JPH0259309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention is used in the cylinder head of a compressor, such as a hermetic type, that forms the refrigeration cycle of a refrigerator or the like.

(B) Prior Art The cylinder head of a conventional compressor is formed by casting iron material, aluminum die-casting, or by fixing a plurality of iron plate-shaped press parts together by brazing in a furnace.

Although cast iron molded bodies have rigidity, they are not suitable for complex shapes and have poor heat conduction and poor heat insulation. Aluminum die-cast molded bodies can be made into complex shapes and have good heat dissipation properties, but they do produce cavities (pinholes).
Various airtight treatments are required, resulting in high costs. The combined body of iron plate-shaped pressed parts has good heat dissipation because it can be thinned in terms of strength and pressure resistance, but since multiple parts are bonded together by furnace brazing, the adhesive surface (sealing surface) Thermal distortion remains in the compressor, which often causes leaks during compressor operation. For this reason,
When assembling pressed parts, it is necessary to adequately control the variation in materials and the temperature in the furnace. Further, because of the thin wall, it is difficult to rework the mounting surface, the yield is low, and the cost is high.

(c) Purpose of the invention In view of the above, the present invention provides a compressor that has good heat conduction, does not require airtight treatment of the mounting surface, does not cause leakage, and has excellent strength. It provides a cylinder head.

(d) Structure of the Invention In the present invention, a protector made of a rigid material is provided on the surface of a molded body made by cold forging a metal material for drawing with good thermal conductivity such as an aluminum alloy.

(E) Embodiment FIG. 1 shows a hermetic compressor equipped with an embodiment of the present invention. In this compressor, an electric element 3 and a compression element 4 are supported within a case 1 via a spring 2, and the spring 2 buffers the impact force applied to the compressor during transportation. In this compressor, an electric element 3 rotates a crankshaft 5,
A piston 7 is slid within a cylinder 8 by an eccentric pin 6 of a rotating crankshaft 5. In addition to lubrication, the refrigerating machine oil 9 is pumped up by a centrifugal pump 10 in the crankshaft 5, squirted out from the piston hole 11, and collected by the seat push part 12 of the case, as shown by arrow A. The proper lower position is regulated, and the cylinder head 13 is guided to be used for cooling. In addition, the seat push part 12 of the case
elements 3 and 4 inside the case due to impact force during transportation etc.
When the cylinder over-vibrates in the vertical direction, it comes into contact with the cylinder head 13 and also functions as a stopper to prevent over-vibration. The reason why the cylinder head 13 is cooled is that this cylinder head functions as a passage for intake gas and discharge gas, and during normal operation, the compressed gas pressurized and heated by the piston 7 and cylinder 8 is discharged. Since the oil is guided to the cylinder head 13 via the discharge valve 14, the cylinder head 13 becomes the first gas reservoir and gets heated. Due to the heating of the cylinder, the compression capacity decreases, and oil sludge is generated in the discharge valve 14, causing the compressor to malfunction. This is because it will malfunction. Therefore, the cylinder head 13 is required to have a high heat dissipation effect. The cylinder head of the present invention is obtained by plastically working a metal material for drawing with good thermal conductivity, such as an aluminum alloy, by cold forging, and is provided with a reinforcing protector on its surface. An example will be described. The cylinder head 13 shown in FIGS. 2, 3, and 4 is formed by cold forging a metal material with good thermal conductivity, such as a wrought aluminum alloy. Cold forging is a method of forming a metal material by compressing it between dies at room temperature or below the recrystallization temperature. Specifically, the cylinder head 13 includes a portion 17 where the suction and discharge mufflers 15 and 16 are formed, and a heat dissipation fin 1.
The two metal materials corresponding to the portions 19 where 8 are formed are roughly formed while being joined by the first press working, and then the suction muffler 15, the discharge muffler 16 and Complex shapes such as the heat dissipation fins 18 are molded.
This molded body 20 is a soft material for stretching,
Compared to conventional combinations of cast iron molded bodies and iron plate-shaped pressed parts, it is weaker in strength and easily deforms and wears out.
A protector 21 made of a rigid material is provided. The protector 21 is integrally formed with a rib-shaped projection 22, which guides oil flowing through the cylinder head 13 and reinforces itself.

As shown in FIG. 5, the protector 21 is
The bolts 23 connect the suction valve 24, valve seat 25, discharge valve 14, cylinder head packing 26, and cylinder head main body 20.
, when installing it to the cylinder 8, this bolt 2
At the same time, it is fastened to the cylinder head body 20 by 3. The protector 21 protects the head body 2 made of a soft material when the cylinder head 13 collides with the seating part 12 of the case due to excessive vibration during transportation.
It functions to protect 0. Therefore, the head body 2
0 may be a soft material; therefore, surface hardening treatment such as hard alumite treatment, unlike conventional die cast molded products, is not required.

(F) Effects of the Invention Since the present invention is constructed as described above, it has good heat conduction, does not require airtight treatment of the mounting surface unlike conventional aluminum die-cast molded products, and is protected by a protector. A cylinder head with excellent strength can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a hermetic compressor equipped with an embodiment of the present invention, FIGS. 2 to 4 show an embodiment of the invention, and FIG. 2 is a partially omitted front view. , Figure 3 is an exploded perspective view, Figure 4 is a rear view, and Figure 5 is an exploded perspective view.
The figure is an exploded perspective view illustrating the mounting manner of the same embodiment. 20... Molded object (cylinder head body), 21
……protector.

Claims (1)

[Claims] 1. A cylinder head body made by cold forging of a metal material for drawing with good heat conductivity such as aluminum alloy and forming a reservoir chamber for high-temperature gas inside, and a surface of the cylinder head body made of a rigid material. A compressor cylinder head characterized by comprising a protector attached to the cylinder head.