Simple conversion method and device for standard density of phosphate ester fire-resistant oil

Abstract

The application provides a simple conversion method and device for standard density of phosphate ester fire-resistant oil, which comprises the following steps: obtaining new phosphate ester fire-resistant oil of different types and fire-resistant oil running under different working conditions as fire-resistant oil samples, and obtaining the densities of the fire-resistant oil samples at different temperatures to obtain a relationship between the temperature and the density of the fire-resistant oil; measuring the density of the fire-resistant oil to be converted at a preset temperature by using a density sensor; and solving a first coefficient and a second coefficient at the preset temperature according to the densities of the fire-resistant oil samples at different temperatures and the density of the fire-resistant oil to be converted, wherein the preset temperature is higher than a standard temperature; and bringing the solved first coefficient and second coefficient into the relationship between the temperature and the density of the fire-resistant oil to convert the density of the phosphate ester fire-resistant oil at the standard temperature. The application can convert the density value of the phosphate ester fire-resistant oil at the standard temperature (20 DEG C), and fills the blank of the density data conversion of the phosphate ester fire-resistant oil.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum product density measurement, and particularly relates to a simple conversion method and device for standard density of phosphate ester fire-resistant oil. BACKGROUND

[0002] Density is an important index for evaluating the operation quality of phosphate ester fire-resistant oil in a speed regulation system for electric power, and the density of phosphate ester fire-resistant oil is greater than 1.13 g / cm 3 ~ 1.17 g / cm 3 The measurement of density can quickly determine whether the quality of new oil is uniform, and can also determine whether the oil supplement is correct. In a laboratory, a constant temperature water bath is usually used to measure the density of oil at 20 DEG C. In order to meet the needs of practical detection, it is important to realize online monitoring of density for timely response to oil quality. In order to make the collected density data have comparability, it is very important to obtain the density at 20 DEG C for quality evaluation and oil maintenance. At present, the density conversion of petroleum product hydrocarbon mixture mainly depends on the national standard GB / T 1885-1998 "Petroleum Measurement Table", which converts according to the volume expansion coefficient of different types of samples with temperature change. However, since the coefficient table only summarizes the tables of crude oil, product and lubricating oil with density less than 1 g / cm 3 , it does not involve the fire-resistant oil with density greater than 1 g / cm 3 , which is based on phosphate ester. Therefore, how to develop an oil liquid standard density online sensor for phosphate ester fire-resistant oil and provide a conversion method for standard density of phosphate ester fire-resistant oil is a problem to be solved at present. SUMMARY

[0003] The present application aims to solve at least one of the technical problems in the related art.

[0004] To this end, a first object of the present application is to provide a simple conversion method for standard density of phosphate ester fire-resistant oil, which solves the technical problems that the existing density conversion method does not involve phosphate ester fire-resistant oil and there is no oil liquid standard density online sensor for phosphate ester fire-resistant oil at present, provides a low-frequency tuning fork density sensor based on which the density of a wide range of liquid can be measured, which is suitable for online monitoring of the density of phosphate ester fire-resistant oil in a speed regulation system for electric power, and through the relationship function between the density of fire-resistant oil and temperature, the density value of phosphate ester fire-resistant oil at standard temperature (20 DEG C) can be converted, which fills the blank of density data conversion of phosphate ester fire-resistant oil.

[0005] A second object of the present application is to provide a simple conversion device for standard density of phosphate ester fire-resistant oil.

[0006] A third object of the present application is to provide a density sensor for phosphate ester fire-resistant oil.

[0007] A fourth object of the present application is to provide a computer device.

[0008] A fifth object of the present application is to provide a non-transitory computer readable storage medium.

[0009] To achieve the above objects, the first aspect of the present application provides a simple conversion method for standard density of phosphate ester fire-resistant oil, comprising: obtaining new oil of different types of phosphate ester fire-resistant oil and fire-resistant oil running under different working conditions as fire-resistant oil samples, and obtaining the densities of the fire-resistant oil samples at different temperatures; obtaining a relationship between fire-resistant oil temperature and density according to the densities of the fire-resistant oil samples at different temperatures, wherein the relationship between fire-resistant oil temperature and density includes a first coefficient and a second coefficient; measuring the density of the fire-resistant oil to be converted at a preset temperature by a density sensor, and solving the first coefficient and the second coefficient at the preset temperature according to the densities of the fire-resistant oil samples at different temperatures and the density of the fire-resistant oil to be converted, wherein the preset temperature is higher than the standard temperature; and substituting the solved first coefficient and second coefficient into the relationship between fire-resistant oil temperature and density to obtain the density of the phosphate ester fire-resistant oil at the standard temperature.

[0010] Optionally, in an embodiment of the present application, the relationship between fire-resistant oil temperature and density is obtained according to the densities of the fire-resistant oil samples at different temperatures, wherein the relationship between fire-resistant oil temperature and density includes a first coefficient and a second coefficient, which includes:

[0011] The relationship between fire-resistant oil temperature and density is obtained according to the densities of the fire-resistant oil samples at different temperatures by least square method to fit the relationship between temperature and density of each fire-resistant oil sample respectively, and the relationship between fire-resistant oil temperature and density is obtained according to the relationship between temperature and density of each fire-resistant oil sample, wherein the relationship between fire-resistant oil temperature and density includes a first coefficient and a second coefficient.

[0012] Optionally, in an embodiment of the present application, the relationship between fire-resistant oil temperature and density is expressed as:

[0013] ρ n =Ae Bt

[0014] wherein ρ n represents the density of the fire-resistant oil, A represents the first coefficient, B represents the second coefficient, and t represents the temperature.

[0015] Optionally, in an embodiment of the present application, the fire-resistant oil to be converted is the running fire-resistant oil, the density of the fire-resistant oil to be converted at a preset temperature is measured by a density sensor, and the first coefficient and the second coefficient at the preset temperature are solved according to the densities of the fire-resistant oil samples at different temperatures and the density of the fire-resistant oil to be converted, which includes:

[0016] According to the relationship between the temperature and the density of each anti-flaming oil sample and the density of each anti-flaming oil sample at the preset temperature, the first coefficient at the preset temperature and the linear relationship equation between the density of the anti-flaming oil sample and the first coefficient at the preset temperature are obtained.

[0017] The density of the anti-flaming oil to be converted at the preset temperature is measured by the density sensor, and the density of the anti-flaming oil to be converted at the preset temperature is substituted into the linear relationship equation between the density of the anti-flaming oil sample and the first coefficient at the preset temperature, so as to obtain the first coefficient at the preset temperature.

[0018] The first coefficient at the preset temperature, the density of the anti-flaming oil to be converted at the preset temperature and the preset temperature are substituted into the relationship between the temperature and the density of the anti-flaming oil, so as to obtain the second coefficient at the preset temperature.

[0019] Optionally, in an embodiment of the present application, the first coefficient and the second coefficient obtained by solving are substituted into the relationship between the temperature and the density of the anti-flaming oil, so as to obtain the density of the phosphate anti-flaming oil at the standard temperature, including:

[0020] The first coefficient and the second coefficient obtained by solving and the standard temperature are substituted into the relationship between the temperature and the density of the anti-flaming oil, so as to obtain the density of the phosphate anti-flaming oil at the standard temperature.

[0021] To achieve the above purpose, the second aspect of the present application provides a simple and easy conversion device for the standard density of phosphate anti-flaming oil, including:

[0022] The obtaining module is configured to obtain new oil and anti-flaming oil running under different working conditions of different types of phosphate anti-flaming oil as anti-flaming oil samples, and obtain the density of the anti-flaming oil samples at different temperatures.

[0023] The first calculation module is configured to obtain the relationship between the temperature and the density of the anti-flaming oil according to the density of the anti-flaming oil samples at different temperatures, wherein the relationship between the temperature and the density of the anti-flaming oil includes the first coefficient and the second coefficient.

[0024] The second calculation module is configured to measure the density of the anti-flaming oil to be converted at the preset temperature by the density sensor, and solve the first coefficient and the second coefficient at the preset temperature according to the density of the anti-flaming oil samples at different temperatures and the density of the anti-flaming oil to be converted, wherein the preset temperature is greater than the standard temperature.

[0025] The conversion module is configured to substitute the first coefficient and the second coefficient obtained by solving into the relationship between the temperature and the density of the anti-flaming oil, so as to obtain the density of the phosphate anti-flaming oil at the standard temperature.

[0026] To achieve the above object, the third aspect of the present application provides a phosphate ester fire-resistant oil density sensor, comprising a rectangular PZT plate, a metal shell and a quartz tuning fork, wherein a pair of electrodes are arranged on the rectangular PZT plate and the quartz tuning fork respectively, two electrodes of the pair of electrodes on the rectangular PZT plate are located on two sides of the rectangular PZT plate respectively, the rectangular PZT plate is connected to the quartz tuning fork through the metal shell, a driving voltage is input through the pair of electrodes on the rectangular PZT plate to apply a voltage to the rectangular PZT plate, the quartz tuning fork cantilever beam swings to generate an induced voltage, and the induced voltage is output through the pair of electrodes on the quartz tuning fork to obtain a resonance frequency according to the driving voltage frequency and the induced voltage.

[0027] Optionally, in an embodiment of the present application, the rectangular PZT has a size of 12 mm in length, 4 mm in width and 0.8 mm in height.

[0028] To achieve the above object, the fourth aspect of the present application provides a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the phosphate ester fire-resistant oil standard density simple conversion method described in the above embodiment when executing the computer program.

[0029] To achieve the above object, the fifth aspect of the present application provides a non-transitory computer readable storage medium, wherein the instructions in the storage medium can execute a phosphate ester fire-resistant oil standard density simple conversion method when executed by a processor.

[0030] The phosphate ester fire-resistant oil standard density simple conversion method, the phosphate ester fire-resistant oil standard density simple conversion device, the phosphate ester fire-resistant oil density sensor, the computer device and the non-transitory computer readable storage medium of the present application solve the technical problem that the existing density conversion method does not involve phosphate ester fire-resistant oil and there is no online sensor for oil standard density of phosphate ester fire-resistant oil at present, provide a low-frequency tuning fork density sensor based on which the liquid density in a large range can be measured, which is suitable for online monitoring of the phosphate ester fire-resistant oil density of the speed regulation system for electric power, and through the relationship function between the fire-resistant oil density and the temperature, the phosphate ester fire-resistant oil density value at the standard temperature (20℃) can be converted to fill the blank of the phosphate ester fire-resistant oil density data conversion.

[0031] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0033] Figure 1A flowchart of a simple conversion method of a standard density of phosphate ester fire-resistant oil provided in Embodiment One of the present application is shown in the figure.

[0034] Figure 2 A fitting example graph of the relationship between the coefficient of the fire-resistant oil sample formula and the density of the simple conversion method of the standard density of phosphate ester fire-resistant oil provided in Embodiment of the present application is shown in the figure.

[0035] Figure 3 A result diagram of a simple conversion device of a standard density of phosphate ester fire-resistant oil provided in Embodiment Two of the present application is shown in the figure.

[0036] Figure 4 A structure diagram of a density sensor of phosphate ester fire-resistant oil provided in Embodiment Three of the present application is shown in the figure. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0038] The simple conversion method and device of the standard density of phosphate ester fire-resistant oil of the embodiments of the present application are described below with reference to the accompanying drawings.

[0039] Figure 1 A flowchart of a simple conversion method of a standard density of phosphate ester fire-resistant oil provided in Embodiment One of the present application is shown in the figure.

[0040] As shown in the figure, the simple conversion method of the standard density of phosphate ester fire-resistant oil includes the following steps: Figure 1

[0041] Step 101, obtaining new oils of different kinds of phosphate ester fire-resistant oils and fire-resistant oils running under different working conditions as fire-resistant oil samples, and obtaining the densities of the fire-resistant oil samples at different temperatures;

[0042] Step 102, obtaining a relationship formula of the fire-resistant oil temperature and the density according to the densities of the fire-resistant oil samples at different temperatures, wherein the relationship formula of the fire-resistant oil temperature and the density includes a first coefficient and a second coefficient;

[0043] Step 103, measuring the density of the fire-resistant oil to be converted at a preset temperature by a density sensor, and solving the first coefficient and the second coefficient at the preset temperature according to the densities of the fire-resistant oil samples at different temperatures and the density of the fire-resistant oil to be converted, wherein the preset temperature is greater than the standard temperature;

[0044] ​Step 104, the first coefficient and the second coefficient obtained by solving are brought into the relationship between the fire-resistant oil temperature and the density to obtain the density of the phosphate ester fire-resistant oil at the standard temperature.

[0045] The simple conversion method for the standard density of the phosphate ester fire-resistant oil provided in the embodiment of the application obtains new oils of different types of phosphate ester fire-resistant oils and the fire-resistant oils running under different working conditions as fire-resistant oil samples and obtains the densities of the fire-resistant oil samples at different temperatures; the relationship between the fire-resistant oil temperature and the density is obtained according to the densities of the fire-resistant oil samples at different temperatures, wherein the relationship between the fire-resistant oil temperature and the density includes a first coefficient and a second coefficient; the density of the fire-resistant oil to be converted at a preset temperature is measured by a density sensor, the first coefficient and the second coefficient at the preset temperature are solved according to the densities of the fire-resistant oil samples at different temperatures and the density of the fire-resistant oil to be converted, wherein the preset temperature is greater than a standard temperature; the first coefficient and the second coefficient obtained by solving are brought into the relationship between the fire-resistant oil temperature and the density to obtain the density of the phosphate ester fire-resistant oil at the standard temperature. Thus, the technical problem that the existing density conversion method does not involve the phosphate ester fire-resistant oil and there is currently no online sensor for the oil standard density of the phosphate ester fire-resistant oil can be solved, a low-frequency tuning fork density sensor is provided, which can measure the density of a liquid in a large range, is suitable for the online monitoring of the density of the phosphate ester fire-resistant oil of the speed regulation system for electric power, and can obtain the density value of the phosphate ester fire-resistant oil at the standard temperature (20℃) through the relationship function between the fire-resistant oil density and the temperature, thereby filling the blank of the density data conversion of the phosphate ester fire-resistant oil.

[0046] The simple conversion method for the standard density provided in the application includes collecting the densities of new oils of different brands of phosphate ester fire-resistant oils and running oil samples collected under different working conditions at different temperatures, the temperature deviation is within ±0.1℃, and the relationship between the temperature and the density of the phosphate ester fire-resistant oil sample at different temperatures is found; the general relationship between the temperature and the density of the phosphate ester fire-resistant oil is further obtained through the relationship between the temperature and the density of different samples, and the density at the standard temperature (20℃) can be obtained through the general relationship and the density of the sample to be converted at any preset temperature, thereby filling the blank of the density data conversion of the phosphate ester fire-resistant oil.

[0047] The control of the temperature in the process of monitoring the fire-resistant oil has a great influence on the density detection result, and therefore the relationship between the temperature and the density is explored to obtain the density function at any temperature.

[0048] The new oils of different types of phosphate ester fire-resistant oils and the fire-resistant oils running under different working conditions are obtained as fire-resistant oil samples, and the densities of the fire-resistant oil samples at different temperatures are obtained through experiments.

[0049] In the method, the densities of the multiple anti-flaming oil samples at 15℃, 20℃, 30℃, 40℃, 50℃ and 60℃ are measured by the U-shaped oscillation tube method in the standard test method for density and relative density of liquids by a digital density meter (ASTM D4052-09), and the density data is shown in Table 1.

[0050]

[0051] Table 1

[0052] Further, in the embodiment of the present application, the relationship between the temperature and the density of the anti-flaming oil is obtained according to the densities of the anti-flaming oil samples at different temperatures, wherein the relationship between the temperature and the density of the anti-flaming oil includes a first coefficient and a second coefficient, and includes:

[0053] According to the densities of the anti-flaming oil samples at different temperatures, the relationship between the temperature and the density of each anti-flaming oil sample is fitted by the least square method, and the relationship between the temperature and the density of the anti-flaming oil is obtained according to the relationship between the temperature and the density of each anti-flaming oil sample, wherein the relationship between the temperature and the density of the anti-flaming oil includes a first coefficient and a second coefficient.

[0054] In the embodiment of the present application, the relationship between the temperature and the density of each group of anti-flaming oil samples is fitted by the least square method according to the densities of the anti-flaming oil samples at different temperatures in Table 1, and the relationship between the temperature and the density of each group of anti-flaming oil samples is as follows:

[0055] ρ1=1.1656e -0.00081t r 2 =0.996

[0056] ρ2=1.1665e -0.00073t r 2 =0.999

[0057] ρ3=1.1653e -0.00077t r 2 =0.999

[0058] ρ4=1.1521e -0.00074t r 2 =0.999

[0059] ρ5=1.1543e -0.00078t r 2 =0.999

[0060] ρ6=1.1729e -0.00078t r 2 =0.998

[0061] ρ7=1.1517e -0.00075t r 2 =0.998

[0062] Wherein, ρ1~ρ7 represent the densities of the sample No. 1~7, in unit of g / cm3. 3 , t is temperature, in unit of ℃, r 2 represents the determination coefficient.

[0063] In the embodiment of the present application, the relationship between the temperature and the density of the anti-flaming oil is obtained according to the relationship between the temperature and the density of each anti-flaming oil sample, and the relationship between the temperature and the density of the anti-flaming oil is expressed as:

[0064] ρ n =Ae Bt

[0065] Wherein, ρ n represents the density of the anti-flaming oil, A represents the first coefficient, B represents the second coefficient, and t represents the temperature.

[0066] As can be seen from the fitting formula of the anti-flaming oil sample, the relationship between the density and the temperature of different samples is slightly different, all conform to the function structure of the general relationship between the temperature and the density of the anti-flaming oil, and the change of the first coefficient A is related to the size of the density, that is, the oil liquid with larger density has larger coefficient multiplied by e, and the change of the second coefficient B is smaller.

[0067] Further, in the embodiment of the present application, the relationship between the temperature and the density of the anti-flaming oil is expressed as:

[0068] ρ n =Ae Bt

[0069] Wherein, ρ n represents the density of the anti-flaming oil, A represents the first coefficient, B represents the second coefficient, and t represents the temperature.

[0070] Further, in the embodiment of the present application, the anti-flaming oil to be converted is the anti-flaming oil in operation, the density of the anti-flaming oil to be converted at a preset temperature is measured by a density sensor, and the first coefficient and the second coefficient at the preset temperature are solved according to the density of the anti-flaming oil sample at different temperatures and the density of the anti-flaming oil to be converted, including:

[0071] The linear relationship equation of the first coefficient and the density of the anti-flaming oil sample at the preset temperature is obtained according to the relationship between the temperature and the density of each anti-flaming oil sample and the density of each anti-flaming oil sample at the preset temperature;

[0072] The density of the anti-flaming oil to be converted at the preset temperature is measured by the density sensor, and the density of the anti-flaming oil to be converted at the preset temperature is substituted into the linear relationship equation of the first coefficient and the density of the anti-flaming oil sample at the preset temperature to obtain the first coefficient at the preset temperature;

[0073] The first coefficient at the preset temperature, the density of the anti -ignition oil to be converted at the preset temperature and the preset temperature are substituted into the relationship between the temperature and the density of the anti -ignition oil, and the second coefficient at the preset temperature is obtained by solving.

[0074] In the embodiment of the application, the linear relationship equation of the first coefficient at the preset temperature and the density of the anti -ignition oil sample can be obtained according to the density of the anti -ignition oil sample at the preset temperature in Table 1 and the first coefficient in the fitting formula of the anti -ignition oil sample.

[0075] In the embodiment of the application, the density of the anti -ignition oil to be converted at the preset temperature is measured by the density sensor, and the density of the anti -ignition oil to be converted at the preset temperature is substituted into the linear relationship equation of the first coefficient at the preset temperature and the density of the anti -ignition oil sample, so as to obtain the first coefficient at the preset temperature.

[0076] The density sensor can be placed in the equipment, and the anti -ignition oil to be converted is allowed to run at the preset temperature, so as to measure the density of the anti -ignition oil to be converted at the preset temperature.

[0077] In the embodiment of the application, the first coefficient at the preset temperature, the density of the anti -ignition oil to be converted at the preset temperature and the preset temperature are substituted into the relationship between the temperature and the density of the anti -ignition oil, and the second coefficient at the preset temperature is obtained by solving.

[0078] In the embodiment of the application, the linear relationship equation of the first coefficient at the preset temperature and the density of the anti -ignition oil sample can be obtained first, and the linear relationship equation of the first coefficient at the preset temperature and the density of the anti -ignition oil sample is substituted into the relationship between the temperature and the density of the anti -ignition oil. When the density of the anti -ignition oil to be converted at the preset temperature is measured, the corresponding density-temperature curve can be obtained to obtain the corresponding second coefficient, so as to obtain the complete relationship between the temperature and the density of the anti -ignition oil.

[0079] Further, in the embodiment of the application, the first coefficient and the second coefficient obtained by solving are substituted into the relationship between the temperature and the density of the anti -ignition oil, and the density of the phosphate ester anti -ignition oil at the standard temperature is converted.

[0080] The first coefficient and the second coefficient obtained by solving and the standard temperature are substituted into the relationship between the temperature and the density of the anti -ignition oil, and the density of the phosphate ester anti -ignition oil at the standard temperature is obtained.

[0081] For example, in the embodiment of the application, the preset temperature can be 40℃, and the relationship between the density of the anti -ignition oil at 40℃ in Table 1 and the coefficient of the fitting formula of the anti -ignition oil sample is shown in the relationship graph as shown in Figure 2 Thus, the linear relationship equation of the first coefficient and the density of the anti -ignition oil sample at 40℃ can be obtained.

[0082] The density of the anti - ignition oil to be converted at 40 DEG C is measured by a density sensor, the linear relationship equation of the first coefficient and the density of the anti - ignition oil sample at 40 DEG C and the density of the anti - ignition oil to be converted at 40 DEG C are substituted into the relationship of the anti - ignition oil temperature and density, the relationship of the second coefficient is obtained, which is expressed as

[0083] Rho 40 =(1.1014rho 40 -0.0786)e Bt

[0084] Wherein, rho 40 is the density of the anti - ignition oil to be converted at 40 DEG C, unit g / cm 3 , t is 40 DEG C.

[0085] The second coefficient obtained by solving is substituted into the above formula, and the complete relationship of the anti - ignition oil temperature and density is obtained, and the anti - ignition oil density at 20 DEG C is obtained by substituting the temperature of 20 DEG C.

[0086] Wherein, the data and absolute error of the converted density and the measured density are shown in Table 2, and the absolute error between the converted density and the standard density at 20 DEG C measured in the laboratory is less than 0.01 g / cm 3 Therefore, the simple conversion method for the standard density of the phosphate anti - ignition oil can accurately convert the standard density of the phosphate anti - ignition oil. The application can be applied to the maintenance of the running anti - ignition oil according to the operation and maintenance guide of the anti - ignition oil DL / T571 phosphate anti - ignition oil for power plant. The calculation range of the application is suitable for the new oil of phosphate anti - ignition oil produced by Aksu, Shell and other manufacturers and the running oil collected under different working conditions.

[0087] Sample No. Observed density at 40°C Observed density at 20°C Calculated density at 20°C Absolute error 1 1.128 1.147 1.146 -0.001 2 1.132 1.150 1.150 0.000 3 1.130 1.145 1.148 0.003 4 1.129 1.148 1.147 -0.001 5 1.118 1.136 1.135 -0.001 6 1.118 1.137 1.135 -0.002 7 1.136 1.155 1.154 -0.001 8 1.118 1.135 1.135 0.000

[0088] Table 2

[0089] The application obtains the relationship function of the density of the anti - ignition oil and a certain temperature through test exploration and calculation, so that the technical scheme of the application has the density value at the standard temperature (20 DEG C) which can be obtained by conversion, and the absolute error between the density obtained by conversion and the standard density at 20 DEG C measured in the laboratory is less than 0.01 g / cm3, which has certain accuracy.

[0090] Figure 3 It is a result schematic view of a simple conversion device for the standard density of the phosphate anti - ignition oil provided in the second embodiment of the application.

[0091] As Figure 3 shown, the simple conversion device for the standard density of the phosphate anti - ignition oil comprises:

[0092] The acquisition module 10 is configured to acquire new oils of different kinds of phosphate ester fire-resistant oils and fire-resistant oils running under different working conditions as fire-resistant oil samples, and acquire densities of the fire-resistant oil samples at different temperatures;

[0093] The first calculation module 20 is configured to obtain a relationship between fire-resistant oil temperature and density according to the densities of the fire-resistant oil samples at different temperatures, wherein the relationship between fire-resistant oil temperature and density comprises a first coefficient and a second coefficient;

[0094] The second calculation module 30 is configured to measure a to-be-converted fire-resistant oil density at a preset temperature by using the density sensor, and solve the first coefficient and the second coefficient at the preset temperature according to the densities of the fire-resistant oil samples at different temperatures and the to-be-converted fire-resistant oil density, wherein the preset temperature is greater than the standard temperature.

[0095] The conversion module 40 is configured to convert the first coefficient and the second coefficient obtained by solving into the relationship between fire-resistant oil temperature and density, and convert to obtain the phosphate ester fire-resistant oil density at the standard temperature.

[0096] The phosphate ester fire-resistant oil standard density simple conversion device provided by the embodiment of the application comprises an acquisition module, a first calculation module, a second calculation module and a conversion module. The acquisition module is configured to acquire new oils of different kinds of phosphate ester fire-resistant oils and fire-resistant oils running under different working conditions as fire-resistant oil samples, and acquire densities of the fire-resistant oil samples at different temperatures. The first calculation module is configured to obtain a relationship between fire-resistant oil temperature and density according to the densities of the fire-resistant oil samples at different temperatures, wherein the relationship between fire-resistant oil temperature and density comprises a first coefficient and a second coefficient. The second calculation module is configured to measure a to-be-converted fire-resistant oil density at a preset temperature by using the density sensor, and solve the first coefficient and the second coefficient at the preset temperature according to the densities of the fire-resistant oil samples at different temperatures and the to-be-converted fire-resistant oil density, wherein the preset temperature is greater than the standard temperature. The conversion module is configured to convert the first coefficient and the second coefficient obtained by solving into the relationship between fire-resistant oil temperature and density, and convert to obtain the phosphate ester fire-resistant oil density at the standard temperature. Thus, the technical problem that the existing density conversion method does not involve phosphate ester fire-resistant oil and there is currently no online sensor for oil standard density of phosphate ester fire-resistant oil can be solved. A low-frequency tuning fork density sensor is provided, which can measure the density of a liquid in a large range, is suitable for online monitoring of the phosphate ester fire-resistant oil density of a speed regulation system for electric power, and can convert to obtain the phosphate ester fire-resistant oil density value at the standard temperature (20 DEG C) through the relationship function between fire-resistant oil density and temperature, thereby filling the blank of the phosphate ester fire-resistant oil density data conversion.

[0097] Figure 4 FIG. 3 is a structural schematic diagram of a phosphate ester fire-resistant oil density sensor provided in the embodiment three of the application.

[0098] As Figure 4As shown, the phosphate fire-resistant oil density sensor comprises a rectangular PZT plate, a metal shell and a quartz tuning fork, wherein a pair of electrodes are arranged on the rectangular PZT plate and the quartz tuning fork respectively, two electrodes of the pair of electrodes on the rectangular PZT plate are located on two sides of the rectangular PZT plate respectively, the rectangular PZT plate is connected to the quartz tuning fork through the metal shell, a driving voltage is input through the pair of electrodes on the rectangular PZT plate to apply a voltage to the rectangular PZT plate, the quartz tuning fork cantilever beam swings to generate an induced voltage, and the induced voltage is output through the pair of electrodes on the quartz tuning fork to obtain a resonance frequency according to the driving voltage frequency and the induced voltage.

[0099] The phosphate fire-resistant oil density sensor of the embodiment of the present application comprises a rectangular PZT plate, a metal shell and a quartz tuning fork, wherein a pair of electrodes are arranged on the rectangular PZT plate and the quartz tuning fork respectively, two electrodes of the pair of electrodes on the rectangular PZT plate are located on two sides of the rectangular PZT plate respectively, the rectangular PZT plate is connected to the quartz tuning fork through the metal shell, a driving voltage is input through the pair of electrodes on the rectangular PZT plate to apply a voltage to the rectangular PZT plate, the quartz tuning fork cantilever beam swings to generate an induced voltage, and the induced voltage is output through the pair of electrodes on the quartz tuning fork to obtain a resonance frequency according to the driving voltage frequency and the induced voltage. Thus, the technical problem that the existing density conversion method does not involve phosphate fire-resistant oil and there is currently no online sensor for the standard density of phosphate fire-resistant oil can be solved, a low-frequency tuning fork density sensor is provided, which can measure the density of a wide range of liquids, is suitable for online monitoring of the density of phosphate fire-resistant oil for a speed regulation system for electric power, and can convert the density of phosphate fire-resistant oil at a standard temperature (20℃) through a relationship function between the density of fire-resistant oil and temperature, thereby filling the blank of the conversion of phosphate fire-resistant oil density data.

[0100] Further, in the embodiment of the present application, the rectangular PZT has a size of 12mm in length, 4mm in width and 0.8mm in height.

[0101] Since the PZT plate will have a nonlinear characteristic after long-term operation, not only the output accuracy of the system is affected, but also the stability of the system is affected. As known from the hysteresis nonlinear physical model, the size of the PZT plate is related to the piezoelectric strain coefficient. Therefore, the rectangular PZT of the present application is designed to have a size of 12mm in length, 4mm in width and 0.8mm in height. This length-width ratio can better reduce the deformation and surface polarization charge to reduce the hysteresis effect and improve the measurement accuracy.

[0102] The density sensor of the embodiment of the present application is based on the principle of low frequency tuning fork vibration string, and is composed of a PZT (lead zirconate titanate piezoelectric ceramic) rectangular plate as a piezoelectric excitation driver and a quartz tuning fork placed on the top of the PZT as a sensor for resonance frequency detection. When the excitation frequency of the PZT actuator is scanned around the resonance frequency of the tuning fork, the resonance frequency is determined by the sensing voltage generated in the tuning fork, and the result of the liquid density is extracted from the resonance frequency.

[0103] The present application uses a quartz crystal to make a tuning fork, and a metal film electrode is arranged on the surface of the crystal by electroplating. By designing the structure size of the tuning fork, frequency resonance can be achieved by voltage excitation, and in the low frequency (kHz level) resonance region, very stable resonance frequency can be achieved. By increasing the driving voltage, a higher signal-to-noise ratio can be obtained. Equation (1) represents the relationship between the liquid density, viscosity and cantilever beam structure affecting the resonance frequency f0 when the quartz tuning fork vibrates in the liquid

[0104]

[0105] wherein f vac is the resonance frequency in vacuum, f0 is the resonance frequency in liquid, p q is the density of quartz electrode, p L is the density of liquid, L is the length of cantilever beam, W is the width of cantilever beam, T is the thickness of cantilever beam, and m L is the liquid viscosity coefficient, is the geometric function of the height-width ratio of the rectangular cantilever beam.

[0106] The last term is due to the reaction force from the fluid, and the relevant literature is 0.631, which is the basic vibration model parameter of the cantilever beam, and when

[0107] The density sensor of the present application is used for density monitoring, which has speciality. Since the viscosity of phosphate ester fire-resistant oil of the same brand and same grade does not change greatly, it is generally around 50 mpa·s, i.e. 50×10 -3 kg / (m·s), and the density of fire-resistant oil is generally greater than 1.1×10 3 kg / m 3 Therefore, the second term of the formula will be much smaller than the third term The second term is temporarily ignored, so the formula (1) is written as the following formula (2)

[0108]

[0109] wherein

[0110] ​

[0111] K is a constant, which is only related to the inherent characteristics (density and size) of the tuning fork.

[0112] As shown in Figure 4 The density sensor developed for density detection is a four-electrode device, which consists of two parts: a rectangular PZT plate as a driver and a quartz tuning fork as a detection sensor, wherein the electrodes on the rectangular PZT plate are double-sided electrodes, one electrode c is located on one side of the rectangular PZT plate, and the other electrode d is located on the other side of the rectangular PZT plate. The standard frequency f vac is 32,768±0.1Hz, and the quartz tuning fork is adhered to the PZT actuator through a metal shell. The metal shell is isolated from the quartz crystal, and such bonding does not affect the resonance characteristics of the tuning fork.

[0113] In operation, the input driving voltage, referred to as the excitation voltage, is applied to the PZT through electrodes c and d, and the sensing signal is output through electrode pair a and b. When an alternating driving voltage with a frequency close to the resonance frequency of the PZT actuator is applied, the tuning fork expands in the thickness direction mode, and at the same time, the tuning fork cantilever beam swings. Due to the piezoelectric effect, a voltage V is generated in the tuning fork, which is proportional to the oscillation amplitude of the arm. The induced voltage V can be output and detected through electrode pair a and b. By scanning the driving frequency f and recording the corresponding induced voltage V, the relationship between the frequency (f) and the output voltage (V) can be obtained, which can also be regarded as the vibration spectrum of the tuning fork in the liquid. Under the resonance condition, the displacement of the tuning fork cantilever beam is maximum, corresponding to the maximum amplitude or peak amplitude of the output voltage in the f-V curve, so the resonance frequency can be determined.

[0114] The application provides a low-frequency tuning fork density sensor, which can measure the density of a wide range of liquids and is suitable for online monitoring of the density of phosphate ester fire-resistant oil in a speed regulation system for power.

[0115] In order to realize the above-mentioned embodiments, the application further provides a computer device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to realize the simple conversion method of the standard density of phosphate ester fire-resistant oil.

[0116] In order to realize the above-mentioned embodiments, the application further provides a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the simple conversion method of the standard density of phosphate ester fire-resistant oil.

[0117] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the usage of the terms "first", "second" or "third" does not limit the quantity or order of the specific features, structures, materials or characteristics, but rather the term "first", "second" or "third" can be used to distinguish the specific features, structures, materials or characteristics from one another. In addition, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples, without changing the scope of the application.

[0118] Furthermore, the terms "first", "second", or the like merely denote different instances of a similar feature, structure, material, or characteristic, without necessarily implying any actual relationship or order between the different instances of the feature, structure, material, or characteristic. As such, the terms "first", "second", or the like can be used to distinguish the different instances of the feature, structure, material, or characteristic from one another, but are not otherwise limiting upon the scope of the application. The terms "plurality" and "a plurality" contain the meaning of "multiple" or "two or more" unless otherwise indicated by the context.

[0119] Any process or method descriptions or blocks in flow charts or otherwise described herein represent embodiments of modules, segments, or portions of code which include one or more executable instructions for implementing specific logic functions or steps, and alternate implementations are possible. In some embodiments, the processes or methods described in flow charts or otherwise described herein can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the processes or methods described in flow charts or otherwise described herein can be stored as one or more sequences of instructions or code on a non-transitory computer-readable medium such as any memory or storage device comprising a computer-readable medium. Some embodiments can therefore include a computer program product comprising a computer-readable medium having stored thereon one or more sequences of instructions derived from the processes or methods described herein. Further, it should be appreciated that where possible the functions, steps, and / or actions of the preferred embodiments can be performed in one or more orders unless otherwise specifically limited by certain embodiments. Therefore, any process or method descriptions or blocks in flow charts or otherwise described herein can be interpreted either way, in accordance with one or more embodiments.

[0120] The logic and / or steps represented in the flowcharts and / or described herein, for example, can be considered as a sequence of executable instructions stored in a computer readable medium, which can be executed by an instruction execution system, apparatus or device, such as a computer-based system, a processor-based system, or other system that can fetch the instructions from the instruction execution system, apparatus or device and execute the instructions, or a combination thereof. For the purposes of this specification, a "computer readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus or device. The computer readable medium can specifically be, but is not limited to, the following: an electronic connection (electronic apparatus) having one or more wires, a portable computer diskette (magnetic apparatus), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disk read-only memory (CDROM). In addition, the computer readable medium can even be paper or other suitable medium upon which the program can be printed, because the program can be electronically obtained, for example, by optically scanning the paper or other medium, then

[0121] It should be understood that portions of the application can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As such, if implemented in hardware, and in another embodiment, any of the following technologies, known in the art, or a combination thereof, can be used: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0122] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiment methods can be completed by programs instructing relevant hardware, and the programs can be stored in a computer readable storage medium. When the programs are executed, one or a combination of the steps of the method embodiments is included.

[0123] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software functional module. When the integrated module is realized in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0124] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A simplified method for converting the standard density of phosphate ester fire-resistant oil, characterized in that, include: New oils of different types of phosphate ester fire-resistant oil and fire-resistant oils operating under different conditions were obtained as fire-resistant oil samples, and the density of the fire-resistant oil samples at different temperatures was obtained. Based on the density of the fire-resistant oil samples at different temperatures, a relationship between the temperature and density of the fire-resistant oil is obtained. This relationship includes a first coefficient and a second coefficient. The process involves: using the least squares method to fit the temperature and density relationship of each fire-resistant oil sample based on its density at different temperatures; and then, based on the temperature and density relationship of each fire-resistant oil sample, obtaining the final relationship between the temperature and density of the fire-resistant oil. This final relationship includes a first coefficient and a second coefficient. The density of the fire-resistant oil to be converted at a preset temperature is measured using a density sensor. Based on the density of the fire-resistant oil sample at different temperatures and the density of the fire-resistant oil to be converted, a first coefficient and a second coefficient at the preset temperature are calculated. The preset temperature is greater than a standard temperature, and the fire-resistant oil to be converted is a fire-resistant oil in operation. The calculation includes: obtaining a linear relationship equation between the first coefficient and the density of the fire-resistant oil sample at the preset temperature based on the relationship between the temperature and density of each fire-resistant oil sample and the density of each fire-resistant oil sample at the preset temperature; measuring the density of the fire-resistant oil to be converted at the preset temperature using a density sensor, and substituting the density of the fire-resistant oil to be converted at the preset temperature into the linear relationship equation between the first coefficient and the density of the fire-resistant oil sample at the preset temperature to obtain the first coefficient at the preset temperature; and substituting the first coefficient at the preset temperature, the density of the fire-resistant oil to be converted at the preset temperature, and the preset temperature into the relationship equation between the temperature and density of the fire-resistant oil to obtain the second coefficient at the preset temperature. Substituting the first and second coefficients obtained from the solution into the relationship between the temperature and density of the fire-resistant oil, the density of the phosphate ester fire-resistant oil at the standard temperature is calculated.

2. The method as described in claim 1, characterized in that, The relationship between the temperature and density of the fire-resistant oil is expressed as follows: ρ n =Ae Bt Where, ρ n Let A represent the density of the fire-resistant oil, B represent the first coefficient, and t represent the temperature.

3. The method as described in claim 1, characterized in that, The step of substituting the first and second coefficients obtained from the solution into the relationship between the temperature and density of the fire-resistant oil to calculate the density of the phosphate ester fire-resistant oil at standard temperature includes: Substituting the first and second coefficients obtained from the solution, along with the standard temperature, into the relationship between the temperature and density of the fire-resistant oil, we obtain the density of the phosphate ester fire-resistant oil at the standard temperature.

4. A simple conversion device for standard density of phosphate ester fire-resistant oil, characterized in that, include: The acquisition module is used to acquire new oil of different types of phosphate ester fire-resistant oil and fire-resistant oil operating under different working conditions as fire-resistant oil samples, and to acquire the density of the fire-resistant oil samples at different temperatures; The first calculation module is used to obtain the relationship between the temperature and density of the fire-resistant oil sample based on the density of the fire-resistant oil sample at different temperatures. The relationship between the temperature and density of the fire-resistant oil sample includes a first coefficient and a second coefficient. The module includes: fitting the relationship between the temperature and density of each fire-resistant oil sample using the least squares method based on the density of the fire-resistant oil sample at different temperatures, and obtaining the relationship between the temperature and density of the fire-resistant oil sample based on the relationship between the temperature and density of each fire-resistant oil sample. The relationship between the temperature and density of the fire-resistant oil sample includes a first coefficient and a second coefficient. The second calculation module is used to measure the density of the fire-resistant oil to be converted at a preset temperature using a density sensor, and to solve for a first coefficient and a second coefficient at the preset temperature based on the density of the fire-resistant oil sample at different temperatures and the density of the fire-resistant oil to be converted. The preset temperature is greater than the standard temperature, and the fire-resistant oil to be converted is a fire-resistant oil in operation. The module includes: obtaining a linear relationship equation between the first coefficient and the density of the fire-resistant oil sample at the preset temperature based on the relationship between the temperature and density of each fire-resistant oil sample and the density of each fire-resistant oil sample at the preset temperature; measuring the density of the fire-resistant oil to be converted at the preset temperature using a density sensor, and substituting the density of the fire-resistant oil to be converted at the preset temperature into the linear relationship equation between the first coefficient and the density of the fire-resistant oil sample at the preset temperature to obtain the first coefficient at the preset temperature; and substituting the first coefficient at the preset temperature, the density of the fire-resistant oil to be converted at the preset temperature, and the preset temperature into the relationship equation between the temperature and density of the fire-resistant oil to obtain the second coefficient at the preset temperature. The conversion module is used to substitute the first and second coefficients obtained from the solution into the relationship between the temperature and density of the fire-resistant oil to calculate the density of the phosphate ester fire-resistant oil at the standard temperature.

5. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the method as described in any one of claims 1-3.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-3.

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