JPH0742935A - Air supply device for combustion facility - Google Patents

Abstract

PURPOSE:To control a discharge pressure of a blower to a set pressure and to reduce power consumption by arranging a pressure detecting sensor in an air supply passage, obtaining a deviation of the detected pressure from the set pressure, and inputting the deviation to an inverter to control number of revolutions of the blower. CONSTITUTION:A pressure detecting sensor 5 is arranged in an air supply passage 2 to a burning furnace of a blower 1. An air supply pressure is detected by the sensor 5, and this detection signal is input to a deviation output unit 7. On the other hand, the unit 7 obtains a deviation of a pressure input from the sensor 5 from a pressure set by a pressure setter 8, and outputs the deviation to an inverter 9. The inverter 9 so controls to feed back the number of revolutions of the blower 1 based on the deviation as to become a set discharge pressure. Thus, the number of revolutions of the blower 1 is reduced at the time of a low flow rate to reduce power consumption, a flow rate control is simplified, and an air supplying pressure is stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to blowers installed in combustion equipment such as various industrial furnaces and drying furnaces.

[0002]

2. Description of the Related Art A blower installed in a combustion facility such as an industrial furnace has a characteristic that its discharge pressure changes when the flow rate is changed. Therefore, a pressure regulator is installed in a blower path for the purpose of strictly controlling the flow rate. It is attached.

FIG. 2 shows this conventional example, in which 1 is a blower, 2 is a ventilation passage, 3 is a butterfly valve attached to the ventilation passage 2, and 4 is a pressure regulator.

[0004]

However, the above-mentioned conventional air blower has the following drawbacks.

A. Since the rotation speed of the blower is constant, there is no change in power consumption even at low flow rates, which is a problem in terms of energy saving measures.

B. Since the air passage 2 has a large diameter when a large amount of air is blown, the flow rate is adjusted by the butterfly valve 3 in such a large diameter air passage 2, so when the flow rate is low, the pressure regulator 4 is operated by passing through the valve. The secondary pressure becomes high, and as a result, it becomes difficult to accurately adjust the flow rate.

C. Pressure regulator 4 in large diameter air duct 2
In order to improve the controllability of the above, the pressure difference here is required, and therefore the capacity of the blower 1 needs to be set large.

An object of the present invention is to solve the above problems a to c in a blower for a combustion facility.

[0009]

The structure of the blower for combustion equipment according to the present invention is as follows.

A pressure detection sensor is attached to the air passage, a pressure controller compares the air pressure detected by the pressure detection sensor with a set pressure to obtain a deviation, and the deviation is input to an inverter to rotate the fan. The blower for combustion equipment that controls the discharge pressure of the blower to a set pressure by controlling the.

[0011]

[Operation] The pressure in the air passage from the blower to the combustion equipment is
It is constantly detected by the pressure detection sensor. The pressure controller is
The deviation between the pressure detected by this pressure detection sensor and the set pressure is obtained, and the inverter is controlled based on this deviation.
The blower controls the rotation speed by this inverter and the discharge pressure is controlled to the set pressure.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a blower and 2 is a blower path, which leads to a combustion furnace (not shown). Reference numeral 5 is a pressure detection sensor attached to the air passage 2, 6 is a pressure controller, 7 is a deviation output device, 8 is a pressure setting device, and 9 is an inverter for controlling the rotation speed of the blower 1.

In the blower, the pressure detecting sensor 5
Constantly detects the blowing pressure, and the detected value is input to the deviation output device 7. The deviation output device 7 is the pressure detection sensor 5
The deviation between the pressure input from the pressure controller and the pressure set by the pressure setter 8 is calculated, and this deviation is output to the inverter 9.
The inverter 9 feedback-controls the number of rotations of the blower 1 based on the deviation so as to reach the set discharge pressure.

[0014]

The effects of the present invention are as follows.

A. The pressure in the air passage is detected by the pressure detection sensor, the deviation between this detected pressure and the set pressure is calculated, and the inverter speed is controlled using the inverter based on this deviation. Power consumption can be saved by this amount.

B. Since the flow rate of air blown from the blower is constant from stop to rated, it is easy to control the flow rate, especially when blowing to multiple burners, and stabilizes the blow pressure even when the air volume is low. be able to.

C. Since only the pressure detection sensor needs to be attached to the air flow passage, when implementing the present invention, the difficulty in equipment is eliminated.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory view of a conventional blower.

[Explanation of symbols]

 1 Blower 2 Blower 5 Pressure detection sensor 6 Pressure controller 7 Deviation output device 8 Pressure setting device 9 Inverter

Claims (1)

[Claims] 1. A pressure detecting sensor is attached to an air blowing passage, a pressure controller compares a blowing pressure detected by the pressure detecting sensor with a set pressure to obtain a deviation, and the deviation is input to an inverter to output the deviation of the blower. By controlling the rotation speed,
A blower for combustion equipment that controls the discharge pressure of the blower to a set pressure.