JPH079237B2 - Vane holding device for rotary compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane holding device for a rotary compressor, and more particularly to a vane retainer restraining means engaged with the vane.

[Prior Art] FIGS. 4 and 5 are vertical cross-sectional views showing a vane holding device of a rotary compressor disclosed in Japanese Patent Application No. 63-252579, which is a prior application. Is a cylinder, (2) is an eccentric rotary shaft, (3) is a rolling piston fitted to this eccentric rotary shaft, (4) is always in pressure contact with the outer circumferential surface of the rolling piston (3), and the slit (1
a) A vane that reciprocates in the cylinder (1) to divide the inside of the cylinder (1) into a high pressure chamber and a low pressure chamber, (5) a concave groove formed at the top of the vane, and (6) a concave groove ( A vane holder having a central portion inserted in 5), and a vane holder (7) swingably attached to the cylinder (1) at its central portion, one end of which is attached to the vane holder (6) and the other end thereof is attached to the above These operating fittings are locked to the free end of the spring (8) for pressing the vane (4) to the rolling piston (3).

In the above structure, when the eccentric rotation shaft (2) rotates, the rolling piston (3) rotates, and the low pressure chamber and the high pressure chamber formed by the rolling piston (3), the vane (4) and the inner wall of the cylinder (1) are As the rolling piston rotates, its volume is changed and the compression operation is repeated. At this time, the rear end of the vane holder (6) provided on the top of the vane (4) abuts on one end of the operating fitting (7), and the other end is locked to the free end of the spring (8), and this vane. The central part of the holding part (6) pushes the top part of the vane (4), and the vane (4) is constantly in pressure contact with the rolling piston (3).

[Problems to be Solved by the Invention] Since the conventional vane holding device for a rotary compressor is configured as described above, for example, when assembling, the vane holder is provided in the concave groove (5) at the top of the vane (4). When the central portion is not fitted in a regular state, the vane holder (6) is abnormally worn, and the pressure contact force of the vane holder (6) with respect to the vane (4) is biased, and this state is caused. There was a problem that the wear of the vane (4) was also increased in the operation at.

The present invention has been made to solve the above problems, and even when the engagement between the vane holder and the groove at the top of the vane is not in a normal state, this is automatically corrected by the initial compression stroke. The purpose is to return to the state.

[Means for Solving the Problems] In the case of the present invention, only when the vane holder (6) is not fitted in the concave groove (5) at the top of the vane in the normal state, the initial compression stroke is performed. The operation fitting (7) having an interference portion (7a) for abutting on the vane holder and correcting its position is used as a special part.

[Operation] In the case of the present invention, for example, when the initial compression stroke is performed in a state where the vane holder is disengaged from the concave groove at the top of the vane, the interference portion provided on the operation fitting of the vane holder causes The vane holder is pushed and returned to the normal state in the concave groove at the top of the vane.

[Embodiment] An embodiment of the present invention will be described below. That is, FIGS. 1 and 2 are a vertical sectional view and a plan view showing an embodiment of the present invention, and FIG. 3 is an enlarged view of a main part thereof. Although the same reference numerals are given and duplicate explanations thereof are omitted,
In the figure, (7a) is an interference part provided in the central part of the operating fitting (7) of the present invention. This interference part (7a) has a vane holder (6) which is normally formed in a concave groove (5) at the top of the vane. Only when the initial compression stroke is performed in a state in which the vane (6) is not fitted, the vane (6) is brought into contact with the central portion of the vane holder (6) as shown in FIG. 4) faces the top of the vertically moving slit (1a), so that the central portion of the operating fitting (7) has the slit (1a).
It is swingably supported in the vicinity of a), and both ends thereof are respectively locked by the vane holder (6) and the spring (8) as shown in FIG. It serves to maintain the normal position in the groove (5), and this is the feature of the present invention.

Next, the operation will be described. That is, for example, due to carelessness at the time of assembly, the central portion of the vane holder (6) is not fitted in the concave groove (5) at the top of the vane (4) in the normal state, and the initial compression is performed. At the beginning of the stroke, the swing of the operating fitting (7) causes the interference part (7
a) and the vane holder (6) are brought into contact with each other in the illustrated state, and the pressing force shown in (A) is applied to the vane holder (6). At this time, since the spring force (B) by the spring (8) acts on the vane holder (6), the vane holder is generated by the combined force (C) of the spring force (B) and the pressing force (A). (6) is pushed and fits into the groove (5). If the vane holder (6) comes off the groove (5) during operation, the vane holder (6) is returned to the groove (5) by the same action.

Incidentally, the interference portion (7a) of the operation fitting (7) is provided so as to interfere only when the vane holder (6) is not fitted in the concave groove (5) in a proper state, so that the vane holder (6) is of course in normal operation. Doesn't hurt.

EFFECTS OF THE INVENTION Since the vane holding device for the rotary compressor of the present invention is configured as described above, the vane holder is automatically maintained in the regular position in the concave groove at the top of the vane, and thus the vane holding device is held. Since there is no abnormal wear of the tool and there is no deviation in the direction of the pressure contact force of the vane holder with respect to the vane, the effect of reducing the wear of the vane can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a vane holding device for a rotary compressor according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an enlarged view of a main part of FIG. 1, and FIG. FIG. 5 is a vertical sectional view of a conventional vane holding device for a rotary compressor, and FIG. In the figure, (1) is a cylinder, (1a) is a slit, (3)
Is a rolling piston, (4) is a vane, (6) is a vane holder, (7) is an operating fitting, (7a) is an interference part, (8)
Is a spring. In the other figures, the same reference numerals indicate the same or corresponding parts.

Front page continuation (72) Inventor Masatoshi Sakai 3-18-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Works (56) Reference JP-A-1-315688 (JP, A) -171186 (JP, U) Actually opened 63-171683 (JP, U)

Claims (1)

[Claims] 1. A vane, one end of which is held by a cylinder of a rotary compressor, the other end of which is locked to the cylinder via a spring and which reciprocally slides in a slit formed in the cylinder at a central portion. In a vane holding device for a rotary compressor provided with a vane holder that is urged by the spring in a direction in which it is constantly pressed against a rolling piston in a cylinder, these vane holders and springs are locked at both ends thereof. The operation fitting is swingably disposed in the vicinity of the slit for sliding the vane, a part of the interference portion is exposed in the slit, and the interference portion allows the vane and the vane holder to be connected. A vane holding device for a rotary compressor, characterized in that the engagement is maintained in a normal state.