CN1736540A

CN1736540A - Apparatus for monitoring blockage status of mechanical filter

Info

Publication number: CN1736540A
Application number: CN 200410024563
Authority: CN
Inventors: 王惠生
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-08-17
Filing date: 2004-08-17
Publication date: 2006-02-22

Abstract

The invention provides a monitor for the stoppage of mechanical filter, belonging to a monitoring device, which comprises a pressure sensor in liquid inlet pipe, another sensor in liquid inlet cavity of mechanical filter, and a third pressure sensor in liquid outlet cavity, every pressure sensor being equipped with the carry-in terminal of micro processor, the outlet of which is separately equipped with a display and a alarm, and the display being used to monitor the stoppage state of mechanical filter continuously and precisely. With the monitor people can control the mechanical filter actively according to the stoppage state.

Description

Mechanical filter stopping state monitor

Technical field

The invention provides a kind of monitoring device of mechanical filter working condition, especially the monitoring device of mechanical filter stopping state.

Background technology

In industrial production and daily life, often use mechanical filter to filter.In the use of filter, all there is the periodic duty cycle of one " the normal use---stop up gradually---stop up---block clearing (recoil)---normal use ".Because mechanical filter generally has a metal shell, people are difficult to observe its inner situation, therefore people never find a kind of stopping state to mechanical filter monitoring method and device thereof timely, that accurately judge, can only carry out passive management and control by rule of thumb.

Summary of the invention

Technical problem to be solved by this invention is, a kind of mechanical filter stopping state monitor is provided so that people to the stopping state of mechanical filter carry out in time, monitoring accurately.

The present invention realizes like this, mechanical filter stopping state monitor, it has the pressure sensor that is positioned at the preceding feed tube of liquid flowing valve, be positioned at another sensor of the admission chamber of mechanical filter in addition, and the 3rd pressure sensor that goes out sap cavity that is positioned at mechanical filter, each pressure sensor links to each other with the input of microprocessor respectively, and the output of microprocessor is connected to display and alarm respectively.

This mechanical filter stopping state monitor, can be continuously, exactly the stopping state of mechanical filter is monitored, be convenient to people in time, judge exactly to the stopping state of mechanical filter, people can manage and control mechanical filter on one's own initiative according to stopping state, make industrial production and daily life be able to safe, orderly carrying out.

Description of drawings

Fig. 1 is the schematic diagram of structure of the present invention.

Among the figure, the 1-pressure sensor, the 2-feed tube, the 3-liquid flowing valve, another pressure sensor of 4-, the 5-admission chamber, the 6-mechanical filter, 7-goes out sap cavity, 8-the 3rd pressure sensor, 9-microprocessor, 10-display, 11-alarm.

The specific embodiment

Further specify structure of the present invention and operation principle below in conjunction with accompanying drawing.

As shown in drawings, the present invention's mechanical filter stopping state monitor, it has the pressure sensor (1) that is positioned at the preceding feed tube (2) of inlet valve (3), be positioned at another sensor (4) of the admission chamber (5) of mechanical filter (6) in addition, and the 3rd pressure sensor (8) that goes out sap cavity (7) that is positioned at mechanical filter, each pressure sensor links to each other with the input of microprocessor (9) respectively, and the output of microprocessor is connected to display (10) and alarm (11) respectively.

The monitoring principle of this monitor is: a, close at liquid flowing valve, under the idle state of mechanical filter, record the maximum power force value in the mechanical filter feed tube, and record mechanical filter and go out static pressure value in the sap cavity, last value deducts back one value, gets the complete occlusion resistance value of mechanical filter; B opens at liquid flowing valve, under the state of mechanical filter work, records the force value in the mechanical filter admission chamber, and records mechanical filter and go out force value in the sap cavity, and last value deducts back one value, the actual resistance value during mechanical filter work; C, the actual resistance value gets the chocking-up degree value divided by complete occlusion resistance value; D compares chocking-up degree value and an a reference value, determines stopping state.

The course of work of any mechanical filter, can be divided into simply filter before, filter in (liquid passes through filter medium), filter back three parts.In the course of work, the pressure before filtering, after the filtration changes has mutual corresponding relation with its chocking-up degree.

Close at liquid flowing valve, under the idle state of mechanical filter, the pressure in the feed tube is the maximum pressure that the system dynamic transmission comes.Pressure under this state and the state that mechanical filter stops up fully in the feed tube is identical.At this moment, bear liquid transmitting power system (being generally pipe-line system) in the feed tube and transmit the maximum power pressure of coming, this force value that records is the maximum power force value, and this force value can be designated as P _{Dynamic pressure}Only bear the pressure (being static pressure) that the liquid level because of the hydrodynamic induction system brings in the sap cavity and go out, this force value that records is the static pressure value, and this force value can be designated as P _{Static pressure}Preceding value deducts the back value, and the complete occlusion resistance value that obtains can be designated as P _Stifled=P _{Dynamic pressure}-P _{Static pressure}

Under the state of liquid flowing valve unlatching, mechanical filter work, the force value of the admission chamber that records, promptly the force value before the filter medium can be designated as P _AdvanceThe force value that goes out sap cavity that records, promptly the force value behind the filter medium can be designated as P _{Go out}Preceding value deducts the back value, and the actual resistance value that obtains can be designated as P _Real=P _Advance-P _{Go out}P _Advance, P _{Go out}Change along with the variation of chocking-up degree, stop up serious more P _AdvanceBig more, P _{Go out}More little; Otherwise, P _AdvanceMore little, P _{Go out}Big more.

For a definite filtration system, P _{Dynamic pressure}And P _{Static pressure}All be definite value, we can record this two values at an easy rate.Although with P _AdvanceAnd P _{Go out}The variation of the pressure differential chocking-up degree that also can come monitoring machine tool filter, but this monitoring mode is very not directly perceived, and different filtration system P _Advance-P _{Go out}Value difference not very big.For monitoring the chocking-up degree of mechanical filter conveniently, intuitively, all sidedly, we use (actual resistance value)/(occlusion resistance value fully), i.e. (P _Advance-P _{Go out})/(P _{Dynamic pressure}-P _{Static pressure}) the chocking-up degree value that obtains monitors.This value is between 0～1, is 0 when not stopping up fully, is 1 when stopping up fully.For meeting people's daily habits, also can use (P _Advance-P _{Go out})/(P _{Dynamic pressure}-P _{Static pressure}) * 100% is explained.This value is between 0～100%.Generally, people generally do not take block clearing or other technical measures after mechanical filter stops up fully, because caused ordinary production and life and had a strong impact on this moment, but to a certain degree reach at 70% o'clock as the chocking-up degree value and assert that promptly this filter stops up stopping up, need take block clearing or other technical measures.This chocking-up degree value promptly 70% is an a reference value.The chocking-up degree value that records is compared with this a reference value, can monitor the stopping state of mechanical filter in time, exactly.

The present invention's monitor earlier with the inlet valve closing, records P respectively by pressure sensor (1), the 3rd pressure sensor (8) in use _{Dynamic pressure}And P _{Static pressure}, and these two pressure signals are sent into microprocessor.With the inlet valve opening, under the state of mechanical filter work, record P respectively continuously then by another sensor (4) and the 3rd sensor (8) _AdvanceAnd P _{Go out}, and with P _AdvanceAnd P _{Go out}Signal send into microprocessor continuously.It is P that microprocessor is finished the occlusion resistance value respectively _{Dynamic pressure}-P _{Static pressure}, the actual resistance value is P _Advance-P _{Go out}Calculating, the calculating of chocking-up degree value, and the comparison of a chocking-up degree value and an a reference value.And the chocking-up degree value signal is delivered to display show.When the chocking-up degree value surpasses a reference value, this signal is delivered to alarm, send alarm signal by alarm, inform that the operator takes block clearing or other technical measures.

Each pressure sensor can be connected on the data collecting card, and data collecting card is connected on the data conversion card again, and data conversion card links to each other with microprocessor again.The pressure signal that each pressure sensor is recorded by data collecting card, data conversion card converts the data signal that microprocessor can be discerned to.The design of the design of each operation program in the microprocessor and demonstration, warning circuit is conspicuous to those skilled in the art, does not need to pay performing creative labour, therefore, no longer describes in detail.

Claims

1, mechanical filter stopping state monitor, it is characterized in that, it has the pressure sensor (1) that is positioned at the preceding feed tube (2) of liquid flowing valve (3), be positioned at another sensor (4) of the admission chamber (5) of mechanical filter (6) in addition, and the 3rd pressure sensor (8) that goes out sap cavity (7) that is positioned at mechanical filter, each pressure sensor links to each other with the input of microprocessor (9) respectively, and the output of microprocessor is connected to display (10) and alarm (11) respectively.