JPH0712074A - Rotary compressor - Google Patents

Abstract

PURPOSE:To balance a rotor and an eccentric part with each other without installing a counterweight. CONSTITUTION:A motor-driven element B housed in a sealed container 1 and a rotary compression element C which is housed in the sealed container 1 and is driven by a rotary shaft 4 of the motor-driven element B, are provided, and the motor-driven element B is composed of a stator 2 and a rotor 3 installed on the rotary shaft 4. In a rotary type compressor A where the rotary compression element C is composed of a cylinder 7, a roller 9 to rotate in the cylinder 7 by an eccentric part 4A of the rotary shaft 4 and the like, a lightweight part is formed in the rotor 3, and an imbalance quantity of the rotor 3 by this lightweight part and an imbalance quantity by the eccentric part 4A are balanced with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary compressor, and more particularly to a structure for reducing vibration generated by an unbalanced amount due to an eccentric portion of a rotary shaft.

[0002]

2. Description of the Related Art A conventional rotary compressor of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 3-31598 (F04C 2) prior to the present application.
9/02), an electric element having a rotary shaft on the upper side in the container and a rotary compression element driven by the rotary shaft of the electric element are housed on the lower side.
The electric element is composed of a stator and a rotor attached to the rotary shaft, and the rotary compression element is a cylinder and a rotor that rotates in the cylinder by an eccentric portion of the rotary shaft.
, An upper bearing portion and a lower bearing portion that seal the opening of the cylinder, a discharge valve that is attached to the lower bearing portion to open and close the discharge port, and a cup that is attached to the lower bearing portion so as to cover the discharge valve. It is composed of a muffler body.

In the case of an AC power supply drive type, a magnetic steel plate is usually used as the material of the rotor constituting a part of the electric element of the rotary compressor. Since the electromagnetic steel sheet has a uniform mass distribution, vibration generated by an unbalanced amount due to the eccentric portion of the rotating shaft can be easily reduced by attaching a counterweight to the rotor.

[0004]

However, in the case of the DC power supply drive type, a ferrite material is usually used as the material of the rotor, and this ferrite material has a non-uniform mass distribution as a manufacturing characteristic. , A static imbalance of the rotor itself occurs. In particular, since the direction of such imbalance is unknown until the rotor assembly is completed, conventionally, after assembling the electric elements, the static imbalance is corrected one by one, and then the above-mentioned eccentric part of the rotary shaft is used. There was a problem that the unbalance amount had to be calibrated. In addition to this, in the case of a rotor made of a ferrite material, there is a problem that it is difficult to attach the counter weight as described above.

The present invention has been made in order to solve the above-mentioned conventional technical problems, and it is easy and smooth to vibrate due to the static unbalance of the rotor or the amount of unbalance due to the eccentric portion of the rotating shaft. An object is to provide a rotary compressor that can be reduced.

[0006]

That is, a rotary compressor A according to the invention of claim 1 is an electric element B housed in an airtight container 1, and an electric element B housed in the airtight container 1 to rotate an electric element B. Axis 4
A rotary compression element C driven by a motor, and the electric element B is composed of a stator 2 and a rotor 3 attached to the rotary shaft 4, and the rotary compression element C is eccentric to the cylinder 7 and the rotary shaft 4. The rotor 3 is composed of a plurality of rotor cores 3A and 3B having different weights. The rotor 3 is composed of a plurality of rotor cores 3A and 3B having different weights. A weight part is formed, and the unbalance amount of the rotor 3 due to this weight part and the unbalance amount of the eccentric part 4A of the rotating shaft 4 are balanced.

Further, the rotary compressor A according to the invention of claim 2
Includes an electric element B housed in the closed container 1 and a rotary compression element C housed in the closed container 1 and driven by a rotating shaft 4 of the electric element B. And a rotor 3 attached to the rotary shaft 4, and the rotary compression element C is composed of a cylinder 7, a roller 9 that rotates in the cylinder 7 by an eccentric portion 4A of the rotary shaft 4, and the like. Notch 3C on part of rotor 3
Is formed, and the unbalance amount of the rotor 3 due to the cutout portion 3C and the unbalance amount due to the eccentric portion 4A of the rotating shaft 4 are balanced.

[0008]

According to the rotary compressor A of the invention of claim 1, the heavy rotor core 3A among the plurality of rotor cores 3A, 3B constituting the rotor 3 forms a weight portion in a part of the rotor 3. The direction of static unbalance of the rotor 3 caused by the weight part is uniquely determined by the position of the heavy rotor core 3A (weight part). Further, the eccentric portion 4A of the rotary shaft 4
Since the position of is also clear, it becomes extremely easy to balance the amount of imbalance caused by the eccentric portion 4A and the amount of static imbalance caused by the weight portion of the rotor 3 during assembly. As described above, the eccentric portion 4 of the rotary shaft 4 of the rotary compressor A can be used without using a conventional counterweight or the like.
It is possible to easily and smoothly reduce the occurrence of vibration caused by A and the unbalanced amount of the rotor 3.

According to the rotary compressor A of the second aspect of the present invention, the notch 3C is formed in a part of the rotor 3, and the direction of static imbalance of the rotor 3 caused by the notch 3C. Is uniquely determined in the direction (weight part) opposite to the cutout 3C. Further, since the position of the eccentric portion 4A of the rotary shaft 4 is also clear, it is extremely easy to balance the amount of imbalance caused by the eccentric portion 4A and the amount of static imbalance caused by the cutout portion 3C of the rotor 3 during assembly. Becomes As described above, it is possible to easily and smoothly reduce the occurrence of vibration caused by the unbalanced amount of the eccentric portion 4A of the rotary shaft 4 of the rotary compressor A and the rotor 3 without using a conventional counterweight or the like. Become. In particular, since the notch 3C is formed, it is easy to determine the direction of static imbalance, and therefore, the direction of the amount of imbalance due to the eccentric part 4A of the rotating shaft 4 and the direction of static imbalance of the rotor 3 are determined. It will be easier to match.

[0010]

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical sectional side view of a rotary compressor A of the present invention, and FIG. 2 is a plan view of a rotor 3 of the rotary compressor A. In the rotary compressor A of the present invention, an electric element B composed of a stator 2 and a rotor 3 is provided in an upper part of a closed container 1, and a rotary compression element composed of a cylinder 7 and upper and lower two rollers 9, 9 etc. is provided in a lower part thereof. C and are stored. Rotor 3 of electric element B
Is coupled to the upper part of the rotary shaft 4, and the rotary shaft 4 is rotatably supported by an upper bearing 5 and a lower bearing 6.

The upper bearing 5 and the lower bearing 6 are fixed to the cylinder 7 so as to seal the upper and lower openings of the cylinder 7. Further, eccentric parts 4A and 4A are formed between the upper and lower bearings 5 and 6 of the rotary shaft 4, and these eccentric parts 4A and 4A are formed.
The rollers 9 and 9 which are eccentrically rotated in the cylinder 7 are fitted in 4A. Further, 10 is an accumulator.

The operation of the above configuration will be described below. The gas sucked into the cylinder 7 through the suction pipes 13, 13 is
The volumes of the compression chambers 14 and 14 surrounded by the rollers 9 and 9 and the cylinder 7 decrease as the rollers 9 and 9 rotate, and are compressed, and the discharge muffler 16 passes through a discharge port and a discharge valve (not shown). After being discharged inside, it is discharged into the closed container 1 through a small hole provided in the discharge muffler 16. Then, the gas discharged into the closed container 1 is discharged from the discharge pipe 12 to the outside of the closed container 1 through the gap between the stator 2 and the rotor 3.

The rotor 3 of the electric element B is shown in FIG.
As shown in FIG. 4, the rotor cores 3A, 3A, 3B, and 3B are assembled, and the material is a farite material. Further, although the electric element B is a DC electric motor, it may be an AC electric motor. The ferrite material is used in the DC rotary compressor because it is necessary to magnetize the motor to make it a permanent magnet. Further, the number of divisions of the rotor 3 may be any number as long as it is divided into four or more, and it is appropriately determined according to the performance of the rotary compressor A.

Of the above four rotor cores, the adjacent two rotor cores 3A are heavy, and the other two rotor cores 3B are light. They are made of the same material but have different densities. With this configuration, the lighter rotor cores 3B and 3B are lighter, and the heavy rotor cores 3B and 3B are lighter.
Parts A and 3A become heavy. Therefore, the direction of the joint (weight part) between these heavy rotor cores 3A, 3A is uniquely determined in the direction of static imbalance of the rotor 3. Then, the rotor 3 is attached to the rotary shaft 4 so that the direction of the static unbalance is the same as the direction of the eccentric portion 4A on the lower side of the rotary shaft 4.

The unbalanced direction of the eccentric portion 4A on the lower side of the rotary shaft 4 is the protruding direction. Therefore, if the rotor 3 is fixed to the rotary shaft 4 so that the direction of the static imbalance of the rotor 3 and the direction of the lower eccentric portion 4A match,
Both unbalanced directions agree. Then, with the upper eccentric portion 4A as a reference, the upper eccentric portion 4A and the lower eccentric portion 4A
Is L1, the distance from the center of the rotating shaft 4 to the center of gravity of the lower eccentric portion 4A is r1, and the mass of the eccentric portion 4A is m.
1, the distance from the center of the upper eccentric portion 4A to the center of gravity of the rotor 3 is L2, the distance from the center of the rotating shaft 4 to the center of gravity of the rotor 3 is r2, and the heavy rotor cores 3A, 3A and the light rotor cores 3B, 3B are L1 × r where m2 is the weight difference
If it is designed and placed so that 1 × m1 = L2 × r2 × m2, the unbalance amount due to the eccentric portion 4A of the rotating shaft 4 and the rotor 3
It will be balanced with the unbalanced amount of.

As described above, according to the present invention, the direction of static imbalance of the rotor 3 is uniquely determined in advance. Therefore, at the time of assembly, the amount of imbalance of the rotor 3 and the amount of imbalance of the eccentric portion 4A of the rotating shaft 4 are determined. It becomes possible to easily balance the vibration, and thereby vibration of the rotary compressor A can be reduced. Further, at this time, it is not necessary to use a counterweight or the like as in the conventional case, and the number of parts and the number of assembling steps can be reduced. Particularly, as in the embodiment, the rotor core 3 is made of ferrite material.
This is extremely effective when A, 3A, 3B, and 3B are configured.

Next, FIGS. 3 and 4 show a vertical side view of the rotary compressor A of another invention and a plan view of the rotor 3 thereof. In the figure, the same symbols as those in FIGS. 1 and 2 are the same. Also in this case, the rotor 3 has four rotor cores 3.
Although the rotor core is configured by A, all rotor cores having the same weight are used. Further, a pair of adjacent rotor cores 3A, 3A are joined to each other at a joint portion which is notched in a V shape so as to be symmetrical with respect to the joint surface, and a notch portion 3C is formed.

With this configuration, the direction of static imbalance of the rotor 3 is uniquely determined in the direction (weight part) opposite to the cutout portion 3C with respect to the rotating shaft 4, so that the direction of the cutout portion 3C is downward. By attaching the rotor 3 to the rotating shaft 4 so as to be opposite to the eccentric portion 4A, the direction of static unbalance of the rotor 3 and the direction of unbalance of the rotating shaft 4 by the eccentric portion 4A can be easily matched. You can Further, in this case, since the same rotor core can be used, there is an advantage in parts management as compared with the above-mentioned structure, and the notch 3
Since the direction of static imbalance of the rotor 3 can be easily confirmed by the position of C, it becomes easy to match the direction of imbalance due to the eccentric portion 4A.

Also in this case, L1 × r1 × is caused by the weight difference m2 of the weight portion on the opposite side caused by the cutout portion 3C.
It is designed so that the relation of m1 = L2 × r2 × m2 is established. In the above description, the rotary compression element C having the two rollers 9 has been described.
The present invention is effective even if it has one or more rollers 9.

[0020]

As described above in detail, according to the present invention, a heavy rotor core among a plurality of rotor cores forming a rotor forms a weight portion in a part of the rotor, and the rotor static portion caused by the weight portion is formed. The direction of the physical imbalance is uniquely determined by the position of the weight part. Therefore, the unbalance amount generated by the eccentric portion of the rotating shaft and the unbalance amount of the rotor can be easily balanced, so that the vibration of the rotary compressor can be easily and smoothly reduced. It is possible.

In particular, since the direction of static imbalance of the rotor is determined by the rotor core constituting the rotor, it is not necessary to use a conventional counterweight or the like, and the number of parts and the number of assembling steps can be reduced. .

Further, according to the second aspect of the present invention, the notch is formed in a part of the rotor, and the direction of static imbalance of the rotor caused by the notch is unique in the direction opposite to the notch. To be determined. Therefore, the unbalance amount generated by the eccentric portion of the rotating shaft and the unbalance amount of the rotor can be easily balanced, so that the vibration of the rotary compressor can be easily and smoothly reduced. It will be possible.

In particular, since the number of parts and the number of assembling steps can be similarly reduced and the notch is formed,
Since the direction of the static unbalance of the rotor can be easily determined, the direction of the unbalance due to the eccentric portion of the rotating shaft and the direction of the static unbalance of the rotor can be easily matched.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an embodiment of a rotary compressor of the present invention.

FIG. 2 is a plan view of a rotor of the rotary compressor shown in FIG.

FIG. 3 is a vertical sectional side view of another rotary compressor of the present invention.

FIG. 4 is a plan view of a rotor of the rotary compressor shown in FIG.

[Explanation of symbols]

 A rotary compressor B electric element C rotary compression element 1 closed vessel 2 stator 3 rotor 3A rotor core 3B rotor core 3C notch 4 rotary shaft 4A eccentric 7 cylinder 9 roller

Claims (2)

[Claims] 1. An electric element housed in a hermetic container, and a rotary compression element housed in the hermetic container and driven by a rotary shaft of the electric element, wherein the electric element is a stator and the rotary shaft. A rotor attached to the rotary compression element, wherein the rotary compression element includes a cylinder and a roller or the like that rotates in the cylinder by an eccentric portion of the rotary shaft. Of the rotor core, and a heavy weight rotor core forms a weight part in a part of the rotor,
A rotary compressor characterized in that the unbalance amount of the rotor due to the weight portion and the unbalance amount due to the eccentric portion are balanced. 2. An electric element housed in a hermetic container, and a rotary compression element housed in the hermetic container and driven by a rotary shaft of the electric element, wherein the electric element is a stator and the rotary shaft. A rotor attached to the rotary compression element, wherein the rotary compression element includes a cylinder and a roller or the like that rotates in the cylinder by an eccentric portion of the rotary shaft. The rotary compressor is characterized in that the unbalance amount of the rotor due to the cutout portion and the unbalance amount due to the eccentric portion are balanced.