JPH02140482A - Scroll body fluid device - Google Patents

Abstract

PURPOSE:To abolish the use of a supporting plate so as to facilitate processing and adjustment by forming the title device of a first scroll body performing circular motion by a main spindle and a second fixed scroll body and providing the first scroll body with a cylinder part, which performs circular motion synchronously with the main spindle, on the other end side to the main spindle. CONSTITUTION:A first movable scroll body 20 comprises a main spindle inserting part 20a and a scroll part 20b at the one end and a cylinder part 20c at the other end. The first scroll body 20 performs circular motion by a main spindle 23 and an eccentric member 24a as well as by an axis member 26 and an eccentric member 27a, and a fluid pocket 31 is formed between the first scroll body 20 and a second scroll body 22 fixed in a casing 21. The movable scroll body 20 is supported by bearings at its one end and its other end so as to perform stable circular motion. Moreover, an existing supporting plate becomes unnecessary, resulting in a compact structure, enabling the processing method other than end mill and facilitating assembly. Clearance adjustment in the axial direction is further made easier as well as sealing performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a thinly wound fluid device, and more particularly to a wax-wound fluid device used in a blower for a supercharger at a low pressure level, for example.

(Prior Art) Conventionally, the one shown in FIG. 5 is known as this type of spiral fluid device.

Referring to FIG. 5, a conventional spiral fluid device will be outlined.

A main shaft 2 is rotatably supported by the casing 1 .

An eccentric part 3 is formed on the main shaft 2 eccentrically to the shaft center.
A support plate (bottom plate) 5 that extends in the radial direction is attached to the eccentric portion 3 via a bearing 4. Spiral bodies 6a and 6b are integrally formed on both sides of the support plate 5, respectively. On the other hand, casing 1
As shown in the figure, there is a spiral body 7 extending in the axial direction on the inner wall surface of the
a and 7b are formed, and the spiral bodies 7a and 7b engage with the spiral bodies 6a and 6b to form a closed space (fluid pocket) 11. Spiral body 6a
A sealing member 6c is disposed at the tip of each of the sealing members 6c and 6b, and is in contact with the inner wall surface of the casing 1. Similarly, sealing members are provided at the tips of the spiral bodies 7a and 7b, and are in contact with the support plate 5.

A shaft member 8 is connected to an end of the support body 5 via a bearing 8a, this shaft member 8 is eccentrically connected to a shaft member 9, and this shaft member 9 is rotatably supported by the casing 1. ing. These shaft members 8 and 9 constitute a rotation prevention mechanism for the support plate 5, that is, the thinly wound bodies 6a and 6b.

In the above configuration, when the main shaft 2 is rotated, the eccentric portion 3
performs an eccentric movement. On the other hand, the rotation of the support plate 5 is prevented by the rotation prevention mechanism, and the support plate 5 moves in a circular orbit. As a result, the fluid pocket formed by the spiral bodies 6a and 6b and the spiral bodies 7a and 7b moves toward the center,
Air or the like taken into the fluid pocket from the suction chamber (not shown) is discharged into the discharge chamber 10.

(Issue 8 to be solved by the invention) However, in the case of the above-mentioned conventional fluid device, the main shaft 2
Due to the rotational movement of the spiral bodies 6a and 6 on the movable side,
There was a drawback that stability was poor when b moved in a circular orbit.

Further, the support plate 5 is required to rotate the spiral bodies 6a and 6b, and therefore the support plate 5 must be formed integrally with the spiral bodies 6a and 6b on both sides.

Therefore, conventionally, when forming the spirally wound bodies 6a and 6b with high precision, it was necessary to use an end mill, and there was no other optimal processing method.

Furthermore, as mentioned above, there is a difference in the spiral heights of the two spiral bodies 6a, 6b, 7a, and 7b due to problems in processing accuracy, which causes the problem that the axial clearance does not reach an appropriate value.

Furthermore, in the case of a conventional fluid device, a support plate is required, which increases the size of the fluid device.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, it is a technical object of the present invention to provide a spiral-wound fluid device in which stable movement can be ensured even when the movable spiral-wound moves in a circular orbit.

Further, it is an object of the present invention to provide a spiral-wound body fluid device in which the rotation of a movable spiral-wound body can be prevented without using a plate body, and the plate body can be disposed so that one processing and assembly can be completed and the clearance as set can be obtained. be.

(Means for Solving the Problems) According to the present invention, there is provided a main shaft, a first spiral body that moves in a circular orbit by rotation of the main shaft, and a fixed second spiral body that meshes with the first spiral body. and move toward the center of a sealed space formed by the first spiral body and the second spiral body to discharge fluid, and the first spiral body is arranged such that the main shaft is inserted into the first spiral body. an insertion hole portion, a thinly wound portion having one end connected to the insertion portion and having the insertion portion as the center, and at least one cylindrical portion formed on the other end side of the spiral portion; The spiral-wound fluid device is characterized in that an auxiliary shaft member is inserted so as to perform circular orbital motion in synchronization with the circular orbital motion performed by the rotation of the main shaft.

Further, according to the present invention, the second spiral body is integrally formed with a casing that is open at both ends, and the first spiral body is inserted into the casing, and the first spiral body is inserted into the casing.
There is obtained a spiral-wound fluid device characterized in that the spiral-wound body and the second spiral-wound body are engaged with each other to close both ends of the casing.

(Function) In the present invention, the first spiral body is formed with an insertion hole into which the main shaft is inserted, the main shaft is inserted into the insertion hole, and the main shaft and the first spiral body are connected. Ru. A second spiral body is integrally formed with a casing whose both ends are open, and the first spiral body is inserted into the casing from the open end, and the first spiral body and the second spiral body are engaged. Then, the openings at both ends of the casing are closed, and the main shaft is rotatably supported by the casing.

In the present invention, since a support plate for the thinly wound body is not provided, the thinly wound body can also be processed by punching or extrusion. Furthermore, when machining with high precision, machining methods other than end mill machining can be selected.

Furthermore, since there are two members that influence the axial clearance, the movable side and the stationary side thinly wound body, the clearance can be easily set. Furthermore, since no support plate is provided, the fluid device becomes compact.

(Example) The present invention will be explained below with reference to Examples.

First, with reference to FIGS. 1 and 2, the movable spiral body (
As shown in FIG. 1, the first spiral body 20 includes an insertion portion 20a into which the main shaft is inserted, a spiral portion 20b1 that is integrated with one end connected to this insertion portion 20a, and the other end of this spiral portion 20b. It is provided with a cylindrical portion 20c formed in a cylindrical portion 20c. The movable spiral body 20 is manufactured by conventional punching or extrusion molding.

On the other hand, as shown in FIG. 2, one end of a fixed spiral body (second spiral body) 22 is connected to the inner wall surface of the casing 21, which is open at both ends.
2 is integrated with the casing 21. A space is formed within the casing 21 in which a movable spiral body 20 can make a turning movement, which will be described later.

The casing 21 and fixed spiral body 22 are manufactured by conventional punching or extrusion.

Referring also to FIG. 3, eccentric members 24a and 24b are integrally attached to the main shaft 23 eccentrically with respect to the main shaft center. A bearing member 2 is provided in the insertion portion 20a of the movable spiral body 20.
5a and 25b are press-fitted, and eccentric members 24a and 24b are press-fitted into these bearing members 25a and 25b, thereby holding the main shaft 23 in the insertion portion 20a.

Similarly, the shaft member 26 has an eccentric member 2 which is eccentric to the shaft center.
7a and 27b are integrally attached. Bearing members 28a and 28b are press-fitted into the cylindrical portion 20c of the movable spiral body 20.
Eccentric members 27a and 27b are press-fitted into 8b, and the shaft member 26 is held in the cylindrical portion 20c.

The other end opening of the casing 21 is closed by a second closing plate 32 . At this time, the other ends of the main shaft 23 and the shaft member 26 are rotatably supported by the second closing plate 32 by bearing members 32a and 32b, respectively. Note that two tip seals of the spiral portion 20b are in contact with one surface of the second closing plate 32.

One end of the main shaft 23 is connected to the first shaft by a bearing 30a.
Similarly, the shaft member 26 is rotatably supported by the first closing plate 30 through a bearing 30b.

At this time, the tip seal 29 provided at the tip (both ends) of the spiral portion 20b of the movable spiral body 20 is in contact with one surface of the first closing plate 30.

The movable spiral body 20 is inserted through the opening at one end of the casing 21, and the first closing plate 30 is closely fixed to one end of the casing 21. At this time, the spiral part 20b of the movable spiral body 20 and the fixed spiral body are separated from each other in FIGS.
They engage as shown in b), and a sealed space 31 is formed.

The main shaft 23 and the shaft member 26 are respectively provided with counterweights 23a and 26a near both ends thereof. A drive pulley 33 and a pulley 34 are attached to the other end of the main shaft 23. This pulley 34 is connected via a timing belt 35 to a pulley 36 attached to the other end of the shaft member 26. Therefore, the main shaft 23 and the shaft member 26 rotate synchronously.

On the other hand, a discharge chamber member 37 in which a discharge bow 37a is formed is attached to the other end (left side in FIG. 3) of the first closing plate 30.

The operation of the above-described spiral fluid system will now be described with reference to FIGS. 3 and 4.

When rotational force is applied to the drive pulley 33 by a drive device (for example, a motor), the main shaft 23 rotates, and this rotational force is transmitted to the shaft member 26 via the pulley 34, timing belt 35, and pulley 36. Then, as described above, the main shaft 23 and the shaft member 26 rotate in synchronization.

Since the eccentric members 24a and 24b rotate eccentrically due to the rotation of the main shaft 23, the movable spiral body 20 performs a turning motion. On the other hand, due to the rotation of the shaft member 26, the eccentric members 27a and 2
Since 7b rotates eccentrically, the movable spiral body 2
0 will be prevented from rotating and will make a turning movement. That is, the movable spiral body 20 performs circular orbital motion.

The air sucked in from the suction boat 38a shown in FIG.
1 , is sent to the center as the movable spiral body 20 rotates, and is discharged from a plurality of discharge ports 30 c formed in the first closing plate 30 into the discharge chamber 37 b. The air in the discharge chamber 37b is then sent out from the discharge port 37a.

By the way, as shown in FIG. 1, the axial length of the movable spiral body 20 is Z'I, and as shown in FIG.
1 is the axial length f12, and the range of the set clearance between the movable spiral body 20 and the first and second blocking plates 30.32 is δ1≦set clearance≦δ2,
This set clearance will be determined by IN2 N+l. That is, the above set clearance is determined only by the relative difference between the axial length of the movable spiral body 20 and the axial length of the casing 21 (the axial length of the fixed spiral body 22).

In the above embodiment, the inner rings of the bearings 25a and 25b were press-fitted into the eccentric members 24a and 24b of the main shaft 23, but the bearings 25a and 25b were inserted into the eccentric parts 24a and 24b.
The movable spiral body 20 may be substantially movable in the axial direction with respect to the main shaft 23 by disposing the movable spiral body 20 so as to be in contact with the main shaft 23 . This also applies to the eccentric members 27a and 27b of the shaft member 26.

In this way, the above-mentioned adjustment of the axial clearance becomes extremely convenient.

(Effects of the Invention) As explained above, according to the present invention, the movable thinly wound body is supported by so-called bearings at one end and the other end thereof, thereby achieving stable circular orbital motion. It can be done. In addition, since the support plate that supports the movable spiral body, which was required in the past, is no longer necessary, not only can a compact spiral fluid device be provided, but also the processing of the thinly wound body (movable and fixed spiral body) can be performed using a method other than end milling. processing method.

Further, not only is assembly easy, but also the adjustment of the axial clearance is extremely easy, which has the advantage of ensuring reliable sealing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a movable spiral-wound body used in the present invention, FIG. 2 is a view showing a casing used in the present invention together with a fixed spiral-wound body, and FIG. 3 is a diagram illustrating a thin-wound fluid device according to the present invention. 4(a) is a sectional view taken along the line A-A at the top dead center position in FIG. 3, and FIG. 4(b) is a sectional view taken along the line A-A at the bottom dead center position in FIG. 3. 5 is a sectional view showing a conventional spiral fluid device. 20... Movable spiral body, 21... Casing, 2
2... Fixed spiral body, 23... Main shaft, 26...
Shaft member. Fig. 4(b) Fig.

Claims (1)

[Scope of Claims] 1. A main shaft, a first spiral body that moves in a circular orbit by rotation of the main shaft, and a fixed second spiral body that meshes with the first spiral body; The fluid is discharged by moving toward the center in a closed space formed by the first spiral body and the second spiral body, and the first spiral body has an insertion hole portion into which the main shaft is inserted, and a closed space formed by the first spiral body and the second spiral body. a spiral portion having one end connected to the insertion portion and having the insertion portion as the center; and at least one cylindrical portion formed on the other end side of the spiral portion; A spiral fluid device characterized in that an auxiliary shaft member is inserted so as to perform circular orbital motion in synchronization with the circular orbital motion being performed. 2. In the spiral fluid device according to claim 1, the second spiral body is integrally formed with a casing that is open at both ends, and the first spiral body is inserted into the casing and the A spiral fluid device characterized in that the first spiral body and the second spiral body are engaged with each other to close both ends of the casing.