JPH01271679A - Method for fixing rotation preventing mechanism of scroll compressor - Google Patents

Abstract

PURPOSE:To prevent the falling off and breakage of spring pins by giving caulking to fix movable and fixed rings to the side plate of a movable scroll member and a front end plate respectively. CONSTITUTION:A movable ring 215' is fitted to a boss 213 formed on the side plate 211 of a movable scroll member 21 by stop fitting and caulking is given from the vicinity of the inside of the movable ring 215' using the boss 213. On the other hand, a fixed ring 222' is fitted to the axially projecting portion 112 of a front end plate 11 which is provided on the outside of the fixed ring by stop fitting and caulking is given from the vicinity of the outside of the fixed ring 222' using the axially projecting portion 112.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method for fixing a rotation prevention mechanism of a scroll compressor.

[Prior art] This type of compressor consists of two scroll members each having a spiral body fixed on two plates, which are overlapped by interlocking with each other with the angles of the spiral bodies being shifted, and one scroll member is fixed. , the other is movable and the movable scroll member moves in a circular orbit, thereby compressing the fluid by moving the fluid pocket formed between both scroll members toward the center and reducing the volume. When the movable scroll member moves in a circular orbit, it is necessary to prevent the movable scroll member from rotating itself.

An example of such a rotation prevention mechanism will be described with reference to FIG. 1, which shows a recently proposed scroll compressor in cross section.

In the figure, the compressor 1 has a compressor housing 10 consisting of a front end plate 11 and a cup-shaped portion 12 installed therein.

The front end plate 11 has a through hole 111 centered on the central axis of the housing 10, and a main shaft 14 is rotatably supported therein via a ball bearing 13. Therefore, the axis of the main shaft 14 is
This coincides with the center axis of 0. The front end plate 11 also has a sleeve portion 15 that surrounds the outer periphery of the main shaft 14 and protrudes forward, and a shaft seal 16 is disposed within the sleeve portion 15. is equipped with an electromagnetic clutch device 17, which transfers rotational movement from an external drive source to a V-belt (not shown).
The rotational motion is transmitted to the pulley 171 of the electromagnetic clutch device 17 via the energizing coil 172, and the transmission of the rotational motion to the main shaft 14 is controlled by controlling the energization of the exciting coil 172. The front end plate 11 is fixed at several locations with bolts or the like so as to close the front end opening of the cup-shaped portion 12, and the joint surfaces thereof are sealed by an O-ring 18. The sleeve portion 15 is also fixed onto the end surface of the front end plate 11 with bolts or the like, and the joint surface is connected to the O-ring 19.
It is sealed by.

A fixed scroll member 20, a movable scroll member 21, a movable scroll member drive mechanism, and a rotation prevention mechanism 22 are disposed within the cup-shaped portion 12 whose opening is closed by the front end plate 11.

Here, the fixed scroll member 20 generally has a side plate 201
And on one side of the center, the distance from the center of the side plate is Ror/2 (
However, Ror refers to the spiral body 202 which is fixed to be eccentric by the circular orbit radius of the movable scroll member, and the leg portion 203 provided on the side plate 201 on the opposite side from the spiral body 202.
The leg portion 203 is fixed onto the inner wall of the bottom portion 121 by a bolt 23 which penetrates the bottom portion 121 of the cup-shaped portion 12 from the outside of the cup-shaped portion 12 and is screwed into the leg portion 203. Furthermore, the side plate 201 of the fixed scroll member 20 fixed within the cup-shaped portion 12 seals between its outer peripheral surface and the inner wall surface of the cup-shaped portion 20 with an O-ring 24, thereby converting the space within the cup-shaped portion 12 into a suction chamber. 25 and discharge chamber 2
It is divided into 6.

Furthermore, a communication hole 204 is provided in the center of the side plate 201 to communicate the sealed space formed between the scroll members with the discharge chamber 26.
is installed.

The movable scroll member 21 is composed of a side plate 211 and a spiral body 212 fixed on one side of the side plate so that its center is offset by a distance for/2 from the center of the side plate. The bodies 202 and 202 are engaged with each other with an angular deviation of 180'. Furthermore, the movable scroll member 21 is connected to a drive mechanism and a rotation prevention mechanism, which will be described later, and revolves around a circular orbit having a radius Ror by the rotation of the main shaft 14, thereby performing the fluid compression operation described above.

Here, the radius Ror of the circular orbit is generally given by (the pitch of the spiral body) - 2X (the wall thickness of the spiral body). Further, the movable scroll member 21 has a spiral body 212 whose spiral center is located at the fixed scroll member 21.
The movable scroll member 21 is disposed at a distance Ror from the center of the spiral of the spiral body 202, and the rotation of the main shaft 14 causes the movable scroll member 21 to revolve on a circular orbit having a radius Ror.

As a result, a line contact is formed between both spiral bodies, and this line contact moves along the surface of the spiral body toward the center, so that the fluid pocket moves toward the center of the spiral body while decreasing its volume.

Therefore, the suction chamber 25 inside the housing 10 is passed from the external fluid circuit through the suction port provided on the outer periphery of the housing 10.
The fluid flowing into the spiral body is taken into the fluid pocket from the outer end of both spiral bodies, and the compressed fluid is sent out from the fluid pocket at the center of both spiral bodies through the communication hole 204 to the discharge chamber 26. From there it will flow out to the external fluid circuit via a discharge port provided on the housing 10.

Next, move the drive mechanism of the movable scroll member to a second location outside of the one shown in FIG.
This will be explained with reference to the figures.

A large diameter portion 141 is formed at the inner end of the main shaft 14 that passes through the through hole 111 of the front end plate 11.
It is supported by a ball bearing 13 arranged at 11. Further, a drive pin 142 is provided on the distal end surface of the large diameter portion 141 at a position eccentric from the center so as to protrude in the axial direction.

On the other hand, an annular boss 213 is formed on the side plate 212 of the movable scroll member 21 on the side opposite to the surface on which the spiral body 212 is fixed. Here, the center of the annular boss 213 is aligned with the center of the side plate 211. Also, the boss 2
A bushing 27 in the form of a thick disk or short shaft is fitted into the bushing 13 and rotatably supported via a needle bearing 28 . The bushing 27 has a disc-shaped balance weight 271 integrally extending in the radial direction, and has an axial hole 272 on the surface facing the large diameter portion 141 of the main shaft 14. The aforementioned drive bottle 142 is fitted into the hole 272 via the needle bearing 29. Therefore, the movable scroll member 21 is rotatably supported on the drive bin 142 (rotation and rotation).

Note that the scroll member 21 is prevented from moving in the rotational direction by a rotation prevention mechanism indicated by 22 in FIG.

Here, this rotation prevention mechanism will be explained with reference to FIG. 3, which is an exploded view, in addition to FIG. 1.

The rotation prevention mechanism 22 includes a boss 2 of the movable scroll member 21.
A ring-shaped fixed race 221 is disposed on the outer circumference of the front end plate 13 near the front end plate 11, and the outer circumferential surface is joined to the inner wall surface of the cup-shaped portion 12. has a fixing ring 222 abutted on the end surface of the ring 221 so as to cover the ring 221;
These are fixed to the front end plate 11 by spring pins 223. On the other hand, on the outer periphery of the boss 213 near the side plate 211 of the movable scroll member 21, there is a ring-shaped movable race 214 on the end face of the side plate 211 opposite to the spiral body 212, and when the ball element 224 is sandwiched, the fixed ring 222 A movable ring 215 is abutted against the end surface of the movable race 214 so as to cover the movable race 214 with a slight gap therebetween, and these are fixed to the side plate 211 by spring pins 216.

As shown in FIG. 3, the movable ring 215 and the fixed ring 222 each have a plurality of dots (215a, 222a) at overlapping positions when the centers are aligned and overlapped.
is perforated in the axial direction.

Also, referring to FIG. 4, which shows the relationship between the movable ring and the fixed ring from the movable scroll member side, rotation prevention is performed by constantly pinching the ball element 224 between the inner edges of the pockets 215a and 222a. This is done by doing this. That is, when the movable scroll member 21 is driven to move in a clockwise circular orbit with a radius Ror as shown, the movable scroll member 21 has a point of application of the reaction force of the compressive force and a point of application of the driving force. The misalignment generates a rotational force in the clockwise direction in the figure. However, in the state shown in FIG. 4, the rotation of the movable ring 215 is prevented by the nine ball elements in the upper part of the figure among the ball elements 224 sandwiched between the pocket 215a and the pocket 222a. Integrated movable scroll member 2
1 will prevent rotation. Further, the pressure applied in the axial direction to the movable scroll member 21 due to the compressed gas force is thrust supported by the fixed race 221 via the movable race 214 and the balls 224. Therefore, the inner diameter and outer diameter of the movable race 214 and the fixed race 221 need only be large enough to secure the transfer area of the ball element 224.

Here, the movable ring 215 that constitutes the rotation prevention mechanism 22
It is necessary that the fixed ring 222 and the fixed ring 222 are firmly fixed to the side plate 211 and the front end plate 223 of the movable scroll member 21, respectively. Otherwise, the rotation prevention mechanism 22 will not be able to exhibit its intended effect. As described above, conventionally, in the rotation prevention mechanism 22, the movable ring 215 is fixed to the side plate 211 of the movable scroll member 21 by the spring pin 216 via the movable race 214, and the fixed ring 222 is fixed to the fixed race 221 by the spring pin 223. It is fixed to the front end plate 11 via. Also, this spring pin 216
and 223 also play the role of positioning.

[Problems to be Solved by the Invention] Generally, the inner side of the movable ring 215 and the boss 2 of the movable scroll member 21 are
13 is designed in advance so that there is a slight gap between them. Therefore, spring pins 216 and 223
The circular orbit movement of the movable scroll member 21 as shown in FIG.
radial and circumferential components of force act on the movable ring 215 and the fixed ring 222, thereby causing the spring pins 216 and 223
It had the disadvantage that it could come off or be damaged.

The present invention was made to solve the above drawbacks, and
The purpose is to prevent the spring pin from being pulled out and damaged.

[Means for Solving the Problems] That is, in the present invention, in order to fix the movable and fixed rings to the side plate and front end plate of the movable scroll member, respectively, instead of using only spring pins, caulking is also performed. I'm doing it. Therefore, in the present invention, the force acting on the spring pin due to the grinding motion,
In particular, the radial forces on the movable and fixed rings are significantly alleviated by caulking, thereby preventing the spring pin from being pulled out and damaged.

[Example〕 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 is a sectional structural view showing an embodiment of a scroll compressor to which the fixing method of the present invention is applied. As shown in the figure, the movable ring 215' is fitted into a boss 213 formed on the side plate 211 of the movable scroll member 21 with a stop fit, that is, a bolt-on fit. Caulking is applied from near the inside. The movable ring 215' has chamfered corners along the circumference of its inner diameter to be caulked. On the other hand, the fixing ring 222' is fitted into the axial protrusion 112 of the front end plate 11 provided on the outside of the fixing ring 222' with a stop fit, that is, a bolt fit, and is fixed using the axial protrusion 112. The ring 222' is caulked from near the outside. The fixed ring 222' has chamfered corners along the circumference of its outer diameter to be caulked.

6 to 8 illustrate the movable ring 215 shown in FIG.
6 is an exploded perspective view, FIG. 7 is a sectional view taken along line AA in FIG. 6, and FIG. 8 is a sectional view taken along line BB in FIG. 6. 215' in Figure 7
b is the chamfered portion of the movable ring 215';
22'b indicates a chamfered portion of the fixing ring 222'.

As described above, in the method of fixing the rotation prevention mechanism 22' of the scroll compressor 1' of the present invention shown in FIG. When fixing to the front end plate 11, not only the spring pins 216 and 223 are used for fixing, but also caulking is performed. Therefore, the force acting on the spring pins 216 and 223 due to the precession movement, especially the radial force of the movable ring 215' and the fixed ring 222', is significantly alleviated by the caulking, and the spring pins 216 and 223 can be easily removed. Damage can be prevented.

FIG. 9 is a perspective view showing another embodiment of the movable and fixed rings to which the fixing method of the present invention is applied. In the figure, the movable ring 215' has a radial recess 215'c in the inner radial direction corresponding to the position where caulking is performed. Further, the fixing ring 222' has a radial recess 222'c in the outer radial direction corresponding to the position where caulking is performed.

In this case, the caulking is performed in the radial recesses 215'a and 22
2'a, this caulking absorbs not only the radial force of the movable ring 215' and the fixed ring 2221 but also the circumferential force that acts on the spring pins 216 and 223 due to the precession movement. As a result, the stress is further significantly reduced, and the spring pins 216 and 223 can be more reliably prevented from being pulled out and damaged.

[Effects of the Invention] As is clear from the above explanation, according to the fixing method of the present invention, not only spring pins but also caulking can be used as means for fixing the movable and fixed rings to the side plate and front end plate of the movable scroll member, respectively. Since the spring pin is used, it is possible to prevent the spring pin from being pulled out and damaged, and the reliability of the rotation prevention mechanism is high.

Gashakai day

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional structural diagram showing an example of a conventional scroll compressor, Fig. 2 is an exploded perspective view of the drive mechanism shown in Fig. 1, and Fig. 3 is an exploded perspective view of the rotation prevention mechanism shown in Fig. 1. Exploded perspective view,
FIG. 4 is a diagram for explaining the principle of rotation prevention, FIG. 5 is a cross-sectional structural diagram showing an embodiment of a scroll compressor to which the fixing method of the present invention is applied, and FIGS. 6 to 8 is a diagram showing details of the movable and fixed rings shown in FIG. 5, and FIG. 9 is a perspective view showing another embodiment of the movable and fixed rings to which the fixing method according to the present invention is applied. 1. 1' is a scroll type compressor, 10 is a compressor housing, 11 is a front end plate, 12 is a cup-shaped part, 14 is a main shaft, 20 is a fixed scroll member, 21 is a movable scroll member, 22° 22' is a rotating part Blocking mechanism, 11
2 is an axial protrusion, 214 is a movable race, 215.21
5' and 215' are movable rings, 221 and 321' are fixed races, and 222, 222' and 222' are fixed rings, respectively. 4th garden Y 6th garden

Claims (9)

[Claims] 1. Provided between a front end plate constituting a part of the compressor housing and a side plate of a movable scroll member provided in the compressor housing for compressing fluid, while the movable scroll member moves in a circular orbit. A movable ring supported on a side plate of the movable scroll member to prevent rotation of the movable scroll member, and a fixed ring supported on the front end plate so as to leave a slight gap between the movable ring and the movable ring. and means for securing the movable and fixed rings to a side plate and a front end plate of the movable scroll member, respectively, the movable and fixed rings each having a plurality of axially perforated pockets extending from the center of each ring. In the rotation prevention mechanism for a scroll type compressor, which is provided at each position in the circumferential direction so that they can overlap when matched, one of the fixing means
A method for fixing a rotation prevention mechanism for a scroll compressor, comprising caulking at least one of the movable ring and the fixed ring. 2. The caulking uses a boss portion formed on a side plate of the movable scroll member that protrudes toward the front end plate and is provided inside the movable ring, so that the caulking is applied from near the inside of the movable ring of the boss portion. A method for fixing a rotation prevention mechanism of a scroll compressor according to claim 1, which is applied to a movable ring side. 3. The caulking is performed by using an axial protrusion of the front end plate that protrudes toward the side plate of the movable scroll and is provided outside the fixing ring, so that the caulking is applied from near the outside of the fixing ring of the axial protrusion. A method for fixing a rotation prevention mechanism of a scroll compressor according to claim 1, which is applied to a fixing ring side. 4. 3. The method for fixing a rotation prevention mechanism for a scroll compressor according to claim 2, wherein the movable ring has chamfered corners along the circumference of the inner diameter of the movable ring where the caulking is applied. 5. 4. The method for fixing a rotation prevention mechanism for a scroll compressor according to claim 3, wherein the fixing ring has chamfered corners along the outer circumference of the fixing ring where the caulking is applied. 6. 5. The method of fixing a rotation prevention mechanism for a scroll compressor according to claim 4, wherein the movable ring is fitted in a boss portion formed on a side plate of the movable scroll member in a snug fit. 7. 6. The method of fixing a rotation prevention mechanism for a scroll compressor according to claim 5, wherein the fixing ring is fitted into the axial protrusion of the front end plate in a snug fit. 8. 7. The scroll according to claim 2, wherein the movable ring has at least one radial recess in an inner radial direction corresponding to a position where the movable ring is caulked. How to fix the rotation prevention mechanism of a mold compressor. 9. Scroll according to claim 3 or 5 or 7, wherein the fixing ring has at least one radial recess in an outer radial direction corresponding to a position of the fixing ring where the caulking is applied. How to fix the rotation prevention mechanism of a mold compressor.