JPH0281979A - Volute structural fluid device - Google Patents

Abstract

PURPOSE:To contrive the more smallness in size suppressing space between a boss part and a casing to a minimum limit by providing a connection part with the boss part connected to a crack pin and a notched part formed in the periphery of a driven shaft. CONSTITUTION:The second boss part 4 is constituted of connection parts 5, 6, connected to eccentric members 33, 34 of a driven shaft 30, and a notched part 7 formed in the periphery of the driven shaft 30 in a manner wherein one part of the driven shaft 30 is exposed. The central part of the driven shaft 30 is exposed by the notched part 7 in the second boss part 4, and this exposed portion mounts a balance weight 39 for eliminating dynamic unbalance by the eccentric members 33, 34 and the second boss part 4. Thus by arranging the balance weight 39 in the notched part 7 of the second part 4, space in a casing 8 can be effectively utilized, as a result, a volute structural fluid device more facilitates its smallness in size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spiral fluid system, and more particularly to a spiral fluid system used in a supercharger floor with a low pressure level.

[Prior Art] A scroll-type fluid device, that is, a thinly wound fluid device characterized by eliminating the plate from the scroll member, has been proposed by the applicant of the present invention (for example, Japanese Patent Application No. 1881-1983).
No. 781).

This thinly wound body fluid device includes a movable thinly wound body that extends along a spiral curve and has a boss portion at the outer peripheral end, a driven shaft that is inserted through the boss portion and is equipped with a crank pin, and a rosette that is attached to the driven shaft. Contains Nisweet.

The movable spiral body is connected to the main shaft at its center side, and by the rotation of this main shaft and driven shaft, the movable spiral body apparently performs circular orbital motion without rotating on its own axis. It has become.

FIG. 4 is a sectional view of the vicinity of the inlet of an example of a conventional spiral fluid device.

Referring to FIG. 4, the fluid sucked from the suction port 42 is
The fluid passes around the boss portion 4 of the movable spiral body 1 and flows to the center of the spiral fluid device. Moreover, movable thin winding body 1
Since it moves in a circular orbit, it requires a large space between the casing 8 and the boss portion 4.

[Problem to be solved by the invention] As mentioned above, the movable spiral body performs circular orbital motion, and at this time, ideally, the center of gravity of the movable spiral body coincides with the driving point on the main shaft side. It is.

However, since the movable spiral body has a boss portion at the outer peripheral end, the center of gravity of the movable spiral body is shifted from the driving point on the main shaft side to the boss portion side at the outer peripheral end. This resulted in poor dynamic balance, causing vibrations and uneven wear.

On the other hand, as mentioned above, a large space is required between the boss portion at the outer peripheral end and the casing, so the casing tends to become large, which hinders the miniaturization of spiral fluid devices. There is.

Therefore, an object of the present invention is to provide a spiral-wound fluid device in which the center of gravity of the movable spiral-wound body is close to the driving point on the main shaft side, and which can be easily miniaturized.

[Means for Solving the Problems] According to the present invention, a movable spiral body extends along a spiral curve and has a boss portion at the outer peripheral end, a driven shaft that extends through the boss portion and includes a crank pin, and the driven shaft. In the spiral fluid device including a balance weight attached to a shaft, the boss portion includes a connecting portion connected to the crank pin and a notch formed around the driven shaft. A characteristic spiral fluid device is obtained.

[Function] In the case of the thinly wound body fluid device of the present invention, the boss portion provided at the outer peripheral end of the movable spiral body is provided with a notch, and as a result, the weight of this boss portion is reduced, and the movable spiral body is reduced in weight by that amount. The center of gravity of the body moves closer to the driving point on the spindle side, reducing vibrations, uneven wear, etc.

On the other hand, since the boss portion provided at the outer peripheral end of the movable spiral body is provided with a notch, fluid passes through the notch and is efficiently sucked in. Therefore, it is possible to minimize the space between the boss portion provided at the outer circumferential end of the movable spiral body and the casing, thereby facilitating downsizing of the spiral fluid device.

[Embodiment] Fig. 1 is a sectional view of a spiral fluid device according to an embodiment of the present invention, Fig. 2 is a perspective view of a movable spiral body of the spiral fluid device shown in Fig. FIG. 2 is a perspective view of the casing and stationary spiral-wound body of the spiral-wound fluid device shown in the figures;

Referring to FIGS. 1 to 3, the movable spiral body 1 includes a spiral bowl body 2 extending along a spiral curve, a first boss portion 3 provided at the center end of the spiral bowl body 2,
A second boss portion 4 provided at the outer peripheral end of the whirlpool bowl body 2
It consists of These swirling bowl main body 2, first boss part 3
, and the second boss portion 4 are integrally formed.

The second boss portion 4 is an eccentric member 33 of the driven shaft 30, which will be described later.
34, and a notch 7 formed around the driven shaft 30 so as to expose a part of the driven shaft 3n (see FIG. 2). Both ends are open, and a fixed spiral body 9 extends from its inner wall following the same spiral curve as the movable spiral body 1. The casing 8 and the fixed spiral body 9 are integrally formed (see FIG. 3).

A movable thin spiral body 1 is arranged within the casing 8, and this movable spiral body 1 engages with a fixed spiral body 9 to form a fluid pocket 10.

Both ends of the casing 8 are each closed by a closing plate 1.5.16. One of the closing plates 15 has a discharge port (not shown) for discharging the fluid compressed within the fluid pocket 10.
is provided.

The main shaft 17 is inserted into the first boss portion 3 of the movable thinly wound body and is rotatably supported by ball bearings 18.19 respectively attached to the center of each closing plate 15.16. The main shaft 17 has a crank pin,
A disk-shaped eccentric member 20° 21 having a larger diameter than the main shaft 17 and eccentric from the center of the main shaft 17 is attached. Each eccentric member 20, 21 is connected to the first boss portion 3 via a ball bearing 22, 23, respectively. A timing pulley 24 is attached to one end of the main shaft 17, and a pulley 25 for manually applying driving force from an external power source (for example, an engine) is attached to the other end. Furthermore, spindle 1
Near both ends of 7, a movable spiral body 1 and an eccentric member 20 are installed.
．． Balance weights 26 and 27 are respectively attached to eliminate the dynamic unbalance caused by 21.

The driven shaft 30 is inserted into the second boss portion 4 of the movable spiral body 1, and is rotatably supported by ball bearings 31, 32 respectively attached to the upper part of each closing plate 15, 16. Disc-shaped eccentric members 33 and 34, which have a larger diameter than the driven shaft 30 and are eccentric from the center of the driven shaft 30, are attached to the driven shaft 30 as crank pins. These eccentric members 33, 34 are similar to the eccentric member 20 of the main shaft 17.
It is eccentric by the same amount as 21 degrees and has the same orientation as the eccentric members 20.21. Each eccentric member 33, 34 is connected to a connecting part 5, 6 of the second boss part 4 via a respective ball bearing 35, 36.

A timing pulley 37 is attached to one end of the driven shaft 30, and a timing belt 38 is attached between the timing pulley 37 and the timing pulley 24 attached to the main shaft 17, so that the driven shaft 30 is connected to the main shaft. It is designed to rotate in synchronization with 17. Therefore, when the main shaft 17 rotates, the driven shaft 30 also rotates in synchronization with this, and the first boss portion 3 connected to the eccentric member 20.21 of the main shaft 17 and the eccentric member 33.34 of the driven shaft 30 rotate. The connected second boss part 4 draws the same circular orbit, and as a result,
The movable spiral body 1 as a whole moves in a circular orbit without apparently rotating on its own axis.

The center portion of the driven shaft 30 is exposed through the notch 7 of the second boss portion 4, and an eccentric member 33.
34 and a balance weight 39 for eliminating dynamic unbalance caused by the second boss portion 4 are attached. Incidentally, conventionally, the balance weights attached to the driven shaft were placed near both ends of the driven shaft, but as in this embodiment, three balance weights are placed inside the notch 7 of the second boss part 4. As a result, the space within the casing 8 can be used effectively, and as a result, it is easier to downsize the spiral fluid device.

A cover 40 is attached to the closing plate 15, and this cover 40 protects the timing pulley 24.37, the timing belt 38, etc.

Further, the cover 40 is provided with a discharge port 41 for discharging the fluid discharged from the discharge port of the closing plate 15 to the outside of the spiral body fluid device.

In this embodiment, two connecting parts 5.6 are provided, and the notch 7 is provided between them, but the present invention is not limited to this. Three connecting parts are provided, and the notch 7 is provided between them. Alternatively, one connecting portion may be provided in the center, and notches may be provided on both sides of the connecting portion.

[Effects of the Invention] The spiral body fluid device of the present invention can bring the center of gravity of the movable spiral body close to the driving point on the main shaft side, and as a result, vibrations, uneven wear, etc. can be eliminated.

Further, the spiral fluid device of the present invention can minimize the space between the boss portion provided at the outer peripheral end of the movable spiral body and the casing, and therefore can be further miniaturized.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a wax-wound fluid device according to an embodiment of the present invention, FIG. 2 is a perspective view of a movable spiral body of the spiral-wound fluid device shown in FIG. 1, and FIG. 3 is the same as shown in FIG. A perspective view of the casing and fixed spiral body of the spiral fluid device, and FIG. 4 is a sectional view of the vicinity of the inlet of an example of the conventional spiral fluid device. 1... Movable spiral body, 2... Whirlpool bowl body, 3
...first boss part, 4...second boss part, 5,6.
...Connection part, 7... Notch part, 8... Casing, 9
... fixed spiral body, 10 ... fluid pocket, 15
．． 16...Closure plate, 17... Main shaft, 18.19...
・Ball bearing, 20.21...Eccentric member, 22
．． 23... Ball bearing, 24... Timing pulley, 25... Pulley, 26..., 27... Balance weight, 30... Driven shaft, 31.32...
Ball bearing, 33°34... Eccentric member, 35.
36... Ball bearing, 37... Timing pulley, 38... Timing belt, 39... Balance weight, 40... Cover, 41... Discharge port, 4
2...Inhalation port. Figure 2 Figure 3

Claims (1)

[Claims] 1. A movable spiral body extending along a spiral curve and having a boss portion at the outer peripheral end, a driven shaft inserted through the boss portion and equipped with a crank pin, and a balance weight attached to the driven shaft. In the spiral fluid device, the boss portion includes a connecting portion connected to the crank pin;
and a notch formed around the driven shaft. 2. The spiral fluid device according to claim 1, wherein the cutout exposes the driven shaft, and the balance weight is disposed within the cutout.