JPS60198301A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To prevent leakage of fluid through a gas provided occasioned by primary wear of spiral bodies, by a method wherein moving and stationary scroll members are assembled in a manner that the phases thereof are displaced in the swirl direction of the moving scroll in response to the primary wear of the spiral bodies. CONSTITUTION:A positioning hole 208a, bored in a stationary scroll member 20, is provided in a position which is displaced by an angle epsilonrod, determined by an equality of epsilon=(1/1,000)(a/b), wherein amu is primary wear of the flank surfaces of spiral bodies 202 and 212, respectively, and (b)mm. is the radius of the reference circle of the involute curve of each flank surface, in the rotation direction of a main shaft from a positioning hole 218 bored in a moving scroll member 21. Positioning bars are respectively inserted into the positioning holes 208a and 218, and the stationary and moving scroll members 20 and 21 are assembled in a way that the phases thereof are displaced in the swirl direction of the moving scroll member 21. This, even if the phase of the moving scroll member 21 is displaced, prevents formation of a gap between the spiral bodies 202 and 212.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scroll type fluid machine that can be used as a compressor, an expander, a motor, a pump, etc.

It consists of a cup-shaped portion 12 and a front end plate 11 that closes this opening, and passes through a fixing hole 123 drilled in the opening edge of the cup-shaped portion 12 and a fixing hole 116 bored in the periphery of the front end plate 110. Fixing bolt 17
It has been concluded by A sleeve portion 15 projecting forward is fixed to the end surface of the front end plate 11, and a main shaft 14 passing through the sleeve portion 15 and the center portion of the front end plate 11 has a ball earring 16.13.
It is rotatably supported through. Inside the housing 10 are a fixed scroll member 20 and a movable scroll member 2.
1, a drive mechanism for a movable scroll member 21, and a rotation prevention mechanism 22, which will be described in detail later, are built in. The fixed scroll member 20 includes a side plate 201, a spiral body 202 planted on one side thereof, and a leg 203 provided on the side opposite to the spiral body 202, and the leg 203 is connected to the cup-shaped portion 12.
It is fixed on the inner wall of the bottom part 121 by tightening a bolt passing through the bottom part 121 of the cup-shaped part 12 from the outside, and the outer peripheral surface of the side plate 201 and the inner wall surface of the cup-shaped part 12 are sealed with an O-ring or the like. By doing so, the space within the housing 10 is partitioned into a suction chamber 25 and a discharge chamber 26. Furthermore, a scroll member 20 is provided at the center of the side plate 201.
A communication hole (illustrated path) is provided to communicate the discharge chamber 26 with the sealed space 23 formed between the discharge chamber 21 and the discharge chamber 26 .

The movable scroll member 21 is composed of a side plate 211 and a dowel roll 212 planted on one side of the side plate 211. The movable scroll member 21 is meshed with the spiral body 212 of the fixed scroll member 20 so that the spiral body 202 of the fixed scroll member 20 has an angular deviation of 180°. Then, spiral body 2
02 and 212 are in contact at multiple points and are in the closing position, i.e.
The outer ends of the spiral bodies 202 and 212 are on the opposite side of the spiral body 212.
, 202, point A as shown in FIG.

Contact at B, G, and D. Line connecting contact points A and B or C
On the axis Y passing through the center of the orbital movement of the movable scroll member 21, that is, the axis of the main shaft 14 or the center O8 of the fixed scroll member 20, at right angles to the line connecting the fixed scroll member 20 and the movable scroll member 21. Positioning holes 208 and 218 are bored, and a linen thread 209 is formed in a part of the positioning hole 208 as shown in FIG.
The cup-shaped portion 1 is located on the same axis as the positioning hole 208.
A through hole 122 is bored in the bottom part 121 of 2.

The rotation prevention mechanism 22 of the movable scroll member 21 is connected to the front end plate 11 as shown in FIGS. 1 and 2.
a ring-shaped fixed race 221 embedded and fixed on the inner surface of the
A fixing ring 222 that covers this fixed race 221 and is fixed to the inner surface of the front end plate 11 , a ring-shaped fixed race 214 embedded and fixed to the outer surface of the side plate 211 of the movable scroll member 21 , and this fixed race 214
A movable ring 215- which is fixed in contact with the outer surface of the side plate 211 while covering the same, and a fixed ring 222-. a plurality of pockets 222α that are bored in the movable ring 215 and penetrate in the axial direction;
215a, each consisting of a ball 224 fitted into each of the balls 215a.

When the movable scroll member 21 is driven clockwise in FIG. 2, the movable ring 215 also moves in a circular orbit with its center drawing a circle with a radius Fjor. Due to the deviation between the point of action of the reaction force of the compressed fluid and the point of action of the driving force, a rotational force or moment is generated in the clockwise direction in the figure.
attempts to rotate clockwise around the center of the movable ring 215.

However, the nine balls 224 in the upper part of the figure are
22 and the edge of the pocket 215α of the movable ring 215, the movable ring 2
15 cannot rotate, thereby preventing the movable scroll member 210 from rotating.

In the illustrated state, the center of the movable ring 215 is located at the far right side in the figure, and the rotation blocking force distribution becomes fC1 to fC5. In this way, the ball 224 at the top of the figure contributes the most, and the further away from it, the smaller the ball 224, and the nine balls 224 at the bottom half of the figure do not serve to prevent rotation. However, the pressure applied in the axial direction of the movable scroll member 21 due to the reaction force of the compressive force is thrust supported by the fixed race 221 via the movable race 214 and all the balls 224.

Next, the drive mechanism of the movable scroll member 21 will be explained. A large diameter portion 141 formed at the inner end of the main shaft 14 is supported by a ball bearing 16. Further, a drive pin (not shown) is provided on the distal end surface of the large diameter portion 141 at a position eccentric from the center thereof so as to protrude in the axial direction. On the other hand, in an annular boss 213 protruding from the side plate 211 of the movable scroll member 21, a bush 27 in the form of a thick disk or short shaft is rotatably supported via a needle bearing 28. The bushing 27 is integrated with this and is a disc-shaped balance weight 27 extending in the radial direction.
1, and has an eccentric hole extending in the axial direction at a position offset from the center Oc of the bushing 27, and the drive pin is fitted into this eccentric hole and rotatably supported via a needle bearing. has been done.

Therefore, when the fluid is compressed by the circular orbital movement of the movable scroll member 210, the reaction force is applied to the spiral body 2.
12 on the movable scroll member 21 in the tangential direction of its circular orbit. This force ultimately acts on the center OC of the bushing 27 as shown by Fd in FIG. By the way, since the bushing 27 is rotatable around the drive pin, it receives the moment of rotation around the center Od of the drive pin due to the force Fa. This moment is Fd・ε2311 when the angle between the direction of force Fd and the line connecting bush center Oc and drive pin center Od is θ as shown in FIG.
It can be expressed as 1θ. As a result, the movable scroll member 21 supported on the bushing 27 receives a moment of rotation around the center Od of the drive pin, which causes the spiral body 212 to be pressed against the spiral body 202. If the force of this pressing is Fp, then Fp・ε2CO3
Since θ=Fa·ε2 Sl[1θ, it is given by Fp =Fd11 tanθ.

That is, when the bush 27 having the eccentric hole and the movable scroll member 21 are driven, a fluid compression reaction seal is ensured.

Furthermore, as mentioned above, the center OC of the bushing 27 is rotatable around the center Od of the drive pin, so for example,
Even if the wall thickness of the spiral coil changes due to dimensional errors in the spiral coils 202 and 212, the distance between oc"os can be changed accordingly. In other words, the 00 point is centered around Od as shown in FIG. It is possible to move, for example, to a point Q c / or Oc" on a circular arc having a radius ε2. As a result, even if there is such a dimensional error, the movable scroll member 21 can smoothly move.

When assembling this scroll compressor, first,
By screwing the bolts 17 into the fixing holes 113 and 123, the fixed scroll member 20 and the movable scroll member 21 are separated.
, and then positioning holes 208 and 218 bored in the fixed scroll member 20 and the movable scroll member 21.
After matching, the positioning rod 18 inserted through the through hole 122 provided in the bottom 121 of the cup-shaped portion 12 is inserted into the positioning hole 208°218. As a result, the movable scroll member 21 has a degree of freedom within a certain angular range around the positioning rod 18. That is, the movable scroll member 21 moves within the range of the amount of play of the bush 27, and the pocket 215α of the movable ring 215 also moves by an angle equal to the operating angle range of the mesh 27. The rotation prevention mechanism 22, which prevents the rotational movement of the movable scroll member 21, always has a gap between the edges of the pockets 215α and 222α of the movable ring 215 and the fixed ring 222 during its operation. In order to determine the correct meshing angle position of both scroll members 20 and 21, the front end plate 11 to which the fixed ring 222 is fixed is rotated in the direction opposite to the rotational direction of the main shaft 14, so that the ball 224 is connected to the fixed ring 222. There is a gap between the edges of the pockets 222α and 215α of the movable ring 215, so that both scroll members 20 and 21 need to be in the correct meshing angle position. The inner diameter of the bolt 17 is larger than the outer diameter of the bolt 17. Therefore, with the bolt 17 inserted into the fixing hole 126 of the cup-shaped portion 12, the front end plate 11 is rotated in the direction opposite to the direction of rotation of the main shaft 140. After this, bolt 1
7 by tightening the front end plate 11.
and the cup-shaped portion 12 are combined and fixed. This determines the correct meshing angular position of both scroll members 20, 21. Note that after the cup-shaped portion 12 and the front end plate 11 are connected, the positioning rod 18
Then, by screwing the bolt 19 passing through the through hole 122 provided in the bottom 121 of the cup-shaped portion 12 into the hemp thread 209 of the positioning hole 208 formed in the fixed scroll member 20, both the positioning holes 208, 218 and the through hole 122 are fixed.

However, the conventional assembly method described above has the following drawbacks. (1) Cup-shaped portion 12 and front end plate 11
(2) align the positioning holes 208 and 218 drilled in both scroll members 20 and 21, and align the positioning holes 208 and 218 with each other; (3) Rotate the front end plate 11 in the direction opposite to the direction of rotation of the main shaft 140 until it stops moving; (4) Insert the positioning rod 18 into the cup-shaped portion 12 and the front end plate 11.
(5) Remove the positioning rod 18 and fasten the cup-shaped portion 12 and the front end plate 11 with the bolts 19.

When the engagement angle of both scroll members 20.21 is set by the above procedure, the turning radius of the circular orbital motion of the movable scroll member 210 is determined by the spiral bodies 202, 212 of both scroll members 20.21 coming into contact with each other due to initial wear. is thick (in this case, even if the drive mechanism of the movable scroll member 21 follows the turning radius, the phase of the movable scroll member 21 around the drive shaft center relative to the fixed scroll member 20 will shift, and both spiral bodies 202, 21
There was a problem in that a gap was formed between the flank surfaces, that is, side surfaces of the compressor, and as a result, gas leaked from this gap, significantly reducing the performance of the compressor.

The present invention was invented to solve the above problems, and its purpose is to eliminate the gap between the flank surfaces of the spiral wound body caused by the initial wear of the flank surfaces. The purpose is to shift the phase of the movable scroll member and the fixed scroll member in the direction of rotation of the movable scroll member in accordance with the initial wear of these spiral bodies. A scroll-type fluid machine characterized by being assembled.

Since the present invention has the above configuration, even if the phases of the movable scroll member and the fixed scroll member are shifted due to initial wear of the spiral body, no gap is created between the flank surfaces of the spiral body, and from this gap. It is possible to prevent fluid leakage and prevent performance deterioration of the scroll type fluid machine.

The present invention will be explained with reference to an embodiment shown in FIG. FIG. 6 is a diagram corresponding to FIG. 4, and the same members as in the conventional one are given the same reference numerals.

Reference numeral 208α denotes a positioning hole drilled in the fixed scroll member 20, and the positioning hole 208α prevents the initial wear of the flank surfaces of each spiral body 202, 212 from αμ, which is expected in advance.
, the angle εrad determined by each hula fluff diplane volute curve
The movable scroll member 21 is provided at a position shifted from the positioning hole 218 bored in the movable scroll member 21 in the rotational direction of the main shaft 14 by the same amount. If α=10~40μ, then b=5 εd
eg = 0.1° to 0.5°. The positioning hole 208α drilled in the fixed scroll member 20 is provided to be shifted by εrad from the positioning hole 218 of the movable scroll member 21 in the rotation direction of the main shaft 14, that is, in the turning direction of the movable scroll member 21, and the positioning holes 208α and 218 are used for positioning. Fixed scroll by inserting rod 18, -
The scroll member 20 and the movable scroll member 21 are assembled with their phases shifted in the rotating direction of the movable scroll member 21. Therefore, even if the phase of the movable scroll member 210 is shifted due to initial wear of the flank surfaces of each spiral wound body 202, 212, no gap is created between the flank surfaces, and therefore, gas leakage does not occur from this gap. Therefore, a scroll compressor with good performance can be obtained.

[Brief explanation of drawings]

Figures 1 to 5 show an example of a conventional scroll compressor, with Figure 1 being a longitudinal sectional view during the assembly process, Figure 2 being a view of the rotation prevention mechanism as seen from the movable ring side, and Figure 3 is a line diagram explaining the pressing force acting on the movable scroll member, Figure 4 is a diagram showing the relative positions of the spiral body of the fixed scroll member, the spiral body of the movable scroll member, and the positioning hole, and Figure 5 is after assembly. FIG. FIG. 6 is a diagram corresponding to FIG. 4 showing one embodiment of the present invention. Movable scroll member...21, spiral body...212
, Fixed scroll member...20.5 Winding body...20
2゜Sub-agent Patent attorney Shige Okamoto 3 people outside of the text 20 Y 3rd and 4th figure

Claims (1)

[Claims] A scroll-type fluid machine characterized in that the movable scroll member and the fixed scroll member are assembled by shifting the phases of the movable scroll member and the fixed scroll member in the rotating direction of the movable scroll member in accordance with the initial wear of these spiral bodies.