CN219302347U

CN219302347U - Trace moisture detector

Info

Publication number: CN219302347U
Application number: CN202222606256.XU
Authority: CN
Inventors: 邹妍
Original assignee: Shandong Dafeng Marine Technology Co ltd
Current assignee: Shandong Dafeng Marine Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-07-04
Anticipated expiration: 2032-09-30

Abstract

The utility model relates to a trace moisture detector, and belongs to the technical field of detection. Including detection mechanism, detection mechanism includes detection gas circuit and the bypass gas circuit of waiting to await measuring sample district intercommunication, detection gas circuit and the parallelly connected setting of bypass gas circuit, detection gas circuit includes first gas flowmeter, filtration membrane and electrolytic cell, filtration membrane locates the electrolytic cell along the upper reaches of gas flow direction, electrolytic cell includes electrode and ampere meter, bypass gas circuit includes the second gas flowmeter. The utility model has simple structure, low cost, simple operation and rapid detection.

Description

Trace moisture detector

Technical Field

The utility model relates to a trace moisture detector, and belongs to the technical field of detection.

Background

Among the factors affecting the quality of a refrigerator, the water content in a refrigeration system is a critical factor. The solubility of water in the refrigerant is quite low. Therefore, even a small amount of moisture enters the system, the saturated solubility is achieved, and the moisture is released. When the water content in the refrigeration system exceeds the standard, an ice blockage fault is caused. The "ice blockage" is that when water entering the system circulates along with the refrigerant in the refrigerating system, the high-pressure liquid refrigerant throttles and expands through a capillary tube, the pressure is reduced, the boiling evaporation and the temperature are reduced, the solubility of water is also reduced, part of water mixed in the liquid refrigerant is separated out, and a plurality of small ice particles are formed around the throttle hole. When the ice particles condense at the restriction site, the capillary outlet is blocked, i.e. an "ice plug" is formed.

The existing domestic and foreign standards mostly adopt a condensation method to measure the water content in a refrigeration system, namely, a vacuum pump is used for pumping out water vapor in the system, the water vapor is condensed into ice through a condenser at the temperature of minus 65 ℃ to minus 70 ℃, and then the ice is weighed. The method has complex system, time and complex operation, and has poor precision, and the refrigeration industry is not easy to implement.

The contrast analysis of parameters and prices is carried out on instruments developed based on various principles, and the sensitivity and measurement accuracy of the instruments based on a dew point method and a semiconductor laser spectrum absorption method are higher, but the popularization of the instruments is blocked due to the characteristics of complex structure, high price and difficult maintenance; the capacitance method has quick response and low price, but the core sensor needs to be calibrated and replaced frequently, thus preventing the long-term real-time online detection capability of the instrument; although the karl fischer method has higher sensitivity, the operation is complex, and chemical reagents need to be purified in advance, so that the difficulty is increased for the popularity of the instrument.

The prior art moisture detection sensor and moisture detection system (publication No. CN110261447 a) discloses a moisture detection sensor and a moisture detection system, the moisture detection sensor including: a processor, a first capacitor, a second capacitor and a temperature sensor respectively connected with the processor; the first capacitor and the second capacitor are different types of capacitors; the first capacitor is used for collecting a first capacitance value of a substance to be detected and sending the first capacitance value to the processor; the second capacitor is used for collecting a second capacitance value of the substance to be detected and sending the second capacitance value to the processor; the temperature sensor is used for collecting the temperature value of the substance to be detected and sending the temperature value to the processor; the processor is used for outputting moisture information (including moisture state information of the substance to be detected and/or moisture content information of the substance to be detected) corresponding to the first capacitance value, the second capacitance value and the temperature value. The moisture detection sensor in the prior art comprises two capacitors of different types and a temperature sensor, wherein capacitance values of substances to be detected are collected through the two capacitors of different types, temperature values of the substances to be detected are collected through the temperature sensor, and then moisture information of the substances to be detected is correspondingly output through a processor. The water content detection sensor in the prior art has high cost, cannot be directly connected into a household appliance refrigeration pipeline, and cannot adjust a detection interval according to a to-be-detected logistics.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model provides a novel trace moisture detector.

When the measured gas enters the electrolytic cell, the coating material with strong water absorption on the electrode fully absorbs the water in the gas, at the moment, proper voltage is applied to the electrolytic cell to generate electrolytic reaction, electrolytic current corresponding to the water concentration is generated in the electrolytic process, and the micro water content in the gas can be obtained by calculating through Faraday's law after the current value is measured.

The utility model is realized by adopting the following technical scheme:

the utility model provides a trace moisture detector, includes detection mechanism, detection mechanism include with the detection gas circuit and the bypass gas circuit of awaiting measuring sample district intercommunication, detection gas circuit and the parallelly connected setting of bypass gas circuit, detection gas circuit includes first gas flowmeter, filtration membrane and electrolytic cell, the upper reaches of electrolytic cell along the gas flow direction is located to filtration membrane, the electrolytic cell includes electrode and ampere meter, the bypass gas circuit includes the second gas flowmeter.

Further, the detection air path comprises a first proportional regulating valve, and the bypass air path comprises a second proportional regulating valve.

Further, a gas transmission mechanism is arranged at the upstream of the sample area to be detected along the gas flow direction, and the gas transmission mechanism comprises a pressure reducing valve.

Further, the detection gas circuit is provided with an electromagnetic valve.

Further, the sample area to be detected is a household appliance refrigerating equipment pipeline.

Further, the first gas flowmeter is electrically connected with the first proportional regulating valve through a controller, and the second gas flowmeter is electrically connected with the second proportional regulating valve through the controller.

When the measuring gas enters the electrolytic cell, the water absorption characteristic of the coating material on the electrode is utilized to fully absorb the water in the gas, at the moment, proper voltage is applied to the electrolytic cell, the electrode coating material and water in the electrolytic cell are subjected to electrolytic reaction, electrolytic current corresponding to the water concentration is generated in the electrolytic process, and the micro water content in the gas can be obtained through calculation by Faraday's law after the electrolytic current value is measured by the current meter.

The sample area to be measured can be a household appliance refrigerating equipment pipeline or a gas storage area;

the flowmeter is used for measuring the gas flow in the gas circuit and enabling the gas flow to reach a set flow value;

and the proportional control valve is used for controlling the gas proportion passing through the detection gas circuit and the bypass gas circuit. One path is a detection gas path, and the gas of the detection gas path enters the electrolytic cell for detection and analysis; the other path is a bypass gas path, so that the purpose is to increase the flow of the sample gas entering the gas path system, reduce the lag time and improve the quick response performance of the sensor;

the flow of the bypass gas circuit can be regulated by controlling the proportional regulating valve through the controller according to the flow value of the gas flowmeter, and the flow of the bypass gas circuit is generally controlled to be 5-10 times of the flow of the detection gas circuit. The purpose is to increase the flow of the measuring gas entering the gas circuit system, so as to reduce the lag time and improve the quick response performance of the sensor; regarding the influence of bypass flow on the performance of the electrolytic water sensor, the larger the bypass flow is, the more the measured value is close to the real water content of the sample gas.

And the flow of the detection gas circuit is also regulated by controlling the proportional regulating valve through the control mechanism according to the data of the gas flowmeter.

And the electromagnetic valve is used for opening and closing the air path during measurement.

And the filtering membrane is used for filtering impurities in the measurement gas, ensuring the purity of the gas entering the electrolytic cell and preventing the electrolytic cell from being invalid due to accumulation of the impurities in the electrolytic cell.

And the electrolytic cell is used for detecting the water in the measuring gas circuit.

And the electrode is used for electrolyzing the water in the measuring gas path, and when a proper voltage is applied to the electrode, the coating material on the electrode and the water are subjected to electrolytic reaction, and electrolytic current corresponding to the water concentration is generated in the electrolytic process.

The gas transmission mechanism is used for sending the gas in the sample area to be detected into the detection gas circuit and the bypass gas circuit; and the optional nitrogen cylinder is used for providing a dry air source, and nitrogen passes through the sample area to be detected and then carries the air to be detected into the detection air path and the bypass air path.

And the pressure reducing valve is used for reducing the pressure of the high-pressure gas from the gas conveying mechanism to obtain a gas pressure value suitable for detection.

The beneficial effects of the utility model are as follows:

1. the detection gas circuit and the bypass gas circuit are arranged, so that the flow of the sample gas entering the gas circuit system can be increased, the lag time is shortened, and the quick response performance of the sensor is improved;

2. the detection gas circuit and the bypass gas circuit are both provided with proportional regulating valves, and the gas flow passing through the two gas circuits can be regulated through the mutual matching of the first proportional regulating valve and the second proportional regulating valve, so that the detection interval of the trace moisture detector is improved;

3. the air conveying mechanism and the pressure reducing valve can adjust the air inlet pressure, so that the adaptability of the trace moisture detector is further improved;

4. the sample area to be measured can be a sample container or a household appliance refrigerating device pipeline, namely, the household appliance refrigerating pipeline can be directly connected into the sample area to be measured to form a trace moisture detector without disassembling a household appliance, and the operation is convenient.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

In the figure: 1. a gas delivery mechanism; 2. a pressure reducing valve; 3. a sample area to be measured; 4. a main air path; 5. a bypass gas path; 6. detecting an air path; 7. a first gas flow meter; 8. a first proportional control valve; 9. an electromagnetic valve; 10. a filtering membrane; 11. an electrolytic cell; 12. an electrode; 13. a second gas flow meter; 14. and a second proportional control valve.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings, in order to make the objects and technical solutions of the present utility model more apparent.

Embodiment one:

as shown in fig. 1, a trace moisture detector comprises a gas transmission mechanism 1 and a gas circuit, wherein the gas transmission mechanism 1 is communicated with the gas circuit, the gas circuit is divided into a detection gas circuit 6 and a bypass gas circuit 5 which are arranged in parallel, the detection gas circuit 6 is sequentially provided with a first gas flowmeter 7, a filtering membrane 10 and an electrolytic cell 11 along the gas flow direction, the electrolytic cell 11 comprises an electrode 12 and a ammeter, and the bypass gas circuit 5 comprises a second gas flowmeter 13. The coating material of the electrode 12 in the electrolytic cell 11 is P ₂ O ₅ 。

The working process of the embodiment is as follows: the gas transmission mechanism 1 sends the gas to be detected in the sample area 3 to the detection gas path 6 and the bypass gas path 5, the gas to be detected in the detection gas path 6 enters the first gas flowmeter 7 to obtain the flow parameter of the detection gas path 6, the gas to be detected passes through the filter membrane 10 to filter out impurities in the gas, the purity of the gas entering the electrolytic cell 11 is ensured, the electrode 12 in the electrolytic cell 11 electrolyzes the water in the coating material, and the electrolytic reaction is 4HPO ₃ →2H ₂ ↑+O ₂ ↑+2P ₂ O ₅ 。

The ammeter displays the current value, the electric quantity required by the electrolytic cell for electrolyzing out any substance 1mol is 96500C according to Faraday's law, and when the test gas continuously flows through the electrolytic cell, the moisture in the test gas is separated by P ₂ O5 absorbs and electrolyzes, so that if the measurement flow and the current generated by the electrolytic cell are known, the water concentration in the test gas can be calculated by a formula.

m＝Ite/96500

In the formula, I is an electrolysis current generated by an electrolytic cell, and the unit is (A); t is the time of continuous electrolysis of the electrolytic cell, and the unit is(s); m is the mass of water electrolyzed by the electrolytic cell in t seconds, and the unit is (g); e is the equivalent of moisture, and is usually 9.01g.

And integrating the electrolysis current value to obtain an integral curve, converting the electric quantity consumed by the electrolysis reaction by using the integral curve to obtain the water content of the gas of the detection gas circuit 6, adding the gas flow of the bypass gas circuit 5, and calculating to obtain the total water content of the gas of the sample area 3 to be detected.

Embodiment two:

the utility model provides a trace moisture detector, includes gas transmission mechanism 1 and gas circuit, and gas transmission mechanism 1 is nitrogen bottle and relief pressure valve 2, and gas transmission mechanism 1 and gas circuit intercommunication, and the gas circuit divide into the detection gas circuit 6 and the bypass gas circuit 5 of parallelly connected setting, and detection gas circuit 6 is equipped with first gas flowmeter 7, first proportional control valve 8, solenoid valve 9, filtration membrane 10 and electrolytic cell 11 along the gas flow direction in proper order, and electrolytic cell 11 includes electrode 12 and ampere meter, first gas flowmeter 7 is connected through the controller electricity with first proportional control valve 8, and bypass gas circuit 5 includes second gas flowmeter 13 and second proportional control valve 14, second gas flowmeter 13 and second proportional control valve 14 are connected through the controller electricity.

The working process of the embodiment is as follows: the nitrogen cylinder is used for providing a dry air source, the pressure reducing valve 2 is used for reducing the pressure of high-pressure air coming out of the nitrogen cylinder to obtain a gas pressure value suitable for detection, nitrogen is used for sending the gas to be detected in the sample area 3 to be detected into the detection gas circuit 6 and the bypass gas circuit 5, and the gas to be detected in the detection gas circuit 6 enters the first gas flowmeter 7 to obtain the flow value of the detection gas circuit 6. According to the flow value of the first gas flowmeter 7, the opening of the first proportional regulating valve 8 is regulated under the control of the controller, and the gas flow rate of the detection gas circuit 6 is strictly controlled below 70 ml/min. From theoretical and experimental analysis of the maximum flow rate problem of the measured flow rate, when the flow rate exceeds the critical value of 70ml/min, some water molecules pass through the electrolytic cell 11 without being adsorbed for electrolysis, and at this time, the electrolysis current no longer changes according to a linear rule. The gas to be measured enters the filter membrane 10 to filter out impurities in the gas and then enters the electrolytic cell 11, the electrode 12 in the electrolytic cell 11 electrolyzes the water in the coating material, and the ammeter displays the electrolysis current value of the corresponding relationship of the water concentration. According to the flow value of the second gas flowmeter 13, under the control of the controller, the opening of the second proportional regulating valve 14 is regulated, the gas flow rate of the bypass gas circuit 5 is controlled to be 5-10 times of the flow rate of the detection gas circuit 6, so that the flow rate of the sample gas entering the gas circuit system is increased, the lag time is reduced, and the quick response performance of the detector is improved.

In this embodiment, the sample area 3 to be measured may be a household appliance refrigeration device pipeline or a gas storage area;

the utility model can be widely applied to detection instrument occasions.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. The utility model provides a trace moisture detector, its characterized in that, includes detection mechanism, detection mechanism includes detection gas circuit and the bypass gas circuit of waiting to await measuring sample district intercommunication, detection gas circuit and the parallelly connected setting of bypass gas circuit, detection gas circuit includes first gas flowmeter, filtration membrane and electrolytic cell, filtration membrane locates the electrolytic cell along the upper reaches of gas flow direction, electrolytic cell includes electrode and ampere meter, the bypass gas circuit includes the second gas flowmeter.

2. The trace moisture meter according to claim 1, wherein the detection air path includes a first proportional adjustment valve and the bypass air path includes a second proportional adjustment valve.

3. The trace moisture meter according to claim 1, wherein the sample area to be measured is provided with a gas delivery mechanism upstream in a gas flow direction, the gas delivery mechanism comprising a pressure relief valve.

4. The trace moisture detector according to claim 1, wherein the detection air path is fitted with a solenoid valve.

5. The trace moisture meter according to claim 1, wherein the sample area to be measured is a household appliance refrigeration appliance conduit.

6. The trace moisture meter according to claim 2, wherein the first gas flow meter is electrically connected to the first proportional control valve via a controller, and the second gas flow meter is electrically connected to the second proportional control valve via a controller.