JPH0643445U - Damper opening and closing device - Google Patents

Abstract

(57) [Summary] [Structure] A damper switchgear in which an inverter is connected between a power supply and an electric motor. Preferably, a DC power supply is connected between the converter section and the inverter section in the inverter. [Effect] The frequency of failure is low, the power saving property is low, the installation cost is low, and the opening / closing direction and speed of the damper can be freely controlled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a damper opening / closing device, and more specifically, it is possible to open / close the damper at a desired position while controlling the opening / closing direction and opening / closing speed of the damper with less frequency of failure and excellent power saving. The damper opening / closing device.

[0002]

[Prior art]

 Hitherto, for opening and closing the damper, a method of relying on human power or driving or stopping an electric motor by an electro-oil drive machine or a magnetic contactor equipped with a hydraulic pump has been adopted.

However, when relying on human labor, there is an inevitable inconvenience that the cost rise due to soaring labor costs is unavoidable, and when an electro-hydraulic drive machine is used, the circulating oil in the electro-oil drive machine deteriorates. There was also the inconvenience that the frequency of repairs increased due to the inclusion of water and dust in the circulating oil. In addition, the method of driving the electric motor by the electromagnetic contactor is practically unusable because the damper is opened and closed frequently even if it is attached to a device such as a boiler that needs to maintain a constant pipe pressure. In addition, in a device using an electromagnetic contactor, the opening and closing speed of the damper cannot be controlled, and the brake lining of the damper body and the electric motor is overloaded, which shortens the service life of the parts. was there. On the other hand, there was no substitute for the accumulator of the electro-hydraulic drive for opening and closing the damper during a power failure.

[0004]

[Problems to be solved by the device]

 In view of the above circumstances, an object of the present invention is to solve the above problems, to reduce the frequency of failure, to be economical, and to open and close the damper with high accuracy. To provide a device.

[0005]

Means for Solving the Problems The above object is that an inverter is connected between a power source and an electric motor that is a drive source for opening and closing a damper, and preferably, a converter section and an inverter section in an inverter are further provided. This is achieved by a damper switchgear characterized in that a DC power supply is connected between the two.

Hereinafter, a damper opening / closing device of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic view showing a conventional damper opening / closing device using an electric oil drive machine. Electricity supplied from the power source is transmitted to the electro-hydraulic operator 2 via the conventional switch 1. Then, according to an instruction from a separately installed controller 3, a hydraulic servo mechanism is used to open and close the damper 4 as needed until a predetermined angle is reached. During a power failure, the accumulator 15 operates to open / close the damper 4.

FIG. 2 is a schematic view showing a damper opening / closing device of the present invention. In the damper opening / closing device of the present invention, the power supply and the electric motor 5 are connected via the inverter 6 located in the middle of the both. Here, as the electric motor 5, a type in which a motor is equipped with a brake and a speed reducer, which is generally commercially available under the name of "electric actuator", is used. A controller 8 is connected to the inverter 6 via a positioner 7, and the positioner 7 and the electric actuator 5 further detect the actual angle of the damper by an angle detector 9 and the angle detector 9. It is connected via an angle converter 10 for converting the generated angle signal into an electric signal.

In the inverter 6, as shown in FIG. 3, an AC voltage is converted into a DC voltage by the action of the converter unit 11 located between the converter unit 11 and the inverter unit 12 in the inverter 6. It is preferable that a DC power source (battery) 14 such as a dry battery or a storage battery is connected to the portion 13. The DC power source 14 is connected via an electromagnetic contactor (not shown) that is open when energized and closed when a power failure occurs. In the case of the damper opening / closing device in which a DC power source is connected to the inverter 6 as described above, the DC power source can be used as a power source to open / close the damper in an emergency such as a power failure.

Next, the operation of the damper opening / closing device will be described. The electricity supplied from the power source is transmitted to the inverter 6. Then, after being controlled in the inverter 6 according to an instruction from a positioner 7 separately connected to the inverter 6, the electric power is transmitted to the electric operating device 5. By this power transmission, the brake in the electric actuator 5 is first released. Next, the electric motor is driven to open / close the damper 4 while slowly accelerating it to a desired angle. Then, the damper 4 is decelerated immediately before reaching the desired position, and slowly reaches the desired position while decelerating. When the damper 4 reaches the desired position, the electric motor is stopped and then the brake is activated.

Set values such as temperature and pressure are input to the controller 8 in advance. Separately from this, an actual value (hereinafter referred to as a process value) of temperature, pressure, etc. is sensed and detected by a detector (not shown) such as a thermometer, a pressure gauge, etc. and inputted to the controller 8. . Then, the difference between the set value and the process value is sent to the positioner 7. On the other hand, an angle signal indicating the actual angle of the damper detected by the angle detector 9 is converted into an electric signal by the angle converter 10 and then sent to the positioner 7.

Then, from these values input into the positioner 7, that is, the value obtained by subtracting the process value from the set value, the value sent from the angle converter, etc., the damper 4 is required in the positioner 7. The angle is determined, and the determined value is sent to the inverter 6, and the electric power supplied from the power source into the inverter 6 is controlled in the inverter 6 while controlling the opening / closing direction and the opening / closing speed of the electric actuator 5. To drive.

In FIG. 3, arrows a and b show signal paths of voltage control (a) and frequency control (b) in the pulse amplitude modulation (PAM) system, and arrow c shows pulse width modulation. The signal paths for voltage control and frequency control in the (PWM) system are shown.

[0013]

[Effect of device]

 The damper opening / closing device according to the present invention is slightly inferior in response to the conventional damper opening / closing device using the electro-hydraulic drive device, but is equivalent in accuracy and power saving (the conventional method is continuous operation). In contrast, the device of the present invention is intermittently operated), and is excellent in terms of failure frequency, installation cost and installation space.

Further, since the DC power supply is directly supplied to the inverter, it is not necessary to newly install an inverter for returning the DC power supply to the AC power supply, so that the damper switchgear is inexpensive and simple. This is possible, and there is a clear advantage in this respect as well. Further, according to the damper opening / closing device of the present invention, since the opening / closing speed of the damper can be freely controlled by the action of the inverter, an extra burden is not imposed on the damper main body, the brake lining of the electric motor, and the like. Life expectancy can be expected.

[Brief description of drawings]

FIG. 1 is a schematic view showing a conventional damper opening / closing device using an electric oil drive machine.

FIG. 2 is a schematic view showing a damper opening / closing device of the present invention.

[Explanation of Codes] 4 Damper 5 Electric Motor (Electric Operator) 6 Inverter 7 Positioner 8 Controller 9 Angle Detector 10 Angle Converter 11 Converter Unit in Inverter 12 Inverter Unit in Inverter 13 AC voltage is converted to DC voltage Part 14 DC power supply

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[Procedure amendment]

[Submission date] November 12, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Added

[Correction content]

FIG. 3 is a schematic diagram showing a configuration of an inverter of the damper opening / closing device of the present invention.

Claims (2)

[Scope of utility model registration request] 1. A damper opening / closing device, wherein an inverter is connected between a power source and an electric motor that is a drive source for opening / closing the damper. 2. The damper switchgear according to claim 1, further comprising a DC power supply connected between the converter section and the inverter section in the inverter.