JPH04296270A - Cutoff position deciding device in motor-operated valve - Google Patents

Abstract

PURPOSE:To ensure a valve cutoff as well as to keep of any damage to a valve due to a too-much cutoff of the valve by going only reciprocating motion for simple full-close and full-open automatically as the initial operation. CONSTITUTION:This device is provided with a motor current detecting means 7 in addition to a device monitoring voltage to be generated by this means 11 setting and storing such data as corresponding to a voltage at cutoff time, while a cutoff position is determined by a means 10 comparing and controlling the aforesaid monitor voltage and set storage data and simultaneously it is composed of a means 8 detecting the valve opening and a valve opening control means 1, receiving the detecting signal and a target signal commanding the valve desired opening and controlling the valve opening.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closing position determining device for an electric valve.

0002

[Prior Art] Conventionally, electric limit switches are often used as a means of informing the motor control unit of the fully closed position, that is, the closed position and the fully open position, of the valve of an electric valve, and moreover, the limit switch is adjusted. had no choice but to rely on human hands.

0003

[Problems to be Solved by the Invention] Therefore, in the above-mentioned conventional example, the closing position of the electric valve was manually determined, which caused inconvenience that variations occurred, and furthermore, the closing position of the electric valve was determined by hand. There was a problem with it being damaged. Furthermore, due to insufficient shut-off, there were cases where the valve was not completely closed, and even if the shut-off position was determined, a limit switch was used as a means of detecting the position, making the adjustment work complicated. There was a problem.

[0004] This invention was made in view of the above-mentioned problems, and in addition to the inconveniences such as variations caused by human hands and damage to the valve due to over-closing of the electric valve, there are also problems with the closing of the electric valve. If the valve is not completely closed due to insufficient water, or even if the closing position is determined,
The object of the present invention is to solve problems such as complicated adjustment work caused by using a limit switch as a means for detecting the position.

[0005]

[Means for Solving the Problem] Therefore, in the present invention, a motor current detection means is provided, a monitoring means for monitoring the voltage generated by the current detection means, and data corresponding to the voltage at the time of closing are set and stored. data storage means, comparing means for comparing and controlling the monitor voltage of the monitoring means and setting storage data of the data storage means; and position detection means for detecting the opening degree of a valve driven by a motor; The above object is achieved by comprising a valve opening/closing control means for controlling the opening degree of the valve in response to a detection signal and a target signal instructing the target opening degree of the valve.

[0006]

[Operation] By driving the valve in the closing direction with a motor,
The motor current gradually increases due to valve closure. This current is detected by the motor current detection means, converted into voltage data by the monitoring means, and input to the comparison means.

On the other hand, since voltage data from the data storage means in which data has been set and stored in advance can be similarly input to the comparison means, both data are compared. Therefore, if the motor is brought to a stop position when both data match, the closing position can be obtained by matching both data.

[0008]

[Embodiment] Reference numeral 1 indicates a valve opening/closing control means, which is configured to be able to input a target signal for commanding the target opening degree of the valve 6, and feed back a detection signal from a position detection means 8 capable of detecting the current position of the valve 6. The configuration is such that it can be input as a signal. 2 is a motor control section, and 3 is a motor drive section, both of which are controlled by the output signal from the valve opening/closing control means 1, and are configured to drive the motor 4. Reference numeral 5 denotes a speed reducer, which is rotated by the motor 4 and can drive the valve 6. A position detecting means 8 for the valve 6 is connected to the valve 6, and the output from this means 8 is inputted as a detected value to the valve opening/closing control means 1. Reference numeral 7 denotes a motor current detection means connected to the motor driving section 3, and a monitoring means 9 for monitoring the voltage generated by this means 7 is connected.

Reference numeral 11 denotes data storage means for setting and storing data corresponding to the motor current at the time of shut-off, that is, when the valve is closed, as voltage data. The comparison means 10 compares the voltage with the setting stored data voltage, and transmits the comparison signal to the valve opening/closing control means 1, and transmits an appropriate drive signal to the motor control section 2 and thereafter to move the valve 6 to an appropriate closing position. It can be driven up to.

The operation of this embodiment will be explained based on the above configuration. First, the motor control section 2, motor drive section 3, and motor 4 rotate the valve 6 in the closing direction. Since the valve 6 gradually acts in the closing direction, the motor current gradually increases. This current is detected by the motor current detection means 7, converted into voltage data by the monitor, that is, the monitoring means 9, and input to the comparison means 10. On the other hand, the comparison control section 10 compares data regarding the valve closing voltage that is set and stored in advance and the voltage data that is being monitored.

When both data match, the motor 4 is stopped and the value at this time is set as the valve closing position. and,
The detection value obtained by the position detection means 8 of the valve 6 at this time is stored in the valve opening/closing control means 1 as data of the closing position.

[0012] The above procedure is repeated and realized. Note that data at the closing position of the valve 6 may be secured in the initial operation, but not only during the initial operation but also during normal operation, the current data detected by the motor current detection means 7 can be used to secure the data at the set and stored closing position. If the current data matches the current data, the position data stored in the valve opening/closing control means 1 can be changed at any time.

[0013]

[Effects of the Invention] Since the present invention is constructed as described above, by simply automatically performing a simple reciprocating operation of fully closing and fully opening as an initial operation, the valve can be shut off reliably, and the valve can be prevented from being damaged due to over-closing. In addition to being able to prevent this, deviations in the closing position caused by backlash due to aging in mechanical parts, etc. can be resolved by changing the valve position detection data, so it has the effect of not affecting valve opening control. .

[Brief explanation of the drawing]

[Fig. 1] A Glock diagram showing an embodiment of a closing position determining device for an electric valve according to the present invention.

[Explanation of symbols]

1 Valve opening/closing control means 4 Motor 6 Valve 7 Motor current detection means 8 Position detection means 9. Monitoring means 10 Comparison means 11 Data storage means

Claims (1)

[Claims] 1. A motor current detecting means, a monitoring means for monitoring a voltage generated by the current detecting means, and a data storage means for setting and storing data corresponding to a voltage at a time of shut-off, the monitoring means a comparison means for comparing and controlling the monitor voltage of the monitor voltage with the setting storage data of the data storage means; a position detection means for detecting the opening degree of the valve driven by the motor; and a position detection means for commanding the detection signal and the target opening degree of the valve. A closing position determining device for an electric valve, comprising: a valve opening/closing control means for controlling the opening degree of the valve in response to a target signal.