KR20040085425A - Refrigerator compressibility that use piezoelectric moter - Google Patents

Abstract

PURPOSE: A compressor for a refrigerator making use of an ultrasonic motor is provided to remove noise and to prevent hindrance of electromagnetic waves. CONSTITUTION: A compressor for a refrigerator making use of an ultrasonic motor(50) comprises closed casings(14,12); a cylinder block(18) having a cylinder(20) received in the closed casings; a piston(22) inserted in the cylinder to freely reciprocate in the axial direction; a valve plate(21) having a suction port arranged to an opening end of the cylinder; a suction and discharge valve(26) through which refrigerant gas is sucked and discharged; the ultrasonic motor comprising a rotor(56) and a vibration stator(54) having a piezoelectric body(55) attached to an elastic body to make the piston reciprocate; and a control part controlling electric input to the ultrasonic motor.

Description

Refrigerator compressor using ultrasonic motors {REFRIGERATOR COMPRESSIBILITY THAT USE PIEZOELECTRIC MOTER}

The present invention relates to a refrigerator compressor, and more particularly, to a refrigerator compressor using an ultrasonic motor having a driving force by friction between a stator and a rotor.

In general, a compressor converts mechanical energy into compressed energy of a compressive fluid. The compressor sucks refrigerant gas from a low pressure evaporator and raises the pressure to a condensing pressure. Rotary compressors. There is a turbo compressor type.

The compressor is used in a refrigerator or an air conditioner, and when used in a refrigerator, the inside of the refrigerator is used as a low heat source, and the saturated steam of a low boiling point refrigerant having the outside as a high heat source is compressed to a high pressure and flowed to a condenser.

In the condenser, latent heat of evaporation is discharged from a high-temperature and high-pressure refrigerant to a high heat source outside the refrigerator to cause a phase change to a liquid refrigerant gas, and the liquid refrigerant gas is throttled to low temperature and low pressure through an expansion valve. Then it enters the evaporator.

On the other hand, the low-temperature, low-pressure refrigerant gas in the evaporator absorbs latent heat from the low heat source inside the refrigerator as a liquid phase, causing a phase change to the refrigerant gas in saturated steam state, and then entering the compressor again, thereby forming a refrigeration cycle. As a result, the inside of the refrigerator is continuously supplied with cold air, resulting in a freezing effect.

FIG. 1 is a plan view showing the internal structure of a hermetic reciprocating compressor performing the above role, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. The upper and lower cases 14 and 12 are housed in a sealed manner and are compressed and / or leaf springs which are appropriate dust and soundproof means at predetermined intervals from the upper and lower cases 14 and 12. Is supported by the frame 16 at the bottom or side.

In addition, the compressor is composed of a cylinder block 18 fixed to the upper portion of the frame 16 in a horizontal shape and a piston 22 inserted into the cylinder 20 therein so as to reciprocate, and the piston 22 The valve plate 21 having the suction port is installed at the open end of the cylinder by the reciprocating motion of the cylinder, and the suction and discharge valves 26 provided at the left end of the cylinder block 18 constitute a low temperature and low pressure refrigerant gas. The suction and discharge of the high-temperature and high-pressure refrigerant gas are performed, and the suction and discharge valves 26 are passively opened and closed by pressure differences acting on both surfaces.

The reciprocating compressor configured as described above has a suction pipe 28 and a suction muffler 30 fixedly sealed to upper or lower casings 14 and 12 at a low temperature and low pressure during the backward movement of the piston 22. Through the external evaporator through the suction valve of the suction and discharge valve 26, the high-temperature, high-pressure refrigerant gas discharged from the compressor during the forward movement of the piston 22 is separated from the suction and discharge valve 26 From the discharge valve plate, the discharge pipe 32 and the upper to lower casings 14 and 12 are discharged to an external evaporator via a discharge pipe connecting pipe 34 fixedly sealed.

In addition, the refrigerant filling pipe 36 is fixed to the lower case 12 to be sealed and initially sealed after filling the refrigerant gas therein.

On the other hand, the electric motor 40 is composed of a stator 41 is fixed to the lower portion of the frame 16 and a rotor 42 which rotates with a gap between the stator 41, the rotor ( 42 is fixed to the rotating shaft 43 is supported rotatably on the frame 16 to rotate together.

The rotary shaft 43 of the electric motor 40 is formed to protrude the eccentric shaft 44 to the top of the frame 16 at the end to eccentric by connecting the piston 22 to the eccentric shaft 44 by the connecting rod and the number of shafts The piston 22 is to reciprocate as much as the eccentric rotation of the shaft 44.

However, the electric motor 40 is a system driven by electromagnetic force, and has a problem of being affected by electromagnetic noise and high frequency electromagnetic interference.

The present invention has been made to solve the above-described drawbacks, and has an object to provide a compressor for a refrigerator using an ultrasonic motor without noise and without interference of electromagnetic waves.

The present invention for achieving the above object, a closed casing (casing), a cylinder block having a cylinder housed in the sealed casing, a piston reciprocally freely inserted in the cylinder axially, at the opening end of the cylinder A valve plate having a suction port disposed therein, a suction and discharge valve in which refrigerant gas installed at one side of the valve plate is sucked and discharged, and a vibration stator having a piezoelectric divided into cells on an elastic body so that the piston reciprocates; Provided is a compressor for a refrigerator using an ultrasonic motor, the ultrasonic motor comprising a rotor and a controller for controlling an electrical input to the ultrasonic motor.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

1 is a plan view showing the internal structure of a conventional hermetic reciprocating compressor,

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a front view of a compressor for a refrigerator using an ultrasonic motor according to the present invention;

4 is a side view of a compressor for a refrigerator using an ultrasonic motor according to the present invention;

5 is a detailed view showing the bending vibration of the stator and the rotor during the resonance of the ultrasonic motor according to the present invention,

6 is a control flowchart of a compressor for a refrigerator using an ultrasonic motor according to the present invention.

<Description of the symbols for the main parts of the drawings>

50: ultrasonic motor 52: shaft

54 stator 55 piezoelectric body

56: rotor 60: power supply

61: high frequency oscillation circuit 62: control unit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a front view of a compressor for a refrigerator using an ultrasonic motor according to the present invention, FIG. 4 is a side view of a compressor for a refrigerator using an ultrasonic motor according to the present invention, and FIG. 5 is a stator during resonance of an ultrasonic motor according to the present invention. And is a detailed view showing the bending vibration of the rotor, Figure 6 is a control flowchart of a compressor for a refrigerator using an ultrasonic motor according to the present invention.

The same parts and numbers have been assigned to the same parts as in the related art except for the ultrasonic motor, and descriptions of duplicate parts are omitted.

As shown in FIGS. 3 and 4, the reciprocating compressor (hereinafter referred to as a compressor) 10 includes a sealed upper and lower case 14 and 12 and a cylinder 20 housed in the upper casing 14. A valve plate 21 having a cylinder block 18 to be provided, a piston 22 reciprocally inserted in the cylinder 20 freely in the axial direction, a suction plate disposed at an opening end of the cylinder 20, and a valve plate ( The suction and discharge valve 26 to suck and discharge the refrigerant gas installed on one side of the 21, the ultrasonic motor 50 for driving the piston 22, and the controller 62 for controlling the ultrasonic motor 50 are large. It is composed.

Here, the ultrasonic motor 50 according to the present invention is connected to one end of the piston 22 to transmit power, and a shaft 52 is rotatably fixed to the lower portion of the frame 16. And the rotor 56 of the disc laminated | stacked in the longitudinal direction in the shaft 52 is fixedly installed. The rotor 56 is coated with a material such as asbestos material to increase the friction force on the contact surface.

The stator 54 is installed between the rotors 56. The stator 54 has a piezoelectric member 55 attached to a cell divided portion, and each stator 54 is electrically connected to each other.

Then, a power supply unit 60 for supplying power to the stator 54 and a high frequency oscillation circuit 61 for converting an AC signal into a high frequency circuit are provided, and a control unit 62 for controlling the speed of the motor and the high frequency oscillation circuit 61. ) Is installed.

Referring to the operation of the low-noise discharge valve of the refrigerator compressor according to the present invention configured as described above are as follows.

5 and 6, when power is applied from the power supply unit 60, the high frequency oscillation circuit 61 converts an AC current into a high frequency. The converted high frequency is transmitted to the stator 54 connected to each circuit to cause the alternating vibration of the piezoelectric body 55 of the stator 54 to contract and expand (the alternating of + and-).

Repeated contraction and expansion of the piezoelectric member 55 causes the rotor 56 to be positioned at the top thereof to transmit friction and rotate. Therefore, the shaft 52, which is fixed to the rotor 56 and rotates together, is transmitted to the piston 22 so that the rotational movement is changed into a linear movement.

During the backward movement of the piston 22, the low-temperature, low-pressure refrigerant gas from the external evaporator through the suction pipe 28 and the suction muffler 30 fixedly sealed to the upper or lower casing (14, 12). The high-temperature, high-pressure refrigerant gas flowing into the suction valve of the suction and discharge valve 26 and discharged from the compressor during the forward movement of the piston 22 is discharged from the discharge valve plate separated from the suction and discharge valve 26. It is sent to the external evaporator via the discharge pipe connecting pipe 34 fixedly sealed to the 32 and the upper to lower casings 14 and 12.

Therefore, by applying the ultrasonic motor 50 using the piezoelectric body to the compressor, the noise is reduced, it is not affected by the electromagnetic field.

In the above description, it should be understood that those skilled in the present invention can only make modifications and changes to the present invention without changing the gist of the present invention as merely illustrative of a preferred embodiment of the present invention.

As described above, the refrigerator compressor using the ultrasonic motor according to the present invention has no noise of the compressor by using an ultrasonic motor driven by ultrasonic AC power of 20 kHz or more, and does not receive interference of electromagnetic waves, thus extending the life of the product. It is effective.

Claims (3)

A valve block having a closed casing, a cylinder block having a cylinder housed in the sealed casing, a piston freely reciprocally inserted in the cylinder, a valve plate having a suction port disposed at an open end of the cylinder, A suction and discharge valve for suctioning and discharging the refrigerant gas installed at one side of the valve plate, an ultrasonic motor including a vibrating stator and a rotor having a piezoelectric divided into cells on an elastic body to reciprocate the piston, and the ultrasonic motor Refrigerator compressor using an ultrasonic motor, characterized in that consisting of a control unit for controlling the electrical input. The method of claim 1, The compressor for a refrigerator using an ultrasonic motor, characterized in that the vibration stator and the rotor constituting the ultrasonic motor are alternately stacked. The method of claim 1, A compressor for a refrigerator using an ultrasonic motor, characterized in that asbestos is coated on one surface of the rotor to increase friction with the stator.