JP2005133693A - Scroll fluid-machinery wherein gap is easily adjustable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor in which a gap between a fixed-scroll end-face and a swirl-scroll end-plate can be adjusted easily in a short time, and with a high accuracy in assembling a scroll compressor. <P>SOLUTION: An autorotation-inhibition crank for a swirl scroll is built beforehand in a bearing housing to constitute an autorotation-inhibiting mechanism. The swirl scroll with the built-in autorotation-inhibiting mechanism is mounted on a fixed scroll end-face through a shim for setting a correct gap between the fixed scroll end-face and the swirl scroll end-plate. The main-body housing is assembled so that the outside periphery of the bearing housing having the built-in autorotation-inhibiting mechanism is fit in the fitting hole of the bearing housing of the main-body housing. After removing the shim, the bearing housing is fastened to the main-body housing. Thus, an assemblage is completed so that the gap between the fixed-scroll end-face and the swirl-scroll end-plate becomes equal to the thickness of the shim. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  [Technical Field] The present invention relates to a scroll fluid machine in which a revolving scroll end plate surface is in sliding contact with a fixed scroll end surface, and a scroll fluid machine that easily adjusts a gap between the fixed scroll end surface and the revolving scroll end plate surface during assembly, and an assembly method thereof. About.

  Conventionally, in the scroll fluid machine of the above method, the adjustment of the gap between the fixed scroll end face and the orbiting scroll end plate surface during assembly is performed by setting the reference plane to the orbiting scroll and the distance from the end plate surface of the orbiting scroll to be assembled to the reference plane. And measuring the distance from the fixed scroll end surface to the reference surface of the orbiting scroll at the time of assembly, the distance is the distance from the end plate of the orbiting scroll to the reference surface, the fixed scroll end surface and the orbiting scroll end plate surface This is done by pushing the orbiting scroll through the rotation preventing crank and its bearing until a distance including a necessary gap is added.

  In more detail with reference to FIG. 5, 1 is a fixed scroll, 1c is a fixed scroll end surface, 2 is a turning scroll, and 2c is an end plate surface of the turning scroll. Reference numeral 3 denotes a main body housing which is fixed to the fixed scroll. Reference numeral 4 denotes a fixed scroll cover, and reference numeral 5 denotes a crank mechanism carrier fixed to the orbiting scroll for preventing rotation of the orbiting scroll. Hereinafter, the crank mechanism carrier 5 is also included when referring to the orbiting scroll. Reference numeral 12 denotes a rotation-preventing crank having a fixed-side crank pin 12a and a turning-side crank pin 12b that is eccentric to the pin 12a. Thus, as is well known, the orbiting scroll is prevented from rotating and is orbitally driven.

  The rotation-preventing crank 12 has two fixed-side crank pins 12a supported by the main body housing 3 via a pair of bearings 16, and two of the turning-side crank pins 12b via a pair of bearings 13. The carrier 5 and thus the orbiting scroll is supported. The bearing 13 has an outer ring fitted into the carrier 5 and fixed by a bearing retainer 14, and a turning-side crank pin 12 b of the crank 12 is fitted into the inner ring. The shoulder portion of the crank pin 12b is in contact with the end face of the inner ring, and the movement of the crank 12 to the left in the carrier is stopped. The overall configuration of the scroll fluid machine is the same as that shown in FIG. 1 according to the present invention, and the detailed description will be left to the description of FIG. The bearing 16 that supports the crank 12 on the main body housing 3 side prevents the outer ring from moving leftward by a bearing retainer 102. When assembling, it is necessary to assemble so that an appropriate gap f is secured between the fixed scroll end surface 1c and the orbiting scroll end plate surface 2c. For example, if the reference surface of the orbiting scroll 2 is the left end surface 2d of the carrier 5, the distance L from the orbiting scroll end plate surface 2c to the reference surface 2d varies depending on the individual orbiting scroll due to manufacturing tolerances. This distance L is measured for each orbiting scroll, and when assembling, while measuring the distance from the fixed scroll end surface 1c to the reference surface 2d of the orbiting scroll, the orbiting scroll is pushed so that the distance becomes L + f. . This pushing is performed in the process of tightening the bearing cover 100 with the tightening bolt 101.

  That is, the outer ring of the bearing 16 of the fixed crankpin 12a is manufactured in such a dimensional relationship that the right end face slightly protrudes from the right end face of the main body housing. Therefore, by tightening the tightening bolt 101 of the bearing cover 100, the outer ring of the bearing 16 is moved in the left direction until the amount of protrusion of the outer ring from the main body housing by deforming the bearing retainer 102 in the axial direction. That is, the orbiting scroll can be moved to the left. When the measuring device for measuring the distance from the fixed scroll end surface to the reference surface of the orbiting scroll shows an appropriate value of L + f, the tightening of the tightening bolt 101 is stopped.

  As described above, in the conventional compressor, the gap alignment is a very troublesome work, and since usually three crank mechanisms for preventing the rotation of the orbiting scroll are provided, the distance L + f is measured at these three locations. Since the push-in amounts of the three bearing covers must be adjusted, much time is required for assembly. Furthermore, since the gap f is not measured directly but adjusted via the distance L + f, the gap adjustment accuracy is also inferior.

  The present invention has been made in view of the above problems, and in a scroll fluid machine in which the orbiting scroll end plate surface is in sliding contact with the fixed scroll end surface, the clearance between the fixed scroll end surface and the orbiting scroll end plate surface is adjusted during assembly. It is an object of the present invention to provide a compressor that can be carried out easily in a short time and with high accuracy.

In order to achieve the above object, the present invention includes a turning scroll, a fixed scroll, and a main body housing fixed to the fixed scroll, and a fixed crankpin of a rotation preventing crank of the turning scroll is pivotally supported by the housing. A scroll fluid having a structure in which an orbiting crankpin is pivotally supported on an outer peripheral portion of the orbiting scroll, and an end plate surface of the orbiting scroll is assembled so as to have an appropriate gap between a scroll wrap top surface side end surface of the fixed scroll. In the machine
A bearing housing that supports the crank pin on the stationary side of the crank is provided, and the crank is assembled to the bearing housing to form a rotation prevention mechanism subassembly.
A fixing means for fixing the bearing housing to the main body housing;
The turning-side crank pin of the rotation prevention mechanism subassembly is fitted into the fitting hole of the outer periphery of the orbiting scroll to constitute the orbiting scroll assembly, and a shim having an appropriate thickness is laid on the end surface of the fixed scroll. After the mounting and assembling so that the outer periphery of the bearing housing of the orbiting scroll assembly is fitted into the bearing housing fitting hole of the main body housing, the shim is removed, and the bearing housing is removed from the main body via the fixing means. The present invention proposes a scroll fluid machine characterized by being assembled so as to ensure an appropriate gap between the fixed scroll end face and the orbiting scroll end plate surface by being fixed to a housing.

  According to this invention, the rotation-side crank pin of the rotation-prevention crank mechanism subassembly assembled via the bearing in a state where the rotation-preventing crank is fixed to the bearing housing in the axial direction is fitted into the fitting hole in the outer periphery of the orbiting scroll. An orbiting scroll assembly is assembled, and the orbiting scroll end plate surface of the orbiting scroll assembly is placed on the fixed scroll end surface through a shim having an appropriate thickness, and the bearing housing is inserted into the bearing housing fitting hole of the main body housing. The main body housing is assembled so as to be inserted, the shim is removed, and the bearing housing is fixed to the main body housing, so that only the shim thickness of the appropriate thickness is provided between the fixed scroll end surface and the orbiting scroll end plate surface. Since the orbiting scroll is assembled to the fixed scroll with the clearance of Gap adjustment between the fixed scroll end face and the orbiting scroll end plate surface is easy, made accurately that.

  The fixed-side crank bearing of the anti-rotation crank is preferably assembled so as to support the fixed-side crank pin by applying a preload so that there is no bearing gap. The bearing 16 is not inserted into the main body housing as in the conventional example shown in FIG. 5, but is inserted into and fixed to the bearing housing to be fitted into the main body housing later, so that the crank is applied so that an appropriate preload is applied to the bearing. Can be easily assembled. In this way, by using the anti-rotation mechanism sub-assembly in which the anti-rotation crank is pre-assembled to the bearing housing, for example, it is easy to measure the starting friction moment when the anti-rotation crank is assembled, and this friction moment can be managed. Thus, the variation in preload can be reduced.

  In addition, the present invention has the following effects. In other words, the rotation prevention crank of the orbiting scroll is assembled to the bearing housing to form a rotation prevention mechanism subassembly, and the orbiting scroll having the rotation prevention mechanism subassembly assembled to the proper thickness between the fixed scroll end surface and the orbiting scroll end plate surface. Place the shim on the fixed scroll end face, and remove the shim after assembling the main body housing so that the outer periphery of the bearing housing of the anti-rotation mechanism subassembly is inserted into the bearing housing fitting hole of the main body housing By fixing the bearing housing of the rotation prevention mechanism subassembly to the main body housing, the gap between the fixed scroll end surface and the orbiting scroll end plate surface can be easily assembled with high accuracy. In addition, when the fixed-side crank bearing of the rotation preventing crank is assembled by applying a preload to eliminate the bearing gap, the preload adjustment can be performed with high accuracy.

  Hereinafter, the present invention will be described in detail using embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention unless otherwise specified.

    FIG. 1 is a longitudinal sectional view showing an embodiment of a scroll compressor according to the present invention, and FIG. 2 is an enlarged view of a portion X in FIG. FIG. 3 is a view showing a state in which the main body housing is assembled to the orbiting scroll assembly mounted on the fixed scroll through the shim with the rotation prevention mechanism subassembly assembled. In FIG. 1, 1 is a fixed scroll, 2 is a turning scroll, 3 is a main body housing, 4 is a fixed scroll cover, 5 is an anti-rotation mechanism carrier, and 6 is a drive shaft. Reference numeral 8 denotes a balance weight attached to the drive shaft 6 or integrally formed. The rotation prevention mechanism carrier 5 is fixed to the orbiting scroll 2 with screws as shown in the figure. Hereinafter, the turning scroll 2 and the rotation prevention mechanism carrier 5 are collectively referred to as turning scroll.

  The drive shaft 6 has a drive eccentric pin 7 that is eccentric by an eccentric amount e at the left end thereof, and is supported on the main body housing 3 by drive shaft bearings 9 and 10. The drive eccentric pin 7 supports the orbiting scroll via a drive eccentric pin bearing 11 fitted to a hub at the center of the rotation prevention mechanism carrier 5 fixed to the orbiting scroll 2. Two fixed-side crankpins 12a of the rotation-preventing crank 12 are supported by two bearing housings 15 fixed to the main body housing 3 via a pair of fixed-side crank bearings 16 to constitute a rotation-preventing mechanism subassembly 20 ( (See FIG. 3). The crank pins 12a and 12b of the rotation preventing crank 12 are eccentric from each other by the same eccentric amount as the eccentric amount e with respect to the center of the drive shaft 6 of the drive eccentric pin 7. Two rotation-side crank pins 12b of the rotation prevention mechanism subassembly 20 are supported by the rotation prevention mechanism carrier 5 via a pair of rotation-side crank bearings 13. Three rotation prevention mechanisms are provided on the outer periphery of the orbiting scroll. When the drive shaft 6 is rotationally driven by a driving machine (not shown) with such a configuration, the orbiting scroll is orbitally driven in a state where rotation is prevented.

  The fixed scroll 1 has a fixed scroll wrap 1a and a cooling fin 1b, and is fixed to the main body housing 3 by screw fastening means 1f at an end surface 1c coinciding with the top surface of the scroll wrap. The orbiting scroll 2 has an orbiting scroll wrap 2a and cooling fins 2b, and the orbiting scroll end plate surface 2c includes an anti-rotation crank so that the orbiting scroll end plate 1c rotates with an appropriate gap between the end surface 1c of the fixed scroll. The position in the axial direction is determined by the prevention mechanism. The gap is sealed by a seal member 1e inserted in a ring-shaped groove on the end face of the fixed scroll.

  As the drive shaft 6 rotates, the fluid is sucked from the suction port 28 in the outer peripheral portion, compressed in the space formed by both scroll wraps, and discharged from the discharge port 29 in the central portion. A driving pulley 24 is fixed to the end of the driving shaft 6 opposite to the driving eccentric pin 7 with a bolt 25, and a sirocco fan 26 for sending cooling air is attached to the pulley. Reference numeral 27 denotes a fan casing, and cooling air is blown from the casing to a cooling fin of the fixed and orbiting scroll through an air guide path (not shown).

  The turning-side crank bearing 13 is fitted in a bearing fitting hole provided in the outer peripheral portion of the rotation prevention mechanism carrier 5 fixed to the turning scroll 2, and the outer ring is fixed by a bearing retainer 14. A fixed-side crank bearing 16 is fitted into the bearing housing 15 and its outer ring is fastened and fixed by a fastening screw member 21. A fixed-side crankpin 12a of the rotation preventing crank 12 is fitted to the inner ring of the bearing 16, and the inner ring is fixed to the fixed-side crankpin 12a of the crank 12 via a stud 17, a holding plate 18, and a nut 19. Yes. Reference numeral 23 denotes a cover. Therefore, the crank 12 is fixed to the bearing housing 15 so as to be rotatable and cannot move in the axial direction, and a rotation prevention mechanism subassembly 20 is formed.

  The orbiting scroll is assembled to the fixed scroll of the scroll compressor having the above-described configuration as follows. As shown in FIG. 3, a shim 30 having an appropriate thickness is placed on the end surface 1 c of the fixed scroll 1, and an orbiting scroll assembly in which the anti-rotation mechanism subassembly 20 is assembled thereon, and the drive shaft 6 is assembled. The main body housing 3 is assembled so that the bearing housing fitting hole is fitted into the outer periphery of the bearing housing 15 of the subassembly 20. Three rotation prevention mechanism subassemblies 20 are provided. When the main body housing 3 is fitted until the end surface on the fixed scroll side comes into contact with the end surface 1 c of the fixed scroll 1, the bearing housing 15 is fixed to the main body housing 3 by the bearing housing fixing member 22. This fixing is performed by applying an adhesive to a fitting hole between the fixing member 22 and the outer periphery of the bearing housing 15, inserting the adhesive into the outer periphery of the bearing housing 15, and tightening the main body housing with a screw. Then, the shim 30 is removed from a window appropriately provided on the outer peripheral wall of the main body housing 3. The bearing housing 15 is fixed to the main body housing in the axial direction and the rotational direction by the adhesive force of the adhesive.

  Various fixing methods for fixing the bearing housing 15 to the main body housing other than those described above are conceivable. FIG. 4 illustrates another embodiment. In this figure, the fixing means 31 is attached to the main body housing 3 with screws 33 and the set screw 34 prevents the movement of the bearing housing 15 in the axial direction and the rotational direction. Reference numeral 32 denotes a seal member. It is preferable to provide a plurality of set screws symmetrically about the center. In addition, it is desirable that the fixed crank bearing 16 is preloaded during the subassembly of the rotation prevention mechanism so as to eliminate the bearing gap, and according to the configuration of the present invention, this preload adjustment is managed with high accuracy. Can do.

It is a longitudinal cross-sectional view of the scroll compressor concerning the Example of this invention. It is the X section enlarged view in FIG. It is a figure which shows the condition which attaches a main body housing to the turning scroll assembly which assembled | attached the rotation prevention mechanism subassembly and was mounted via the shim on the fixed scroll. It is another Example of the bearing housing fixing means by this invention. It is sectional drawing which shows the rotation prevention mechanism assembly | attachment part of the conventional turning scroll.

Explanation of symbols

1 fixed scroll 2 orbiting scroll
3 Body housing
4 Fixed scroll cover
5 Anti-rotation mechanism carrier
6 Drive shaft
7 Drive eccentric pin 8 Balance weight 9, 10 Drive shaft bearing 11 Drive eccentric pin bearing 12 Anti-rotation crank 13 Turning-side crank bearing 14 Bearing retainer 15 Bearing housing 16 Fixed-side crank bearing 17 Stud 18 Retaining plate 19 Nut 20 Anti-rotation Mechanism subassembly 21 Tightening screw member 22 Bearing housing fixing member 23 Cover 24 Pulley 25 Bolt 26 Sirocco fan 27 Fan casing 28 Suction port 29 Discharge port 30 Shim 31 Bearing housing fixing member 32 Seal member 33 Screw 34 Set screw

Claims (2)

A rotating scroll, a fixed scroll, and a main body housing fixed to the fixed scroll; a fixed crank pin of the rotation preventing crank of the rotating scroll is pivotally supported by the main body housing; and the rotating crank pin is an outer peripheral portion of the rotating scroll A scroll fluid machine constructed so that an end plate surface of the orbiting scroll is assembled to have an appropriate gap with a scroll wrap top surface side end surface of the fixed scroll,
A bearing housing that supports the fixed-side crankpin of the rotation prevention crank is provided, and the crank is assembled to the bearing housing to form a rotation prevention mechanism subassembly;
A fixing means for fixing the bearing housing to the main body housing;
The turning-side crank pin of the rotation prevention mechanism subassembly is fitted into the fitting hole of the outer periphery of the orbiting scroll to constitute the orbiting scroll assembly, and a shim having an appropriate thickness is laid on the end surface of the fixed scroll. After the mounting and assembling so that the outer periphery of the bearing housing of the orbiting scroll assembly is fitted into the bearing housing fitting hole of the main body housing, the shim is removed and the bearing housing is inserted into the main body housing via the fixing means. A scroll fluid machine characterized in that an appropriate gap is secured between the fixed scroll end surface and the orbiting scroll end plate surface by being fixed to the scroll scroll machine.   2. The scroll fluid machine according to claim 1, wherein the fixed crank bearing of the rotation preventing crank is assembled so as to support the fixed crank pin so that a bearing gap is not applied by applying a preload.

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