JPH05280656A - Electric motor-driven valve - Google Patents

Abstract

PURPOSE:To provide a means which can cope with abnormality of action, in the case that it is generated in an electric motor-driven valve, promptly and at a low cost. CONSTITUTION:A valve is constituted such that a factor of its abnormality can be confirmed in a display part 7 by pressing a predetermined alarm display switch 10 by a data memory part 8 of, for instance, EEPROM or the like at the time of generating the abnormality even simultaneously with a power supply off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric valve, and more particularly to a means for coping with an abnormality thereof.

[0002]

2. Description of the Related Art Conventionally, various types of electric valves for controlling flow rate have been widely used in various industries. As is known, this type of electrically operated valve generally
A potentiometer, an encoder, or the like for giving valve opening information was provided, and this fully open / fully closed position information was obtained from each limit switch to control the electric motor power source on / off.

When an operation abnormality occurs in this type of electric valve due to factors such as a rotation abnormality of the valve shaft, a temperature abnormality of the electric motor, a limit switch abnormality, or an abnormality of the valve opening command signal, for example, a countermeasure work is taken. In order to help with the above, there has been conventionally proposed that the abnormality is displayed for each factor by using, for example, an LED (light emitting diode).
If the power is cut off immediately when these abnormalities occur, the contents of the abnormal display will also disappear, so before that, for example, you can see the LED etc. that displays the alarm according to the cause of the abnormality, such as a valve cover. The power source was cut off after checking the cause of the abnormality by looking through the opening formed in the.

[0004]

However, in the above conventional example, the bubble cover or the like has an opening for viewing the LED or the like displaying the alarm display for each factor. Therefore, there is a problem that the waterproof property is lowered, or the cost for the processing or waterproofing is increased.

The present invention has been made in view of the problems of the conventional example as described above, and an object thereof is to provide a means capable of promptly and cost-effectively handling an abnormal operation of an electric valve of this type. I am trying.

[0006]

Therefore, in the present invention, when an operation abnormality occurs in the electric valve, the electric valve is provided with a display means for displaying the cause of the abnormality and an alarm display switch means. Thus, even if the power source is shut off when the abnormality occurs, the abnormality factor is retained in the storage means, and the abnormality factor can be displayed again by operating the alarm display means, thereby achieving the above object. Is to

[0007]

The above-described structure of the present invention is advantageous in terms of waterproofing and cost because it is possible to shorten the maintenance handling time when an abnormality occurs and does not require an opening in the valve cover or the like.

[0008]

EXAMPLES The present invention will be described below based on examples. FIG. 1 shows a schematic block diagram of an embodiment of an electric valve according to the present invention.

(Structure) 1 is an electric motor for driving a valve element of a valve, and 2 is a driver circuit thereof. 3/4 is an open / close limit switch arranged at a corresponding mechanical position so that it is turned off at the fully open / closed position of the valve body, and 5 is a potentiometer for giving the opening position information of the valve body, 6
Is a microcomputer (hereinafter, abbreviated as a microcomputer) for controlling the opening / closing operation of the valve.

Reference numeral 7 denotes a display section using, for example, a 7-segment LED (light emitting diode), etc., for displaying the operation of the valve during automatic adjustment of the potentiometer 5, when there is an overload, or when each of the limit switches 3 and 4 is abnormal. Each is displayed with a predetermined code number or code. 8 is an EEPR for storing voltage data of the potentiometer 5 and the like
A data storage unit such as an OM (electrically erasable ROM) holds data even when the power is turned off. Reference numeral 9 denotes a signal input (for example, 4 to 10 mA) from a DIP (proportional integral / differential type) controller or the like corresponding to a valve opening command signal from the outside.
Current signals, voltage signals of 1 to 5 V, etc.). Also,
Reference numeral 10 denotes an alarm display switch (button) for displaying the cause of abnormality at the time of abnormal stop on the display unit 7 by pressing this when the power is turned on again after abnormal stop of the valve, and 11 indicates an alarm terminal block. .

Various factors such as those described above are considered as factors for the abnormality of the electric valve. These factors include the valve opening command signal 9, the feedback signal from the potentiometer 5, the open limit switch 3 and the close limit switch. Four
The microcomputer 6 can make a determination based on the signal of the above. The feature of this embodiment is that these abnormal factors are displayed on a 7-segment LED or the like in the display unit 7 by a code code for each factor, but since the contents are held in the EEPROM or the like in the storage unit 9, the power source is Even if the switch is turned off, its contents are not erased, and the alarm contents for each cause can be read and confirmed by turning on the power again.

(Operation) FIG. 2 shows a flow chart of a control operation sequence of the alarm processing section. If an abnormality occurs, as shown in subroutine 1, step S
First, the motor 1 is stopped at 1 and an alarm signal is output to the alarm terminal block 11 at step S2. Then step S
In step 3, an alarm is displayed for each cause of abnormality, and in step S4, the alarm data is transferred to the EEPROM of the data storage unit 8.

Normally, when an abnormality occurs in the field, the electric valve is turned off, and the valve body is manually operated to move the valve element to a fully closed or fully opened state to temporarily deal with the problem. Here, the cause of the abnormality will be examined and some processing will be performed. When the power is turned on, an alarm is displayed by the subroutine 1, but the alarm is generated due to a secondary abnormality that occurs when the power is turned on again. Since it may have been displayed, it may not always be the direct cause of the abnormal stop.

Therefore, it is necessary to know the data held in the sub-routine 1 in order to know the abnormality that directly caused it. Therefore, in this embodiment, by pressing the alarm display button 10 shown in FIG. 1 in step S10 of the subroutine 2 after turning the power on again,
If there is alarm data held in step S11 by performing the processing shown in the figure, the direct cause of the abnormality can be determined by reading out the alarm data in step S12 and displaying it on the display unit 7 for several seconds according to the abnormality factor. And then
Delete this alarm data after a few seconds.

On the other hand, if the alarm display button 10 is pressed in step S10 when there is no abnormality and there is no alarm data in step S10, "0" or the like is displayed on the display portion in step S14.

(Other Embodiments) In the above embodiment, the case where the 7 segment LED 7 is used as the display means to notify the user of the alarm according to the factor is shown, but the present invention is not limited to this. It goes without saying that a method of outputting alarm information to the outside using a communication means without any problem may be used.

[0017]

As described above, according to the present invention, even if the power is shut off when an abnormality occurs, the cause thereof can be re-displayed, so that the coping time can be shortened and the opening of the valve cover or the like can be shortened. Therefore, it is advantageous in terms of waterproofing and cost.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an embodiment.

FIG. 2 is a flowchart of a control operation sequence of the alarm processing unit.

[Explanation of symbols]

 1 Electric Motor 3/4 Open / Closed Limit Switch 5 Potentiometer 6 Microcomputer 7 Display (LED) 8 Data Storage (EEPROM) 10 Alarm Display Switch 11 Alarm Terminal Block

Claims (1)

[Claims] 1. When an abnormal operation occurs in the electric valve,
An electrically operated valve having display means for displaying the cause of the abnormality and alarm display switch means, wherein the cause of the abnormality is retained in the storage means even when the power is shut off when the abnormality occurs, and the alarm display is provided. By the operation of the means
An electric valve characterized in that the abnormality factor can be displayed again.