CN223243864U - High-precision liquid leakage detection equipment - Google Patents
High-precision liquid leakage detection equipmentInfo
- Publication number
- CN223243864U CN223243864U CN202422754992.9U CN202422754992U CN223243864U CN 223243864 U CN223243864 U CN 223243864U CN 202422754992 U CN202422754992 U CN 202422754992U CN 223243864 U CN223243864 U CN 223243864U
- Authority
- CN
- China
- Prior art keywords
- wire
- coupled
- resistor
- constant current
- current source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The utility model provides high-precision liquid leakage detection equipment which comprises a constant current source output circuit, a liquid leakage induction line and a control unit, wherein the constant current source output circuit is used for outputting constant current, the liquid leakage induction line comprises a switch unit, a first detection branch and a second detection branch, the first detection branch is coupled and connected with the output end of a constant current source output end circuit and is coupled and connected to a grounding end through the switch unit, a power supply is coupled and connected to the second detection branch through the switch unit and is grounded, and the control unit is coupled and connected with the constant current source output circuit, the switch unit, the first detection branch and the second detection branch. The device outputs constant and high-precision current through the constant current source output circuit, is less influenced by current fluctuation in the detection process when detecting leakage, and can realize leakage alarm more accurately.
Description
Technical Field
The utility model relates to the technical field of measurement and control equipment, in particular to high-precision liquid leakage detection equipment.
Background
In the place with more devices such as the existing data center, the electronic devices usually need to be cooled by using a water cooling system, the water cooling system carries away the heat of the devices through a liquid cooling line to cool, the cooling liquid is a conducting medium, when the liquid cooling line is aged or damaged to cause leakage of the cooling liquid, a conducting path is formed between lines with different potentials on a circuit board, so that electric short circuits are caused, large currents are generated instantly due to the short circuits, electronic elements are damaged, and safety accidents such as fire disasters can be caused.
In the prior art, the leakage induction line is matched with the constant voltage source circuit, so that the leakage can be judged by detecting the voltage when the cooling liquid leaks and permeates the leakage induction line, however, the limitation of voltage detection is larger, the current interference is easy, and the high-precision liquid leakage detection requirement is difficult to meet.
Disclosure of utility model
Aiming at the defects of the prior art, the utility model provides high-precision liquid leakage detection equipment, which can reduce the interference during detection and realize more accurate leakage alarm.
The technical scheme of the utility model is realized as follows:
a high-precision liquid leakage detection device includes
A constant current source output circuit for outputting a constant current;
the leakage induction line comprises a switch unit, a first detection branch and a second detection branch, wherein the first detection branch is coupled with the output end of the constant current source output end circuit and is coupled to the ground end through the switch unit;
and the control unit is coupled and connected with the constant current source output circuit, the switch unit, the first detection branch and the second detection branch.
The further technical scheme of this embodiment is that the constant current source output circuit includes a negative feedback circuit for detecting the monitoring output current.
The further technical scheme of the embodiment is that the constant current source output circuit comprises an operational amplifier U1, an operational amplifier U2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a load resistor RL, wherein the inverting input end of the operational amplifier U1 is grounded through the resistor R1 and is coupled to the output end through the resistor R2, the non-inverting input end of the operational amplifier U1 is coupled with a 3.3V power supply through the resistor R3, the output end of the constant current source output circuit is coupled to the non-inverting input end of the first detection branch and the operational amplifier U2 through the load resistor RL, the inverting input end of the operational amplifier U2 is coupled with the output end, and the output end of the operational amplifier U2 is coupled to the non-inverting input end of the operational amplifier U2 through the resistor R4.
The further technical scheme of this embodiment is that the first detection branch includes a first wire and a second wire that are connected, the first wire is coupled with an output end of the constant current source output circuit, the second wire is coupled with a ground end through the switch unit, the second detection branch includes a third wire and a fourth wire that are connected, the third wire is coupled to a power supply through the switch unit, the fourth wire is connected with the ground end, outer skins of the first wire and the third wire are made of insulating waterproof materials, and outer skins of the second wire and the fourth wire are made of conductive silica gel.
According to a further technical scheme of the embodiment, the first wire, the second wire, the third wire and the fourth wire are adjacently arranged.
According to a further technical scheme of the embodiment, the first detection branch further comprises a reference resistor R5, and the second wire is coupled to the ground terminal through the resistor R5.
According to a further technical scheme of the embodiment, the second detection branch further comprises a reference resistor R6, the fourth wire is coupled to the grounding end through the resistor R6, and the precision of the resistor R6 is 0.1%.
According to a further technical scheme of the embodiment, the switch unit comprises a first switch and a second switch, the second wire is coupled to the ground terminal through the first switch, and the third wire is coupled to the power supply through the second switch.
The further technical solution of this embodiment is that the first switch and the second switch are configured as single pole single throw switches.
Compared with the prior art, the utility model has the following advantages:
According to the utility model, the constant and high-precision detection current is output through the constant current source output circuit, the leakage induction line is detected, whether liquid is leaked or not is judged by detecting the voltage and the current of the leakage induction line, the influence of current fluctuation in the detection process is small, and the leakage alarm can be realized more accurately.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from them without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a high-precision liquid leakage detection apparatus according to the present utility model;
FIG. 2 is an equivalent circuit diagram of the constant current source output circuit of the present utility model;
FIG. 3 is an equivalent circuit diagram of the leakage sensing line without leakage in the present utility model;
FIG. 4 is an equivalent circuit diagram of the leakage sensing wire in the present utility model when leakage occurs;
FIG. 5 is a schematic diagram of wiring of a high-precision liquid leakage detection apparatus according to the present utility model;
the drawing marks are 1-constant current source output circuit, 2-leakage induction line, 21-first wire, 22-second wire, 23-third wire, 24-fourth wire, 3-control center, A1-first voltage, A2-second voltage and A3-third voltage.
Detailed Description
The following description of the embodiments of the present utility model 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 utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 5, the embodiment of the utility model discloses high-precision liquid leakage detection equipment, which comprises a constant current source output circuit 1 for outputting constant current, a liquid leakage induction line 2 and a control unit 3, wherein the liquid leakage induction line 2 comprises a switch unit, a first detection branch and a second detection branch, the first detection branch is coupled with the output end of the constant current source output end circuit 1 and is coupled to a grounding end through the switch unit, a power supply is coupled to the second detection branch through the switch unit and is grounded, and the control unit 3 is coupled with the constant current source output circuit 1, the switch unit, the first detection branch and the second detection branch. The constant current source output circuit 1 can output stable and high-precision constant current to provide detection reference for the leakage induction line, compared with the existing constant voltage source detection circuit which can only judge leakage by using voltage, the constant current source output circuit 1 can judge leakage condition by current, is less influenced by current fluctuation in the detection process, can realize leakage alarm more accurately, and the control center 3 can judge whether leakage condition occurs by sampling and detecting the voltage or current on the induction line 2 at regular time and comparing the voltage or current, so that the selection of the leakage induction line and the control chip can be adjusted according to actual project requirements. The following expands a high-precision liquid leakage detection apparatus proposed by the present embodiment:
As shown in fig. 1, in order to ensure the reliability and stability of the output current of the constant current source output circuit, in this embodiment, the negative feedback principle is adopted to construct the constant current source output circuit, and when the circuit works, the working state of the current control element is dynamically adjusted by monitoring the output current and comparing with the preset reference current, so as to realize constant and high-precision current output. The constant current source output circuit comprises an operational amplifier U1, an operational amplifier U2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a load resistor RL, wherein the inverting input end of the operational amplifier U1 is grounded through the resistor R1 and is coupled to the output end through the resistor R2, the non-inverting input end of the operational amplifier U1 is coupled with a 3.3V power supply through the resistor R3, the output end of the constant current source output circuit is coupled to a first detection branch and the non-inverting input end of the operational amplifier U2 through the load resistor RL, the inverting input end of the operational amplifier U2 is coupled with the output end, and the output end of the operational amplifier U2 is coupled to the non-inverting input end of the operational amplifier U4. For the operational amplifier U1, the voltages of the non-inverting input end and the inverting input end of the operational amplifier U2 are approximately equal according to the principle of virtual short and virtual break due to the existence of negative feedback, the voltage of the non-inverting input end of the operational amplifier U2 is related to the output of the operational amplifier U1 through a load resistor RL, the inverting input end of the operational amplifier U1 is connected with the output end to form the characteristic of a voltage follower, and the equivalent circuit diagram shown in figure 2 is obtained through the above relation and the virtual short and virtual break characteristics of the operational amplifier, and the following formula can be obtained because VOUT is the fed back voltage:
according to the circuit amplification principle, the voltage above the load resistor RL is obtained by the following formula:
V=2*Vin＝3.3v+Vout
The voltage applied to the load resistor RL is constant at V-vout=3.3v, so the output current of the constant current source output circuit is constant.
As shown in fig. 3, the first detection branch includes a first conductive wire 21 and a second conductive wire 22 that are connected, the first conductive wire 21 is coupled to an output end of the constant current source output circuit, the second conductive wire 22 is coupled to a ground end through a switch unit, the second detection branch includes a third conductive wire 23 and a fourth conductive wire 24 that are connected, the third conductive wire 23 is coupled to a power supply through the switch unit, the fourth conductive wire 24 is connected to the ground end, outer skins of the first conductive wire 21 and the third conductive wire 23 are made of insulating and waterproof materials, and outer skins of the second conductive wire 22 and the fourth conductive wire 24 are made of conductive silica gel. Wherein the first wire 21, the second wire 22, the third wire 23 and the fourth wire 24 are adjacently disposed, and when the liquid leaks, the liquid can cover the four wires to be conducted between the second wire 22 and the fourth wire 24;
When no leakage exists, the control center sends out a signal to enable the switch unit to be closed, the control center respectively samples the first voltage A1 and the third voltage A3 to judge whether the voltage exists or not so as to determine whether the cable is broken, and meanwhile, samples the second voltage A2 and the third voltage A3 to calculate the voltage drop of the whole section of cable. Specifically, the cable voltage drop a=a2-A3, the loop current i=a3/R6, so the leakage line segment resistance r=a/I, and the line length l=r/R L is calculated through the line resistivity R L, the line resistivity is determined by the selected positioning water leakage induction line, and different line resistivities are performed according to the selected model.
When leakage occurs, liquid invades the leakage sensing line, the control center is disconnected through the program control switch unit during sampling, only the constant current source supplies power in the whole loop, and the current is constant, but at the moment, the first voltage A1 can be continuously reduced along with the increase of the leakage degree, whether water leakage exists can be judged by sampling the first voltage A1, and the water leakage distance is calculated by combining the voltages of the points A2 and A3.
As shown in fig. 4, the current will not be split on the fourth wire 24, the current will not flow through A2, the voltage at the point A2 is equal to the voltage at the leakage point at the red circle, so the voltage at the points A2 and A3 can be sampled to calculate the whole cable voltage drop, a=a2-A3, the loop current is i=a3/R6, so the leakage line segment resistance is r=a/I, and the leakage position L l eak =r/R l is calculated by the line resistance R l.
When leakage occurs, the loop load increases, the first voltage A1 decreases, and since the leakage liquid has impedance, the more the leakage liquid is, the lower the first voltage A1 is, and depending on such characteristics, different sensitivity ranges can be set.
In order to ensure the detection accuracy, the first detection branch comprises a reference resistor R5, the second wire 22 is coupled to the ground terminal through the resistor R5, the second detection branch comprises a reference resistor R6, the fourth wire 24 is coupled to the ground terminal through the resistor R6, and the accuracy of the resistor R6 is 0.1%. To improve the measurement accuracy of the overall system.
In this embodiment, the switch unit includes a first switch S1 and a second switch S2, the second wire 22 is coupled to the ground through the first switch S1, and the third wire 23 is coupled to the power supply through the second switch S2. Specifically, the first switch S1 and the second switch S2 are configured as single pole single throw switches.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (9)
1. A high-precision liquid leakage detection device is characterized by comprising
A constant current source output circuit for outputting a constant current;
the leakage induction line comprises a switch unit, a first detection branch and a second detection branch, wherein the first detection branch is coupled with the output end of the constant current source output end circuit and is coupled to the ground end through the switch unit;
and the control unit is coupled and connected with the constant current source output circuit, the switch unit, the first detection branch and the second detection branch.
2. The high-precision liquid leakage detection apparatus according to claim 1, wherein the constant current source output circuit includes a negative feedback circuit for detecting a monitor output current.
3. The high-precision liquid leakage detection device according to claim 2, wherein the constant current source output circuit comprises an operational amplifier U1, an operational amplifier U2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a load resistor RL, wherein an inverting input end of the operational amplifier U1 is grounded through the resistor R1 and is coupled to an output end through the resistor R2, a non-inverting input end of the operational amplifier U1 is coupled to a 3.3V power supply through the resistor R3, an output end of the constant current source output circuit is coupled to the non-inverting input end of the operational amplifier U2 through the load resistor RL, and an inverting input end of the operational amplifier U2 is coupled to an output end of the operational amplifier U2 through the resistor R4.
4. The high-precision liquid leakage detection device according to claim 1, wherein the first detection branch comprises a first wire and a second wire which are connected, the first wire is coupled with the output end of the constant current source output circuit, the second wire is coupled with the grounding end through the switch unit, the second detection branch comprises a third wire and a fourth wire which are connected, the third wire is coupled to a power supply through the switch unit, the fourth wire is connected with the grounding end, the outer skins of the first wire and the third wire are made of insulating waterproof materials, and the outer skins of the second wire and the fourth wire are made of conductive silica gel.
5. The high-precision liquid leakage detection apparatus according to claim 4, wherein the first wire, the second wire, the third wire, and the fourth wire are disposed adjacently.
6. The high precision liquid leakage detection apparatus according to claim 4, wherein said first detection branch further comprises a reference resistor R5, said second wire being coupled to ground through said resistor R5.
7. The high precision liquid leakage detection apparatus according to claim 4, wherein said second detection branch further comprises a reference resistor R6, said fourth wire being coupled to ground through said resistor R6 with a precision of 0.1% of said resistor R6.
8. The high-precision liquid leakage detection apparatus according to claim 4, wherein the switching unit comprises a first switch, a second switch, the second wire is coupled to a ground terminal through the first switch, and the third wire is coupled to the power supply through the second switch.
9. The high precision liquid leakage detection apparatus of claim 8, wherein the first switch and the second switch are configured as single pole single throw switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422754992.9U CN223243864U (en) | 2024-11-12 | 2024-11-12 | High-precision liquid leakage detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422754992.9U CN223243864U (en) | 2024-11-12 | 2024-11-12 | High-precision liquid leakage detection equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223243864U true CN223243864U (en) | 2025-08-19 |
Family
ID=96729629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202422754992.9U Active CN223243864U (en) | 2024-11-12 | 2024-11-12 | High-precision liquid leakage detection equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223243864U (en) |
-
2024
- 2024-11-12 CN CN202422754992.9U patent/CN223243864U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2019057148A1 (en) | Power source protection apparatus and terminal using same | |
| CN205404690U (en) | Fault indicator testing arrangement | |
| CN112083309B (en) | Intelligent test system and method for memory plate | |
| CN1584612A (en) | DC power supply system grounded fault detecting method and circuit | |
| CN223243864U (en) | High-precision liquid leakage detection equipment | |
| CN203405561U (en) | DC Power Ground Fault Finder | |
| CN111398729A (en) | An intelligent DC insulation online monitoring device with grounding positioning function | |
| CN207817124U (en) | A kind of electric connector leakage current and insulation resistance measuring device | |
| CN207866954U (en) | Electric cable failure detector | |
| CN110514945A (en) | A multifunctional DC grounding test device and a DC grounding fault detection method | |
| CN207881914U (en) | A kind of fluid seepage detection circuit | |
| CN105182157A (en) | Neutral point multi-point grounding detection device based on high-accuracy detection current | |
| CN119270108A (en) | A battery module and a method for detecting abnormal installation thereof | |
| US20230096780A1 (en) | Detecting circuit and a detecting system of a back-up energy-storing system and related detecting method thereof | |
| CN209088518U (en) | A kind of hardware Over Current Protection System for bidirectional current output | |
| CN210465576U (en) | Multipoint potential equalization testing device | |
| CN114167268B (en) | Circuit breaker characteristic test auxiliary device | |
| CN102944858B (en) | Residual current device action characteristic detector calibration instrument separating switch | |
| CN109916523A (en) | A system and method for monitoring heating faults in switch cabinet cable room | |
| CN214041542U (en) | Constant current circuit for direct current resistance tester | |
| CN111929613B (en) | Same-section bus parasitic loop online monitoring device based on alternating current leakage current sensor | |
| CN210376518U (en) | High-precision contact resistance tester capable of continuously measuring | |
| CN209372858U (en) | A kind of crack integration simplified collection alarm terminal | |
| CN208537614U (en) | Current detection means | |
| CN108549044B (en) | Insulation line selection tester for direct current system of transformer substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |