CN2458610Y

CN2458610Y - Portable medical intelligent vacuum-meter check meter

Info

Publication number: CN2458610Y
Application number: CN 01217142
Authority: CN
Inventors: 张玉明; 薛冠群
Original assignee: DRUG AND INSTRUMENT TESTING INSTITUTE OF LOGISTICS DEPARTMENT NANJING MILITARY REGION PLA
Current assignee: DRUG AND INSTRUMENT TESTING INSTITUTE OF LOGISTICS DEPARTMENT NANJING MILITARY REGION PLA
Priority date: 2001-01-15
Filing date: 2001-01-15
Publication date: 2001-11-07
Anticipated expiration: 2011-01-15

Abstract

The utility model relates to a pressure instrument testing or calibration device for measuring the vacuum in physics, which is composed of a mini-type gas storage tank, a vacuum pump, a back-up valve, a pressure sensor and a control circuit, wherein, the inlet of the mini-type gas storage tank is communicated and connected with a quick joint which is connected with the vacuum pump simultaneously, and is communicated and connected with the back-up valve. The power end of the vacuum pump is connected with an alternating current power supply through a relay which is controlled by a console switch on a panel; the power end of the back-up valve is connected with a DC low voltage power supply through a voltage boosting switch; the outlet of the mini-type gas storage tank is connected with the pressure sensor. The control circuit is composed of a high-precision amplifier, an SCM and a display. The output end of the pressure sensor is connected with the input end of the high-precision amplifier of which the output end is connected with the SCM of which the output end is connected with the display.

Description

Portable intelligent calibrator for medical vacuum gauge

The utility model relates to a kind of numeric type portable intelligent vacuum meter tester, belongs to the manometer test or the calibrating installation of measurement of vacuum in the physics.

At present, most vacuum meter calibration detection apparatus all adopt pointer high precision standard scale, be equipped with special use and make pressure equipment (vacuum pump) and control desk, the part tester also is made of one malleation verification and negative pressure verification, thereby it is bulky, manipulate inconvenience, fragile, the unit far away, that the guard station disperses that is unfavorable for especially adjusting the distance implements situ metrology and detects.

The utility model aims to provide a kind of portable intelligent calibrator for medical vacuum gauge, to overcome the deficiency of traditional vacuum table tester, the drawback fragile with thorough elimination pointer instrument, that inconvenience is carried.And make it intelligent, miniaturization, to implement Measuring and testing, reach safety, reliable, convenient, effective purpose to the vacuum medical equipment of health service unit from far-off regions.

Technical solution of the present utility model:

A kind of portable intelligent calibrator for medical vacuum gauge, it is characterized in that it is by miniature gas-holder, vacuum pump, back-up valve, pressure transducer and control circuit are formed, the rapid-acting coupling that is used to detect tested vacuum meter is connected with miniature gas-holder import, link to each other with vacuum pump by retaining valve simultaneously, and be connected with back-up valve simultaneously, the power end of vacuum pump connects AC power by relay, this relay is controlled by the operating switch on the panel, the power end of back-up valve connects Dc low voltage power supply by boosted switch, the outlet of miniature gas-holder connects pressure transducer, control circuit is by high-precision amplifying, single-chip microcomputer and display constitute, the output of pressure transducer just links to each other with the high-precision amplifying input, high-precision amplifying output connects single-chip microcomputer, and single-chip microcomputer output connects display.

The utlity model has following advantage:

1, design is particular about rationally.With intellectuality, miniaturization, digital be basic mentality of designing, to guarantee the small and exquisite practicality of complete machine, be convenient to that different regions are on-the-spot detects, thoroughly eliminate the drawback that pointer instrument is fragile, inconvenience is carried.Reach safe, reliable, convenient, effective purpose.

2, require applicable object wide.Design one group of rapid-acting coupling, revise to guarantee that through processing repeatedly its impermeability is good, and can connect various types of vacuum meters and carry out calibrating and measuring,, adapt to the actual needs of different occasion gage works to improve the coverage rate of vacuum meter calibrating.

3, accuracy requirement height.Adopt instrument high precision negative pressure transducer and measuring amplifier, accuracy reaches 0.2 class precision, satisfies the Measuring and testing requirement of hospital's measuring room and other relevant units.

4, automaticity height.Whole assay calibration process is once finished by vertification regulation, makes things convenient for the user.

5, dredge null process and adopt miniature buffering gas-holder and minipump, accomplish small-sizedly, light, can implement Measuring and testing easily the vacuum medical equipment of hospital from far-off regions and other unit.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is a structure connection diagram of the present utility model;

Fig. 2 is the electrical schematic diagram of high-precision amplifying in the utility model control circuit.

As Fig. 1, the utility model is by miniature gas-holder 1, vacuum pump 2, back-up valve 3, pressure transducer 4 and control circuit 5 are formed, the rapid-acting coupling 7 that is used to detect tested vacuum meter 14 is connected with miniature gas-holder 1 import, link to each other with vacuum pump 2 by retaining valve 8 simultaneously, and be connected with back-up valve 3 simultaneously, the power end of vacuum pump 2 connects AC power by relay 9, this relay 9 is controlled by the operating switch on the panel, the power end of back-up valve 3 connects Dc low voltage power supply by boosted switch 10, the outlet of miniature gas-holder 1 connects pressure transducer 4, control circuit 5 is by high-precision amplifying 11, single-chip microcomputer 12 and display 13 constitute, the output of pressure transducer 4 just links to each other with high-precision amplifying 11 inputs, high-precision amplifying 11 outputs connect single-chip microcomputer 12, and single-chip microcomputer 12 outputs connect display 13.

The physical circuit of the utility model high-precision amplifying 11 such as Fig. 2, it is made up of positive and negative following-up type mu balanced circuit and operational amplification circuit, wherein positive and negative following-up type mu balanced circuit is by transistor T, amplifier IC2, voltage stabilizer IC1 and resistance R 1, R2, capacitor C 1-C4 constitutes, the input/output terminal of voltage stabilizer IC1 respectively and connect capacitor C 1, C2, the input of IC1 connects the dc low-voltage positive supply, its output connects the inverting input of IC2 by R1, the in-phase input end ground connection of IC2, the R1 other end links to each other with the emitter-base bandgap grading of transistor T by R2, the base stage of T connects the output terminal of IC2, the collector of T connects the dc low-voltage negative supply of symmetry, operational amplification circuit is by amplifier IC3, resistance R 3-R9, potentiometer VR1, VR2, capacitor C 6, C7 constitutes, the output of voltage stabilizer IC1 in the positive and negative following-up type mu balanced circuit of the positive supply termination of IC3, the emitter-base bandgap grading of its negative supply termination transistor T, the inverting input of IC3 links to each other with an end of pressure transducer 4 by R3, the in-phase output end of I3 is by the R4 and the VR1 other end that connects pressure transducer 4 of serial connection, pressure transducer 4 can be a negative pressure transducer (model can be NS-K), the inverting input of IC3 is the resistance R 5 by being connected in series simultaneously, R6 connects the output terminal of IC3, the in-phase input end of IC3 is by the resistance R 8 of serial connection, R9 ground connection, R5, the tie point of R6 meets R8 by the resistance R 7 and the potentiometer VR2 of serial connection, the tie point of R9.

Portable intelligent vacuum meter tester of the present utility model is made up of efficient mini vacuum pump, retaining valve, four-way valve, rapid-acting coupling, tested table, back-up valve, miniature gas-holder, pressure transducer, high-precision amplifying, A/D converter and 8051 single-chip computer control systems, light-emitting diode display and printer.Minipump 2 connects alternating current 220V by relay 9 controls, dredges sky and make pressure when the verification duty.The bleeding point of vacuum pump 2 connects retaining valve 8, retaining valve 8 is logical during vacuum pump 2 work, end when not working, the other end of retaining valve 8 is received four-way valve 6, three mouthful of one termination rapid-acting coupling 7 in addition of four-way valve 6 connects tested vacuum meter 14, another mouth connects back-up valve 3, back-up valve 3 is by 10 controls of the boosted switch on the instrument panel, + 12v power supply, the negative pressure gas circuit was communicated with ambient atmosphere and boosts when back-up valve 3 was opened, four-way valve 6 also has a port to receive miniature gas-holder 1, and the effect of gas-holder 1 is to guarantee that gas circuit reaches buffer action when finding time and boost, and force value is unlikely undergos mutation.By gas-holder 1 gas circuit is connected to negative pressure transducer 4 cavitys, it is by+5V power supply.

Ultimate principle of the present utility model is: the reference cavity by negative pressure transducer 4 converts pressure signal to voltage signal, send A/D conversion and 8051 Single Chip Microcomputer (SCM) system to handle after the high-accuracy voltage amplifier amplifies, and measurement result is printed by LED demonstration, mini-printer.

Sensor 4 of the present utility model is designed to+the 5V power supply, 0-100mV output, and the reference cavity of its internal stability can satisfy the requirement of calibration measurement precision.High-precision amplifying 11 mainly is made up of amplifier IC3 and outer meeting resistance, electric capacity etc., outside ± 12V power supply through positive and negative following-up type mu balanced circuit give amplifier IC3 provide symmetry highly ± the 5V power supply.It follows the tracks of the voltage stabilizing process: when certain reason raise voltage stabilizer IC1 output+5V, the 2 pin current potentials of amplifier IC2 also raise, and the 6 pin current potentials of IC2 reduce, and transistor T conducting electric current strengthens, and then the output negative pressure of the emitter of T is higher, and vice versa.The highly power supply of symmetry is provided so just for amplifier IC3, guarantees its working stability.

The input end (Vin) of amplifier IC3 is received in the output of sensor 4, potentiometer VR1 and VR2 are respectively applied for zero-bit and full scale adjustment, all resistance adopts precision resistance, assurance makes by the temperature drift of big device minimum, back level A/D conversion is delivered in the output of amplifier IC3 (Vout) and 8051 Single Chip Microcomputer (SCM) system are handled, and entire work process is by the software support.

Claims

1, a kind of portable intelligent calibrator for medical vacuum gauge, it is characterized in that it is by miniature gas-holder, vacuum pump, back-up valve, pressure transducer and control circuit are formed, the rapid-acting coupling that is used to detect tested vacuum meter is connected with miniature gas-holder import, link to each other with vacuum pump by retaining valve simultaneously, and be connected with back-up valve simultaneously, the power end of vacuum pump connects AC power by relay, this relay is controlled by the operating switch on the panel, the power end of back-up valve connects Dc low voltage power supply by boosted switch, the outlet of miniature gas-holder connects pressure transducer, control circuit is by high-precision amplifying, single-chip microcomputer and display constitute, the output of pressure transducer just links to each other with the high-precision amplifying input, high-precision amplifying output connects single-chip microcomputer, and single-chip microcomputer output connects display.

2, by the described portable intelligent calibrator for medical vacuum gauge of claim 1, it is characterized in that described high-precision amplifying is made up of positive and negative following-up type mu balanced circuit and operational amplification circuit, wherein positive and negative following-up type mu balanced circuit is by transistor T, amplifier IC2, voltage stabilizer IC1 and resistance R 1, R2, capacitor C 1-C4 constitutes, the input/output terminal of voltage stabilizer IC1 respectively and connect capacitor C 1, C2, the input of IC1 connects the dc low-voltage positive supply, its output connects the inverting input of IC2 by R1, the in-phase input end ground connection of IC2, the R1 other end links to each other with the emitter-base bandgap grading of transistor T by R2, the base stage of T connects the output terminal of IC2, the collector of T connects the dc low-voltage negative supply of symmetry, operational amplification circuit is by amplifier IC3, resistance R 3-R9, potentiometer VR1, VR2, capacitor C 6, C7 constitutes, the output of voltage stabilizer IC1 in the positive and negative following-up type mu balanced circuit of the positive supply termination of IC3, the emitter-base bandgap grading of its negative supply termination transistor T, the inverting input of IC3 links to each other with an end of pressure transducer 4 by R3, the in-phase output end of I3 is by the R4 and the VR1 other end that connects pressure transducer 4 of serial connection, pressure transducer 4 is a negative pressure transducer, the inverting input of IC3 is the resistance R 5 by being connected in series simultaneously, R6 connects the output terminal of IC3, the in-phase input end of IC3 is by the resistance R 8 of serial connection, R9 ground connection, R5, the tie point of R6 meets R8 by the resistance R 7 and the potentiometer VR2 of serial connection, the tie point of R9.