阅读说明：本技术 一种定性和定量一体的检漏仪 (Qualitative and quantitative integrated leak detector ) 是由 游骏标 刘运柯 林芬 于 2021-07-06 设计创作，主要内容包括：本发明公开了一种定性和定量一体的检漏仪,包括MCU控制器、锂电充电管理及电源模块、定性传感器探头、定量SF6传感器、气泵控制模块、数据存储模块、无线数据通迅射频433M模块、液晶显示模块、按键输入模块、声光报警模块以及温湿度传感模块,所述锂电充电管理及电源模块分别给其他模块供电,本产品可实现在0-2000ppm或更高浓度下快速定位漏点,又可以进一步精确的测量泄露值,并做出相应的专家诊断,判定设备合格或不合格；有效的提高了工作人员的效率。(The invention discloses a qualitative and quantitative integrated leak detector, which comprises an MCU (microprogrammed control Unit) controller, a lithium battery charging management and power supply module, a qualitative sensor probe, a quantitative SF6 sensor, a gas pump control module, a data storage module, a wireless data communication radio frequency 433M module, a liquid crystal display module, a key input module, an acousto-optic alarm module and a temperature and humidity sensing module, wherein the lithium battery charging management and power supply module respectively supplies power to other modules; the efficiency of staff has effectively been improved.)

1. The utility model provides a qualitative and quantitative integrative leak detector, includes MCU controller, lithium electricity management and power module that charges, qualitative sensor probe, quantitative SF6 sensor, air pump control module, data storage module, wireless data communication radio frequency 433M module, liquid crystal display module, button input module, audible and visual alarm module and temperature and humidity sensing module, a serial communication port, lithium electricity management and power module of charging respectively give other module power supplies, and the MCU controller still connects qualitative sensor probe, quantitative SF6 sensor, air pump control module, data storage module, wireless data communication radio frequency 433M module, liquid crystal display module, button input module, audible and visual alarm module and temperature and humidity sensing module respectively, and air pump control still connects qualitative sensor probe and quantitative SF6 sensor.

2. The leak detector of claim 1, wherein the lithium battery charge management and power module comprises a 12V boost power supply and a 5V/3.3V power supply.

3. A qualitative and quantitative integrated leak detector as claimed in claim 1, wherein the qualitative sensor probe is connected to a qualitative sensor fast capture circuit, the qualitative sensor fast capture circuit comprises a high frequency transformer T1 and an interface P7, a negative high voltage pulse is generated at the winding 6 end of the high frequency transformer T1, a diode D1, a diode D7, a diode D5, a resistor R29, a resistor R27, and a resistor R26 are connected to a socket P7, and form a loop through the probe and AGND, windings 7, 9, 11, and 12 of the high frequency transformer T1 form a fixed pulse through R46, a potentiometer VR1, a diode VD1, a capacitor C14, a capacitor C16, a resistor R45, a resistor R55, a transistor Q14, a transistor Q10, a diode D18, a resistor R54, a resistor R58, a capacitor C17, and a capacitor C13, and the amplitude and frequency of the pulse are adjusted by the potentiometer VR 1; the interface P7 is connected with the sensor probe and is led to the outside of the instrument by a lead; diode D18 provides a freewheeling circuit for transistor Q10.

4. The leak detector according to claim 3, wherein the qualitative sensor probe, the quantitative SF6 sensor and the temperature and humidity sensor module are connected with a precise AD acquisition circuit, the precise AD acquisition circuit comprises an operational amplifier U2B, an operational amplifier U2C and an operational amplifier U2D, a pin 5 of the operational amplifier U2D is connected with a resistor RN D, a pin 6 of the operational amplifier U2D is connected with a resistor RN D, a capacitor C D and a resistor R D, the other end of the capacitor C D is connected with a resistor R D and a pin 7 of the operational amplifier U2D, the other end of the resistor R D is connected with a pin 10 of the capacitor C D and the operational amplifier U2D, a pin 9 of the operational amplifier U2D is connected with the resistor R D, the capacitor C D and the resistor R D are connected with a fixed end of the potentiometer Z D, one fixed end of the potentiometer Z D is connected with a power supply V, the other end of the capacitor C D is connected with a fixed end of the capacitor R D and a fixed end of the capacitor R D, and the other end of the capacitor R D are connected with a fixed end of the capacitor C D and a fixed end of the capacitor R D, the other end of the capacitor C8 is connected with the other end of the resistor R12, the resistor R13 and the pin 8 of the operational amplifier U2C, the other end of the resistor R13 is connected with the capacitor C9 and the pin 12 of the operational amplifier U2D, the pin 14 of the operational amplifier U2D is connected with the pin 13 of the operational amplifier U2D and the resistor R14, and the other end of the resistor R14 is connected with the output terminal Sig.

5. A qualitative and quantitative integrated leak detector as claimed in claim 4, wherein said op-amp U2B constitutes a first stage filter loop.

6. A qualitative and quantitative integrated leak detector as claimed in claim 4, wherein said op amp U2C secondary filter loop.

7. A qualitative and quantitative integrated leak detector as claimed in claim 4, wherein said U2D constitutes a signal follower output circuit.

Technical Field

The invention relates to the technical field of detection, in particular to a qualitative and quantitative integrated leak detector.

Background

SF6 has excellent arc extinguishing performance and is widely used in power systems. The SF6 gas leak detector has important effect in links such as electric power safety production, inspection, patrol and examine, along with the improvement of product voltage level, has provided higher requirement to precision, stability, the convenient to use nature of leak detector device. Especially, the operation and maintenance staff realize quick positioning in a plurality of complex devices and can accurately detect the leakage value and judge whether the air chamber is qualified or not, thereby having important significance.

At present, SF6 gas leak detectors at home and abroad have various detection schemes: such as photoacoustic spectroscopy detection principle, high frequency magnetic field ionization, negative ion trapping, electron trapping (ECD), etc. The leak detection equipment produced by the schemes is generally large in size, and special auxiliary gas is needed, and an alternating current power supply is needed in some cases. Some are in laboratory level mostly, inconvenient carrying has very strong limitation to the operation of patrolling and examining of numerous equipment in scene such as SF6 equipment such as looped netowrk cabinet, GIS, circuit breaker. The infrared double wave method (NDIR) has the advantages of simple structure, low cost, small cross interference, good precision, portability and the like. The method is widely applied to gas leakage detection of portable SF6 equipment.

Although the qualitative sensor on the current market can quickly locate the leakage point, the response is poor under large concentration, no specific numerical value is displayed and output, and the basis for judging whether the air chamber is qualified cannot be provided.

The portable leak detector of infrared (NDIR) method used at home and abroad at present has the following problems: the minimum detection amount exceeds 5ppm, the linearity is poor under low solubility, the precision deviation is large under high concentration, the repeatability is poor, the precision is not good under high and low temperature environments, and the response time and the recovery time are long. When the equipment is subjected to leak detection, the gas production nozzle of the instrument needs to be moved at a very slow speed, and the working efficiency is greatly reduced.

Disclosure of Invention

The present invention aims to provide a leak detector integrating the qualitative and quantitative functions so as to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a qualitative and quantitative integrative leak detector, includes MCU controller, lithium electricity management and power module that charges, qualitative sensor probe, quantitative SF6 sensor, air pump control module, data storage module, wireless data communication radio frequency 433M module, liquid crystal display module, key input module, audible-visual alarm module and humiture sensing module, lithium electricity management and power module that charges respectively give other module power supplies, and the MCU controller still connects qualitative sensor probe, quantitative SF6 sensor, air pump control module, data storage module, wireless data communication radio frequency 433M module, liquid crystal display module, key input module, audible-visual alarm module and humiture sensing module respectively, and air pump control still connects qualitative sensor probe and quantitative SF6 sensor.

As a further technical scheme of the invention, the lithium battery charging management and power supply module comprises a 12V boosting power supply and a 5V/3.3V power supply.

As a further technical solution of the present invention, the qualitative sensor probe is connected to a qualitative sensor fast capturing circuit, the qualitative sensor fast capturing circuit includes a high-frequency transformer T1 and an interface P7, a winding 6 end of the high-frequency transformer T1 generates negative-polarity high-voltage pulses, the negative-polarity high-voltage pulses are connected to a socket P7 through a diode D1, a diode D7, a diode D5, a resistor R29, resistors R27, and R26, and form a loop through the probe and AGND, windings 7, 9, and 11, 12 of the high-frequency transformer T1 form fixed pulses through R46, a potentiometer VR1, a diode VD1, a capacitor C14, a capacitor C16, a resistor R45, a resistor R55, a transistor Q14, a transistor Q10, a diode D18, a resistor R54, a capacitor C54, and the amplitude and frequency of the pulses are adjusted by the potentiometer VR 54; the interface P7 is connected with the sensor probe and is led to the outside of the instrument by a lead; diode D18 provides a freewheeling circuit for transistor Q10.

As a further technical scheme of the invention, a precise AD acquisition circuit is connected to the qualitative sensor probe, the quantitative SF sensor and the temperature and humidity sensing module and comprises an operational amplifier U2, an operational amplifier U2 and an operational amplifier U2, a pin 5 of the operational amplifier U2 is connected with a resistor RN, a pin 6 of the operational amplifier U2 is connected with a resistor RN, a capacitor C and a resistor R, the other end of the capacitor C is connected with a resistor R and a pin 7 of the operational amplifier U2, the other end of the resistor R is connected with a capacitor C and a pin 10 of the operational amplifier U2, a pin 9 of the operational amplifier U2 is connected with a resistor R, a capacitor C and a resistor R, the other end of the resistor R is connected with a sliding end of a potentiometer Z, one fixed end of the potentiometer Z is connected with the capacitor C and a power supply V + through the resistor R, the other fixed end of the potentiometer Z is connected with the resistor R and the capacitor C, the other end of the resistor R, The resistor R13 and a pin 8 of the operational amplifier U2C, the other end of the resistor R13 is connected with the capacitor C9 and a pin 12 of the operational amplifier U2D, a pin 14 of the operational amplifier U2D is connected with a pin 13 of the operational amplifier U2D and the resistor R14, and the other end of the resistor R14 is connected with the output end Sig.

As a further technical scheme of the invention, the operational amplifier U2B forms a first-stage filtering loop.

As a further technical scheme of the invention, the operational amplifier U2C secondary filter loop.

As a further technical scheme of the invention, the U2D forms a signal following output circuit.

Compared with the prior art, the invention has the beneficial effects that: the product combines the characteristics of a qualitative leak detector and a quantitative leak detector into a whole on the basis of combining the advantages of a plurality of leak detection schemes, and can realize quick positioning and high-precision measurement of SF6 equipment leakage gas. Namely, the negative polarity capture method is used for realizing rapid positioning to form the qualitative sensor of the product; and then the actual numerical value is measured with high precision by matching with an infrared (NDIR) quantitative sensor.

Drawings

FIG. 1 is an overall system diagram of the present invention.

Fig. 2 is a qualitative sensor fast acquisition circuit diagram.

Fig. 3 is a circuit diagram of a precision AD acquisition circuit.

FIG. 4 is a circuit diagram of a precision reference power supply.

Fig. 5 is a 485 level to TTL communication circuit diagram of the infrared sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, example 1: a qualitative and quantitative integrated leak detector comprises an MCU controller, a lithium battery charging management and power supply module, a qualitative sensor probe, a quantitative SF6 sensor, an air pump control module, a data storage module, a wireless data communication radio frequency 433M module, a liquid crystal display module, a key input module, an audible and visual alarm module and a temperature and humidity sensing module, lithium electricity management and power module of charging respectively for other module power supplies, the MCU controller still connects qualitative sensor probe respectively, quantitative SF6 sensor, the air pump control module, the data storage module, wireless data communication radio frequency 433M module, the liquid crystal display module, the button input module, audible-visual alarm module and temperature and humidity sensing module, qualitative sensor probe and quantitative SF6 sensor are still connected in air pump control, lithium electricity management of charging and power module include 12V power and the 5V 3.3V power that steps up.

The probe of the qualitative sensor is connected with a rapid capturing circuit of the qualitative sensor, the rapid capturing circuit of the qualitative sensor comprises a high-frequency transformer T1 and an interface P7, a winding 6 end of a high-frequency transformer T1 generates negative-polarity high-voltage pulses, a diode D1, a diode D7, a diode D5, a resistor R29, a resistor R27 and a resistor R26 are connected to a socket P7 and form a loop through the probe and AGND, windings 7, 9 and 11, 12 of the high-frequency transformer T1 form fixed pulses through an R46, a potentiometer VR1, a diode VD1, a capacitor C14, a capacitor C16, a resistor R45, a resistor R55, a triode Q14, a triode Q10, a diode D18, a resistor R54, a resistor R58, a capacitor C17 and a capacitor C13, and the amplitude and the frequency of the pulses are adjusted by the potentiometer VR 1; the interface P7 is connected with the sensor probe and is led to the outside of the instrument by a lead; diode D18 provides a freewheeling circuit for transistor Q10.

The high voltage signal required by the sensor can be sensed at the high voltage side; when gas is detected, the potential of the high-voltage circuit changes, the level of a winding 6 pin of the T1 is caused to change, and the high-voltage circuit is output through R30, R33, C13, C11, R31, R118, C37 and C7; the circuit is provided with a 3-stage RC filter circuit, so that a noise signal can be primarily filtered, and a detection circuit at the rear end is more stable; before the output of the operational amplifier circuit is output to the next stage of operational amplifier circuit, an amplitude limiting protection circuit (D25, D26) is required to be added; when the surge voltage exceeds VCC, GND, the level of the signal line is clamped between these two levels, and no loss occurs to the subsequent stage.

The probe of the qualitative sensor, the quantitative SF sensor and the temperature and humidity sensing module are connected with a precise AD acquisition circuit, the precise AD acquisition circuit comprises an operational amplifier U2, an operational amplifier U2 and an operational amplifier U2, a pin 5 of the operational amplifier U2 is connected with a resistor RN, a pin 6 of the operational amplifier U2 is connected with a resistor RN, a capacitor C and a resistor R, the other end of the capacitor C is connected with a resistor R and a pin 7 of the operational amplifier U2, the other end of the resistor R is connected with a capacitor C and a pin 10 of the operational amplifier U2, a pin 9 of the operational amplifier U2 is connected with a resistor R, a capacitor C, a resistor R, a capacitor C and a resistor R, the other end of the resistor R is connected with a sliding end of a potentiometer Z, one fixed end of the potentiometer Z is connected with the capacitor C and a power supply V + through the resistor R, the other fixed end of the potentiometer Z is connected with the resistor R and the capacitor C, the other end of the resistor R is connected with the ground, the other end of the capacitor C is connected with the other end of the resistor R and a pin 8 of the operational amplifier U2, the other end of the resistor R13 is connected with the capacitor C9 and the pin 12 of the operational amplifier U2D, the pin 14 of the operational amplifier U2D is connected with the pin 13 of the operational amplifier U2D and the resistor R14, and the other end of the resistor R14 is connected with the output end Sig.

The operational amplifier U2B forms a first stage filter loop. And an operational amplifier U2C secondary filter loop. U2D constitutes a signal following output circuit.

The operational amplifier in the circuit is a low-noise operational amplifier, the first 2-stage operational amplifier further filters and amplifies signals, and noise caused by a high-voltage circuit is filtered; therefore, the method is vital to AD detection of the single chip microcomputer, signal concentration misjudgment caused by mistriggering is avoided, the filtering period on software is shortened greatly, and the response time is shortened greatly.

In embodiment 2, on the basis of embodiment 1, the circuit part has a high-voltage circuit, and the working mechanism is the transformation principle. Therefore, larger interference noise is generated on the ground level and the power line, so that the signal level must be synchronized to the middle point voltage, the system determines that 1.65V is the zero point voltage, the interference of noise signals caused by the fluctuation of the power source and the ground is effectively avoided, the temperature drift is small in the whole temperature range, and the system is more stable.

The level conversion circuit ensures that the system has stronger adaptability to the sensor, and the infrared sensor with high quality is selected and matched with the qualitative quick detection circuit, so that the infrared sensor can enlarge the measuring range by 1000ppm, 2000ppm and more. The communication output interface modes of various sensors in the market are different, and the sensors have TTL level and RS485 level; the hardware of the machine adopts a compatible design, and can be compatible with the 2 modes, when the output of the sensor is TTL level, the conversion circuit needs to be added, and when the sensor directly outputs RS485 signals, the circuit does not need to be added; thus, the selectivity of the instrument is flexible. Not only can realize quick positioning, but also can realize accurate detection in a full-range.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.