JPH0233482A - Scroll body fluid device - Google Patents

Abstract

PURPOSE:To make a scroll body fluid device compact by forming a slit on a bottom plate and inserting the axial end section of the second scroll body into the slit. CONSTITUTION:One end opening section of a casing 21 is closed with the first closing plate 30, a bottom plate 301 is fixed on one face of the first closing plate 30. A slit 301a is formed on the bottom plate 301, one end section in the axial direction of the second scroll body 22 is inserted into the slit 301a. A support plate supporting the movable scroll body is not required, thus the scroll body fluid device can be made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a thinly wound fluid device, and more particularly to a thinly 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. 6 is known as this type of spiral fluid device.

Referring to FIG. 6, 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 is housed in the eccentric portion 3 and extends in the radial direction 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 mesh with the spiral bodies 6a and 6b to form a closed space (fluid boget) 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 held at the end of the support plate 5 via a bearing 8a, and a shaft member 9 is eccentrically connected to this shaft member 8, 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 spiral bodies 6a and 6b.

In the above configuration, when the main shaft 2 is rotated, the eccentric portion 3
On the other hand, the support plate 5 is prevented from rotating by the rotation prevention mechanism and moves in a circular orbit, so that the fluid boget formed by the thinly wound bodies 6a and 6b and the spirally wound bodies 7a and 7b is centered. move in the direction
Air and the like taken into the fluid boget from the suction chamber (not shown) are discharged into the discharge chamber 10.

(Problems to be Solved by the Invention) Incidentally, in the case of the above-mentioned fluid device, the support plate 5 is required to rotate the thinly wound bodies 6a and 6b, and furthermore, the spirally wound bodies 6a and 6b are provided on both sides of the support plate 5. Must be formed in one piece.

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

Further, the axial clearance between the support plate 5 and the spiral bodies 7a and 7b is set in advance, but as mentioned above, due to problems in processing accuracy, both spiral bodies 6a are set.

There is a problem in that there is a difference in the spiral heights of 6b, 7a, and 7b, and therefore the axial clearance becomes larger than necessary.

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 An object of the present invention is to provide a thinly wound fluid device that is easy to process and assemble and can provide a predetermined clearance.

(Means for Solving the Problems) According to the present invention, a main shaft, a first spiral-wound body that moves in a circular orbit by rotation of the main shaft, and a fixed second spiral-wound body that meshes with the first spiral-wound body are provided. In the spiral fluid device, the fluid device has a spiral body and discharges fluid by moving toward the center in a closed space formed by the first spiral body and the second spiral body, the first spiral body is a spiral body formed with an insertion hole into which the main shaft is inserted, and whose center is the insertion hole; the second spiral body is integrally formed with the casing which is open at both ends; inserting a first spiral-wound body into the casing and engaging the first spiral-wound body and the second spiral-wound body;
Both ends of the casing are each closed by a plate, a slit having a shape corresponding to the axial end of the second spiral body is formed on the casing side of the plate, and a bottom plate corresponding to the opening is formed. By inserting the axial end of the second spiral body into the slit, the casing is held between the plate bodies. .

(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. 6. A 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 from the above-mentioned open ends, and the first spiral body and the second spiral body are separated. are engaged, and both ends of the casing are closed with plates. A slit having the same shape as the axial end of the second spiral body is formed on the casing side of this plate, and a bottom plate corresponding to the opening is fixed, and the axial end of the second spiral body is fixed to the slit. A section is inserted to hold the casing between the plates.

In the present invention, since the support plate of 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.

Furthermore, since the axial end of the second spiral body is inserted into the slit of the bottom plate to hold the second spiral body between the plates, it is easy to hold the casing and the second spiral body. It is.

(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 body 20b integrated with one end connected to the insertion portion 20a, and other parts of the spiral portion 20b. It has a circular WJ portion 20c formed at the end. The movable spiral body 20 is manufactured by conventional punching or extrusion.

On the other hand, as shown in FIG. 2, one end of a fixed thin 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 the 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 thinly wound body 20.
Eccentric members 27a and 27b are press-fitted into 8b, and the shaft member 26 is held in the cylindrical portion 20c.

One end opening of the casing 21 is closed by a first closing plate 30 .

A bottom plate 301 molded from a wear-resistant material shown in FIG. 4 is fixed to one surface (casing side) of the first closing plate 30. As shown in FIG. This bottom great 30
1 is shaped to correspond to the opening of the casing 21, and furthermore, a slit 301a corresponding to the shape of the axial end of the thinly wound body 22 is formed.

A through hole 301b through which the main shaft 23 is inserted is formed in the center of the bottom plate 301, and a through hole 30 through which the shaft member 26 is inserted.
1C is formed. Further, a plurality of discharge holes 301d are provided to communicate a discharge chamber and a fluid pocket, which will be described later.

The bottom plate 301 is provided with a plurality of mounting holes 301e in advance, and the bottom plate 301 is brought into contact with one surface of the first closing plate 30, and the positioning bin 302 is inserted into the mounting hole 3.
01e to secure the first closing plate 30 and the bottom plate 301.

When one end opening of the casing 21 is closed with the first closing plate 30, the axial end of the thinly wound body 22 is connected to the slit 3.
01a. That is, the thinly wound body 22 is held in the slit 301a.

The movable spiral body 20 is inserted from the other end opening of the casing 21. As a result, the spiral portion of the movable spiral body 20 and the fixed spiral body engage with each other as shown in FIGS. 5(a) and 5(b), and a sealed space (main pocket) 31 is formed.

One end of the main shaft 23 passes through a through hole 301b of the bottom plate 301 and is rotatably supported by the first closing plate 30 by a bearing 30a. Similarly, the shaft member 26
passes through the through hole 301C of the bottom grate 301 and is rotatably supported by the first closing plate 30 by the bearing 30b. At this time, the spiral portion 2 of the movable spiral body 20
A chip seal 29 provided at one end of 0b comes into contact with one surface of the bottom plate 301.

Next, the other end opening of the casing 21 is connected to the second closing plate 32.
occluded by

A bottom plate 321 is fixed to one surface (casing side) of the second closing plate 32 in the same manner as the first closing plate. Bottom plate 321 is bottom plate 3
Since the configuration is similar to that of 01, the explanation will be omitted here.

The other end opening of the casing 21 is connected to the second closing plate 3.
0, the other axial end of the thinly wound body 22 is inserted into the slit 321a, and the thinly wound body 22 is held in the slit 321a. In addition, the main shaft 23 and the shaft member 26
The a-ends are rotatably supported by the second closing plate 32 by bearing members 32a and 32b, respectively. In addition,
The tip seal 29 of the thinly wound body 210b is in contact with the surface of the bottom plate 321 of the second closing plate 32.

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 one 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 boat 37a is formed is attached to the other end of the second closing plate 32 (the surface in FIG. 3).

The operation of the above-mentioned 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.

The rotation of the main shaft 23 causes the eccentric members 24a and 24b to eccentrically rotate, so the movable thinly wound 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 thinly wound body 20 performs circular orbital motion.

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

By the way, as shown in FIG. 1, the axial length of the movable thinly wound body 20 is jl, as shown in FIG. 2, the axial length of the casing 21 is Il□, and the movable thinly wound body 20 and the first
If the range of the set clearance between the first and second closing plates 30, 32 is δ1≦set clearance≦δ2, this set clearance is determined by Ij2 J+l. That is, the above set clearance is determined only by the relative difference between the axial length of the movable thinly wound body 20 and the axial length of the casing 21 (the axial length of the fixed thinly wound 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 members 24a and 24b.
4a and 24b, so that the movable spiral body 20 can be moved in the axial direction with respect to the main shaft 23. This also applies to the eccentric members 27a and 27b of the shaft member 26. be.

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

Further, since the thinly wound body 22 is inserted into the slit of the bottom plate and the thinly wound body 22 is substantially held between the first and second closing plates, there is no need to fix the thinly wound body again. A thinly rolled body can be easily held.

Furthermore, by using a wear-resistant material for the bottom plate and improving the surface roughness of the bottom plate, wear of the tip seal can be prevented without paying attention to the surface roughness of the first and second blocking plates. .

(Effects of the Invention) As explained above, the present invention eliminates the need for a support plate for supporting the movable thinly wound body, which was conventionally required, and therefore not only can provide a compact thinly wound body fluid device, but also the thinly wound body (Movable and fixed thinly wound bodies) can be processed using a processing method other than end mill processing.

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.

Furthermore, the axial end of the fixed thinly wound body is inserted into the slit of the bottom plate, and the fixed thinly wound body is essentially held between the plates, making it easy to fix the fixed thinly wound body. There are advantages.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a movable thinly wound body used in the present invention, Fig. 2 is a view showing a casing used in the present invention together with a fixed thinly wound body, and Fig. 3 is a diagram of a thinly wound body fluid device according to the present invention. FIG. 4 is a sectional view showing the main parts; FIG. 4 is a diagram showing the shape of the bottom plate used in the present invention; FIG. 5(a)
is a cross-sectional view taken along the line A-A at the top dead center position in FIG. 3, and FIG. 5(b) is a cross-sectional view taken along the line A-A at the bottom dead center position in FIG.
FIG. 6 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. ￥1 figure 2 figure 26 opening

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; In the spiral fluid device that discharges fluid by moving toward the center in a sealed space formed by the first spiral body and the second spiral body, the first spiral body has an insertion hole into which the main shaft is inserted. The second spiral body is integrally formed with the casing which is open at both ends, and the first spiral body is attached to the casing. The first spiral body and the second spiral body are inserted and engaged, and both ends of the casing are closed with plate bodies, and the shaft of the second spiral body is inserted on the casing side of the plate body. A slit having a shape corresponding to the directional end is formed, and a bottom plate corresponding to the opening is fixed, and by inserting the axial end of the second spiral body into the slit, the casing is A spiral fluid device characterized by being held between plate bodies. 2. The spiral fluid device according to claim 1, wherein the first spiral body is movable in the axial direction.