JPS61226587A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To prevent an introduced gas into a combustion chamber from overheating and improve volumetric efficiency by providing an oil feeding passage which connects a space to a suction chamber, in a position different from a gas suction passage connecting said space of a low pressure atmosphere at the back of a movable element to said suction chamber. CONSTITUTION:A low pressure gas is sucked into a low pressure port in a compression chamber P via a suction pipe 181, a space 180 for a low pressure atmosphere on the back side of a movable element 112, a suction pipe 182, and a suction chamber R, establishing the gas suction passage of a compressor. On the other hand, a lubricating oil 105 is scooped up to the upper part inside the port 164 of a centrifugal pump, accompanying the rotation of a motor 104 and, after lubricating the inner periphery of the bearing bore 141, lubricates the fitted part between a small shaft 162 and a cylinder part 125, and then, a part in which an Oldham mechanism 130 is provided, via a port 187. Further, part of said lubricating oil 105 is sucked into the suction chamber P via an oil quantity controlling port 126 formed on the peripheral part of a panel board 123. Thus, a gas suction passage is separated from a lubricating passage, preventing a sucked gas from overheating and improving volumetric efficiency.

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 its problems]

Conventionally, a scroll type pressure N device is known as a low pressure compression device. 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 in a form that vertically partitions the inside of the sealed case, a scroll type compression mechanism is arranged above the frame, and a scroll type compression mechanism is arranged below the frame. A motor is installed to provide driving power, and lubricating oil is stored in the bottom of the sealed case. A scroll-type compressor is usually composed of a fixed element having a protruding scroll mold, and a movable element disposed below the fixed element and having a protruding scroll blade that 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 a scroll type compression device configured in this way, the space where the motor is installed is normally used as a gas-liquid separator, so the bottom side of the movable element is exposed to a low pressure atmosphere, and the top side of the fixed element is exposed to a low pressure atmosphere. A flow path configuration is adopted in which the side is in a high-pressure atmosphere.

By the way, in such a scroll type compression device, sliding losses between the scroll blades of the movable element and the head plate of the fixed element and between the scroll blades of the fixed element and the head plate of the movable element are reduced, and these losses are also reduced. In order to improve the sealing performance between compression chambers, it is necessary to supply an appropriate amount of lubricating oil to the inside of the compression chamber. For this reason, conventionally, a gas supply path was provided alongside the lubrication path of the rotating shaft and the eccentric coupling mechanism, and lubricating oil was simultaneously supplied into the compression chamber by the gas pressure when gas was supplied to the compression chamber.

However, this system has the disadvantage that the volumetric efficiency decreases because the gas is superheated by the oil present in the lubrication path and this superheated gas is introduced into the compression chamber.

Therefore, in order to solve this problem, it has been proposed that the gas suction path is provided at a position completely different from the lubrication path of the compression mechanism, for example, on the side surface of the fixing element. Since this device can compress relatively low-temperature gas, it is possible to improve volumetric efficiency and increase capacity.

However, in this case, the only oil that can be supplied into the compression chamber is the lubricating oil that is scattered inside the closed container, so the amount of oil to be filled becomes extremely small.

As a result, the lubrication performance and sealing performance between each scroll blade and each mirror surface deteriorate, resulting in a reduction in performance.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and its purpose is to operate with a low pressure atmosphere on the outer surface side of the movable element, which causes a decrease in volumetric efficiency during gas compression. To provide a scroll type compression device which can always supply an appropriate amount of lubricating oil to a compression chamber without causing any problems.

[Summary of the invention]

The present invention provides a scroll type compression device that operates with a space on the back side of a movable element in a low-pressure atmosphere and a space on the back side of a fixed element in a high-pressure atmosphere, in which the space in the low-pressure atmosphere and the suction chamber are operated. The present invention is characterized in that an oil supply path that communicates the low-pressure atmosphere space and the suction chamber is provided at a position different from the gas suction path that communicates with the suction chamber.

〔Effect of the invention〕

With the above configuration, since the gas supply route and the lubrication route are separated, overheating of the intake gas can be suppressed and the volumetric efficiency during compression can be improved. Moreover, according to the present invention, since a lubricant oil supply route to the suction chamber is provided separately from the gas supply route, it is possible to supply an appropriate amount of lubricant oil to the compression chamber via this oil supply route. become. For this reason, the 1lII sliding and sealing performance between each scroll blade and each mirror surface is also improved, and this also increases the volumetric efficiency.

Therefore, in the present invention, these effects can be combined to improve the performance of the device.

[Embodiments of the invention]

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

In FIG. 1, reference numeral 101 denotes a vertically long sealed case. A frame 102 is fixed at an upper position within this sealed case 101.

A scroll type compression mechanism is installed above the frame 102, and the scroll type compression mechanism is installed below the frame 102. A motor 104 for providing driving power to the jlIm 103 is fixed, and furthermore, lubricating oil 105 is housed in the bottom of the sealed case 101.

Scroll type pressure 4! i! 44@103 is composed of a fixed element 111 and a movable element 112 arranged below the fixed element 111, similar to the known one.

The fixing element 111 includes a disc-shaped end plate 113 and this end plate 1.
13; a scroll blade 115 protruding from a portion surrounded by the annular wall 114 at approximately the same height as the annular wall 114; It is composed of a discharge port 0116 provided in the center. A small cap 117 for gas-liquid separation is fixed to the upper surface of the mirror plate 113, which forms a predetermined small space above the discharge port 116 and has a hole 111a in its side wall. The fixing element 111 configured in this way has an annular wall 114 and a scroll blade 11.
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 ring 5 facing downward. Note that a cap 119 is applied to the top surface of the fixing element 111 during fixation, and this cap 11
9 is also integrally fixed by the bolt 118.

The cap 119 encloses the small cap 117 and forms a high-pressure space 120 between it and the upper surface of the end plate 113. Further, a notch 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 mirror plate 123 having an outer diameter slightly larger than the inner diameter of the annular wall 114;
a scroll blade 124 protruding from one surface of the scroll blade 124 at a height substantially equal to the height of the scroll blade 115; and a mirror plate 123.
A cylindrical portion 125 protrudes from the center of the other side of the figure. An oil wall control hole 126 that communicates between the upper and lower surfaces of the end plate 123 is bored in the peripheral edge of the end plate 123. The movable element 112 configured as described above is moved upward with the direction in which the scroll blades 124 protrude from the scroll! 1124 and the scroll blade 115 mesh with each other,
In addition, the peripheral portion of the mirror plate 123 and the end face of the annular wall 114, the end face of the scroll m124, the mirror plate 113, and the end face of the scroll blade 115 are mounted so that they are in layered contact with each other, and in this mounted state, the mirror plate 123 and the frame 102 It is held by an Oldham mechanism 130 provided between.

The Oldham mechanism 130 consists of key grooves 13) 8 and 13) 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 this key groove 13) 8. .13) Key grooves 132a and 132b provided on a line perpendicular to the arrangement direction of b and on the upper surface of the frame 102 as shown in FIG. a key 124a having keys 133a and 133b that fit into the key grooves 132a and 132b on the other surface;
124b and a ring 135.

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, on the inner surface of each of the key grooves 132a, 132b, 13)a, and 13)b, there is a bottle spout for reducing the sliding area with the key, as shown in FIG. 6 by the key groove 132b. Stepped portion 137
is formed.

The frame 102 has a flange 101 formed by slightly protruding the inner surface of the side wall of the sealed case 101 in the radial direction.
A, and is specifically configured as shown in FIG. That is, a bearing hole 141 eccentric to the axis of the cylindrical portion 125 of the movable element 112 is provided in the center of the frame 102 so as to penetrate in the vertical direction. Furthermore, a cylindrical body 140 is disposed coaxially with the bearing hole 141 at the outermost side of the frame 102 . This cylindrical body 140 has an outer diameter that can form a predetermined annular space with the inner surface of the sealed case 101, and has an inner diameter larger than the inner diameter of the annular wall 114 on the upper end side, and a The wall 114 forms an annular wall 142 that is fastened and fixed with bolts 118, and supports the motor 104 at its lower end. On the inside of the annular wall 142, a surface 144a for receiving the peripheral part of the lower surface of the mirror plate 123 via the annular groove 143 is formed with a lower surface 144a, and on the inside of the annular wall 142 for receiving the ring 135, a surface 144b is formed.
is further lowered by one step, and a surface 144C is formed on the inner side of the annular receiver that is further lowered by one step to receive a thrust force reduction mechanism 149, which will be described later. The surface of the 8-receiver is divided into a plurality of parts in the circumferential direction by grooves 145 provided radially, and at least one of the grooves 145 communicates with a hole 14G provided in the wall of the frame 102 that directly connects the inside and outside. ing. Further, a plurality of mounting arms 147 are provided on the outer peripheral surface of the annular wall 142 in a circumferential direction, and these mounting arms 147 are fixed to the upper surface of the flange 101a on the inner surface of the sealed case 101 with bolts 148. has been done. Note that the key grooves 132a, 132t
+ indicates that the receiver is formed on the surface 144b.

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 top surface of the annular body 150, and an annular groove 152 shallower and narrower than the annular groove 151 formed on the inside and outside of the annular groove 151 on the top surface, respectively.
, 153, and seal rings 154, 155 made of, for example, tetrafluoroethylene, which are mounted in these annular grooves 152, 153 so that a portion thereof projects outward, respectively. A tapered surface is formed at the lower end of the outer circumferential surface of the seal ring 154, as shown in FIG. There is. In addition, the groove 151
Bottomed holes 157 are formed at four circumferential positions to communicate the groove 151 with the annular grooves 152 and 153 at the same depth as the groove 151.

Further, a thrust force reduction mechanism 1 is provided inside the end plate 123.
49 is attached as shown in FIG.
50, the inner and outer seal rings 152 and 153, and the lower surface of the end plate 123.
A hole 15 that communicates with the high-pressure boat S and the medium-pressure boat S'
8, 159 are formed.

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.
1, a small shaft 162 that fits into the cylindrical portion 125 described above is provided in a protruding manner. The rotary ring 160 is formed in such a length that its lower end penetrates into the lubricating oil 107, 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 pumping up 5. The shape of the entrance part of this hole 164, that is, the part located at the lower end of the rotating shaft 160, includes a part 165 extending upward from the center of the lower end surface of the rotating shaft 160, and a lower bearing 163 extending radially from this part IG5. A combination of a portion 168 extending to the inner surface of the shaft, a portion 167 extending downward from this portion 186, and a portion 16 extending radially from this portion 167 by a length slightly shorter than the diameter of the rotating shaft 160. It has become.

The motor 104 has a rotor 170 inside and a stator 1
71 on the outside, and the stator 170 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, a suction pipe 181 that supplies gas to the annular space 180 between the inner surface of the side wall and the outer peripheral surface of the cylindrical body 140 of the frame 102 is connected to the side wall of the sealed case 101, and the fixing element 111 annular wall 114 and cap 1
19 is connected to a suction pipe 182 that communicates between the outer space of the cap 119 and the compression chamber P, and the upper wall of the cap 119 and the upper wall of the sealed case 101 are connected to the space 120. A discharge pipe 183 for discharging compressed gas from is connected.

In addition, 184 in FIG. 1 is an annular wall 1 for returning the lubricating oil pushed out into the space 120 downward from the frame 102.
14 and the holes provided in the frame 102 are shown, and 18
5 indicates a balance weight, 18G 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.
It is smoothly held by both bearings of 63.

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 small shaft 162 provided eccentrically with respect to the rotating shaft 160.
Moreover, since it is supported by the Oldham mechanism 130, the movable element 112 performs a turning motion without rotation. Therefore, the scroll blades 124 provided on the movable element 112 also perform a swirling motion. Along with this swirling movement, the volume of the compression chamber P formed between the scroll blade 115 and the scroll vIt124 is periodically reduced, and thereby compressed gas is discharged from the discharge 0116. The discharged high pressure gas flows from the gap formed by the small cap 117 to the hole 1 provided in the small cap 117.
178 to the high pressure space 120 and is sent out from the discharge pipe 183.

On the other hand, the suction chamber R located at the periphery of the compression chamber P has a suction pipe 1
Since the movable element 112 is in communication with the annular space 180 inside the sealed case 101 via the air filter 82, when the movable element 112 makes the pivoting movement as described above, the volume of the suction chamber R changes periodically, causing the gas in the annular space 180 to change. is sucked into the suction chamber R. In addition, since the suction pipe 182 communicates with the suction pipe 181 via the air 180, the low pressure gas ends up in the compression chamber P via the suction pipe 181, the space 180, the suction pipe 182, and the suction R. They will be sucked into a low-pressure boat,
A gas suction path for the compression device is established here. In this case, even if liquid such as refrigerant is mixed in the low-pressure gas that has flowed in through the suction pipe 181, this liquid will not flow into the annular space 1.
While moving within the lubricating oil 80, it falls downward and tries to move to the bottom where the lubricating oil 105 is stored. Since the motor 104 generates heat by itself, the falling liquid is gasified by the heat, mixes with the flow of the already gasified liquid, and is compressed! Move into 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 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 portion where the Oldham mechanism 130 is provided is lubricated through the hole 181.

Since an oil amount control hole 126 is formed in the peripheral edge of the mirror plate 123, the pressure in the suction chamber R periodically decreases below the pressure in the space on the back side of the mirror surface 123, thereby lubricating the Oldham mechanism 130. A portion of the lubricating oil is sucked into the suction chamber P through the oil amount control hole 126. Also,
The remaining lubricating oil flows downward from the hole 146. The lubricating oil that has entered the compression port P finally reaches the discharge port 1.
After being discharged from the cap 119, it flows downward through the holes 122 and 184 provided in the cap 119. Therefore, high-pressure gas containing no lubricating oil is discharged from the discharge pipe 183. The above is the oil supply route to the compression chamber P.

In this way, according to this embodiment, the gas supply route is provided at a completely different position from the oil supply route, so the compression chamber P
It is possible to prevent overheating of the gas introduced into the interior, and it is possible to improve the volumetric efficiency during compression.

By the way, in general, in this type of system in which gas is sucked from the side surface of the fixing element 111, the lubricating oil scattered inside the sealed case 101 is guided into the suction chamber R, so that the lubricating oil is compressed. There is a drawback that the amount of oil in the chamber P is reduced. However, according to this embodiment, the oil amount control hole 126 provided in the movable element acts effectively and always supplies an appropriate amount of lubricating oil into the compression chamber P, so that each scroll blade 115, 125 and each The lubrication and sealing performance between the mirror plates 113 and 123 will not deteriorate.

Therefore, these effects combine to enable extremely efficient compression operation.

In addition, as the gas is compressed in the compression 'JP, the movable element 11
A thrust force is applied to the fixing element 2 in a direction away from the fixed element 11, but this is alleviated by the thrust force reduction mechanism 149.

Although typical embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

For example, in the above embodiment, the end plate 113 of the movable element 112 is provided with the oil volume control hole 126, but as shown in FIG. Even if an oil amount control hole 2) 1 is provided that communicates the space surrounded by the periphery of the compression chamber P with the peripheral edge of the compression chamber P, the same effects as in the embodiment described above can be achieved.

Furthermore, the means for lubricating the compression chamber P is not limited to the oil quantity control hole, but for example, as shown in FIG.
Lubrication may be performed through a gap formed between the notch 2) 2 provided at the peripheral edge of the annular wall 114 of No. 11 and the peripheral edge of the mirror surface 123.

It goes without saying that the present invention can also be applied to so-called horizontal type devices in which the motor is disposed above the movable element, or in which the axis is horizontal.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a scroll-type compression stomach according to an embodiment of the present invention, FIG. 2 is a bottom view of a fixed element in the device, FIG. 3 is a top view of a movable element in the device, and FIG. The figure is a partially cutaway exploded perspective view showing only the upper part of the frame in the same device, Figure 5 is a plan view of the main parts of the Oldham mechanism in the same device, and Figure 6 explains 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 device, Figure 7 (b) is a vertical sectional view of the thrust force reduction mechanism, and Figure 7 (C) is a diagram of the mechanism. 8 and 9 are longitudinal sectional views showing a part of a scroll type compression mechanism according to other embodiments of the present invention, respectively. 101... Airtight case, 102... Frame, 10
3...Scroll type compression mechanism, 104...Motor,
105...m lubricating oil, 111...fixing element, 112...
...Movable element, 115, 124...Scroll 99
．． 116... Discharge port, 126, 2) 1... Oil amount control hole, 130... Oldham mechanism, 139... Thrust force reduction mechanism, 141... Bearing hole, 150... Annular body, 151... Annular groove, 154... Inner seal ring, 155... Outer seal ring, 158.159.
... Hole as a communication path, 160 ... Rotating shaft, 163.
... Secondary bearing, 164 ... Hole for centrifugal pump, 170.
...Rotor, 171...Stator, 174...Reversal prevention structure, 180...Annular space, 181, 182...
・Suction pipe, 183... Outlet pipe, 2) 2... Notch,
P... Compression chamber, Q... Annular space, R... Suction chamber. Applicant's Representative Patent Attorney Takehiko Suzue Figure 2 Figure 3 Figure 4 Figure 5 jI6 Figure 7 (α) (C) Figure 8 Figure 9

Claims (4)

[Claims] (1) Fixtures each having a shape that slides into contact with each other at multiple points and forming a compression chamber between them and a suction chamber around the compression chamber, and each having scroll blades that engage with each other within the compression chamber. A scroll-type compression mechanism consisting of an element and a movable element is disposed in a sealed case, and the movable element is compressed by the power of a motor provided in the sealed case under the condition that the space on the back side of the movable element is a low-pressure atmosphere. In the scroll type compression device, the scroll type compressor is configured to perform gas compression by making a circular motion without rotation; A scroll-type compression device characterized in that an oil supply path is provided that communicates a space in a low-pressure atmosphere with the suction chamber. (2) The scroll type compression device according to claim 1, wherein the oil supply path is an oil amount control hole provided in the movable element. (3) The scroll type compression device according to claim 1, wherein the oil supply path is an oil amount control hole provided in the fixed element. (4) The oil supply path is a gap formed between the fixed element and the movable element by a notch provided in at least one of the fixed element and the movable element. Scroll type compression device according to item 1.