JPS60252185A - Scroll compressor - Google Patents

Abstract

PURPOSE:To reduce the mechanism and the size of compressor by mounting a turning board on the mirror board of turning scroll in the direction of the height of lap then feeding high pressure lubricant between the mirror board and the turning board thereby maintaining the thrust force while coupling the turning board with a spinning prevention mechanism. CONSTITUTION:A turning board 18 is fixed in the semi-circular and the circumferential directions through the mirror board 17a of a turning scroll 17 and a key but movable in the direction of the height of a lap 17b while a space 22 is formed between the turning board 18 and the mirror board 17a and the turning board 18 is coupled with a spinning prevention mechanism 6. Consequently, upon rotation of the electrical section 2, high pressure lubricant is fed through an oil supply hole 11b, an oil sump space 13 and a communication hole 23 into said space 22. As a result, the reaction of pushing force functioning against the thrust force caused through compressed gas is held by a thrust bearing 12 through the end of shaft 12 and the contacting section of the turning board 18 thus to operate the compressor efficiently. While since the shape and the dimension of the spinning prevention mechanism 6 can be set independently from the space 22, the size of the compressor can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scroll compressor used in a refrigeration cycle or the like, and more particularly to a scroll-type flea last support device that performs a rotating motion.

Conventional configuration and its problems The conventional configuration will be explained with reference to FIGS. 4 and 5. 1 is a sealed casing, 2 is an electric motor section, and a block 3. Fixed scroll 4. A mechanical part main body 7 composed of an orbiting scroll 6 and an anti-rotation mechanism 6 is fixed. The fixed scroll 4 is composed of an end plate 4a and an involute standing upright on the end plate 4a, or a flap 4b having a uniform thickness and a curve similar to an involute, and is fixed to the block 3 by the end plate 4a. Also, the orbiting scroll 5
is composed of an end plate 5a and a wrap 5b that stands upright and has the same curve as the wrap 4b of the fixed scroll 4, and is supported by being sandwiched between the end plate 6a, the end plate 4a of the fixed scroll 4, and the block 3 with a clearance A, Moreover, it is restrained by the rotation prevention mechanism 6. The fixed scroll 4 and the orbiting scroll 5 each have two knobs 4b and 5.
The end ends 4b' and 5b' of the windings 4b' and 5b' of the windings 4a and 5b are aligned with each other with a certain angle shifted.

8 is a discharge hole, and 9 is a suction hole. The discharge hole 8 is provided at the center of the involute of the fixed scroll 4, and the suction hole 9 is provided at the outer edge of the end plate 4a of the involute of the fixed scroll 4. 10 is a wrap 5b of the orbiting scroll 5
The protrusion provided on the opposite surface is concentric with the center of the involute of the wrap 5b. 11 is block 3
The electric motor section 2 is connected to the motor section 2 by housing the protrusion 10 of the orbiting scroll 5 in the boss section 11a, which is provided at the end of the seven mechanical section bodies and is eccentric from the center of the shaft. The orbiting scroll 5 is connected. There is an oil supply hole 11 in the center of the shaft 11.
b penetrates through the oil sump space 1 formed by the boss portion 11a of the shaft 11 and the protrusion 10 of the orbiting scroll 5.
3 and the lower part of the sealed casing 1 are communicated with each other. 14 is a back pressure chamber formed on the back surface of the orbiting scroll 5, and the wrap 5b side of the orbiting scroll 5 is an end plate Sa.

Clearance A in section 4a communicates with the low pressure section. 1
5 is a suction pipe communicating with the suction hole 9, and 16 is a discharge pipe.

1, 17 is the lubricating oil collected at the bottom of the sealed casing 1.

Next, the compression mechanism of the scroll compressor will be explained. The rotational movement of the shaft 11 accompanying the rotation of the electric motor section 2 is transmitted to the orbiting scroll 5 via the boss section 11a and the protrusion section 10, but due to the action of the rotation prevention mechanism 60, the orbiting scroll 5 does not rotate on its own axis and moves toward the fixed scroll 4. The center of the involute is rotated upward and closed during rotation. At this time,
Suction is complete when the end 5b' of the wrap 5b of the orbiting scroll 5 is in contact with the wrap 4b of the fixed scroll 4, and the end 4b' of the wrap 4b of the fixed scroll 4 is in contact with the wrap 5b of the orbiting scroll 5. As the orbiting scroll 5 revolves, the wrap 4b and the wrap 5b
As the two contact points approach the center of the involute, the pressure in the compression space S increases.

By the compression mechanism of this scroll compressor, the refrigerant sucked from the suction pipe 15 through the suction hole 9 is compressed and
After being discharged into the -H sealed casing 1 through the discharge pipe 16, it is discharged into a cooling system (not shown). At this time, as the pressure in the compression space S increases, a thrust force is generated between the fixed scroll 4 and the orbiting scroll 5 that tends to separate them in the axial direction. Fixed and orbiting scroll 4
If ゜6 is pulled apart by this thrust force, the axial ends of the wraps 4b and 6b in contact with the mirror plates 4a and 5a will become incomplete, resulting in increased leakage and a decrease in vehicle resistance. Conventionally, in the back pressure chamber 14 on the back side of the orbiting scroll 5,
Low pressure is introduced through the clearance A, and high-pressure lubricating oil in the sealed casing 1 is introduced into the oil sump space 1.3 through the oil supply hole 11b of the shaft 11, and the orbiting scroll 5 is supplied with compressed gas. Pressing more than the thrust force was giving force. That is, the end plate 5a of the orbiting scroll 5
The total area is A, the area of the protrusion is A1, and the high pressure is PH1.
When the low pressure is PL, F = PHxA1 + PLX (
The pressing force in A-A1) was adjusted so that it was greater than the thrust force caused by the compressed gas. The reaction force of the pushing force F is supported by the thrust bearing 12.

However, with this method, under any operating conditions, if you try to maintain a force greater than the thrust force of the compressed gas,
It is necessary to increase the area A1 of the protrusion 10, and there is a problem in that the compressor becomes larger due to the larger diameter of the anti-rotation mechanism.

Purpose of the Invention The present invention eliminates the drawbacks of the conventional example described above, and is capable of supporting the thrust force acting on the orbiting scroll under any operating conditions, and also makes the rotation prevention mechanism small and independent of the thrust force support mechanism. This makes it possible to downsize the compressor.

Structure of the Invention The present invention includes a rotating plate movable in the height direction of the ramp attached to the end plate of an orbiting scroll, high-pressure lubricating oil or gas is introduced between the end plate and the rotating plate to maintain thrust force, and By connecting the plate to the rotation prevention mechanism, the rotation prevention mechanism and the compressor can be miniaturized. ○ Description of an embodiment An embodiment of the present invention will be described below using FIGS. 3, 4, and 5. Note that the same parts as in the conventional example are given the same reference numerals and detailed explanations will be omitted.

1T is an orbiting scroll and has a wrap 17b of the same shape as the conventional one standing upright on an end plate 17a. 18 is a rotating plate, a mirror plate 17a of the rotating scroll 1 and a key 19a, 1
9b, 19C, and 19d are fixed in the radial and circumferential directions, but it is movable in the height direction of the plate 17b. The rotating plate 18 connects the shaft 11 via the protrusion 20.
and the storage groove 21a of the rotation prevention mechanism 6.
.

21b is provided on the protrusion 2o side. A space 22 is formed between the trench turning plate 18 and the end plate 1a, and by fitting the end plate 17a and the turning plate 18, the space 22 is separated and sealed from the back pressure chamber 14, and the space 22 is communicated with each other. It communicates with the oil reservoir space 13 via the hole 23.

The upper surface 11C of the first saw shaft 11 and the turning plate 18 are in contact with each other, and the shaft 11 is held on a thrust bearing 12.

In the above configuration, when the main body 7 of the machine is rotated by the rotation of the electric machine part 2 and operates t7, the refrigerant gas sucked in through the suction hole 9 as in the conventional case is compressed in the compression space S and inside the sealed casing 1. After being discharged into the chamber 1a, it is discharged through a discharge pipe 16 to a cooling system (not shown in FIG. 1).

Then, low pressure is introduced into the back pressure chamber 14 as in the conventional case, and the oil supply hole 11b, oil reservoir space 13, and communication hole 23 are
High-pressure lubricating oil is introduced into the space 13 via. As a result, the pressing force acting against the thrust force of compressed gas is force Fd:, area A of end plate 17a, area A1 of space 22, high pressure PH1 low pressure PL, then F= PHxA,
+P, x (A-A1) 9 The reaction force of the pressing force F is held by the thrust bearing 7 through the contact portion between the shaft tip 11c and the rotating plate 18. Therefore, by optimizing the area A of the space 22, it is possible to easily set the pressing force F to be greater than the thrust force in any operating state, and the compressor can be operated efficiently. Further, unlike the conventional art, the shape and dimensions of the rotation prevention mechanism 6 can be set independently of the space 22, so that the rotation prevention mechanism 6 can be optimized and the compressor can be downsized.

Effects of the Invention As is clear from the above description, the present invention comprises two mutually interlocking orbiting scrolls and a fixed scroll each having a wrap that stands upright on an end plate, and a fixed scroll that is attached to the orbiting scroll and is movable only in the height direction of the wrap. A rotating plate, an anti-rotation mechanism that prevents rotation of the orbiting scroll through the rotating plate and allows the orbiting movement to occur, and a space formed between the back surface of the orbiting scroll on the opposite side of the wrap and the rotating plate, and the space communicates with the high pressure section. 1. The area of the space can be easily set so that the pressing force of the compressed gas on the thrust bearing can be maintained under any operating pressure conditions, and efficient operation is possible, and it is independent of the area of the space. It becomes possible to optimize the size and shape of the rotation prevention mechanism, and the size of the shunt compressor can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the orbiting scroll and orbiting plate shown in FIG. 1, and FIG. FIG. 5 is a longitudinal sectional view showing the mold compressor, and FIG. 5 is a sectional view taken along the line v-v' in FIG. 4...Fixed scroll, 4a...Fixed, fixed scroll end plate, 4b...Fixed scroll wrap,
6...Autorotation prevention mechanism, 17...Orbiting scroll, 1.a...End plate of rotating scroll, 17b...
・・・・Wrap of orbiting scroll, 18・ ・・Turning plate,
22...Space, 23...Communication path.

Claims (1)

[Claims] two mutually interlocking orbiting scrolls and fixed scrolls having wraps standing upright on end plates; a rotating plate attached to the orbiting scroll and movable only in the height direction of the wrap; and rotation of the orbiting scroll via the rotating plate. A scroll compressor comprising: an anti-rotation mechanism that prevents rotation and performs a rotating motion; a space formed between the back surface of the orbiting scroll on the opposite side of the lap and the orbiting plate; and a communication path that communicates the space with a high pressure section.