JPH0619837Y2 - Scroll fluid device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention compresses and pumps fluids such as air, gas, and steam.
The present invention relates to a scroll fluid device that expands or sucks.

[Prior Art] A scroll fluid device has a fixed scroll and a orbiting scroll having complementary shapes formed from spirals such as involutes or arcs, and has a fluid side, that is, an oil-free side and oil. The oil mist side is separated by a seal mechanism provided on the outer peripheral portion of the orbiting scroll. In the conventional scroll fluid device, a sliding seal mechanism is provided as the seal mechanism.

However, when the sliding seal mechanism is used, the mechanical loss of the rotational force of the orbiting scroll is large, and the sliding seal mechanism part needs to be precision machined, which increases the manufacturing cost. There is a possibility that oil or fluid may leak from the sliding mechanism due to insufficient separation between the side and the side.

Various scroll fluid devices are generally known, and for example, Japanese Utility Model Laid-Open No. 59-172201 discloses a technique in which a magnetic fluid seal is provided on the facing surface of each spiral member. Therefore, oil or the like flows into the oil-free side.

Therefore, JP-A-57-68578 discloses a technique of attaching a magnet to an annular groove to hold a magnetic fluid in order to separate the oil-free side and the oil mist side. However, such a known technique has a disadvantage that the magnetic fluid scatters against the magnetic force of the magnet due to the centrifugal force.

[Problem to be solved] Therefore, an object of the present invention is to provide a scroll fluid device in which the magnetic fluid does not scatter by centrifugal force and the oil-free side and the oil mist side can be reliably separated.

[Means for Solving the Problems] According to the present invention, in a scroll fluid device having an orbiting scroll (12) and a fixed scroll (14), an oil free side (A) and an oil mist side are provided on the outer peripheral portion of the orbiting scroll (12). A magnetic fluid seal (16) for separating from (B) is provided, two annular protrusions (24, 26) are provided at positions on both sides of the magnetic fluid seal (16), and these protrusions (24, 26) The gap with the magnetic fluid seal (16) is equal to or larger than the orbiting radius of the orbiting scroll (12), and the magnetic fluid (32) is the magnetic force of the magnetic device (28) of the magnetic fluid seal (16) and is on the oil free side. The space between (A) and the oil mist side (B) is filled.

[Explanation of Action and Effect] Therefore, although the magnetic fluid filled in the space between the oil-free side and the oil mist side is held by the magnetic device of the magnetic fluid seal, even if the magnetic fluid scatters due to centrifugal force, it has an annular shape. Since there is a protrusion, the scattering is prevented, so that the sealing is always performed reliably. Since the annular projection has a radius equal to or larger than the orbiting radius of the orbiting scroll, the magnetic fluid seal does not interfere with the protrusion.

That is, in the magnetic fluid seal, when the scroll orbits, the magnetic fluid in contact with the scroll is dragged and gradually flows out to both outsides of the magnetic fluid seal.
The magnetic fluid that has flowed out is temporarily stored by the two annular projections provided on both sides of the magnetic fluid seal.
The magnetic fluid that has flowed out can be pushed back to the seal portion by the swiveling motion of the annular protrusion to be recovered, and the magnetic fluid seal can be completely performed.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a scroll fluid device generally designated by reference numeral 10 has an orbiting scroll 12 and a fixed scroll 14 which are connected to a rotation driving means (not shown), and a magnetic fluid seal is provided on an outer peripheral portion of the orbiting scroll 12. 16 are provided. The magnetic fluid seal 16 is the fixed scroll 1
The oil-free side A and the oil mist side B inside 4 are separated. Here, the oil-free side A means a location where a fluid such as air, gas, or steam is compressed, pumped, expanded, or sucked, and oil is not mixed in,
On the other hand, the oil mist side is where oil is sprayed for lubrication.

In FIG. 1, reference numeral 18 indicates a suction port for sucking the fluid into the scroll fluid device 10, and reference numeral 20 indicates a discharge port for discharging the fluid. The arrow E shows the flow of the fluid sucked into the suction port 18, and the arrow O shows the flow of the fluid discharged from the discharge port 20. Reference numeral 22 indicates a thrust bearing or an automatic preventive device.

An annular projection 2 is provided inside and outside the magnetic fluid seal 16 provided on the outer peripheral portion of the orbiting scroll 12.
4, 26 are provided. FIG. 1 shows a case where the center lines of the protrusions 24 and 26 of the orbiting scroll coincide with the center lines of the magnetic fluid seal.
Is the magnitude of the orbiting radius R12 of the orbiting scroll 12 (the distance by which the protrusions 24 and 26 are laterally offset in FIG. 1). The above is provided, that is, at a position where l1 ≧ R12 and l2 ≧ R12.

Next, the magnetic fluid seal 16 and the annular projections 24 and 26 will be described in detail with reference to FIGS. 2 to 5.

The magnetic fluid seal 16 is composed of a magnetic device 28, a magnetic circuit 30 and a magnetic fluid 32 as shown in detail in FIGS. In the embodiment shown in FIG. 2, the magnetic device 28 is attached to the orbiting scroll 12, and the annular projections 24 and 26 are provided on the fixed scroll 14. On the other hand, in the embodiment shown in FIG. Device 2
8 is attached to the fixed scroll 14 and has an annular projection 2
4, 26 are provided on the orbiting scroll 12.

The magnetic fluid 32 is held at a predetermined position by the magnetic force of the magnetic device 28 (magnetic circuit 30), fills the space between the oil-free side A and the oil mist side B, and seals fluid-tightly. Since the magnetic fluid 32 is not mechanically held, it does not add a frictional force to the rotational force of the orbiting scroll 12, resulting in extremely small mechanical loss. Further, since the magnetic fluid 32 is a fluid, it has a good sealing property, and the oil-free side A and the oil mist side B are
Is sufficiently separated.

4 and 5 are views showing the action of the annular projections 24 and 26. The annular protrusions 24 and 26 are provided when the scroll orbits by the orbiting movement of the orbiting scroll 12.
When the magnetic fluid 32 in contact with the scroll is dragged and temporarily flows out from the seal 16, the magnetic fluid that has flowed out is stored, and as shown by the arrow R in FIGS. The magnetic fluid that has temporarily flown out due to the turning motion of the annular protrusions 24 and 26 is pushed back to a predetermined position in the seal 16 to be recovered.

[Effects of the Invention] As described above, according to the present invention, the following excellent effects are obtained.

(I) Even if the magnetic fluid in contact with the scroll is dragged and flows out, it can be stopped by the annular projection, and can be pushed back to the reel portion by the annular projection.

(Ii) Since the magnetic fluid does not scatter, the sealing action is reliable.

(Iii) It suffices to provide two annular projections, the structure is simple, and precision processing is not required.

(Iv) Since the annular projection is provided at a position where it does not interfere with the deviation of the orbiting scroll, it does not affect the operation.

(V) It is possible to provide a scroll fluid device that can completely separate the oil-free side and the oil mist side for a long period of time and has a long life.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a scroll fluid device of the present invention, and FIGS. 2 and 3 are partial sectional views showing different embodiments of a magnetic fluid seal used in the present invention. 4 and 5 are explanatory views showing the action of the annular protrusions provided on both sides of the magnetic fluid seal. 10 ... Scroll fluid device, 12 ... Orbiting scroll, 14 ... Fixed scroll, 16 ... Magnetic fluid seal, 24, 26 ... Annular protrusion, 32 ... Magnetic fluid,
A: Oil free side, B: Oil mist side

Claims (1)

[Scope of utility model registration request] 1. A scroll fluid device having an orbiting scroll (12) and a fixed scroll (14), wherein an oil-free side (A) is provided on an outer peripheral portion of the orbiting scroll (12).
A magnetic fluid seal (16) for separating the oil mist side (B) from the oil mist side (B) is provided, and two annular protrusions (24, 26) are provided at positions on both sides of the magnetic fluid seal (16). , 26) and the magnetic fluid seal (16) are equal to or larger than the orbiting radius of the orbiting scroll (12), and the magnetic fluid (32) is generated by the magnetic force of the magnetic device (28) of the magnetic fluid seal (16). A scroll fluid device characterized by filling a space between the oil-free side (A) and the oil mist side (B).