JPS6143286A - Sealed type compressor - Google Patents

Abstract

PURPOSE:To prevent the reduction of capacity efficiency by accommodating the large edge part of a connecting rod into the eccentric core part of a crankshaft and setting the eccentric core part into a cylinder part, revolving the connecting rod, thus reducing the area of a slot in the cylinder part and permitting a large area for the slidable part of a piston. CONSTITUTION:The large edge part 19 of a connecting rod 12 is fitted onto the eccentric core part 10 of a crankshaft. A slot B is previously formed onto a cylinder 16' so that the connecting rod 12 is turned to be set into the cylinder 16'. The slot B is formed so that the connecting rod 12 can pass when the eccentric core part 10 is at the top dead center position of a piston 11. The piston 11 is inserted, and the small edge part 21 of the connecting rod 12 is fitted. Said fitting part is connected with a crank pin 13 inserted from a penetration hole A formed on the lower part.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic compressor used in refrigerator-freezers and the like.

Conventional configuration and its problems Figures 3 and 4 show a conventional hermetic compressor.

This will be explained with reference to FIG. In FIG. 4, reference numeral 1 denotes a hermetic compressor block, with a compressor 2 fixed above, an electric motor 3 fixed below, and a closed container storing lubricating oil 5 at the bottom via a suspension system 4. 6 is supported and suspended. 7 is the stator of the electric motor 3, 8 is the rotor, and 9 is the rotor 8.
1o is the crankshaft upper eccentric portion. 11 is connected to 1 through the eccentric part 10.
13 is a bistorch pin that connects the piston 11 and the connecting rod 12; 14 is a refrigerant gas suction pipe that sucks return gas from the refrigeration cycle; 16 is a valve plate; 16 is a cylinder;
7 is a cylinder head, and 18 is a discharge pipe.

Conventionally, in the case of a connecting rod type hermetic compressor in which the bearing part of the block of the hermetic compressor and the cylinder are integrated, a connecting rod 12 is attached to the top of the cylinder as shown in Fig. 4 for assembly work. A slot 20 of a size corresponding to the small end 21 of is provided, as shown in FIG.
Insert the large end 19 of the connecting rod 12 into the crankshaft eccentric portion 1o from the direction, insert the piston 11 into the small end of the connecting rod 12 from the L direction, and from the M direction.
The piston pin 13 was assembled by passing through the slot 2° in the upper part of the cylinder and inserting it into the hole of the piston and the connecting rod.
This has the disadvantage that a large amount of pressure is required, which increases the surface pressure of the cylinder and impairs reliability.

Purpose of the Invention In view of the above points, the present invention aims to reduce the area of the slot in the cylinder portion.

Structure of the Invention To achieve this objective, the present invention consists of housing the large end of the connecting rod in the eccentric part of the crankshaft, and while rotating the connecting loft, setting it in the cylinder part, inserting the piston, and inserting the piston into the block. By inserting the piston pin through the hole at the bottom of the cylinder, the size of the slot in the cylinder can be reduced.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Note that the same parts as those in the conventional example are indicated using the same reference numerals. In Figure 2, 12 is .

A connecting rod whose large end is accommodated in the eccentric part 10 of the crankshaft, and 11 is a connecting rod 1 connected to the eccentric part 1o
2 is a reciprocating piston, 13 is a piston pin that connects the piston 11 and the connecting rod 12, and 16' is a cylinder. 19 is a large end of the connecting rod 12, and 21 is a small end of the connecting rod 12. A is a hole into which the piston pin 13 is inserted, and B is a hole in which the connecting rod 12 is inserted into the cylinder 16'.
7).

In the above configuration, the assembly order of the piston and piston pin portion in the hermetic compressor of the present invention is shown in Fig. 2.
explain. In FIG. 2, the large end 1 of the connecting rod 12
9 to the eccentric part 1o of the crankshaft, rotate the connecting rod 12 in the direction of the arrow P, pass the thrower) B, set it in the cylinder part 16', and move the piston 11 in the direction of the arrow Q.
After inserting the piston pin 13 at the position 1 that matches the hole A into which it is inserted, if the piston pin 13 is inserted from below (in the direction of the arrow R), the piston 11 and the connecting rod 1 are inserted.
2 can be connected.

Effects of the Invention As shown in FIG. 1, in the conventional method, the length of the slot in the cylinder portion was X, but in the case of the present invention, the length of the slot in the cylinder portion is Y, and X>Y. The sliding part of the piston can be enlarged. Therefore, there is less reduction in volumetric efficiency.

[Brief explanation of drawings]

FIG. 1 is a plan view of a cylinder section of a hermetic compressor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a rotating section, FIG. 3 is a longitudinal sectional view of a conventional hermetic compressor, and FIG. This figure is a plan view of the main part of FIG. 3, and FIG. 5 is an exploded perspective view of the main part for explaining the assembly of a conventional piston and connecting rod. 16'...Cylinder, 2...Block, 1
0...Crankshaft, 12...Connection rod, A...Through hole, B...Slot, 13...Piston pin, 19.・・・・・・
Big end, 21...small end. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure X 〃 Figure 4

Claims (1)

[Claims] a block having a cylinder; the cylinder has a side wall; a crankshaft is rotatably accommodated in the block; a large end accommodated on the spindle of the crankshaft has a hole; A connecting rod having a hole is provided in the side wall of the cylinder at a position corresponding to the radius of rotation when the connecting rod is rotated about the crankshaft support shaft when the crankshaft is at its bottom dead center. The lower part of the block has a slot provided therein and a through hole that matches the hole position of the small end of the connecting rod, and the connecting rod is connected to the cylinder part by rotating about the crankshaft support shaft part as a fulcrum. At the same time as positioning the small end of the rod, insert the piston into the small end,
and a piston pivotally supported in the side-by-side openings of the piston, the piston being completely surrounded by the openings and the small end, and the piston pin having the connecting rod and the crankshaft at a bottom fulcrum. A hermetic compressor in which the piston pin is inserted into the piston through the through-hole in the block, coinciding with the through-hole in the block.