KR100608670B1 - Driving control apparatus and method for reciprocating compressor - Google Patents

Abstract

The present invention relates to an operation control apparatus and a method of a reciprocating compressor, in the case of a compressor capacity reduction operation, the control of the piston stroke by the control current flowing in the main winding during suction, and the control current flowing in the main winding during compression By controlling the stroke of the piston with a direct current flowing through the auxiliary winding, the center of movement of the piston is moved to the top dead center to prevent compression loss and re-expansion loss. To this end, the present invention provides a driving control apparatus for a reciprocating compressor in which a commercial AC power is phase controlled by a triac and applied to a reciprocating compressor, the main winding driving a motor by a control current applied through the triac; A diode and a sub winding winding the commercial AC power supply and driving the motor by the rectified DC current; If the current operation mode is a capacity reducing operation, it outputs a switching control signal for selecting the diode and the sub winding, and controls the piston to reach the top dead center by using the DC current and the control current generated in the diode and the sub winding. A microcomputer; And switching means for switching by the switching control signal to apply a commercial AC power supply to the sub windings.

Description

Operation Control System and Method of Reciprocating Compressor {DRIVING CONTROL APPARATUS AND METHOD FOR RECIPROCATING COMPRESSOR}

Figure 1 is a block diagram showing the configuration for the operation control device of a typical reciprocating compressor.

FIG. 2 is a diagram showing a piston stroke in reducing compressor capacity in FIG. 1; FIG.

Figure 3 is a circuit diagram showing a configuration for the operation control device of the reciprocating compressor of the present invention.

Fig. 4 is a diagram showing the piston stroke at the time of reducing the compressor capacity in Fig. 3;

5 is an operation flow chart for the operation control method of the reciprocating compressor of the present invention.

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

10: electric circuit unit 20: current detection unit

30: voltage detector 40: microcomputer

L1: Main winding L2: Sub winding

D1: Diode

The present invention relates to an operation control apparatus and a method of a reciprocating compressor, in particular, in the case of a compressor capacity reducing operation, controlling the stroke of the piston by a control current flowing in the main winding when inhaling, and controlling the flow in the main winding during compression. The present invention relates to an operation control apparatus and method for a reciprocating compressor in which a stroke of a piston is controlled by a current flowing in an auxiliary winding, thereby moving the piston's center of motion to a top dead center to prevent compression loss and re-expansion loss.

In general, when a reciprocating compressor is used in a refrigerator or an air conditioner, the compression ratio of the reciprocating compressor can be varied by varying the stroke voltage input to the reciprocating compressor. (Freezing Capacity) can be controlled.

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1 is a block diagram showing a configuration of an operation control device of a general reciprocating compressor. As shown in FIG. 1, the piston changes the stroke in vertical motion by the voltage applied to the internal motor according to the stroke command value. A reciprocating compression unit (L.COMP) for adjusting; A voltage detector (30) which detects a voltage generated in the reciprocating compression section (L.COMP) as the stroke is increased by an applied voltage; A current detector 20 which detects a current applied to the reciprocating compressor L.COMP as the stroke is increased by an applied voltage; A microcomputer (40) for calculating a stroke from the voltage and current detected from the voltage detector (30) and the current detector (20), comparing the stroke with a stroke command value, and outputting a switching control signal according to the stroke command value; In accordance with the switching control signal of the microcomputer 40, it consists of an electrical circuit section 10 for interrupting the AC power to the triac (Tr1) to apply a voltage to the reciprocating compression section (L.COMP), and thus The operation of the conventional apparatus will be described.

First, the reciprocating compression section (L.COMP), the piston is moved up and down by the applied voltage according to the stroke command value set by the user, thereby the stroke is variable to adjust the cooling force.

Meanwhile, the stroke of the triac Tr1 of the electric circuit unit 10 is increased due to a long turn-on period due to the switching control signal of the microcomputer 40, wherein the motor M of the reciprocating compressor L.COMP is increased. The voltage and the current applied to the) are detected by the voltage detector 30 and the current detector 20, and applied to the microcomputer 40.

Then, the microcomputer 40 calculates a stroke using the applied voltage and current detected from the voltage detector 30 and the current detector 20, and compares the stroke with the stroke command value and accordingly switches the control signal. Outputs

That is, when the calculated stroke is smaller than the stroke command value, the microcomputer 40 outputs a switching control signal for lengthening the on-cycle of the triac Tr1, thereby converting the voltage applied to the reciprocating compressor L.COMP. Increase.

Unlike the above, when the calculated stroke is larger than the stroke command value, the microcomputer 40 outputs a switching control signal for shortening the on-cycle of the triac Tr1 and is applied to the reciprocating compression unit L.COMP. Reduce the voltage.

In the above-described conventional reciprocating compressor, the capacity of the compressor is varied by controlling the stroke of the piston by changing the magnitude of the voltage across the motor through phase control, where the voltage control angle for controlling the triac during compression or suction is Similarly, when the compressor capacity is reduced, there is a problem in that compression loss and re-expansion loss occur as shown in FIG.

The present invention has been made to solve the above problems, in the case of compressor capacity reduction operation, the control of the stroke of the piston by the control current flowing in the main winding during suction, and the control current and auxiliary flow in the main winding during compression It is an object of the present invention to provide an operation control apparatus and method for a reciprocating compressor in which the piston's stroke is controlled by a direct current flowing in a winding to move the piston's center of motion to a top dead center to prevent compression loss and re-expansion loss.

The present invention for achieving the above object is, as the operation control device of the reciprocating compressor is applied to the reciprocating compressor is phase-controlled by a commercial AC power supply,
A main winding driving the motor by a control current applied through the triac;
A diode and a sub winding winding the commercial AC power supply and driving the motor by the rectified DC current;
If the current operation mode is a capacity reducing operation, it outputs a switching control signal for selecting the diode and the sub winding, and controls the piston to reach the top dead center by using the DC current and the control current generated in the diode and the sub winding. A microcomputer;
And switching means for switching by the switching control signal to apply a commercial AC power supply to the sub-winding.

The present invention for achieving the above object, as a driving control method of the reciprocating compressor which is operation controlled through the phase control of the voltage applied to the reciprocating compressor,
A first step of applying a control current to the reciprocating compressor through a main winding when the current operation mode is 100% capacity operation of the compressor;
While operating the reciprocating compressor at 100% capacity operation of the compressor, when the compressor capacity reduction operation occurs, the control current generated through the main winding and the DC current generated through the auxiliary winding are applied to the reciprocating compressor. Characterized in that the second process.

Hereinafter, with reference to the accompanying drawings the operation and effect of the operation control apparatus and method of the reciprocating compressor according to the present invention.

Figure 3 is a circuit diagram showing the configuration of an embodiment of the operation control device of the reciprocating compressor of the present invention.

As shown in Fig. 3, the general configuration of the present invention is the same as that of Fig. 1, except that the main winding L1 drives the motor by a control current applied through the triac Tr1; A sub winding L2 for driving the motor by DC current when the driving capacity is reduced; A microcomputer outputting a switching control signal for selecting the sub-winding L2 when the current operation mode is a capacity reducing operation; A switch SW that is switched by the switching control signal and applies AC power to the sub winding L2 is further configured, and the operation of the present invention will be described.

First, when the compressor capacity 100% operation is selected by the user. The microcomputer turns off the switch SW connected to the sub winding L2 so as to apply a motor voltage through the main winding.

In this case, a relay may be used instead of the switch SW.

Accordingly, the main winding L1 drives the motor by the control current applied through the triac Tr1.

In this way, when the motor is driven by the main winding L1, and the operation mode of the compressor is changed to the capacity reduction operation mode, the microcomputer outputs a switching control signal for connecting the switch to the sub winding. The switch is thus connected to a sub winding.

As a result, an AC power supply rectifies the diode connected in the reverse direction to the sub winding, and a negative DC current is applied. Accordingly, the control current flowing through the sub winding and the control current flowing through the main winding are applied to FIG. 4. As shown, the center of motion of the piston moves to the top dead center side.

That is, in the case of the capacity reduction operation, the piston reaches the top dead center by the control current flowing through the main winding during the compression stroke of the compressor and the negative DC current flowing through the auxiliary winding, and the suction flow of the compressor flows through the main winding during the compressor stroke. The lower stroke is controlled by the control current.

More specifically, the present invention will be described with reference to Fig. 5, first, when the compressor 100% capacity operation is selected by the user, the motor voltage is applied through the main winding, that is, the motor by the control current interrupted by the triac. Drive.

Subsequently, when the compressor is operated in the compressor 100% capacity operation, and the compressor capacity reduction operation occurs, the motor voltage is applied through the sub winding and the main winding, that is, the control current of the main winding side interrupted by the triac. The motor is driven by the direct current on the sub winding side rectified by the diode.

As shown in Fig. 4, in the compressor capacity reduction operation, the piston is controlled to reach the top dead center by using the control current flowing through the main winding and the direct current flowing through the auxiliary winding in the compression stroke of the compressor, The lower dead stroke is controlled by the control current flowing through the main winding to move the piston's motion center to the top dead center, thereby eliminating the compression loss and the re-expansion loss.

In other words, the present invention controls the stroke of the piston by the control current flowing in the main winding when the compressor capacity is 100% operation, and controls the stroke of the piston by the control current flowing in the main winding and the auxiliary winding during the compressor capacity reduction operation. Eliminate compression loss and re-expansion loss.

The specific embodiments or examples made in the detailed description of the present invention are intended to clarify the technical contents of the present invention to the extent that they should not be construed as limited to these specific embodiments and should not be construed in consultation. Various changes can be made within the scope of.

That is, as described in detail above, the present invention, in the compressor capacity reduction operation, controls the piston to reach top dead center by using the control current flowing through the main winding and the direct current flowing through the auxiliary winding in the compression stroke of the compressor. In the suction stroke of the compressor, the lower dead stroke is controlled by the control current flowing through the main winding to move the piston motion center to the top dead center, thereby eliminating the compression loss and the re-expansion loss.

Claims (4)

An operation control apparatus for a reciprocating compressor in which a commercial AC power is phase controlled by a triac and applied to a reciprocating compressor, A main winding driving the motor by a control current applied through the triac; A diode and a sub winding winding the commercial AC power supply and driving the motor by the rectified DC current; If the current operation mode is a capacity reducing operation, it outputs a switching control signal for selecting the diode and the sub winding, and controls the piston to reach the top dead center by using the DC current and the control current generated in the diode and the sub winding. A microcomputer; And switching means for switching by the switching control signal to apply a commercial AC power supply to the sub-winding. delete An operation control method of a reciprocating compressor which is operation controlled through phase control of a voltage applied to a reciprocating compressor, A first step of applying a control current to the reciprocating compressor through a main winding when the current operation mode is 100% capacity operation of the compressor; While operating the reciprocating compressor at 100% capacity operation of the compressor, when the compressor capacity reduction operation occurs, the control current generated through the main winding and the DC current generated through the auxiliary winding are applied to the reciprocating compressor. Operation control method of the reciprocating compressor, characterized in that the second process. The method of claim 3, wherein the second process comprises: Controlling the piston to reach a top dead center by using a control current flowing through the main winding and a direct current flowing through the auxiliary winding during the compression stroke of the compressor; And a step of controlling the bottom stroke with a control current flowing through the main winding during the suction stroke of the compressor.

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