KR20110033740A - A rotary compressor - Google Patents

Abstract

PURPOSE: A rotary compressor is provided to stably control a blade, a roller and a motor by detecting and measuring the impedance change of the induction coil on the blade. CONSTITUTION: A rotary compressor(100) comprises a housing(140), an eccentric roller(150), a driving unit, blade(170) and a detector. The housing forms the internal space of a cylinder. The eccentric roller rotates on the rotor shaft of the cylinder at a regular speed. The driving unit rotates the eccentric roller. The blade translates along the blade guide groove(141) on one side of the housing and makes tight contact with the outer side of the rotating eccentric roller by an elastic member. The elastic member is inserted into the inner side of the blade guide groove. The detector detects the translation position of the blade.

Description

Rotary Compressor

The present invention relates to a rotary compressor, and more particularly, to a rotary compressor for easily detecting the position of the blade, the eccentric roller, and the rotor of the motor by sensing and measuring the impedance change of the induction coil wound on the blade. will be.

In general, the compressor may be said to increase the pressure of the refrigerant vapor, that is, to compress the vapor so that the refrigerant vapor evaporated in the evaporator is easily condensed. By the action of the compressor, the refrigerant circulates in the freezing device while repeating the condensation and evaporation process and transfers heat from a cold place to a warm place. In other words, the compressor in the freezer is a key component of the freezer.

Various types of compressors are currently used, but a commonly used compressor is a reciprocating compressor such as a rotary compressor, in which a low pressure fluid is sucked by a blade and a roller which translates inside a cylinder to increase pressure by a high pressure fluid. The fluid is discharged.

On the other hand, home appliances or industrial compressors to which the rotary compressor is applied have a need to control the rotary compressor precisely and precisely according to the needs of consumers or users. That is, in order to efficiently control the rotary compressor and easily grasp the mechanical characteristics of the rotary compressor, the position of the blade constituting the rotary compressor, the rotational position of the roller, or the rotational position of the rotor of the motor should be sensed and measured.

However, the high temperature inside the cylinder of the rotary compressor is very unsuitable for placing a conventional sensor capable of detecting the position of the blade, the rotational position of the roller or the rotational position of the rotor of the motor, and the inside of the cylinder in a high pressure state. It is maintained, and there is a problem that a change in pressure is very large according to the compression stroke so that an ordinary encoder or sensor cannot be used.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, by detecting and measuring the impedance change of the induction coil wound on the blade, the translational position of the blade, the rotational position of the eccentric roller, and the rotation of the motor. An object of the present invention is to provide a rotary compressor capable of stably controlling a blade, a roller, and a motor by easily sensing the rotational position of the former.

In order to achieve the above object, according to a preferred embodiment of the present invention, a cylinder, a suction pipe formed through the cylinder, a discharge tube spaced from the suction pipe and penetrated by the cylinder, and a fluid flowing from the suction pipe to the discharge tube A rotary compressor comprising a blade for separating, comprising: a housing forming a cylindrical inner space of the cylinder, an eccentric roller rotating at a constant rotational speed with the rotor shaft as a rotating shaft in the cylinder, and rotating the eccentric roller And a blade configured to translate along the blade guide groove formed on one side of the housing, the blade being in close contact with the outside of the rotating eccentric roller by an elastic member inserted and fixed inside the blade guide groove, and translation of the blade. Rotary, including a sensing unit for detecting the movement position It provides compressors.

Preferably, the sensing unit may be formed inside the blade guide groove, and may include an induction coil wound on the outside of the blade, and a power unit for applying an AC voltage to the induction coil.

Preferably, the sensing unit may measure the impedance of the induction coil changed by the alternating current voltage applied by the power supply unit to sense the rotational position of the driving unit and the rotational position of the eccentric roller.

Preferably, when the blade is withdrawn to the maximum length in the direction of the eccentric roller from the blade guide groove, the impedance of the induction coil sensed by the sensing unit has a minimum value, the blade is the eccentric from the blade guide groove When drawn out to the minimum length in the roller direction, the impedance of the induction coil sensed by the sensing unit may have a maximum value.

Preferably, the blade may include a magnetic material.

Preferably, the elastic member may be a spring.

Preferably, the drive unit includes a motor, the rotor of the motor may be coupled to the rotor shaft.

According to the present invention, by detecting and measuring the impedance change of the induction coil wound on the blade to easily detect the translational position of the blade, the rotational position of the eccentric roller, and the rotational position of the rotor of the motor, And it is effective to control the motor stably.

In addition, by winding the induction coil to the blade to detect the change in inductance, it is possible to detect the position of the rotor of the blade, the roller, and the motor at a low cost, it is easy to determine the mechanical characteristics of the rotary compressor, The blades, rollers, and motors can be applied to a wide range of refrigerators, air conditioners, or industrial compressors that require sensing the position of the rotor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the embodiment of the present invention will be described, and the description of other parts will be omitted so as not to disturb the gist of the present invention.

The terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings, and the inventors may appropriately use the concept of terms to describe their own invention in the best way. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only exemplary embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various equivalents may be substituted for them at the time of the present application. It should be understood that there may be water and variations.

1 is a schematic cross-sectional view of a rotary compressor according to the present invention, FIG. 2A is a schematic configuration diagram of a sensing unit of the rotary compressor of FIG. 1, and FIG. 2B illustrates an equivalent circuit of the sensing unit of FIG. 2A.

1 to 2B, the cylinder 110, the suction tube 120 penetrated through the cylinder 110, the discharge tube 130 spaced apart from the suction tube 120 and penetrated through the cylinder 110, and the suction tube 120. Rotary compressor 100 according to the present invention comprising a blade 170 for separating the fluid flowing from the discharge pipe 130 to the housing 140, the eccentric roller 150, the drive unit, the induction coil 210 The wound blade 170, and the sensing unit 180 is included.

First, the housing 140 forms a cylindrical inner space of the cylinder 110.

An eccentric rolloer 150 rotates at a constant rotational speed with the rotor shaft 151 as the rotation axis in the cylinder 110. That is, the eccentric roller 150 is rotated in the cylindrical inner space of the cylinder 110 with the rotor shaft 151 as the rotation axis, and the fluid (from the suction pipe 120 through the cylinder 110 to the discharge pipe 130) fluid), such as gas or liquid, by means of mechanical pressure. The flow of the fluid will be described later in detail with reference to FIG. 3.

The driving unit (not shown) rotates the eccentric roller 150 at a constant speed using the rotor shaft 151 as the rotation axis. For example, the driving unit may be a motor, and a rotor (not shown) of the motor may be coupled to the rotor shaft 151.

The blade 170 translates along the blade guide groove 141 formed at one side of the housing 140, and rotates by an elastic member 171, for example, a spring, which is inserted and fixed inside the blade guide groove 141. It is in close contact with the outside of the eccentric roller 150. That is, the elastic member 171 is fixedly coupled to one side of the blade 170, the other side of the blade 170 is in close contact with the eccentric roller 150. On the other hand, the elastic member 171 serves to provide an elastic force so that the blade 170 can be in close contact with the eccentric roller 150 during the compression stroke. Here, the blade 170 may include a metal material or may include a magnetic material. In addition, the blade 170 is reciprocated along the blade guide groove 141 by the eccentric rotation of the eccentric roller 150.

The sensing unit 180 detects a translational position along the blade guide groove 141 of the blade 170. For example, the sensing unit 180 may include an induction coil 181 formed inside the blade guide groove 141 and wound outside the blade 171, and a power supply unit 182 for applying a high frequency AC voltage to the induction coil 181. It includes. That is, the sensing unit 180 measures the impedance or inductance of the induction coil 181 that is changed by the alternating voltage applied by the power supply unit 182 to rotate the driving unit, for example, the rotor of the motor. The position and rotational position of the eccentric roller 150 are detected and recognized. On the other hand, the relative translational position of the blade 170 according to the impedance or inductance change is a direct expression of the rotational position of the rotor and the eccentric roller 150 of the motor.

Here, referring to FIG. 2B, an AC current flows in a closed circuit by an AC voltage applied to the induction coil 181. On the other hand, the amplitude and phase of the alternating current flowing through the induction coil 181 is due to the impedance of the closed circuit, that is, the resistance component and the inductance component of the closed circuit, and thus the alternating current flowing through the power supply unit 182. Depends on the magnitude and phase.

Further, the inductance of the induction coil 181 according to the translational position along the blade guide groove 141 of the blade 170, that is, the relative position of the blade 170 and the induction coil 181 in the blade guide groove 141. Will change. For example, referring to FIG. 2A, when the blade 170 is pulled out from the blade guide groove 141 to the maximum length in the eccentric roller 150 direction, the induction coil detected by the sensing unit 180 ( The impedance or inductance of 181 has a minimum value. That is, as is well known, since the length of the blade 170 including the metal material or the magnetic material located inside the induction coil 181 wound on the blade 170 is minimized, the inductance of the induction coil 181 is kept to a minimum value. To have.

On the other hand, referring to Figure 2a (b), when the blade 170 is drawn out of the blade guide groove 141 in the direction of the eccentric roller 150 to the minimum length, the induction coil (detected by the sensing unit 180 ( The impedance or inductance of 181) has a maximum value. That is, as is well known, the inductance of the induction coil 181 is the maximum value because the length of the blade 170 including the metal material or magnetic material located inside the induction coil 181 wound on the blade 170 is maximized. Will have

3 is a schematic cross-sectional view sequentially illustrating a compression stroke of the rotary compressor of FIG. 1, FIG. 4A is a graph illustrating a change in inductance of an induction coil according to the position of a blade due to the compression stroke of the rotary compressor of FIG. 3. 4B is a graph illustrating an inductance change of the induction coil according to the rotational position of the eccentric roller due to the compression stroke of the rotary compressor of FIG. 3.

3 to 4B, the compression stroke of the rotary compressor 100 according to the present invention is a sequential sequence of compression start (a), suction stroke start (b), suction stroke duration (c), and fluid discharge (d). The process is done.

In the compression start process (a), the suction pipe 120 and the discharge pipe 130 whose fluid flow is suppressed by the close contact with the eccentric roller 150 start to open. Here, since the blade 170 is drawn out from the blade guide groove 141 in the direction of the eccentric roller 150 with a minimum length, the inductance of the induction coil 181 detected by the sensing unit 180 has a maximum value. (See FIG. 4A). On the other hand, the rotational position of the eccentric roller 150 according to the pull out of the minimum length of the blade is defined as 0 rad. Accordingly, the inductance of the induction coil 181 at the rotational position of 0 rad of the eccentric roller 150 has a maximum value (see FIG. 4B).

Then, during the start of the suction stroke (b), when the π / 2 rad rotation in the counterclockwise direction about the rotor shaft 151 of the eccentric roller 150, the suction pipe 120 is opened to the low pressure fluid The fluid flows from the suction pipe 120 to the cylinder 110, and the high pressure fluid flows from the cylinder 110 to the discharge pipe 130. Here, the blade 170 is gradually drawn out from the blade guide groove 141 with the retraction of the eccentric roller 150 by the elastic force of the elastic member 171. Accordingly, the inductance value of the induction coil 181 gradually decreases. Meanwhile, the low pressure fluid and the high pressure fluid are physically separated by the close contact between the blade 170 and the eccentric roller 150.

Subsequently, during the suction stroke continuation process (c), when π rad rotation in the counterclockwise direction about the rotor shaft 151 of the eccentric roller 150 is carried out, a low pressure fluid flows from the suction pipe 120 to the cylinder 110. As it continuously flows, the high pressure fluid continuously flows from the cylinder 110 to the discharge tube 130. Here, since the blade 170 is drawn out at the maximum length in the direction of the eccentric roller 150 from the blade guide groove 141, the inductance of the induction coil 181 detected by the sensing unit 180 has a minimum value. (See FIG. 4A). Accordingly, the inductance of the induction coil 181 at the rotational position of rad of the eccentric roller 150 has a minimum value (see FIG. 4B).

Subsequently, in the fluid discharge process (d), when the π * (3/2) rad rotation in the counterclockwise direction about the rotor shaft 151 of the eccentric roller 150, the low-pressure fluid flows into the suction pipe 120 From the cylinder 110 to the continuous flow, the high pressure fluid from the cylinder 110 to the discharge tube 130 is continuously flowing. Here, the blade 170 is introduced into the blade guide groove 141 as the eccentric roller 150 moves forward. Accordingly, the inductance value of the induction coil 181 gradually increases. On the other hand, the sequential processes of the compression start (a), the suction stroke start (b), the suction stroke duration (c), and the fluid discharge (d) which are the compression strokes of the rotary compressor 100 are circulated.

Thus, as described above, by detecting and measuring the amount of change in inductance of the induction coil wound on the blade, by recognizing the translational position of the blade, the rotational position of the eccentric roller, and the position of the rotor of the motor, the blade, the eccentric roller , And motor can be controlled stably.

In the above description of the embodiments of the present invention, a rotary compressor having a specific shape and structure has been described with reference to the accompanying drawings. However, the present invention may be variously modified and changed by those skilled in the art. It should be interpreted as falling within the protection scope of the invention.

1 is a schematic cross-sectional view of a rotary compressor according to the present invention.

FIG. 2A is a schematic configuration diagram of a sensing unit of the rotary compressor of FIG. 1.

2B illustrates an equivalent circuit of the sensing unit of FIG. 2A.

3 is a schematic cross-sectional view sequentially illustrating the compression stroke of the rotary compressor of FIG. 1.

4A is a graph illustrating an inductance change of the induction coil according to the position of the blade due to the compression stroke of the rotary compressor of FIG. 3.

4B is a graph illustrating an inductance change of the induction coil according to the rotational position of the eccentric roller due to the compression stroke of the rotary compressor of FIG. 3.

Claims (7)

A rotary compressor comprising a cylinder, a suction pipe formed through the cylinder, a discharge tube spaced apart from the suction pipe and penetrated by the cylinder, and a blade separating the fluid flowing from the suction pipe to the discharge pipe, A housing forming a cylindrical inner space of the cylinder; An eccentric roller that rotates at a predetermined rotational speed using the rotor shaft as a rotating shaft in the cylinder, A driving unit for rotating the eccentric roller, A blade which translates along the blade guide groove formed on one side of the housing and is in close contact with the outside of the rotating eccentric roller by an elastic member inserted and fixed inside the blade guide groove; And a sensing unit for sensing a translation position of the blade. The method of claim 1, The detection unit, And an induction coil formed inside the blade guide groove and wound outside the blade, and a power supply unit applying an alternating voltage to the induction coil. The method of claim 2, The detection unit, And measuring the impedance of the induction coil that is changed by the alternating current voltage applied by the power supply, to detect the rotational position of the drive unit and the rotational position of the eccentric roller. The method of claim 3, wherein When the blade is withdrawn to the maximum length in the eccentric roller direction from the blade guide groove, the impedance of the induction coil sensed by the sensing unit has a minimum value, And when the blade is withdrawn from the blade guide groove in the direction of the eccentric roller with a minimum length, the impedance of the induction coil sensed by the detector has a maximum value. The method of claim 1, Rotary blade characterized in that the blade comprises a magnetic material. The method of claim 1, The elastic member is a rotary compressor, characterized in that the spring. The method of claim 1, The drive unit includes a motor, wherein the rotor of the motor is coupled to the rotor shaft, characterized in that the rotary compressor.

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