KR20020060854A - Refrigerating cycle with linear compressor and control method of refrigerating cycle with linear compressor - Google Patents

Abstract

PURPOSE: A refrigerating cycle with linear compressor and control method of the same are provided to smoothly work a re-starting of the linear compressor and to prevent inflow of refrigerant that is not condensed. CONSTITUTION: A valve device(50) comprises a solenoid valve which is closed when a linear compressor(10) is turned off and opened when the linear compressor starts again and is installed between a condenser(20) and an evaporator(40) to cut off flow of refrigerant when the linear compressor is turned off so as to keep difference of pressure of a high pressure side(condenser side) and a low pressure side(evaporator side) of the linear compressor even when the linear compressor is turned off.

Description

Refrigerating cycle with linear compressor and control method of refrigerating cycle with linear compressor

The present invention relates to a refrigeration cycle, and more particularly to a refrigeration cycle having a linear compressor driven by a resonance mechanism and a control method thereof.

In general, the refrigeration cycle is a process of compression, condensation, expansion, evaporation through the refrigerant is carried out continuously, the products to which the application is a refrigerator, air conditioner, kimchi storage.

As shown in FIG. 1, the conventional refrigeration cycle includes a compressor 1 for sucking and compressing a low pressure refrigerant and discharging the refrigerant at a high temperature and high pressure, a condenser 2 for condensing the refrigerant discharged from the compressor 1, and condensation. The expansion device 3 is decompressed so that the refrigerant is easily evaporated, and the evaporator 4 generates cold air while the refrigerant is vaporized. These refrigeration cycle components are configured in a closed loop through the refrigerant pipe.

Therefore, when the compressor 1 is driven, the low pressure refrigerant, which has been evaporated in the evaporator 4, is compressed to a high pressure gas state and transferred to the condenser 2 side. And the high-pressure gaseous refrigerant is condensed while passing through the condenser 2, the pressure is reduced to the evaporation pressure passing through the expansion device (3). Subsequently, the refrigerant is evaporated in the evaporator 4 and heat-exchanges with air to generate cold air, and the low pressure refrigerant, which has been evaporated, is sucked back into the compressor 1.

Compressor (1) of the refrigeration cycle components such as to suck the refrigerant evaporated in the evaporator (4), compresses to high temperature and high pressure, and then continues to send to the condenser (2) side, typically a reciprocating compressor And rotary compressors or linear compressors.

In the case of the refrigeration cycle using the conventional reciprocating type and rotary compressor, the pressure on the high pressure side (condenser side) and the low pressure side (evaporator side) was balanced to turn off the compressor. However, the linear compressor has a pressure difference between the high pressure side and the low pressure side in order to smoothly start the product. However, when the linear compressor is turned off, the pressure difference between the high pressure side and the low pressure side is lost.

That is, in the case of a refrigeration cycle in which a linear compressor is applied, when this is turned off, the pressure difference between the high pressure side (condenser side) and the low pressure side (evaporator side) gradually disappears as the high temperature and high pressure refrigerant in the condenser flows into the evaporator in a non-condensed state. . As a result, the pressure on the high and low pressure sides becomes equal before restarting the linear compressor.

When the linear compressor is restarted in such a state, the high-pressure, high-temperature refrigerant flows into the evaporator in a non-condensed state, thereby lowering the refrigeration cycle efficiency. In addition, the linear compressor is characterized by being driven by a resonance spring for doubling the reciprocating force of the piston and a resonance mechanism due to the difference between the high pressure and the low pressure, and a predetermined pressure difference occurs between the high pressure side and the low pressure side during its restart. There is a problem in that the resonance is delayed until it is generated and driving current is required to move the piston only by the resonance spring.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and an object of the present invention is to smoothly restart the linear compressor by cutting off between the high pressure side (condenser side) and the low pressure side (evaporator side) when the linear compressor is turned off. The present invention provides a refrigeration cycle having a linear compressor and a control method thereof capable of preventing the introduction of non-condensed refrigerant.

1 is a schematic view showing a conventional refrigeration cycle.

2 is a schematic view showing a refrigeration cycle to which a linear compressor according to the present invention is applied.

Figure 3 shows the internal structure of the linear compressor applied to the present invention.

* Description of the symbols for the main parts of the drawings *

10. Linear compressor 20. Condenser

40. Evaporator 50. Valve device

Refrigeration cycle with a linear compressor to achieve this purpose;

The refrigerating cycle includes a linear compressor that doubles the reciprocating force of the piston by the resonant spring, compresses and discharges the refrigerant, a condenser that condenses the refrigerant discharged from the linear compressor, and an evaporator that generates cool air by vaporizing the refrigerant condensed in the condenser. In

Between the condenser and the evaporator is characterized in that the valve device for blocking the refrigerant flow when the linear compressor is off.

In addition, the control method of the refrigeration cycle with a linear compressor;

The resonant spring doubles the reciprocating force of the piston to compress and discharge the refrigerant, a condenser for condensing the refrigerant discharged from the linear compressor, an evaporator for generating cold air as the refrigerant condensed in the condenser, and a condenser and evaporator. In a refrigeration cycle having a valve device disposed between,

When the linear compressor is turned off, the valve device is closed to shut off the refrigerant flow between the condenser and the evaporator.

When the linear compressor is started, the valve device is characterized in that the opening operation.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Briefly, the accompanying drawings, Figure 2 schematically shows a refrigeration cycle according to the invention, Figure 3 shows the internal structure of the linear compressor applied to the present invention.

As shown in FIG. 2, the refrigeration cycle according to the present invention uses a linear motor to compress and discharge the refrigerant at high temperature and high pressure, and the high pressure refrigerant in the gas state discharged from the linear compressor 10. A condenser 20 for removing heat and condensing, an evaporator 40 having an expansion device 30 disposed upstream such that the refrigerant condensed in the condenser 20 flows while reducing the evaporation pressure, and the condenser 20 It is arranged between the evaporator 40 and has a valve device 50 for controlling the refrigerant flow. The linear compressor 10, the condenser 20, the valve device 50, the evaporator 40 and the like are connected to the closed circuit through the refrigerant pipe.

Referring to FIG. 3, the linear compressor 10 includes a linear motor 13 that generates power in the sealed container 11, and a compression device 12 that receives power from the linear motor 13 and sucks and compresses refrigerant. Include.

The compression device 12 includes a cylinder block 12b having an compression chamber 12a provided in an axial direction therein, and a suction block 12c coupled to an upper portion of the cylinder block 12b to guide the suction and discharge of the refrigerant. The cylinder head 12e in which the discharge chamber 12d is formed is included. In addition, the compression chamber 12a is provided with a piston 12f which reciprocates by the interlocking of the magnet 13c described later.

The linear motor 13 is arranged to surround the cylinder block 12b, which is provided to be spaced apart from the outside of the cylinder block 12b by a predetermined distance, and the core 13b wound around the coil 13a to form a magnetic field when power is applied. And a magnet 13c disposed between the core 13b and the cylinder block 12b.

The core 13b is formed by stacking a plurality of electrical steel plates, and upper and lower sides thereof have a frame portion 12g extending outwardly on an upper portion of the cylinder block 12b, and a fixed frame 12h fixed thereto through a bolt 14. Supported by).

The magnet 13c interacts with the magnetic field formed in the core 13b to linearly reciprocate, which is connected to the piston 12f through the connecting rod 15. As a result, the piston 12f reciprocates the compression chamber 12a together with the reciprocation of the magnet 13c.

The compression device 12 and the linear motor 13 are supported by the coil spring 16 and the resonant spring 17. That is, the coil spring 160 for elastically supporting the cylinder block 12b at the bottom of the sealed container 11 is disposed in the spacer 18 provided at the lower end of the fixed frame 12h to hold the position of the piston 12b. And the resonant spring 17 is a kind of leaf spring, the center of which is the end of the piston 12f is fastened and the edge is fixed to the spacer 18. Thus, the resonant spring 17 in the direction of the arrow with the piston 12f It resonates and doubles its reciprocating force.

On the other hand, the valve device 50 (see Fig. 2) is for blocking the refrigerant flow between the high pressure side (condenser 20 side) and the low pressure side (evaporator 40 side) of the refrigeration cycle when the linear compressor 10 is off. will be. To this end, the valve device 50 is disposed in the middle of the refrigerant pipe connecting the condenser 20 in which the high pressure refrigerant is present and the evaporator 40 in which the low pressure refrigerant is present. It consists of a solenoid valve which is open and closed when it is off.

That is, the valve device 50 is maintained in a closed state when the linear compressor 10 is turned off, and is composed of a normally closed solenoid valve that is kept open by being supplied with power.

Therefore, when the linear compressor 10 is restarted, since the refrigerant in a state where the pressure difference between the high pressure side (condenser side) and the low pressure side (evaporator side) is maintained is supplied to the linear compressor 10 side, the restart thereof is restarted. This is done more smoothly, which is described in more detail in the control method.

Next, the control method of the refrigeration cycle configured as described above and the effects thereof will be described.

First, when a power supply is supplied to the linear compressor 10 in the control unit (not shown) of the product to which the refrigeration cycle is applied, it detects this and also applies power to the valve device 50 to maintain the open state. When a magnetic field is formed in the periphery of the core 13b of the linear compressor 10 in this state, the magnet 13c linearly reciprocates by the electromagnetic interaction between this and the magnet 13c. In addition, the piston 12f connected through the magnet 13c and the connecting rod 15 reciprocates through the compression chamber 12a. The piston 12 is formed by the elastic restoring force of the coil spring 16 and the resonance spring 17. 12f) and the reciprocating force of the magnet 13c is doubled.

Therefore, when the piston 12f moves to the bottom dead center, the refrigerant is sucked from the suction chamber 12c to the compression chamber 12a. When the piston 12f moves to the top dead center, the refrigerant in the compression chamber 12a is compressed to a high-pressure gas state and discharge chamber. It is discharged to 12d and supplied to the condenser 20 side.

In addition, the high pressure gas refrigerant entering the condenser 20 is discharged to the outside and condensed, and is sent to the expansion device 30 through the valve device 50 which is opened. Decompression Subsequently, the refrigerant which has been decompressed is introduced into the evaporator 40, where it is evaporated and heat exchanged with air to generate cold air. And the vaporized refrigerant is returned to the linear compressor 10 to be compressed again, the refrigerant circulation is made continuously.

On the other hand, when the linear compressor 10 is turned off, that is, a signal for stopping the start is input to the controller, the valve device 50 is also cut off to maintain the power supply. As a result, communication between the condenser 20 and the evaporator 40 is interrupted, whereby the pressure difference between the inlet side and the outlet side of the linear compressor 10 is maintained as it is.

That is, in the state where the linear compressor 10 is stopped, the high pressure refrigerant in the condenser 20 is prevented from flowing to the evaporator 40 side, whereby the pressure difference is maintained between the high pressure side and the low pressure side.

When the linear compressor 10 is restarted in such a state, the control unit immediately opens the valve device 50 so that the condenser 20 and the evaporator 40 communicate with each other. Therefore, the high-pressure refrigerant in the state condensed completely in the condenser 20 is transferred to the evaporator 40 via the valve device 50 and the expansion device 30, thereby improving the heat exchange efficiency of the evaporator 40.

In addition, the linear compressor 10 is driven by the resonance mechanism due to the pressure difference between the resonance spring 17 and the high pressure side (condenser 20 side) and the low pressure side (evaporator 40 side) due to product characteristics. When the restart thereof, the pressure difference between the high pressure side and the low pressure side is maintained as it is, so that the restart is smoothly performed. That is, the pressure difference between the high pressure side and the low pressure side becomes a driving force for resonating the resonant spring 17, whereby the initial drive current for driving the resonant spring 17, the piston 12f and the magnet 13c is small. It takes

On the other hand, this technical idea has been described as opening the valve device 50 with the restart of the linear compressor 10, but is not limited to this, the valve device 50 with a certain time interval after restarting the linear compressor 10. The desired purpose of the present invention can also be achieved by opening the c).

As described in detail above, according to the refrigeration cycle with a linear compressor according to the present invention and a control method thereof, a valve device for blocking between the high pressure side (condenser side) and the low pressure side (evaporator side) when the linear compressor is turned off The pressure difference between the high pressure side and the low pressure side is maintained as it is even when the linear compressor is turned off.

Accordingly, when the linear compressor is restarted, the pressure difference between the high pressure side and the low pressure side makes the initial driving more smoothly, thereby reducing the power consumption, and the refrigerant in the fully condensed state is transferred to the evaporator side. There is an effect that heat exchange efficiency is further improved.

Claims (3)

Refrigerant with a linear compressor in which the reciprocating force of the piston is doubled by the resonant spring to compress and discharge the refrigerant, a condenser in which the refrigerant discharged from the linear compressor is condensed, and an evaporator in which the refrigerant condensed in the condenser is vaporized to generate cold air. In the cycle, And a valve device disposed between the condenser and the evaporator to block a refrigerant flow when the linear compressor is turned off. The method of claim 1, The valve device is a refrigeration cycle having a linear compressor, characterized in that made of a solenoid valve which is closed when the linear compressor is turned off and opens with restart of the linear compressor. A linear compressor in which the reciprocating force of the piston is doubled by the resonance spring, and the refrigerant is compressed and discharged, a condenser in which the refrigerant discharged from the linear compressor is condensed, an evaporator in which the refrigerant condensed in the condenser is vaporized, and generates cold air; In a refrigeration cycle with a valve arrangement disposed between the condenser and the evaporator, Closing the valve device to shut off the flow of refrigerant between the condenser and the evaporator when the linear compressor is turned off, A refrigeration cycle control method with a linear compressor, characterized in that for opening the valve device when the linear compressor starts.