CN106404109B - Heat conduction temperature induction type liquid level switch - Google Patents
Heat conduction temperature induction type liquid level switch Download PDFInfo
- Publication number
- CN106404109B CN106404109B CN201611112381.8A CN201611112381A CN106404109B CN 106404109 B CN106404109 B CN 106404109B CN 201611112381 A CN201611112381 A CN 201611112381A CN 106404109 B CN106404109 B CN 106404109B
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- temperature sensing
- sensing assembly
- temperature
- processing unit
- heat conduction
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- 239000007788 liquid Substances 0.000 title claims abstract description 60
- 230000006698 induction Effects 0.000 title claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 85
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 230000005284 excitation Effects 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims description 72
- 239000011241 protective layer Substances 0.000 claims description 23
- 238000009413 insulation Methods 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
Abstract
The invention provides a heat conduction temperature induction type liquid level switch, which is characterized in that: the device at least comprises a heating temperature sensing assembly, a heating excitation unit, a signal detection processing unit and a power module; the heating temperature sensing assembly and the temperature sensing assembly are both in direct contact with an external measured medium, the heating excitation unit is electrically connected with the heating temperature sensing assembly, and meanwhile, the heating temperature sensing assembly and the temperature sensing assembly are respectively electrically connected with the signal detection processing unit so as to complete signal detection, signal processing and signal alarming; the power supply module supplies power to the heating excitation unit and the signal detection processing unit. The invention has the characteristics of simple structure, small volume, no movable parts, good shock resistance, convenient installation, low cost and the like.
Description
Technical Field
The invention relates to the technical field of liquid level measurement, in particular to a heat conduction temperature induction type liquid level switch.
Background
The common liquid level switch types at present are in various forms such as a float type, a photoelectric type, a microwave type and the like. The floating ball type liquid level switch has wide application and is divided into a purely mechanical type float liquid level switch and a magnetic float type liquid level switch. The purely mechanical float type liquid level switch uses the float to move up and down along with the lifting of the liquid level, and generally adopts the lever principle to open or close the contact so as to achieve the purpose of automatic control. But the structure is complex, the volume is larger, the shock resistance is poor, the installation is difficult, and the cost is higher. The magnetic float type liquid level switch is to use the magnetic field generated by the float with permanent magnet steel and the magnetic induction element to make the magnetic float change with the lifting of the liquid level, and the change of the magnetic float position causes the change of the electric parameter of the magnetic induction device to detect the liquid level. However, the liquid level switch is also complicated in mechanism, large in size and inconvenient to install, and the magnetic steel cannot be used under the high-temperature medium condition due to demagnetization at high temperature. The photoelectric liquid level switch utilizes the refraction and reflection principle of light, when the liquid submerges and does not submerge the liquid level switch, the proportion of the light rays which are refracted out is different, the emitted light intensity is also different, so that the liquid level is detected, but the conical optical prism of the liquid level switch is easy to wear and damage, and the liquid level switch is easy to alarm by mistake in the environments of oil gas, water vapor and the like, and the operation is unreliable. The microwave type is realized by adopting a microwave transmitting and receiving correlation mode, is easily influenced by reflection of space barriers and the like, has severe requirements on environment and has higher cost.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a heat conduction temperature induction type liquid level switch which has the characteristics of simple structure, no movable part, high shock resistance, small volume, high reliability and the like; and the device can be reliably used in high and low temperature mediums, is convenient to install and low in cost, and has low requirements on environment.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a heat conduction temperature induction type liquid level switch is characterized in that: the device at least comprises a heating temperature sensing assembly, a heating excitation unit, a signal detection processing unit and a power module; the heating temperature sensing assembly and the temperature sensing assembly are both in direct contact with an external measured medium, the heating excitation unit is electrically connected with the heating temperature sensing assembly, and meanwhile, the heating temperature sensing assembly and the temperature sensing assembly are respectively electrically connected with the signal detection processing unit so as to complete signal detection, signal processing and signal alarming; the power supply module supplies power to the heating excitation unit and the signal detection processing unit.
A heat conduction temperature sensing type liquid level switch, further comprising a shell; the heating temperature sensing assembly, the heating excitation unit, the signal detection processing unit and the power module are all arranged in the shell, the heating temperature sensing assembly and the temperature sensing assembly are arranged on the wall of the shell at the liquid level alarm line at the lower end of the shell, and one end surfaces of the heating temperature sensing assembly and the temperature sensing assembly are exposed out of the wall of the shell; the heating excitation unit and the signal detection processing unit are respectively and electrically connected with the power supply module.
The heating temperature sensing assembly is composed of a first heat conduction protective layer, a first heat conduction layer, a heating element, a second heat conduction layer, a first temperature sensor and a first heat insulation layer, wherein the first heat insulation layer is a heat insulation sleeve with one end open, the first heat conduction protective layer, the first heat conduction layer, the heating element, the second heat conduction layer and the first temperature sensor are sequentially and tightly attached to each other in sequence and are arranged in the first heat insulation layer, the first heat conduction protective layer is located at the opening end of the first heat insulation layer, and the end face of the first heat conduction protective layer is exposed out of the shell wall.
The temperature sensing assembly is composed of a second heat conduction protection layer, a third heat conduction layer, a second temperature sensor and a second heat insulation layer, wherein the second heat insulation layer is a heat insulation sleeve with one end open, the second heat conduction protection layer, the third heat conduction layer and the second temperature sensor are sequentially and tightly attached to each other in the second heat insulation layer, the second heat conduction protection layer is located at the open end of the second heat insulation layer, and the end face of the second heat conduction protection layer is exposed out of the shell wall.
The signal detection processing unit includes: the system comprises a first sensor processing unit, a second sensor processing unit, a temperature comparison processing unit and an alarm output unit; the input ends of the first sensor processing unit and the second sensor processing unit are respectively and electrically connected with the heating temperature sensing assembly and the temperature sensing assembly; the output ends of the first sensor processing unit and the second sensor processing unit are respectively and electrically connected with two input ends of the temperature comparison processing unit, and the output end of the temperature comparison processing unit is connected with the input end of the alarm output unit; the output end of the alarm output unit is connected with an input/output cable.
The input/output cable is provided with an output interface and an input interface; one end of the input interface is communicated with an external power supply, and the other end of the input interface is electrically connected with the power supply module through an input lead of an input/output cable; one end of the output interface is electrically connected with the controlled equipment, and the other end of the output interface is electrically connected with the output end of the alarm output unit through an output lead of the input/output cable.
The first heat conduction protective layer and the second heat conduction protective layer have the same or similar characteristics and have similar heat exchange capacity with the outside.
The temperature comparison processing unit processes the temperature difference between the heating temperature sensing component and the temperature sensing component to judge whether the liquid level alarms.
The first temperature sensor and the second temperature sensor are thermal resistors, thermocouples, diode type temperature sensors or integrated temperature sensors.
The invention has the beneficial effects that:
the heating temperature sensing component and the temperature sensing component of the heat conduction temperature sensing type liquid level switch provided by the invention are in contact with an external measured medium, the heating excitation unit is connected with the heating temperature sensing component and excites the heating temperature sensing component to heat, and the heating temperature sensing component and the temperature sensing component exchange heat with the periphery of the heating temperature sensing component mainly through the first heat conduction protective layer and the second heat conduction protective layer. When the liquid level switch does not contact the liquid medium, the liquid level switch contacts the external medium, and is an air gas phase medium, because the liquid level switch has poor heat conductivity, the heating temperature sensing component is obviously higher than the ambient temperature, and the temperature sensing component is close to the ambient temperature, and the temperature difference value of the heating temperature sensing component and the temperature sensing component is larger. When the liquid level switch contacts the liquid medium, the heat conductivity and heat exchange property of the fluid are obviously higher than those of the gas-phase medium such as air, so that the temperatures of the heating temperature sensing assembly and the temperature sensing assembly are quickly balanced with the medium temperature and are close to the medium temperature, and the temperature difference of the two assemblies is smaller. And judging whether the liquid level alarms or not by judging the temperature difference value of the two components. The heating temperature sensing component and the temperature sensing component are respectively and electrically connected with the signal detection processing unit to finish the detection, the processing and the alarm of the signal.
The heat conduction temperature sensing type liquid level switch provided by the invention has the advantages of small volume, no movable part, convenience in mounting on the tank wall or the top of a liquid container and high reliability. And can be reliably used in high and low temperature medium.
The present invention will now be described in detail with reference to the drawings and examples so that the advantages and features of the present invention will be more readily understood by those skilled in the art, but are not limited thereto.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a heat-generating temperature sensing assembly according to the present invention;
FIG. 3 is a schematic diagram of a temperature sensing assembly according to the present invention;
in the figure, 1, a heating temperature sensing assembly; 2. a temperature sensing assembly; 3. a heat-generating excitation unit; 4. a signal detection processing unit; 5. a first sensor processing unit; 6. a second sensor processing unit; 7. a temperature comparison processing unit; 8. an alarm output unit; 9. a first thermally conductive protective layer; 10. a first heat conductive layer; 11. a heating element; 12. a second heat conductive layer; 13. a first temperature sensor; 14. a first insulating layer; 15. a second thermally conductive protective layer; 16. a third heat conductive layer; 17. a second temperature sensor; 18. a second insulating layer; 19. a housing; 20. an input/output cable; 21. an output interface; 22. an input interface; 23. a power module; 24. and a liquid level alarm line.
Detailed Description
Example 1
The heat conduction temperature induction type liquid level switch at least comprises a heating temperature sensing component 1, a temperature sensing component 2, a heating excitation unit 3, a signal detection processing unit 4 and a power supply module 23; the heating temperature sensing assembly 1 and the temperature sensing assembly 2 are in direct contact with an external medium to be measured, the heating excitation unit 3 is electrically connected with the heating temperature sensing assembly 1, and meanwhile, the heating temperature sensing assembly 1 and the temperature sensing assembly 2 are respectively electrically connected with the signal detection processing unit 4 so as to complete signal detection, signal processing and signal alarming; the power supply module 23 supplies power to the heat generation exciting unit 3 and the signal detection processing unit 4.
Example 2
As shown in fig. 1, a heat conduction temperature sensing type liquid level switch comprises a heating temperature sensing component 1, a temperature sensing component 2, a heating excitation unit 3, a signal detection processing unit 4, a power supply module 23 and a shell 19; the heating temperature sensing assembly 1, the temperature sensing assembly 2, the heating excitation unit 3, the signal detection processing unit 4 and the power module 23 are all arranged in the shell 19; the heating temperature sensing assembly 1 and the temperature sensing assembly 2 are arranged on the wall of the shell at the position of a liquid level alarm line 24 at the lower end of the shell 19, so that the heating temperature sensing assembly 1 and the temperature sensing assembly 2 are in direct contact with an external measured medium, one end surfaces of the heating temperature sensing assembly 1 and the temperature sensing assembly 2 are exposed out of the wall of the shell, the heating excitation unit 3 is electrically connected with the heating temperature sensing assembly 1, and the heating temperature sensing assembly 1 and the temperature sensing assembly 2 are respectively electrically connected with the signal detection processing unit 4; the heat generation exciting unit 3 and the signal detection processing unit 4 are electrically connected to the power supply module 23, respectively.
As shown in fig. 2, the heating temperature sensing assembly 1 is composed of a first heat conducting protection layer 9, a first heat conducting layer 10, a heating element 11, a second heat conducting layer 12, a first temperature sensor 13 and a first heat insulating layer 14, wherein the first heat insulating layer is a heat insulating sleeve with one end open, the first heat conducting protection layer 9, the first heat conducting layer 10, the heating element 11, the second heat conducting layer 12 and the first temperature sensor 13 are sequentially and tightly attached to each other in the first heat insulating layer 14, the first heat conducting protection layer 9 is located at the open end of the first heat insulating layer 14, and the end face of the first heat conducting protection layer 9 is exposed outside the shell wall.
As shown in fig. 3, the temperature sensing assembly 2 is composed of a second heat conducting protection layer 15, a third heat conducting layer 16, a second temperature sensor 17 and a second heat insulating layer 18, the second heat insulating layer 18 is a heat insulating sleeve with one end open, the second heat conducting protection layer 15, the third heat conducting layer 16 and the second temperature sensor 17 are sequentially and tightly attached to each other in the second heat insulating layer 18, wherein the second heat conducting protection layer 15 is located at the open end of the second heat insulating layer 18, and the end face of the second heat conducting protection layer 15 is exposed outside the shell wall.
As shown in fig. 1, the signal detection processing unit 4 includes: a first sensor processing unit 5, a second sensor processing unit 6, a temperature comparison processing unit 7 and an alarm output unit 8; the input ends of the first sensor processing unit 5 and the second sensor processing unit 6 are respectively electrically connected with the heating temperature sensing assembly 1 and the temperature sensing assembly 2; the output ends of the first sensor processing unit 5 and the second sensor processing unit 6 are respectively and electrically connected with two input ends of the temperature comparison processing unit 7, and the output end of the temperature comparison processing unit 7 is connected with the input end of the alarm output unit 8; the output end of the alarm output unit 8 is connected with an input/output cable 20.
The input/output cable 20 is provided with an output interface 21 and an input interface 22; one end of the input interface 22 is communicated with an external power supply, and the other end of the input interface is electrically connected with the power module 23 through an input lead of the input/output cable 20; one end of the output interface 21 is electrically connected with the controlled equipment, and the other end is electrically connected with the output end of the alarm output unit 8 through an output lead of the input/output cable 20.
The first heat conducting protective layer 9 and the second heat conducting protective layer 15 have the same or similar characteristics and have similar heat exchange capacity with the outside.
The invention relates to a heat conduction temperature induction type liquid level switch, which judges whether a liquid level alarms or not by processing the temperature difference between a heating temperature sensing component 1 and a temperature sensing component 2 through a temperature comparison processing unit 7.
The heating temperature sensing assembly 1 and the temperature sensing assembly 2 are arranged at the liquid level alarm limit, the volumes of the two assemblies are smaller during manufacturing, the surface area of the heat conducting protective layer is smaller, the heat can be balanced conveniently, and the first heat conducting protective layer and the second heat conducting protective layer are exposed on the surface of the liquid level switch and are in direct contact with a measured medium. The temperature sensing component is in heat transfer through the second heat conducting protective layer, and the temperature of the second temperature sensor is the same as the temperature of surrounding medium (such as air or liquid); the heating element of the heating temperature sensing assembly adopts an electric heating device, the heating element is realized in a resistance mode in the example, the resistance is electrified to generate heat, the heating element generates heat under the action of the heating excitation source unit, and the heating excitation source unit 3 can be a voltage source or a current source. The heating heat of the heating element 11 is simultaneously transferred to the first temperature sensor 13 and the first heat conducting protective layer 9, after the temperature is balanced, the temperature of the first temperature sensor 13 is air when the surrounding medium is not in alarm, and the temperature is higher than the temperature of the air, namely the temperature of the second temperature sensor 17; when the contact liquid medium reaches the alarm, the temperatures of the first temperature sensor 13 and the second temperature sensor 17 are close due to the difference of the heat conductivity and the heat exchange performance of the air and the liquid medium, so that whether the liquid level alarms can be accurately judged. The signal detection processing unit 4 mainly amplifies, converts, detects and compares the electric signals of the front-end temperature sensor, thereby achieving the purposes of alarm judgment and output.
In this embodiment, the first and second heat-conducting protection layers are metal bodies, and the first, second and third heat-conducting layers are made of heat-conducting glue, so that the first and second heat-conducting protection layers can meet the requirement of more liquid media by transferring heat between the heat-conducting glue and the heating element, but the heat-conducting protection layers are not limited to the above, and the heat-conducting protection layers with certain protection function can be directly adopted to meet the requirement of low cost suitable for specific liquid media.
The first heat insulating layer and the second heat insulating layer in this example are used to prevent the heat exchange between the heating temperature sensing component 1 and the temperature sensing component 2 and the outside except for the heat conducting protection layer, if the shell itself has a better heat resisting effect, the heat insulating layer does not need to be specially arranged, and can be used as the shell or the air gap.
The first temperature sensor and the second temperature sensor in the embodiment adopt thermal resistance sensors to sense temperature change, and are electrically connected with a first sensor processing unit and a second sensor processing unit to form a processing circuit of thermal resistance signals; when the first temperature sensor and the second temperature sensor adopt thermocouple sensors, the corresponding first sensor processing unit and the second sensor processing unit are changed into processing circuits of thermocouples; when the first and second temperature sensors are integrated sensors or digital temperature sensors, the first sensor processing unit and the second sensor processing unit are not needed, and the temperature output can be directly processed by the temperature comparison processing unit 7.
The temperature comparison processing unit 7 is a processing circuit for performing a difference and comparison operation on the output signals of the first and second sensor processing units corresponding to the temperatures of the first and second temperature sensors, or a processor having the function.
The alarm output unit 8 is an alarm output device or signal with sound, light and electricity output.
The processing circuit of the thermal resistor and the processing circuit of the thermocouple are both prior art and will not be described in detail here.
The heat conduction temperature induction type liquid level switch provided by the invention has the advantages of small volume, no movable parts, good shock resistance, convenience in installation on the tank wall or the top of a liquid container and high reliability. And can be reliably used in high and low temperature medium.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but is to be accorded the full scope of the invention as defined by the appended claims.
The non-illustrated portions of the present invention are the same as or are implemented by the prior art and are not described here.
Claims (7)
1. A heat conduction temperature induction type liquid level switch is characterized in that: the device at least comprises a heating temperature sensing assembly (1), a temperature sensing assembly (2), a heating excitation unit (3), a signal detection processing unit (4) and a power supply module (23); the heating temperature sensing assembly (1) and the temperature sensing assembly (2) are in direct contact with an external measured medium, the heating excitation unit (3) is electrically connected with the heating temperature sensing assembly (1), and meanwhile, the heating temperature sensing assembly (1) and the temperature sensing assembly (2) are respectively electrically connected with the signal detection processing unit (4) so as to finish signal detection, signal processing and signal alarming; the power supply module (23) supplies power to the heating excitation unit (3) and the signal detection processing unit (4); the heating temperature sensing assembly (1) is composed of a first heat conduction protective layer (9), a first heat conduction layer (10), a heating element (11), a second heat conduction layer (12), a first temperature sensor (13) and a first heat insulation layer (14), wherein the first heat insulation layer is a heat insulation sleeve with one end open, the first heat conduction protective layer (9), the first heat conduction layer (10), the heating element (11), the second heat conduction layer (12) and the first temperature sensor (13) are sequentially and tightly attached to be arranged in the first heat insulation layer (14), the first heat conduction protective layer (9) is positioned at the opening end of the first heat insulation layer (14), and the end face of the first heat conduction protective layer (9) is exposed outside the shell wall; the temperature sensing assembly (2) is composed of a second heat conduction protection layer (15), a third heat conduction layer (16), a second temperature sensor (17) and a second heat insulation layer (18), wherein the second heat insulation layer (18) is a heat insulation sleeve with one end open, the second heat conduction protection layer (15), the third heat conduction layer (16) and the second temperature sensor (17) are sequentially and tightly attached to each other in the second heat insulation layer (18), the second heat conduction protection layer (15) is located at the opening end of the second heat insulation layer (18), and the end face of the second heat conduction protection layer (15) is exposed out of the shell wall.
2. A thermally conductive temperature-sensitive liquid level switch as claimed in claim 1 wherein: also comprises a shell (19); the heating temperature sensing assembly (1), the temperature sensing assembly (2), the heating excitation unit (3), the signal detection processing unit (4) and the power module (23) are all arranged in the shell (19), the heating temperature sensing assembly (1) and the temperature sensing assembly (2) are arranged on the shell wall at the position of a liquid level alarm line (24) at the lower end of the shell (19), and one end surfaces of the heating temperature sensing assembly (1) and the temperature sensing assembly (2) are exposed out of the shell wall; the heating excitation unit (3) and the signal detection processing unit (4) are respectively and electrically connected with the power supply module (23).
3. A thermally conductive temperature-sensitive liquid level switch as claimed in claim 1 or 2 wherein: the signal detection processing unit (4) comprises: the device comprises a first sensor processing unit (5), a second sensor processing unit (6), a temperature comparison processing unit (7) and an alarm output unit (8); the input ends of the first sensor processing unit (5) and the second sensor processing unit (6) are respectively and electrically connected with the heating temperature sensing assembly (1) and the temperature sensing assembly (2); the output ends of the first sensor processing unit (5) and the second sensor processing unit (6) are respectively and electrically connected with two input ends of the temperature comparison processing unit (7), and the output end of the temperature comparison processing unit (7) is connected with the input end of the alarm output unit (8); the output end of the alarm output unit (8) is connected with an input/output cable (20).
4. A thermally conductive temperature-sensitive fluid level switch as defined in claim 3 wherein: the input/output cable (20) is provided with an output interface (21) and an input interface (22); one end of the input interface (22) is communicated with an external power supply, and the other end of the input interface is electrically connected with the power supply module (23) through an input lead of the input/output cable (20); one end of the output interface (21) is electrically connected with the controlled equipment, and the other end of the output interface is electrically connected with the output end of the alarm output unit (8) through an output lead of the input/output cable (20).
5. A thermally conductive temperature-sensitive liquid level switch as claimed in claim 1 wherein: the first heat conduction protective layer (9) and the second heat conduction protective layer (15) have the same or similar characteristics and have similar heat exchange capacity with the outside.
6. A thermally conductive temperature-sensitive liquid level switch as claimed in claim 1 wherein: the temperature difference between the heating temperature sensing component (1) and the temperature sensing component (2) is processed by the temperature comparison processing unit (7) to judge whether the liquid level alarms.
7. A thermally conductive temperature-sensitive liquid level switch as claimed in claim 1 wherein: the first temperature sensor (13) and the second temperature sensor (17) are thermal resistors, thermocouples, diode type temperature sensors or integrated temperature sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611112381.8A CN106404109B (en) | 2016-12-07 | 2016-12-07 | Heat conduction temperature induction type liquid level switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611112381.8A CN106404109B (en) | 2016-12-07 | 2016-12-07 | Heat conduction temperature induction type liquid level switch |
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| CN106404109A CN106404109A (en) | 2017-02-15 |
| CN106404109B true CN106404109B (en) | 2024-03-08 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030479A (en) * | 1987-06-05 | 1989-01-18 | 西屋电气公司 | Be the temperature sensor of the existence that detects water and the instrument system that constitutes by it |
| CN2769860Y (en) * | 2005-01-26 | 2006-04-05 | 汪南杰 | Liquid-level measuring device |
| CN1800792A (en) * | 2005-05-26 | 2006-07-12 | 郭豫生 | Heat conduction sensor and measuring method thereof |
| CN101556179A (en) * | 2009-03-12 | 2009-10-14 | 瞿瑛 | Self-heating heat responsive element and liquid level detector assembled thereby |
| CN102435257A (en) * | 2011-09-30 | 2012-05-02 | 广东天际电器股份有限公司 | Liquid level sensor and liquid level detection method thereof |
| CN206311169U (en) * | 2016-12-07 | 2017-07-07 | 陈飞帆 | A kind of heat transfer temperature induction type liquid-level switch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6536276B2 (en) * | 2001-02-27 | 2003-03-25 | Rosemont Aerospace Inc. | Apparatus and method to non-intrusively measure the level of liquid in a sealed container |
-
2016
- 2016-12-07 CN CN201611112381.8A patent/CN106404109B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030479A (en) * | 1987-06-05 | 1989-01-18 | 西屋电气公司 | Be the temperature sensor of the existence that detects water and the instrument system that constitutes by it |
| CN2769860Y (en) * | 2005-01-26 | 2006-04-05 | 汪南杰 | Liquid-level measuring device |
| CN1800792A (en) * | 2005-05-26 | 2006-07-12 | 郭豫生 | Heat conduction sensor and measuring method thereof |
| CN101556179A (en) * | 2009-03-12 | 2009-10-14 | 瞿瑛 | Self-heating heat responsive element and liquid level detector assembled thereby |
| CN102435257A (en) * | 2011-09-30 | 2012-05-02 | 广东天际电器股份有限公司 | Liquid level sensor and liquid level detection method thereof |
| CN206311169U (en) * | 2016-12-07 | 2017-07-07 | 陈飞帆 | A kind of heat transfer temperature induction type liquid-level switch |
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| CN106404109A (en) | 2017-02-15 |
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