JPH0264329A - Detecting mechanism for filter clogging - Google Patents

Abstract

PURPOSE:To easily find out necessity of filter cleaning, to prevent the occurrence of failure in operation of a device as much as possible, and to enable a filter to be used with amenity by providing a detecting control part to decide necessity of filter cleaning, and a detecting display part to display necessity of filter cleaning. CONSTITUTION:A starting command signal 202 is outputted from a starting command part 51 to a detecting control part 53 so that a clogging state can be displayed. The detecting control part 53 outputs a drive signal 200 to a fan drive part 11 to run a fan 10 at higher speed. Therefore, after temperature in a device 1 is decreased to a low value, it is brought into a steady state. Meanwhile, a temperature change is orderly monitored by a detecting part 52, and a result is transmitted as a temperature signal 201 to the detecting control part 53. When the detecting control part 543 perceives a second steady state, a time required for a change in a state and a temperature difference are measured, and the average speed of a temperature change in a device is calculated. The detecting control part 53 compares it with a temperature-change-in-device speed measured at a point of time when no clogging occurs to a filter 12 held at a registering part 50, and when a result is outside an allowable range, a cleaning demand signal 203 is outputted to a detecting display part 54. The detecting display part 54 displays the need for cleaning when a cleaning demand signal 203 is inputted.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a filter clogging detection mechanism.

In particular, the present invention relates to a filter clogging detection mechanism for checking the clogging state of a filter that partitions the inside of the device from the outside world and prompting the filter to be cleaned, in a device that forcibly exhausts air inside the device by driving a fan.

[Prior Art] Conventionally, with this type of device that uses a fan to forcefully exhaust the air inside the device to maintain a constant temperature inside the device, maintenance personnel look into the filter of the device to check for clogging. A visual check was conducted to determine whether cleaning was necessary.

[Problem i to be solved by the invention] In the conventional device described above, in order to check the clogging state of the fan, the maintenance staff determines the frequency of performing a visual check according to the usage status and usage environment of the device. A visual check was carried out in accordance with this, but although the five-piece work is simple, it requires a large number of man-hours, which has the disadvantage of placing a heavy burden on maintenance workers.

Furthermore, in a system where maintenance personnel are not always present, filter cleaning may be neglected, which may pose a problem in the operation of the apparatus.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and as a means for solving the problems, the filter clogging detection mechanism of the present invention includes a filter that partitions the inside of the device and the outside world, In a forced exhaust device that maintains a constant temperature inside the device, the forced exhaust device includes a fan that is located in the device and forcibly exhausts air inside the device through a filter, and a fan drive unit that drives the fan, and that keeps the temperature inside the device constant. a registration unit that records and holds the rate of change in the temperature inside the device measured by changing the rotational speed of the fan at a time; a start instruction unit that issues an instruction to start detecting the filter clogging; and a start instruction unit that measures the temperature inside the device. The rotational speed of the fan is changed based on the detection start instruction from the temperature detection section and the start instruction section, and the rate of change of the temperature inside the device is calculated based on the temperature measured by the temperature detection section. A detection control unit that determines the necessity of filter cleaning by comparing it with a temperature change rate held in a registration unit, and a detection display unit that displays the necessity of filter cleaning based on a display instruction from the detection control unit. It is structured as follows.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a filter clogging detection mechanism according to an embodiment of the present invention.

The filter clogging detection mechanism of this embodiment includes a filter 12 that partitions the inside of the device 1 and the outside world, a fan 10 that forcibly exhausts the air inside the device 1 through the filter 12, and a fan 1.
0, and is provided for a forced exhaust device that keeps the internal temperature of the device 1 constant.

That is, when the filter 12 is not clogged, the fan 10
a registration unit 50 that records and holds the rate of change in the temperature inside the device measured by changing the rotational speed of the device; a start instruction unit 51 that outputs a start instruction signal 202 as an instruction to start detecting clogging of the filter 12; The temperature detection unit 52 measures the temperature and outputs the temperature signal 201, and the start instruction signal 202 from the start instruction unit 51 is manually inputted as an instruction to start detection, and the rotation speed of the fan IO is changed, and the temperature from the temperature detection unit 52 is After calculating the average rate of change in the temperature inside the device by manually inputting the signal 201, the necessity of cleaning the filter 12 is determined by comparing it with the rate of change in the temperature inside the device at the time when the filter 12 is not clogged, which is held in the registration unit 50. a detection control unit 53 that determines the need for cleaning of the filter 12 and outputs a cleaning request signal 203 if necessary; and a detection display that inputs the cleaning request signal 203 from the detection control unit 53 as a display instruction and displays the necessity of cleaning the filter 12. It is provided with five blocks of section 54.

When the device 1 is powered on, the fan drive unit 11 is energized and the fan 10 rotates at a constant rotational speed (for example, A rotations/minute), so that an airflow 100 is generated. The heated air inside the device 1 is carried out to the outside world by the airflow 100. Therefore, the internal temperature of the device 1 reaches a steady state after falling to a certain temperature.

Now, in order to display the clogging state of the filter 12, it is assumed that an instruction is given from the outside world to the start instruction section 51 to display the clogging state.

The start instruction section 51 outputs a start instruction signal 202 to the detection control section 53. The detection control unit 53 sends a drive signal 20 to the fan drive unit 11 so as to increase the rotation speed of the fan (for example, from A rotations/minute to B rotations/minute).
Send 0.

Since the fan 10 rotates at a higher speed, the airflow 100 increases, and the heated air inside the device 1 is increasingly carried out to the outside world. Therefore, the temperature inside the device 1 falls to a lower temperature and then enters the second steady state.

On the other hand, this temperature change is successively monitored by the temperature detection section 52 and is transmitted as a temperature signal 201 to the detection control section 53. When the detection control unit 53 senses the second steady state, it measures the time required for the state change and the temperature difference, and calculates the average rate of temperature change within the device.

Generally, as the degree of clogging of the filter 12 increases,
Even if the rotational speed of the fan 10 remains the same, the wind speed of the airflow 100 decreases, making it difficult for the heat inside the device to be released to the outside world, and the rate of temperature change decreases.

The detection control unit 53 compares the calculated average rate of change in temperature inside the device with the rate of change in temperature in the device held at the registration unit 50 and measured at the time when the filter 12 is not clogged, and determines whether the rate is within an allowable range. to judge. If it is outside the range, a cleaning request signal 203 is output to the detection display section 54. Note that the value held in the registration unit 50 is determined when the fan 1
This is the rate of change in the temperature inside the device measured by changing the rotation speed of 0 from A (7 minutes of rotation) to B (7 minutes of rotation).

Finally, when the cleaning request signal 203 is input manually, the detection display section 54 displays to the outside world that the filter 12 needs to be cleaned.

[Effects of the Invention] As explained above, the present invention uses a fan to forcefully exhaust the temperature inside the device, and when the device that maintains the temperature inside the device is instructed to start detecting filter clogging, the device automatically performs the following steps: The change in temperature inside the device is measured by changing the rotational speed of the fan, and the degree of clogging is calculated from this speed of change.
We have installed a function that notifies you if cleaning is required.
When instructed to detect filter clogging, a report is automatically made as to whether or not filter cleaning is required, so even non-maintenance personnel can easily know the necessity of filter cleaning. Therefore, the occurrence of failure of the device is minimized and the device can be used comfortably.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a filter clogging detection mechanism according to an embodiment of the present invention. 1: Device 10: Fan 11: Fan drive section 50: Registration section 51: Start instruction section 52: W degree detection section 53: Detection control section 54: Detection display section

Claims (1)

[Claims] A forced exhaust device that maintains a constant temperature inside the device, comprising a filter that partitions the inside of the device and the outside world, a fan that is inside the device and forcibly exhausts the air inside the device through the filter, and a fan drive unit that drives the fan. In the apparatus, a registration unit that records and holds a change rate of the temperature inside the apparatus measured by changing the rotational speed of the fan when the filter is not clogged, and a start unit that instructs to start detecting the filter clogging. an instruction section, a temperature detection section that measures the internal temperature of the device, and a rotation speed of the fan that is changed based on the temperature measured by the temperature detection section according to a detection start instruction from the start instruction section; A detection control unit that determines the need for filter cleaning by calculating the rate of change in internal temperature and comparing it with the rate of temperature change held in the registration unit; and a detection control unit that determines the necessity of filter cleaning based on display instructions from the detection control unit. 1. A detection mechanism for detecting filter clogging, comprising: a detection display section for displaying an error.