JPS5830403A - Scroll fluid machine - Google Patents

Abstract

PURPOSE:To reduce stress caused in a pin, by supporting the pin of a rotation preventive mechanism part in a scroll fluid machine to both sides of upper and lower frames. CONSTITUTION:A through hole 8 is provided to the side part of a turning scroll 2, and a rotation preventive disc 7 of a scroll fluid machine is provided in the through hole 8 and eccentrically supported by a pin 6, then the pin 6 is fitted into holes provided in upper and lower frames 1, 5. The pin 6 is supported with its both sides, permitting the supporting stronger as compared with cantilever supporting.

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the scroll compressor for gas can be used in refrigeration compressors, air conditioning compressors, air compressors, and various gas compression rams for plants, and the orbiting scroll member can be reversed. If so, it relates to a scroll fluid machine that can be used as a gas expander.

Crawl wrap, 1b is a fixed scroll center, 2a is an orbiting scroll wrap, 211; I is an orbiting scroll center, and 3 is a discharge boat. 1. In FIG. 1(a), each fixed and rotating scroll wrap 1a and 2
It has an aperture involute or a shape close to an involute, and the combination thereof forms a sealed fluid pocket 4 (for example, the dotted part in the figure). As the orbiting scroll center 2b rotates around the fixed scroll center 1b with a rotation radius e, the fluid pocket 4 moves toward the center and reduces its volume as shown in FIGS. , fluid is discharged from the discharge boat 3 to perform a fluid compression action. Further, if the orbiting scroll is rotated in a direction opposite to the above-mentioned rotation direction, a fluid expansion effect is performed. At this time, the orbiting scroll member 2 (see FIG. 2) must not rotate regardless of the direction of rotation, and for this reason, a rotation prevention mechanism is provided. The rotation prevention mechanism is the second
As shown in the figure, there are a plurality of pins 6 protrudingly attached to the frame 5, a ring 7 with an eccentric hole, and a plurality of round holes 8 provided in the orbiting scroll member 2 which accommodates the ring and engages with a slight clearance. It is constructed by providing two pieces. FIG. 3 is a sectional view taken along the If-If line in FIG.
The principle of the anti-rotation mechanism is shown. In Fig. 3, 60 is the center axis of the pin 6, 7C is the center axis of the ring 7, 9ac and 9b
c is the center 1ξ11 of the main 1141198 of the crankshaft 9119 and the crank pin 9b. center f
The distance between 6C and 7C is the eccentricity h[ε of the crankshaft 9, that is, the distance 1 between the central axes gac and 9bc.
It is equal to ilff, and the distance between 6C and 91]C is 7
C and gac pressures are equal. Therefore, the points of intersection of each of the central axes 5C, 7c, gac, and gac with a plane orthogonal thereto form various points of a parallelogram, and as a result, when the crank bin 9b rotates with a radius of rotation ε and 'fc', The pin 6 similarly rotates around the central axis 7C with a radius ε and at the same rotational speed as the crank bin 9b. At this time, the orbiting scroll part 2 coupled to the pin 6 performs an orbiting motion with a radius ε without rotating.

Next, the conventional technology for scroll fluid machines will be explained in the second section.
This will be explained using figures. The second figure is a partial plan view of a conventional scroll compressor. First, the basic structure and operation of the conventional scroll compressor will be explained using this figure. When the crankshaft 9 is driven and rotates, the crank bin 9b rotates with a radius ε, and the orbiting scroll member 2 rotates via the orbiting scroll bearing 2C. Rotation of the orbiting scroll member 2 is prevented by a pin 6 attached to the frame 5, a ring 7 with an eccentric hole, and a round hole 8 provided in the orbiting scroll member 2.
This is done by an anti-rotation mechanism consisting of. Thus, due to the orbiting movement of the orbiting scroll member 2, fluid is drawn in from the suction boat 10, confined in the fluid pocket 4, compressed and discharged from the discharge boat 3. If the Lancry plate 9 is reversed, the fluid is sucked in from the discharge boat 3, expanded and discharged from the suction boat 10, contrary to the above. This conventional structure has the following drawbacks. That is, 1) Since the rotational torque of the orbiting scroll member is applied to the rotation prevention mechanism, a load is applied to the pin via the ring, but this load is received only at one end of the pin. Therefore, the stress generated in the pin becomes large, which tends to cause problems in terms of strength. In this case, if the diameter of the pin is increased, the stress will be lowered, but as the diameter of the pin increases, the diameter of the ring must be increased, which causes more turning and fi! , the dimensions of the constant scroll member etc. also need to be increased. Therefore, the entire machine becomes larger, resulting in increased weight and price. 2) A stand for mounting the pin by engaging it with the frame, and the pin is supported at one end, so this support part is used for one end. It is prone to stiffness and therefore seizure or abnormal wear.

The present invention was made considering the above ML to be 9≦1, and the scroll is equipped with an anti-rotation mechanism that can increase the strength of the pin without increasing the size of the machine, and prevents uneven contact. The objective is to provide fluid machinery.

In order to achieve the above object, the present invention provides an anti-rotation machine having a structure in which a pin is supported at both ends. In addition, the stress generated on the pin can be reduced, and uneven contact between the splintered pin and the frame can be prevented.

Hereinafter, actual Mj examples of the present invention will be described using Nos. 4 to 6.
1. Clarify.

FIG. 4 is a sectional view of essential parts of an embodiment of the scroll fluid machine according to the present invention, in which 1 is a fixed scroll member, 2d is an orbiting scroll member, 3 is a discharge port, 4 is a fluid pocket, and 5
1 is a frame, 6 pins, 7 are rings, 8 are round holes, 9 are crankshafts, 9a is a main shaft, 9b is a crank bin, 10 is a suction boat, 11 is a small hole, and 12 are eccentric holes. The anti-rotation mechanism is composed of a pin 6, a ring 7, a round hole 8, and a small hole 11, and a plurality of these are provided. The ring 7 engages with a circular hole 8 provided in the orbiting scroll member 2. The distance between the center axes of the pin 6 and the ring 7 is approximately equal to the eccentricity of the crankshaft 9, that is, the distance ε between the center axes of the main 11+9a and the crank pin 9b. When the crankshaft 9 is driven and rotated, the orbiting scroll member rotates and compresses or expands the liquid. At this time, due to the rotational torque generated in the orbiting scroll member 2, the pin 6
A load]i is applied to the pin 6, but since this load is shared and received by both ends of the pin 6, the stress generated in the pin 6 can be reduced, and therefore the flexibility of the pin can be increased. Since the groove and the pin 6 are supported at both ends, uneven contact/stiffness with the small hole 11 will not occur, and therefore seizure or abnormal wear will not occur, making it possible to realize a highly reliable anti-rotation mechanism.

FIG. 5 is a sectional view of a main part of another embodiment of a scroll 15iff body machine according to the present invention, and the structure is the same as that of FIG. 4 except for the rotation prevention mechanism. The width part of the anti-rotation machine is different from the embodiment shown in FIG. 4 in that the pin 6 and the ring 7 are integrated.

FIG. 6 is a side view of the main part 1 of another embodiment of the scroll fluid machine according to the present invention. Rotation 1υ stopper # (The structure is the same as in Fig. 4 except for part 11. The rotation prevention mechanism part is a circular hole 8 provided in the fixed and orbiting scroll parts '4'AI and 2, and a small hole in this round hole. The center of the pin 6 and the ring 7 consists of a ring 7 that fits with a slight gap, and a cylindrical pin 6 that penetrates the ring 7 and the orbiting scroll member 2 and fits with each with a slight gap. ) Il
By making the distance between + and approximately equal to the eccentricity ε of the crankshaft, it is possible to prevent the rotation of the rotating shaft (9) and roll member.

The embodiments shown in FIGS. 5 and 6 also make it possible to realize a scroll fluid machine with a highly reliable anti-rotation mechanism for the same reason as explained in the embodiment shown in FIG.

As explained above, according to the present invention, the pin, which is a component of the anti-rotation mechanism, is structured to be supported at both ends, so that the stress generated in the pin can be reduced, and the pedestal portion of the pin Since uneven contact can be prevented, a scroll fluid machine equipped with a highly reliable anti-rotation mechanism can be realized.

A diagram explaining the principle of a fluid machine. Figure 2 is a sectional view of the main part of a conventional scroll fluid machine. Figure 3 is a sectional view taken along the line ll-1 in Figure 2, and is a diagram explaining the principle of the anti-rotation mechanism. Figures 4 to 6 The figure is a sectional view of a main part of a scroll fluid machine showing an embodiment of the present invention.

6...pin, 7...ring, 8...round hole, 11...
...Small hole.

Agent, patent attorney, easy-to-understand (10) '%/figure (long) (l=)(c) 2 years Figure 2

Claims (1)

[Claims] 1. An orbiting scroll member and a fixed scroll member each having a wrap formed in an involute or a curved shape close to a d-involute are joined so that the wraps of the two are engaged with each other, and the fixed scroll member is attached to the fixed scroll member. In this scroll fluid machine, a fluid suction port and a discharge boat are provided, and an orbiting scroll layer is interposed between a frame and a fixed scroll member. Between opposing end faces, the distance between the center axes of the bin and ring is the orbiting radius of the scroll member )! An anti-rotation mechanism is constructed by interposing a plurality of equal pieces (2. Prevent the rotation of the orbiting scroll member, maintain airtightness in the radial direction of both scroll wraps, and drive the orbiting scroll member with a crank mechanism. 2. A plurality of cylindrical small holes are provided perpendicularly to the end faces of the fixed scroll member and the frame, each having a diameter of 11+, and a slight gap is formed between the small holes. A cylindrical ring with an eccentric hole is provided, and a cylindrical ring with an eccentric hole is fitted with the bottle with a slight clearance. Tighten the bottle and the center of the round hole 11
Patent 8, characterized in that the anti-rotation mechanism is constructed by making the distance between 11 and 11 approximately equal to the radius of rotation of the orbiting scroll member.
The scroll fluid machine according to item 1, wherein the range of N is desired. 3. The scroll fluid machine according to claim 2, characterized in that the bottle and the ring are integrated. 4. A plurality of cylindrical round holes are provided on opposing end faces of the fixed scroll member and the frame so as to be perpendicular to and coaxial with the end faces, and a cylindrical ring is fitted into the round holes with a slight gap. A small hole is provided in the ring and the orbiting scroll member, and a cylindrical pin that engages with each of these small holes with a small gap is provided, and the distance between the center of the pin and the ring +1q11 is approximately equal to the orbiting radius of the orbiting scroll member. Scroll fluid machine according to claim 1, characterized in that the anti-rotation mechanism is constructed in the same manner as an lPW feature.