Unlock instant, AI-driven research and patent intelligence for your innovation.

Current pulse type intrinsically safe explosion-proof preamplifier

A preamplifier and current pulse technology, which is applied in pulse shaping, volume/mass flow generated by detecting the dynamic effect of fluid flow and mechanical effect, etc. It can solve the problems of high requirements for detection instruments, inconvenient disassembly and installation, and high installation requirements. problems, to achieve the effect of convenient installation and disassembly, compact structure and high measurement accuracy

Inactive Publication Date: 2016-01-27
中国人民解放军第二炮兵装备研究院第三研究所
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When used in an explosion-proof environment, the voltage output type and pulse output type preamplifier must adopt an explosion-proof method, which has the disadvantages of large volume, high installation requirements, and inconvenient disassembly and assembly; although the current output type preamplifier can use the essential Safety explosion-proof method, but the output signal is analog, which requires high detection instruments, and certain errors will occur during signal processing
At present, there is no preamplifier that can not only use current pulse output, but also realize intrinsically safe explosion-proof in this field.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Current pulse type intrinsically safe explosion-proof preamplifier
  • Current pulse type intrinsically safe explosion-proof preamplifier
  • Current pulse type intrinsically safe explosion-proof preamplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: see attached figure 1 , a current pulse type intrinsically safe explosion-proof preamplifier, which includes: a signal acquisition circuit 1, a shaping circuit 2, a V / I conversion circuit 3 and a power supply circuit 4;

[0014] The signal acquisition circuit 1 includes: an induction coil L with a magnetic steel, a first diode composed of a first diode to a sixth diode D1-D6 connected in forward and reverse parallel at both ends of the induction coil L safety protection circuit, and the first operational amplifier U1A; the induction coil L completes the collection of the flow signal, and outputs a millivolt level voltage signal; the positive input terminal of the first operational amplifier U1A is grounded through the fourth capacitor C4 on the one hand, On the one hand, it is grounded through the eighth resistor R8, on the other hand, it is connected to one end of the induction coil L through the ninth resistor R9, and the negative input terminal of the f...

Embodiment 2

[0018] Embodiment 2: see attached figure 2 , the current pulse type intrinsically safe explosion-proof preamplifier as described in embodiment 1 is characterized in that: it is installed in the shell 5 that is provided with top cover 10 and the outside of lower end is provided with screw thread, and described induction coil L and magnetic conduction The armature 6 is installed inside the lower end of the housing 5, the inside of the housing 5 is filled with silicon rubber 7, and an electrical connector 8 is provided on the side of the upper end; the housing 5 is connected to the turbine flowmeter through the thread, and is Lock nut 9 is fixed.

Embodiment 3

[0019] Embodiment 3: see attached image 3 , the current pulse type intrinsically safe explosion-proof preamplifier as described in Embodiment 2 is installed on the turbine flowmeter in the dangerous area through threads, and the detection circuit in the safe area is isolated by a zener type safety barrier and given by a 2-wire measuring cable. The preamplifier provides operating power. When the fluid flows through the turbine flowmeter, the preamplifier generates a current pulse signal proportional to the flow, and the pulse current signal varies between 4 and 20mA. After the current pulse is isolated by the Zener type safety barrier, a voltage pulse signal is generated on the load resistance, which is counted and processed by the detection circuit to realize the explosion-proof isolation of the electrical signal.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to an electronic circuit, and relates to a pre-amplifier, in particular to a current pulse type intrinsic safety anti-explosion pre-amplifier. According to the technical scheme, the current pulse type intrinsic safety anti-explosion pre-amplifier comprises a signal acquisition circuit (1), a shaping circuit (2), a V / I switching circuit (3) and a power supply circuit (4). The signal acquisition circuit (1) completes collecting of flow signals, outputs millivolt voltage signals, amplifies the signals to the volt level, and carries out smoothing and noise reduction. The shaping circuit (2) shapes the received signals to be voltage square signals which are output to the V / I switching circuit (3). The V / I switching circuit (3) converts the voltage square signals into current pulse signals. The current pulse type intrinsic safety anti-explosion pre-amplifier is simple in circuit, compact in structure, high in measurement accuracy, high in reliability, convenient to mount and dismount, capable of transmitting the flow signals in a long-distance mode, and particularly suitable for the places where intrinsic safety anti-explosion is needed.

Description

technical field [0001] The invention belongs to an electronic circuit, in particular to a preamplifier. Background technique [0002] The flow output signal of the turbine flowmeter is an alternating magnetic signal, which is output to the measuring equipment after magnetoelectric conversion and pre-amplification. The circuit for magneto-electric conversion and pre-amplification is collectively called a preamplifier. There are three types of preamplifier output: current output type, voltage output type and pulse output type. When used in an explosion-proof environment, the voltage output type and pulse output type preamplifier must adopt an explosion-proof method, which has the disadvantages of large volume, high installation requirements, and inconvenient disassembly and assembly; although the current output type preamplifier can use the essential It is safe and explosion-proof, but the output signal is analog, which requires high detection instruments, and certain errors ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/02G01F1/32
Inventor 杨金岩李华刘福君许启兴王玉森
Owner 中国人民解放军第二炮兵装备研究院第三研究所