JP2003343465A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary compressor of stable and high COP, by keeping an input value of electric power caused by increase in thrust force of a vane to the minimum. <P>SOLUTION: In the rotary compressor, a relationship between Cs and e meets Cs/e≤0.05, where Cs is a chamfer amount of a chamfered portion 12s formed on a low pressure side of an intersection of a vane groove 12 and a cylinder chamber 10, and e is a roller rotation eccentric amount of a roller 11. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used for air conditioning, refrigeration, etc., and more particularly to a rotary compressor having reduced sliding friction loss of vanes separated into a discharge side high pressure compression chamber and a suction side low pressure compression chamber. .

[0002]

2. Description of the Related Art Generally, a rotary compressor is partitioned into high pressure and low pressure by vanes which reciprocate in a vane groove formed in a cylinder provided in a compressor part which is driven to rotate by an electric motor part.

As shown in FIG. 4, a conventional vane groove 21 is used.
Has a rectangular cross section and has an elongated groove shape, and a chamfered portion 21s is formed on the low pressure side of the intersection of the vane groove 21 and the cylinder chamber 22. Then, regardless of the roller rotation eccentricity _{e 0} of the roller 23 which eccentrically rotates in the cylinder 22, in order to ensure the amount of lubricating oil, chamfering amount Cs0 chamfers 21s is in the vane sliding direction 0.4-1 .2m
Only m are taken.

However, when the chamfering amount Cs becomes large, the thrust force of the vane 25 which is received by the differential pressure in the compressor section 24 increases, the power input value increases, and the COP decreases. The rate of decrease in COP is affected by the roller rotation eccentricity e ₀ and changes. That is, the ratio of Cs ₀ and the roller rotation eccentricity e ₀ (Cs ₀ /
The larger e ₀ ) is, the more susceptible it is to the problem.

[0005]

Therefore, there has been a demand for a rotary compressor having a stable and high COP which minimizes the input value of electric power due to the increase of the thrust force of the vane.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a stable high COP rotary compressor which minimizes the input value of electric power due to an increase in thrust force of a vane. To do.

[0007]

To achieve the above object, according to one aspect of the present invention, a closed case, an electric element housed in the closed case, driven by the electric element, and In a rotary compressor having a rotary compression element in which a roller which is eccentrically moved is accommodated and which is provided with a cylinder chamber partitioned by a vane that reciprocates in a vane groove, Cs is the chamfering amount measured along the vane sliding direction of the chamfered portion formed on the low pressure side of the intersection of the vane groove and the cylinder chamber.
There is provided a rotary compressor characterized in that a relationship of Cs / e ≦ 0.05 is established between s and e. As a result, the input value of electric power due to the increase of the thrust force of the vane is minimized, and the stable high COP is achieved.
The rotary compressor of is realized.

In a preferred example, a chamfer having a chamfering amount equal to Cs is formed on the high pressure side of the intersection of the vane groove and the cylinder chamber.

This improves manufacturability.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a rotary compressor according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a conceptual view of a first embodiment of a rotary compressor according to the present invention, and FIG. 2 is a sectional view thereof.

As shown in FIG. 1, a rotary compressor 1 is constructed by internally mounting an electric element 3 and a rotary compression element 4 inside a hermetically sealed case 2, and the compression element 4 extends from a rotary shaft 5 extending from the electric element 3. Is inserted into the main bearing 6 and the sub bearing 7, and two cylinders 9 having the same shape are arranged between the main bearing 6 and the sub bearing 7 with a partition plate 8 provided between the main bearing 6 and the sub bearing 7. In the formed cylinder chamber 10, the eccentric portion 5a formed on the rotating shaft 5 has a cylindrical roller 1
1 are fitted together, as shown in FIG.
A vane 13 that slides between the high-pressure side groove side surface 12d and the low-pressure side groove side surface 12s of the vane groove 12 provided in the is provided. The vane 13 is constantly pressed toward the roller 11 by the spring 15 accommodated in the spring accommodating portion 14, and reciprocates in the vane groove 12 while slidingly contacting the outer peripheral surface of each roller according to the rotation of the eccentric portion 5a and the roller 11. The interior of each cylinder chamber 10 is pressure-divided into a suction cylinder chamber 10s and a compression cylinder chamber 10d.

The compressor 1 drives the electric element 3 to eccentrically rotate the roller 11 in the cylinder 10 chamber, so that the gas sucked into the suction cylinder chamber 10s in the cylinder chamber 10 through the suction port 16 is compressed. It is compressed while being moved in the direction of the chamber 10d and discharged from the discharge port 17.

Since the two cylinders 4 have the same shape, the lower cylinder will be described as an example.

As shown in FIGS. 2 and 3, the roller 11 that eccentrically rotates in the cylinder chamber 10 has its roller rotation eccentric amount set to e, and the vane groove 12 has a rectangular cross section and is an elongated groove. The chamfered portions 12s and 12d are formed at the intersection of the vane groove 12 and the cylinder chamber 10, that is, at the end of the vane groove 12, which has a shape. When the chamfering amount Cs of the chamfered portion 12s is measured along the vane sliding direction, the ratio (Cs / e) between this Cs and the roller rotation eccentricity e is Cs / e ≦ 0.05. Is set to hold. If Cs / e exceeds 0.05, the increase in input due to vane thrust sliding cannot be suppressed within 5%, and stable high COP cannot be realized.

A chamfered portion 12d having a chamfering amount Cd equal to the chamfering amount Cs of the chamfered portion 12s is formed on the high pressure side of the intersection of the vane groove 12 and the cylinder chamber 10. This improves manufacturability.

The rotary compressor according to the present invention is preferably provided with a chamfer on the high pressure side. However, if the chamfer is provided on the low pressure side, the chamfer is not necessarily required and the chamfering amount thereof is not required. Need not be set. Further, although the chamfered portion is formed by an inclined straight line, it may be formed by an arc or an arc.

Next, the refrigerant compression action using the rotary compressor according to the embodiment of the present invention will be described.

As shown in FIG. 1, the refrigerant evaporated in the low temperature side heat exchanger of the refrigeration cycle (not shown) to become a gas and return to the closed case 2 has a cylinder chamber 10 of the compression element 3.
Are sucked into, compressed by the rotation of the roller 11, and discharged to the high temperature side heat exchanger.

As shown in FIGS. 2 and 3, the vane 13 which is constantly pressed by the spring 15 and abuts against the roller 11 in the process of compressing the refrigerant is accompanied by the rotation of the eccentrically rotating roller 11 and the vane groove 12. Repeats reciprocating motion while sliding inside. The vane 13 that reciprocates in the vane groove 12 includes a compression cylinder chamber 10d and a suction cylinder chamber 1
A load is applied to the vane 13 due to the pressure difference from 0 s, and the vane 13, the low-pressure side groove side surface 12 a, and the high-pressure side groove side surface 12
Since b comes into line contact with the vane thrust force and slides, the input value of electric power due to sliding friction loss increases.
Further, the vane thrust force is proportional to the pressure difference ΔP × the projected area S of the vane in the compression chamber. Further, the projected area S of the compression chamber can be expressed by the roller rotation eccentricity e × cylinder height, and S is proportionally increased / decreased at a ratio of (e + Cs) / e = 1 + Cs / e. Here, assuming that the increased portion is Cs / e, by setting this value to a certain value or less, it becomes possible to suppress the increase in the input power due to vane thrust sliding to a certain rate or less.

Therefore, by setting Cs / e ≦ 0.05, it is possible to suppress an increase in input due to vane thrust sliding within 5%, and to realize a stable high COP. Further, in the manufacturing process of the rotary compression element, it is sufficient to set Cs and e so that Cs / e ≦ 0.05 is established, so that a manufacturing process that is easy and has good reproducibility and high versatility is realized. be able to.

[0022]

According to the rotary compressor of the present invention, it is possible to provide a stable rotary compressor having a high COP by minimizing the input value of electric power due to the increase of the thrust force of the vane.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of a rotary compressor according to the present invention.

FIG. 2 is a cross-sectional view of an embodiment of a rotary compressor according to the present invention.

FIG. 3 is a plan view near a vane of an embodiment of a rotary compressor according to the present invention.

FIG. 4 is a plan view near a vane of a conventional rotary compressor.

[Explanation of symbols]

1 Rotary compressor 2 sealed case 3 electric elements 4 Rotary compression element 5 rotation axes 5a Eccentric part 6 Main bearing 7 Secondary bearing 8 partition boards 9 cylinders 10 cylinder chamber 10d compression cylinder chamber 10s suction cylinder chamber 11 Laura 12 vane grooves 12a Low pressure side groove side surface 12b High pressure side groove side surface 12s, 12d Chamfer 13 vanes 14 Spring storage 15 spring 16 Suction port 17 outlet

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H029 AA05 AA09 AA13 AB03 AB08                       BB06 BB10 BB31 BB44 CC05                       CC32

Claims (2)

[Claims] 1. A closed case, an electric element housed in the closed case, driven by the electric element, and
A rotary compressor having a rotary compression element that accommodates a roller that eccentrically moves and that has a cylinder chamber that is pressure-partitioned by a vane that reciprocates in a vane groove. Let Cs be the chamfering amount measured along the vane sliding direction of the chamfered portion formed on the low pressure side of the intersection of the vane groove and the cylinder chamber, where Cs is between Cs and e.
A rotary compressor characterized in that the relation of s / e ≦ 0.05 is established. 2. The rotary compressor according to claim 1, wherein a chamfered portion having a chamfering amount equal to the Cs is formed on a high pressure side of an intersection of the vane groove and the cylinder chamber. Rotary compressor.