JPH05309215A - Fluid device - Google Patents

Abstract

PURPOSE:To properly control washing and cleaning by easily and correctly deciding the state of clogging of a filter, radiator, etc., in advance. CONSTITUTION:In a fluid device, such as a filter and a radiator, a speaker 4 for repeatedly applying pressure is installed in a passage, such as a duct 1 and a pipe and microphones 5, 6 for detecting pressure change in the duct 1 on pressurization by the speaker 4 are installed there. The detected pressure of the microphones 5, 6 is calculated by a logic circuit 7 to detect and decide the clogging of a filter 2, etc., by comparison, etc., with known data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fluid devices such as filters and radiators.

[0002]

2. Description of the Related Art In fluid devices such as filters and radiators, it has been customary to detect the clogging by detecting the flow rate, flow velocity, flow resistance, etc. as signals. There wasn't. Therefore, the performance of the device is deteriorated due to the clogging, and an unexpected trouble occurs.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to easily and accurately determine the clogging state of a filter, a radiator, etc. in advance so that the cleaning and cleaning can be well controlled. ..

[0004]

In a fluid device such as a filter and a radiator, a microphone is provided in which a pressure is repeatedly applied to a fluid passage, and a microphone for detecting a pressure change in the fluid passage at the time of pressurization by the speaker is provided. It is characterized in that the clogging is determined by the pressure detected by the microphone.

[0005]

According to the present invention, as described above, the speaker which repeatedly applies pressure to the fluid passage is provided, and when the speaker pressurizes, the pressure change in the fluid passage is detected by the microphone.
The clogging state is judged by the detected pressure. That is, the pressure detected by the microphone changes according to the law of gas PV = RT, and if there is a change in volume (V) due to clogging in the fluid passage, it is detected as a change in pressure (P), and the clogging is determined accordingly. Therefore, it can be detected very easily in a non-contact manner, and the detection can be judged relatively accurately. Therefore, the clogging state can be easily determined by determining once a day or once in half a day, and by repeating the cleaning operation, the fluid device can always be operated and controlled with the best performance.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment of the drawings. FIG. 1 shows an embodiment of a filter, 1 is a duct, 2 is a mesh, 3 is a fan, and 4 is a speaker provided in the duct 1. Reference numeral 5 is a microphone for detecting a pressure change, 6 is a microphone provided on the opposite side of the mesh filter 2, 7 is a logic circuit for calculating the ratio of the detection signals of both microphones 5, 6, and this output is displayed on the display device 8. .. Now, the speaker 4 is driven in the duct containing the mesh 2 to apply pressure. The pressure fluctuation in the duct 1 at that time is detected by the microphone 5, and the detection signal of the microphone 5 detects the pressure P which changes according to the law of gas PV = RT. That is, depending on the clogging state of the mesh 2, if there is clogging, the volume V in the duct changes,
The pressure P corresponding to this volume change is detected by the microphone 5, whereby the mesh surface clogging state is detected. Further, the microphone 6 can detect the attenuated pressure passing through the filter 2, and the clogging in the passing direction of the mesh filter 2 can also be detected from this detection signal.
The detection signals of both microphones 5 and 6 are added to the logic circuit 7 to perform the arithmetic processing of the ratio of both signals, and to compare with known data for judgment and output a clogging signal for display. It is displayed on the device 8. This display shows the degree of clogging, instructions for cleaning and replacing the mesh. As a result, the worker can easily perform the work such as cleaning and replacement, or can send the work automatically by sending a signal.

The above-mentioned detection judgment is performed even in continuous operation.
If it is carried out once or twice a day, it will usually be in time and the fluid device can be operated with high performance. Instead of providing a speaker and a microphone for the action of pressure and the detection of pressure, one piezoelectric element can be used in common. This uses, for example, an electrostrictive material, generates a strain pressure when driven by applying a voltage, and can detect a voltage signal when pressure is applied from the outside. The generated pressure is 10 Hz to 10
Accurate determination can be performed by using 0 Hz, repeating transmission and reception, and determining the accumulated value as data.

FIG. 2 shows an embodiment of a radiator, in which 9 is a cooling fin, 10 is a pipe penetrating each fin 9, and a cooling liquid flows through this pipe 10. Although not shown, the pipe 10 through which the cooling liquid flows is provided with a speaker and a microphone, or a piezoelectric element that serves as a single device, and by this, clogging of the pipe 10 is detected and determined periodically.

[0009]

As described above, according to the present invention, a speaker that repeatedly applies pressure to a fluid passage such as a liquid or a gas is provided, and a microphone that detects a pressure change in the fluid passage at the time of pressurization by the speaker is provided. Since the clogging is judged by the detection pressure of the microphone, the clogging judgment can be detected relatively easily and relatively easily, and the clogging condition can be judged easily by the regular detection once a day. As a result, by performing operations such as cleaning and filter replacement, the fluid device can always be operated and controlled with the best performance.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram of another embodiment of the present invention.

[Explanation of symbols]

 1 duct 2 mesh filter 3 fan 4 speaker 5,6 microphone 7 logic circuit 8 display device

Claims (2)

[Claims] 1. In a fluid device such as a filter or a radiator, a speaker that repeatedly applies pressure to a fluid passage is provided, and a microphone that detects a pressure change in the fluid passage at the time of pressurization by the speaker is provided. A fluid device characterized in that clogging is determined by detected pressure. 2. The fluid device according to claim 1, wherein the speaker and the microphone are combined into one piezoelectric element.