CN2410540Y

CN2410540Y - Automatic timing cleaning device for meter measuring element

Info

Publication number: CN2410540Y
Application number: CN 00229381
Authority: CN
Inventors: 陈石林
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-03-09
Filing date: 2000-03-09
Publication date: 2000-12-13
Anticipated expiration: 2010-03-09

Abstract

The utility model relates to a blowing device for a measuring element, which can be used for measuring parameter, such as wind speed, etc., in a gas pipeline, particularly a gas pipeline with dust. The utility model comprises a measuring pipeline which is connected with a measuring element, and a meter pipeline which is connected with a transducer. The utility model is characterized in that two position valves are connected in series between the measuring pipeline and the meter pipeline. Both ends of frequent openings of the two position values are connected with the measuring pipeline and the meter pipeline. One end of frequent break openings of the two position values is respectively connected with a pressure air source by a solenoid valve of 1DZF, and the other end of the frequent break openings is respectively communicated with the measuring pipeline. The utility model has the advantages of simple structure, reliable work and convenient operation, and can effectively prevent the blocking of dust to the measuring element.

Description

Instrument measurement element self-timing blow device

The utility model relates to and a kind ofly is used for gas pipeline, especially contains the device that the isoparametric measuring cell of measuring wind purges in the gas pipeline of dust, thereby it can avoid the obstruction of measuring cell to guarantee the work of its normal reliable.

Measuring wind, the pressure and other parameters technological process of control system better in gas pipeline makes it the operation of economic security ground.The detection of parameter is undertaken by being installed in ducted measuring cell.Because it is less that measuring cell is measured the bore of mouth, wherein the malleation mouth must be in face of the air-flow setting, dust in the gas is easier to enter the measurement mouth like this, on the other hand, because the electrostatic effect that friction produced between measuring cell and gas and dust also can make dust after measuring a mouthful productive set, so using a period of time, measuring mouthful will blockage phenomenon, makes the detection of measuring cell malfunctioning.Above-mentioned situation is especially serious in containing the gas pipeline of more dust, and the cycle of obstruction is also shorter.At present, normally adopt manual type that obstruction is removed, this brings suitable inconvenience to use.

The purpose of this utility model is to provide a kind of instrument measurement element self-timing blow device at the problem of above-mentioned existence, and it can effectively prevent the generation of measuring cell stopping state.

The technical scheme that realizes the utility model purpose is as follows: include signal piping 5 that joins with measuring cell 4 and the instrumentation pipeline 2 that joins with transmitter 3, its difference is to be serially connected with two-position valve between signal piping and instrumentation pipeline, the normal open mouth two ends of two-position valve join with signal piping and instrumentation pipeline, normal off mouth one end of two-position valve joins through a magnetic valve 1DZF and a pressure gas source 1, and the other end is connected with signal piping.

Two-position valve can be two-bit triplet Pneumatic valve or two five-way Pneumatic valves in the such scheme, its gas control end joins through magnetic valve 2DZF and pressure gas source, the electric part of magnetic valve 1DZF and 2DZF and automatic time switch circuits for triggering join, so that their turn-on and turn-off regularly.

The course of work of the present utility model is: when automatic time switch circuits for triggering and power connection, its timing circuit is started working, magnetic valve 1DZF and 2DZF still were in and turn-offed the position this moment, two-position valve also is positioned at constant make-position, signal piping is connected with instrumentation pipeline, measure a mouthful air pressure signal that obtains from measuring cell and deliver to transmitter from signal piping and instrumentation pipeline, and air pressure signal is become other signal send out, at this moment be in normal operating conditions for measuring cell and transmitter, when the timing circuit timing puts in place, the switch triggering circuit turn-on is also delayed time a period of time, this moment, magnetic valve 1DZF and 2DZF were switched on simultaneously, pressure gas source is through the gas control end conducting of magnetic valve 2DZF and two-position valve, make its normal off position conducting, constant make-position disconnects, pressure gas source is connected through two-position valve and signal piping, device enters the purging state, air blowing by pressure gas source, can finish the purging task of measuring cell being measured mouth, productive set is disposed rapidly at a dust of measuring the mouth place, to avoid the obstruction of measuring cell, on-off circuit turn-offs after time-delay a period of time again, magnetic valve promptly is closed like this, and two-position valve is return again, and each pipeline is got back to former working position again, measuring cell and transmitter are communicated with, get back to normal operating conditions, aforesaid way can go round and begin again, and can prevent the obstruction of measuring cell effectively.

Good effect of the present utility model is: 1, adopt pressure gas source to purge measuring cell, can effectively remove the productive set dust, avoid the obstruction of measuring cell, the work of detecting element is guaranteed reliably, help the control of technological process and the operation of systematic economy safety; 2, self-timing purges, and need not manually-operated, uses very convenient; 3, whole apparatus structure is simple, reliable working performance.

Fig. 1 is the pneumatic circuit structure chart of an embodiment of the utility model.

Fig. 2 is the circuit diagram of the automatic time switch circuits for triggering of an embodiment of the utility model.

Further specify embodiment of the present utility model below in conjunction with accompanying drawing, this measuring cell 4 is the detecting element of air velocity in the measuring channel, this detecting element has malleation mouth and two air inlets of negative pressure mouth, signal piping 5 with two-way correspondence joins with it, the two-way signal piping respectively with two two five-way Pneumatic valve 1QKF, 2QKF normal open mouth joins, for improving the device reliability of operation, two two five-way Pneumatic valve 3QKF can be set again, 4QKF, wherein the normal open mouth of 1QKF joins through normal open mouth and one road instrumentation pipeline 2 of 3QKF, the normal open mouth of 2QKF links to each other with another road instrumentation pipeline through the normal open mouth of 4QKF, and the terminal of two-way instrumentation pipeline 2 is connected with transmitter 3.In addition, pressure gas source 1 is divided into two-way behind hand-operated valve 1QF, one the tunnel through magnetic valve 1DZF, 1DZF is a two-position three-way valve, join with the normal off mouth of two five-way Pneumatic valve 1QKF, 2QKF, another road is connected with the gas control end of four Pneumatic valve 1QKF, 2QKF, 3QKF, 4QKF through magnetic valve 2DZF, and 2DZF is a two-position three-way valve, outgas mouth place at 2DZF is installed on an adjustable throttling 2QF, in order to regulate the speed that Pneumatic valve resets; Present embodiment automatic time switch circuits for triggering as shown in Figure 2, this circuit is used for controlling the turn-on and turn-off of two magnetic valve 1DZF and 2DZF, this circuit is by change-over switch KK, time relay 1SJ, 2SJ and magnetic valve 1DZF, the automatically controlled end of 2DZF joins and forms, wherein join with the normally-closed contact of 2SJ behind 1.-2. contact of the change-over switch serial connection 1SJ, 1DZF is connected in series with the normally opened contact of 1SJ and the normally-closed contact of 2SJ respectively at two ends mutually with 2DZF and after connecing, 2SJ joins through normally opened contact and the power supply of 1SJ, in addition, at the normally opened contact two ends of 1SJ and be connected to the change-over switch contact 3.-4. with external purging instruction contact ZJ, at the normally-closed contact two ends of 2SJ and connect the change-over switch contact 7.-8., 3.-4. the contact of change-over switch and 7.-8. contact conducting simultaneously or disconnection when switching, change-over switch has disconnection, self-timing, three gears of on-the-spot purging, entire circuit is joined through power switch DK and power supply, in addition, also a lighting circuit can be set, constitute, link with power supply by button AN and lamp D.

The course of work of present embodiment circuit part is: the DK that closes makes circuit enter duty, change-over switch is cut to the self-timing position, 1.-2. contact is connected, the 1SJ conducting picks up counting, the 1SJ normally opened contact closes platform when timing reaches setting value, make 1DZF and 2DZF conducting work, 2SJ also begins the conducting timing simultaneously, and when timing reached setting value, the 2SJ normally-closed contact disconnected, make 1SJ and 1DZF, the equal dead electricity of 2DZF, the normally opened contact of 1SJ is also got back to normally open, makes the 2SJ dead electricity, and the 2SJ normally-closed contact is the return closure again, 1SJ restarts timing, enters purge cycles for the second time; When change-over switch is cut when purging shelves to the scene, contact 3.-4., 7.-8. connect simultaneously makes 1DZF and 2DZF conducting simultaneously, can begin to purge, and cuts when disconnecting shelves when change-over switch, and self-timing and on-the-spot the purging all stop.The conducting of external purging instruction contact ZJ is no matter change-over switch in what position, all can purge.

Claims

1, a kind of instrument measurement element self-timing blow device, include signal piping (5) that joins with measuring cell (4) and the instrumentation pipeline (2) that joins with transmitter (3), it is characterized in that between signal piping and instrumentation pipeline, being serially connected with two-position valve, the normal open mouth two ends of two-position valve join with signal piping and instrumentation pipeline, normal off mouth one end of two-position valve joins through a magnetic valve 1DZF and a pressure gas source (1), and the other end is connected with signal piping.

2, by the described instrument measurement element of claim 1 self-timing blow device, it is characterized in that described two-position valve can be two-bit triplet Pneumatic valve or two five-way Pneumatic valves, its gas control end joins through magnetic valve 2DZF and pressure gas source, and the electric part of magnetic valve 1DZF and 2DZF and automatic time switch circuits for triggering join.

3, by the described instrument measurement element of claim 2 self-timing blow device, it is characterized in that having the two-way signal piping and join with two five-way Pneumatic valve 1QKF, 2QKF normal open mouth respectively.

4, by the described instrument measurement element of claim 3 self-timing blow device, it is characterized in that being provided with again two two five-way Pneumatic valve 3QKF, 4QKF, wherein the normal open mouth of 1QKF joins through normal open mouth and one road instrumentation pipeline of 3QKF, and the normal open mouth of 2QKF links to each other with another road instrumentation pipeline through the normal open mouth of 4QKF.

5, by the described instrument measurement element of claim 4 self-timing blow device, it is characterized in that pressure gas source is divided into two-way behind hand-operated valve 1QF, one tunnel normal off mouth through magnetic valve 1DZF and two five-way Pneumatic valve 1QKF, 2QKF joins, another road is connected with the gas control end of four Pneumatic valves through magnetic valve 2DZF, and 1DZF and 2DZF are two-position three-way valve.

6, by the described instrument measurement element of claim 5 self-timing blow device, it is characterized in that being installed on an adjustable throttling 2QF at the outgas mouth place of magnetic valve 2DZF.