JPH01142286A - Oilless scroll device - Google Patents

Abstract

PURPOSE:To prevent a cooling liquid from entering oil side by providing a seal device between both mutually opposite outer periphery portions of a revolving scroll and a fixed scroll and providing a cooling-liquid discharging mechanism on the outer peripheral end of the revolving scroll and the inside face of a casing. CONSTITUTION:An annular seal device 20 for separating an oilless side and an oil side is provided between both mutually opposite outer periphery portions of a revolving scroll 1 and a fixed scroll 2. Lap-formed annular cooling-liquid discharging mechanisms 30, 31 are provided on the outer peripheral end of the revolving scroll 1 and the inside face of a casing. Thereby, a cooling liquid on an oilless side filled inside the scroll will not enter an oil side preventing the deterioration of oil due to the mixing in of the cooling liquid.

Description

[Detailed description of the invention] [Industrial application field] The present invention compresses and expands air, gas, water vapor, etc.

Scroll device used for suction (i-roll compressor)
Regarding.

[Conventional technology]

As shown in FIG. 2, a conventional scroll device has an orbiting scroll (1a) having one spiral member 1a wound spirally.
A fixed scroll 2 having a spiral member 2a of the same shape formed so as to overlap the spiral member 1a is eccentrically opposed to the spiral member 1a.

In the figure, 20 is for separating a fluid chamber 21 (oil-less side) for air, gas, water vapor, etc. opened to the suction port 9 from an oil chamber 22 (oil side) opened to the oil hole 17a. In this embodiment, a sliding seal mechanism is used, which is an annular sealing device provided between opposing outer peripheral portions of the orbiting scroll 1 and the fixed scroll 2. In the figure, 1a
+2a is a spiral member, and 8 is a thrust bearing and an anti-rotation mechanism.

[Problem that the invention seeks to solve]

In the conventional device 1 (FIG. 2) described above, the fluid chamber (
In order to cool the fluid (on the oil-less side) 21, for example, when a cooling liquid such as water is injected into the fluid, it is fine during normal operation, but in a situation such as an unexpected stop, the cooling liquid may There was a problem that the inside of both the scrolls 1 and 2 surrounded by the spiral member 1 a + 2 a K could be filled, and there was a possibility that the oil could enter the oil chamber (oil side) 22 through the sealing device 20 .

The technical problem of the present invention is to prevent the cooling liquid filled inside the scroll from passing through the sealing device and entering the oil side in a situation such as an unexpected stoppage.

[Means for solving problems]

In order to solve the problems and technical problems of the prior art described above, the present invention provides an annular sealing device that separates an oil-less side and an oil side between opposing outer peripheries of an orbiting scroll and a fixed scroll. The present invention is characterized in that an annular coolant discharge mechanism having a wrap shape is provided at the outer circumferential end of the orbiting scroll and the inner surface of the casing.

[For production]

Since the present invention is configured as described above, during operation,
Compressible fluid such as air, gas, and water vapor sucked in through the suction port is caused by the orbiting (revolution) movement of the orbiting scroll, and the spiral member of the orbiting scroll contacts the spiral member of the fixed scroll (position). As the liquid rotates while sequentially moving from the periphery to the center, it is compressed and transferred to the center, and is discharged to the outside from the outlet in the center.

During this operation, there is one internal cooling device in the scroll chamber, e.g.
A cooling liquid such as water may be injected, but since the inner surface of the annular sealing device surrounding the scroll chamber is on the suction side of the scroll chamber, the fluid inside the scroll chamber is There is no risk of leakage to the oil side outside the sealing device.

In addition, when an unexpected situation occurs and the equipment stops, even if the oil-less side cooling fluid fills the scroll chamber and enters the outside through the annular sealing device, the outer peripheral edge of the orbiting scroll Due to the wrap-shaped annular coolant discharge mechanism provided on the inner surface of the casing, the coolant cannot flow into the discharge mechanism and flows outside as a drain. It is discharged. Therefore, it does not enter the oil side.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a main part of an embodiment of the present invention, and in the figure, the same reference numerals as those shown in FIG. 2 indicate the same or similar parts.

In the figure, the spiral member 1a on the upper surface of the orbiting scroll 1 is installed eccentrically by the orbit radius from the spiral member 2a on the upper inner surface of the fixed scroll 2, which also serves as an upper casing. As the spiral members 1a and 2a rotate eccentrically as they rotate, the contact point between the spiral members 1a and 2a moves from the periphery to the center, and as a result, the fluid is transferred to the suction port 9.
The rotating scroll 1 and the fixed scroll 20 face each other in order to separate the scroll chamber (oil-less side) from the outer oil side. There is no difference from the conventional one (Fig. 2) in that an annular sealing device 20 is provided between the outer peripheries. In the figure, 8 is a thrust bearing and a rotation prevention mechanism.

In the present invention, the end of the outer peripheral portion 1b of the orbiting scroll 1;
A wrap-shaped annular coolant discharge mechanism 30.31 is provided on the inner surface of the casing (the upper casing and the lower casing 7, which are composed of the fixed scroll 2).

The cooling liquid discharge mechanism 30.31 has an annular vertical wall 30a that stands up at the end of the outer peripheral portion 1b of the orbiting scroll 1, and an annular vertical wall 30a extending outward from the upper end of the vertical wall 30a. An annular member 30 consisting of a horizontal wall 30b and an annular edge 30c extending vertically downward from the horizontal wall 30b is attached to the inner surface of the casing with a slight gap between the lower surface of the horizontal wall 30b and the lower surface of the horizontal wall 30b. Each of the projecting annular vertical walls 31 is provided and communicated with the oil chamber 22 through the gap between the vertical walls 30a and 31 through the oil holes 17aK. Also these coolant discharge machines B30.31
An external drain port 33 is provided in the chamber 32 provided with.

With the above configuration, when an unexpected situation occurs and the scroll device stops, the oil-less cooling fluid fills the scroll chamber 211C and passes through the annular seal device 20. Even if it enters the chamber 32 as shown by the arrow 34, it bypasses the outside of the annular member 30 provided at the outer peripheral end of the orbiting scroll and is discharged to the outside through the external drain port 33.

At this time, the coolant that has entered the inside of the annular member 30 is directed to the annular vertical wall 31 that projects inward and vertically upward, and does not enter the oil chamber 22.

〔Effect of the invention〕

As explained above, according to the present invention, an annular sealing device is provided between the opposing outer peripheral portions of the orbiting scroll and the fixed scroll to separate the oil-less side and the oil side,
In addition, by providing a wrap-shaped annular coolant discharge mechanism on the outer peripheral end of the orbiting scroll and the inner surface of the casing, even if an unexpected incident occurs and operation is stopped, the scroll The coolant on the oil-less side, which is filled inside, does not enter the oil side, and it is possible to eliminate roughness caused by oil deterioration caused by mixing of the coolant.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a scroll device showing an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a conventional example. 1... Orbiting scroll, la... Spiral member. 1b... Orbiting scroll outer circumference. 2... fixed scroll, 2a... spiral member. 7...Lower casing 81+*Thrust bearing and rotation prevention mechanism, 9...Suction port, 10...Discharge port. 20... Annular sealing device, 21... Scroll chamber (oil-less side), 22... Oil chamber (oil side), 30.31... Annular coolant discharge mechanism. 33...Drain port.

Claims (1)

[Claims] In an oil-less scroll device that compresses, expands, and sucks air, gas, water vapor, etc., an annular seal device is installed between the opposing outer peripheries of the orbiting scroll and the fixed scroll to separate the oil-less side and the oil side. 1. An oil-less scroll device characterized in that an annular coolant discharge mechanism having a wrap shape is provided at the outer peripheral end of the orbiting scroll and the inner surface of the casing.