JPS60222582A - Hermetic electric compressor - Google Patents

Abstract

PURPOSE:To reduce the sliding loss between a vane and a roller by making a vane groove into sealed structure and allowing said vane groove to communicate to a suction passage and always keeping the vane groove part in low-pressure state. CONSTITUTION:The vane groove 10 of the captioned rotary compressor is formed into sealed state for the environment in a case by the bulging-out parts 15 and 16 of an upper bearing 13 and a lower bearing 14 tightened and fixed onto a cylinder 17. The side surface on the suction passage side of the vane groove 10 and a suction passage 11 are allowed to communicate through a thin hole 12. Therefore, the inside of thevane groove 10 is kept always in a low-pressure state, and the force pressing the vane 9 onto the outer periphery of a roller 4 is only the force of a spring 8, and the sliding loss generated between the vane 9 and the roller can be reduced.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is aimed at reducing sliding loss between the vanes and rollers of a hermetic electric compressor, and between the vanes and the vane sliding grooves, thereby improving performance. It is something.

[Background of the invention]

1 shows a cross-sectional view of a pump portion of a conventional rotary hermetic electric compressor. That is, due to the eccentric rotational movement of the crankshaft 6 and the roller 4, which are eccentrically arranged in the cylinder 2 inserted and fixed in the case 1, the refrigerant gas sucked through the suction passage 5 is transferred to the high-pressure refrigerant from the discharge port 6. and is ejected into the case.

In this case, the tip of the vane 7 is always pressed against the outer periphery of the roller 4 by a spring 8 to define a suction chamber and a discharge chamber.

In the case of the above-described pump structure, the roller 4 is subjected to the pressing force of the vane 71d and the spring 8, as well as the back pressure caused by the discharge pressure applied to the back surface of the vane. This increases the sliding loss of the vane 7, and also, since the vane 7 receives a force acting from the discharge chamber side to the suction chamber side due to the discharge pressure in the cylinder 2, the vane sliding installed between the vane 7 and the cylinder Sliding losses between the dynamic grooves occur.

For this reason, there was a drawback that mechanical loss of the compressor increased and efficiency decreased.

[Purpose of the invention]

The present invention was proposed to improve the above-mentioned drawbacks, and aims to reduce mechanical loss in the pump section by improving the sliding form between the vane and the roller. .

[Summary of the invention]

In other words, in order to eliminate back pressure on the back of the vane, the vane groove is made into a sealed structure in order to always maintain a low pressure state, and this is also made to communicate with the suction passage, and the direction of the vane groove is aligned with the center of the cylinder. This was invented to reduce sliding loss between the vane and the vane groove by creating a structure that is tilted at an angle relative to the vane groove.

[Embodiments of the invention]

The present invention will be explained below with reference to an embodiment shown in FIGS. 2 to 4.

FIG. 6 shows a longitudinal sectional view of the pump portion of the hermetic electric compressor having the structure of the present invention.

When the vane 9 reciprocates within the vane groove 10, the vane groove 10 is sealed against the atmosphere inside the case by the overhanging portions 15 and 16 of the upper bearing 16 and the lower bearing 14, which are fastened and fixed to the cylinder 17. It is formed.

On the other hand, the side surfaces of the suction passage of the vane groove 10 and the suction passage 11 are communicated with each other by an inlet 12.

Since the inside of the vane groove 10 is always maintained at a low pressure state, the force with which the vane tip presses against the outer periphery of the roller 4 is only the pushing force by the spring 9, and the sliding loss that occurs between the vane 9 and the roller 4 is reduced. can be reduced.

FIG. 4 is an explanatory diagram of sliding loss occurring between the vane groove 10 and the vane 9.

That is, by tilting the vane groove 10 by an appropriate angle θ with respect to the center of the cylinder 17, the outer circumference of the roller 4 and the vane 9
The frictional resistance F at the tip of the vane is reduced, and as a result, the pressing forces N+ and N2 generated between the vane groove 10 and the vane 9 are also reduced, and the sliding resistance is reduced.

〔Effect of the invention〕

In the case of a hermetic electric compressor having the cylinder, vane, and vane groove configured as described above, the sliding loss between the vane and the roller is reduced due to the elimination of back pressure applied to the back surface of the vane. Since the frictional resistance F is further reduced by tilting the groove with respect to the cylinder center, the sliding loss between the vane and the vane groove is reduced, which greatly contributes to improving the efficiency of the compressor.

As described above, in order to reduce the mechanical loss of a hermetic electric compressor, the present invention eliminates the back pressure applied to the back surface of the vane, and furthermore, by always making the contact between the vane and the roller diagonal at a certain angle, the vane and the vane are This was designed to reduce the loss between the grooves, and if the structure of the present invention is adopted, it will be possible to reduce the sliding loss in the pump part even in irregularly shaped roller types where the roller and shaft are integrated. −
C. Great effects can be expected.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a pump portion of a conventional hermetic electric compressor, FIG. 2 is a cross-sectional view of a pump portion of a hermetic electric compressor of the present invention, and FIG. 6 is a cross-sectional view of a pump portion of a hermetic electric compressor of the present invention. FIG. 4 is a longitudinal sectional view of the compressor, and is an explanatory sectional view of sliding loss occurring between the vane and the roller, and between the vane and the vane groove. 1... Case, 2... Cylinder, 6... Crankshaft, 4... Roller, 5... Suction passage, 6... Discharge boat, 7... Vane, 8... Spring , 9... Vane, 10... Vane groove, 11... Suction passage, 12...
...Small hole, 16...Upper bearing, 14...Lower bearing, 15...Overhang. 16... Overhanging part, 17... Cylinder, ¥, 1 Diagram stem 2 Diagram Y 3 Day 6 Triangle 4 side

Claims (1)

[Claims] 1. Sliding groove (10) of vane (9) and suction passage (11)
A closed type electric pressure Ita machine characterized by communicating with each other through a small hole (12). 2. Connect the vane sliding groove (10) to the upper bearing (15)
and an overhang (15) provided on the lower bearing (14)
, (16) The hermetic electric compressor according to claim 1 is characterized in that the vane sliding groove (10) has an inclination θ with respect to the center of the inner diameter of the cylinder (17). A hermetic electric compressor according to claim 1, characterized in that said compressor is provided as described above.