CN111986447A - Micro-nano temperature sensitive alarm - Google Patents
Micro-nano temperature sensitive alarm Download PDFInfo
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- CN111986447A CN111986447A CN202010777997.7A CN202010777997A CN111986447A CN 111986447 A CN111986447 A CN 111986447A CN 202010777997 A CN202010777997 A CN 202010777997A CN 111986447 A CN111986447 A CN 111986447A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
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Abstract
The invention relates to a micro-nano temperature sensitive alarm which can accurately monitor whether the temperature of a component exceeds a preset threshold value. The purpose of this design is whether temperature in order to accurate monitoring micro-nano device exceeds predetermined threshold to reduce the damage of micro-nano device because of exceeding the damage of the device that predetermined threshold temperature work caused, or cause the reduction of the work efficiency of device. Because the structure is provided with the micro-nano double-layer pipeline, the alarm can be applied to the micro-nano field and has higher precision; because the structure adopts the outer layer tube design of the functional gradient material, the temperature sensitivity is improved, and the designability is greatly enhanced; the structure adopts two modes of inner tube transfusion/non-transfusion, so that the temperature alarm threshold value/cost can be regulated and controlled within a small range.
Description
Technical Field
The invention belongs to the field of micro-nano technology, and relates to a novel micro-nano temperature sensitive alarm. In particular to a method for determining whether a system reaches a preset critical temperature or not by the stability change of a micro-nano fluid transmission pipeline caused by the temperature change and the flow velocity change of fluid in the fluid transmission nano pipeline.
Background
Monitoring of system temperature change is an inevitable research content in the field of micro-nano technology. Such as temperature monitoring of various components of the micro-nano robot, temperature monitoring of a micro-nano chip and temperature monitoring of a liquid cooling device. Most of temperature monitoring devices in the existing documents are applied to macroscopic mechanical equipment such as plants, macroscopic circuit systems, wood structures, gas preparation generators and the like, are not suitable for the field of micro-nano technology, and are difficult to accurately monitor the temperature change of various micro-nano components.
Disclosure of Invention
The technical problem solved by the invention is as follows: in order to solve the problem of temperature monitoring of the micro-nano components, a novel high-precision micro-nano temperature sensitive alarm is designed, and whether the temperature of the monitoring components exceeds a preset threshold value or not can be accurately monitored. The purpose of this design is whether temperature in order to accurate monitoring micro-nano device exceeds predetermined threshold to reduce the damage of micro-nano device because of exceeding the damage of the device that predetermined threshold temperature work caused, or cause the reduction of the work efficiency of device.
The technical scheme of the invention is as follows: a micro-nano temperature sensitive alarm comprises a power supply (2), an indicator light (4) and a tube body assembly, wherein the power supply (2), the indicator light (4) and the tube body assembly form a loop through a wire; the pipe body assembly comprises an inner pipe (6) and an outer pipe (5), the inner pipe (6) and the outer pipe (5) are coaxially arranged, and the outer pipe (5) is sleeved on the inner pipe (6); the inner pipe (6) is internally provided with a cavity body, and the outer pipe and the inner pipe (6) are separated by an insulating material component and are not contacted; when the inner pipe (6) is buckled and deformed because the temperature of the pipe body exceeds the temperature threshold value, the inner pipe and the outer pipe are mutually contacted, at the moment, a power supply, a lead, an indicator lamp and the pipe body assembly form a closed circuit, and the indicator lamp is turned on to give an alarm.
The further technical scheme of the invention is as follows: the device is characterized by further comprising a fluid circulating device (1), wherein the fluid circulating device (1) comprises a motor (4) and a flow pipeline (8), an inner pipe (6) is filled with liquid, two ends of the inner pipe are respectively connected with the motor (4) through the flow pipeline, the inner pipe (6) is connected with an outer pipe (5) (water flow and the flow pipeline of the whole pipeline of the inner pipe are connected, and the pipe wall is connected with a lead wire) to form a loop with a power supply (2) and an indicator lamp (4) through the lead wire; the temperature threshold of the inner tube is adjusted by adjusting the liquid flow speed by changing the rotating speed of the motor (4), so that the micro-nano electronic elements under different working conditions are alarmed; when the inner pipe (6) is buckled and deformed because the temperature of the pipe body exceeds the temperature threshold value, the insulating material component is extruded to enable the inner layer pipe and the outer layer pipe to be contacted with each other, at the moment, the power supply, the lead, the indicating lamp and the pipe body component form a closed circuit, and the indicating lamp is turned on to give an alarm.
The further technical scheme of the invention is as follows: when the fluid circulation device (1) is adopted in the inner pipe (6), a functional gradient pipeline which is made of aluminum elements and ceramics and has the property of changing along the radius is adopted, and the outer part of the inner pipe is made of aluminum materials and the inner part of the inner pipe is made of ceramic materials.
The further technical scheme of the invention is as follows: when the fluid circulating device (1) is not adopted in the inner pipe (6), the inner pipe is made of aluminum element.
The further technical scheme of the invention is as follows: the outer tube (5) is made of an alloy material consisting of nickel (more than 8%), chromium (more than 18%), iron and carbon (0.1%), and the sum of the elements is one hundred percent.
The further technical scheme of the invention is as follows: the assembly temperature of the inner pipe is a preset temperature threshold value-pipeline buckling instability temperature increment, wherein the assembly temperature is the temperature when the inner pipe and the outer pipe are assembled, and the buckling instability temperature increment of the pipeline is obtained by calculation according to the thermodynamic performance of the inner pipeline and the flow rate of fluid in the pipe:
I＝Ai2
wherein σcrThe stress is the instability critical stress of the pipeline, E is the elastic modulus of the inner layer pipeline, I is the principal centroid inertia moment of the inner layer pipeline, mu is the length factor, mu l is the equivalent length, I is the section inertia radius, and A is the section area of the inner layer pipeline.
The further technical scheme of the invention is as follows: the inner wall of the inner tube (6) and the outer wall of the outer tube (5) are respectively connected with a lead to form a positive electrode and a negative electrode and then are connected into a circuit.
The further technical scheme of the invention is as follows: the insulating material member is in clearance fit with the inner wall of the inner pipe (6) and the outer wall of the outer pipe (5).
The further technical scheme of the invention is as follows: the ratio of the length to the diameter of the inner tube is 50: 1, the length of the outer layer pipeline is the same as that of the inner layer pipeline.
The further technical scheme of the invention is as follows: the difference between the radius of the outer pipe and the radius of the inner pipe is 0.1 time of the radius of the inner pipe.
Effects of the invention
The invention has the technical effects that:
1. because the structure is provided with the micro-nano double-layer pipeline, the alarm can be applied to the micro-nano field and has higher precision;
2. because the structure adopts the outer layer tube design of the functional gradient material, the temperature sensitivity is improved, and the designability is greatly enhanced;
3. the structure adopts two modes of inner tube transfusion/non-transfusion, so that the temperature alarm threshold value/cost can be regulated and controlled within a small range.
Drawings
FIG. 1(a) a schematic of the entire circuitry (liquid transport in tube) (b) a schematic of the entire circuitry (liquid not transport in tube)
FIG. 2(a) is a schematic cross-sectional view of the micro-nano infusion tube structure; (b) micro-nano infusion tube structure fluid circulation device schematic diagram
FIG. 3 is a schematic view of a joint portion between an inner tube and an outer tube
1-a fluid circulation device; 2-a power supply; 3, a motor; 4-indicator light; 5, an outer tube; 6, inner tube; 7-insulating material member 8-fluid delivery pipeline 9-wire
Detailed Description
Referring to fig. 1-3, the basic principle of the present invention and its basic structure are described as follows:
the basic principle is as follows:
the basic principle of the design is that whether the temperature components exceed the preset temperature threshold is predicted by using the stability change and the thermal expansion principle of the flow transmission pipeline. The main parts of the design are composed of 5 parts, namely an inner layer flow transmission pipeline, an outer layer pipe, a fluid circulation device, a power supply and an indicator light. Because the micro-nano pipelines made of different materials can have different critical temperatures under different flow rates, when the temperature is exceeded, the micro-nano flow transmission pipes fixedly supported at two sections of simple supports and two ends can generate static buckling instability, so that the inner pipe and the outer pipe can be contacted due to the deformation of the inner pipe under the condition, and the power supply of the indicator lamp is switched on to start working. The precise temperature predetermined threshold may be computationally determined by adjustment of the assembly temperature and adjustment of the fluid flow rate.
The basic structure is as follows:
the novel high-precision micro-nano temperature sensitive alarm designed by the paper can be divided into two types. Type 1: the inner tube conveys liquid. It is composed of 5 parts of inner layer flow pipeline, outer layer pipe, fluid circulation device, power supply and indicator light. Type 2: no liquid needs to be transported in the inner pipe. It is composed of 4 parts of inner layer flow pipeline, outer layer pipe, power supply and indicator light. The temperature measuring instrument is characterized in that the temperature measuring instrument integrally represents a circuit comprising a power supply, an indicator light and a temperature measuring instrument, wherein the temperature measuring instrument comprises an inner layer pipeline, an outer layer pipeline and a fluid circulating device. The inner and outer layer pipelines are connected through insulating materials; the fluid circulating device is formed by connecting a motor with an inner pipe through a fluid transmission pipeline and connecting a temperature meter with the inner pipe and the outer pipe respectively through leads to be connected into a circuit. The required material characteristics of each part are as follows:
(1) inner layer fluid transmission pipeline. The inner layer pipe is made of material with large thermal expansion coefficient, moderate rigidity and good conductivity (the more ideal material is aluminum, and the pipe can also be made of functional gradient material according to different requirements, such as AL and AL2O3Prepared as a functionally graded material tube), whose schematic view is as number 1 in fig. 2 (a).
(2) An outer tube. The material with small thermal expansion coefficient, moderate rigidity and conductivity is selected to be manufactured (the more ideal material is an alloy material composed of nickel, iron and carbon elements, such as invar with extremely low thermal expansion coefficient), and the schematic diagram is shown as number 2 in fig. 2 (a).
(3) And a fluid circulation device. In order to accurately adjust the critical temperature of the temperature sensitive alarm, a circulating device capable of adjusting the flow rate of fluid in the inner pipe is required to be additionally arranged on the outer part. The schematic diagram is shown in fig. 2(b), and the position in the circuit is shown as number 1 in fig. 1.
(4) Power, wire and pilot lamp.
The working principle of the novel high-precision micro-nano temperature sensitive alarm is that the inner layer tube is buckled and deformed, the inner layer tube and the outer layer tube are mutually contacted, at this time, a power supply, a lead, an indicator lamp, the inner layer tube and the outer layer tube form a closed circuit, and the indicator lamp is lightened. As shown in fig. 1.
The design and manufacturing idea of each part of the novel high-precision micro-nano temperature sensitive alarm is described below with reference to the accompanying drawings.
Example 1
(1) Type 1: the inner layer pipeline is not filled with liquid, and the system does not contain a fluid circulating device. The inner pipe is made of aluminum (because aluminum has a large thermal expansion coefficient, the pipe made of aluminum is more sensitive to temperature change). And the inner-layer pipeline made of other composite materials with larger thermal expansion coefficient and better conductivity can also be adopted according to the specific working environment. The outer layer pipeline is made of an alloy material consisting of nickel (more than 8%), chromium (more than 18%), iron and carbon (0.1%), wherein the mass of the alloy material is one hundred percent. And the exclusive material-conforming external pipeline can be manufactured according to different working environments. The ratio of the length to the diameter of the inner tube is 50: 1, the length of the outer layer pipeline is the same as that of the inner layer pipeline. The difference between the radius of the outer layer pipeline and the radius of the inner layer pipeline is 0.1 time of the radius of the inner layer pipeline. The assembly temperature of the inner-layer pipe and the outer-layer pipe needs to be calculated in advance, the assembly temperature is a preset temperature threshold value-pipeline buckling instability temperature increment (the buckling instability temperature increment of the pipeline can be calculated according to the thermodynamic performance of the inner pipeline), and the temperature threshold value cannot be adjusted after assembly. The schematic diagram is shown in fig. 2 (a).
(2) The inner layer pipe and the outer layer pipe are connected. The inner and outer connecting parts are made of ceramic materials (or other non-conductive materials) of insulating materials. The connection between the inner and outer pipes must be ensured to be firm, and the connection between the inner and outer pipes must be ensured to be fixed. The schematic diagram is shown as numeral 7 in fig. 3.
(3) Closed circuit of the whole system. The schematic diagram of the whole system composed of the number 6 in the figure 1 of the inner layer pipe, the number 5 in the figure 1 of the outer layer pipe, the number 9 in the figure 1 of the conducting wire, the number 2 in the figure 1 of the power supply and the number 4 in the figure 1 of the indicator light is shown in figure 1, wherein (a) is the schematic diagram of the pipeline for conveying liquid, and (b) is the schematic diagram when the pipeline does not convey liquid.
Example 2
(1) Type 2: the inner layer nanotube is filled with liquid, and the system comprises a fluid circulating device. The inner tube adopts a functional gradient pipeline which is made of aluminum elements and ceramics and has the property of changing along the radius, the outer material of the inner tube is aluminum inner material which is ceramic (the thermal expansion coefficient of aluminum is larger and is more sensitive to temperature change, and the inner part of the inner tube is ceramic and can play a certain heat insulation role, so that the temperature influence of the temperature of fluid in the tube on the temperature of the inner tube is minimized). And the inner-layer pipeline made of other composite materials with larger thermal expansion coefficient and better conductivity can also be adopted according to the specific working environment. The outer pipe is made of alloy material (with small thermal expansion coefficient, moderate rigidity and conductivity) composed of nickel (more than 8%), chromium (more than 18%), iron and carbon (0.1%). And the exclusive material-conforming external pipeline can be manufactured according to different working environments. The ratio of the length to the diameter of the inner tube is 50: 1, the length of the outer layer pipeline is the same as that of the inner layer pipeline. The difference between the radius of the outer layer pipeline and the radius of the inner layer pipeline is 0.1 time of the radius of the inner layer pipeline.
The assembly temperature of the inner layer pipe and the outer layer pipe needs to be calculated in advance, the assembly temperature is a preset temperature threshold value-pipeline buckling instability temperature increment, and the buckling instability temperature increment of the pipeline can be obtained by calculation according to the thermodynamic performance of the inner pipeline and the flow rate of fluid in the pipeline:
I＝Ai2
wherein σcrThe instability critical stress of the pipeline is shown as E, the elastic modulus of the inner layer pipeline is shown as I, the main centroid inertia moment of the inner layer pipeline is shown as I, mu is a length factor, mu l is a considerable length, I is a section inertia radius, and A is a section area.
And σcrAnd the buckling instability temperature increment of the pipeline can be obtained by relating the temperature gradient and the fluid pressure. That is, the final σ is foundcrWherein I is according to I ═ Ai2And (4) obtaining. I is a known amount.
The predetermined temperature threshold after assembly can be adjusted by adjusting the flow rate of the liquid in the tube. The schematic diagram is shown in fig. 2 (a).
It should be noted that the threshold is adjusted before operation, so that the alarm is made to meet the corresponding operating conditions. When liquid exists, the threshold value can be changed after the manufacturing, namely the method is suitable for judging various working conditions, if the temperature of a certain type of micro-nano electronic element can be monitored and alarmed in real time, and then the temperature threshold value is changed by adjusting the flow velocity of the fluid, so that the temperature can continue to be early-warned for another type of micro-nano chip.
(2) The inner layer pipe and the outer layer pipe are connected. The inner and outer connecting parts are made of ceramic materials (or other non-conductive materials) of insulating materials. The connection between the inner and outer pipes must be ensured to be firm, and the connection part must ensure that the connection between the inner and outer pipes is fixed. The schematic diagram is shown as number 1 in fig. 3.
(3) And a liquid circulating device. In order to adjust the flow rate of the liquid in the inner layer pipeline, a liquid circulating device with adjustable power is additionally arranged. Thus, after the inner pipe and the outer pipe are assembled, the temperature threshold value can be adjusted by adjusting the flow rate of fluid in the pipes. The schematic diagram is shown in fig. 2 (b).
(4) Closed circuit of the whole system. The schematic diagram of the whole system composed of the inner tube, the outer tube, the conducting wire, the power supply and the indicator light is shown in figure 1.
Claims (10)
1. A micro-nano temperature sensitive alarm is characterized by comprising a power supply (2), an indicator light (4) and a tube body assembly, wherein the power supply (2), the indicator light (4) and the tube body assembly form a loop through a wire; the pipe body assembly comprises an inner pipe (6) and an outer pipe (5), the inner pipe (6) and the outer pipe (5) are coaxially arranged, and the outer pipe (5) is sleeved on the inner pipe (6); the inner pipe (6) is internally provided with a cavity body, and the outer pipe and the inner pipe (6) are separated by an insulating material component and are not contacted; when the inner pipe (6) is buckled and deformed because the temperature of the pipe body exceeds the temperature threshold value, the inner pipe and the outer pipe are mutually contacted, at the moment, a power supply, a lead, an indicator lamp and the pipe body assembly form a closed circuit, and the indicator lamp is turned on to give an alarm.
2. The micro-nano temperature sensitive alarm device according to claim 1, further comprising a fluid circulation device (1), wherein the fluid circulation device (1) comprises a motor (4) and a flow transmission pipeline (8), the inner tube (6) is filled with liquid, two ends of the inner tube are respectively connected with the motor (4) through the flow transmission pipeline, the inner tube (6) and the outer tube (5) (the water flow and the flow transmission pipeline of the whole pipeline of the inner tube are connected, and the tube wall and the lead are connected.) form a loop with the power supply (2) and the indicator light (4) through leads; the temperature threshold of the inner tube is adjusted by adjusting the liquid flow speed by changing the rotating speed of the motor (4), so that the micro-nano electronic elements under different working conditions are alarmed; when the inner pipe (6) is buckled and deformed because the temperature of the pipe body exceeds the temperature threshold value, the insulating material component is extruded to enable the inner layer pipe and the outer layer pipe to be contacted with each other, at the moment, the power supply, the lead, the indicating lamp and the pipe body component form a closed circuit, and the indicating lamp is turned on to give an alarm.
3. The micro-nano temperature-sensitive alarm of claim 1 or 2, wherein the inner tube (6) is a functionally graded tube made of aluminum and ceramic with properties varying along a radius when the fluid circulation device (1) is used, and the outer part of the inner tube is made of aluminum and the inner part is made of ceramic material.
4. The micro-nano temperature-sensitive alarm device of claim 1 or 2, wherein the inner tube (6) is made of aluminum when the fluid circulation device (1) is not adopted.
5. The micro-nano temperature-sensitive alarm device according to claim 1, wherein the outer tube (5) is made of an alloy material consisting of nickel (> 8%), chromium (> 18%), iron, and carbon (0.1%), wherein the total mass of the elements is one hundred percent.
6. The micro-nano temperature-sensitive alarm device of claim 1, wherein the assembly temperature of the inner pipe is a predetermined temperature threshold value-the buckling instability temperature increment of the pipe, wherein the assembly temperature is the temperature when the inner pipe and the outer pipe are assembled, and the buckling instability temperature increment of the pipe is calculated according to the thermodynamic property of the inner pipe and the flow rate of the fluid in the pipe:
I＝Ai2
wherein σcrThe stress is the instability critical stress of the pipeline, E is the elastic modulus of the inner layer pipeline, I is the principal centroid inertia moment of the inner layer pipeline, mu is the length factor, mu l is the equivalent length, I is the section inertia radius, and A is the section area of the inner layer pipeline.
7. The micro-nano temperature-sensitive alarm device according to claim 1, wherein the inner wall of the inner tube (6) and the outer wall of the outer tube (5) are respectively connected with a lead to form a positive electrode and a negative electrode and then are connected into a circuit.
8. The micro-nano temperature-sensitive alarm device of claim 1, wherein the insulating material member is in clearance fit with the inner wall of the inner tube (6) and the outer wall of the outer tube (5).
9. The micro-nano temperature-sensitive alarm of claim 1, wherein the ratio of the length to the diameter of the inner tube is 50: 1, the length of the outer layer pipeline is the same as that of the inner layer pipeline.
10. The micro-nano temperature-sensitive alarm device of claim 1, wherein the difference between the radius of the outer tube and the radius of the inner tube is 0.1 times the radius of the inner tube.
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Cited By (1)
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