16 results about "Bubble point" patented technology

The application belongs to the technical field of detection, and discloses a sintering screen integrity detection method and system; the method comprises the following steps: installing a measured sintering screen into a test tank body, and injecting a test liquid into a liquid cavity; gradually increasing the air pressure of an air cavity; after increasing the air pressure once, maintaining the pressure for a preset time, and then collecting an overall image of the liquid cavity; a host computer obtains the positions of multiple bubble points according to the overall image, determines the air pressure when each bubble point starts to bubble, and controls an image module to collect local microscopic images of each bubble point; the host computer calculates the first aperture of each bubble point according to the air pressure when each bubble point starts to bubble, obtains the second aperture of each bubble point according to the local microscopic images of each bubble point, and calculates the effective aperture of each bubble point according to the first aperture and the second aperture; the host computer judges whether the aperture of the measured sintering screen is qualified according to the effective aperture of each bubble point; thereby, the degree of automation is high, the detection efficiency is high, and the accuracy of the detection result is improved.

The invention discloses a method for purifying dimethyl oxalate, which comprises the following steps: 1) introducing crude dimethyl oxalate into a pre-separation tower to remove light components in the crude dimethyl oxalate; 2) introducing the tower kettle material obtained in the step 1) into a purification-vaporization tower at a temperature close to a bubble point; the purification-vaporization tower comprises a tower body, the tower body is filled with a tower plate or filler, a tower kettle of the tower body is provided with a reboiler (2), and a feeding end of the purification-vaporization tower is positioned in the middle of the tower body; 3) adjusting the vaporization rate of the material in the tower to 90-98%, and obtaining a high-purity gas-phase DMO product from the tower top of the purification-vaporization tower; and discharging the kettle liquid rich in heavy components from the bottom of the tower. According to the invention, purification and vaporization functions are integrated in the purification-vaporization tower, the system is simple, control variables are few, long-period stable operation is easy to realize, and the instability of operation of a traditional rectification tower under an extremely small reflux ratio is avoided.

The invention discloses a combined device and method for measuring the surface resistance and bubble point of an alkaline hydrogen production diaphragm. Comprising an end plate assembly with a transparent observation window, a first electrolyte containing cavity and a second electrolyte containing cavity which are located on the two sides of a diaphragm respectively, a diaphragm fixing plate used for clamping the diaphragm and limiting the effective testing area, an electrode plate with a hole in the center, a multi-layer sealing gasket and a fastening assembly, and is provided with a liquid injection / drainage interface, a liquid drainage interface and an air inlet interface. According to the testing method of the device, under the condition that the clamping and pressing states of the diaphragm are not changed, the surface resistance of the diaphragm can be measured in a set atmosphere / bubble-containing electrolyte environment, and then bubble point pressure testing is achieved by emptying the containing cavity on one side and maintaining wetting liquid covering on the other side. And the transparent observation window is used for observing the infiltration state of the diaphragm and the bubble generation and attachment behaviors in real time, so that the accuracy of judging the area resistance and the bubble point is improved, and a consistent microscopic state basis is provided for establishing the association between the bubble point and the area resistance.

The application discloses a kind of R407C refrigerant leakage detection methods for vehicle air conditioning unit, directly utilize the characteristics of fast response of pressure signal, little influence of refrigerant because of the composition change caused by refrigeration system leakage, by comparing the pressure difference between the two refrigeration systems of double refrigeration system passenger room air conditioning unit and the absolute value of the pressure of single system, combined with outdoor environment temperature partition, three layers of logic, logic 1, logic 2 and logic 3 are designed, which correspond to different leakage severity and operation mode respectively.All logic uses "three times alarm confirmation" mechanism to avoid false alarm caused by transient disturbance.The R407C refrigerant leakage detection method for vehicle air conditioning unit of the application adopts a new type of refrigerant leakage detection logic based on pressure detection, completely avoids the influence of boiling point drift between bubble point and dew point of R407C refrigerant, the nature of leakage detection does not change, and the speed of refrigerant leakage detection feedback is also faster, more accurate and more accurate.

The application provides a shale fluid phase change feature evaluation method and device, electronic equipment and a storage medium. A corresponding multi-scale pore model is established by obtaining pore size distribution parameters in a shale pore system, the composition of the fluid in each pore is obtained, and the initial dew point temperature and / or bubble point temperature can be determined by the initial physical property parameters corresponding to each composition. The balance physical property parameters in the corresponding pore balance state are determined, and the effective pore size of each pore is determined. The actual dew point temperature and / or bubble point temperature is obtained, and the phase change feature of the shale pore system is determined. The actual dew point temperature and / or actual bubble point temperature distribution of the system can be accurately obtained, the influence of the pore size distribution on the phase change feature is analyzed, and the accuracy of the specific pore phase change feature evaluation in the shale fluid system is improved.

The utility model belongs to the technical field of aviation test devices, and discloses a movable filter element bubble point test device. By means of the traditional mechanical design, 360-degree rotation of the filter element is achieved, meanwhile, multi-model filter element tests of an airplane are achieved through the replaceable airtight connector, and the device is a movable filter element bubble point test device, improves work efficiency and reduces work difficulty. The oil filter cleaning device is simple and practical in structure, has very high practicability, rapidness, accuracy and safety, is mainly applied to oil filter cleaning of certain aircraft types, and is connected with a ground joint at the bottom of an engine compartment before a decomposition part of the engine compartment of each aircraft is started; and residual hydraulic oil in the cabin is discharged without turning over the oil filter device, so that the working efficiency is enhanced, the working difficulty is reduced, and the oil filter device has been applied to an airplane electromechanical workshop.

A kind of diaphragm bubble point test device and method for simulating alkaline electrolysis working condition, including the first component (1) and the second component (2) located at the two sides of the diaphragm to be measured, sealing gasket (6) is arranged between the two, and the diaphragm to be measured is clamped to form first cavity (12) and second cavity (21);First cavity is provided with observation / liquid injection opening, second cavity is provided with air inlet assembly (22), liquid discharge assembly (23) and pressure detection assembly (24);First polar plate (13) and second polar plate (25) are respectively arranged in first cavity and second cavity and are connected with external power supply, for electrolysis treatment to diaphragm;When the device tests, first electrolyte is injected into two cavities, electrolysis is carried out under set current density or voltage, after electrolysis, external power supply is turned off and electrolyte in second cavity is emptied, then gas is introduced into second cavity to gradually pressurize, bubble condition is observed through first cavity side and corresponding pressure is read, that is, diaphragm bubble point pressure.

The application discloses a design method of a shell-boiling tube-condensing wound tube heat exchanger, according to the inlet and outlet temperatures of the tube and the shell, the dew point and bubble point of the working medium of the tube and the shell, the whole heat exchanger is divided into three parts, i.e. a tube-condensing shell-liquid section, a tube-condensing shell-boiling section and a tube-condensing shell-gas section, and the heat exchange capacity, the surface heat exchange coefficient of the tube and the shell, the comprehensive heat exchange coefficient, the pressure drop of the tube and the shell, the heat exchange area and the axial effective heat exchange length of the three parts of the wound tube heat exchanger are respectively designed and calculated; the tube is always in a gas-liquid mixed phase state of condensation phase change, the surface heat exchange coefficients of the tube and the shell are related to the dryness, therefore, the three parts of the wound tube heat exchanger are designed and calculated by using the finite volume method. The design method of the shell-boiling tube-condensing wound tube heat exchanger has the characteristics of high calculation precision, complete design method and high calculation efficiency, and has high commercial value and market promotion value.

The utility model relates to the technical field of bubbling point testing devices, in particular to a multichannel parallel bubbling point testing device which provides a place through a testing container, is sealed through a sealing device, is conducted through a communicating device, is bubbled through a bubbling device and is tested through a measuring device. The test container and the communication device are supported through the containing device, and the temperature and humidity in the test container are monitored through the monitoring device; comprising a test body; the device comprises a testing machine body and further comprises a testing container, a sealing device, a communicating device, a foaming device, a measuring device, a containing device and a monitoring device, the testing container, the communicating device, the foaming device and the containing device are all installed on the testing machine body, the sealing device is installed on the communicating device, the measuring device is installed on the foaming device, and the monitoring device is installed on the testing container.

The invention discloses a method, a system, a device and equipment for testing integrity of an exhaust filter, which are characterized in that under the condition that compressed air is communicated to the exhaust filter, an inlet pressure value and an outlet pressure change value of the exhaust filter are acquired in real time, and the integrity of a filter membrane is evaluated by integrating the inlet pressure value and the outlet pressure value. Due to the fact that the exhaust filter is provided with the exhaust hole, under the ideal condition, if the filter membrane is complete, the outlet pressure change value should be zero, but a threshold value is set for the outlet pressure change value by considering the influences of the compressed air flow speed, the pressure sensor sensitivity and the like. If the inlet pressure value exceeds a standard bubble point value provided by a manufacturer and used for detection, and the outlet pressure change value still does not exceed a set threshold value, it is indicated that the filter membrane passes the integrity test. By adopting the scheme of the invention, the complexity of the completion test of the exhaust filter can be greatly reduced, and meanwhile, the accuracy of the test result can be ensured.

The invention provides a bubble point pressure measuring method and device and a pump control system, and belongs to the technical field of petroleum and natural gas exploration and development. The method comprises the following steps: pumping a drilling fluid into a pipeline of a downhole tool, and recording an initial induced voltage value generated by reflection of current fluid to light in the pipeline by using a first part comprising a graduated optical fiber probe; after the downhole tool is set, the formation fluid of the target depth in the current borehole is pumped at the gradually-increased pump speed, a pipeline pressure change curve is recorded, and the waveform of the induced voltage value generated by reflection of the current fluid to light in the pipeline along with time is recorded through the first component; and determining the moment of induced voltage value change caused by fluid phase state change from the waveform, and determining bubble point pressure according to the pipeline pressure value corresponding to the moment in the pipeline pressure change curve. Through combination of a fluid phase change curve and a pipeline pressure change curve detected by the optical fiber probe, rapid and accurate measurement of formation fluid bubble point pressure is realized.

The invention discloses a method for improving the test accuracy of an automatic detection device for the aperture of a membrane element, and the device comprises a programmable logic controller, various sensors, an electric proportional valve, a human-computer interface and the like. The device is mainly characterized in that the accuracy of test data such as the maximum bubbling pore diameter, the average pore diameter and the relative air permeability coefficient is improved by additionally arranging a miniature gas buffer tank in the device and changing the pressurization step length of an electric proportional valve. Through the operation and arrangement, the influence of air inlet pressure fluctuation on the stability of the test process and the reliability of results can be effectively reduced, and the situation that the test results of key parameters such as the maximum aperture, the average aperture and the aperture distribution are deviated due to the fact that a flow-pressure curve is distorted due to interference on bubble points is avoided; therefore, the test accuracy and repeatability of the detection device are improved.

The embodiment of the application discloses a kind of mixed working medium heat pump systems and control method, in mixed working medium heat pump system, the first pressure of mixed working medium that compressor exports is detected by first pressure sensor, the second pressure of mixed working medium that evaporator exports is detected by second pressure sensor, the opening of first expansion valve is controlled according to the first pressure and the dew point pressure of mixed working medium by controller, and the opening of second expansion valve is controlled according to the second pressure and the bubble point pressure of mixed working medium, since first expansion valve is set after condenser, second expansion valve is set before evaporator, can be adjusted by the opening of first expansion valve Condensation pressure of condenser is equal to dew point pressure, the evaporation pressure of evaporator is adjusted by the opening of second expansion valve equal to bubble point pressure, so that condensation pressure and evaporation pressure reach ideal state simultaneously, mixed working medium is completely liquefied in condenser, completely gasified in evaporator, so that heat pump system reaches optimal performance state.

The invention discloses a microporous membrane testing tool and system and a bubble point pressure and permeable rate measuring method thereof.The microporous membrane testing tool comprises an upper assembly and a bottom cover, the bottom of the upper assembly is open, and a gas inlet, a liquid inlet and a liquid outlet are formed in the upper assembly; a first liquid outlet and a second liquid outlet are formed in the bottom cover, the bottom cover is detachably connected with the opening to seal the opening, and a liquid storage chamber is defined by the bottom cover and the upper assembly; the microporous membrane testing system comprises a gas supply unit, a liquid supply unit, a measuring device and a microporous membrane testing tool, wherein the gas supply unit comprises a gas source, a pressure control valve and a first valve; the liquid supply unit comprises a liquid tank, a liquid pump, a second valve, a third valve and a fourth valve; the measuring device is communicated with the second liquid outlet. The microporous membrane testing system provided by the invention can measure the bubble point pressure and the water permeability of the microporous membrane, realizes measurement of main performance parameters of the microporous membrane through one set of equipment, and has richer functions.

A method of operating a thermal management system associated with a turbine engine includes circulating a pericritical fluid through a cooling circuit; generating a sensor output using a phase detection sensor in fluid communication with the pericritical fluid, the sensor output including an impedance value; determining that the pericritical fluid has reached a bubble point based at least on a first characteristic change in the impedance value; determining that the pericritical fluid has reached a dew point based at least on a second characteristic change in the impedance value, the second characteristic change being different from the first characteristic change; and controlling at least one controllable component of the thermal management system based at least on the bubble point and the dew point.

The utility model discloses a device for manually testing water pressure resistance and bubble point, which relates to the technical field of test equipment and comprises a first pipe body, a hoop, a second pipe body, a three-way connecting block and an exhaust valve core. The end, opposite to the first pipe body, of the second pipe body communicates with the three-way connecting block, the three-way connecting block is hollow, a cavity communicating with the second pipe body is formed, a first connector of the three-way connecting block communicates with a pressure storage tank through a first quick connector, and a second connector of the three-way connecting block communicates with a second pipe body through a second quick connector. A second connector of the three-way connecting block is connected with a pressure difference transmitter through a second quick connector, a fourth connector of the three-way connecting block is communicated with the exhaust valve element, and the second pipe body and the first pipe body are fixed through the hoop. And the water pressure resistance or bubble point of the diaphragm is tested by placing the diaphragm between the second pipe body and the first pipe body. The diaphragm integrity testing device is low in cost and simple to operate and clean, and can solve the problem of high diaphragm integrity testing cost in the prior art.