JPS623187A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To reduce the generation of vibration when a crankshaft is revolved, by forming a recessed part for permitting the insertion of a projection part installed in projection towards the center part from the cylinder part side of a frame positioned between the balance weight accommodation part of a compressor body and a turning scroll, onto the balance weight. CONSTITUTION:A recessed part 22 is formed onto the outer peripheral partside of the balance weight 21 of a crankshaft 5, and a rib 13 for froming the slidable groove 15 of an Odldham's ring 14 installed in projection towards the center part from the cylinder part 2a side of a frame 2 can be inserted into the recessed part 22. Therefore, the rib 13 of the frame 2 can be released by the insertion into the recessd part 22 of the balance weight 21 when a compressore body 1 is manufactured, and the distance l3 from the center O of revolution of the balance weight 21 to the outermost peripheral position 21a can be shaped sufficiently large, and the sufficient centrifugal force can be developed by the balance weight 21 when the crankshaft 5 is revolved.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention drives an orbiting scroll in eccentric rotation.
□Related to a scroll compressor with improved crankshaft balance weight.

[Technical background of the invention]

Scroll compressors equipped with scroll compression elements have been developed. FIG. 5 shows a schematic structure of a compressor main body 1 of this type of scroll compressor, and 2 is a frame of the compressor main body 1. As shown in FIG. A scroll-type compression element 3I3 and an electric motor element 4 are respectively attached to the frame 2, and a crankshaft 5 is inserted through the center of the frame 2. Further, the compression element 3 is formed by a fixed scroll 6 and an orbiting scroll 7. These fixed scroll 6 and orbiting scroll 7
are respectively provided with wraps 6a and 7a formed in a spiral shape such as an involute. Then, the wrap 7a of the orbiting scroll 7 and the wrap 6 of the fixed scroll 6
a are engaged with each other at a position rotated by 180 degrees, and a crescent-shaped compression ring 8 is formed between the wrap 7a of the orbiting scroll 7 and the wrap 6a of the fixed scroll 6. Further, a cylindrical boss portion 9 is provided protruding from the lower surface of the rotating squirrel.

The crankshaft 5 also has an eccentric portion 5 at the upper end of the main shaft portion 5a.
b is provided. In this case, the axial center e of the eccentric part 5b is provided at a position offset by an appropriate distance S with respect to the axial center 0 of the main shaft part 5a, and this eccentric part 5b is connected to the boss part 9 of the orbiting scroll 7. has been done. Further, a balance weight 10 of the crankshaft 5 is provided at a stepped portion formed between the main shaft portion 5a and the eccentric portion 5b of the crankshaft 5. Further, a balance weight accommodating portion 12 for accommodating the balance weight 10 is formed in the frame 2 on a bearing portion 11 that pivotally supports the crankshaft 5 . Further, as shown in FIG. 6, the cylindrical portion 2a of the frame 2 located between the balance weight storage portion 12 and the orbiting scroll 7 has a plurality of holes protruding from the cylindrical portion 2a side toward the center. Ribs (protrusions) 13... are formed,
The sliding groove 15. of the Oldham ring 14 that prevents the rotation of the orbiting scroll 7 is located in a pair of opposing glues 713.13.
15 are formed respectively. This Oldham ring 1
4 is provided with a pair of key-shaped protrusions on the upper and lower surfaces of the ring body, and the installation direction of the pair of protrusions on the top side of the ring body and the installation direction of the pair of protrusions on the bottom side of the ring body are opposite to each other. They are arranged in orthogonal directions (X-axis direction and Y-axis direction). Furthermore, the Oldham ring 14 has a protrusion on the upper surface side of the ring body formed on the end plate of the orbiting scroll 7.
is slidably inserted into the sliding groove of the
□The protrusion on the lower surface side of the ring body is slidably inserted into the sliding grooves 15, 15 of the Oldham ring 14 formed in the frame 2. The Oldham ring 14 moves, for example, in the Y-axis direction while being guided along the sliding grooves 15° 15 formed on the frame 2, and at the same time moves the orbiting scroll 7 along the sliding grooves formed on the end plate. The crankshaft 5 driven by the electric motor element 4 is moved in the X-axis direction while being guided by the electric motor element 4.
As the orbiting scroll 7 rotates eccentrically with respect to the fixed scroll 6, the crescent-shaped compression hole 8 formed between the wrap 7a of the orbiting scroll 7 and the wrap 6a of the fixed scroll 6 is moved toward the center. The structure is such that it compresses in a spiral toward

(Problems in the Background Art) In the conventional configuration, the balance weight 10 of the crankshaft 5 is located at the eccentric portion 5 of the crankshaft 5 as shown in FIG.
It is formed by a 1111 body made of metal, for example, which is protruded in a direction opposite to the eccentric direction of b and is formed in a substantially fan shape. However, since a plurality of ribs 13 are provided between the balance weight accommodating portion 12 of the frame 2 and the orbiting scroll 7, the ribs 13 protrude from the cylindrical portion 2a side of the frame 2 toward the center. , if the distance λ2 from the center of rotation 0 of the balance weight 10 to the outermost circumferential portion 10a is made smaller by 1° than the distance axis between the tip portion 13a of the rib 13 and the center line 0, as shown in FIG. Compress the crankshaft 5 when manufacturing the compressor body 1,
:There was a problem that it could not be integrated into the main body 1 of the aircraft.
Therefore, the distance J22 between the rotation center O of the balance weight 10 and the outermost circumferential portion 10a cannot be made sufficiently large, and the balance weight 10 cannot exert sufficient centrifugal force. There was a problem in that the crankshaft 5 was likely to become unstable and vibrations were likely to occur as the crankshaft 5 rotated.
: Mi4 [Object of the invention]・'1 This invention can stabilize the rotation of the crankshaft,
It is an object of the present invention to provide a scroll compressor that can reduce the occurrence of vibrations when the crankshaft rotates.

[Summary of the invention]

In this invention, a scroll-type compression element formed by a fixed scroll and an orbiting scroll attached to an eccentric part of a crankshaft is mounted on a frame of a compressor main body, and a balance of the crankshaft is mounted on the frame. A balance weight accommodating portion for accommodating the weight is formed,
Furthermore, in the scroll compressor, a protruding part is formed that protrudes from the cylindrical part side of the frame toward the center, which is located between the balance weight housing part and the orbiting scroll. The present invention is characterized in that the balance weight is provided with a recess into which the protruding portion of the frame can be inserted.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Note that the same parts in FIGS. 1 to 4 as in FIGS. 5 to 8 are given the same reference numerals, and the explanation thereof will be omitted. That is, the present invention provides a balance weight 21 of the crankshaft 5 that protrudes toward the center from the cylindrical portion 2a side of the frame 2 between the balance weight accommodating portion 12 of the frame 2 of the compressor main body 1 and the orbiting scroll 7. It is characterized in that a recess 22 is provided through which the groove 13 for forming the sliding groove 15 of the Oldham ring 14 provided can be inserted. In this case, in the balance weight 21, as shown in FIG. 2, a notch portion having a shape corresponding to the shape of the rib 13 (approximately a fan shape) is formed at approximately the center of the outer peripheral side of the approximately fan-shaped main body 23. A recess 22 is formed by the notch. As shown in FIG. 3, this balance weight 21 is attached to the main shaft portion of the crankshaft 5
The inside of the main body 23 is provided with the outer peripheral side (the recessed part 22 side) protruding in the direction opposite to the eccentric direction of the eccentric part 5b on the stepped part formed between the eccentric part a and the eccentric part 5b. The peripheral side is attached □.

Therefore, in the case of the above configuration, the crankshaft
A recess 22 is provided on the outer peripheral side of the balance weight 21 of No. As shown in FIG.
Even when molded to an appropriate size that is larger than the distance between a and the center line 0 of the crankshaft 5 and slightly smaller than the radius 24 of the inner circumferential surface of the cylindrical portion 2a of the frame 2. When manufacturing the compressor main body 1, the rib 13 of the frame 2 can be inserted into the recess 22 of the balance weight 21 and released. Therefore, the distance 3 between the center of rotation 0 of the balance weight 21 and the outermost circumference 21a is limited to the distance I between the tip 13a of the rib 13 and the center line 0 of the crankshaft 5, as in the conventional case. Since the balance weight 2 can be molded sufficiently large without the need for rotation of the crankshaft 5,
1, it is possible to exert sufficient centrifugal force, stabilize the rotation of the crankshaft 5, and reduce the occurrence of vibrations when the crankshaft 5 rotates.

Note that this invention is not limited to the above embodiments. For example, the balance weight 21 may be integrally formed with the main body of the crankshaft 5 by means such as casting, and in this case, manufacturing of the crankshaft 5 can be facilitated.

Alternatively, the balance weight 21 may be formed by combining a plurality of components, and the recess 22 may be formed in the component with the largest outer diameter. Furthermore, it goes without saying that various other modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

According to this invention, the balance weight of the crankshaft is provided with a protrusion that protrudes toward the center from the cylindrical part side of the frame located between the balance weight accommodating part of the compressor main body and the orbiting scroll. Since the recessed portion through which the crankshaft can be inserted is provided, the rotation of the crankshaft can be stabilized, and vibrations generated during rotation of the crankshaft can be reduced.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention.
Fig. 1 is a vertical cross-sectional view showing a schematic configuration of the compressor main body of a scroll compressor, Fig. 2 is a plan view showing the balance weight, Fig. 3 is a plan view showing the installation state of the balance weight on the crankshaft, Fig. 4 is a longitudinal sectional view of the main parts, Figs. 5 to 8 show a conventional example, Fig. 5 is a longitudinal sectional view showing the schematic structure of the compressor main body of a scroll compressor, and Fig. 6 7 is a plan view showing the frame of the compressor main body, FIG. 7 is a plan view showing the mounting state of the balance weight of the crankshaft, and the eighth factor is a longitudinal sectional view of the main part. DESCRIPTION OF SYMBOLS 1... Compressor main body, 2... Frame, 2a... Cylindrical part, 3... Compression element, 5... Crankshaft, 5a...
... Eccentric part, 6... Fixed scroll, 7... Orbiting scroll, 12... Balance weight storage part, 13.
...Rib (protrusion), 21...Balance weight, 2
2... Concavity. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 F Figure 2 Figure 3 Figure 4 Figure 5 WJ Figure 8

Claims (1)

[Claims] (1) A scroll-type compression element formed by a fixed scroll and an orbiting scroll attached to the eccentric part of the crankshaft is mounted on the frame of the compressor main body, and A balance weight accommodating portion for accommodating the balance weight of the crankshaft is formed in the frame, and a balance weight accommodating portion protrudes toward the center from the cylindrical portion of the frame located between the balance weight accommodating portion and the orbiting scroll. What is claimed is: 1. A scroll compressor having a protrusion formed therein, wherein the balance weight of the crankshaft is provided with a recess shaped so that the protrusion of the frame can be inserted therethrough. (2) The balance weight is integrally molded with the main body of the crankshaft.
1) Scroll compressor described in section 1). (3) The scroll compressor according to claim (1), wherein the balance weight is a component separate from the crankshaft body and joined to the crankshaft body. . (4) The scroll compressor according to claim (1), wherein the balance weight is formed by combining a plurality of structural members.