JP2004360704A - Control device integrated rotary machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device integrated rotary machine capable of reducing the manufacturing cost of a water supply device etc. using a variable speed pump etc. and setting a control program easily at the site of installation. <P>SOLUTION: The control device integrated rotary machine is composed of a rotary machine unit 31 such as a pump, a fan, etc. and the control device 10, wherein the control device 10 is equipped with an inverter to drive the rotary machine unit 31, a memory to store the control program, a CPU 12 to operate in conformity to the program stored in the memory, an input/output part connected with sensors etc. installed in different parts of the rotary machine unit 31, and a means to rewrite the control program stored in the memory, and using a plurality of the control device integrated rotary machines, coordinated operations can be made such as additional parallel-off operation, alternate operation, switching at failure, etc. by making communications between the machines wirelessly. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotary machine integrated with a control device, and more particularly to a control device integrally provided with a rotary machine such as a pump and a fan and various operation control devices such as an inverter device for controlling the rotation speed of the rotary machine. The present invention relates to a body rotating machine.

  By using an inverter device that converts the frequency and voltage of a commercial AC power supply into an arbitrary frequency and voltage for a rotating machine such as a pump and a fan, it is widely performed to operate the rotating machine such as a pump and a fan at a variable speed. I have. Inverter devices can change the rotation speed of the motor that drives the pump or fan arbitrarily, so operating at the optimum rotation speed corresponding to the load of the pump, fan, etc., compared to operating at the rated speed Energy saving can be achieved.

  Also, in various water supply devices, a pressure sensor is attached to the pump discharge side, and a rotation speed signal is sent from the PI control unit to the inverter device so that the detected pressure signal coincides with the pressure set value. 2. Description of the Related Art It is known to perform a constant discharge pressure control operation in which a rotation speed is controlled and a discharge pressure of a pump is controlled to be constant. Further, it is known to perform an estimated terminal pressure constant control operation for controlling the supply water pressure at a terminal consumer to a constant value by appropriately changing the pump discharge target pressure sequentially from a flow rate sensor or a rotation speed.

  In an air conditioner or the like, a temperature sensor is attached to a fan discharge side, and a temperature at which a rotation speed of the fan is controlled by an inverter from an PI control unit so that an air temperature blown by the fan matches a predetermined temperature set value. It is known to perform a constant control operation.

  When a variable speed pump or a variable speed fan having such an inverter is incorporated in a water supply device or an air conditioner, various operation controls are required. For example, when used for a water supply device, the start / stop control of the variable speed pump is performed based on an operation / stop command from a control station located away from the pump. It is also necessary to display these operating conditions. In the case of automatic operation that keeps the discharge pressure constant, the signal of the pressure sensor provided at the pump discharge port is taken into the control device in the water supply device, and the rotation speed is controlled at a variable speed so that the discharge pressure is kept constant. There is a need to. Furthermore, when the amount of water supply, which is the load of the pump, becomes extremely small, the pump operates in a shut-off state, so water is accumulated in the pressure tank provided on the discharge port side of the pump, and the pump is stopped. It is also necessary to perform operation control such as performing.

  Therefore, when a variable speed pump provided with an inverter is also incorporated in a water supply device and used, an operation control device as a water supply device is required, and the operation control device generally uses a CPU and a memory.

However, for example, the specifications of the operation control of a water supply device using a variable speed pump vary widely depending on the conditions of the installation site, and accordingly, the storage contents of the memory that controls the operation of the water supply device are the contents of the equipment at each installation site. Must be set for each. For this reason, a CPU and a memory for controlling the inverter device and a CPU and a memory for controlling the operation of the pump are required, and it is difficult to share these for the above-mentioned circumstances.
In addition, in a water supply device or the like, if the number of facilities is increased or changed due to, for example, an increase in the amount of water supplied, the contents of the memory must be changed accordingly. In such a case, the control contents have conventionally been stored in a ROM or the like, so that this change has not been easy.

  The present invention has been made in view of the above circumstances, and reduces the manufacturing cost of a water supply device or the like using a variable speed pump or the like, and can easily set a control program at an installation site. It is intended to provide a rotating machine.

  The control device-integrated rotary machine of the present invention is a control device-integrated rotary machine including a rotary machine such as a pump and a fan, and a control device, wherein the control device includes an inverter that drives the rotary machine, A memory that stores a program, a CPU that operates according to the program of the memory, an input / output unit that connects to a sensor or the like disposed in each unit of the rotating machine, and a unit that rewrites a control program stored in the memory. It is characterized by using a plurality of rotary machines integrated with the control device, performing wireless communication between the machines, and enabling mutual cooperative operation such as additional disconnection operation, alternate operation, switching at the time of failure, and the like. .

  The memory stores a control program for the inverter and a program for operation control of the rotating machine.

  Further, the memory is a flash memory.

  Also, by using a plurality of rotary machines integrated with a control device and interconnecting the serial ports of each machine, mutual cooperative operations such as additional disconnection operation, alternate operation, switching at the time of failure, etc. are possible. .

  The electronic circuit portion including the memory and the CPU of the control section is molded and sealed with resin.

  According to the rotary machine integrated with a control device of the present invention, since the memory is provided with means for rewriting the storage contents of the memory based on a signal or the like input from a serial port, the control program of the inverter and the start / stop control of the rotary machine are provided in the memory. And an operation program for performing the operation can be written. As a result, two sets of memory and CPU are conventionally required, but only one set is required, and the manufacturing cost of the apparatus can be reduced.

  In addition, since the memory has rewritable means, it can be changed to a control program that matches the operating state of the rotating machine at the installation site, and a set of hardware must be prepared Thus, it is possible to provide a water supply device adapted to various operating conditions by software. This makes it possible to mass-produce the hardware, reduce the manufacturing cost of the device, and, on the user side of the rotating machine, for example, add a pump in response to a change in the demand of the water supply device. In such a case, the change can be easily dealt with, and the flexibility of the system is greatly improved.

  According to the present invention, since the control program for the inverter and the operation control program for the rotating machine can be rewritten via the serial port, operation control corresponding to various installation sites with the same hardware configuration is possible. It is possible to provide a simple rotating machine. Thus, since the hardware may have the same configuration, mass production is possible, and the manufacturing cost can be reduced. Also, since software can be written in the control device at each installation site, a rotary machine capable of performing optimal operation control according to the equipment configuration at the installation site can be provided. Further, even after the installation of the equipment, it is possible to easily change the operation program at the installation site when the equipment is added. In this way, a rotating machine with extremely high flexibility can be provided for the consumer side.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a control device portion of a control device-integrated rotary machine according to an embodiment of the present invention. The control device 10 has an inverter device 20 mounted thereon. The inverter device 20 is a converter unit that rectifies the three-phase AC commercial power input 21. A diode bridge circuit 22; a capacitor 23 for storing and smoothing the DC power rectified by the diode bridge circuit; and an inverter unit for converting the DC power stored in the capacitor into AC power of an arbitrary frequency and voltage. And a power element unit 24. The power element 24 of the inverter device 20 is composed of a power element such as a power MOS or IGBT, and an AC power output of an arbitrary voltage and frequency is formed by opening and closing the power element. Done by The pulse width modulation is performed via the CPU 12 and the driver circuit 13 by the program 11a of the inverter control unit of the rewritable memory 11.

  The control device 10 includes a rewritable memory 11 in which an inverter control program 11a and an operation control program 11b are built, and a CPU 12 which performs an arithmetic control operation based on the programs stored in these memories. Here, in this embodiment, a flash memory is used as the memory 11. Further, the control device 10 is provided with a serial port 14 so that a signal can be taken into the CPU 12 from the outside via a communication line. Further, the serial port 14 is connected to an external interface circuit 15, and the external interface circuit 15 is connected to a pressure sensor or the like for detecting a discharge pressure of a pump in the case of a water supply device, for example, and can take in the signal. Further, the external interface circuit 15 has output signal terminals for switching signals for automatic operation and manual operation of the pump, input signals of sensors for detecting various abnormalities, and displaying various alarms. The auxiliary power supply 16 is an auxiliary power supply for supplying DC power of about 5 V to operate the CPU 12, the serial port 14, and the like, and generates a required low voltage from a DC voltage formed in the capacitor 23 by a DC-DC converter or the like. are doing.

  FIG. 2 is a diagram showing an embodiment of the control device shown in FIG. 1 and is an example used for a water supply device. The water supply device 30 uses a variable speed pump 31 driven by an inverter, and a control device 10 having a built-in inverter is integrally fixed. The control device 10 is housed in a hermetically sealed box body fixed to the casing of the pump 31. In particular, a circuit board on which a CPU, a memory, and the like are mounted is sealed with a mold resin, whereby electronic components due to dew condensation or the like are formed. Malfunction is prevented.

  The suction side of the variable speed pump 31 is connected to, for example, a main water pipe (not shown) via an inflow pipe 32. The discharge side of the variable speed pump 31 is connected through a flow switch 35, a check valve 34, a gate valve 37, and the like to supply tap water to a demand end terminal such as a house by piping. The flow switch 35 is for detecting a small amount of water, and the check valve 34 is a backflow prevention valve for preventing backflow of water from the discharge side to the inflow side when the pump stops.

  A pressure accumulation tank 36 is connected to the discharge pipe 33. When a small amount of water is detected by the flow switch 35, the operation of the variable speed pump is stopped by accumulating the pressure in this tank, and the shutoff operation of the pump is prevented. It is for doing. The discharge pipe 33 is provided with a pressure sensor 38 for detecting the water pressure, and its output signal is input to the control device 10 via the external interface 15. The set value of the discharge pressure or the set value of the supply water pressure at the end of the demand is input to the control device 10, and the control device 10 controls the rotation speed of the variable speed pump 31 so as to reach the target pressure. Various alarms are input to the control device 10. For example, the variable speed pump is provided with a thermometer, and when the temperature of the variable speed pump rises abnormally, the operation is immediately stopped or an alarm is generated. To contact the monitoring station.

  As described above, since the control device 10 incorporates the control program of the inverter and the operation control program of the water supply device, both can be controlled by one control device 10. Further, two variable speed pumps 31 each having the control device 10 are connected in parallel to the inflow pipe 32 and the discharge pipe 33, and their serial ports are connected by a communication line. Accordingly, when one pump runs out of capacity, a second pump is added, and when the capacity of the two pumps is left, one pump is disconnected. It can be performed by an operation program. Similarly, if one pump stops due to a small amount of water, etc., then the other pump starts alternately, or if one pump stops due to a failure, etc., a failure signal is received and the other pump is automatically stopped. A failure switching operation in which one pump is started is also possible. The communication using the serial port can be performed wirelessly.

  FIG. 3 is a diagram showing an embodiment of the control device shown in FIG. 1 and is an example used for an air conditioner. The air conditioner 40 includes a variable speed fan 41, which is controlled by the control device 10. The fan 41 is connected to the inflow duct 42 and the discharge side duct 43, and is for supplying, for example, cooled or heated air to the discharge side, that is, an unillustrated indoor side. For example, a temperature sensor 44 is provided on the discharge side of the fan 41 in order to keep the temperature on the indoor side constant, and the air temperature in the discharge side duct 43 is detected. The set temperature value is input to the control device 10 via the external interface 15 in advance, and the set temperature value is compared with the actually measured temperature of the temperature sensor 44, and the rotation of the fan 41 is adjusted so that the temperatures match. Speed is controlled.

  The rotation speed is controlled by a program of the operation control unit 11b of the memory 11, and the rotation speed is increased or decreased by PI control so that the deviation between the temperature set value and the detected temperature becomes zero. Here, a pulse width corresponding to the rotation speed is given to the rotation speed obtained from the program 11b of the operation control unit by the program of the inverter control unit 11a, and a pulse width modulation signal is output. The pulse width modulation signal turns on / off each power element 24 via the driver circuit 13 and supplies AC power of a required frequency and voltage to the motor.

  Further, although not shown, the fan 41 is provided with, for example, a temperature sensor, and when the fan is abnormally heated, the output of the temperature sensor is taken in through the external interface 15, and is output by the program 11b of the operation control unit. The operation of the fan is stopped or an alarm is output to the outside.

  FIG. 4 shows a configuration example of hardware for rewriting a flash memory. For example, the personal computer 18 is connected via a communication cable 19 to a variable speed pump 31 provided with the control device 10 installed at the installation site. The personal computer 18 and the control device 10 are connected using a cable of a communication standard such as RS232C, for example. The communication cable 19 connects to the serial port 14 of the control device 10. The personal computer 18 stores in advance control programs for water supply devices of various specifications as well as inverter control programs of various specifications, and selects an optimal program according to the equipment configuration at the installation site from the stored programs. The contents are written in the flash memory 11 of the control device 10.

  FIG. 5 shows a flowchart for rewriting the flash memory. First, the flash memory write mode is started. In this state, DC 12 V is applied to the power supply terminal of the CPU in the reset state, and the reset is released. Next, the RAM transfer program is started. Then, a transfer process of the write / erase program is performed. This transfers the program / erase program to the internal or external RAM of the CPU and activates it. Next, the flash memory is erased. In this method, the flash memory is collectively erased for each block area or all areas. Then, the application program is transferred. In this method, the program prepared in advance by the personal computer is transferred to the block area of the flash memory from which the application program has been erased. Next, the application program is started. In this case, the application program is started by releasing the application of 12 V to the power supply terminal of the CPU and performing a reset start.

In the above embodiment, an example in which a flash memory is used as a rewritable memory has been described. However, the gist of the present invention is not limited to a flash memory but may be applied to an electrically rewritable memory such as an E ² PROM. Of course, it can be applied. Although the above embodiment has been described with respect to an example in which a CPU and an electrically rewritable memory are combined, the memory is previously mounted in a socket so that it can be inserted and removed, and a memory corresponding to a change in program contents is prepared. , May be replaced.
Further, although examples of the variable speed pump and the variable speed fan have been described as the control targets of the control device, the gist of the present invention is not limited to these, and a rotating machine whose rotation is controlled by an inverter, and a rotating machine The present invention can be widely applied to a control device for controlling the operation of a vehicle.

FIG. 1 is a block diagram of a control device according to an embodiment of the present invention. Explanatory drawing which shows the example of use of the rotary machine with a control device of one Embodiment of this invention. Explanatory drawing which shows the example of use of the rotary machine with a control device of other embodiment of this invention. FIG. 3 is an explanatory diagram of a hardware configuration for rewriting a flash memory. 9 is a flowchart for rewriting a flash memory.

Explanation of reference numerals

Reference Signs List 10 control device 11 rewritable memory 11a inverter control program 11b operation control program 12 CPU
13 Driver circuit 14 Serial port 15 External interface 16 Auxiliary power supply 20 Inverter device 22 Diode bridge rectifier circuit 23 Capacitor 24 Power element

Claims (1)

A rotary machine such as a pump and a fan, and a control device-integrated rotary machine including a control device,
The control device includes an inverter that drives the rotating machine, a memory that stores a control program, a CPU that operates according to the program of the memory, and an input / output unit that connects to sensors and the like disposed in each unit of the rotating machine. Means for rewriting the control program stored in the memory,
A control device characterized by using a plurality of the control device-integrated rotary machines, performing wireless communication between the respective machines, and enabling mutual cooperative operation such as additional disconnection operation, alternate operation, and switching upon failure. Integrated rotary machine.

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