CN201490092U

CN201490092U - Electronic pressure switch for digital display microprocessor

Info

Publication number: CN201490092U
Application number: CN2009201725934U
Authority: CN
Inventors: 赵宽
Original assignee: Anhui Tiankang Group Co Ltd
Current assignee: Anhui Tiankang Co., Ltd.
Priority date: 2009-06-15
Filing date: 2009-06-15
Publication date: 2010-05-26
Anticipated expiration: 2019-06-15

Abstract

The utility model discloses an electronic pressure switch for a digital display microprocessor, comprising a box body internally provided with an electric control board; the front of the box body is provided with a control button and a state display digital tube; one side of the box body is provided with a stainless steel air plug through which a signal output line is led out and connected with a supervisor computer, and the other side of the box body is provided with a data pick-up device that is a meal cylinder internally provided with an isolated strain gage or a silicon pressure sensor; the isolated strain gage or silicon pressure sensor is connected with the electric control board through a data line; the outer end of the cylinder is connected with a dielectric input tube through a nut; and the joint part of the nut and the dielectric input tube is surrounded by a plastic O-shaped sealing ring. The utility module integrates real-time output standard 4-20 mA standard power supply function of a transmitter with switching quantity function performed by output setting of regular pressure switch; and a user can observe the dynamic real-time condition of the system from a display window conveniently and observe the static data of the set point.

Description

Digital display type microprocessor electron pressure switch

Technical field:

The utility model design automatic control switch field is a kind of digital display type microprocessor electron pressure switch specifically.

Background technology:

Along with electronic technology and fast development of information technology, pressure measxurement and automatic control technology have been deep into the every field of people's live and work, pressure switch is as the comparatively ripe product of a kind of structure, be widely used in from air pressure, hydraulic pressure is mainly used in system, main frame, subsidiary engine and the liquid level of industries such as petrochemical industry, iron and steel electric power, rubber and plastic engineering, electric wire and plastics light industry, the control of pressure reduction to the control of oil pressure.In recent years, not only be confined to open and close type binary states control as the pressure switch of one of control mode of amount of pressure to a certain point pressure, but on the basis of switch control, want to realize differentiating simultaneously the pressure size, the control point is set continuously, carry out functions such as distant signal transmission, so electron pressure switch replaces various mechanical compression switches to become the main flow of application gradually.

The present situation in pressure switch field is at present:

1) at present the domestic market pressure switch still is that U.S., day, the moral of import produces particularly that the mechanical compression switch of the CCS company of the U.S. dominates, and the user is dependence on import basically at present, so newly go up the needs that the electron pressure switch project is market; Also be the needs of technological progress, substitute the needs of import especially.The design considerations of mechanical type pressure switch is a force balance principle, generally adopts spring mechanism to do the setting of controlled pressure.What employing was gone up in famous U.S. CCS pressure switch design is exactly the dual spring structure.But because the spring structure self characteristics has just stayed technological deficiency congenitally:

1. be that so-called breakpoint and dead band are difficult to overcome, section is set in the control of mechanical type pressure switch, and the setting accuracy at low pressure stage has just had certain restriction especially;

2. set point number is few, and the unit switch generally can only be controlled single-point, and common user also only does the single-point setting and controls;

3. the contact export-restriction the has been arranged raising in speed, reliability and useful life of mechanical type pressure switch of relay-type.

2) the main adopts pressure sensor of electron pressure switch carries out force samples, and what the measuring range of pressure sensor was low can arrive several handkerchiefs, and high can arrive the hundreds of MPa, and measuring range is quite wide.Simultaneously because its application is very wide, so electron pressure switch is also applicable to various occasions, for example high temperature and having in the industry control environment of corrosion.Because the frequency response speed of pressure sensor is all very fast, generally all more than 1kHz, so electron pressure switch can carry out the speed-sensitive switch conversion, and it is tired not have machinery, long service life; Moreover be exactly that to change what produces with pressure in the whole pressure range ability of pressure sensor be an electric weight of linearity continuously, there are not dead band and breakpoint, therefore the size of switch motion point can be set arbitrarily by bleeder circuit easily, the number of switch motion point also can be arranged to a plurality of, be independent of each other between each switching point, can independently carry out control operation, also capable of being combinedly finish control operation.These characteristics is that conventional mechanical formula pressure switch is incomparable.

Pressure sensor directly is converted to non electrical quantity-pressure electric weight-voltage or the electric current that can directly measure, microprocessor amplifies with consolidation sensor signal by signal condition again to be handled, at last by comparing, make this device on the pressure threshold that sets, output level is a certain logic state, this logic level can be input to microcontroller, drives rear portion circuit or control electric switch.The user can decide the force value of the action of pressure switch by setting level conversion thresholding, and the signal of telecommunication after can handling by amplification and consolidation be monitored and long-distance transmissions in real time to pressure.

Summary of the invention:

For solving the problem that prior art exists, the spy provides digital display type microprocessor electron pressure switch, comprise that data are picked up, electrical control, data output three parts, solved on-the-spot (environment is abominable) pressure medium data and picked up the technical problem of handling with remote data concentration.

The technical solution adopted in the utility model:

Digital display type microprocessor electron pressure switch is characterized in that: have a box body, box body inside is equipped with electric control panel, and control button is installed in the box body front and state shows charactron; Box body one side is equipped with the stainless steel aviation plug, and output line is drawn by the stainless steel aviation plug, is connected to host computer; The box body opposite side is equipped with the data pick device, described data pick device is a metallic cylinder, in the tube isolated form foil gauge or silicon pressure sensor are installed, isolated form foil gauge or silicon pressure sensor are connected with electric control panel by electric wire, the tube outer end is connected with the medium input pipe by nut, and described nut and medium input pipe junction are wrapped with the plastic cement O-ring seals.Described plastic cement O-ring seals adopts polytetrafluoroethylmaterial material to make, and includes required single-chip microcomputer on the described electric control panel, A/D conversion and output circuit, and modulate circuits etc., described host computer are electronic computer.

Advantage of the present utility model:

Compared with prior art there is following advantage in the digital display type microprocessor electron pressure switch that the utility model provides:

1. to set the switching value function that forms be one to the output of collection real-time outputting standard 4-20mA standard electric weight function of transmitter and conventional pressure switch, the user can observe dynamic system real time status from display window easily, also can observe the data-at-rest of set point.This invention can make things convenient for the more economical succinct system pressure process control equipment that is provided with of user, has improved the reliability of system's control;

2. but multiple spot is set the controlled pressure point, is used to set controlled pressure by setting button, when not reached set point by measuring pressure, output stage action (output triode conducting), output indicator (green light) is bright, and when meeting or exceeding set point, green light is bright into red colored lamp by the bright change variable color of going out.When pressure descends, reduce to setting pressure following certain return the amount of stagnating after, red light becomes green light by going out.

3. can set back the size of the amount of stagnating according to the system process needs, set button by time amount of stagnating and regulate.

Description of drawings:

Fig. 1 is a structural representation of the present utility model.

Embodiment:

Digital display type microprocessor electron pressure switch: have a box body 1, box body inside is equipped with electric control panel, and control button is installed in box body 1 front and state shows charactron; Box body 1 one sides are equipped with stainless steel aviation plug 2, and output line is drawn by stainless steel aviation plug 2, is connected to host computer; Box body 1 opposite side is equipped with data pick device 3, described data pick device 3 is a metallic cylinder, in the tube isolated form foil gauge or silicon pressure sensor are installed, isolated form foil gauge or silicon pressure sensor are connected with electric control panel by electric wire, the tube outer end is connected with the medium input pipe by nut 4, and described nut 4 is lined with plastic cement O-ring seals 5 with medium input pipe junction.Described plastic cement O-ring seals 5 adopts polytetrafluoroethylmaterial material to make, and includes required single-chip microcomputer on the described electric control panel, A/D conversion and output circuit, and modulate circuits etc., described host computer are electronic computer.

The utility model one-tenth table can be realized following function:

1. can set the bound force value

2. switching value is set (in range) arbitrarily

3. can adapt to the pressure control of water, vapour, wet goods to fluid pressure medium.

4. hickey place pressure input.

5.LED signal lamp prompting on off state, when pressure did not reach set point, green light was bright, red light bright (caution look) when pressure reaches set point, and when pressure was reduced to (or exceeding) set point, red light went out.The green light recandescence.

6. return the amount of stagnating and set, can set two pressure spots by panel button control, the one, operating point, the 2nd, recovery point.

7. upper and lower limit pressure is set and is controlled by panel button.Upper and lower limit pressure is equipped with the LED signal lamp of open and close state.

Multifunctional digital decline processor electron pressure switch the key technical indexes and performance:

1 sets accuracy class 0.25～0.50%

2 set repeatability precision≤± 0.35% (max)

3 ranges, 0～40Mpa

4 outputs, 4～20mA, voltage 18～24 (DC) (analog quantity)

5 output 15～36 (DC) upper and lower limit double switch amounts.

6 operating currents/DC

7 response times≤2mS

8 switching frequencies 〉=1000/S

9 power consumptions≤40mA

10 temperature are floated (error under the temperature)≤± 0.5%40 ℃.max

11 load capacity:

1) photoelectrical coupler 20mA/30V DC

2) transistor relay 80mA/220AC (CMOS type)

3) electromagnetic relay 3A/220AC

12 working temperatures :-20 ℃～80 ℃.

13 degree of protection: IP65

14 protection modes: rubber gasket (circle) compresses sealing

15 case materials: 1C r 18N i 9T i

The indication of 16 light-emitting diode states, the miniature potentiometer parameter setting of multi-turn

Claims

1. digital display type microprocessor electron pressure switch has a box body, and box body inside is equipped with electric control panel, and control button is installed in the box body front and state shows charactron; Box body one side is equipped with the stainless steel aviation plug, and output line is drawn by the stainless steel aviation plug, is connected to host computer; It is characterized in that: the box body opposite side is equipped with the data pick device, described data pick device is a metallic cylinder, in the tube isolated form foil gauge or silicon pressure sensor are installed, isolated form foil gauge or silicon pressure sensor are connected with electric control panel by transmission line, the tube outer end is connected with the medium input pipe by nut, and described nut and medium input pipe junction are lined with the plastic cement O-ring seals.

2. digital display type microprocessor electron pressure switch according to claim 1, it is characterized in that: described plastic cement O-ring seals adopts polytetrafluoroethylmaterial material to make, include required single-chip microcomputer on the described electric control panel, A/D conversion and output circuit, modulate circuits etc., described host computer are electronic computer.