JP4623699B2 - Twin scroll fluid machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a twin-type scroll fluid machine that compresses, expands, and pumps fluid, and more particularly to a twin-type scroll fluid machine that includes an orbiting scroll rotation prevention mechanism.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there are known twin scroll fluid machines in which scroll wraps are provided on both sides of an orbiting scroll end plate, and fixed scrolls having scroll wraps fitted to the scroll wrap are respectively disposed on both sides of the orbiting scroll end plate. is there. In addition, since such a scroll fluid machine is configured to obtain a predetermined compression ratio on both sides of the orbiting scroll end plate, the scroll end plate can be compared with a single-type scroll fluid machine that obtains a predetermined compression ratio only on one side. It was possible to provide a scroll fluid machine that can be configured to have a small diameter while suppressing the spread in the radial direction, and that has improved accuracy by suppressing distortion at the outer peripheral portion of the scroll end plate.
[0003]
[Problems to be solved by the invention]
Based on such known facts, the inventor studied a twin scroll fluid machine as shown in FIG. 5 at the time of development. In such a twin-type scroll fluid machine, the fluid of the pressure P1 taken into the front-stage compression portion 31 from the first suction port 8 of the suction member 12 of the fixed scroll 2A is compressed by the rotation of the main shaft 6, and the front-stage compressed fluid is the first discharge fluid. The fluid discharged from the outlet 7 to the pipe 9 at the pressure P2 and taken into the rear compression section 32 from the second suction port 18 at the pressure P2 is further compressed, and the compressed fluid at the pressure P3 is supplied from the second discharge port 17 to the pipe 13. Discharged. Here, the pressure has a relationship of P3>P2> P1.
[0004]
At the beginning of the turning drive of the orbiting scroll 101, the compressed fluid having the pressure P <b> 2 compressed by the sealed space formed by the orbiting scroll wrap and the fixed scroll wrap of the front-stage compression unit 31 enters the sealed space S <b> 1 of the rear-stage compression unit 32. The intake fluid having the pressure P <b> 1 exists in the sealed space T <b> 1 of the upstream compression unit 31. However, there is no compressed fluid in the sealed spaces S2, S3, S4 from the outer peripheral side of the rear-stage compression unit 32 to the second discharge port 17 on the center side.
[0005]
Since the pressures in the sealed spaces S1 and T1 are in a relationship of P2> P1, the pressure exerted on the orbiting scroll wraps 16 and 15 is non-uniform, and therefore, the non-uniform moment load is applied to the orbiting scroll 101, resulting in eccentricity. As a result, the durability is lowered.
[0006]
Further, as shown in FIG. 4A, an eccentric pin 121 is rotatably supported on the fixed scroll on the front compression unit 31 side, and the eccentric rotating shaft 103 is fitted to the orbiting scroll 101 in a cantilever manner. Therefore, during the revolution driving of the orbiting scroll 101, the rotation of the main shaft 6 causes the orbiting scroll 101 to oscillate on the outer peripheral side, resulting in the eccentric rotating shaft 103 being twisted and the durability being lowered. .
[0007]
Further, if the eccentric rotation shaft 103 is twisted to generate abnormal noise or the eccentric rotation shaft 103 is inclined, the contact amount between the wraps increases, the contact resistance increases, and a drive source having a large driving force is required. In addition, the amount of contact between the wraps fluctuates to cause surface treatment layer peeling, wrap burning, and fretting phenomena on the wrap surface, reducing the air density of the sealed space formed by the wraps, and As a result, durability is lowered.
[0008]
Therefore, as shown in FIG. 4B, the end portion of the eccentric rotating shaft 103 is formed on the inner peripheral wall surface of the metal ring 120 provided on the fixed scroll with the free end side, that is, the left side of the eccentric rotating shaft 103 lengthened. It is noticed that the eccentric rotation shaft 103 can be prevented from being twisted by making the crankshaft for preventing rotation by both of the fixed scrolls by bringing them into sliding contact with each other.
[0009]
In view of the circumstances described above, an object of the present invention is to provide a twin-type scroll fluid machine that reduces the non-uniform load on the rotation prevention crankshaft of the rotation prevention mechanism and improves the reliability.
Another object of the present invention is to provide a twin-type scroll fluid in which the non-uniform load on the rotation prevention crankshaft of the anti-rotation mechanism is reduced, the fretting phenomenon occurring on the wall surface of the wrap is prevented, and the durability of the scroll mechanism is improved. Is to provide a machine.
Another object of the present invention is to provide a twin scroll fluid machine having an absorption mechanism that absorbs a turning error in driving the turning scroll mechanism.
[0010]
[Means for Solving the Problems]
The present invention is a twin-type scroll fluid machine in which fixed scrolls are provided on both sides of an orbiting scroll end plate.
One shaft side of the rotation prevention crankshaft supported by the orbiting scroll is supported by a roller bearing provided on one fixed scroll side,
The other axis side is provided on the other fixed scroll side, and is supported by a circular inner peripheral wall having the same inner diameter as the radius of the orbiting scroll plus the axis radius of the other axis side .
[0011]
According to the present invention, one axis side of the rotation prevention crankshaft supported by the orbiting scroll, that is, the eccentric side is supported by the roller bearing provided on one fixed scroll side.
Then, the other shaft side of the shaft that is not eccentric is supported on a circular inner peripheral wall that is provided on the other fixed scroll side and has the same inner diameter as the turning radius of the orbiting scroll plus the shaft radius of the other shaft side. Yes.
[0012]
Therefore, the other side shaft of the rotation preventing crankshaft is slidably slidably contacted with the circular inner peripheral wall functioning as a turning restricting portion provided on the other fixed scroll, By using both ends with a fixed scroll, it is possible to prevent twisting of the crankshaft for preventing rotation.
[0013]
The present invention prevents the rotation prevention crankshaft from being twisted, thereby reducing the uneven load on the rotation prevention crankshaft of the rotation prevention mechanism, preventing the fretting phenomenon occurring on the lap wall surface, and improving the reliability. In addition, it is possible to provide a twin scroll fluid machine in which the durability of the scroll mechanism is improved.
[0014]
Further, according to the present invention, since the circular inner peripheral wall is formed as a recessed portion, the sliding contact portion of the shaft end on the other shaft side of the rotation preventing crankshaft may be inserted into the circular wall surface for sliding contact. Therefore, it is not necessary to position and can be assembled easily.
[0015]
Further, the circular inner peripheral wall can be formed by a perfect circular recess or a ring-shaped groove. In the round recess, the other side shaft of the rotation preventing crankshaft may be slidably contacted with the round inner circumferential wall, and the other side shaft of the rotation preventing crankshaft may be fitted in the groove in the ring circular groove. .
[0016]
The wall surface of the circular inner peripheral wall is preferably formed of a low friction member. Examples of the low friction member include tungsten disulfide WS2, boron nitride BN, etc., which are formed with these lubricants, and these are used as solid lubricants attached to the lower member by vapor deposition, sputtering, or the like. Can do.
[0017]
It is also an effective means of the present invention that the receiving portion forming the circular inner peripheral wall is formed as a member separate from the fixed scroll, and is mounted on the fixed scroll on the outer peripheral side of the receiving portion via the turning fluctuation absorbing member. is there. According to such a technical means, it is possible to provide a twin scroll fluid machine that can absorb a turning error in driving the orbiting scroll mechanism and has improved reliability and durability.
[0018]
Moreover, the circular shaft portion provided at the center in a circular inner circumferential wall concentric with the revolving ring-shaped space of the self-rotation preventing crankshaft between the outer periphery and the circular inner peripheral wall of the circular shaft portion formed, the It is also an effective means of the present invention that the shaft end portion on the other shaft side of the rotation preventing crankshaft is fitted into the swivel ring-shaped space .
[0019]
According to this technical means, a space between the circular inner peripheral wall and the circular shaft portion is formed in a swirling ring-shaped space, and the shaft end portion of the other side shaft of the rotation preventing crankshaft is inserted into the swirling ring-shaped space to slide. Since they only need to be in contact with each other, it is not necessary to position them and can be easily assembled.
In addition, since the circular shaft portion receives the shaft end portion of the other side shaft of the rotation preventing crankshaft, the circular shaft portion swings when the orbiting scroll is driven to revolve and bounces against the circular wall surface to damage the wall surface. This prevents fretting and improves reliability.
[0020]
Also, one side of the orbiting scroll is a front-stage compression part that compresses fluid introduced from outside the main body, and the other side is a rear-stage compression part that introduces compressed fluid compressed by the front-stage compression part and further compresses it. If configured, a non-uniform load is applied to the orbiting scroll lap and a non-uniform moment load is applied to the orbiting scroll, but the anti-rotation crankshaft is designed to prevent rotation by being supported by both fixed scrolls. The crankshaft can be prevented from being twisted.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Not too much.
[0022]
FIG. 1 is a cross-sectional view of a scroll fluid machine according to an embodiment of the present invention. In the figure, a twin-type scroll compressor 30 includes a orbiting scroll 1 supported by a central crank portion 5a of a main shaft 6 and having orbiting wraps 15 and 16 formed on both sides in the axial direction, and a fixed wrap fitted to each lap. A pair of fixed scrolls 2A and 2B are formed, and three rotation prevention mechanisms 25 are provided on the outer peripheral side of the scroll so as to be shifted in the circumferential direction by 120 °.
[0023]
The fixed scrolls 2A and 2B have their peripheral walls functioning as a lid-shaped casing in contact with each other via the static seal member 27 and the intermediate ring 14, and are fixed to the mounting holes 26 using bolts and nuts (not shown). 4, a main shaft 6 is inserted through a bearing 5, and the main shaft 6 is rotatably supported by two-point support on both sides in the axial direction. In addition, the air holes 33 provided in the intermediate ring 14 are provided at predetermined intervals on the outer periphery to reduce the resistance when the orbiting scroll 1 revolves by communicating the outer periphery of the orbiting scroll 1 with the outside.
[0024]
Around the bearing 5, spiral fixed wraps 10 and 11 are arranged in a symmetrical position so as to face each other, and a suction member 12 communicating with the first suction port 8 is arranged on the outer peripheral side of the fixed scroll 2A. A pipe 9 communicating with the first discharge port 7 is provided on the inner peripheral edge side.
[0025]
Further, a second suction port 18 that communicates with a pipe 9 that communicates with the first discharge port 7 is disposed on the outer peripheral side of the fixed scroll 2B, and a pipe that communicates with the second discharge port 17 on the inner peripheral side. 13 is disposed.
[0026]
Further, a groove is provided at the upper end of the wraps 10 and 11 of the fixed scrolls 2A and 2B, and a chip seal 28 having a self-lubricating property such as a fluorine-based resin is fitted into the groove.
[0027]
On the other hand, the orbiting scroll 1 is provided with orbiting wraps 15 and 16 on both sides in the axial direction. The orbiting scroll 1 can be fitted to the fixed wraps 10 and 11, and the peripheral part thereof has three positions every 120 °. A hole 1a is opened, and the eccentric rotation shaft 3 of the rotation prevention mechanism 25 is pivotally supported in the hole 1a, and one side of the eccentric rotation shaft 3 is inserted into the concave portion 2Ba of the fixed scroll 2B and is formed on the circumferential wall of the concave portion 2Ba. A pin 21 provided on the other side via an eccentric plate 19 and eccentric with the eccentric rotary shaft 3 is rotatably fitted in the hole 2Aa of the fixed scroll 2A.
[0028]
Further, a groove is provided at the upper end of the swirl wraps 15 and 16, and a chip seal 28 having a self-lubricating property such as a fluorine resin is fitted into the groove.
These orbiting scroll wraps 15 and 16 are arranged so that the fixed scroll wraps 10 and 11 face each other.
A dust seal 48 for preventing dust from entering from the outside is disposed at a position corresponding to the outer peripheral side of the orbiting scroll 1 of the fixed scrolls 2A and 2B.
[0029]
As shown in FIG. 1, the scroll compressor main body 30 configured as described above has the orbiting scroll 1 revolved by the rotation of the main shaft 6 and the rotation of the central crank portion 5 a eccentric from the rotation center of the main shaft 6. The compressed fluid sucked from the first suction port 8 of the fixed scroll 2A of the front-stage compression unit 31 is taken into a sealed space formed by the wrap 15 of the orbiting scroll and the wrap 10 of the fixed scroll.
[0030]
The compressed fluid taken into the sealed space is compressed by the sealed space whose volume is sequentially reduced, discharged from the first discharge port 7, passes through the pipe 9, and is fixed from the second suction port 18 of the rear-stage compression unit 32 to the fixed scroll 2 </ b> B. Is taken into the enclosed space.
[0031]
The compressed fluid taken into the sealed space is compressed by the sealed space whose volume is sequentially reduced, discharged from the second discharge port 17, and stored in a compressed fluid storage tank (not shown) through the pipe 13.
[0032]
FIG. 2 is a detailed view showing the first embodiment of the rotation prevention mechanism. In the figure, holes 1a are formed at three positions every 120 ° in the peripheral portion of the orbiting scroll 1, and the eccentric rotating shaft 3 of the rotation preventing mechanism 25 is pivotally supported via a bearing 22 in the holes 1a. .
On one side of the eccentric rotary shaft 3, a metal ring 20 is provided in the recess 2Ba of the fixed scroll 2B via an O-ring 29, and the metal ring 20 has an orbiting radius of the orbiting scroll . It has a circular inner peripheral wall 2Bb having the same inner diameter as the radius of the one side plus the axial radius, and one side of the eccentric rotating shaft 3 is inserted into the metal ring 20 and arranged in contact with the inner peripheral wall 2Bb of the metal ring 20. On the other side, a pin 21 provided eccentrically with respect to the eccentric rotary shaft 3 via an eccentric plate 19 is rotatably fitted in a hole 2Aa of the fixed scroll 2A via a roller bearing 23.
[0033]
In the present embodiment, seal members that prevent leakage of grease are arranged on both sides to constitute the roller bearing 23, but this is not necessarily limited to a bearing that rotates by grease lubrication. A solid lubricating bearing may be used.
[0034]
According to the present embodiment, since the O-ring 29 functioning as a swing fluctuation absorbing member is interposed between the metal ring 20 functioning as the swing restricting portion and the fixed scroll 2B, the swing error in driving the swing scroll mechanism. It is possible to provide a twin-scroll fluid machine that can absorb the turbulence, has a smooth turning motion, and has improved reliability and durability.
[0035]
The turning restricting portion is formed as a circular recess having a circular wall surface, and the shaft end portion of the other-side shaft of the rotation preventing crankshaft is in sliding contact with the circular wall surface. Therefore, since the turning restricting portion is formed as a concave portion having a circular wall surface, the sliding contact portion of the shaft end of the rotation preventing crankshaft may be inserted into the circular wall surface to be in sliding contact. It can be assembled easily.
[0036]
FIG. 3 is a detailed view showing a second embodiment of the rotation prevention mechanism. The difference from the first embodiment is that the metal ring 20 is used in the first embodiment, whereas the closed bottom is provided on one side of the ring-shaped circular wall 24b made of metal. The turning restricting portion 24 is configured by providing a convex portion 24a having a circular outer periphery at the central portion of the closed bottom 24c.
[0037]
Therefore, the turning restricting portion is provided with a concave portion having a circular wall surface and a circular shaft portion at a central portion concentric with the concave portion, and is formed in a ring circular groove portion, and the shaft end of the other side shaft of the rotation preventing crankshaft Since the portion is fitted in a swirl ring-shaped space between the outer periphery of the circular shaft portion and the circular wall surface, the sliding contact portion of the shaft end of the rotation preventing crankshaft is inserted into the circular wall surface and slid. Since they only need to be in contact with each other, it is not necessary to position them and can be easily assembled.
Further, since the circular convex portion receives the shaft end portion of the other side shaft of the rotation preventing crankshaft, the circular convex portion oscillates when the orbiting scroll revolves and bounces against the circular wall surface to damage the wall surface. This prevents fretting and improves reliability.
[0038]
Also in the present embodiment, an O-ring 29 functioning as a swing fluctuation absorbing member is interposed between the metal ring 20 functioning as a swing restricting portion and the fixed scroll 2B. It is possible to provide a twin scroll fluid machine that can absorb the turning error, smooth the turning motion, and improve the reliability and durability.
[0039]
It is desirable that both the metal ring 20 and the turning restricting portion 24 are constituted by a low friction member. Examples of the low friction member include tungsten disulfide WS ₂ , boron nitride BN, etc., which are formed with these lubricants, or are used as solid lubricants attached to the lower member by vapor deposition, sputtering, or the like. be able to.
[0040]
【The invention's effect】
As described above, according to the present invention, since the rotation prevention crankshaft is prevented from being twisted, the uneven load on the rotation prevention crankshaft of the rotation prevention mechanism is reduced and the fretting phenomenon generated on the lap wall surface is prevented. In addition, it is possible to provide a twin scroll fluid machine with improved reliability and improved durability of the scroll mechanism.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a scroll fluid machine according to a first embodiment of the present invention.
FIG. 2 is a detailed view 1 of a part A in FIG. 1;
FIG. 3 is a detailed view 2 of part A in FIG. 1;
FIG. 4 is a diagram for explaining a comparison between the present embodiment and a conventional example.
FIG. 5 is a diagram for explaining a study example at the time of development.
[Explanation of symbols]
1 orbiting scroll 2 fixed scroll (2A, 2B)
2Bb Circular inner peripheral wall 20 Metal ring 25 Anti-rotation mechanism (anti-rotation crankshaft)
31 Pre-compression unit 32 Sub-compression unit

Claims (6)

In the twin scroll fluid machine in which fixed scrolls are provided on both sides of the orbiting scroll end plate,
One axis side of the rotation preventing crankshaft supported by the orbiting scroll is supported by a roller bearing provided on one fixed scroll side,
A twin scroll fluid characterized in that the other shaft side is provided on the other fixed scroll side and is supported by a circular inner peripheral wall having the same inner diameter as the turning radius of the orbiting scroll plus the axis radius of the other shaft side. machine.   The twin scroll fluid machine according to claim 1, wherein the circular inner peripheral wall is a perfect circular recess or a ring circular groove.   The twin scroll fluid machine according to claim 2, wherein a wall surface of the circular inner peripheral wall is formed of a low friction member.   The receiving portion forming the circular inner peripheral wall is formed of a member different from the fixed scroll, and is attached to the fixed scroll on the outer peripheral side of the receiving portion via a turning fluctuation absorbing member. Twin scroll fluid machine. A circular shaft portion is provided in the central portion concentrically with the circular inner peripheral wall, and a rotation ring-shaped space of the rotation preventing crankshaft is formed between the outer periphery of the circular shaft portion and the circular inner peripheral wall, thereby preventing the rotation. 2. The twin scroll fluid machine according to claim 1, wherein a shaft end portion on the other shaft side of the crankshaft for use is fitted in the orbiting ring-shaped space .   One side of the orbiting scroll is configured as a pre-stage compression unit that compresses the fluid introduced from the outside of the main body, and the other side is configured as a rear-stage compression unit that introduces the compressed fluid compressed by the pre-stage compression unit and further compresses it. The twin-type scroll fluid machine according to claim 1.

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