CN111307492A - System and method for judging multiple faults of thermostatic bath through temperature sensor combination - Google Patents
System and method for judging multiple faults of thermostatic bath through temperature sensor combination Download PDFInfo
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- CN111307492A CN111307492A CN202010257625.1A CN202010257625A CN111307492A CN 111307492 A CN111307492 A CN 111307492A CN 202010257625 A CN202010257625 A CN 202010257625A CN 111307492 A CN111307492 A CN 111307492A
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Abstract
The invention relates to the technical field of thermostatic baths, in particular to a system and a method for judging various faults of a thermostatic bath through temperature sensor combination, which comprises a liquid container, a temperature control system, a stirring system and a heating and refrigerating system, wherein the system is provided with a first temperature sensor and a second temperature sensor, the first temperature sensor is connected with a low-precision temperature controller for protection, and is used for cutting off a power supply for the whole thermostatic bath when obvious over-temperature faults occur; and the second temperature sensor is connected with a precise temperature controller to control the temperature of the whole thermostatic bath. In the thermostatic bath, only a plurality of temperature sensors of a single type form a monitoring system. The temperature sensors are used independently or cooperatively, can realize the monitoring of various physical parameters at high temperature and the problem that the temperature control sensor increases the spare tire, and can be used for solving various monitoring requirements in the thermostatic bath.
Description
Technical Field
The invention relates to the technical field of thermostatic baths, in particular to a system and a method for judging various faults of a thermostatic bath through temperature sensor combination.
Background
The stirring system of the thermostatic bath is an important part of the thermostatic bath, and mainly comprises a motor which drives a long-shaft stirring blade to stir liquid in the thermostatic bath, thereby forming a stable temperature field. If the system can not work normally, the temperature of the liquid at each point in the tank becomes greatly different. If the abnormality of the stirring system cannot be found in time, the temperature of the area of the thermostatic groove part is overhigh, the silicone oil in the thermostatic groove part exceeds a flash point to burn, and accidents such as fire disasters are caused.
The usual method for judging whether the stirring system is working normally is to use a rotating speed recording instrument. However, in the practical use scenario of the thermostatic bath, the conventional rotation speed measurement method makes the device complicated and heavy due to the limited assembly space. In addition, because of the interference factors such as high temperature and smoke, the false alarm is often caused by various reasons. Moreover, even if the motor rotates normally, the long-shaft blade still has the risk of falling off and the like. If the rotating speed of the motor is measured normally, the normal operation of the stirring system cannot be ensured.
The open circuit or short circuit of the sensor can cause the measurement system to lose the control basis, thus causing the alarm and stopping temperature control, and causing the equipment to stop working; conventional thermostats are not designed with back-up sensors and once damaged, the equipment can only be deactivated.
The failure of the power electronic device can cause rapid temperature rise and cannot reduce the speed (the throttling device burns through and cannot control the temperature). The traditional thermostatic bath control system can not find defects instantly, and only when the temperature is continuously out of control to reach the upper limit and the lower limit, a protection action can be sent out, and accidents such as burning or freezing of loaded objects in a container can be caused during the protection action.
The reduction of the heat-conducting medium can cause the liquid level in the container to drop below the guide plate, and the stirrer can not push the medium to complete the circulation. The traditional device either uses the manual work to look over the liquid level, can't realize automatic protection, or increases the liquid level test chamber, uses the linker to link to each other with the main container, installs the level gauge in the liquid level test chamber, has avoided the high temperature to damage the level gauge. But also introduces the problems of complex structure, great damage to a temperature field and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses a system and a method for judging various faults of a thermostatic bath through temperature sensor combination, which solve the problems that the liquid level in a container is lowered below a guide plate due to the reduction of heat-conducting media, and a stirrer cannot push the media to complete circulation. The traditional device either uses the manual work to look over the liquid level, can't realize automatic protection, or increases the liquid level test chamber, uses the linker to link to each other with the main container, installs the level gauge in the liquid level test chamber, has avoided the high temperature to damage the level gauge. But also introduces the problems of complex structure, great damage to a temperature field and the like.
The invention is realized by the following technical scheme:
the invention discloses a system for judging multiple faults of a thermostatic bath through temperature sensor combination, which comprises a liquid container, a temperature control system, a stirring system and a heating and refrigerating system and is characterized in that the system is provided with a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is connected with a low-precision temperature controller for protection and is used for cutting off a power supply for the whole thermostatic bath when obvious over-temperature faults occur; and the second temperature sensor is connected with a precise temperature controller to control the temperature of the whole thermostatic bath.
Further, the difference between the temperature systems of the first temperature sensor and the second temperature sensor is less than 1 ℃.
Furthermore, the first temperature sensor and the second temperature sensor penetrate through the sensor seat, sequentially penetrate through the sensor limiting pieces welded on the inner wall of the inner container of the groove cavity and are finally fixed by screws, and the sensors are fixed on the plug board seat.
Furthermore, the stirring paddle of the thermostatic bath penetrates through the center of the electric heater, and the vertical position of the stirring paddle of the thermostatic bath is flush with the lower end of the electric heater.
In a second aspect, the present invention discloses a method for judging multiple faults of a thermostatic bath through a temperature sensor combination, which uses the system for judging multiple faults of a thermostatic bath through a temperature sensor combination of the first aspect, and is characterized in that the method comprises the following steps:
s1, the power-on work of the thermostatic bath enters detection initialization;
s2, judging whether the stirring system is abnormal or not by comparing the temperature difference of the temperature sensors at different height differences;
s3, continuously monitoring the temperature value of the temperature sensor, recording the temperature change rate, and comparing the temperature change rate with the control intention of the system;
s4, if the temperature is controlled to be increased, the change rate should be a positive value, and if the temperature is controlled to be decreased, the change rate should be a negative value; otherwise, the breakdown of the temperature control system can be judged;
and S5, judging whether the high-temperature liquid level is normal through the temperature sensor, and outputting a final judgment result.
Furthermore, if the temperature sensor in the S5 is tilted at an angle of 45 degrees, the liquid level is lower than T3' and higher than T3 during normal operation; the T3' temperature value is not less than 5 ℃ higher than T3.
Furthermore, if the temperature of the liquid is consistent with that of T2, the liquid level is excessive; if the two are close to each other and do not match T2, the liquid level is too low.
Furthermore, in S2, the control software system measures and compares the indication values of the two temperature sensors in real time, judges that the temperature difference exceeds 5 ℃, immediately alarms, and stops the operation of the thermostatic bath.
Furthermore, the position of the temperature measuring point close to the temperature sensor is set as a redundant backup, when one measuring point has a fault, the other measuring point is switched by the electronic switch, the fault sensor is thrown away, and the backup temperature sensor is connected.
Furthermore, the temperature sensor performs derivative operation on the temperature with respect to time, and the judgment on the temperature rising speed is that the solid-state relay loses the turn-off capability or the heater is in an open circuit.
The invention has the beneficial effects that:
in the thermostatic bath, only a plurality of temperature sensors of a single type form a monitoring system. The temperature sensors are used independently or cooperatively, can realize the monitoring of various physical parameters at high temperature and the problem that the temperature control sensor increases the spare tire, and can be used for solving various monitoring requirements in the thermostatic bath.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for determining multiple failures of a thermostatic bath through a combination of temperature sensors;
FIG. 2 is a schematic step diagram of a method for determining multiple faults of a thermostatic bath by a combination of temperature sensors;
FIG. 3 is a schematic diagram of detecting liquid level at high temperature in an embodiment of the present invention;
FIG. 4 is an overall frame diagram of the present invention;
FIG. 5 is a schematic diagram of the overall structure of the present invention;
FIG. 6 is a schematic diagram of the temperature control portion of an embodiment of the present invention;
the reference numerals in the drawings denote:
1. the device comprises a first temperature sensor, a second temperature sensor, a third temperature sensor, an electric heater, a fourth temperature sensor, a stirring motor, a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a fifth temperature sensor, a sixth.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment shown in fig. 1 discloses a system for judging multiple faults of a thermostatic bath through temperature sensor combination, which comprises a liquid container, a temperature control system, a stirring system and a heating and refrigerating system, and is characterized in that the system is provided with a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is connected with a low-precision temperature controller for protection and is used for cutting off a power supply for the whole thermostatic bath when obvious over-temperature faults occur; and the second temperature sensor is connected with a precise temperature controller to control the temperature of the whole thermostatic bath.
The temperature system difference between the first temperature sensor and the second temperature sensor is less than 1 ℃. The first temperature sensor and the second temperature sensor penetrate through the sensor seat, sequentially penetrate through the sensor limiting pieces welded on the inner wall of the inner container of the groove cavity and are finally fixed by screws, and the sensors are fixed on the plug board seat. The stirring paddle of the thermostatic bath penetrates through the center of the electric heater, and the vertical position of the stirring paddle is flush with the lower end of the electric heater.
The novel thermostatic bath of the embodiment can be provided with two temperature sensors, one of which is used for controlling the temperature and is always connected to the temperature controller for protection, so that the power supply of the thermostatic bath is cut off when abnormality occurs. The two temperature sensors are respectively arranged at the position that one temperature sensor is close to the electric heater, and the other temperature sensing part is more than 20 cm lower than the former temperature sensing part. There is also a new use of these two sensors: namely, the temperature difference between the two temperature sensors is detected to be above 5 ℃ through continuous monitoring of an automatic control system, and then an alarm is given immediately. A large number of experiments show that when the stirring system stops working, the temperature difference between the two sensors is inevitably more than 5 ℃. Both constitute sufficient requirements.
Example 2
The embodiment shown in fig. 2 discloses a method for judging multiple faults of a thermostatic bath through a temperature sensor combination, which comprises the following steps:
s1, the power-on work of the thermostatic bath enters detection initialization;
s2, judging whether the stirring system is abnormal or not by comparing the temperature difference of the temperature sensors at different height differences;
s3, continuously monitoring the temperature value of the temperature sensor, recording the temperature change rate, and comparing the temperature change rate with the control intention of the system;
s4, if the temperature is controlled to be increased, the change rate should be a positive value, and if the temperature is controlled to be decreased, the change rate should be a negative value; otherwise, the breakdown of the temperature control system can be judged;
and S5, judging whether the high-temperature liquid level is normal through the temperature sensor, and outputting a final judgment result.
If the temperature sensor in the S5 is tilted at an angle of 45 degrees, the liquid level is lower than T3' and higher than T3 during normal work; the T3' temperature value is not less than 5 ℃ higher than T3. If the temperatures of the two are consistent and consistent with T2, the liquid level is excessive; if the two are close to each other and do not match T2, the liquid level is too low.
And in the S2, the control software system measures and compares the indicating values of the two temperature sensors in real time, judges that the temperature difference exceeds 5 ℃, immediately alarms, and stops the work of the thermostatic bath.
And when one measuring point has a fault, the other measuring point is switched by an electronic switch, the fault sensor is thrown away, and the backup temperature sensor is accessed.
The temperature sensor performs derivative operation on time through temperature, and the judgment of the temperature rising speed is that the solid-state relay loses the turn-off capacity or the heater is in an open circuit.
Example 3
This example discloses a thermostatic bath (see fig. 3-6) equipped with two temperature sensors. Wherein the height difference between the temperature sensing part of the first temperature sensor and the temperature sensing part of the second temperature sensor is more than 20 cm. The second temperature sensor is connected with a precise temperature controller to control the temperature of the whole thermostatic bath. The first temperature sensor is connected with a low-precision protection temperature controller and used for cutting off the power supply of the whole thermostatic bath when an obvious over-temperature fault occurs.
Under normal conditions, the temperature system difference between the first temperature sensor and the second temperature sensor is less than 1 ℃. When the stirring system stops operating, the electric heater operates in one side to cause the temperature of the middle upper part of the thermostatic bath to rise sharply. Since the liquid cannot flow, the temperature of the position where the temperature sensing probe portion of the sensor is located does not rise.
The sensor seat of the novel thermostatic bath is fixed on the plug seat. First temperature sensor and second temperature sensor pass the sensor seat to pass in proper order and weld the spacing piece of sensor in vallecular cavity inner bag inner wall, and the back is by the fix with screw, prevents that first temperature sensor and second temperature sensor are not hard up to drop, avoids causing destruction to sensor itself, also avoids influencing temperature measurement's accuracy nature because of the sensor rocks simultaneously.
Wherein weld the spacing piece of sensor of vallecular cavity inner bag inner wall, played the effect of spacing direction to first temperature sensor and second temperature sensor, avoided because of sensor length is longer, the temperature sensing part of first temperature sensor and the temperature sensing part of second temperature sensor can touch inner bag wall or electric heater to influence the temperature measurement and read numerical value.
The stirring blade of the novel thermostatic bath penetrates through the center of the electric heater, and the vertical position of the stirring blade of the novel thermostatic bath is flush with the lower end of the electric heater. So that the stirring and heating of the cavity are easier to be ensured to be uniform.
The first temperature sensor and the second temperature sensor are inserted into the groove cavity outside the electric heater for temperature reading. Wherein the difference in height between the temperature sensing portion of the first temperature sensor and the temperature sensing portion of the second temperature sensor is about 220 mm. The temperature sensing part of the first temperature sensor is positioned at the upper position inside the direct heating area of the electric heater, the distance from the temperature sensing part of the first temperature sensor to the bottom of the heating area is about 130mm, the temperature sensing part of the second temperature sensor is positioned at the lower position outside the heating area of the electric heater, and the distance from the temperature sensing part of the second temperature sensor to the bottom of the heating area is about 90mm, namely, the distance from the temperature sensing.
Example 4
In the embodiment, only a single type of multiple temperature sensors are used to form a monitoring system. The temperature sensors are used independently or cooperatively, can realize the monitoring of various physical parameters at high temperature and the problem that the temperature control sensor increases the spare tire, and can be used for solving various monitoring requirements in the thermostatic bath.
If the system uses sensors A, B, C to form sensor groups, two platinum resistor chips are built into each sensor, see fig. 1 and 2.
Firstly, judging the abnormity of the stirring system
The temperature sensor comprises two independent sensors, namely a temperature control sensor and a protection sensor. If the two sensors are artificially designed to be at different positions, when the stirring system normally works, the temperature difference of the whole temperature zone is extremely small, and the temperatures of the two sensors are basically the same. When the stirring system cannot normally perform stirring duty, the temperature difference of more than 40 ℃ can occur at different heights of the two sensors.
Our control software system will measure in real time and compare the readings of the two temperature sensors. And immediately alarming once the temperature difference is found to exceed 5 ℃, and stopping the operation of the thermostatic bath.
Method for adding spare tire by temperature control sensor
12 and 14 of the sensors A, B are temperature measuring points with close positions, which can be used as redundant backup for each other, when one measuring point has a fault, the other measuring point is switched by an electronic switch, the fault sensor is thrown away, and the backup sensor is connected.
Thirdly, detecting the fault of the temperature control system
Continuously monitoring the temperature value of T1, recording the change rate of the temperature, and comparing the change rate with the control intention of the system, wherein when the temperature is raised, the change rate is a positive value, and when the temperature is decreased, the change rate is a negative value; otherwise, the breakdown of the temperature control system can be judged.
Fourthly, detecting the liquid level at high temperature
See fig. 2, sensor C is tilted up at a 45 angle. In normal work, the liquid level is lower than T3' and higher than T3; the temperature value of T3' is higher than T3 by not less than 5 ℃; if the temperatures of the two are consistent and consistent with T2, the liquid level is excessive; if the two are close and inconsistent with T2, the liquid level is too low; as the above rule, it can be judged whether the high temperature liquid level is normal.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A system for judging multiple faults of a thermostatic bath through temperature sensor combination comprises a liquid container, a temperature control system, a stirring system and a heating and refrigerating system, and is characterized in that the system is provided with a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is connected with a low-precision temperature controller for protection and is used for cutting off a power supply for the whole thermostatic bath when obvious over-temperature faults occur; and the second temperature sensor is connected with a precise temperature controller to control the temperature of the whole thermostatic bath.
2. The system for multiple fault determination of a thermostatic bath according to claim 1, wherein the difference between the temperature systems of the first and second temperature sensors is less than 1 ℃.
3. The system for judging multiple faults of the thermostatic bath through the temperature sensor combination according to claim 1, wherein the first temperature sensor and the second temperature sensor penetrate through the sensor seat, sequentially penetrate through sensor limiting pieces welded on the inner wall of the inner container of the bath cavity and are finally fixed through screws, and the sensors are fixed on the plug board seat.
4. The system for determining multiple faults of a thermostatic bath according to claim 1, wherein the stirring blades of the thermostatic bath penetrate through the center of the electric heater and are vertically positioned to be flush with the lower end of the electric heater.
5. A method for determining multiple faults of a thermostatic bath by means of a combination of temperature sensors, using a system for determining multiple faults of a thermostatic bath by means of a combination of temperature sensors according to any one of claims 1 to 4, characterized in that the method comprises the following steps:
s1, the power-on work of the thermostatic bath enters detection initialization;
s2, judging whether the stirring system is abnormal or not by comparing the temperature difference of the temperature sensors at different height differences;
s3, continuously monitoring the temperature value of the temperature sensor, recording the temperature change rate, and comparing the temperature change rate with the control intention of the system;
s4, if the temperature is controlled to be increased, the change rate should be a positive value, and if the temperature is controlled to be decreased, the change rate should be a negative value; otherwise, the breakdown of the temperature control system can be judged;
and S5, judging whether the high-temperature liquid level is normal through the temperature sensor, and outputting a final judgment result.
6. The method for determining multiple faults of a thermostatic bath according to claim 5, wherein if the temperature sensor in the S5 tilts at an angle of 45 degrees, the liquid level is lower than T3' and higher than T3 during normal operation; the T3' temperature value is not less than 5 ℃ higher than T3.
7. The method for determining multiple faults of a thermostatic bath according to claim 6, wherein if the temperatures of the two are consistent and consistent with T2, the liquid level is too high; if the two are close to each other and do not match T2, the liquid level is too low.
8. The method for determining multiple faults of a thermostatic bath according to claim 5, wherein in S2, the control software system measures and compares the indication values of the two temperature sensors in real time, determines that the temperature difference exceeds 5 ℃, immediately gives an alarm, and stops the operation of the thermostatic bath.
9. The method for judging multiple faults of the thermostatic bath through the temperature sensor combination as claimed in claim 5, wherein the position of the temperature measuring point close to the temperature sensor is set as a redundant backup, when one measuring point has a fault, the other measuring point is switched through an electronic switch, the fault sensor is thrown away, and the backup temperature sensor is connected.
10. The method for determining multiple faults of a thermostatic bath according to claim 5, wherein the temperature sensor performs temperature derivative operation on time, and the determination of the temperature rise speed is that the solid-state relay loses turn-off capability or the heater is opened.
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| CN202010257625.1A CN111307492B (en) | 2020-04-03 | 2020-04-03 | System and method for judging multiple faults of constant temperature tank through temperature sensor combination |
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| CN202010257625.1A CN111307492B (en) | 2020-04-03 | 2020-04-03 | System and method for judging multiple faults of constant temperature tank through temperature sensor combination |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112843395A (en) * | 2021-02-02 | 2021-05-28 | 乔艳萍 | Blood nursing heating device |
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| CN204412298U (en) * | 2014-12-04 | 2015-06-24 | 重庆材料研究院有限公司 | Scientific research and testing intelligent constant-temperature device |
| CN204881870U (en) * | 2015-04-21 | 2015-12-16 | 陈宝福 | Super temperature drop temperature warning circuit of thermostated container |
| CN106813796A (en) * | 2015-12-02 | 2017-06-09 | 富强 | A kind of thermostat automatic detection device |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102350385A (en) * | 2011-06-30 | 2012-02-15 | 西安交通大学 | High temperature thermostatic bath of high capacity and high precision |
| CN104330103A (en) * | 2014-10-14 | 2015-02-04 | 苏州德鲁森自动化系统有限公司 | Constant-temperature and constant-humidity system fault detection device |
| CN204347654U (en) * | 2014-12-04 | 2015-05-20 | 重庆材料研究院有限公司 | Scientific research and testing Intelligent Constant Temperature Controlling System |
| CN204412298U (en) * | 2014-12-04 | 2015-06-24 | 重庆材料研究院有限公司 | Scientific research and testing intelligent constant-temperature device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112843395A (en) * | 2021-02-02 | 2021-05-28 | 乔艳萍 | Blood nursing heating device |
| CN112843395B (en) * | 2021-02-02 | 2022-10-28 | 乔艳萍 | Blood nursing heating device |
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| CN111307492B (en) | 2023-08-29 |
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