JPH01208586A - Dry oilless scroll device - Google Patents

Abstract

PURPOSE:To positively cool a high temperature portion and increase the life of the captioned device by forming connecting holes in a revolving scroll, a shaft, and a balance weight respectively, producing a circulating flow in the inside of a lower casing, and providing a cooling mechanism midway on the course of the circulating flow. CONSTITUTION:The spiral member 1a on the top face of a revolving scroll 1 is eccentrically installed by a defined turning radius (e) with respect to the spiral member 2a on the upper portion inner face of a fixed scroll 2. As the revolving scroll 1 is eccentrically revolved accompanying the rotation of a shaft 4, the contact points of the spiral members 1a, 2a are moved to transfer a fluid from a suction port A to a discharge port B. In this structure, a number of holes 8-10 which connect each inside of a bearing supporting portion 16 on the back portion of the revolving scroll 1, the shaft 4 supported by a bearing 3, and a balance weight 5 are formed. An outside cooling mechanism 12 is provided on a lower casing 7 on the course of a circulating flow 11 produced by the holes 8-10.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a scroll device (8 scroll devices) used to compress, expand, and suck air, gas, water vapor, etc. between scrolling devices.

[Conventional technology]

As shown in FIG. 3, a conventional scroll device has an orbiting scroll (
A fixed scroll 2, which also serves as an upper casing and has a spiral member 2a of the same shape formed so as to overlap the spiral member 1a, is provided so as to face each other eccentrically (an amount of eccentricity e). The fixed scroll 2 is provided with a suction port A on its outer periphery for sucking in fluid when used as a compressor, and a discharge port B in its center. It is driven via a shaft 4 supported by a bearing 3 and whose upper part is rotated in the direction of the arrow by an eccentric amount (turning radius) e, and the shaft 4 is rotated in the direction of the arrow. It is being In the figure, 6 is a thrust bearing and rotation prevention mechanism, and 7 is a lower casing.

[Problem to be solved by the invention]

When the above-mentioned conventional scroll device is used as a compressor, in the case of a wet type that injects cooling fluid into the scroll chamber, the oil gas used as the injected fluid is absorbed by other fluids from the heat of gas compression and bearings, etc. Since the generated heat is cooled down, the leapfrog was particularly important.

However, with the dry oil-less type, heat accumulates inside the scroll chamber, and the heat generated by the bearings and the gas compression heat, which is much higher than that of the wet type scroll pressure II machine, are transferred to the back of the orbiting scroll, the bearings, and the rotor. There were seven problems, including aging effects, strength problems, and shortened machine life.

The present invention prevents the heat generated as described above from accumulating inside the casing and carries it out to the outside, so that it does not have a thermal effect on the back of the orbiting scroll, the bearing, the rotor, etc., and extends the life of the machine. This is considered a technical issue.

[Means to solve the problem]

In order to solve the above technical problems, the present invention provides a communication hole in the orbiting scroll, the shaft and the balance weight,
It is characterized in that a circulating flow of fluid is formed inside the lower casing at the back of the orbiting scroll, and a cooling mechanism is provided in the circulating flow.

The cooling mechanism is preferably provided outside or inside the lower casing side wall, which corresponds to the path of the circulation flow.

[For production]

Since the present invention is configured as described above, during operation, compressible fluids such as air, gas, and steam sucked in from the suction port are transferred to the spiral members of the orbiting scroll by the orbiting (revolution) movement of the orbiting scroll. As the liquid rotates while sequentially moving its contact point (position) from the periphery to the center with respect to the spiral member of the fixed scroll, it is pressed and transferred to the center and is discharged to the outside from the discharge port in the center.

During the above operation, in the lower casing at the back of the orbiting scroll, a circulating flow of fluid flows from the shaft toward the end of the balance weight into the lower casing through the communication hole bored in the orbiting scroll, the shaft, and the balance weight. Particularly when the fluid passes through the communication hole of the balance weight, it is subjected to centrifugal force directed in the radial direction, and the above-mentioned circulating flow becomes a forced circulating flow.

Cooling mechanisms such as air cooling fins and water jackets are installed on the side surface of the lower casing, which corresponds to the path of the forced circulation flow, so that the internal heat generated in the bearings, shafts, back of the orbiting scroll, rotor, etc. The circulating flow exchanges heat with the cooling tree and carries it out of the casing as appropriate.

In this way, there is no need for thermal effects on the back of the orbiting scroll, the bearings, the rotor, etc., thereby extending the life of the machine.

〔Example〕

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

FIG. 1 is a cross-sectional view of a main part of a dry oilless scroll device according to a first embodiment of the present invention used as a press machine, and in the figure, the same reference numerals as those shown in FIG. 3 are used. shall indicate the same or similar parts.

In the figure, the spiral member 1a on the upper surface of the orbiting scroll 1 is eccentrically installed by a revolution radius e from the spiral member 2a on the upper inner surface of the fixed scroll 2, which also serves as the upper casing. As the spiral members 1a and 2a rotate eccentrically, the contact point between the spiral members 1a and 2a moves from the periphery to the center, and as a result, fluid is sucked in from the suction port A and discharged from the discharge port B in the center. There is no difference from the conventional one (Fig. 3). In the figure, 6 is a thrust bearing and rotation prevention 1 [, 7 is a lower casing.

In this embodiment, holes 8, 9, . R and 10 are respectively provided to form a fluid circulation flow 11 inside the lower casing 7 at the back of the orbiting scroll, and air cooling fins and water jackets are provided at the side wall end of the lower casing 7 corresponding to the path of the circulation flow 11. An external cooling mechanism 12 is provided.

With the above structure, during operation, inside the lower casing 7 at the back of the orbiting scroll 1, the fluid inside the casing is transferred to the bearing support part 1b at the back of the orbiting scroll 1.
, through communication holes 8, 9 and 10 formed in the shaft 4 and the balance weight 5, respectively, to form a circulating flow 11 as shown by the arrow, and the side wall end of the lower casing 7 corresponding to the path of the circulating flow 11. Due to the external cooling mechanism 12 provided in the section, the heat contained in the circulating flow 11 is extracted by a heat exchange flow 13 indicated by an arrow flowing through the side wall,
It is cooled externally to the Kussinga.

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

In this embodiment, the bearing support part 1b on the back of the orbiting scroll is
Cooler #I 22 is installed in the path of the circulating flow 11 flowing as shown by the arrow through communication holes 8.9 and 1o drilled in the shaft 4 and balance weight 5, respectively. It differs from the first embodiment (FIG. 1) in that it is provided inside.

According to this embodiment, compared to the first embodiment in which external cooling 111fl12 is provided, circulating flow 11 is
[Since it is cooled by direct contact with 22, the cooling effect is improved. In this case, the refrigerant in the internal cooling mechanism 22 penetrates the wall surface of the casing 7 and is guided to the outside to be cooled.

In both of the embodiments described above, the structure in which the cooling mechanism is installed at the end of the side wall of the lower casing has been described, but it goes without saying that the installation location of the cooling mechanism is not limited to the above-mentioned locations.

[Effects of the Invention] As described above, according to the present invention, communication holes are provided in the orbiting scroll, the shaft, and the balance weight, a circulating flow of fluid is formed inside the lower casing at the back of the orbiting scroll, and the circulating flow is By providing a cooling mechanism for these, a forced circulation flow is created by the centrifugal force generated when passing through the balance weight formed on the rotating shaft, which actively cools high-temperature parts such as the back of the orbiting scroll, bearings, and rotor inside the casing. Since the scroll device is cooled directly, the life of the scroll device can be further extended.

[Brief explanation of the drawing]

1 and 2 are sectional views of main parts showing first and second embodiments of the present invention, and FIG. 3 is a sectional view of main parts showing a conventional example. l...Orbiting scroll, 2...Fixed scroll, 3
...bearing, 4...shaft, 5...balance weight,
6... Bearing and rotation prevention mechanism, 7... Lower casing, 8.9.10... Communication hole, 11... Circulating flow,
12.22... Cooling mechanism, 13... Heat exchange flow, A
...Suction port, B...Discharge port Fig. 1 Fig. 2

Claims (1)

[Claims] 1. In a dry oil-less scroll device that compresses, expands, and sucks air, gas, etc., communication holes are provided in the orbiting scroll, the shaft, and the balance weight to allow fluid to flow inside the lower casing at the back of the orbiting scroll. Create a circular flow of
A cooling mechanism is provided in the circulating flow, and the centrifugal force when the fluid passes through the communication hole is used to forcibly cool high temperature parts such as the back of the orbiting scroll, the bearing, and the rotor. Dry oilless scroll device. 2. A communication hole is provided in the orbiting scroll, the shaft, and the balance weight to form a circulating flow of fluid inside the lower casing at the back of the orbiting scroll, and a cooling mechanism is provided outside or inside the side wall of the lower casing that corresponds to the path of the circulating flow. Claim 1 characterized in that the heat inside the casing is extracted to the outside of the casing via the refrigerant of the cooling mechanism.
The dry oilless scroll device described.