KR101379109B1 - Compressor - Google Patents

Abstract

The present invention relates to a compressor, and more particularly, to a compressor in which a control unit can receive information of each part such as a power supply unit and a motor to determine whether there is an abnormality in the control unit.

The compressor of the present invention receives an AC power and converts it to generate a DC power, a power supply unit, a motor operating by receiving power from the power supply, the operation of the motor and controlling the driving degree and the information of the power supply or motor information or And a controller for determining whether the power supply unit and the motor are defective or whether the protection operation is necessary according to the information of the stroke of the compressor.

Description

COMPRESSOR

The present invention relates to a compressor, and more particularly, to a compressor in which a control unit can receive information of each part such as a power supply unit and a motor to determine whether there is an abnormality in the control unit.

Figure 1 shows the configuration of the circuit portion of the conventional compressor. The driving circuit 10 includes a power supply unit 11, a motor 12, and a control unit 13. There is also an inspection device 20 that inspects the drive circuit from the outside.

The power supply unit 11 rectifies or converts an AC power supplied from the outside into a DC power source having a voltage (eg, 12V) that can be driven therein. In the case of rectification or conversion, it is possible to perform feedback control in the control unit 13 so as to have a stable voltage or current suitable for the entire driving circuit.

The motor 12 receives DC power from the power supply unit 11 and converts it into power. In the case of a motor used in a reciprocating compressor, after the rotary motor is used, the rotational force can be converted by a mechanical device such as a cam, or a linear motor can be used.

The controller 13 receives an input from an input unit (not shown) such as a keypad, and controls the driving of the motor 12 and the degree of driving. In addition, feedback control may be performed by receiving information such as voltage and current of the power supplied by the power supply unit 11.

As a method of controlling whether or not the motor 12 is driven and the driving degree, the controller 13 first receives information about whether the driving and the driving degree are input from a sensing unit (not shown) or an input unit (not shown), and then relays ( It is possible to adjust the voltage or current applied to the motor 12 by controlling the opening and closing of the circuit applied to the motor 12 by the power supply unit 11 through the other. At this time, the control unit 13 receives the voltage and current of the motor 12, the voltage and current of the power supply unit 11 without a sensor such as a buffer, the reciprocating distance (stroke), etc. of the movable member (not shown) of the compressor This is input through a sensor (not shown).

In the circuit part of the compressor, the following method is used to check that each part functions properly. When designing the power supply 11, the motor 12, and other control circuits, a test point is added. 1, test points are provided at both ends of the power supply unit 11, at both ends of the motor, and at both ends of the motor 12. In order to test the function performance of each part, the external tester 20 needs a value such as a voltage, a current, etc. of the test points T1 to T4, and thus measures it. This is called an input value. The pre-assembly inspection device 20 of each part was inspected by determining whether these measured values (input value 1, input value 2) maintain the normal range. That is, after setting the range of the measured value of the test point when the function of each part is normal, it was examined by determining whether the measured value is out of the range. That is, if the measured value of the test point is within a certain range (normal range), it is determined to be normal, and if it is out of a certain range (normal range), it may be determined that it is not normal. After assembly, the controller 13 may receive the voltage, the current of the motor 12, the stroke of the compressor, etc., and determine whether to perform a protection operation to drive or stop the motor 12. The voltage of the motor 12, the magnitude of the current, and the like may be transmitted to the controller 13 through a simple circuit.

This method is cumbersome to measure externally the voltage or current of the test point for inspection, and it is difficult to perform such inspection when in use.

In order to solve this problem, the present inventors can receive the information of each part necessary for the inspection in the compressor to determine whether the normal operation of the circuit portion and the need for protection operation without external measurement, without the need for external inspection equipment An object of the present invention is to provide a compressor, which can measure whether or not normal operation.

In addition, the compressor of the present invention receives the information of each part necessary for the inspection inside the compressor, so that the external measurement is not necessary, it is possible to determine whether the normal operation of the circuit portion during the operation of the compressor provides a compressor. It aims to do it.

The compressor of the present invention receives an AC power and converts it to generate a DC power, a power supply unit, a motor operating by receiving power from the power supply, the operation of the motor and controlling the driving degree and the information of the power supply or motor information or And a controller for determining whether the power supply unit and the motor are defective or whether the protection operation is necessary according to the information of the stroke of the compressor.

In addition, the information of the power supply and the information of the motor preferably includes the voltage or current of the power supply and the motor.

In addition, when the voltage or current of the power supply unit or the motor is out of the normal range previously stored in the control unit, it is preferable that the controller determines that the circuit of the power supply unit and the motor is defective or that the protection operation is necessary.

In addition, if the voltage or current of the motor is out of the normal range previously stored in the controller for a predetermined time after starting the motor driving, the controller determines that the circuit of the motor is defective and after a predetermined time, the information of the power supply or the information of the motor or the stroke of the compressor. If it is out of the normal range previously stored in the controller, it is preferable to determine that the protection operation.

In addition, the compressor preferably includes a motor state display unit for displaying to the outside whether or not a circuit failure of the motor or a protective operation is required.

In addition, the control unit transmits a control signal corresponding to the information of the power supply or the motor outside the normal range to control the motor status display unit to output whether the protection operation, whether the circuit is defective, the cause of the protection operation. Do.

Compressor of the present invention having such a configuration is able to determine whether the normal operation of the circuit portion without the external measurement by receiving the information of each part necessary for the inspection inside the compressor, it is possible to measure the normal operation without an external inspection device There is an effect of providing a compressor.

In addition, the compressor of the present invention receives the information of each part necessary for the inspection inside the compressor, the external measurement is not necessary, it is possible to determine whether the normal operation of the circuit portion during the operation of the compressor. It is effective to provide.

In the following, the compressor of the present invention is described in detail with the drawings.

If the compressor is largely classified, a reciprocating compressor which compresses the refrigerant while the piston reciprocates linearly inside the cylinder by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder. And, a rotary compressor for compressing the refrigerant while the roller is eccentrically rotated along the inner wall of the cylinder so that a compression space in which the working gas is sucked and discharged is formed between the eccentrically rotating roller and the cylinder. It is divided into a scroll compressor that compresses the refrigerant while the rotating scroll rotates along the fixed scroll so that a compressed space is formed between the orbiting scroll and the fixed scroll. Lose.

Among the reciprocating compressors, in particular, the piston is directly connected to a reciprocating linear motion motor or drive motor, so that there is no mechanical loss due to the motion conversion, thereby improving the compression efficiency, and a reciprocating compressor having a simple structure has been developed.

The compressor of the present invention can be applied to the above-mentioned compressors, in particular to a reciprocating compressor.

Figure 2 shows the configuration of the circuit portion of the compressor of the present invention. The driving circuit 30 includes a power supply unit 31, a motor 32, a control unit 33, a compressor control unit 34, a motor state display unit 35, and the like.

The power supply unit 31 rectifies and converts the AC power supplied from the outside into a DC power source having a voltage (for example, 12V) that can be driven therein. In the case of rectification or conversion, it is possible to perform feedback control in the controller 33 so as to have a stable voltage or current suitable for the entire driving circuit. The DC power rectified and converted by the power supply unit 31 may supply DC power to the compressor control unit 34 or the motor state display unit 35.

The motor 32 receives the DC power from the power supply unit 31 and converts it into power. That is, to those who are familiar with the technical field to which the present invention belongs, the technical configuration that provides the power that the motor 21 can perform the linear reciprocating motion of the piston in the cylinder, etc. is merely a degree that can be easily recognized and the detailed description It is omitted. In the case of a motor used in a reciprocating compressor, after the rotary motor is used, the rotational force can be converted by a mechanical device such as a cam, or a linear motor can be used. The motor 32 receives the control signal from the control unit 33 and adjusts the driving or driving degree.

The controller 33 controls whether the motor 32 is driven and the degree of driving. In a manner in which the control unit 33 adjusts whether the motor 32 is driven or the driving degree, the control unit 33 may transmit the control signal to the motor 32 to control it. Alternatively, the opening and closing of a circuit applied to the motor 32 by the power supply unit 31 may be controlled through a relay or a switch or the like, and the voltage or current applied to the motor 32 may be adjusted. The way of adjustment is possible.

When checking whether the driving circuit operates normally in the compressor of the present invention, the following method may be used. In the prior art, a test point is required in the design process because the inspection device 20 is external, but in the case of the present invention, the control unit 33 measures a value necessary to check whether the driving circuit is normally operated. The test is made by determining whether the measured value is within the normal range. These values include the voltage or current of the motor 32, the voltage or current of the power supply 31, the stroke of the compressor, and the like. These necessary values should be input to the control unit 33, which will be referred to as input values. Such an input value may be input to the controller 33 by a necessary portion (for example, both ends of the motor, both ends of the output of the power supply unit 31, and the like) and a conductor connecting the controller 33. In addition, in the case of the stroke of the compressor, it may be calculated by the position sensor of the piston or the voltage (or counter voltage) and current of the motor 32.

In the present invention, whether the defective state and the protection operation is necessary according to the information of the power supply unit 31 and the information of the motor 32 may be determined as follows. Since the controller 33 is inside the circuit, no test point is required, and the controller 33 may input a value of a voltage or a current into the controller 33. In the controller 33, the reference value of each input value is stored in advance, and the degree of deviation from the reference value is also stored according to each input value. Alternatively, the controller 33 may store the normal range of each input value. When the control unit 33 checks whether the driving circuit is normally operated, whether the value input to the control unit 33 has exceeded the pre-stored deviation from the pre-stored reference value stored in the control unit 33, that is, each input value. This can be determined by whether or not it is within the normal range.

In the compressor of the present invention to check whether or not the circuit is as follows. When the compressor stops and starts operation, there is a standby time of about 2 seconds. After applying a constant current or a constant voltage to the circuit portion including the motor 32 during that time, it is determined whether the output current or output voltage of the motor is within the normal range previously stored in the controller 33. For example, the controller 33 applies a constant voltage to the circuit including the motor 32 during the standby time, so that the voltage between both ends of the motor output is a certain range based on a theoretical value when the circuit is normal. If it is inside, it is not a fault of the circuit itself, and if it is out of a certain range, it can be regarded as a fault of the circuit itself. That is, whether or not the circuit is defective is possible during the standby period when the compressor is stopped and driven. The controller 33 controls to apply a constant voltage to the circuit portion during the standby time, and it should be understood that the normal range of the resulting output voltage is stored in advance.

In the present invention, the compressor determines whether the protection operation is necessary. When the protection operation is required, it can be determined simply by the voltage or current of the motor 32 or the like, the stroke of the compressor, or the like regardless of the standby time. When the controller 33 is configured not to determine whether the protection operation is required during the standby time, it is determined that the circuit is out of the normal range during the standby time, and that the protection operation is necessary when the controller 33 is out of the normal range after the standby time. In this way, it is possible to distinguish whether the circuit itself is defective or needs temporary protection. If it is out of the normal range during the standby time, it is determined that the circuit is bad, and if it is out of the normal range after the standby time, the protection operation is necessary. . Here, it should be understood that the controller 33 has a table for the normal range of the output current or the output voltage during the standby time, the voltage or the current when the protection operation is determined.

In addition, the motor controller 22 applies certain functions that selectively or all apply the values of voltage, current, and stroke, such that the function determines the necessity of performing the protection operation and the cause of the protection operation (type of protection operation or protection). And the cause of the operation and the failure cause) can be displayed, and these functions can be stored and applied. The motor control unit 22 may store such a function as a program such as software.

Therefore, if the input value exceeds the pre-stored normal range during the standby time, a control signal a is sent to the motor status display unit 35. If the input value exceeds the pre-stored normal range after the standby time, a By sending a different control signal to the motor status display unit 35 can be output differently depending on whether the circuit is defective, protection operation. For example, when the voltage of the motor exceeds the normal range, the control signal b is transmitted to the motor status display unit 35, and the motor status display unit 35 may transmit the control signal to the outside through blinking once. . When the current of the motor exceeds the normal range, the control unit 33 transmits a control signal b ′ to the motor state display unit 35, and the motor state display unit 35 transmits it to the outside through two blinks accordingly. Can be. If the stroke of the compressor exceeds the normal range, the control unit 33 transmits a control signal “b” to the motor state display unit 35, and the motor state display unit 35 flashes three times accordingly to thereby externally receive the control signal. I can deliver it. Here, it is to be understood that the controller 33 includes a table for the normal range of the output current or the output voltage during the standby time, the voltage or the current at the time of determining the protection operation, or the stroke.

When the value input to the controller 33 exceeds a pre-stored deviation from the pre-stored reference value in the controller 33, the controller 33 may stop the operation of the motor 32. At this time, the controller 33 may apply a different output signal to the motor status display unit 35 according to the type of input value out of the normal range. As described above, different control signals are transmitted to the motor status display unit 35 according to which input value exceeds the normal range, and the motor status display unit 35 blinks depending on the type of control signal. By varying the flashing time, it is possible to inform the external cause of the protection operation.

The abnormal state can be distinguished according to the type of the value exceeding the pre-stored deviation from the previously stored reference value among the values input to the control unit 33, and the operation of the motor 32 is temporarily suspended according to the distinguished abnormal state. It can also be judged whether or not to continue or to stop. When the operation of the motor 32 is stopped for a certain time, when the abnormal state is solved (e.g., an abnormality due to the overload of the motor), the motor 32 is stopped again and the motor 32 is started again. However, if the abnormal state is not solved even if the operation of the motor 32 is stopped for a predetermined time (for example, disconnection or short circuit such as a circuit), it is necessary to stop the abnormality unless the abnormal state is resolved. It is to be understood that the controller 33 stores the time value at which the operation of the motor 32 is stopped according to the type of the value exceeding the previously stored degree of deviation from the pre-stored reference value among the input values.

The controller 33 may control the entire compressor or may be used in parallel with the compressor controller 34 that controls only the motor part and controls the entire compressor. When the compressor control unit 34 is provided, the compressor control unit receives an input from an input unit (not shown), sends a control signal to the control unit 33, and the control unit 33 may control the motor 32 accordingly. In addition, when the controller 33 determines that the driving circuit does not operate normally, the controller 33 may notify the compressor controller 34. In particular, when there is an input value that is out of the normal range of each input value, the control unit 33 can know which part has an abnormality depending on which input value is out of the normal range. The case is different so that the fault of the circuit itself and the simple abnormality can be distinguished. If it is determined that the circuit itself is defective, the controller 33 may send a control signal to the compressor controller 34.

The compressor controller 34 basically serves to control and manage the entire compressor. For example, a user input is received from an input unit (not shown), the command is transmitted to the control unit 33, and the control unit 33 receives a control signal from the state of the motor 32. When the state of the motor 32 is abnormal, the control unit 33 transmits a control signal corresponding to the compressor control unit 34, and the compressor control unit 34 transmits a control signal to a display unit (not shown) and displays the display unit (not shown). Accordingly indicates an abnormality of the motor. Preferably, the control unit 33 sends a control signal to the compressor control unit 34 only when the circuit is defective, and the compressor control unit 34 displays a control signal corresponding to the circuit defect when the control signal corresponding to the circuit defect is transmitted. The display unit (not shown) may display a circuit defect to the outside.

If the control unit 33 is designed to control the entire compressor, the compressor control unit 34 is not necessary, and an input unit (not shown) sends a control signal to the control unit 33 and the control unit 33 transmits a control signal. The display unit (not shown) may be configured to display the input state and whether it is in normal operation.

The motor state display unit 35 serves to display that the driving circuit does not operate normally in accordance with a control signal applied by the controller 33. In particular, when there is an input value out of the normal range of each input value, the controller 33 may apply a different control signal to the motor status display part 35 depending on which input value is out of the normal range. The display unit displays the number of flashes or the flashing time differently according to the control signal, so that the user can find out which part is abnormal in the driving circuit even when the motor status display unit 35 reports. In addition, since a method for inspecting a defect in the circuit itself is also distinguished, it is possible to determine whether a protection operation is necessary or whether the circuit itself is defective. The motor status display unit 35 may be an LED or an LCD.

3 is a flow chart illustrating that the control unit inspects the driving circuit among the driving circuits of the present invention compressor.

In step S11, the controller 33 determines whether an input value received from the power supply unit 31 or the motor 32 is within a normal range previously stored in the controller 33. If all of the input values are within the previously stored normal range, it is determined that the driving circuit operates normally, and the flow goes to step S12. If none of the input values are within the normal range, it is determined that the driving circuit does not operate normally, and the flow goes to step S13. Here, whether the input value input from the power supply unit 31 or the motor 32 is within the normal range previously stored in the controller 33 is determined by a constant current or a constant current in the power supply unit 31 or the motor 32 during the standby time. After the voltage is applied, it includes whether the output current or output voltage of the specific port at that time is within the normal range previously stored in the controller 33. Therefore, both the case where the protection operation is required and the case where the circuit itself is defective are moved to step S13.

In step S12, the control section 33 determines that the drive circuit operates normally, so the compressor operates. In detail, the power supply unit 31 or the motor 32 operates under the control of the control unit 33. Even if the control unit 33 determines that the driving circuit is operating normally, it is necessary to go to step S11 periodically and check whether the driving circuit is operating normally. Going to step S11 may be designed to go to step S11 when a predetermined time passes after performing step S12.

In step S13, the control section 33 determines that the drive circuit does not operate normally, so the compressor is stopped. In this case, the controller 33 may determine that the driving circuit operates normally, and may implement the compressor not to operate normally until going to step S12. In this case, the control unit 33 may send a control signal to the motor status display unit 34 according to the type of input value out of the normal range so that the motor status display unit 34 may display the cause of not operating normally. . Preferably, when the circuit itself is defective, the control signal may be sent to the motor status display unit 35 so that the motor status display unit 35 may display the cause of not operating normally.

In step S14, the control section 33 determines that the drive circuit does not operate normally, so it is determined whether the restart condition of the compressor is satisfied. The restart condition may not be determined by the control unit 33 whether the driving circuit is normally operated.

If the control unit 33 determines that the driving circuit does not operate normally because the predetermined input value exceeds the normal range, there is a time value at which the operation previously stored in the control unit 33 is stopped according to the type of the input value exceeding the normal range. This is because when an abnormality occurs in a part related to the motor 32 in the driving circuit, the abnormal phenomenon can be eliminated by stopping the motor 32 for a predetermined time. That is, even if an abnormality occurs in the driving circuit, the circuit abnormality can be eliminated by temporarily stopping the motor 32 without checking or repairing the circuit. Therefore, it is determined whether the operation of the compressor has stopped or the time has passed, and if it has passed this time, it is determined that the restart condition of the compressor is satisfied. When the restarting condition of the compressor is satisfied, the flow goes to step S11 to determine whether there is no error in the driving circuit again. If the abnormality of the drive circuit does not go away even if it is temporarily stopped, it is determined that the restart condition is satisfied without limitation of time, and the flow advances to step S11.

In FIG. 3, the step of determining whether the input value input from the power supply unit 31 or the motor 32 is within the normal range previously stored in the control unit 33 is separated from other steps. If the input value is out of the normal range while driving the compressor (S12), the controller 33 may recognize that it has exceeded the normal range, and through this, it is possible to immediately perform the step (S13). Do.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, such modifications or variations will have to belong to the claims of the present invention.

Figure 1 shows the configuration of the circuit portion of the conventional compressor.

Figure 2 shows the configuration of the circuit portion of the compressor of the present invention.

3 is a flow chart illustrating that the control unit inspects the driving circuit among the driving circuits of the present invention compressor.

Claims (6)

A power supply unit receiving the AC power and converting the same to generate DC power; A motor operated by receiving power from a power supply unit; And A control unit for controlling whether the motor is driven and the driving degree, and determining whether the circuit of the power supply unit and the motor is defective and whether the protection operation is necessary according to the information of the power supply unit or the motor information or the stroke of the compressor; The information of the power supply and the information of the motor comprises a voltage or current of the power supply and the motor. The method according to claim 1, The control unit, if the voltage or current of the power supply or the motor is out of the normal range previously stored in the control unit compressor characterized in that it determines that the circuit of the power supply and the motor or the need for protection operation. 3. The method of claim 2, The controller determines that the circuit of the motor is defective when the voltage or current of the motor is out of the normal range previously stored in the controller for a predetermined time after starting the motor operation, and after a predetermined time, the information of the power supply unit or the motor information or the stroke of the compressor Compressor, characterized in that judged the need for a protective action when out of the normal range. 3. The method according to claim 1 or 2, The compressor comprises a motor status display unit for displaying whether the motor is defective or whether the protection operation is required. 5. The method of claim 4, The control unit transmits a control signal corresponding to the information of the power supply or the information of the motor or the stroke outside the normal range to control the motor status display unit to output the protection operation, whether the circuit is defective, or the cause of the protection operation. Compressor characterized. delete

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