Liquid volume determination method, device, electronic device and storage medium

Abstract

The present application provides a method, device, electronic device and storage medium for determining liquid volume, the method comprising: Step 1: Obtaining H max and H min Step 2: Get the refill reference h, and increase the liquid level of the target container from H to n times of h. min Rehydration to H min and the sum of n times h, up to H min The sum of n times h is greater than or equal to H max , and calculate the annual fluid usage C after each rehydration n Step 3: Update the rehydration baseline value to h m , repeat step 2 and calculate the annual fluid usage C after each rehydration m Step 4: C n and C m The minimum value of H min The sum of the value of n times h is used as the standard liquid volume of the target container when storing the target storage sample. Using the liquid volume determination method provided in the embodiment of the present application can avoid large temperature fluctuations in the target container, such as a liquid nitrogen tank; it can also reduce the annual usage of the stored liquid and avoid waste of stored liquid.

Description

Technical Field

[0001] The present application relates to the field of liquid quantity determination, and in particular, to a liquid quantity determination method, device, electronic device, and storage medium. Background Art

[0002] Fluid replenishment is a common problem in various fields, such as replenishing cleaning fluid during battery preparation, regularly replenishing fluid when using liquid to cool equipment in high-temperature working conditions, replenishing heat exchange fluids in the unit's circulation system, and replenishing fluids when storing biological samples through storage liquids.

[0003] Liquid nitrogen tanks are primarily used in the fields of biology, medicine, and pharmaceuticals. They can be used to store vaccines, bacterial and viral strains, and cells in the biomedical field for long-term active preservation. When needed, they can be taken out, thawed, and rewarmed. Liquid nitrogen generally refers to liquid nitrogen gas. Liquid nitrogen is an inert, colorless, odorless, non-corrosive, non-flammable liquid with an extremely low temperature (below -196.56°C). It absorbs a large amount of heat when vaporized. By filling a liquid nitrogen tank with liquid nitrogen and utilizing its extremely low temperature and heat absorption properties, the low-temperature environment inside the tank is maintained.

[0004] Because liquid nitrogen has a low boiling point (-196.56°C) and is easily vaporized, liquid nitrogen tanks typically have a vacuum insulation layer to slow heat transfer and thus volatilization. Even so, liquid nitrogen must be replenished in a timely manner to maintain a certain liquid nitrogen level to ensure that the temperature inside the tank fluctuates slightly within a set range. Currently, during the liquid nitrogen replenishment process, the liquid level threshold is set based on the operator's experience, which can easily lead to excessive liquid nitrogen retention and replenishment, resulting in liquid nitrogen waste. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a method, device, electronic device and storage medium for determining the amount of liquid, and to perform a plurality of liquid replenishment operations, each time according to the H of the target container. max and H of target storage sample min And the fluid level after rehydration changes from H min Consumes the sum of n times h to H min Calculate the annual usage of the stored liquid based on the time. Select the minimum annual usage from the many annual usages and find the H corresponding to the minimum annual usage. min and n times h, and H at this time min The sum of the standard liquid volume and n times h is used as the standard liquid volume. Each subsequent time the target stored sample is stored in the target container and refilling is required, the standard liquid volume is used for refilling. This avoids the waste of stored liquid caused by manual estimation of the refill volume. Applying this method to liquid level management in liquid nitrogen tanks can avoid unnecessary waste of liquid nitrogen.

[0006] In a first aspect, an embodiment of the present application provides a method for determining liquid volume, the method comprising: Step 1: obtaining the H of the target container; max and H of target storage sample min Among them, H max is the highest liquid level of the target container; H min When the target storage sample is stored in the target container, the target container satisfies the lowest liquid level of the storage condition for storing the target storage sample; Step 2: Obtain the rehydration reference h, and adjust the liquid level height of the target container from H to n times the rehydration reference h. min Rehydration to H min and the sum of n times h, up to H min The sum of n times h is greater than or equal to H max , and calculate the annual fluid usage C after each rehydration n ; Where n is a positive integer starting from 1 and increasing; Step 3: Update the rehydration baseline value to h m , repeat step 2 and calculate the annual fluid usage C after each rehydration m ; Step 4: C n and C m The minimum value of H min The sum of the value of n times h is used as the standard liquid volume of the target container when storing the target storage sample.

[0007] In the above implementation process, first obtain the H of the target container max and H of target storage sample min , then refill the fluid according to the refill standard, the first refill to H min The sum of the liquid consumption and h is used to calculate the annual liquid consumption C1; the second liquid replenishment is to H min The annual liquid usage C2 is calculated by adding h and 2h; after n times, n annual liquid usage is obtained. Further, h is reduced, and step 2 is performed n times, and the annual liquid usage after each rehydration is calculated. The minimum value of all annual liquid usage corresponds to H min The sum of h and h is used as the standard liquid volume. After the standard liquid volume is determined, each time the target stored sample is stored in the target container and needs to be replenished, the standard liquid volume is used for replenishment; thereby avoiding the waste of stored liquid caused by manual estimation of the replenishment volume.

[0008] Optionally, in the embodiment of the present application, the annual liquid usage C after each fluid replenishment is calculated. m Including: Get the liquid level height by H min and the sum of n times h decreases to H min Time taken Δt m ; According to the formula: C m =S×(H min +n×h)×365 / Δtm Calculate the annual liquid usage C of the target container m ; Where S is the cross-sectional area of ​​the target container.

[0009] In the above implementation process, according to H min The sum of n times h, the cross-sectional area S of the target container, and the liquid level after filling is determined by H min and the sum of n times h decreases to H min Time taken Δt m Accurately calculate the annual liquid usage each time. This allows you to accurately find multiple sets of liquid annual usage. The more times h changes, the higher the annual liquid usage C m The more abundant the quantity. Eventually from C m Determine the minimum value among them, so that C m H corresponding to small values min The sum of ⁻¹ and h is used as the standard liquid volume. This not only improves the efficiency of refilling the target container, but also reduces the annual usage of stored liquid. When applied to storing target objects in liquid nitrogen tanks, it can effectively reduce the annual usage of liquid nitrogen.

[0010] Optionally, in the embodiment of the present application, the H of the target container is obtained. max and H of target storage sample min Including: obtaining the effective volume of the target container, calculating H based on the effective volume and S max ; Monitor the temperature average of the center height of the target storage sample; Determine whether the temperature average of the center height of the target storage sample is greater than or equal to the highest storage temperature T0 of the target storage sample; If the temperature average of the center height of the target storage sample is greater than or equal to the highest storage temperature T0 of the target storage sample, obtain the liquid level height at which the temperature average rises to T0 and use it as the H value of the target storage sample. min .

[0011] In the above implementation process, H max , i.e. the maximum liquid level of the target container, is determined by the effective volume of the target container. And, H min , that is, when the target storage sample is stored in the target container, the target container satisfies the storage conditions for storing the target storage sample, which is determined by monitoring the average temperature of the center height of the target storage sample. Since different samples have standard storage temperatures, the temperature is determined to be above the maximum storage temperature by monitoring the average temperature of the center height of the target storage sample. When the average temperature of the center height of the target storage sample is equal to the corresponding storage temperature, the height at this time is determined as the H of the target storage sample. min By detecting the temperature average of the center height of the target storage sample, the H of the target storage sample can be accurately determined based on the target storage sample. min .

[0012] Optionally, in the embodiment of the present application, H is calculated based on the effective volume and S max Including: Get the ratio of effective volume to S and use it as the H of the target container max .

[0013] In the above implementation process, the ratio of the effective volume of the target container to the cross-sectional area S is used as the H of the target container. max , thus determining the H of each different target container based on the target container max .

[0014] Optionally, in an embodiment of the present application, obtaining the liquid level height when the average temperature rises to T0 includes: when the average temperature rises to T0, collecting the corresponding capacitance value by the capacitive liquid level sensor in the target container; and calculating the liquid level height based on the capacitance value.

[0015] In this implementation, a capacitive level sensor in the target container collects the corresponding capacitance value. Conventional differential pressure level sensors often fail to transmit pressure properly and measure properly if the drainage tube freezes. Capacitive level sensors measure liquid level by inserting a metal capacitive rod into the target container until it reaches the bottom. This eliminates the risk of frozen drainage tubes and improves level measurement accuracy.

[0016] Optionally, in an embodiment of the present application, monitoring the temperature average of the center height of the target storage sample includes: monitoring the resistance value from the center height of the target storage sample to the bottom of the container by a resistance bridge in the target container; and obtaining the temperature average of the center height of the target storage sample based on the resistance value.

[0017] In this implementation, the resistance bridge measures the resistance from the center of the target sample to the bottom of the container, and the average temperature at the center of the target sample is calculated from this resistance. Because the resistance bridge's resistance and temperature correspond one-to-one, the measured resistance can be converted into the corresponding temperature, accurately determining the average temperature at the center of the target sample.

[0018] Optionally, in an embodiment of the present application, in the embodiment of the first aspect of the present application, the target container is a liquid nitrogen tank, and the liquid level is a liquid nitrogen level.

[0019] In the above implementation process, since liquid nitrogen has a low boiling point (-196.56°C) and is very easy to vaporize, liquid nitrogen tanks usually have a vacuum insulation layer to slow down heat transfer, thereby slowing down the volatilization of liquid nitrogen; even so, liquid nitrogen must be replenished in the tank in a timely manner to ensure a certain liquid nitrogen level height, so as to ensure that the temperature in the tank fluctuates slightly within the set range. At present, in the process of replenishing liquid nitrogen, the control of the solenoid valve requires manual setting of the liquid level threshold, and the rehydration plan depends entirely on the experience of the operator; therefore, it is inevitable that there will be excessive liquid nitrogen retention and rehydration, resulting in waste of liquid nitrogen. After finding the standard liquid volume, the liquid volume determination method provided in the embodiment of the present application uses the standard liquid volume for each subsequent time when the target storage sample is stored in the target container and rehydration is required; thereby avoiding the waste of storage liquid caused by manual operation to estimate the rehydration volume.

[0020] In a second aspect, an embodiment of the present application provides a fluid replenishment device, which includes: a liquid level acquisition module, a fluid replenishment module, and a fluid replenishment amount determination module; the liquid level acquisition module is used to perform step 1: obtain the H of the target container max and H of target storage sample min Among them, H max is the highest liquid level of the target container; H min When the target storage sample is stored in the target container, the target container satisfies the lowest liquid level of the storage condition for storing the target storage sample; the rehydration module is used to execute step 2: obtain the rehydration reference h, and adjust the liquid level height of the target container from H to n times the rehydration reference h multiple times. min Rehydration to H min and the sum of n times h, up to H min The sum of n times h is greater than or equal to H max , and calculate the annual fluid usage C after each rehydration n ; Wherein, n is a positive integer that increases from 1; the rehydration module is also used to execute step 3: update the rehydration reference value to h m , repeat step 2 and calculate the annual fluid usage C after each rehydration m ; Fluid volume determination module, used to execute step 4: C n and C m The minimum value of H min The sum of the value of n times h is used as the standard liquid volume of the target container when storing the target storage sample.

[0021] In a third aspect, an embodiment of the present application provides an electronic device, which includes a memory and a processor, wherein program instructions are stored in the memory, and when the processor reads and runs the program instructions, it executes the steps in any of the above implementation methods.

[0022] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer program instructions are stored in the computer-readable storage medium. When the computer program instructions are read and executed by a processor, the steps in any of the above implementation methods are executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0025] Figure 2 A flow chart for determining the amount of standard liquid provided in the embodiments of the present application;

[0026] Figure 3 A flowchart for obtaining the maximum and minimum liquid levels provided in the embodiment of the present application;

[0027] Figure 4 A schematic diagram of a module of a liquid volume determination device provided in an embodiment of the present application;

[0028] Figure 5 A graph showing the amount of fluid replacement and time provided in an embodiment of the present application;

[0029] Figure 6 A graph showing the amount of liquid replenishment and the annual usage of liquid nitrogen provided in the application examples. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of the systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each box in the flowchart or block diagram may represent a module, program segment, or portion of code, which contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes may also occur in an order different from that marked in the drawings. For example, two consecutive boxes may actually be executed substantially in parallel, or they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, as well as the combination of boxes in the block diagram and / or flowchart, may be implemented using a dedicated hardware-based system that performs the specified functions or actions, or may be implemented using a combination of dedicated hardware and computer instructions. In addition, the functional modules in the various embodiments of the present invention may be integrated together to form a separate part, or each module may exist separately, or two or more modules may be integrated to form a separate part.

[0031] During the research process, the applicant discovered that liquid nitrogen tanks are different from refrigeration devices such as traditional refrigerators. Liquid nitrogen absorbs a large amount of heat when it vaporizes. Liquid nitrogen is poured into the liquid nitrogen tank, and the extremely low temperature and vaporization heat absorption characteristics of liquid nitrogen are used to ensure a low-temperature environment in the tank. Usually, liquid nitrogen tanks have a vacuum insulation layer to slow down heat transfer, thereby slowing down the volatilization of liquid nitrogen. Even so, liquid nitrogen must be replenished in the tank in a timely manner to ensure a certain liquid nitrogen level height to ensure that the temperature in the tank fluctuates slightly within the set range. Traditional rehydration operations are performed by operators based on experience; therefore, it is inevitable that too much liquid nitrogen is retained or the amount of rehydration is too much, resulting in waste of liquid nitrogen.

[0032] Based on this, the liquid level determination solution provided in the embodiment of the present application performs the liquid replenishment operation multiple times, and each time according to the H of the target container max and H of target storage sample min And the fluid level after rehydration changes from H min Consumes the sum of n times h to H min Calculate the annual usage of the stored liquid based on the time. Select the minimum annual usage from the many annual usages and find the H corresponding to the minimum annual usage. min and n times h, and H at this time min The sum of 100 μg / L and n times h is used as the standard liquid volume. This solves the problem of liquid nitrogen waste caused by workers relying on experience in traditional liquid replenishment operations, thereby reducing the annual use of liquid nitrogen.

[0033] See Figure 1 , Figure 1 Schematic diagram of the structure of an electronic device provided in an embodiment of the present application. An electronic device 100 provided in an embodiment of the present application includes: a processor 101 and a memory 102, wherein the memory 102 stores machine-readable instructions executable by the processor 101, and when the machine-readable instructions are executed by the processor 101, the liquid volume determination method provided in the first aspect of the present application is performed.

[0034] The memory 102 may be, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), etc. The memory 102 is used to store programs, and the processor 101 executes the programs after receiving an execution instruction. The method executed by the electronic device 100 defined by the process disclosed in any embodiment of the present application may be applied to the processor 101 or implemented by the processor 101.

[0035] The processor 101 may be an integrated circuit chip with signal processing capabilities. The processor 101 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The various methods, steps and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0036] Please see Figure 2 , Figure 2 A flow chart for determining the amount of standard liquid provided in an embodiment of the present application; the method includes:

[0037] Step S100: Get the H of the target containermax and H of target storage sample min .

[0038] In the above step S100, the electronic device 100 obtains the H of the target container. max and H of target storage sample min It should be noted that H max is the highest liquid level of the target container; H min When the target storage sample is stored in the target container, the target container satisfies the lowest liquid level of the storage condition for storing the target storage sample. It can be understood by those skilled in the art that different containers correspond to different target container H. max and H of target storage sample min ;H max Determined by the parameters of the container itself, H min It is determined by the type of target storage sample and the type of target container.

[0039] Step S101: Obtain the refilling reference h, and adjust the liquid level of the target container from H to n times the refilling reference h. min Rehydration to H min and the sum of n times h, up to H min The sum of n times h is greater than or equal to H max , and calculate the annual fluid usage C after each rehydration n ; Where n is a positive integer that increases starting from 1.

[0040] In the above step S101, the electronic device 100 obtains the liquid filling reference h, and adjusts the liquid level height of the target container from H to n times of the liquid filling reference h. min Rehydration to H min and the sum of n times h, up to H min The sum of n times h is greater than or equal to H max , and calculate the annual fluid usage C after each rehydration n .

[0041] Step S102: Update the fluid replenishment reference value to h m Repeat step S101 and calculate the annual liquid usage C after each rehydration m .

[0042] In the above step S102, the electronic device 100 updates the fluid replenishment reference to h m , repeat the above step S101, and calculate the annual usage of the stored liquid each time. m Less than h, the fluid replenishment baseline continues to shrink.

[0043] Step S103: C n and Cm The minimum value of H min The sum of the value of n times h is used as the standard liquid volume of the target container when storing the target storage sample.

[0044] In the above step S103, the electronic device 100 sets C n and C m The minimum value of H min The sum of the value of n times h is used as the standard liquid volume of the target container when storing the target storage sample.

[0045] For example, the first time the fluid is replenished at the fluid replenishment reference h, the fluid level after replenishment is H min The annual liquid usage at this time is calculated as C1 by adding the liquid level h. The second time of rehydration is 2 hours, that is, after doubling the rehydration benchmark h, rehydration is carried out in 2 hours. The liquid level after rehydration is H. min The sum of 2 times h. In the subsequent rehydration, the rehydration baseline h is doubled until H min The sum of n times h is equal to or greater than H max Stop. Further, reduce the rehydration benchmark h to h min Repeat the above step S101 to obtain n groups C m . h can be further reduced to obtain more annual storage liquid usage. H corresponding to the minimum value of all annual usage min The sum of n times h is taken as the standard liquid volume.

[0046] pass Figure 2 It can be seen that the electronic device 100 first obtains the H of the target container max and H of target storage sample min , then refill the fluid according to the refill standard, the first refill to H min The sum of the liquid consumption and h is used to calculate the annual liquid consumption C1; the second liquid replenishment is to H min The annual liquid usage C2 is calculated by adding h and 2h; after performing this operation n times, n annual liquid usages are obtained. Further, h is reduced, and step 2 is performed n times again, and the annual liquid usage after each rehydration is calculated. The minimum value of all annual liquid usages corresponds to H min The sum of h and h is used as the standard liquid volume. After the standard liquid volume is determined, each time the target stored sample is stored in the target container and needs to be replenished, the standard liquid volume is used for replenishment; thereby avoiding the waste of stored liquid caused by manual estimation of the replenishment volume.

[0047] In an optional embodiment, the electronic device 100 obtains the liquid level by H min and the sum of n times h decreases to H min Time taken Δt m Then, according to the formula: Cm =S×(H min +n×h)×365 / Δt m Calculate the annual liquid usage C of the target container m ; Where S is the cross-sectional area of ​​the target container.

[0048] For example, if the target container is a liquid nitrogen tank with an inner tank diameter of D = 0.756m, its cross-sectional area is S = π(D / 2)2≈1.2㎡; the electronic device 100 obtains Δt m And cross section S according to C m =S×(H min +n×h)×365 / Δt m Annual liquid usage.

[0049] It can be seen from this that according to H min The sum of n times h, the cross-sectional area S of the target container, and the liquid level after filling is determined by H min and the sum of n times h decreases to H min Time taken Δt m Accurately calculate the annual liquid usage each time. This allows you to accurately find multiple sets of liquid annual usage. The more times h changes, the higher the annual liquid usage C m The more abundant the quantity. Eventually from C m Determine the minimum value among them, so that C m H corresponding to small values min The sum of h and h is used as the standard liquid volume. It can not only improve the efficiency of refilling the target container, but also reduce the annual usage of the stored liquid; when it is applied to the liquid nitrogen tank to store the target object, the annual usage of liquid nitrogen can be effectively reduced. It is worth noting that although the present application specifically provides embodiments of the annual usage of liquid nitrogen and the method for refilling the liquid nitrogen tank, it does not impose any restrictions on the specific application scenarios of the liquid volume determination method and the refilling method provided in the first aspect of the present application. Those skilled in the art should know that, in addition to being applied to specific liquid nitrogen tank refilling, the liquid volume determination method and refilling method provided in the present application can also be applied to other tanks or fluid media to perform refilling operations on other fluid media.

[0050] Please see Figure 3 , Figure 3 The maximum and minimum liquid levels are obtained as a flow chart provided in an embodiment of the present application. The method includes:

[0051] Step S200: Obtain the effective volume of the target container and calculate H based on the effective volume and S max .

[0052] In the above step S200, the electronic device 100 obtains the effective volume of the target container. It can be understood by those skilled in the art that if the target container is a liquid nitrogen tank, the effective volume is the maximum liquid nitrogen loading volume of the liquid nitrogen tank. The electronic device 100 calculates H based on the effective volume and the cross-sectional area. max .

[0053] Step S201: monitor the average temperature of the center height of the target storage sample; determine whether the average temperature of the center height of the target storage sample is greater than or equal to the highest storage temperature T0 of the target storage sample.

[0054] In step S201, the electronic device 100 determines whether the average temperature at the center of the target stored sample is greater than or equal to the maximum storage temperature T0 of the target stored sample. In actual use, the average temperature at the center of the sample is used to determine whether the storage temperature of the target stored sample is normal. If the average temperature at the center is greater than or equal to the maximum storage temperature T0 of the target stored sample, it indicates that the storage temperature of the target sample is abnormal and fluid rehydration is required.

[0055] Step S202: If the temperature average of the target storage sample center height is greater than or equal to the highest storage temperature T0 of the target storage sample, obtain the liquid level height at which the temperature average rises to T0 and use it as the H value of the target storage sample. min .

[0056] In the above step S202, when the average temperature of the center height of the target storage sample is greater than or equal to the highest storage temperature T0 of the target storage sample, the electronic device 100 obtains the liquid level at this time and uses the liquid level at this time as the H value of the target storage sample. min .

[0057] pass Figure 3 It can be seen that H max , i.e. the maximum liquid level of the target container, is determined by the effective volume of the target container. And, H min , that is, when the target storage sample is stored in the target container, the target container satisfies the storage conditions for storing the target storage sample, which is determined by monitoring the average temperature of the center height of the target storage sample. Since different samples have standard storage temperatures, the temperature is determined to be above the maximum storage temperature by monitoring the average temperature of the center height of the target storage sample. When the average temperature of the center height of the target storage sample is equal to the corresponding storage temperature, the height at this time is determined as the H of the target storage sample. min By detecting the temperature average of the center height of the target storage sample, the H of the target storage sample can be accurately determined based on the target storage sample. min .

[0058] In an optional embodiment, the electronic device 100 calculates H based on the effective volume and S max Including: Get the ratio of effective volume to S and use it as the H of the target container max For example, if the target container is a liquid nitrogen tank with an effective volume of 560L, the inner diameter of the liquid nitrogen tank is D = 0.756m, and the cross-sectional area of ​​the liquid nitrogen tank is S = π(D / 2) 2 ≈1.2㎡; then the H of the liquid nitrogen tank max It is 560 / S≈470mm.

[0059] It can be seen that the ratio of the effective volume of the target container to the cross-sectional area S is used as the H of the target container. max , thus determining the H of each different target container based on the target container max .

[0060] In an optional embodiment, the electronic device 100 obtains the liquid level height when the average temperature rises to T0, including: when the average temperature rises to T0, a capacitive liquid level sensor in the target container collects a corresponding capacitance value; and the electronic device 100 calculates the liquid level height based on the capacitance value. Those skilled in the art will appreciate that, compared to traditional differential pressure liquid level sensors, capacitive liquid nitrogen level sensors can simplify the structural design of the liquid nitrogen tank, eliminating the need for a drainage tube. Capacitive liquid nitrogen level sensors eliminate the risk of drainage tube freezing, thereby improving the accuracy of liquid level measurement.

[0061] It should be noted that when a capacitive liquid level sensor measures the liquid nitrogen level, it places a metal capacitor rod in the liquid nitrogen tank, extending to the bottom of the tank. The capacitor rod is a hollow metal rod with two identical, parallel metal sheets inside, similar to the two poles of a capacitor. The two poles are then connected to two wires to form a device. The two parallel metal sheets then form a parallel plate capacitor with a capacitance of C = εA / d, where ε is the dielectric constant of the medium between the parallel plate capacitors, A is the area covered by the two parallel plates, and d is the distance between the two parallel plates.

[0062] It is understandable that when there is no liquid nitrogen in the liquid nitrogen tank, the medium between the two parallel metal sheets is air, and the dielectric constant ε of air is 1 (the dielectric constant of pure nitrogen is 1.00058, which is approximately equal to the dielectric constant of air). At this time, the capacitance value C is a fixed value, which is defined as the zero-scale point of the capacitance sensor. When liquid nitrogen is slowly poured into the tank, the liquid nitrogen enters between the two parallel metal sheets. The dielectric constant ε of liquid nitrogen is known to be 2. At this time, the medium between the parallel metal sheets is a mixture of liquid nitrogen and nitrogen gas. The dielectric constant gradually approaches 2 as the liquid nitrogen liquid level rises. When the space between the two metal sheets is filled with liquid nitrogen, it can be defined as the full-scale point of the liquid level sensor. The change in dielectric constant causes a change in the capacitance of the parallel metal sheets, and the capacitance value of the parallel metal sheets can be collected and measured by the CDC chip (Capacitance-to-Digital Converter) on the transmitter; further, the capacitance value is converted into the liquid level height.

[0063] As can be seen, the capacitive level sensor in the target container collects the corresponding capacitance value. Traditional differential pressure level sensors often suffer from the problem of the drainage tube being frozen and unable to transmit pressure properly, resulting in inability to measure properly. Capacitive level sensors measure liquid level by inserting a metal capacitive rod into the target container until it reaches the bottom. This avoids the risk of drainage tube freezing and improves level measurement accuracy.

[0064] In an optional embodiment, monitoring the average temperature of the center height of the target storage sample includes: monitoring the resistance value from the center height of the target storage sample to the bottom of the container by a resistance bridge in the target container; and obtaining the average temperature of the center height of the target storage sample according to the resistance value.

[0065] It should be noted that the resistance bridge can be a resistance bridge type PT1000 platinum resistor. Since the resistance value of the PT1000 resistor corresponds to the temperature one-to-one, the corresponding temperature can be calculated through the corresponding relationship by measuring the resistance value, thereby realizing the measurement of the temperature in the liquid nitrogen tank.

[0066] From this, we can see that the resistance bridge monitors the resistance value from the center of the target storage sample to the bottom of the container, and then uses this resistance value to obtain the average temperature at the center of the target storage sample. Because the resistance value of the resistance bridge corresponds to the temperature value, the measured resistance value can be converted into the corresponding temperature value, thus accurately obtaining the average temperature at the center of the target storage sample.

[0067] In an optional embodiment, in the embodiment of the first aspect of the present application, the target container is a liquid nitrogen tank, and the liquid level is a liquid nitrogen level.

[0068] In one embodiment, the target container is a liquid nitrogen tank, and a biological sample stored at a standard temperature of -100°C is used as an example. First, the electronic device 100 fills the liquid nitrogen tank with a full scale height H. max of liquid nitrogen; among which, H max It is determined by the model of the liquid nitrogen tank and can be set through the display screen. Assume that the maximum filling level height of this liquid nitrogen tank is 200mm, and the real-time recording time is t0. Furthermore, the temperature at the height L0 above the liquid surface is monitored in real time; it should be noted that L0 is usually in the center area of ​​the tank where the biological sample is located. When the liquid level is full, the temperature at L0 is T0. Assuming that the storage temperature of the biological sample is T1 (T1 is greater than T0), T1 can be set through the display screen. Assume that T1 is -100℃. As the liquid nitrogen evaporates, the liquid level H in the tank drops, and the temperature at L0 will also begin to fluctuate. Generally, when the height H drops, the temperature in the liquid nitrogen tank approaches the standard temperature for storing the target sample after a period of time, and continues to rise.

[0069] The electronic device 100 measures the temperature at L0. When the temperature reaches -100°C, which is the limit of the sample storage temperature, the liquid level at this time and the time t1 are measured. The liquid level at this time is taken as H min Then ΔH=H max -H min =(200-H min )mm, Δt1=t1-t0, indicating that the liquid level changes from H max Reduce to H min Time used; then the annual usage of liquid nitrogen in the liquid nitrogen tank is C1 = S × ΔH × 365 / Δt1.

[0070] At this time, the liquid level is H min , then the liquid nitrogen tank needs to be replenished. The electronic device 100 controls the liquid replenishment solenoid valve to open for liquid replenishment, and the liquid replenishment height is H min and ΔH1, where ΔH1 is the refilling reference; the refilling reference can be set and modified through the display. If ΔH1 is set to 5mm at this time, when the liquid level reaches H min When the sum of ΔH1 and ΔH2 is reached, the electronic device 100 closes the liquid replenishing solenoid valve and records the time t2. Continue to monitor the temperature at L0. When the temperature at L0 reaches -100℃, it reaches the limit of the sample storage temperature. If the time t3 is recorded at this time, then the liquid level height increases from H min The sum of ΔH1 is reduced to H min The time used is Δt2=t3-t2; at this time, the annual usage of liquid nitrogen in the liquid nitrogen tank is C2=S×(H min +ΔH1)×365 / Δt2.

[0071] The liquid level at this time is H min, the liquid nitrogen tank needs to be replenished. The electronic device 100 controls the replenishment solenoid valve to open and replenish liquid nitrogen. When the liquid level reaches H min When the sum of H1 and 2ΔH1 is reached, close the solenoid valve and record the time t4, and continue to monitor the temperature at L0. When the temperature at L0 reaches -100℃, it reaches the limit of the sample storage temperature. If the time t5 is recorded at this time, the liquid level height will increase from H1 to H2. min The sum of 2ΔH1 is reduced to H min The time used is Δt3=t5-t4; at this time, the annual usage of liquid nitrogen in the liquid nitrogen tank is C3=S×(H min +2ΔH1)×365 / Δt3. The liquid level at this time is H min , need to replenish liquid; electronic equipment 100 controls the replenishment solenoid valve to open and replenish liquid nitrogen, when the liquid level reaches H min When the temperature reaches 3ΔH1, close the liquid replenishing solenoid valve and record the time t6; continue to monitor the temperature at L0.

[0072] Repeat the above process until H min The sum of nΔH1 is greater than or equal to H max Stop when

[0073] Finally, the electronic device 100 calculates and records the annual liquid nitrogen usage at different liquid replenishment rates, and plots a relationship curve with the liquid replenishment rate on the horizontal axis and the annual liquid nitrogen usage on the vertical axis. A point with the lowest annual liquid nitrogen usage can be found in the curve, and this point can be used in future liquid replenishment plans. That is, each time the liquid level reaches the lowest value H min When the liquid nitrogen is fully charged, the electronic device 100 controls the liquid replenishing solenoid valve to replenish the liquid according to this scheme, thereby minimizing the annual usage of liquid nitrogen in the liquid nitrogen tank, improving the utilization rate of liquid nitrogen, and avoiding unnecessary waste.

[0074] In an optional embodiment, the ambient temperature is 25° C., the ambient humidity is less than or equal to 80% RH; the target container is a liquid nitrogen tank, the liquid level is the liquid nitrogen level; the air flow rate in the liquid nitrogen tank storage chamber is not greater than 0.5 m / s, the effective volume of the liquid nitrogen tank is 560 L, and the inner tank diameter D is 0.756 m; the cross-sectional area of ​​the liquid nitrogen tank is calculated to be S = π(D / 2) 2 ≈1.2㎡; full scale height H max =560 / S≈470mm. The target sample storage temperature T1 is not lower than -150℃. When the full scale is reached, the temperature T0 at the height L0 of the sample center area is about -165℃.

[0075] The electronic device 100 continuously monitors the temperature change at L0. It should be noted that, under normal circumstances, the evaporation of liquid nitrogen will keep the tank in a state of thermal equilibrium for a relatively long period of time, and the temperature at L0 will fluctuate around -165°C with very small fluctuations. However, as the liquid nitrogen evaporates, the temperature T0 at L0 begins to rise. When the temperature rises to about -150°C, the thermal equilibrium is considered to be broken. The electronic device 100 obtains the liquid level height H at this time. min About 150mm.

[0076] The electronic device 100 detects the liquid level in the liquid nitrogen tank from the full scale height H max (ie 470mm) down to H min (ie 150mm) time is about 55 days. That is to say, if each time by H min Rehydration to H max , it can be used for about 55 days; if the annual liquid nitrogen usage in this case is calculated, C1=S×(H max -H min )×365 / Δt1=2548L, where Δt1 is 55 days.

[0077] If the liquid filling reference h obtained by the electronic device 100 is 10 mm, then when the liquid is filled to H min At 10 mm above the surface (i.e., 160 mm), the time it takes for the electronic device 100 to obtain the liquid level from 160 mm to 150 mm is approximately 27.5 days. If the annual liquid nitrogen usage in this case is calculated as C2 = S × (H max +10mm)×365 / Δt2=2552L, where Δt2 is 27.5 days.

[0078] The liquid level at this time is H min (i.e. 150 mm), the electronic device 100 controls the fluid replenishment to H min At 20 mm above the surface (i.e., 170 mm), the time it takes for the electronic device 100 to obtain the liquid level from 170 mm to 150 mm is approximately 29.8 days. If the annual liquid nitrogen usage in this case is calculated as C3 = S × (H max +20mm)×365 / Δt3=2499L, where Δt3 is 29.8 days.

[0079] It is understood by those skilled in the art that when 10 mm is used as the rehydration benchmark, the process stops at the 17th rehydration because the liquid level after the 17th rehydration is H min (ie 150mm) and the sum of 17 times 10mm (ie H max ).

[0080] The electronic device 100 records all the rehydration volumes and usage time. As shown in Table 1, Δt is the time when the rehydration volume drops to H. minThe electronic device 100 calculates the amount of liquid replenishment and the corresponding annual liquid nitrogen usage according to the data in Table 1 as shown in Table 2. Further, the electronic device 100 draws a curve chart of the amount of liquid replenishment and Δt according to Table 1. Please refer to the graph for the relationship between the images. Figure 5 , Figure 5 The electronic device 100 draws a graph of the amount of liquid replenishment and the annual use of liquid nitrogen according to Table 2. For the relationship between the images, please refer to Figure 6 , Figure 6 A graph showing the amount of liquid replenishment and the annual usage of liquid nitrogen provided in the application examples.

[0081] Table 1

[0082] Fluid replacement volume (mm) 160 170 180 190 …… 270 280 290 300 310 320 Δt / day 27.5 29.8 32.1 34.7 …… 51.4 52.1 52.7 53.5 54.2 55.0

[0083] Table 2

[0084]

[0085] pass Figure 5 It can be seen that as the height of the fluid replenishment gradually increases, the liquid level drops to H min After the number of days Δt increases rapidly, it increases slowly. Analysis shows that when the amount of fluid replacement reaches a certain level, the change in the number of days Δt is not significant. Figure 6 It can be seen that there is a minimum annual usage of liquid nitrogen. At this time, the liquid replenishment height is about 240mm. That is, according to the replenishment plan of adding about 240mm of liquid nitrogen every time the minimum liquid level reaches 150mm, so that the liquid level reaches 390mm, the liquid nitrogen usage in a year is relatively small. Compared with other data, this type of liquid nitrogen tank can save about 400L a year, which can effectively reduce the annual usage of liquid nitrogen.

[0086] In one embodiment, the refill benchmark can be reduced from 10mm to 5mm. Theoretically, the line graph depicts a more detailed image. Refilling the liquid nitrogen tank again can yield another set of annual liquid nitrogen usage. This method can maximize annual liquid nitrogen savings and determine the standard liquid volume.

[0087] Please see Figure 4 , Figure 4 Schematic diagram of a module of a liquid volume determination device provided in an embodiment of the present application; the device 200 includes: a liquid level acquisition module 210, a liquid replenishment module 220, and a liquid replenishment volume determination module 230;

[0088] Liquid level acquisition module 210, for executing step 1: obtaining the H of the target container max and H of target storage sample min Among them, H max is the highest liquid level of the target container; H minWhen the target storage sample is stored in the target container, the lowest liquid level at which the target container meets the storage conditions for storing the target storage sample;

[0089] The rehydration module 220 is used to perform step 2: obtain the rehydration reference h, and adjust the liquid level of the target container from H to n times the rehydration reference h. min Rehydration to H min and the sum of n times h, up to H min The sum of n times h is greater than or equal to H max , and calculate the annual fluid usage C after each rehydration n ; Where n is a positive integer that increases from 1;

[0090] The fluid replenishment module 220 is further configured to execute step 3: update the fluid replenishment reference value h m , repeat step 2 and calculate the annual fluid usage C after each rehydration m ;

[0091] The fluid replenishment amount determination module 230 is used to execute step 4: n and C m The minimum value of H min The sum of the value of n times h is used as the standard liquid volume of the target container when storing the target storage sample.

[0092] Based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer program instructions. When the computer program instructions are read and executed by a processor, the steps in any of the above implementation methods are executed.

[0093] The computer-readable storage medium may be a random access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or any other medium capable of storing program code. The storage medium is used to store a program, and the processor executes the program upon receiving an execution instruction. The method executed by the electronic terminal defined by the process disclosed in any embodiment of the present invention may be applied to or implemented by the processor.

[0094] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0095] In addition, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0096] Furthermore, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0097] Alternatively, the present invention may be implemented in whole or in part through software, hardware, firmware, or any combination thereof. When implemented using software, the present invention may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part.

[0098] The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0099] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the elements.

[0100] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for determining liquid volume, characterized in that: The method comprises: Step 1: Get the H of the target container max and H of target storage sample min ; wherein, the H max is the highest liquid level of the target container; min When the target storage sample is stored in the target container, the target container satisfies the lowest liquid level of the storage condition for storing the target storage sample; Step 2: Obtain the rehydration reference h, and adjust the liquid level of the target container from H to n times the rehydration reference h. min Rehydration to H min and n times the sum of h, until the H min The sum of n times h is greater than or equal to H max , and calculate the annual fluid usage C after each rehydration n ; Where n is a positive integer that increases from 1; Step 3: Reduce the rehydration benchmark h and repeat step 2; Step 4: Set the H corresponding to the minimum value of all annual usage min The sum of the value of φ and n times h is used as the standard liquid volume of the target container when storing the target stored sample; when the target container needs to be replenished with liquid, the target container is replenished with the standard liquid volume.

2. The method according to claim 1, characterized in that The calculation of the annual liquid usage after each rehydration C n ,include: Get the liquid level height from the H min and the sum of n times h drops to the H min Time taken Δt m ; According to the formula: C n =S×(H min +n×h)×365 / Δt m Calculate the annual liquid usage C of the target container n ; Wherein, S is the cross-sectional area of ​​the target container.

3. The method according to claim 2, characterized in that The H of the target container is obtained max and H of target storage sample min ,include: Obtain the effective volume of the target container, and calculate the H based on the effective volume and S. max ; Monitoring the average temperature of the center height of the target storage sample; Determine whether the average temperature of the center height of the target storage sample is greater than or equal to the highest storage temperature T0 of the target storage sample; If the temperature average of the center height of the target storage sample is greater than or equal to the highest storage temperature T0 of the target storage sample, the liquid level height when the temperature average rises to T0 is obtained and used as the H value of the target storage sample. min .

4. The method according to claim 3, characterized in that The H is calculated based on the effective volume and S max ,include: Obtain the ratio of the effective volume to the S and use it as the H of the target container. max .

5. The method according to claim 3, characterized in that Obtaining the liquid level height at which the average temperature rises to T0 includes: When the temperature average value rises to T0, the capacitive liquid level sensor in the target container collects the corresponding capacitance value; The liquid level is calculated according to the capacitance value.

6. The method according to claim 4, characterized in that Monitoring the temperature average of the center height of the target storage sample includes: The resistance bridge in the target container monitors the resistance value from the center height of the target storage sample to the bottom of the container; The temperature average of the center height of the target storage sample is obtained according to the resistance value.

7. The method according to any one of claims 1 to 6, characterized in that The target container is a liquid nitrogen tank, and the liquid level is a liquid nitrogen level.

8. A fluid replenishing device, characterized in that: The fluid replenishment device includes: a liquid level acquisition module, a fluid replenishment module and a fluid replenishment amount determination module; The liquid level acquisition module is used to perform step 1: obtain the H of the target container max and H of target storage sample min ; wherein, the H max is the highest liquid level of the target container; min When the target storage sample is stored in the target container, the target container satisfies the lowest liquid level of the storage condition for storing the target storage sample; The rehydration module is used to perform step 2: obtain the rehydration reference h, and adjust the liquid level of the target container from H to n times the rehydration reference h. min Rehydration to H min and n times the sum of h, until the H min The sum of n times h is greater than or equal to H max , and calculate the annual fluid usage C after each rehydration n ; Where n is a positive integer that increases from 1; The fluid replenishment module is further configured to execute step 3: reducing the fluid replenishment benchmark h and repeating step 2; The replenishment volume determination module is used to execute step 4: H corresponding to the minimum value of all annual usage min The sum of the value of φ and n times h is used as the standard liquid volume of the target container when storing the target stored sample; when the target container needs to be replenished with liquid, the target container is replenished with the standard liquid volume.

9. An electronic device, characterized in that: The electronic device includes a memory and a processor, wherein program instructions are stored in the memory, and when the processor runs the program instructions, the steps of the method according to any one of claims 1 to 7 are executed.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the steps of the method according to any one of claims 1 to 7 are executed.

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