JP2009299608A - Hermetically-sealed compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compression element that can increase a capacity of a valve cover for forming a compression element encapsulated in an enclosed vessel without the need to change the height of the valve cover, and eliminate a clearance between an upper bearing and the valve cover, thus preventing leakage. <P>SOLUTION: A convex portion provided at un upper bearing for forming a compression element encapsulated in the enclosed vessel, and a valve cover is arranged on the convex portion. It becomes possible to freely change the capacity of the valve cover by varying a height of the convex portion. Also, by shrink-fitting the valve cover to the convex portion of the upper bearing, the clearance between the upper bearing and the valve cover is eliminated. By eliminating the leakage of a coolant from the compression element, the compressor with suppressed in oil discharge can be configured. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a hermetic compressor including an electric element and a compression element in a hermetic container.

Conventionally, in this type of hermetic compressor, a valve cover, an upper bearing, a piston, and a vane are arranged in a cylinder that forms a compression mechanism portion, and after positioning each component, the valve cover and the upper bearing are connected to the cylinder. It was in the form of fastening with bolts. The flange part of the upper bearing which arrange | positions a valve cover has taken the mechanism processed flatly in order to prevent the leakage of the refrigerant | coolant from a valve cover and an upper bearing (for example, refer patent document 1).
JP 2006-118421 A

  However, in the conventional structure, when it is necessary to increase the volume of the valve cover, the height of the valve cover is increased, particularly the thickness of the throttle portion is decreased, and the strength when liquid compression occurs is reduced. There was a problem. In addition, if the processing accuracy of the flat part of the upper bearing flange part and the valve cover is poor, refrigerant leaks from the gap between the upper bearing and the valve cover, and the surrounding oil is blown up. There was a problem that would increase.

  In order to solve the above-described conventional problems, the hermetic compressor of the present invention can increase the volume of the valve cover by providing a convex portion on the flange portion of the upper bearing on which the valve cover is disposed. Refrigerant leakage from the upper bearing and the valve cover is prevented by shrink fitting to the convex portion.

  The hermetic compressor of the present invention has the above-described configuration, so that the required valve cover volume can be secured without changing the height of the valve cover by changing the height of the convex portion of the upper bearing. It becomes possible to do. Further, by shrink-fitting the valve cover onto the convex portion of the upper bearing, the gap between the upper bearing and the valve cover can be made smaller than before, so that refrigerant leakage is reduced and the oil discharge amount can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a compression element of a hermetic compressor according to Embodiment 1 of the present invention. As shown in FIG. 1, a compression element formed of a cylinder 2, a crankshaft 3, a piston 4, a vane 5, an upper bearing 6, a lower bearing 7, and the like is configured in a sealed container 1. The compressed refrigerant gas is once discharged into the valve cover 8 through a discharge port provided in the upper bearing 6 and then discharged from the notch of the valve cover again.

As the displacement of the compressor increases, it is necessary to increase the volume of the valve cover 8 for temporarily receiving the discharge gas. At that time, generally, a method of increasing the height of the valve cover 8 is taken, but in that case, the thickness of the throttle portion of the valve cover becomes thin, leading to a decrease in strength.

  By providing the convex portion 6a on the upper bearing 6, a large volume can be secured even with a conventional valve cover. In addition, the volume can be freely changed by changing the height of the convex portion.

  Further, by tightening and fixing the valve cover 8 on the outer side of the convex portion of the upper bearing 6, there is no gap between the convex portion 6a of the upper bearing and the valve cover 8, and the leakage of the refrigerant gas is reduced. The oil is not blown up, and the amount of oil discharged from the compressor is finally reduced.

  As described above, since the hermetic compressor according to the present invention can obtain a compressor with less refrigerant leakage and less oil discharge amount, an apparatus using a heat pump such as an air conditioner, a dryer, or a water heater. Can be applied to.

Sectional drawing of the compression element of the hermetic compressor in Embodiment 1 of this invention Sectional drawing of the hermetic compressor in the conventional embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Cylinder 3 Crankshaft 4 Piston 5 Vane 6 Upper bearing 6a Upper bearing convex part 7 Lower bearing 8 Valve cover

Claims (3)

An airtight container, a cylinder disposed inside the airtight container, having a vane groove, a crankshaft having an eccentric portion, and an eccentric rotation inside the cylinder that is rotatably fitted to the eccentric portion of the crankshaft A piston that moves, a vane that is installed in the vane groove of the cylinder and reciprocates the vane groove while contacting a tip of the piston, and a vertical bearing that is installed so as to sandwich the cylinder, vane, and piston, In a hermetic compressor provided with a compression mechanism composed of a valve cover arranged on the upper bearing side, a circular convex portion is provided on the upper bearing flange portion, and a valve cover is installed on the convex portion. A hermetic compressor characterized by that. The hermetic compressor according to claim 1, wherein the valve cover is fixed with a bolt. 2. The hermetic compressor according to claim 1, wherein the valve cover is fixed to a convex portion provided on the upper bearing by shrink fitting.