JPS61197785A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To simplify the structure of a frame by division-forming the frame of a scroll compressor and forming an accommodation chamber for a balance weight between a movable scroll supporting frame and a main-shaft bearing frame. CONSTITUTION:The frame of a scroll compressor is division-formed, and said frame is constituted by superposing frames 22 and 23. Onto the frame 22 for supporting a movable scroll 9, a bearing 24 for supporting a main shaft is installed, and a bearing 26 is installed also onto the main-shaft bearing frame 23, and a balance-weight accommodating chamber 29 in which a balance weight 28 travels is formed between the both frames 22 and 23.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a scroll compressor having an improved frame structure for supporting components such as a scroll compression element.

[Technical background of the invention]

Scroll compressors equipped with scroll compression elements have been developed. FIG. 4 shows a schematic structure of a compressor main body 1 of this type of scroll compressor, and 2 is a frame. A scroll-type compression element 3 is disposed on the upper side of the frame 2, and an electric motor section 4 is disposed on the lower side, and a crankshaft 5 is inserted through the center of the frame 2. The compression element 3 is formed by a fixed scroll 8 and an orbiting scroll 9, each having a spiral wrap 7 standing upright on an end plate 6.

A flange portion 11 is formed on the fixed scroll 8 at the lower end of the compression chamber side wall 10. Then, with the wrap 7 of the fixed scroll 8 facing downward, this 7 flange portion 1 is
1 is fixed to the frame 2, and a fixed scroll 8 is attached to the frame 2. Roughly speaking, the orbiting scroll 9 is arranged on the upper surface of the frame 2 with the wrap 7 facing upward, and both the wraps 7 of the fixed scroll 8 and the orbiting scroll 9 are combined in a superposed state with each other. . Further, the orbiting scroll 9 has a cylindrical boss portion 12 protruding from the lower surface of the end plate 6.
An eccentric portion 13 of the crankshaft 5 is attached to the crankshaft 2. The eccentric portion 13 is provided at the upper end of the main shaft portion 14 of the crankshaft 5.
The axis e is eccentrically formed by an appropriate distance S. Furthermore, a balance weight 15 is provided between the main shaft portion 14 and the eccentric portion 13 of the crankshaft 5. Further, a bearing portion 16 for pivotally supporting the crankshaft 5 and a housing chamber 17 for housing a balance weight 15 of the crankshaft 5 are formed in the frame 2, respectively. moreover,
On the upper surface of the frame 2, a high pressure receiver ring 18 that receives the thrust load of the orbiting scroll 9 and an Oldham ring (not shown) that prevents the orbiting scroll 9 from rotating are provided. Then, the orbiting scroll 9 is driven to orbit by the electric motor section 4 via the crankshaft 5, and as the orbiting scroll 9 rotates, the fixed scroll 8
A low-pressure compressed fluid, such as a refrigerant, is introduced into a substantially crescent-shaped compression chamber formed between the wrap 7 of the fixed scroll 8 and the wrap 7 of the orbiting scroll 9 from the suction hole 19 formed in the flange portion 11 of the The gas is compressed, and high-pressure compressed gas is discharged from a discharge hole 20 formed in the end plate 6 of the fixed scroll 8.

[Problems with Background Art] In the conventional configuration, the frame 2 is integrally molded from a metal material. Therefore, it is difficult to process the high pressure receiver formed in the upper part of the frame 2 to form the accommodation chamber 17 for the balance weight 15 inside the frame 2, which has an inner diameter larger than the inner diameter a of the support part 21 of the ring 18. There is a problem in that the structure of the frame 2 becomes complicated and manufacturing of the frame 2 becomes troublesome. Further, the high pressure receiver of the frame 2 with a small inner diameter dimension a is connected to the balance weight 15 having a large outer diameter dimension through the ring support section 21 in the accommodation chambers 1 and 7.
Since the frame 2 and the balance weight 15 must be inserted into the inside of the body, the shapes of the frame 2 and the balance weight 15 must be made into multiple shapes as shown in FIGS.

[Purpose of the invention]

This invention can simplify the structure of the frame,
It is an object of the present invention to provide a scroll compressor that can be easily manufactured by making balance weights for a frame and a crankshaft easier.

(Summary of the Invention) This invention forms a frame that supports each component such as an electric motor section and a compression element by joining a plurality of divided bodies, and accommodates a balance weight of a crankshaft between the divided bodies of the frame. It is characterized by the formation of a containment chamber.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Note that in FIGS. 1 to 3, the same parts as in FIGS. 4 to 6 are designated by the same reference numerals, and the explanation thereof will be omitted. In FIG. 1, reference numeral 21 indicates the electric motor section 4 and the compressor! This is a frame that supports each component such as the element 3. This frame 21 is provided with an upper divided body 22 and a lower divided body 23 which are divided into two parts vertically. In addition, the upper divided body 2 has a first shaft that pivotally supports the crankshaft 5 in the center part.
A bearing portion 24 is formed. Further, on the upper surface of the upper divided body 22, a high pressure receiver ring 25 that receives the thrust load of the orbiting scroll 9 and an Oldham ring (not shown) that prevents the orbiting scroll 9 from rotating are provided, respectively. Further, a second bearing portion 26 for pivotally supporting the crankshaft 5 is formed in the central portion of the lower divided body 23. It is formed to be larger than the distance t between the axis 0 of the main shaft 81114 of the rough crankshaft 5 and the outer peripheral portion of the balance weight 28 provided on the crankshaft 5. Then, with the upper divided body 22 installed on the lower divided body 23, the upper divided body 22 and the lower divided body 23 are joined to form the frame 21, and the recessed part 27 of the lower divided body 23 and The housing chamber 2 accommodates the balance weight 28 of the crankshaft 5 by the lower surface of the upper divided body 22.
9 is formed.

Therefore, in the structure described above, the upper and lower divided bodies 22 and 23, which are divided into two upper and lower parts, are joined to form the frame 21 that supports each component such as the electric motor section 4 and the compression element 3. Since the concave portion 27 of the lower divided body 23 and the lower surface of the upper divided body 22 form a housing chamber 29 for accommodating the balance weight 28 of the crankshaft 5, when assembling the compressor main body 1, the crankshaft is attached to the lower divided body 23. 5 is installed, and the balance weight 28 of the crankshaft 5 is accommodated in the recessed part 27 of the lower divided body 23.
2 can be joined to the lower divided body 23. Therefore, the process of forming the accommodation v29 for accommodating the balance weight 28 of the crankshaft 5 inside the frame 21 can be made easier than in the past, and the structure of the frame 21 can be simplified. Furthermore, since it is not necessary to insert a balance weight with a large outer diameter into a housing chamber through a ring support part as in the conventional high pressure receiver with a small inner diameter, the shapes of the frame 21 and balance weight 28 are changed as shown in FIG. The structure can be simplified as shown in FIG. 3, and the frame 21 and balance weight 28 can be manufactured easily.

Further, the upper divided body 22 is provided with a first bearing portion 24 and the lower divided body 23 is provided with a second bearing portion 26, and these first bearing portion 24 and second bearing portion 26 support the crankshaft 5. Since the first bearing portion 24 of the upper divided body 22 is configured to pivotally support the crankshaft 5, the crankshaft 5 can be pivotally supported at a position closer to the orbiting scroll 9 than in the past. Therefore, the moment force applied to the crankshaft 5 due to the force acting in the radial direction of the orbiting scroll 9 during rotation of the orbiting scroll 9 can be reduced, and the reliability of the first bearing section 24 and the second bearing section 26 is improved. It is possible to improve the

Note that this invention is not limited to the above embodiments. For example, in the above embodiment, the recess 27 is formed on the upper surface of the lower divided body 23, and the accommodation chamber 29 accommodates the balance weight 28 of the crankshaft 5 by the recessed portion 27 of the lower divided body 23 and the lower surface of the upper divided body 22. Although the configuration in which a recessed portion 27 is formed on the lower surface of the upper divided body 22 is shown,
The concave portion 27 of the upper divided body 22 and the upper surface of the lower divided body 23 may form a housing chamber 29 in which the balance weight 28 of the crankshaft 5 is accommodated.

Further, the frame 21 may be laterally divided into two or a plurality of divided bodies of three or more, and each of these divided bodies may be joined.

Of course, various other modifications can be made without departing from the spirit of the invention.

〔Effect of the invention〕

According to this invention, a frame that supports each component such as an electric motor section and a compression element is formed by joining a plurality of divided bodies, and a storage chamber for accommodating a balance weight of a crankshaft is provided between the divided bodies of the frame. Because of this, the structure of the frame can be simplified, and the balance weight of the frame and crankshaft can be manufactured easily.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this 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 upper division of the frame, Fig. 3 is a plan view showing the balance weight of the crankshaft, and Fig. 3 is a plan view showing the balance weight of the crankshaft. Figures 4 to 6 show conventional examples, where Figure 4 is a vertical sectional view showing the schematic structure of the compressor main body of a scroll compressor, Figure 5 is a plan view showing the frame, and Figure 6 is a crank. It is a top view which shows the balance weight of a shaft. 3... Compression element, 4... Electric motor part, 5... Crankshaft, 8... Fixed scroll, 9... Orbiting scroll, 21... Frame, 22... Upper division body, 23
...Lower division body, 28...Balance weight, 29
...Containment room. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 4 Factor 6 Figure 5

Claims (2)

[Claims] (1) A motor section is disposed on one side of the frame, and a compression element formed by a fixed scroll and an orbiting scroll is disposed on the other side, and the orbiting scroll is driven to orbit by the electric motor section via a crankshaft. A scroll type compressor, characterized in that the frame is formed by joining a plurality of divided bodies, and a storage chamber for accommodating the balance weight of the crankshaft is formed between the divided bodies of the frame. Machine. (2) The frame is formed by a first divided body placed on the compression element side and a second divided body placed on the electric motor side, and a crank is attached to each of these first and second divided bodies. A scroll compressor according to claim 1, characterized in that the scroll compressor is provided with a bearing portion for a shaft.