JPH02245486A - Scroll fluid machine - Google Patents

Abstract

PURPOSE:To make reliable operation of a machine even under oil-less condition by separating, from each other, the rotary shafts of suction side and delivery side scroll members with spiral laps by the same distance as the turning radius of the laps and turning them synchronously by a power transmitting means. CONSTITUTION:The rotation of a shaft 4 driven by a motor, etc. is transmitted simultaneously to a suction side scroll 1 and a delivery side scroll 7 through pulleys 3 and 5 and timing belts 2 and 6. The axes of the two scrolls are separated from each other by the same distance as the turning radius of a scroll lap, and the two scrolls are rotated synchronously to perform compressive actions. A synchronized operation is made possible by setting at specified values N ratios of the suction side and delivery side scroll pulleys 31 and 32 to the pulleys 3 and 5, respectively. Air is taken in through a suction filter 24, compressed in the scroll laps of the scrolls 1 and 7 meshed with each other through a connecting hole 21, and delivered from a connecting hole 22. Thus, no rotation prevention mechanism is required and reliable oil-less operation can be performed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a scroll fluid machine, which is used as, for example, a gas compressor, a blower, a vacuum pump, etc., and which is particularly suitable for operating without oil supply. It's about machines.

[Conventional technology]

Conventionally, various means have been tried as a drive device for a scroll fluid machine, and some of them have had problems with driving in an oil-free state.

For example, Japanese Unexamined Patent Publication No. 55-96390 discloses a technique in which two scrolls are driven by two electric motors at the same time.

Further, Japanese Patent Application Laid-Open No. 58-30401 discloses a technique for driving one scroll member via a pin crank under oil lubrication.

Further, JP-A-55-148994 discloses a technique for driving one scroll member using an Oldham ring, and JP-A-59-110885 discloses a technique for driving a pair of scroll members in the same direction. A technology has been disclosed in which the robot is rotated to perform revolution and oscillation operation using the action of a guide ring and a pin disk.

[Problem to be solved by the invention]

In the above conventional technology, problems such as lubrication become a bottleneck.
When using a mechanism that controls the scroll's "wrinkle-like motion," especially an Oldham ring, care must be taken in lubrication, and consideration must be given to the fact that using it without lubrication may cause wear or galling of the sliding parts. It had not been done.

Furthermore, the technique described in Japanese Patent Application Laid-Open No. 55-96390 has a problem in that it is technically difficult to drive two motors in synchronization.

In addition, for example, the technology described in Japanese Utility Model Application Publication No. 59-96389 connects one scroll member directly with power, transmits rotation from the driving state of the scroll member via a power transmission mechanism, and guides the rotation of the other scroll member. However, when there is a lot of mechanical loss in the power transmission mechanism or there is so-called "backlash", the number of rotations to be transmitted fluctuates and is difficult to maintain at the same level, resulting in instability. There is.

Others: JP-A-55-148994 and JP-A-58-
The technique described in Publication No. 30401 requires the use of lubricating oil and is difficult to use without lubrication.

The same can be said of the technique described in Japanese Unexamined Patent Publication No. 59-110885, and furthermore, it is always accompanied by difficulties in manufacturing. Because of these problems, each of the above technologies
It can be pointed out that it cannot withstand use without lubrication.

The present invention has been made to solve the problems in the prior art described above, and eliminates the need for a mechanism to prevent rotation of the scroll member, and employs a synchronous rotation drive mechanism for both the scroll members on the suction side and the discharge side, thereby eliminating the need for lubrication. The object of the present invention is to provide an oil-free scroll fluid machine that can operate inexpensively and reliably even under low pressure conditions.

[Means to solve the problem]

In order to achieve the above object, a scroll fluid machine according to the present invention has a scroll type fluid machine in which a compression chamber is formed by meshing suction side and discharge side scroll members having spiral wraps with each other. The scroll members on the suction side and the discharge side have their respective rotation axes spaced apart from each other by the same distance as the turning radius of the spiral wrap, and are provided with a rotation shaft serving as a drive side, from which the rotation axis Power transmission means for transmitting synchronous rotation to the scroll members on the suction side and the discharge side are respectively provided.

It should be noted that the present invention is a new mechanism developed in contrast to conventional fixed and revolving surface scroll mechanisms.

In other words, a scroll that rotates around the axis is installed,
By rotating a pair of scroll wraps at the same rotational speed while adjusting only the shaft center to the radial displacement within the scroll wraps, scroll fluid machines can compress, expand, feed, and move fluid. conduct.

For this reason, scroll fluid machines are capable of compressing and expanding fluid by performing synchronized rotation from shafts that are rotationally driven by power using means such as sprockets and chains that transmit rotational behavior accurately and reliably. , transport, and move, and the objective is achieved.

In addition, as a means of accurately and reliably transmitting rotational behavior,
For example, by using a timing belt, it is easy to use without oil, reduces noise, and prevents the transmission mechanism from expanding or contracting due to the effects of heat or material deterioration. Less impact. Even when the timing belt is affected by heat and elongates, the two timing belts tend to elongate equally during the stroke that is transmitted to both the suction side and the discharge side scroll members, as the timing belt deforms. Any loss of synchronization is offset by the inherent autonomy of the mechanism.

Furthermore, by interposing an elastic body between one end of the scroll member and the frame, for example, it is possible to simplify assembly work, and also absorb dimensional changes caused by thermal expansion of the scroll member itself, thereby stabilizing performance. It will contribute to

[Effect]

The basic working of the above technical means is as follows.

The scroll members on the suction side and the discharge side are rotationally driven from the same shaft related to the rotation axis on the drive side via power transmission means synchronized with each other. At this time, a compression chamber is formed by separating the rotational axes of both scroll members by the same distance as the turning radius of the scroll wrap, and the compression action is continuously repeated.

At this time, the WJ scroll material performs its synchronous operation via a power transmission means, and does not involve a mechanism that controls rotation such as an Oldham ring or a bottle, so it can be driven with high reliability even without lubrication. be exposed.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

First, FIG. 1 is a longitudinal sectional view of a scroll type gas compressor according to an embodiment of the present invention.

In FIG. 1, 1 is a suction side scroll related to a suction side scroll member, 2 is a timing belt, 3 is a pulley for transmitting power to the suction side scroll pulley section 31 via the timing belt 2, and 4 is a pulley for transmitting power to the suction side scroll pulley section 31 via the timing belt 2. , a shaft related to the rotating shaft on the drive side and to which the pulley 3 is fitted; 5 is a pulley for transmitting power to the discharge side scroll pulley section 32 via the timing belt 6; 7 is a scroll member on the discharge side. This is a discharge side scroll according to the present invention.

8.9.10 is a frame that houses the mechanical elements mentioned above. 11 is an elastic body interposed between the frame 8 and the discharge scroll 7; 12 is an elastic body installed between the discharge scroll 7 and the frame 8 for the rotational behavior of the discharge scroll 7; thrust bearing, 1
3 is a thrust bearing installed between the suction side scroll 1 and the frame 9 for the rotational behavior of the suction side scroll 1, and 33 is a thrust bearing installed between the inner diameter part of the suction side scroll and the frame for the rotational behavior of the suction side scroll 1. 9 is a bearing installed between the inner diameter part of the discharge side scroll 7 and the support boss part of the frame 8, and 34 is a bearing installed between the inner diameter part of the discharge side scroll 7 and the support boss part of the frame 8 for the rotational behavior of the discharge side scroll 7.
21 is a communication hole that connects the suction port of the suction side scroll 1 and the compression chamber (inside the scroll wrap), 22 is a communication hole that connects the discharge port of the discharge side scroll 7 and the compression chamber, and 24 is a communication hole that connects the suction port of the suction side scroll 1 and the compression chamber (inside the scroll wrap). This is a suction filter installed at the suction port.

The operation of the scroll type gas compressor shown in FIG. 1 will be explained.

The rotational movement of the shaft 4 driven by a motor or similar prime mover (not shown) is transmitted to the suction side scroll 1 through the pulley 3 and the timing belt 2 to perform rotational movement, and at the same time, the rotational movement of the shaft 4 is from shaft 4 to pulley 5. It is transmitted to the discharge side scroll 7 via the timing belt 6. At this time, the compression operation is performed by separating the axes of the two scrolls by the same distance as the turning radius of the scroll wrap and performing synchronous rotation.

The suction side scroll 1 and the discharge side scroll 7 must be synchronized and rotate at the same time.

Now, of the suction side scroll 1, the timing belt 2
Xai is the diameter of the suction side scroll pulley part 31 on which
Let the diameter of boo IJ3 be xa.

Similarly, in the discharge scroll 7, the diameter of the discharge scroll pulley portion 32 on which the timing belt 6 is applied is 18 mm.
2, and the diameter of the pulley 5 is xa.

At this time, by setting the relationship between the values of these four terms as follows: xaz, X8:X82:XI5, synchronous operation that maintains the same rotation form is possible. Naturally, the suction side scroll pulley portion 31. The timing belts 2 and 6 are attached to the discharge side scroll pulley section 32.
Requires machining of the abutment surface required for winding.

In order to suppress the suction side scroll 1 and the discharge side scroll 7, an elastic body 11 is interposed between the thrust bearing 12 and the frame 8 to improve performance.

This helps improve ease of assembly.

Thereby, the suction side scrolls 1 and 2 take in gas from the suction filter 24 and engage with each other through the communication holes 21.
The compressed gas is taken into the scroll wrap of the discharge side scroll 7 and compressed, and the compressed gas is discharged through the communication hole 22.

The scroll type gas compressor shown in Fig. 1 has fewer mechanical elements than known scroll compressors and is mechanically simple, making it possible to use general-purpose parts and making it economical. Good sex.

In addition, since Oldham rings, etc. are not used, oil lubrication is not required and the amount of oil contamination is reduced, so the gas is compressed, expanded, oil-fed, and moved without containing oil, resulting in the ability to supply clean gas. be.

In addition, by synchronizing the rotation of the shaft from the same prime mover, each scroll on the suction side and discharge side always maintains the same rotational speed regardless of the rise of the drive power, so the two electric motors are coordinated. Compared to driving examples (for example, Japanese Patent Laid-Open No. 55-96390, etc.), there is no difficulty in strictly synchronizing the electric motors, and the difficulty of control is freed.

Furthermore, even if the transmission device is deformed due to wear, stress, temperature rise, etc., the autonomous mechanism of this embodiment tends to offset the synchronization difference, resulting in economic efficiency and durability. It is also effective in terms of the reliability of the mechanism.

In addition, by employing a timing belt as the power transmission means, noise can be reduced.

Next, FIG. 2 is a vertical sectional view of a scroll type vacuum pump according to another embodiment of the present invention.

Components with the same reference numerals as those in FIG. 1 are equivalent parts, so a description thereof will be omitted.

In Fig. 2, IA is the suction side scroll.

21A is a communication hole formed at the end of the scroll wrap of the suction side scroll IA, 23 is a ventilation hole drilled in the frame 9A, and 35.36 is a shaft seal provided in the support part of the frame 10 and the shaft 4. It is a member.

Gas from the outside is taken into the frame 9A through the ventilation hole 23, and then taken into the scroll wrap through the communication hole 21A provided in a part of the suction side scroll IA, compressed, and passed through the communication hole 22. The release of compressed gas takes place. According to this embodiment, in addition to the same effects as the embodiment shown in FIG. There is an effect.

In addition, in each of the above embodiments, an example was explained in which a timing belt was used as a power transmission means for transmitting synchronous rotation to the scroll members on the suction side and the discharge side, respectively, but the present invention is not limited to this. do not have.

For example, the suction side scroll boob portion 31 in FIGS. 1 and 2. It is also possible to replace the discharge side scroll pulley part 32 with sprocket-shaped teeth, replace the pulleys 3 and 4 with sprocket foils, and replace the timing belt 2.6 with a chain. can be set using the same formula as above. Of course, when a chain is used, a chain tensioner should also be installed.

〔Effect of the invention〕

As described above, according to the present invention, by eliminating the need for a mechanism to prevent the rotation of the scroll member and adopting a synchronous rotation drive mechanism for both the scroll members on the suction side and the discharge side, the present invention is inexpensive and reliable even in the absence of lubrication. It is possible to provide an oil-free scroll fluid machine that allows certain operations.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a scroll-type gas compressor according to one embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of a scroll-type vacuum pump according to another embodiment of the present invention. 1. IA... Suction side scroll, 2, 6... Timing belt, 3, 5... Pulley, 4 river shaft, 7.
...Discharge side scroll, 11...Elastic body, 21, 22
...Communication hole, 21A...Communication hole, 23...Vent hole, 31...Suction side scroll pulley part, 32...Discharge side scroll pulley part.

Claims (1)

[Claims] 1. In a scroll type fluid machine in which a compression chamber is formed by mutually meshing suction side and discharge side scroll members having spiral wraps, the suction side and discharge side scroll members have their respective rotation axes aligned with the above-mentioned axis. A power transmission means that is spaced apart from each other by the same distance as the turning radius of the spiral wrap, and has a rotating shaft serving as a drive side, and transmits synchronous rotation from the rotating shaft to the scroll members on the suction side and the discharge side, respectively. A scroll type fluid machine characterized by being provided with.