JPS6238215A - Apparatus for detecting clogging of filter - Google Patents

Abstract

PURPOSE:To make it possible to easily confirm the clogging state of a filter, by detecting the clogging of the filter on the basis of pressure difference between both sides of the filter. CONSTITUTION:The pressure difference between both sides of a filter is detected by a pressure sensor and, when said pressure difference reaches a predetermined value or more, an alarm is operated. For example, when an air filter 6 clogs, pressure loss is generated and the pressure in the chamber B of an air tank 7 is lowered. Therefore, the pressure in the chamber of a differential pressure switch 11 being a differential pressure sensor communicated with said chamber B through a pipe 9 is reduced. When the differential pressure acting on a diaphragm becomes larger than the load of a return spring, the diaphragm is displaced and a lead switch is operated. By this method, a display lamp 13a being an alarm means is connected to a power source and lights to detect the clogging of the filter 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a filter disposed in a fluid passage to filter foreign matter, and to a device for detecting clogging of the filter.

(Prior Art) Conventionally, this type of filter is disposed within a fluid passage to filter out foreign substances mixed in the fluid. The filters become clogged with foreign matter that has been filtered out, so the filters are replaced with new ones at appropriate intervals.

However, since the filter is disposed within the fluid passage, the filter must be removed from the fluid passage to check for clogging, which is a complicated operation.

Additionally, there is a problem in that if the filter is not replaced smoothly, the flow rate will be insufficient.

Therefore, it is an object of the present invention to make it possible to easily check the clogging state of a filter.

[Structure of the invention]

(Means to solve the problem) Therefore, the following measures were taken in the present invention.

That is, in a filter disposed in a fluid passage connecting a pressure supply source and a pressure supplied source, the fluid passage pressure on the pressure supply source side of the filter and the pressure supplied source side fluid passage pressure of the filter are a pressure sensor that detects the difference between the pressures of both fluid passages, and an alarm means that is activated when the fluid passage pressure on the pressure source side is lower than the fluid passage pressure on the pressure supply source side by a predetermined pressure value. The purpose is to form a clogging detection device.

(Function) In the present invention, a pressure sensor detects the pressure difference on both sides of the filter, and when the pressure difference exceeds a predetermined value, an alarm is activated. Therefore, when the filter becomes clogged, pressure loss increases in the filter due to the flow resistance. Therefore, the pressure difference sensed by the pressure sensor increases, and the alarm device is activated.

Activation of the alarm device makes it possible to automatically detect clogging of the filter.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

As illustrated in FIG.
, has an air flow path 14 connecting the air tank 7 and the electronic control device 1. The air supplied from the Niji pump is transferred to the air duct 4. The air is supplied to the electronic control device 1 via the air tank 7 and the air flow path 14, and after flowing through the electronic device main body, is discharged into the atmosphere from the discharge port 12. Thereby, the electronic control device 1 is cooled.

A switching damper 5 is arranged in the air duct 4 to control the air flow rate. Furthermore, an air filter 6 is installed in the center of the air tank.
is attached to the air tank 7, and the inside of the air tank 7 is partitioned by a Gaia air filter 6 into a room A on the air pump side and a room B on the electronic control device side.

A pair of pipes 8 and 9 are attached to the air tank 7. One pipe 8 is connected to room A, and the other pipe 9 is connected to room B.

Both pipes 8 and 9 are communicated with a diaphragm type differential pressure switch 11, respectively. In addition, in the middle of pipe 9,
A pressure regulator 10 is interposed between the room B and the differential pressure switch 1.
Adjust the pressure transmitted to 1.

The differential pressure switch 11 has a diaphragm built into its main body and has two chambers partitioned by the diaphragm. A pipe 8 is connected to one room, and a pipe 9 is connected to the other room. A return spring is arranged in the chamber connected to the pipe 9, and urges the diaphragm toward the chamber connected to the pipe 8 with an appropriately set load. The diaphragm is displaced by the pressure difference between the two chambers, which causes a permanent magnet attached to the diaphragm to move, activating a reed switch attached to the main body.

A reed switch terminal of the differential pressure switch 11 is connected to the display section 13 via a lead wire 15. It is electrically connected to the display lamp 13a via a voltage source (not shown). Therefore, when the reed switch is activated, the indicator lamp 13a lights up.

The operation of the embodiment described above will be explained.

As long as the air filter 6 is not clogged, sufficient air is supplied to the air dunk chamber B, so no pressure loss occurs in the air filter 6. Therefore, the diaphragm of the differential pressure switch 11 to which pressure is supplied via the pipes 8 and 9 is not displaced. The reed switch does not operate and the indicator lamp 13a does not light up.

However, if the air filter 6 becomes clogged, pressure loss occurs. The pressure in chamber B of the air tank 7 decreases. For this reason, the differential pressure switch 1 connected via the pipe 9
The pressure in room 1 decreases. When the differential pressure acting on the diaphragm becomes greater than the load of the return spring, the diaphragm is displaced and the reed switch is activated. As a result, the indicator lamp 13a and the power source are connected, the indicator lamp 13a lights up, and clogging of the filter 6 is detected.

〔Effect of the invention〕

When the filter is clogged, the pressure source side of the filter becomes relatively high pressure.
However, since the pressure is low on the pressure receiving side, the differential pressure therebetween becomes quite large. Therefore, the present invention, which detects filter clogging based on the pressure difference between both sides of the filter, has the advantage that even mild clogging can be detected reliably.

[Brief explanation of the drawing]

The drawing is a perspective view showing an embodiment of the present invention. ■...Electronic control device (pressure supplied side) 6...Air filter (filter) 7...Air tank (fluid passage) 11...Differential pressure switch (differential pressure sensor) 13a...Indication lamp ( Alarm means) A...Room on the air pump side B...Room on the electronic control device side

Claims (1)

[Scope of Claims] In a filter disposed in a fluid passage connecting a pressure supply source and a pressure supplied source, the fluid passage pressure on the pressure supply source side of the filter and the pressure supplied source of the filter are provided. a pressure sensor that detects a source side fluid passage pressure and detects a difference between both fluid passage pressures; and a pressure sensor that is activated when the pressure source side fluid passage pressure is lower than the pressure supply source side fluid passage pressure by a predetermined pressure value. A filter clogging detection device comprising a warning means for detecting.