JPS597039B2 - rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotary compressor that is incorporated into, for example, an air conditioner, and particularly relates to a rotary compressor that reduces rotational torque at startup.

[Technical background of the invention]

Generally, as shown in FIGS. 1 and 2, this type of rotary compressor includes a stator having oil return grooves 4a in a cylindrical casing 3 equipped with a refrigerant suction pipe 1 and a discharge pipe 2. A motor 6 consisting of a rotor 5 and a rotor 5 is provided, and a cylinder main body 9 of a rotary compression device including a suction port and a discharge port 8 is also provided below the motor 6.

Then, an eccentric part 10 formed on a rotating shaft 5a that is integral with the rotor 5 is disposed in this cylinder main body 9, and a ring-shaped roller (rotating body) 11 is fitted into this eccentric part 10,
A blade 12 is slidably fitted into the cylinder main body 9, and the blade 12 is pressed against the side surface of the roller 11 by the elasticity of a blade spring 13.

Therefore, in the rotary compressor, by driving the motor 6, the rotating shaft 5a which is integral with the rotor 5 rotates, and the eccentric part 10 rotates together with it.
The roller 11 fitted to the cylinder body 9
It revolves around the cylinder 9a while rotating, thereby pressurizing the refrigerant that has flowed in from the suction port to the discharge port 8.
From there, it can be pumped to a condenser as a refrigeration cycle.

Note that each of the oil return grooves 4a is connected to the main magnetic flux of the main winding 14 (
It is attached so as not to impair the magnetic flux generated by the main winding.

[Problems with background technology]

However, the main windings 14 and the auxiliary windings 15 constituting the stator 4 of the motor 6 are arranged at the upper part of the cylinder main body 9, and the position of the blades 12 of the rotary compression device is Because it is located directly below the winding 15, when the motor 6 is started, that is, when the rotor 5 starts moving from a stationary state, the force applied to the rotating shaft 5a is applied by the blade spring 13. This is the sum of the force and the motor pull force generated by the current flowing through the main winding 14, which increases the load at the time of starting, and as a result, the starting torque increases.

Referring to the graph shown in Figure 4, the curve ■
As shown in , the starting torque is the main winding pull force (
+1).

That is, the motor pull force due to the main winding 14 is in a direction that crosses the auxiliary winding 15 in the diametrical direction, as shown in FIG. Occurs at a position that overlaps with the direction.

On the other hand, the elasticity of the blade spring 13 causes the blade 12 to stop at the bottom dead center A (see FIG. 2), which is the minimum eccentricity position of the eccentric portion 10, when the rotary compression device stops. The motor pull force of the main winding 14 and the vector of the blade spring 13 are in the same direction,
The rotational torque required at startup becomes extremely large, and as a result, the starting torque of the motor increases, making it necessary to increase the output of the motor itself, which also has disadvantages such as increased power consumption. be.

[Purpose of the invention]

In order to eliminate the above-mentioned drawbacks, the present invention shifts the direction of the pressing force of the blades of the rotary compression device by about 90 degrees with respect to the direction of the motor full force due to the main winding of the stator built in the casing. and thereby
The present invention provides a rotary compressor whose purpose is to reduce the starting torque and improve the compression efficiency of the rotary compressor.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In FIG. 3, the reference numeral 6 is built into the cylindrical casing 3, as described above, and each oil return groove 4a
The stator 4 of this motor 6 is composed of a main winding 14 and an auxiliary winding 15, and the rotor 5 has an eccentric part 1.
A rotary shaft 5a integrally formed with 0 is firmly mounted.

Further, the casing 3 located below the motor 6 is provided with a cylinder body 9 of a rotary compression device having a suction port and a discharge port 8, and the cylinder 9a of the cylinder body 9 has the eccentric A roller 11 fitted into the portion 10 is provided.

Further, a blade 12 is slidably fitted into the cylinder main body 9 so as to be able to press against the side surface of the roller 11 by the elasticity of a blade spring 13, and the mounting position of the blade 12 is as follows. The main winding 14 is arranged to be shifted by about 90 degrees with respect to the direction of the motor pull force.

Therefore, the elasticity of the blade spring 130 is such that when the rotary compression device stops, even if the blade 12 is stopped at the bottom dead center position, which is the minimum eccentricity position of the eccentric portion 10,
The position of this blade 120 is about 9 with respect to the main winding 14.
It is located at a position shifted by 0°.

Therefore, the motor pull force of the main winding 14 and the vector of the blade spring 13 are shifted by approximately 90 degrees,
The rotational torque required to start the motor 6 becomes extremely small, which makes it possible to reduce the starting torque, reduce power consumption, and further reduce noise and vibration at the time of starting.

That is, in the present invention, starting is started from a state where the starting torque is the main winding pull force (-1), as shown by the curve ① in FIG.

Incidentally, the main winding 14 and the blade 1 in the above-mentioned embodiment
Although a specific example has been described in which the relative position with respect to 2 is about 90 degrees, the gist of the present invention is not changed.
For example, 90°±10°K design changes are free.

〔Effect of the invention〕

As described above, according to the present invention, the direction of the pressing force of the blades 12 of the rotary compression device is set at approximately 90° with respect to the direction of the motor pull force due to the main winding 14 of the stator 4 built in the casing 3. Because they are staggered, the directions of the force exerted by the elasticity of the blade spring 130 and the motor pull force of the main winding 14 are different, and by shifting them approximately 90 degrees, it is possible not only to significantly reduce the starting torque, but also to The compression efficiency of the rotary compressor can be improved.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams for explaining a conventional rotary compressor, Figure 3 is a cross-sectional view showing only the main parts of a rotary compressor according to the present invention, and Figure 4 is a main winding pull force. It is a graph showing the rotational position from the blade. 3...Casing, 4...Stator, 5...Rotor, 6...Motor, 11...Roller, 12...
Blade, 13...Blade spring, 14...Main winding, 15...Auxiliary winding.

Claims (1)

[Claims] 1. A rotary compressor characterized in that the direction of the pressing force of the blades of the rotary compressor is shifted by about 90 degrees from the direction of the motor pull force due to the main winding of the stator built in the casing.