CN108760828B - Device for measuring liquid conductivity - Google Patents
Device for measuring liquid conductivity Download PDFInfo
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- CN108760828B CN108760828B CN201810929293.XA CN201810929293A CN108760828B CN 108760828 B CN108760828 B CN 108760828B CN 201810929293 A CN201810929293 A CN 201810929293A CN 108760828 B CN108760828 B CN 108760828B
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- 239000007788 liquid Substances 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims description 34
- 238000007789 sealing Methods 0.000 claims description 27
- 230000017525 heat dissipation Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/22—Measuring resistance of fluids
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- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
- Electrochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a device for measuring liquid conductivity, which comprises a measuring main body and a measuring component. The measuring body and the measuring component are assembled together, so that the device has small volume. The measured liquid flows in from the annular gap between the outer electrode and the inner electrode of the measuring component and flows out from the water outlet pipe, and the coaxiality between the inner electrode and the outer electrode can bring higher measuring precision. The contact pin assembly in the measuring component is directly connected with the electronic measuring plate and the electrode assembly, a longer measuring lead is not needed, and the influence of lead resistance on measuring precision is reduced to the greatest extent.
Description
Technical Field
The invention relates to the field of devices for conductivity measurement, in particular to a device for liquid conductivity measurement.
Background
According to the relationship, the measurement of the liquid conductivity is widely applied to a plurality of fields such as medicine, environmental protection, chemical industry and the like, the existing measurement mode is a sensor, a circulation device and a measuring instrument, the measured liquid flows in the circulation device, the sensor is arranged in the circulation device for measurement, and signals are transmitted to the measuring instrument through a measurement lead, and the measurement mode needs a plurality of devices, so that the integration degree is low, and the use is inconvenient. And the resistance of the measuring leads themselves can have an effect on the measurement accuracy.
Disclosure of Invention
The invention aims to provide a device for measuring liquid conductivity, which is small in size and accurate in measurement.
In order to solve the technical problems, the invention adopts the following technical scheme:
an apparatus for measuring the conductivity of a liquid, characterized by: comprising a measuring body and a measuring part; the measuring device comprises a measuring main body, a measuring pipe and a water outlet pipe, wherein the measuring pipe is vertically arranged, the water outlet pipe is horizontally communicated with the measuring pipe, the measuring pipe and the water outlet pipe are of a three-way pipe structure, one end of the measuring pipe is closed, and one side of the measuring main body is provided with a mounting groove; a measuring part including a measuring electrode assembly, a measuring assembly, and an output assembly; the electrode assembly is arranged in the measuring pipeline and comprises an outer electrode and an inner electrode which are coaxially arranged with the measuring pipeline, the outer surface of the outer electrode is adhered and fixed with the inner surface of the measuring pipeline, the inner electrode is arranged in the outer electrode, a uniform annular gap is reserved between the outer surface of the inner electrode and the inner surface of the outer electrode, one end of the inner electrode is fixed at the closed end of the measuring pipeline, and a sealing part which is sealed by pressing is arranged in the annular gap between the closed end of the measuring pipeline and the water inlet of the water outlet pipeline; the measuring assembly comprises an electronic measuring plate and a pin assembly, the electronic measuring plate is fixed in the mounting groove, the pin assembly comprises a first measuring pin, one end of which is fixed on the electronic measuring plate, the other end of which is fixed on the outer surface of the external electrode, and a second measuring pin, one end of which is fixed on the electronic measuring plate, the other end of which is fixed on the outer surface of the internal electrode, and the second measuring pin is positioned between the sealing part and the closed end of the measuring pipeline and is not in contact with the external electrode; the output assembly comprises a wire protecting sleeve for fixing the signal output wire of the electronic measuring plate and the measuring main body.
Further technical characteristics are that: the closed end of the measuring pipeline is provided with a pipe head plug for plugging the pipe orifice, the pipe head plug can be disassembled, a cylindrical groove coaxial with the measuring pipeline is formed in the inner surface of the pipe head plug, and one end of the inner electrode is in interference fit with the groove of the pipe head plug.
Further technical characteristics are that: the measuring assembly is further provided with a temperature measuring instrument, the temperature measuring instrument is located between the electronic measuring plate and the external electrode, a temperature detection part of the temperature measuring instrument is in contact with the outer surface of the external electrode, and a signal output end of the temperature measuring instrument is connected with the electronic measuring plate.
Further technical characteristics are that: the device is also provided with a heat dissipation baffle, and the heat dissipation baffle is fixed on the notch of the installation groove and seals the installation groove.
Further technical characteristics are that: the radial inner and outer surfaces of the sealing component are provided with a plurality of sealing rings for sealing.
Further technical characteristics are that: the sealing part is provided with a slope which is inclined inwards in the radial direction at the position corresponding to the water inlet of the water outlet pipeline.
Further technical characteristics are that: the outer surface of the outer electrode is in interference fit with the inner surface of the measuring pipeline and is fixed through radial concave-convex fit.
Further technical characteristics are that: the open ends of the measuring pipeline and the water outlet pipeline are connected with quick connectors.
Further technical characteristics are that: the diameters of the first measuring pin and the second measuring pin are 1-2 mm, and the heights are 5-8 mm.
Further technical characteristics are that: the first measuring pin is fixed with the external electrode, and the second measuring pin is fixed with the internal electrode by adopting 5000-8000A current welding.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
when the outer electrode, the inner electrode and the measuring pipeline are coaxially arranged, a uniform annular gap is formed between the outer electrode and the inner electrode, so that liquid to be measured can uniformly flow in, and the measuring precision is higher. And the annular gap between the outer electrode and the inner electrode is internally provided with a sealing component for pressing and sealing, so that the coaxiality between the inner electrode and the outer electrode can be ensured because the radial stress is uniform while the sealing function is realized.
The measuring main body and the measuring component are assembled together, so that the device is small in size and convenient to use, the measuring component is directly connected with the electronic measuring plate and the electrode assembly by adopting the contact pin assembly, a longer measuring lead is not required, and the influence of lead resistance on measuring precision is reduced to the greatest extent.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic cross-sectional view of the present invention;
fig. 2 is an isometric schematic drawing of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1 to 2, an apparatus for measuring the conductivity of a liquid includes a measuring body 1 and a measuring member.
The measuring main body 1 is provided with a measuring pipeline 11 which is vertically arranged and a water outlet pipeline 12 which is horizontally communicated with the measuring pipeline 11, the measuring pipeline 11 and the water outlet pipeline 12 are of a three-way pipe structure, one end of the measuring pipeline 11 is closed, and one side of the measuring main body 1 is provided with a mounting groove 13.
And the measuring component comprises a measuring electrode assembly, a measuring assembly and an output assembly. The electrode assembly is arranged in the measuring pipeline 11 and comprises an outer electrode 211 and an inner electrode 212 which are coaxially arranged with the measuring pipeline 11, the outer surface of the outer electrode 211 is fixedly attached to the inner surface of the measuring pipeline 11, the inner electrode 212 is arranged in the outer electrode 211, a uniform annular gap 214 is formed between the outer surface of the inner electrode 212 and the inner surface of the outer electrode 211, one end of the inner electrode 212 is fixed to the closed end of the measuring pipeline 11, and a sealing part 213 which is sealed by pressing is arranged in the annular gap 214 between the closed end of the measuring pipeline 11 and the water inlet of the water outlet pipeline 12.
When the outer electrode 211, the inner electrode 212 and the measuring pipeline 11 are coaxially arranged, a uniform annular gap is formed between the outer electrode 211 and the inner electrode 212, so that the liquid to be measured can uniformly flow in, and the measuring precision is higher. And a sealing member 213 for pressing and sealing is provided in the annular gap between the outer electrode 211 and the inner electrode 212, so that the coaxiality between the inner electrode 212 and the outer electrode 211 is ensured because the radial stress is uniform while the sealing function is realized.
The measuring assembly comprises an electronic measuring plate 221 and a pin assembly, wherein the electronic measuring plate 221 is fixed in the mounting groove 13, the pin assembly comprises a first measuring pin 2222 with one end fixed on the electronic measuring plate 221 and the other end fixed on the outer surface of the outer electrode 211, and a second measuring pin 2221 with one end fixed on the electronic measuring plate 221 and the other end fixed on the outer surface of the inner electrode 212, and the second measuring pin 2221 is positioned between the sealing part 213 and the closed end of the measuring pipeline 11 and is not in contact with the outer electrode 211. The output assembly includes a wire sheath 231 for fixing the signal output wire of the electronic measuring board 221 with the measuring body 1.
The measuring main body 1 and the measuring component are assembled together, so that the device is small in size and convenient to use, and the device adopts the contact pin component to directly connect the electronic measuring plate 221 and the electrode component, does not need to use a longer measuring lead, and furthest reduces the influence of lead resistance on measuring precision.
To accomplish the measurement of the liquid conductivity, the following steps are required:
firstly, inputting the liquid to be measured through the open end of the measuring pipeline 11, and flowing out through the open end of the water outlet pipeline 12;
second, the electronic measuring plate 221 is started to measure;
third, after the measurement is completed, the input of the electronic measurement board 221 and the measured liquid is stopped;
fourth, clean water is introduced through the open end of the measuring pipe 11 and flows out through the open end of the water outlet pipe 12.
After the flushing is completed, the above steps are repeated to measure the conductivity of other liquids.
Preferably, the closed end of the measuring pipeline 11 is provided with a pipe head plug 14 for plugging the pipe orifice, the pipe head plug 14 can be disassembled, a cylindrical groove coaxial with the measuring pipeline 11 is formed in the inner surface of the pipe head plug 14, one end of the inner electrode 212 is in interference fit with the groove of the pipe head plug 14, the structure is simple to process, one end of the inner electrode 212 is in interference fit with the groove of the pipe head plug 14, and coaxiality of the inner electrode 212 and the measuring pipeline 11 is guaranteed. At the same time, the outer surface of the tube head plug 14 and the inner surface of the measuring tube 11 are fixed by radial concave-convex fit, so that the axial movement of the tube head plug 14 can be prevented, that is, the axial stability of the inner electrode 212 is increased.
Since the conductivity of the liquid is closely related to the temperature, in order to further increase the measurement accuracy, the measurement assembly is further provided with a temperature measuring instrument 4, the temperature measuring instrument 4 is positioned between the electronic measuring plate 221 and the external electrode 211, the temperature detecting part of the temperature measuring instrument 4 is contacted with the external surface of the external electrode 211, the signal output end of the temperature measuring instrument 4 is connected with the electronic measuring plate 221, and the influence of the temperature on the measurement result is eliminated by the setting of the program of the electronic measuring plate 221
The device is also provided with the heat dissipation baffle plate 5, the heat dissipation baffle plate 5 is fixed on the notch of the mounting groove 13 and enables the mounting groove 13 to be closed, the structure can prevent air from corroding the electronic measurement plate 221, and heat generated when the electronic measurement plate 221 works can be dissipated in time, so that the heat is reduced to influence the measurement accuracy.
In order to prevent the leakage of the liquid to be measured from corroding other parts, the radially inner and outer surfaces of the sealing member 213 are provided with a plurality of seal rings 2131 for sealing.
Preferably, the inner electrode 212 is in a two-stage stepped shaft structure, and comprises a first shaft which is in interference fit with a groove of the tube head plug 14 and has a smaller area, and a second shaft which is connected with the first shaft and has a larger area, the sealing part 213 is sleeved on the first shaft, the axial fixation is performed through the shaft end of the second shaft and an axial retainer 214 arranged on the first shaft, the sealing part 213 and the outer electrode 211 are provided with slopes for positioning, the structural form is reliable and convenient to assemble, and the sealing ring is made of high-insulation materials.
Preferably, the sealing member 213 is provided with a slope inclined radially inwards at a position corresponding to the water inlet of the water outlet pipeline 12, so that turbulence and liquid accumulation of the measured liquid can be prevented, and cleaning is facilitated.
Preferably, the outer surface of the outer electrode 211 is in interference fit with the inner surface of the measuring pipeline 11 and is fixed by radial concave-convex fit, so that the outer electrode 211 can be firmly fixed, and the sealing effect between the outer surface of the outer electrode 211 and the inner surface of the measuring pipeline 11 can be improved.
Preferably, the open ends of the measuring pipeline 11 and the water outlet pipeline 12 are connected with the quick connector 6, so that the switching between the input device of the measured liquid and the clean water input device can be facilitated, and the measuring time can be greatly saved when the conductivities of various liquids are measured.
To ensure transmission of the measurement signals, the first measurement pin 2222 and the second measurement pin 2221 have a diameter of 1 to 2mm and a height of 5 to 8mm. The electronic measurement board 221 is provided with pin openings, which are directly inserted into the first measurement pin 2222 and the second measurement pin 2221.
Preferably, the fixing of the first measurement pin 2222 and the external electrode 211 and the fixing of the second measurement pin 2221 and the internal electrode 212 are both performed by using 5000-8000A of current welding, so that the impedance can be reduced by high current welding, and the welded contact point is stable.
The foregoing is only a preferred embodiment of the present invention, and any and all simple modifications, variations and equivalents of the present invention will fall within the scope of the present invention.
Claims (7)
1. An apparatus for measuring the conductivity of a liquid, characterized by: comprises a measuring body (1) and a measuring part;
the measuring main body (1) is provided with a measuring pipeline (11) which is vertically arranged and a water outlet pipeline (12) which is horizontally communicated with the measuring pipeline (11), the measuring pipeline (11) and the water outlet pipeline (12) are of a three-way pipe structure, one end of the measuring pipeline (11) is closed, and one side of the measuring main body (1) is provided with a mounting groove (13);
a measuring part including an electrode assembly, a measuring assembly, and an output assembly;
wherein,,
the electrode assembly is arranged in the measuring pipeline (11) and comprises an outer electrode (211) and an inner electrode (212) which are coaxially arranged with the measuring pipeline (11), the outer surface of the outer electrode (211) is adhered and fixed with the inner surface of the measuring pipeline (11), the inner electrode (212) is arranged in the outer electrode (211), a uniform annular gap (214) is formed between the outer surface of the inner electrode (212) and the inner surface of the outer electrode (211), one end of the inner electrode (212) is fixed at the closed end of the measuring pipeline (11), and a sealing part (213) which is sealed by pressing is arranged in the annular gap (214) between the closed end of the measuring pipeline (11) and the water inlet of the water outlet pipeline (12);
the measuring assembly comprises an electronic measuring plate (221) and a pin assembly, wherein the electronic measuring plate (221) is fixed in the mounting groove (13), the pin assembly comprises a first measuring pin (2222) with one end fixed on the electronic measuring plate (221) and the other end fixed on the outer surface of the external electrode (211), and a second measuring pin (2221) with one end fixed on the electronic measuring plate (221) and the other end fixed on the outer surface of the internal electrode (212), and the second measuring pin (2221) is positioned between the sealing part (213) and the closed end of the measuring pipeline (11) and is not in contact with the external electrode (211);
the output assembly comprises a wire protection sleeve (231) for fixing a signal output wire of the electronic measuring plate (221) and the measuring main body (1);
the closed end of the measuring pipeline (11) is provided with a pipe head plug (14) for plugging a pipe orifice, the pipe head plug (14) can be disassembled, the inner surface of the pipe head plug is provided with a cylindrical groove coaxial with the measuring pipeline (11), and one end of the inner electrode (212) is in interference fit with the groove of the pipe head plug (14);
the radial inner and outer surfaces of the sealing component (213) are provided with a plurality of sealing rings (2131) for sealing;
the sealing part (213) is provided with a slope which is inclined inwards in the radial direction at the position corresponding to the water outlet of the external electrode (211).
2. An apparatus for liquid conductivity measurement according to claim 1, wherein: the measuring assembly is further provided with a temperature measuring instrument (4), the temperature measuring instrument (4) is located between the electronic measuring plate (221) and the external electrode (211), a temperature detection part of the temperature measuring instrument (4) is in contact with the outer surface of the external electrode (211), and a signal output end of the temperature measuring instrument (4) is connected with the electronic measuring plate (221).
3. An apparatus for liquid conductivity measurement according to claim 1, wherein: the device is also provided with a heat dissipation baffle (5), and the heat dissipation baffle (5) is fixed on the notch of the installation groove (13) and seals the installation groove (13).
4. An apparatus for liquid conductivity measurement according to claim 1, wherein: the outer surface of the outer electrode (211) is in interference fit with the inner surface of the measuring pipeline (11) and is fixed through radial concave-convex fit.
5. An apparatus for liquid conductivity measurement according to claim 1, wherein: the open ends of the measuring pipeline (11) and the water outlet pipeline (12) are connected with a quick connector (6).
6. An apparatus for liquid conductivity measurement according to claim 1, wherein: the diameters of the first measuring pin (2222) and the second measuring pin (2221) are 1-2 mm, and the heights are 5-8 mm.
7. An apparatus for liquid conductivity measurement according to claim 1, wherein: the first measurement pin (2222) is fixed with the outer electrode (211), and the second measurement pin (2221) is fixed with the inner electrode (212) by adopting 5000-8000A current welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810929293.XA CN108760828B (en) | 2018-08-15 | 2018-08-15 | Device for measuring liquid conductivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810929293.XA CN108760828B (en) | 2018-08-15 | 2018-08-15 | Device for measuring liquid conductivity |
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| Publication Number | Publication Date |
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| CN108760828A CN108760828A (en) | 2018-11-06 |
| CN108760828B true CN108760828B (en) | 2023-07-28 |
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| CN201810929293.XA Active CN108760828B (en) | 2018-08-15 | 2018-08-15 | Device for measuring liquid conductivity |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507485B (en) * | 2018-12-21 | 2021-08-13 | 重庆大学 | Liquid dielectric conductivity measurement system |
| CN110057873B (en) * | 2019-04-24 | 2021-05-28 | 重庆科技学院 | High-temperature high-pressure steam dryness online monitoring system and method |
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| CN108760828A (en) | 2018-11-06 |
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