Driving control method for reciprocating compressor

专利摘要:
PURPOSE: A method for controlling operation of a reciprocating compressor is provided to prevent phenomenon that a piston is pushed back by applying fire angle differently in compression stroke and suction stroke under high temperature load condition. CONSTITUTION: A method comprises the steps of: a first step sensing load of a compressor; a second step determining whether the load exceeds reference load; a third step controlling the compressor to work at current asymmetry operation if the load exceeds the reference load; and a fourth step controlling the compressor to work at full stroke operation if the load is under the reference load. The fourth step comprises the steps of: a step reducing stroke during compression stroke without reducing stroke during suction stroke for reducing power consumption; and a step reducing stroke during the suction stroke without reducing stroke during the compression stroke. The stroke is reduce and impressed to a compressor motor during the suction stroke to allow a piston not to be pushed back, and normal stroke is impressed to the compressor motor during the compression stroke to improve efficiency of the compressor.
公开号:KR20030088553A
申请号:KR1020020026208
申请日:2002-05-13
公开日:2003-11-20
发明作者:배규종；신동희
申请人:엘지전자 주식회사；
IPC主号:

专利说明:

DRIVING CONTROL METHOD FOR RECIPROCATING COMPRESSOR}
[6] The present invention relates to an operation control method of a reciprocating compressor, in particular to detect the maximum value and phase angle of the current to asymmetrically control the phase of the current according to the compression stroke and the suction stroke to prevent damage caused by the piston is pushed back. A method for controlling operation of a reciprocating compressor.
[7] In general, the reciprocating compressor has an advantage that it can be used for variable cooling power control by varying the compression ratio as the voltage applied to the motor is variable, refer to the accompanying drawings of the reciprocating compressor. Will be explained.
[8] 1 is a block diagram showing a configuration of an operation control apparatus of a general reciprocating compressor. As shown in FIG. 1, a reciprocating compressor in which a piston changes a stroke in vertical motion by adjusting a stroke voltage according to a stroke command value. (L.COMP); A voltage detector 30 which detects a voltage generated in the reciprocating compressor L.COMP as the stroke is increased by the stroke voltage; A current detector 20 which detects a current applied to the reciprocating compressor L.COMP as the stroke is increased by the stroke voltage; A microcomputer (40) for calculating a stroke from the voltage and current detected by the voltage detector (30) and the current detector (20), comparing the stroke with a stroke command value, and outputting a switching control signal accordingly; In accordance with the switching control signal of the microcomputer 40, it consists of an electric circuit section 10 for interrupting the AC power to the triac (Tr1) to apply a stroke voltage to the reciprocating compressor (L.COMP), and thus The operation of the conventional apparatus will be described.
[9] First, in the reciprocating compressor L.COMP, the piston is linearly moved by the stroke voltage according to the stroke command value set by the user, whereby the stroke is variable to adjust the cooling force.
[10] On the other hand, the triac Tr1 of the electric circuit unit 10 increases the stroke due to the longer turn-on period due to the switching control signal of the microcomputer 40, and at this time, the voltage generated in the reciprocating compressor L.COMP The current is detected by the voltage detector 30 and the current detector 20, and applied to the microcomputer 40.
[11] Then, the microcomputer 40 calculates a stroke by using the voltage and current detected from the voltage detector 30 and the current detector 20, and compares the stroke with the stroke command value, thereby converting the switching control signal accordingly. Output
[12] That is, when the calculated stroke is smaller than the stroke command value, the microcomputer 40 outputs a switching control signal that lengthens the on-cycle of the triac Tr1 to output the stroke voltage applied to the reciprocating compressor L.COMP. Increase.
[13] Here, the stroke control according to the load amount applied to the reciprocating compressor will be described with reference to FIG.
[14] First, in the case of medium temperature load, when the cycle load state of the refrigerator is small, even if the firing angle is kept constant as shown in FIG. 2A, the phase angle change is small and the piston is pushed backward according to the position of the piston (suction stroke and compression stroke). little.
[15] On the other hand, in the case of high temperature load, when the cycle load state of the refrigerator is large, the firing angle is kept constant, so that the maximum current value and the current phase angle change depending on the position of the piston (compression stroke and suction stroke) as shown in FIG. Therefore, the piston is pushed backwards, there is a problem that the piston wear and collision occurs.
[16] That is, the force required for the compression stroke requires the main spring and the refrigerant gas spring, and the force required for the suction stroke requires the main spring. Conventionally, at a high temperature load condition, the compression stroke and the suction stroke do not distinguish between the compression stroke and the suction stroke (same input state). Since the reciprocating motion of the piston is controlled, the stroke stroke of the piston is relatively increased in the suction stroke compared to the compression stroke, and the piston is pushed backward.
[17] The present invention has been made to solve the above problems, and provides a control method of the reciprocating compressor to prevent the piston from being pushed back by applying different firing angle in accordance with the compression stroke and the suction stroke under high temperature load conditions. Has its purpose.
[1] Figure 1 is a block diagram showing the configuration for the operation control device of a typical reciprocating compressor.
[2] 2 is a waveform diagram of an input voltage and an input current according to each load in the operation control method of a conventional reciprocating compressor.
[3] Figure 3 is a flow chart of the operation control method of the reciprocating compressor of the present invention.
[4] FIG. 4 is a waveform diagram showing the variation of the input current with respect to the suction stroke and the compression stroke during overload in FIG. 3; FIG.
[5] Figure 5 is a schematic view showing the movement distance of the piston according to the load in Figure 3;
[18] The present invention for achieving the above object, the first process for sensing the load of the compressor; A second step of determining whether the load is greater than or equal to a reference load; A third step of controlling the current asymmetrical operation if the load is equal to or greater than the reference load; When the load is less than or equal to the reference load, it is characterized in that the fourth process of controlling the entire stroke operation.
[19] The fourth process includes the steps of reducing strokes during compression stroke and reducing strokes during suction stroke by driving to reduce power consumption; The stroke is reduced during suction stroke and the stroke is reduced without stroke during compression stroke.
[20] Hereinafter, the operation and effect of the operation control method of the reciprocating compressor according to the present invention will be described in detail with reference to the accompanying drawings.
[21] First, the present invention, the force required in the compression stroke requires the main spring and the refrigerant gas spring, it is apparent that the force required for the suction stroke, the main spring is required to focus on.
[22] 3 is an operation flowchart of an operation control method of the reciprocating compressor according to the present invention, the first process of sensing a load of the compressor as shown in the drawing; A second step of determining whether the load is greater than or equal to a reference load; A third step of controlling the current asymmetrical operation if the load is equal to or greater than the reference load; When the load is less than or equal to the reference load, a fourth process of controlling the entire stroke operation is made, and thus the operation of the present invention will be described.
[23] Here, since the operation of the general reciprocating compressor is the same as the conventional one, it will be omitted.
[24] First, the load of the compressor is sensed to determine whether the load is greater than or equal to the reference load.
[25] At this time, the load of the compressor is calculated by detecting the current and voltage applied to the compressor or by calculating the stroke applied to the compressor.
[26] As a result of the determination, if the current compressor load is less than or equal to the reference load, a full stroke operation is performed as shown in FIG. 5 (a), and if the current compressor load is greater than or equal to the reference load, current asymmetric operation is performed as shown in FIG. In the current asymmetrical operation, as shown in FIG. 4, the stroke is controlled at the time of compression stroke and suction stroke.
[27] Here, the current asymmetric operation will be described. First, the suction stroke or the compression stroke is sensed by the change of the maximum value and the phase angle of the current.
[28] As a result of the detection, when the suction stroke is detected, as shown in FIG. 5 (b), the firing angle is decreased to reduce the stroke during the suction stroke, and the firing angle is maintained to maintain the original full stroke during the compression stroke. Let's do it.
[29] That is, in the suction stroke, the piston is reduced to be applied to the compressor motor so that the piston is not pushed back, and the normal stroke is applied to the compressor motor in the compression stroke, thereby improving the compressor efficiency.
[30] In other words, according to the present invention, in order to control the stroke operation during the suction / compression of the compressor according to the load, the operation of the current is asymmetric as shown in FIG. To prevent the back of the piston.
[31] 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.
[32] As described in detail above, the present invention has the effect of securing the reliability of the compressor by preventing the piston from being pushed back by applying the firing angle differently according to the compression stroke and the suction stroke under high temperature load conditions.

权利要求:
Claims (2)
[1" claim-type="Currently amended] A first step of detecting a load of the compressor;
A second step of determining whether the load is greater than or equal to a reference load;
A third step of controlling the current asymmetrical operation if the load is equal to or greater than the reference load;
If the load is less than the reference load, the operation control method of the reciprocating compressor, characterized in that performed in a fourth process for controlling the entire stroke operation.
[2" claim-type="Currently amended] The method of claim 1, wherein the third process comprises:
Detecting a suction stroke or a compression stroke with a change in the maximum value of the current and the phase angle;
In the step, the operation control method of the reciprocating compressor comprising a step of reducing the stroke by reducing the firing angle when the suction stroke is detected.

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同族专利:

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公开号 | 公开日

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KR100446774B1|2004-09-01|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2002-05-13|Application filed by 엘지전자 주식회사

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2002-05-13|Priority to KR10-2002-0026208A

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2003-11-20|Publication of KR20030088553A

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2004-09-01|Application granted

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2004-09-01|Publication of KR100446774B1

优先权:

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申请号 | 申请日 | 专利标题

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KR10-2002-0026208A|KR100446774B1|2002-05-13|2002-05-13|Driving control method for reciprocating compressor|