JPH06190233A - Dust removal control device - Google Patents

Abstract

(57) [Abstract] [Object] In addition to two pressure sensors provided for detecting pressure at the front and rear of a filter as in a conventional dust remover, the present invention further controls the pressure inside the control box. By providing a total of three pressure sensors for detecting, it is intended to more accurately display the air volume of the atmosphere flowing in the main body. [Structure] A fan for sucking and exhausting the atmosphere in the main body, an induction motor for rotating it,
A filter for removing dust passing through the inside of the body, a pressure detecting means for detecting the pressure inside the filter front portion, the filter rear portion, and the inside of the control box, and a pressure value detected by these pressure sensors for the microcomputer computer. Dust removal control characterized by including storage means for storing by means, calculation means for converting the air volume of the atmosphere flowing in the main body based on the stored pressure value, and display means for displaying the same. apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial dust collector.

[0002]

2. Description of the Related Art In a conventional control device, the gauge pressure before and after the filter is detected by two sensors, and the clogging state of the filter is judged by the pressure values, and the operation of pulse jet and the occurrence of alarm are generated. , The air volume was displayed. However, in the control box where the pressure sensor is installed, the wind that changes depending on the dust collection state flows, and when the pressure sensor is affected by this wind, the pressure detection standard of the pressure sensor deviates and an accurate pressure value is displayed. Absent.

[0003]

The above-mentioned prior art has a problem that an accurate gauge pressure cannot be measured due to the influence of the atmosphere flowing in the control box.

An object of the present invention is to overcome the above problems and to accurately measure the pressure before and after the filter regardless of the pressure in the control box.

[0005]

In order to solve the above-mentioned problems, the present invention further comprises a pressure sensor in the control box.
Provide one. Since the pressure inlet of this pressure sensor is directed to the outside of the main body, this pressure sensor measures the pressure difference between the atmospheric pressure and the control box. As a result, the three pressure sensors use the pressure inside the control box as a common reference, and in order to know the accurate gauge pressure before and after the filter (value based on atmospheric pressure), the filter front and rear filters can be used. It suffices to subtract the pressure value in the control box from the pressure value.

[0006]

With the control device of the present invention constructed as described above, the gauge pressure before and after the filter can be accurately measured regardless of the dust collecting state.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an external view of the dust collector body of the present invention. By rotating the fan 3 with the motor 2, air is sucked through the suction port 5 and discharged through the exhaust port 6 through the filter 4. When passing through the filter 4, dust in the air is adsorbed by the filter 4 and the indoor air is cleaned. Further, depending on how much dust is attached to the filter 4 in the dust collector, a pulse jet function of injecting compressed air from the valve 8 to the filter 4 to remove the dust adhering to the filter 4 and store it in the dust box 9 at the bottom, and clogging of the filter There is a function such as an alarm function that displays abnormal piping of the pressure sensor and the pressure sensor, a piping leak, and an air volume display that indicates the air volume flowing in the main body.The operation of these functions is generally based on the pressure before and after the filter. It is determined by the value detected by the sensor and calculated by a predetermined arithmetic expression based on the value or the value.

However, as described above, this pressure sensor has the property that the reference of the gauge pressure is deviated when it receives wind pressure, and the wind flowing inside the main body also flows into the control box 3b having the pressure sensor. Since there is a deviation in the detected value of the pressure sensor, there is no problem in the operation performed based on the value calculated based on these two pressure values, for example, the filter rear pressure-filter rear pressure, but the filter rear It is considered that the execution condition or the timing of execution of the operation performed based on the pressure value itself or the pressure value at the front part of the filter itself is not necessarily appropriate.

Therefore, in order to solve this problem, it is necessary to measure an accurate pressure value based on the atmospheric pressure. For that purpose, in addition to these two pressure sensors, it is necessary to provide another pressure sensor for measuring the pressure inside the control box 3b.

FIG. 2 is a structural view of the vicinity of the filter inside the main body. It is a feature of the present invention that a pressure sensor 3a for measuring the pressure inside the control box 3b is provided in addition to the pressure sensors 1a and 2a attached for measuring the pressure values of the filter rear portion 1b and the filter front portion 2b. Pressure sensor 1a, 2
All of a and 3a are mounted in the control box 3b. The measuring parts by the pressure sensors 1a, 2a are the filter rear part 1b and the filter front part 2b, respectively, as in the conventional case, and the measuring parts by the pressure sensor 3a are outside the main body (atmospheric pressure part). The pressure (gauge pressure) of the filter rear part 1b and the filter front part 2b is set to P1 and P2, respectively, and the pressure (gauge pressure) of the control box 3b in which the pressure sensor is attached is set to Pf.
Then, since the three pressure sensors each show a relative value based on the pressure in the control box 3b, the detected values of the pressure sensors 1a, 2a, 3a are PS1, PS2,
If PS3, then PS1 = P1-Pf PS2 = P2-Pf PS3 = Pf. Therefore, the filter rear part 1b and the filter front part 2b
In order to know the pressures (gauge pressures) P1 and P2 based on the atmospheric pressure of, the PS1 and PS2 should be subtracted from PS3. That is, PS1-PS3 = (P1-Pf) -Pf = P1 PS2-PS3 = (P2-Pf) -Pf = P2. When measuring the pressure values of the filter rear portion 1b and the filter front portion 2b, the calculation may be performed based on this equation.

Next, the actual program operation will be described. FIG. 3 is a circuit diagram of an embodiment of the present invention, and FIG. 4 is a flow chart showing the control means of the present invention in FIG. The operation of the circuit shown in FIG. 3 will be described below according to the procedure of FIG.

The start in FIG. 4 corresponds to a means for turning on the power switch. When the power switch is turned on, the power circuit operates and the microcomputer 30 starts operating.

First, the microcomputer determines whether or not the start switch 31 has been pressed.

When the microcomputer determines that the start switch 31 has been pressed, the microcomputer activates the fan 3. Next, the pressure sensor 1a is used for detection of analog /
It is converted into a digital signal by digital conversion and transmitted to the microcomputer 30. Then, the microcomputer 30 stores this converted value as PS1. Next, detection by the pressure sensor 2a is performed and analog /
It is converted into a digital signal by digital conversion and transmitted to the microcomputer 30. Then, the microcomputer 30 stores the converted value as PS2. Next, the pressure sensor 3a detects the
It is converted into a digital signal by digital conversion and transmitted to the microcomputer 30. Then, the microcomputer 30 stores the converted value as PS3. Next, the microcomputer 30 calculates the actual filter rear pressure P1 = PS1-PS3 and the filter front pressure P2 = PS2-PS3 based on the stored conversion values PS1, PS2, PS3. Furthermore, the pressure difference between the front and rear of the filter (P1-P2) is also calculated. Next, pulse jet generation, alarm generation, and air volume display are performed based on the calculation results. Actually, the generation of the pulse jet is the differential pressure (P1-P2) before and after the filter, and the generation of the alarm is the converted value (PS1 = P1-Pf) of the pressure sensor at the front and rear of the filter, (PS2 = P2-P
f), the pressure difference between the front and rear of the filter (P1-P2), and the air volume are displayed based on the pressure P1 at the rear of the filter. Therefore, in the present invention, the pressure sensor 3a is related to the air volume display.

Therefore, in the present invention, the inside of the control box 3
By installing a pressure sensor to detect the pressure in b, the air volume can be displayed more accurately. Next, it is determined whether or not the stop switch 31 has been pressed. If the stop switch 31 is not pressed, the process returns to step 3. If the stop switch 31 is pressed, the fan 3 is stopped.

Then, the process returns to step 1 again.

[0017]

According to the present invention, the gates at the front and rear of the filter are
Since the air pressure can be measured accurately, the air volume can be displayed more accurately.

[Brief description of drawings]

FIG. 1 is an external view of a dust collector body that is an embodiment of the present invention.

FIG. 2 is an internal structure diagram of a dust collector body which is an embodiment of the present invention.

FIG. 3 is a circuit diagram showing an embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the present invention.

[Explanation of symbols]

1 is a main body, 2 is a motor, 3 is a fan, 4 is a filter, 5
Is a suction port, 6 is an exhaust port, 7 is an operation panel, 8 is a pulse jet air valve, 9 is a dust box, 20 is a pulse jet air injection valve, and 30 is a micro computer.
, 31 is a start switch, 32 is a stop switch, 1a is a filter rear pressure sensor, 2a is a filter front pressure sensor, 3a is a control box pressure sensor, 1b is a filter rear space, and 2b is a filter. The front space, 3b, is inside the control box.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuhiko Yatsushiro 1060 Takeda, Katsuta City, Ibaraki Prefecture Hitachi Koki Co., Ltd.

Claims (1)

[Claims] Claims: 1. A pressure sensor for detecting the pressure in front of a filter in a dust removing device, wherein a fan is rotated by an electric motor, air containing dust is sucked through a suction port, and dust is removed by a filter supported by a main body. A dust removal control device comprising a pressure sensor for detecting the pressure at the rear of the filter and a pressure sensor for detecting the pressure inside the main body.