CN212321246U - Microbial film BOD detects accurate temperature regulating device for appearance liquid dilution equipment - Google Patents
Microbial film BOD detects accurate temperature regulating device for appearance liquid dilution equipment Download PDFInfo
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- CN212321246U CN212321246U CN202020652935.9U CN202020652935U CN212321246U CN 212321246 U CN212321246 U CN 212321246U CN 202020652935 U CN202020652935 U CN 202020652935U CN 212321246 U CN212321246 U CN 212321246U
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Abstract
The utility model discloses an accurate temperature control device for microbial film BOD detection sample liquid dilution equipment, which comprises a sample liquid container arranged in a detection environment, and also comprises a touch screen, a controller, a Peltier plate, a sample liquid container temperature sensor and an environment temperature sensor; a first input port of the controller is connected with a touch screen, and a second input port of the controller is connected with an ambient temperature sensor; the output port of the controller is connected with a Peltier patch, the Peltier patch is attached to the wall of the sample liquid container, a sample liquid container temperature sensor is arranged between the sample liquid container and the Peltier patch, and the measurement signal output end of the sample liquid container temperature sensor is connected with a third input port of the controller; the device controls the temperature of the sample liquid by the Peltier technology, has good temperature field uniformity and small temperature fluctuation, is beneficial to exerting the activity of the microbial membrane, and ensures that the measured BOD has good repeatability.
Description
Technical Field
The utility model relates to a check out test set technical field specifically is a biomembrane BOD detects accurate temperature regulating device for appearance liquid dilution equipment.
Background
BOD, also called Biochemical oxygen demand (abbreviated as BOD), is a comprehensive index representing the content of aerobic pollutants such as organic matters in water, and is the amount of dissolved oxygen required by aerobic microorganisms in water to decompose organic matters in water into inorganic matters at a certain temperature during the oxidation process within a certain period of time.
The national standard detection method of the biochemical oxygen demand is a dilution inoculation method, and the method has long manual dilution time, is complicated and is easy to cause human errors; and the temperature control is difficult in the sample introduction process after dilution, and the environmental temperature of the microbial membrane is easily influenced during sample introduction, so that the activity of the microbial membrane is damaged. The biochemical oxygen demand measuring instrument based on the microbial membrane electrode method has the concrete embodiment that each link used by the biochemical oxygen demand measuring instrument based on the microbial membrane electrode method can influence the BOD indicating value, such as important operations of manually diluting a standard solution, heating by adopting a heating rod, injecting by adopting a trace injection needle and the like. Wherein, the standard solution is diluted manually and the sample is injected by a trace sample injection needle, and the manual operation is adopted, so that inevitable manual errors exist; the biological bacteria on the microbial membrane in the biochemical oxygen demand measuring instrument adopting the microbial membrane electrode method are sensitive to temperature, so that the temperature of the sample liquid is required to be kept consistent with the temperature of the environment where the microbial membrane is located as far as possible, but in the prior art, only a heating rod can be adopted to heat the sample liquid, but the sample liquid cannot be refrigerated, so that the temperature of the sample liquid cannot be adjusted when the temperature of the environment where the microbial membrane is located is lower than the temperature of the sample liquid, the microbial membrane is subjected to large temperature fluctuation during sample injection detection, and the temperature of the whole detection environment is impacted by the temperature of the sample liquid, so that the temperature field is unstable, the temperature uniformity is poor, the temperature fluctuation degree is large, and the measured BOD repeatability is poor; has great influence on BOD value and BOD stability.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a biofilm BOD detects accurate temperature regulating device for appearance liquid dilution equipment, this device does not have the fuzzy neuron PID control method of static discrepancy nature with the structure, and the heating adopts the Peltier technique with the refrigeration module, and the temperature field homogeneity is good, and the temperature fluctuation is little, is favorable to exerting the biofilm activity, makes to measure BOD repeatability good, has solved the problem among the prior art.
In order to achieve the above object, the utility model provides a following technical scheme: an accurate temperature control device for microbial membrane BOD detection sample liquid dilution equipment comprises a sample liquid container arranged in a detection environment, and further comprises a touch screen, a controller, a Peltier chip, a sample liquid container temperature sensor and an environment temperature sensor; a first input port of the controller is connected with a touch screen, and a second input port of the controller is connected with an ambient temperature sensor; the output port of the controller is connected with a Peltier patch, the Peltier patch is attached to the wall of a sample liquid container, the sample liquid container contains dilution liquid, a sample liquid container temperature sensor is arranged between the sample liquid container and the Peltier patch, and the measurement signal output end of the sample liquid container temperature sensor is connected with a third input port of the controller.
Preferably, the controller drives the peltier chip through an H-bridge driving circuit, and the controller controls the H-bridge driving circuit through a PWM output circuit.
Preferably, a signal conditioning circuit and an AD conversion circuit are arranged between the sample liquid container temperature sensor and the controller, and output data of the sample liquid container temperature sensor is received by the controller through conditioning conversion of the signal conditioning circuit and the AD conversion circuit.
Preferably, the controller is an MCU chip LPC module based on Cortex-M3 and is provided with a power supply module.
Preferably, the sample solution container temperature sensor is a PT100 temperature sensor.
Preferably, the ambient temperature sensor is a DS18B20 temperature sensor.
Preferably, the H-bridge driving circuit is of an "H" type formed by four MOS transistors, and the peltier chip is disposed on a middle bar of the "H".
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model discloses an input the settlement temperature through the touch-sensitive screen, at first survey the temperature of detection environment through ambient temperature sensor, the difference between the controller calculates and the setting value according to the information of gathering, judge whether ambient temperature satisfies the temperature control condition of accurate temperature regulating device for biomembrane BOD detection appearance liquid dilution equipment; furthermore, a sample liquid container temperature sensor detects the temperature of the sample liquid container in real time, then sends information to the controller, and the control room accurately calculates heating or refrigerating power through a fuzzy neuron PID control method by utilizing a fuzzy neuron PID control method with an internal structure without static error. When the sample liquid container fluctuates because of the injection of new liquid, the Peltier patch can quickly and accurately control the sample liquid container to reach a constant temperature, and the temperature of the detection environment of the detector is prevented from being influenced when the sample liquid in the sample liquid container enters the detector, so that the constancy of the detection environment temperature is ensured, the activity of a microbial film is ensured, and the harsh environmental conditions for the use of the microbial film are greatly met.
Drawings
FIG. 1 is a schematic view of the overall structure of an accurate temperature control device for a microbial membrane BOD detection sample liquid diluting device of the present invention;
FIG. 2 is a schematic diagram of an H-bridge driving circuit of an accurate temperature control device for microbial membrane BOD detection sample liquid dilution equipment of the present invention;
fig. 3 is the utility model discloses a microbial film BOD detects accurate temperature regulating device's for appearance liquid dilution equipment algorithm sketch map.
The figures are labeled as follows: 1. a touch screen; 2. a controller; 3. a Peltier patch; 4. a sample liquid container; 5. a sample liquid container temperature sensor; 6. a signal conditioning circuit; 7. an AD conversion circuit; 8. an ambient temperature sensor; 9. a PWM output circuit; 10. h bridge drive circuit.
Detailed Description
The technical solution 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 only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Referring to fig. 1-3, in embodiment 1, an accurate temperature control device for a microbial membrane BOD detection sample liquid dilution apparatus includes a sample liquid container 4 disposed in a detection environment, and further includes a touch screen 1, a controller 2, a peltier chip 3, a sample liquid container temperature sensor 5, and an ambient temperature sensor 8; a first input port of the controller 2 is connected with the touch screen 1, and a second input port of the controller 2 is connected with an ambient temperature sensor 8; the output port of the controller 2 is connected with a Peltier patch 3, the Peltier patch 3 is attached to the outer wall of a sample liquid container 4, a sample liquid container temperature sensor 5 is arranged between the sample liquid container 4 and the Peltier patch 3, and the measuring signal output end of the sample liquid container temperature sensor 5 is connected with the third input port of the controller 2.
Embodiment 3, an accurate temperature control device for a microbial membrane BOD detection sample liquid dilution apparatus, comprising a sample liquid container 4 arranged in a detection environment, further comprising a touch screen 1, a controller 2, a peltier chip 3, a sample liquid container temperature sensor 5, and an ambient temperature sensor 8; a first input port of the controller 2 is connected with the touch screen 1, and a second input port of the controller 2 is connected with an ambient temperature sensor 8; the output port of controller 2 is connected with the input of peltier 3 piece, and peltier 3 piece pastes the outer wall of locating sample liquid container 4, and sample liquid container 4 holds liquid, is equipped with sample liquid container temperature sensor 5 between sample liquid container 4 and peltier 3 piece, and the sense terminal of sample liquid container temperature sensor 5 is used for the temperature of real-time detection sample liquid container 4, and the third input port of controller 2 is connected to the measurement signal output of sample liquid container temperature sensor 5.
The controller 2 is an MCU chip LPC1752 module based on Cortex-M3 and is provided with a power supply module.
The sample liquid container temperature sensor 5 is a PT100 temperature sensor.
The ambient temperature sensor 8 is a DS18B20 temperature sensor.
The H-bridge driving circuit 10 is of an "H" type formed by four MOS transistors, and the peltier element 3 is disposed on a middle bar of the "H".
In summary, the following steps: the device inputs the set temperature through the touch screen 1, firstly, the temperature of the detection environment is detected through the environment temperature sensor 8, the controller 2 calculates the difference value between the set value and the detected information, and whether the environment temperature meets the temperature control condition of the accurate temperature control device for the microbial membrane BOD detection sample liquid dilution equipment is judged; collecting the temperature of a sample liquid container 4 according to a sample liquid container temperature sensor 5, calculating the required heating or refrigerating power by a controller 2 according to a fuzzy PID algorithm, converting the heating or refrigerating power into a PWM signal, outputting the PWM signal through an I/O port, and controlling the duty ratio of an H-bridge driving circuit 10 so as to control the heating or refrigerating power; and PWM signals are output through different I/O ports to control corresponding MOS tubes on the H bridge, so that the function control of the Peltier chip 3 is realized. The difference calculation is the function carried by the controller itself, belongs to the existing mature technology, and does not belong to the protection scope of the utility model. The Peltier 3 heats or refrigerates the sample liquid container 4, so that the sample liquid in the sample liquid container 4 reaches a set value temperature (the set value is consistent with the optimal activity environment temperature of the microbial membrane); when the sample liquid is led into the detector, the sample liquid is prevented from damaging the environment in the detector as much as possible, so that the temperature fluctuation is small, the temperature impact is small, the temperature field is stable, the temperature uniformity is good, and the BOD measurement repeatability is high.
As shown in fig. 2, the requirement for the normal driving of the H-type driving circuit 10 is that a pair of MOS transistors on the diagonal line are simultaneously turned on to form a current loop; the working states (on and off) of the four MOS tubes determine whether to control the specific working mode to be heating or cooling. PWM driven H-bridges are also referred to as switched mode drives. Under the action of PWM, the output power is adjustable, the MOS tube is used as a high-frequency switch to work between a saturation state and a cut-off state, and a nonlinear region is conducted when power needs to be supplied to a load, so that the maximum load power can be controlled by using the minimum power consumption. The four MOS tubes form a bridge, currents in different directions flow through the Peltier 3, and double functions of heating and refrigerating can be realized only by using a single power supply. Compared with linear driving, the driving can obviously reduce the heat production of the tube, because the MOS tube has current only when being conducted and the conduction resistance of the tube is very small, the working efficiency is high, and the reaction speed is faster.
The controller 2 adopts a fuzzy PID-based temperature control algorithm: the adaptive fuzzy PID control system structure mainly comprises a parameter controllable PID and a fuzzy control system. The parameter controllable PID completes the control of the system, and the fuzzy control system realizes the automatic correction of 3 parameters of the PID. The fuzzy PID algorithm belongs to the prior mature technology, and does not belong to the protection scope of the utility model.
As shown in fig. 3, the fuzzy PID control includes several important components such as parameter fuzzification, fuzzy rule inference, parameter defuzzification, and PID controller. The MCU calculates the deviation e between the actual position and the theoretical position and the current deviation change ec according to the set input and feedback signals, performs fuzzy reasoning according to a fuzzy rule, finally performs fuzzy solution on the fuzzy parameter, and outputs the proportional, integral and differential coefficients of the PID controller.
The device adopts a fuzzy neuron PID control algorithm without static difference in structure, and the heating and refrigerating modules adopt the Peltier technology, so that the temperature field uniformity is good, the temperature fluctuation is small, the activity of the microbial membrane can be favorably exerted, and the repeatability of BOD measurement is good.
Having shown and described the basic principles and principal features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a microbial film BOD detects accurate temperature regulating device for sample liquid dilution equipment, is including locating the sample liquid container among the testing environment, its characterized in that: the device also comprises a touch screen, a controller, a Peltier patch, a sample liquid container temperature sensor and an environment temperature sensor; a first input port of the controller is connected with a touch screen, and a second input port of the controller is connected with an ambient temperature sensor; the output port of the controller is connected with a Peltier patch, the Peltier patch is attached to the wall of a sample liquid container, the sample liquid container is used for containing dilution liquid, a sample liquid container temperature sensor is arranged between the sample liquid container and the Peltier patch, and the measurement signal output end of the sample liquid container temperature sensor is connected with a third input port of the controller.
2. The accurate temperature control device for microbial membrane BOD detection sample liquid dilution equipment according to claim 1, characterized in that: the controller drives the Peltier through an H-bridge driving circuit, and controls the H-bridge driving circuit through a PWM output circuit.
3. The accurate temperature control device for microbial membrane BOD detection sample liquid dilution equipment according to claim 1, characterized in that: and a signal conditioning circuit and an AD conversion circuit are arranged between the sample liquid container temperature sensor and the controller, and output data of the sample liquid container temperature sensor is received by the controller through conditioning conversion of the signal conditioning circuit and the AD conversion circuit.
4. The accurate temperature control device for microbial membrane BOD detection sample liquid dilution equipment according to claim 1, characterized in that: the controller is an MCU chip LPC module based on Cortex-M3 and is provided with a power supply module.
5. The accurate temperature control device for microbial membrane BOD detection sample liquid dilution equipment according to claim 1, characterized in that: and the sample liquid container temperature sensor is a PT100 temperature sensor.
6. The accurate temperature control device for microbial membrane BOD detection sample liquid dilution equipment according to claim 1, characterized in that: the ambient temperature sensor is a DS18B20 temperature sensor.
7. The accurate temperature control device for microbial membrane BOD detection sample liquid dilution equipment according to claim 2, characterized in that: the H-bridge driving circuit is of an H shape formed by four MOS tubes, and a connection port of the Peltier patch is arranged on a middle cross bar of the H shape.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280183A (en) * | 2021-12-23 | 2022-04-05 | 鲲鹏仪器(大连)有限公司 | Temperature control device and method for column oven of liquid chromatograph |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280183A (en) * | 2021-12-23 | 2022-04-05 | 鲲鹏仪器(大连)有限公司 | Temperature control device and method for column oven of liquid chromatograph |
| CN114280183B (en) * | 2021-12-23 | 2024-02-23 | 华谱科仪(北京)科技有限公司 | Temperature control device and method for column temperature box of liquid chromatograph |
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