on the inner surface of an annular wall 142 of the frame 102, which will be described later, during the turning movement. 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 mirror plate 123 and the end surface of the annular wall 114 and the end face of the scroll blade 124 and the mirror plate 113, the end face of the scroll blade 115 and the mirror plate 123, and the outer peripheral surface of the mirror plate 123 and the tapered surface 14 on the inner surface of the annular wall 142 of the frame 102.
2a are attached so that they are in sliding contact with each other, and this attached state is maintained by an Oldham mechanism 130 provided between the end plate 123 and the frame 102.

The Oldham mechanism 130 has key grooves 131a and 131'b provided at two locations on the same line drawn through the center of the mirror plate 123 at the lower peripheral edge of the mirror plate 123, and the arrangement direction of the key grooves 131a and 13τb. key grooves 132a and 132b provided on the upper surface of the frame 102 on a line orthogonal to the frame 102 as shown in FIG. 133a, 133b, and a key 1 that fits into the key grooves 132a, 132b on the other side.
24a and 124b. In fact, as shown in FIG. 5, on both sides of the ring 135, for example, mesh-shaped oil grooves 136 are formed to reduce sliding resistance. Further, each of the key grooves 132a, 132b, 131a, 13
An enlarged step 137 is formed on the inner surface of 1b to reduce the sliding area with the key, as represented by a keyway 132b in FIG.

The frame 102 includes a cylindrical portion 1 of the movable element 112.
A bearing hole 141 that is eccentric with respect to the axial center line of 25 is provided to penetrate in the vertical direction,
The portion located on the 25 side is formed to have a large diameter. The frame structure on the larger diameter side is specifically constructed as shown in FIG.

That is, an annular wall 142 is formed on the outermost side, which has an outer diameter approximately equal to the inner diameter of the sealed case 101 and has an inner diameter larger than the inner diameter of the annular wall 114, and in which the annular M114 is tightened and fixed by the bolt 118. has been done. A tapered surface 142a is formed on the inner surface of this annular wall 142 at a position facing the outer circumferential surface of the mirror surface 123 so that the inner diameter becomes wider on the side facing the fixing element 11. and,
On the inside of the annular wall 142, a surface 144 is formed to receive the lower surface of the end plate 123 through an annular groove 143, and a surface 144 is formed on the inside of the annular wall 142 to receive the ring 135. A surface 146 is formed on the annular receiver which is formed to be roughly lowered by one step, and which is further lowered by one step inside to receive a thrust force reduction mechanism 149 which will be described later.

The surface of the banake is divided into a plurality of parts in the circumferential direction by grooves 147 provided radially, and at least one of the grooves 147 communicates with a hole 148 provided in the wall of the frame 102 that directly communicates the inside and outside. ing.

Note that the key grooves 132a and 132b have a receiving surface 14.
5.

Specifically, as shown in FIGS. 7(a), 7(b), and 7(c), the main parts of the thrust force reduction mechanism 149 are as follows: An annular groove 151 carved on the upper surface of the annular body 150, annular grooves 152, 153 shallower and narrower than the annular groove 151 formed on the inside and outside of the annular groove 151 on the upper surface, and these annular grooves 152, 153. It is comprised of seal rings 154 and 155 made of, for example, tetrafluoroethylene, which are mounted inside so that a portion thereof projects outward, respectively. The lower end of the outer circumferential surface of the seal ring 154 is shown in the same figure (C).
), 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. Further, at four positions in the circumferential direction of the groove 151, the groove 1 has the same depth as the groove 151.
A bottomed hole 157 is formed that communicates the annular groove 51 with the annular grooves 152 and 153. Inside the end plate 123, the annular body 151 and the seal ring 15 are installed with the thrust force reduction mechanism 149 installed as shown in FIG.
Holes 158 and 159 are formed so that the annular space Q surrounded by the lower surface of the mirror plate 123 and the lower surface of the end plate 123 is always communicated with the high pressure boat S and the medium pressure boat S' of the compression chamber P.

The motor 1 is inserted into the bearing hole 141 of the frame 102.
04 rotation shaft 160 is rotatably supported.

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.
A crankshaft 162 is provided protruding from 1. This crankshaft 162 is fitted into the aforementioned cylindrical portion 125 and is inserted into the cylindrical portion 125.
25 constitutes an eccentric connection mechanism. The rotary ring 160 has a length such that its lower end penetrates into the lubricating oil 105, and the lower end is supported by a sub-bearing 163 fixed to the inner surface of the sealed case 101 via a bearing support member 200. Supported.

In addition, lubricating oil 10 is provided inside the rotating shaft 160 by the action of a centrifugal pump.
A hole 164 for drawing up the cylindrical portion 5 is formed in the bearing surface or the fitting portion between the crankshaft 162 and the cylinder portion 125. This hole 16
The shape of the inlet portion of No. 4, that is, the portion located at the lower end of the rotating shaft 160, includes a portion 165 extending upward from the center of the lower end surface of the rotating shaft 160, and a portion 165 extending radially from the inner surface of the lower bearing 163. It is a combination of a portion 166 that extends up to 1, a portion 167 that extends downward from this portion 166, and a portion 168 that extends radially from this portion 167 by a length slightly shorter than the diameter of the rotating shaft 160. There is.

The motor 104 has a rotor 170 inside and a stator 1
11 on the outside, and the stator 110 is placed on the intermediate case 10.
It is composed of a squirrel-cage induction motor fixed to the inner surface of 1a.

On the other hand, a ratchet-type reversal prevention mechanism 174 is provided between a balance weight 173 protruding from the upper end of the rotor 170 of the motor 104 and the frame 102.

Furthermore, the scroll type compression mechanism 103 and the motor 104 are connected to the side wall of the intermediate case 101a of the sealed case 101.
A suction pipe 181 is connected to a portion located between the lateral pressure of the scroll type compressor and the motor 104 so as to communicate with the air fi 1180. , a discharge pipe 183 is in communication with the space 182 formed between this wall and the fixing element 111.
is connected.

In addition, 184 in FIG. 1 is an annular wall 1 for returning the lubricating oil pushed out into the space a 182 downward from the frame 102.
14 and the holes provided in the frame 102 are shown, and 18
5 indicates a balance weight, 18B indicates a connection mechanism for power supply to the motor 104, and 187 indicates 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 160 starts rotating. This rotation is caused by the bearing hole 141 and the secondary bearing 1.
63 double bearings ensure smooth maintenance.

The rotational force of the rotating shaft 160 is then transmitted to the movable element 112. The cylindrical portion 125 of the movable element 112 is fitted with a crankshaft 162 provided eccentrically with respect to the rotating shaft 160, and is supported by the Oldham mechanism 130, so that the movable element 112 does not rotate on its own axis. Make a turning movement. On the other hand, when the movable element 112 makes a pivoting movement,
The scroll blades 124 provided on the movable element 112 also perform a swirling movement. Along with this swirling movement, the volume of the compression chamber P formed between the scroll blades 115 and the scroll blades 124 is periodically reduced, and the compressed gas is thereby discharged from the discharge port 116. The discharged high pressure gas flows through the gaps 120 to 120 formed by the cap 119.
It is sent out from the discharge pipe 183 through the hole 121 provided in the cap 119 and the space 182. On the other hand, when the movable element 112 pivots as described above, the annular shape of the fixed element 111! ! The fact that the cutout surface 117 is formed on the inner edge of the compressed IP 114 is effective, so that the receiver whose peripheral edge of the compressed IP is formed on the frame 102 is always in communication with the space above the surface 145. . The above space is frame 10
The hole 148 is connected to the suction pipe 181 through the space 180, so the low-pressure gas eventually flows from the suction pipe 181 to the space. 180 to hole 148 to the receiver are sucked into the low pressure boat in the compression chamber P via the space on the surface 145, and here the function as a pressure/line device is exhibited. In this case, even if liquid such as a refrigerant is mixed in 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 lubricating oil 10
Try to move to the bottom where 5 is accumulated. motor 104
Since the liquid is self-heating, 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.

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 164 by the centrifugal pump action due to the shape of the hole 164. This pumped I! After sliding on the inner peripheral surface of the bearing hole 141, the lubricating oil lubricates the fitting part between the crankshaft 162 and the cylinder part 125, and then passes through the hole 187 to the Oldham mechanism 1.
30 is provided with 1 ffl, and furthermore, the space between the mirror surface 123 and the annular wall 142 is lubricated. Thereafter, a portion flows down from the hole 148, and the rest enters the compression chamber P to lubricate the sliding parts within the compression chamber P. Then, the lubricating oil that has entered the compression chamber P is finally discharged from the discharge port 116 and then flows through the hole 122 provided in the cap 119.
and flows downward through hole 184. Therefore, high-pressure gas containing no lubricating oil is discharged from the discharge pipe 183.

By the way, when the rotational movement of the movable element 112 becomes high speed,
A large centrifugal force acts on the movable element 112 in an eccentric direction. Also, due to this, the rotating shaft 160 has a bearing hole 141.
A rotating moment acts in a plane centered on and including the axis. However, in the case of this embodiment, as shown in FIG.
Since the movable element 112 rotates while slidingly contacting the tapered surface 142a formed on the annular 1!142 of the second embodiment, the centrifugal force acting on the movable element 112 can be reliably received by the tapered surface 142a.

Therefore, an excessive load is not applied to a portion of the bearing hole 141, and the occurrence of seizure can be effectively prevented. Moreover, in this case, it is also possible to effectively prevent the so-called undulation of the movable element.

Such an effect can be achieved by forming at least a portion of the sliding surface into a tapered surface.

Note that the present invention is not limited to the embodiments described above. That is, in the above embodiments, the motor is placed below the movable element, but in the present invention, the motor is placed above the movable element, or the motor is used with the axis horizontal. It goes without saying that the present invention can also be applied to so-called horizontal devices, or devices in which the motor side is high pressure and the compression mechanism side is low pressure.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a scroll-type compression device according to an embodiment of the present invention, FIG. 2(a) is a bottom view of a fixing element in the same device, and FIG. Figure 3 is a cross-sectional view of the installation condition when cut along the line , and viewed in the direction of the arrow. Figure 3 (a) is a top view of the movable element in the same device, and Figure 3 (b) is
4 is a partially cutaway exploded perspective view showing only the upper part of the frame in the same device, and FIG. 5 is a plan view of the main part of the Oldham mechanism in the same device. Figure 6 is a diagram for explaining the shape of the keyway of the Oldham mechanism, Figure 7 (a) is a plan view of the thrust force reduction mechanism incorporated in the same device, and Figure 7 (b) is a diagram for explaining the shape of the keyway of the Oldham mechanism. A vertical cross-sectional view of the force reduction mechanism. Figure (C) is a cross-sectional view partially showing the seal ring incorporated in the mechanism. Volume number Figure 8 is C-- in Figure 1.
It is a C line cut arrow view. 101... Airtight case, 102... Frame, 10
3...Scroll type compression mechanism, 104...Motor,
105...Lubricating oil, 111...Fixing element, 112...
...Movable element, 115°124...Scroll wing, 1
16...Discharge port, 123...End plate, 123a, 1
42a River taper side, 130...Oldham mechanism, 139
... Thrust force reduction mechanism, 141 ... Bearing hole, 15
0... Annular body, 151, 152, 153... Annular groove, 154° 155... Seal ring, 158.1
59... Hole as a communication path, 160... Rotating shaft, 1
62... Crankshaft, 163... Secondary bearing, 164...
... Hole for centrifugal pump, 170 ... Rotor, 171.
... Stator, 174 ... Reversal prevention mechanism, 180, 1
82... Space, 181... Suction pipe, 183... Discharge pipe, P... Compression chamber, Q... Annular space. Applicant's agent Patent attorney Takehiko Suzue (a) (b) Figure 2 (a) (b) Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] A compression chamber is formed between a movable element having a movable side scroll blade integrally formed on one surface of a disc-shaped end plate and the movable element that is in sliding contact with the movable element at a plurality of locations, and the compression chamber is A scroll-type compression mechanism consisting of a fixed element having a fixed scroll blade that engages with the movable scroll blade is arranged in a sealed case, and a motor provided in a space on the movable element side in the sealed case is powered. In the scroll-type compression device, the gas is compressed by transmitting the pressure to the movable element via an eccentric coupling mechanism, and causing the movable element to perform a rotational motion without rotation. Scroll type, characterized in that the end plate and the fixed side portion are in sliding contact with each other, and the sliding surfaces of the end plate and the fixed side portion are formed into tapered surfaces such that the diameter of the sliding surface becomes wider toward the fixed element side. Compression device.