JP2003278941A - Positioner with lighting function for valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To arrange a lighting means inside an actuator, and turn on the lighting fixture during maintenance or adjustment, thereby lighting work environment. <P>SOLUTION: This positioner is provided with an angle detection means for detecting an operation opening of a valve, a control means for controlling the actuator for driving the valve based on an opening instruction signal supplied from the outside and the valve opening detected by the angle detection means, and the lighting means for lighting an adjustment and maintenance part such as a control substrate. The adjustment and maintenance part is lit by the lighting means during maintenance. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve positioner, and more particularly to a valve positioner that illuminates an adjustment / maintenance portion during maintenance of the valve.

[0002]

2. Description of the Related Art Conventionally, valves such as butterfly valves have been used for opening and closing of flow paths and controlling fluids in various industrial fields, but they are required to be operated or maintained by a person on a daily basis. Since it is not a device, it is often installed in a high place or a dark place where it does not interfere with the movement of people or objects or the installation of other devices. When performing adjustments and maintenance of valves and actuators, detailed work using precision tools such as precision screwdrivers is required, so there is a possibility that adjustment parts and numerical values may be misunderstood in the dark or at night. , Need a lighting means such as a flashlight. However, the use of the flashlight hinders the work because one hand is blocked, so it was necessary to find a means for fixing the flashlight at the maintenance site. There is also a head-mounted type lighting means, but since it is lighting from above, many shadows are generated and workability is poor. The actual situation is that no lighting means suitable for performing maintenance and adjustment of valves and actuators in a dark place or at night has hitherto been proposed.

[0003]

SUMMARY OF THE INVENTION The present invention has an illuminating means arranged inside an actuator so that the illuminating device can be turned on during maintenance or adjustment to illuminate a work environment.

[0004]

In order to solve the above-mentioned problems, means adopted by the present invention are an angle detecting means for detecting an operating opening of a valve, an opening indicating signal sent from the outside and the angle. Control means for controlling the valve drive actuator based on the valve opening detected by the detection means, and adjustment of the control board portion, having a lighting means for illuminating the maintenance site, the adjustment by the lighting means during maintenance, It is characterized in that the maintenance site is illuminated.

A lighting device is provided in the actuator, and a signal for maintenance or adjustment is input to a control circuit to operate the lighting device. The opening or closing of the cover of the actuator is a signal for maintenance or adjustment. In addition, a signal when the cover is opened is input to the control circuit to operate the lighting fixture.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below. The present invention is a control for detecting an operating opening degree of a valve by a detecting means, comparing the detected valve opening degree with an instruction opening degree sent from the outside, and causing an actuator to perform a required opening operation. It is a valve positioner equipped with a means for adjusting the control board, etc. inside the actuator and illuminating the maintenance area during maintenance or adjustment of the actuator to improve workability and achieve reliable work. It is characterized by The illuminating means is preferably a lamp arranged inside the actuator, and operates by detecting a signal indicating that it is during work such as opening / closing of the cover, maintenance or adjustment, by the control means of the positioner. The signal indicating that the operation such as maintenance or adjustment is being performed is, for example, an on / off signal for a micro switch or the like which is activated when the cover is opened or closed.

The illumination means is not limited to the case where it is arranged inside the actuator, and may be any location that illuminates the working environment such as maintenance. In addition, the lighting means,
It is needless to say that it is not limited to a lamp, and may be a lighting fixture such as a light emitting diode (LED). Further, the signal for operating the lighting means is not limited to the signal from a device such as a switch that operates according to the opening / closing of the lid, and the control means may be operated by a signal sent from a maintenance worker. . The angle detecting means is capable of detecting an operating opening of the actuator such as opening / closing or an intermediate opening and outputting an opening signal. For example, an operating angle feedback signal generator of the actuator, a feedback input circuit, an A / D It is composed of a converter. The control means is composed of a judgment circuit and a motor drive circuit, and judges the difference between the opening signal data of the valve actuator input from the angle detection means and the opening instruction signal data sent from the outside, and is required. The control signal is sent to the motor drive circuit to control the actuator.

[0008]

[Embodiment] Referring to FIG. 1, a set value signal of a valve opening is externally input to a set value input circuit (1), converted into a digital signal by a first A / D converter (2), and a judgment circuit is shown. Input in (3). On the other hand, the operation angle feedback signal generator (6) connected to the output shaft (5) of the motor (4) of the valve actuator converts the shaft rotation angle of the motor (4) into an electric signal and outputs the feedback input circuit ( Enter in 7). The angle signal input to the feedback input circuit (7) is the second A / D
It is converted into a digital signal by the converter (8) and input to the judgment circuit (3). In the judgment circuit (3), the second A / D
When it is judged that the signal value from the converter (8) has changed at its maximum sensitivity, it is compared with the signal value from the first A / D converter (2), and when the deviation is more than a certain value, the motor Drive circuit
An operation signal is output to (9) to drive the motor (4), and the drive of the motor (4) is controlled so that the deviation value becomes a certain value or less. As a result, the valve actuator operates following the set value from the outside.

2 and 3 show a valve actuator, in which an illumination lamp (12) and a maintenance switch (13) are arranged in an actuator body (10) whose open surface can be closed by a cover (11). It The maintenance switch (13) is operated in the ON state when the actuator cover (11) is closed, and when the cover (11) is opened for maintenance, the switch (13) is cut off, and the signal is the judgment circuit (3). It is input to and informs that it is in the maintenance state. Judgment circuit
When a signal indicating that the maintenance is being performed is input to (3), the illumination drive circuit (14) operates to turn on the illumination lamp (12) to illuminate the inside of the actuator. A reflection plate (15) is attached to the illumination lamp (12) to regulate the light rays toward the inside of the actuator. Thus, if the actuator cover (11) is opened during maintenance,
Since the inside of the actuator is illuminated, maintenance and adjustment work can be favorably performed in the dark or at night without any problems.

[0010]

According to the present invention, the maintenance and adjustment of the actuator can be reliably performed in a dark place or at night without any trouble, the maintainability is improved, and the maintenance cost is greatly reduced and the working time is shortened. In addition to being able to achieve this, it is possible to shorten the downtime of the equipment in which the valve equipped with the actuator is installed, and improve the operating efficiency of the equipment.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a positioner according to the present invention.

FIG. 2 is a plan view of the actuator with the cover removed.

FIG. 3 is a sectional view of the actuator.

[Explanation of symbols]

(1) Set value input circuit (2) First A / D converter (3) Judgment circuit (4) Motor (5) Output shaft (6) Operating angle feedback signal generator (7) Feedback input circuit (8) Second A / D converter (9) Motor drive circuit (10) Actuator body (11) Actuator cover (12) Lighting lamp (13) Maintenance switch (14) Lighting drive circuit (15) Reflector

Claims (3)

[Claims] 1. A valve driving actuator is controlled on the basis of an angle detecting means for detecting an operating opening of a valve, an opening instruction signal sent from the outside and a valve opening detected by the angle detecting means. A valve positioner comprising a control means and an illuminating means for illuminating the adjustment / maintenance part of the control board part and the like, and illuminating the adjustment / maintenance part by the illuminating means during maintenance. 2. A lighting device is provided in the actuator, and a signal for maintenance or adjustment is input to a control circuit to operate the lighting device.
Positioner for the described valve. 3. The lighting device is operated by inputting a signal when the cover of the actuator is opened or closed as a signal for maintenance or adjustment and inputting a signal when the cover is opened to a control circuit. Positioner for the described valve.