JPS63223379A - Scroll displacement type machine - Google Patents

Abstract

PURPOSE:To reduce a sliding loss due to a lap and an end plate in a moment of starting rotation, by interconnecting the space formed by a groove and the lap to be installed in the end plate constituting each of fixed and turning scrolls to a high pressure space or the like in a hermetically sealed vessel. CONSTITUTION:A turning scroll 10 of a scroll displacement type compressor consists of a turning end plate 102 and a turning lap 104, and a fixed scroll 110 also consists of a fixed end plate 112 and a fixed lap 114. Each of these laps 104 and 112 is fitted in the turning groove and the fixed groove 116 installed in these end plates 102 and 112. In this case, spaces 18 and 24 to be partitioned off by these grooves 106 and 116 and laps 104 and 114 installed in these end plates 102 and 112 are interconnected to a vessel space to be formed at the side of a crankshaft 102a of the end plate 102 and a high pressure space 20 to be formed at the opposite fixed lap side of the end plate 112, respectively, by pipes 22 and 26 formed in these end plates 102 and 112.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) This invention relates to scroll displacement machines.

(Prior art) As a conventional scroll displacement machine,
There is a device as shown in Japanese Patent No. 8705, which will be explained using FIGS. 4, 5, and 6.

As shown in FIG. 4, a turning groove 106 is formed in the turning mirror plate 102 in accordance with the shape of the spiral turning wrap 104. As shown in FIG. A turning wrap 104 is inserted into the turning groove 106. An elastic body 108 (shown in FIG. 5) formed of, for example, a leaf spring is inserted between the pivot groove 106 and the pivot wrap 104.

The fixed scroll 110 is also configured in the same manner as the orbiting scroll 100, and as shown in FIG.
A fixing wrap 1114 is inserted into a fixing groove 116 formed in the fixing groove 116, and between the fixing groove 116 and the fixing wrap 114,
An elastic body 108 is inserted.

A fixed end plate 112 of the fixed scroll 110 is fixed to a frame (not shown). The orbiting scroll 100 and the fixed scroll 110 are engaged with each other with the orbiting wrap 104 and the fixed wrap 114 inside. The turning wrap 104 is always in close contact with the fixed mirror plate 112 due to the elastic force of the elastic body 108. The fixed wrap 114 also
Due to the elastic force of the elastic body 108, it is always in close contact with the rotating mirror plate 102. Therefore, considering the case where a scroll displacement machine is used as a compressor, when the orbiting scroll 100 starts the orbiting movement, the closed space 1 shown in FIG.
18 moves to the center while decreasing its volume.

The discharge hole 112a formed in the fixed end plate 112 of the fixed scroll 110 communicates with the discharge hole 112a. Using this action, the refrigerant in the closed space 118 is compressed and discharged from the discharge hole 112a into a high-pressure space (not shown).

The orbiting scroll 100 receives force due to compression of refrigerant gas. Therefore, the rotating head plate 102 and the fixed head plate 112
The distance between them varies. At this time, the turning wrap 104 is always in close contact with the fixed end plate 112 while moving up and down with respect to the turning end plate 102. Similarly, the fixed two tabs 114 are always in close contact with the rotating head plate 102 while moving up and down with respect to the fixed head plate 112. Therefore, closed space 11
The refrigerant gas in 8 flows out of the closed space 118.
A compressor with good operating efficiency can be obtained.

(Problems to be Solved by the Invention) According to this scroll displacement machine, the orbiting scroll 1
From the start of 000 rotations, the turning wrap 104 is fixed end plate 1
12, and the fixed wrap 114 is in close contact with the rotating head plate 102, so a large torque is required because there is an instantaneous sliding loss when the rotation starts.

Therefore, an object of the present invention is to reduce the sliding loss caused by the wrap and end plate at the moment when rotation starts.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve this object, the present invention has the following configuration. That is, the scroll displacement machine according to the present invention has a fixed scroll in which a spiral wrap is inserted into a groove provided in an end plate, and an orbiting scroll in which a spiral wrap is inserted in a groove provided in an end plate, The space formed by the grooves and wraps provided on the end plates of both scrolls communicates with the closed space or high-pressure space formed by both scrolls.

(Function) When the orbiting scroll starts its orbiting motion, for example when compressing gas, the refrigerant gas is sucked into the closed space formed by both scrolls, and the cylinder pressure increases from the time of suction.
Discharged into high pressure space.

The orbiting scroll is subjected to various forces due to the compression of the refrigerant gas (by the main shaft for orbiting movement, etc.). Therefore, the distance between the end plates of both scrolls changes slightly depending on how the force is received. At this time, the space formed by the groove provided on the end plate and the wrap is in communication with a closed space or a high-pressure space, so as this pressure increases, the wrap is pushed up in the direction away from the end plate, and the rotation occurs at a constant pressure. If this is the case, the wrap of the scroll will always be in close contact with the end plate of the fixed scroll, and the wrap of the fixed boss scroll will always be in close contact with the end plate of the orbiting scroll.

(Example) A first example of the present invention will be described with reference to FIGS. 1 and 2. Note that the same parts as in the conventional example are given the same reference numerals.

The first example is an example in which the present invention is applied to a compressor. FIG. 1 shows a vertical cross-section of the compressor.

The orbiting scroll 100 has a cylindrical crank bearing 102a.
The rotating head plate 102 and the turning wrap 104 are inserted into a turning groove 106 (shown in FIG. 2) provided in the turning head plate 102. Similarly, the fixed scroll 110 is also composed of a fixed end plate 112 having a discharge hole 112Jl and two fixed tabs 114,
The fixing wrap 114 is inserted into a fixing groove 116 (shown in FIG. 2) provided in the fixing head plate 112. And both scrolls 100 and 110 have two knobs 104 and 11.
They are interlocked with 4 on the inside.

The frame 2 has a main bearing 2a supporting a main shaft at its center, and a proximal protrusion 2b on the outer periphery of the main bearing 2a. Then, it is press-fitted and fixed inside the airtight container 4. frame 2
A fixed scroll 110 is fixed to the upper surface of the.

The orbiting scroll 100 is supported by the proximal protrusion 2b of the frame 2 and meshes with the fixed scroll 110. An Oldham ring 6 is provided between the orbiting scroll 100 and the frame 2. The Oldham ring 6 has the function of preventing the orbiting scroll 100 from rotating with respect to the frame 2.

The main shaft 8 has a crankshaft portion 81 at its end.

Then, it is inserted into the main bearing 2a of the frame 2 and supported so as to be rotatable. A rotor 10 is located below the main shaft 8.
is press-fitted and fixed. A stator 12 is press-fitted and fixed inside the closed container 4 so as to face the outer periphery of the rotor 1°.

Suction pipe 14 for introducing refrigerant into the closed container 4
is fixed to the closed container 4 and the frame 2, and a discharge pipe 16 for taking out the refrigerant from the closed container 4 is fixed to the closed container 4.

The features of the structure of the first embodiment (shown in FIG. 2) include the turning groove 106 provided in the turning head plate 102 and the turning lap 1.
04 and the rotating mirror plate 1.
The container space 20 formed on the side of the crank bearing 102a of 02 is communicated with a tube 22 formed in the rotating head plate 102, and the fixing groove 116 provided in the fixed head plate 112 and the fixed wrap 11
4, and the fixed end plate 112.
The high-pressure space 20 formed on the side opposite to the fixed two knobs 114 is communicated through a pipe 26 formed in the fixed end plate 112.

Therefore, the operation of the first embodiment will be explained. When the stator 12 is energized, the rotor 10 starts rotating and the orbiting scroll 100 starts an orbiting motion. As a result, refrigerant is sucked from the suction pipe 14, and both scrolls 100 and 11
0, the refrigerant becomes higher pressure than when it is sucked in, and the high pressure space 2 in the closed container 4 is discharged from the discharge hole 112a.
It is discharged to 0. Then, the refrigerant passes through the through hole 30, goes to the lower surface side of the frame 2, and enters the airtight container 4 from the discharge pipe 16.
I go outside.

Before the start of operation, the pressures in the container space 20 and the closed space 118 are approximately uniform. Therefore, the turning lap 104 is the turning groove 1
It is in contact with the lower part of 06. Furthermore, the fixed wrap 114 is in contact with the rotating mirror plate 102 due to its own weight.

However, when the compression action begins, the pressure within the closed space 118 begins to rise and is discharged when the pressure reaches its highest, so the pressure within the container space 20 also begins to rise. The pressures in the container space 20, the swirl groove space 18, and the fixed groove space U are the same. As a result, the pressure on the upper surface of the turning wrap 104 (pressure in the closed space 118)
When the pressure on the lower surface (pressure in the container space 2°) becomes higher and the necessary pressure difference is created, the swirling wrap 104 is lifted upward,
It is pressed against the fixed mirror plate 112. Also turning lap 104
is pressed against the rotating head plate not only by its own weight, but also by the pressure difference.

Therefore, according to this embodiment, the sliding loss caused by the wrap and end plate can be reduced at the moment when rotation starts.

Next, the configuration of the second embodiment will be explained using FIG. 3. Second
In this embodiment, a tube 28 made of an elastic body (for example, rubber) is inserted into the fixed groove space 18 and the rotating groove space 18, and its end portion is communicated with the circumferential pressure space 20.

By adopting such a configuration, it has the same effect and also has the effect of preventing the refrigerant gas in the container space 20 from leaking into the closed space 118 through the gap between the wrap and the groove.

Further, as a third embodiment, there is also a configuration in which the compression chamber side is communicated with the turning groove space 18 and the fixed groove space 18.

With such a configuration, the pressures in the swirling groove space 18 and the fixed groove space can be set freely, and the force for pressing the swirling wrap 104 and the fixed wrap 114 can be freely set.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a scroll displacement type machine that has the effect of reducing sliding loss due to the wrap and end plate at the moment when rotation starts.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention, in which FIG. 1 is a vertical sectional view of a compressor, FIG. 2 is a sectional view of essential parts of the first embodiment, and FIG. FIG. 3 is a sectional view of a main part of an example. FIG. 4 is a perspective view of an orbiting scroll, FIG. 5 is a sectional view of a main part of a conventional embodiment, and FIG. 6 is a horizontal sectional view of a wrap. 100... Orbiting scroll 102... Orbiting mirror plate 104... Orbiting wrap 106... Orbiting groove 11
0...Fixed flow/I/112...Fixed end plate 11
4...Fixed wrap 116...Fixed groove agent
Patent Attorney Nori Chika Ken Yudo Yukio Yuyama 1st figure 1 pressure j accommodation set Figure 4: 1st L of the Lost Scroll

Claims (1)

[Claims] A fixed scroll in which a spiral wrap is inserted into a groove provided on the end plate, and an orbiting scroll in which a spiral wrap is inserted in a groove provided in the end plate are engaged with each other with their wraps facing each other. In a device in which the orbiting scroll makes an orbital motion without apparently rotating on its own axis, and transfers fluid, compresses or expands gas, the space formed by the groove and the wrap provided on the end plate and the space formed by both scrolls. A scroll displacement machine characterized by communicating with a closed space or a high pressure space.