JPH04203486A - scroll type fluid machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a scroll-type fluid machine used for a compressor, a vacuum pump, etc., and particularly relates to measures for stopping a rotation prevention mechanism.

(Prior art) Generally, scroll type fluid machines are
As disclosed in Japanese Patent No. 87, a fixed scroll and an orbiting scroll are housed in a casing, and both scrolls each have a spiral wrap formed protruding from the front surface of an end plate. The two wraps face each other and engage with each other so that a working chamber is formed between the side surfaces of the two wraps. Further, in the orbiting scroll, a crankshaft of a rotary shaft is connected to the back surface of the end plate eccentrically from the axis, and is supported by the casing on the back surface of the end plate. When the crankshaft is rotated, the orbiting scroll is prevented from rotating by the rotation prevention l-mechanism, and only revolves around the fixed scroll, and low-pressure fluid flows into the working chamber from the side of the wrap, causing the working chamber to contract. The fluid is compressed and discharged from the central discharge port of the fixed scroll.

In the scroll type fluid device, the rotation prevention mechanism includes:
It consists of a large-diameter crank body that engages with the casing, and a small-diameter crank pin that is eccentric from the crank body and engages with the end plate of the orbiting scroll, and prevents the orbiting scroll from rotating on its axis.

(Problems to be Solved by the Invention) In the scroll-type fluid machine described above, as shown in FIG. If the eccentric direction of the crank bin e is located on the same straight line A when the orbiting scroll is stopped, that is, if the crank bin e is located at the point of interest, the crank bin e will move in both directions C with respect to the rotation direction B of the rotating shaft. , D can be rotated, but there was a problem that it could not be started.

Therefore, conventionally, as shown in FIG.
, d are provided to ensure smooth startup.

However, since two rotation prevention mechanisms d are provided, there is a problem in that vibration and noise are large. That is, since high precision is required for the dimensions of the crankshaft C and the crank bin e, as the number increases, dimensional errors accumulate and internal stress is generated. This results in increased vibration and noise.

In addition, there are many parts, especially precision parts such as the high-precision crank bin e mentioned above, which requires time and effort to process.
The problem was that it was expensive.

The present invention has been made in view of these points, and aims to enable smooth startup with a single rotation prevention mechanism, reduce vibration and noise, and reduce the number of parts. It is.

(First Step to Solve the Problems) In order to achieve the above object, the means adopted in the present invention is to use magnetic force means to prevent the crank from suddenly stopping.

Specifically, the means taken by the invention according to claim (1) first includes a fixed scroll that is fixed to the casing with a spiral wrap erected on the front surface of the end plate, and a spiral wrap on the front surface of the end plate. There is also an orbiting scroll which is housed in a casing with its wrap engaged with the wrap of the fixed scroll. It has a main shaft and a crankshaft eccentric from the axis of the main shaft, and either the crankshaft or a rotating shaft is connected to the back surface of the end plate of the orbiting scroll. The apparatus further includes a crank body provided on a fixed member that is stationary when the orbiting scroll rotates, and a crank bin that is eccentric from the center of the crank body and engaged with an end plate of the orbiting scroll, and the crank bin is eccentric from the center of the crank body and engaged with an end plate of the orbiting scroll. A rotation prevention mechanism is provided to prevent rotation.

In addition, a movable member is provided between the fixed member and a movable member that moves when the orbiting scroll rotates, so that when the orbiting scroll stops, the movable member stops at a position different from the original position. The structure is equipped with magnetic force means to stop the shrine.

(Operation) With the above configuration, in the invention according to claim (1), when the rotating shaft connected to the orbiting scroll is rotated, the orbiting scroll does not rotate relative to the fixed scroll but only revolves due to the rotation prevention mechanism. Let's do it. Then, as the orbiting scroll revolves, a working chamber is formed between the laps of both scrolls, and the working chamber, for example, moves spirally toward the center and its volume contracts, compressing the fluid and fixing it. Discharge from the center of the scroll.

When this drive is stopped, the crank bin may try to stop at the desired point, but the magnetic force means stops the crank bin at a position away from the desired point.

For example, a permanent magnet provided on the rotating shaft and the casing causes the crank bin to stop at a position different from the intended point.

This will ensure that the next startup will be performed smoothly.

(Effect of the Invention) Therefore, according to the invention according to claim (1), since the crank pin is provided with the magnetic force means to stop at a position different from the considered point, smooth startup is ensured by one rotation prevention mechanism. can be done.

In addition, since only one rotation prevention mechanism is provided, it is easier to manage the dimensions of the crankshaft and crank pin, reducing the accumulation of dimensional errors, reducing internal stress, and significantly reducing vibration and noise. I can do it.

In addition, the number of precision parts such as high-precision crank pins can be reduced, and the number of parts can be reduced, processing and assembly can be facilitated, and the cost can be reduced.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIG. 1, 1 is a scroll-type fluid machine used for compressors, vacuum pumps, etc.

The scroll type fluid machine 1 includes a drive mechanism 11 and a scroll mechanism 12 attached to a casing 2,
The casing 2 is formed by attaching a motor housing part 22 to one side (lower side in FIG. 1) of a main body part 21 formed in a substantially disk shape.

The drive mechanism 11 is constructed by fitting the rotary shaft 3 into a motor lla housed in a motor housing 22. The rotating shaft 3 is formed by a crankshaft 32 at the upper end of the main shaft 31 and protruding eccentrically in the radial direction from the axis of the main shaft 31. , a lower end portion is rotatably fitted into the bottom plate of the motor housing portion 22 via a bearing 34 and supported by the casing 2 . Furthermore, a substantially semicircular main balance weight 35 is provided at the upper end of the main shaft 31, and a sub-balance weight 36 is provided at the lower end. This is done to offset the imbalance caused by force.

A stepped portion 23 is formed on one side (upper side in FIG. 1) of the casing main body portion 21, and the main balance weight 35 is configured to rotate within the stepped portion 23. Furthermore, a shaft hole 24 is formed in the center of the main body 21 so as to penetrate both upper and lower surfaces thereof, and the main shaft 31 of the rotating shaft 3 is inserted into the shaft hole 24 through the main bearing 33. Supported.

The scroll mechanism 12 includes a fixed scroll 4 and an orbiting scroll 5, both scrolls 4.5 and 5.
are formed by integrally erecting a spiral (involute curved) wrap 42,52 on the front surface of a disk-shaped end plate 41,51. The scrolls 4 and 5 are vertically arranged side by side with the front surfaces of the mirror plates 41.51 facing each other, and the wraps 42.52 are engaged with each other.

Further, the end plate 41 of the fixed scroll 4 also serves as the lid of the casing 2, and a flange 43 is provided on the outer peripheral edge.
The flange 743 extends downward so as to cover the sides of the orbiting scroll 5, and is fixed to the outer peripheral edge of the side surface of the casing main body 21. Further, a suction port 44 communicating with the outside of both wraps 42 and 52 is provided in the flange 43 of the fixed scroll 4, and a discharge port 45 is provided in the center of the end plate 4, respectively.

On the other hand, in the above-mentioned orbiting scroll 5, the outer peripheral edge of the lower surface of the mirror 51 is installed on the stepped portion 23 of the casing main body 21 via the upper sliding member 53 and the lower sliding member 54. Supported. Furthermore, a bottle hole 55 is formed on the back surface of the end plate 51 of the orbiting scroll 5, and the crankshaft 32 of the rotating shaft 3 is inserted into the bottle hole 55.
are fitted through an orbiting bearing 56, and the orbiting scroll 5 is configured to rotate eccentrically from the axis of the main shaft 31 of the rotary shaft 3.

In addition, the end plates 41 and 51 in both the scrolls 4 and 5 are
One rotation prevention mechanism 6 of the orbiting scroll 5 is provided between the outer peripheral edges of the orbiting scroll 5 . The rotation prevention mechanism 6 includes a first crank pin 61 and a second crank pin 62 that are set to have the same eccentricity as the eccentricity between the main shaft 31 and the crankshaft 32 of the rotating shaft 3.
are configured to protrude from both sides of the substrate 63. Furthermore,
The first crank pin 61 is fitted via a bearing 64 to the casing body 21, which is a fixed member that is stationary when the orbiting scroll 5 rotates, while the second crank pin 62 is fitted to the end plate of the orbiting scroll 5. Bearing 6 on the outer periphery of 51
It is fitted through 5.

A crank body is formed by this board 63 and the first crank bin 61, and this rotation prevention mechanism 6
As a result, the orbiting scroll 5 only revolves around the fixed scroll 4 without rotating with the rotation of the rotary shaft 3, and both wraps 41.51 maintain a small gap on the sides in the eccentric direction, and both wraps 42. In between, the working chamber 13 is formed from the end of the outer circumferential winding of the wrap 42.degree. 52, and is configured to contract in volume while moving spirally toward the center.

Next, the magnetic force means 7, which is a feature of the present invention, will be explained.

As shown in FIG. 2, the magnetic force means 7 is composed of one first permanent magnet 71 and two second permanent magnets 72, 72. The first permanent magnet 71 is attached to the center of the outer peripheral surface of the main balance weight 35, which is a movable member that moves when the orbiting scroll 5 rotates, while the second permanent magnets 72 and 72 are attached to the casing main body, which is a fixed member. They are attached to the circumferential surface of the stepped portion 23 of 21 at opposing positions with an interval of 180° between them. That is, in a state where the eccentric direction of the crankshaft 32 and the eccentric direction of the second crank bin 62 are on the same straight line A, the three permanent magnets 71 and 72 are arranged on the straight line A. The opposing surfaces of the first permanent magnet 71 and the second permanent magnet 72 are set to have the same polarity to prevent the second crank pin 62 from stopping at the point of interest (the state shown in FIG. 2).

Next, the operation of this scroll type fluid machine 1 will be explained.

First, low-pressure fluid is introduced from the suction port 44 to the outside of both wraps 42° 52, and on the other hand, the rotating shaft 3 is rotated by the drive of the motor 11a, and the crankshaft 32, which is eccentric from the axis of the rotating shaft 3, is rotated. The rotation rotates with respect to the orbiting scroll 5 or the revolving scroll 4. The orbiting scroll 5 is prevented from rotating by the rotation prevention mechanism 6, and revolves around the axis of the rotating shaft 3. Due to this revolution, the working chamber 13 is moved between the laps 42 and 52 of both scrolls 4. are sequentially formed, and the working chamber 13 is connected to the central discharge port 45.
The low pressure fluid is compressed within the working chamber 13 and is discharged from the discharge port 45 as it moves spirally toward .

When this drive is stopped, the eccentric directions of the crankshaft 32 and the second crank bin 62 may tend to be located on the same straight line A. At that time, the first permanent magnet 71 and the second permanent magnet 72 face each other, and since their opposing surfaces are set to have the same polarity, they repel each other, causing the main balance weight 35 to rotate. do. As a result, the eccentric direction of the crankshaft 32 and the second crank bin 62 will deviate from the straight line A, and the second crank bin 62 will not come to a sudden stop.

Therefore, since the magnetic force means 7 for stopping the second crank pin 62 at a position different from the intended point is provided, smooth starting can be ensured with one rotation arrester IM6.

In addition, since only one rotation prevention device H46 is provided, it becomes easier to manage the dimensions of the crankshaft 32 and the second crank bin 62, and the accumulation of dimensional errors is reduced, which reduces internal stress and reduces vibration. and noise can be significantly reduced.

Further, the number of precision parts such as the second crank bin 62 with high precision can be reduced, the number of parts can be reduced, processing and assembly can be made easier, and the cost can be reduced.

FIG. 3 shows another magnetic force means 7a. The magnetic force means 7
In the example a, instead of the magnetic force means 7 of the above embodiment which utilized the repulsive force of the magnetic force, it utilizes the attractive force of the magnetic force.

That is, while the main balance eight 35 is formed of a magnetic column, two permanent magnets 73 and 73 are provided in the stepped portion 23 of the caning main body portion 21. The permanent magnets 73, 73 are formed wide, and are attached to the crankshaft 32.
and the second crank bin 62 are provided at opposing positions outside of the straight line A in the eccentric direction.

Therefore, when the second crank pin 62 attempts to stop on the straight line A, the permanent magnet 73 attracts the main balance eight 35, the main balance eight 35 rotates, and the second crank pin 62 Never stop at a point of thought.

Other configurations, functions, and effects are the same as in the previous embodiment.

In addition, regarding the third factor, a permanent magnet may be provided in the main balance eight 35 and the attractive force of the magnetic force may be utilized.

Furthermore, the rotation prevention mechanism 6 may be provided between the mirror plates 41 and 51, and the base plate 63 and the first crank pin 61 may be formed to have the same diameter.

Further, the magnetic force means 7 and 7a are connected to the end plate 51 of the orbiting scroll 5.
and the casing 2.

Furthermore, electromagnets may be used in place of the permanent magnets 72 and 73.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a scroll type fluid machine, and FIG. 2 is a sectional view taken along line XX in FIG. 1. FIG. 3 is a diagram corresponding to FIG. 2 showing another magnetic force means. FIGS. 4 and 5 show conventional examples, and are equivalent to FIG. 2, respectively. 1...Scroll type fluid machine 2...Casing 3...Rotating shaft 4...Fixed scroll 5...Orbiting scroll 6...Rotation prevention mechanism 21...Body part 32...Crankshaft 41.51... End plate 42, 52... Wrap 7.7a... Magnetic means 61.62... Crank pin 71.72.73... Permanent magnet and 1 other person 2111 Figure 4 Figure 3 Figure 5

Claims (1)

[Claims] (1) A fixed scroll with a spiral wrap erected on the front of the end plate and fixed to the casing, and a spiral wrap erected on the front of the end plate, which is engaged with the wrap of the fixed scroll. an orbiting scroll housed in a casing; a main shaft; and a crankshaft eccentric from the axis of the main shaft;
The crankshaft includes a rotating shaft connected to the back surface of the end plate of the orbiting scroll, a crank body provided on a fixed member that is stationary when the orbiting scroll rotates, and a crank body that is eccentric from the center of the crank body and attached to the end plate of the orbiting scroll. one rotation prevention mechanism that has an engaged crank pin and prevents rotation of the orbiting scroll; and a movable member that is movable when the orbiting scroll rotates and the fixed member, and is provided between the fixed member and a movable member that moves when the orbiting scroll is stopped; A scroll-type fluid machine characterized by comprising magnetic force means for stopping a movable member so that the crank pin stops at a position different from the intended point.