JPH0749025Y2 - Oil-free scroll fluid device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a scroll fluid device that compresses, expands, and sucks fluid such as air, gas, and water vapor by relative motion between an orbiting scroll and a fixed scroll. More specifically, the present invention relates to an oil-free scroll fluid device configured to achieve an oil-free state in which oil and oil mist for lubricating bearings and the like do not enter a fluid suction chamber or a compression chamber.

[Prior Art] A conventional scroll fluid device is configured, for example, as shown in FIG. In FIG. 2, the scroll fluid device generally designated by reference numeral 1 is roughly composed of a frame 2, a fixed scroll 3 fixed to the frame 2, and an orbiting scroll 4 that orbits with respect to the frame 2. Between the fixed scroll 3 and the orbiting scroll 4,
Suction chamber 5 and compression chamber 6 for fluids such as air, gas and water vapor
Is formed, and the fluid is sucked into the suction chamber 5 through the suction port 7 (shown by arrow E), while the gas compressed in the compression chamber 6 is discharged through the discharge port 8 (arrow). O).

Reference numeral 9 is the back part of the orbiting scroll 4 (the lower part in FIG. 3).
Is a bearing and a rotation preventive device provided in the vehicle. Oil and oil mist are supplied to lubricate the bearing 9.

In such a scroll fluid device 1, the suction chamber 5,
In order to realize the oil-free state of the compression chamber 6, a method of injecting a liquid other than oil, for example, water into the suction chamber 5 and the compression chamber 6, and a method of not injecting the liquid into the suction chamber 5 and the compression chamber 6 at all. There is a method of maintaining a dry state by an appropriate means.

In these cases, a means for preventing oil or oil mist supplied to lubricate the bearing and the orbiting scroll rotation preventing device 9 from entering the suction chamber 5 and the compression chamber 6 via the chamber 10 is provided. It is necessary to provide. Therefore, the second
In the prior art shown in the figure, a fixed bellows is provided. The bellows 11 shown in FIG. 2 is provided to separate the oil mist side chamber 10 from the suction chamber 5 and the compression chamber 6 with respect to oil and oil mist, and one end thereof is connected to the outer peripheral surface of the orbiting scroll 4. It is fixed, and the other end is fixed to the frame 2.

Here, depending on the type of fluid that is sucked and compressed by the oil-free scroll fluid device, the structure of the bellows is designed so that the fluid does not corrode or damage the bellows.
It is necessary to change the material and wall thickness to correct the rigidity of the bellows.

However, since the conventional bellows 11 is a fixed type, when replacing the bellows 11 with another structure or material, the suction chamber 5, the compression chamber 6 and the oil mist side chamber 10 are completely separated, and In order to maintain the rigidity of the bellows suitable for maintaining the smooth orbit of the orbiting scroll 4, not only the bellows 11 but also the frame 2 and the orbiting scroll 4 to which the ends are fixed must be replaced. Replacing members other than such a bellows is very time-consuming, resulting in an increase in maintenance parts and a rise in cost. for that reason,
When replacing the bellows, without changing parts other than the bellows and its mounting means, the length of the bellows (second
There has been a demand for an oil-free scroll fluid device in which the rigidity of the bellows can be adjusted by adjusting the dimension in the height direction in the figure) and thus the smooth orbiting motion of the orbiting scroll can be achieved.

In this type of scroll fluid device, for example, Japanese Unexamined Patent Publication No.
The one disclosed in JP-A-157789 does not have a bellows. Further, Japanese Utility Model Laid-Open No. 62-54294 and Japanese Patent Laid-Open No. 58-58294
No. 59392 discloses a bellows provided, but the rigidity cannot be adjusted by changing the length of the bellows.

[PROBLEMS TO BE SOLVED] Accordingly, an object of the present invention is to provide an oil-free scroll fluid device in which the length of the bellows can be easily changed depending on the type of fluid to be handled, and thus the rigidity of the bellows can be changed.

[Means for Solving the Problems] According to the present invention, in the oil-free scroll fluid device that compresses, expands, and sucks fluid by the relative motion of the orbiting scroll and the fixed scroll, the upper end extends radially outward from the orbiting scroll. Provide a bellows that abuts the flange and the lower end is detachably attached to the frame,
The cylindrical portion having the flange is sandwiched between an upper cylindrical sleeve and a lower cylindrical sleeve that are detachably provided on the orbiting scroll, and the upper cylindrical sleeve is attached to the outer peripheral portion of the orbiting scroll by a bolt nut, and the lower cylindrical sleeve is attached. Has a lower end engaged with a step portion on the outer periphery of the orbiting scroll, and the cylindrical portion of the flange has the same total length of the upper cylindrical sleeve and the lower cylindrical sleeve. Are available in different lengths.

[Description of Action and Effect] Therefore, in operation, the suction chamber and the compression chamber formed between the orbiting scroll and the fixed scroll by the bellows are completely separated from the oil mist side chamber, as in the prior art. .

When mounting bellows of different lengths, the flange and the lower cylindrical sleeve can be removed from the orbiting scroll by removing the bolt nut and removing the upper cylindrical sleeve. Therefore, the bellows is removed from the frame, and the lower end of another bellows having a different length is attached to the frame. Then select a lower cylindrical sleeve and an upper cylindrical sleeve corresponding to the length of the other bellows, engage the lower cylindrical sleeve with the step portion of the orbiting scroll, attach the cylindrical portion of the flange, and attach the upper cylindrical sleeve to the bolt nut. Then, the bellows may be fixed to each other and the upper end of the bellows may be brought into contact with the flange.

When the bellows are replaced in this way, the bellows, the upper cylindrical sleeve and the lower cylindrical sleeve may be replaced, and the replacement work can be easily performed. Therefore, when it is desired to change the rigidity of the bellows depending on the type of fluid, the work is easy.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, the same members as those in FIG. 2 are designated by the same reference numerals.

The oil-free scroll fluid device of FIG. 1 has substantially the same structure as that of FIG. 2, but the structure of the member for mounting the bellows 11 is different. The upper end 11A of the bellows 11 is in contact with the flange 30. The cylindrical part 30 of this flange 30
A is sandwiched by an upper cylindrical sleeve 32 and a lower cylindrical sleeve 34 which are detachably provided. The upper cylindrical sleeve 32 is attached to the outer peripheral portion 12 of the orbiting scroll 4 by bolts 36 and nuts 38.

Further, the lower end of the lower cylindrical sleeve 34 is engaged with a step portion 4a provided on the outer circumference of the orbiting scroll 4. To adjust the length L of the bellows 11, first loosen the bolt 36 and the nut 38 and remove the upper sleeve 32, the flange 30, and the lower sleeve 34.
Then, the upper sleeve 32 is replaced with one having a different dimension l1, and the lower sleeve 34 is also replaced with another having a different dimension l2. (Here, if the height dimension of the sleeve 30 is l3, the dimensions l3 and l1 + l2 + l3 are set to constant numerical values, so the value of l1 + l2 must always be a constant value.) The dimension of the lower cylindrical sleeve 34 If l2 changes, the height direction position of the flange 30 also changes, and as a result, the length L of the bellows 11 is adjusted. As a result, the rigidity of the bellows 11 is adjusted within an appropriate range.

[Effects of the Invention] As described above, the present invention has the following excellent effects.

(I) It is sufficient to prepare an appropriate number of upper cylindrical sleeves and lower cylindrical sleeves having different sizes, and the bellows having different lengths can be easily replaced.

(Ii) Therefore, it is possible to easily adapt to different kinds of fluids and maintain a smooth orbiting motion of the orbiting scroll.

(Iii) As a result, it is possible to provide an oil-free scroll fluid device which is adaptable and versatile and in which oil and oil shift do not enter the suction chamber and the compression chamber.

[Brief description of drawings]

FIG. 1 is a sectional front view showing an embodiment of the oil-free scroll fluid device of the present invention, and FIG. 2 is a sectional front view showing a conventional scroll fluid device. DESCRIPTION OF SYMBOLS 1 ... Scroll fluid device, 2 ... Frame, 3 ... Fixed scroll, 4 ... Orbiting scroll, 4a ... Step part, 11 ... Bellows, 11A ... Upper end of bellows, 11B ... Lower end of bellows,
12 ... Orbiting scroll outer peripheral surface, 30 ... Flange, 30a ... Flange cylindrical portion, 32 ... Upper cylindrical sleeve, 34 ... Lower cylindrical sleeve, 36 ... Upper cylindrical sleeve bolt, 38 ... Upper cylindrical sleeve nut

Claims (1)

[Scope of utility model registration request] 1. An oil-free compressor that compresses, expands, and sucks fluid by relative motion between an orbiting scroll and a fixed scroll.
In the scroll fluid device, a bellows having an upper end abutting on a flange extending radially outward from the orbiting scroll and a lower end detachably attached to a frame is provided, and a cylindrical portion having the flange is detachably attached to the orbiting scroll. It is sandwiched between an upper cylindrical sleeve and a lower cylindrical sleeve, the upper cylindrical sleeve is attached to the outer peripheral portion of the orbiting scroll by a bolt nut, and the lower end of the lower cylindrical sleeve is engaged with a step portion of the outer peripheral of the orbiting scroll. In the cylindrical portion of the flange, the total length of the upper cylindrical sleeve and the lower cylindrical sleeve is the same, but different lengths are prepared for the upper cylindrical sleeve and the lower cylindrical sleeve. Oil-free scroll fluid device.