43 results about "Leakage flow" patented technology

The invention relates to the technical field of safety valve fault monitoring, in particular to a safety valve full-life-cycle fault detection method and system, and aims to solve the problems that sudden safety accidents occur frequently due to the fact that a traditional method depends on leakage flow monitoring and cannot capture hidden faults such as valve element jamming and spring fatigue, a power supply system mostly adopts a single power generation mode, and the power consumption is low. In a low discharge scene, the electric quantity of the energy storage module is used up, and monitoring interruption is caused. According to the invention, the problems of safety valve hidden fault monitoring deficiency and unstable power supply are effectively solved. By means of multi-dimensional data collection, spring elasticity attenuation and valve element movement abnormity can be found in advance, and faults are prevented from being evolved into serious leakage. The composite power supply system maintains basic monitoring in the non-discharge stage, energy is quickly supplemented in the discharge stage, and continuous operation of the whole life cycle is guaranteed. A model analysis result can guide maintenance personnel to accurately position a fault part, and unnecessary shutdown maintenance is reduced.

The embodiment of the invention provides a leakage current detection method and device, electronic equipment, a storage medium and a program product. The leakage current detection method comprises the following steps: controlling at least part of driving circuits of a display panel to stop transmitting driving signals to corresponding sub-pixels; at least part of the driving circuits are controlled to supply power to the corresponding sub-pixels according to the reference voltage value, the sub-pixels are connected with the first power supply end of the display panel, and the voltage difference between the reference voltage value and the voltage of the first power supply end of the display panel is smaller than the lightening voltage of the sub-pixels corresponding to the driving circuits; and according to the current received by a current monitoring end of the display panel, a leakage current detection result of the display panel is determined, and the current monitoring end is arranged at the first power supply end. According to the scheme, leakage current detection of the display panel is realized, the yield of the display panel passing product detection is improved, and resource waste of the display panel in the actual application process is reduced.

The invention relates to the technical field of leakage detection, and discloses a natural gas leakage quantitative detection method and system based on voiceprint, and the method comprises the steps: collecting a vibration signal of a sound wave sensor, determining the position of a leakage point according to a voiceprint array, and obtaining the fluid leakage flow speed of each fluid detection region, preprocessing the fluid leakage flow velocity to obtain the leakage flow velocity, constructing a leakage flow velocity sample for the corresponding fluid detection area according to the leakage flow velocity, and determining the current leakage environment according to the increasing quantity, the decreasing quantity and the negative quantity; acquiring the historical leakage flow rate in the same leakage environment as the current leakage environment, comparing the leakage flow rate with the historical leakage flow rate, judging whether to correct the leakage flow rate according to the comparison result, and determining a leakage correction factor according to the similar result of the leakage flow rate and the historical leakage flow rate data set. And determining a leakage interval according to the leakage type and the final leakage flow velocity. The method has the characteristic of good quantitative detection of leakage.

The invention discloses a leakage-proof shell-and-tube heat exchanger which comprises a fixedly connected shell, two tube plates, a plurality of heat exchange tubes, a shell side inlet, a shell side outlet, a tube side inlet, a tube side outlet and a plurality of baffle plates, and the gap between the baffling end of each baffle plate and the inner wall of the shell is larger than the gap between the other outer circumference and the inner wall of the shell. The baffle ends of two adjacent baffle plates are arranged in opposite directions in the radial direction; annular plates are arranged on the two axial sides of each baffle plate at intervals, the radial outer ends of the annular plates are connected with the inner wall of the shell, the radial inner ends of the annular plates are located on the radial inner sides of the other outer circumferences of the corresponding baffle plates, and the baffle ends of all the baffle plates are located on the radial inner sides of the radial inner ends of all the annular plates. The sum of axial gaps between each baffle plate and the annular plates on the two sides of the baffle plate is smaller than the minimum gap between the baffle plate and the inner wall of the shell; the heat exchanger not only can prevent leakage flow, improve heat exchange efficiency, reduce vibration and noise and prolong service life, but also has the advantages of being easy and convenient to manufacture, install and maintain and wide in application range.

The invention discloses a pressure relief valve, comprising: a valve body; and the plurality of discharge units are arranged in the valve body. According to the pressure relief valve, a module combination is formed through the multiple small relief units, a large relief area is formed, and due to the fact that the area of each relief unit is small, a membrane disc is small in mass and fast in response, and the requirement for large relief flow is met while fast response is achieved; according to the pressure relief valve, the number of the relief units can be selectively increased or decreased according to use scenes, different relief areas can be obtained, pressure relief valves with different relief calibers can be developed, only the shell and the valve seat which are matched need to be selected or designed, modular design and manufacturing are achieved, additional design and experiment do not need to be carried out, and the development cost is greatly reduced.

The invention provides a thoracic cavity leakage flow monitoring method and device, electronic equipment and a storage medium, the method is suitable for thoracic cavity drainage equipment, the thoracic cavity drainage equipment comprises a pressure sensor and a pressure negative pressure pump, the pressure negative pressure pump is connected with postoperative thoracic cavity leakage gas, and when the thoracic cavity leakage flow is monitored, the pressure sensor is connected with the pressure negative pressure pump. The method comprises the following steps: firstly, acquiring the current pressure of thoracic cavity leakage gas through a pressure sensor, acquiring the current duty ratio corresponding to the current power of a driving pressure negative pressure pump, then inquiring a leakage flow matrix according to the current pressure and the current duty ratio, judging whether any reference pressure is equal to the current pressure, and if yes, executing the next step; if yes, the current air leakage flow of the thoracic cavity is directly searched for from the matrix, and if not, the reference air leakage flow corresponding to the adjacent pressure point and the air leakage flow-pressure slope corresponding to the current duty ratio are combined to conduct complement operation to obtain the current air leakage flow of the thoracic cavity. According to the invention, the current air leakage flow of the thoracic cavity can be accurately calculated and monitored in real time.

A centrifugal compressor is provided. The system includes an overall inlet passage 1, adjustable inlet guide vanes 2, an impeller 3, a variable diffuser 4, a volute casing 5, and an overall outlet passage 6. A tip gap 10 is provided between the impeller and an impeller cover, and a disk cavity is formed between the side of the impeller far from the adjustable inlet guide vanes and the impeller cover. Measurement point densification areas are provided within the impeller, tip gap, and disk cavity, and flow field measurement points are provided at intervals along the fluid flow direction within the impeller, tip gap, and disk cavity, with the spacing between the flow field measurement points located within the measurement point densification area being smaller than the spacing between the flow field measurement points located outside the measurement point densification area. The loss mechanism of the internal leakage flow field between the impeller and the blade tip gap and the external leakage flow field of the disc cavity is studied in detail, and the coupling mechanism of the main flow and leakage flow in the impeller is fully taken into consideration, which improves the granularity, authenticity and reliability of the measurement results and enables the collection of more and more accurate fluid data in the high-density measurement point area.

The invention discloses a PI regulator with a leakage compensation function and a null drift suppression method thereof.According to the PI regulator, a leakage observer and a leakage PI compensator are embedded in a classic PI regulator, the leakage observer executes a real-time leakage flow estimation algorithm and inputs the estimated real-time leakage flow into the leakage PI compensator, and the leakage PI compensator and the leakage observer are connected in sequence. The leakage PI compensator calculates leakage compensation current according to the real-time leakage flow and inputs the leakage compensation current into the adder, the adder adds the output control signal and the leakage compensation current to obtain a control current instruction, and the control current instruction is input into the servo amplifier and controls displacement of the oil cylinder through the servo valve. According to the method, a leakage observer and a leakage PI compensator are used for calculating leakage flow and leakage compensation current, saturation judgment and current amplitude limiting are executed, and corresponding leakage compensation current is output. According to the PI regulator and the zero drift suppression method thereof, oil cylinder position drift is greatly reduced, zero return overshoot is completely eradicated, manual calibration is canceled, one-time calibration is effective for a long time, and the equipment cost is reduced.

The application provides a tubing leakage DAS monitoring physical simulation experiment device and experiment method, and belongs to the technical field of oil and gas well safety monitoring.The application constructs a physical simulation experiment device composed of a distributed optical fiber acoustic wave monitoring system, a wellbore leakage simulation system, a liquid supply system and a waste liquid recovery system, sets a leakage point simulation assembly with a replaceable leakage channel at a preset position of the simulated wellbore, simulates tubing leakage working conditions under different leakage point positions, leakage point forms, injection flow rates and fluid types, collects acoustic wave profiles of the whole wellbore section by using the distributed optical fiber acoustic wave monitoring system, and constructs a quantitative relationship model of leakage flow rate and acoustic wave energy.The application can simulate complex leakage working conditions of oil and gas wells, realizes rapid replacement and comparison experiments of various leakage point forms, overcomes the limitation of single leakage point type of traditional experiment devices, and provides experiment support for accurate positioning and quantitative evaluation of tubing leakage points based on optical fiber acoustic wave monitoring.

The invention provides a breather valve pressure detection method and system, and belongs to the technical field of special valve detection.The method comprises the steps that based on PLC programming control, accurate output of positive pressure and negative pressure is achieved through a high-precision electric control proportional valve, and online detection and offline detection dual-mode operation is supported; the opening state of a breather valve is automatically recognized through pressure difference judgment logic, and automatic collection of positive and negative pressure operation pressure and leakage flow is achieved in combination with sensor zero drift correction and storage tank pressure deviation correction during online detection; and meanwhile, multiple times of data acquisition and averaging are supported, a report is automatically generated and exported from detection data, and remote monitoring can be realized. The system is simple in hardware structure and stable in operation, the detection precision, efficiency and data reliability of the breather valve are greatly improved, and the technical blank of online high-precision detection of the breather valve is filled.

The invention discloses a measuring weir leakage flow monitoring method and device based on actual measurement calibration. The method comprises the steps that multiple sets of actual measurement water level values and corresponding actual flow values of a measuring weir under different working conditions are obtained; fitting based on the actually measured water level value and the actual flow value to generate an exclusive water level-flow relation model; constructing a high-density water level-flow lookup table covering a full water level range by using an interpolation algorithm; automatically collecting a real-time water level value of the measuring weir and performing interpolation calculation based on the lookup table to obtain a corresponding flow value; the flow value obtained through interpolation calculation and the flow value calculated based on the exclusive water level-flow relation model are compared and verified, and the flow value consistent with the comparison result is output. According to the method, the precision and reliability of measuring weir leakage flow monitoring can be remarkably improved, calculation errors caused by weir body shape deviation and flow state complexity in a traditional theoretical formula are effectively overcome, and long-term automatic high-precision flow monitoring is achieved.

The application discloses a kind of inner leakage flow signal curve judgment method, device, medium and electronic equipment.The method comprises: by switching to small flow meter and closing the reversing valve except flow meter reversing valve by flow meter reversing valve, the rated positive value and rated negative value of control signal are obtained, so as to obtain inner leakage flow signal curve;For different throttle, by controlling the state of each reversing valve, the rated positive value and rated negative value of control signal are obtained, so as to obtain corresponding throttle flow signal curve;According to the throttle flow signal curve, the accuracy of the inner leakage flow signal curve is judged.The technical scheme provided by the application can improve the accuracy of judging inner leakage flow signal curve.

The utility model relates to the technical field of automobile detection, and particularly discloses an air tightness detection mechanism of an automobile laser radar cover, which comprises an upper die sealing cover, a lower die sealing cover and a product support, and is characterized in that a sealing cover sealing strip is clamped between the upper die sealing cover and the lower die sealing cover, and the product support is arranged on the lower die sealing cover. A product is placed on the product support, and a support sealing strip is clamped between the product and the product support. By simulating the water flow direction and the wind direction, 10 Kpa of low-pressure gas is filled into the shell of the product, and the inner cavity of the product is vacuumized to reach the negative pressure value of-10 Kpa. And standing for 1 minute, and detecting the value of pressure reduction of the inner cavity and the value of gas leakage flow by using a pressure sensor. And the inflation pressure and the vacuumizing negative pressure cannot cause damage to electronic components.

The utility model relates to the technical field of solar cell manufacturing, in particular to a leaked liquid collecting device and groove type cleaning equipment, the leaked liquid collecting device comprises a collecting main body and a spraying part, the collecting main body is provided with a first collecting cavity, the first collecting cavity is used for collecting leaked liquid of a cleaning groove, and a collecting hole is formed in the bottom wall forming the first collecting cavity; the spraying part is arranged in the collecting main body, and the spraying part is used for flushing leaked liquid in the first collecting cavity into the collecting holes by spraying liquid; and the collecting hole is used for being communicated with a recycling box, and the collecting hole is used for guiding leaked liquid in the first collecting cavity into the recycling box. The device can have the following advantages that when the cleaning tank leaks, leaked liquid can flow into the first collecting cavity, then through the flushing effect of the spraying part, the leaked liquid is rapidly collected into the recycling box through the collecting holes, consumption of manual treatment resources is reduced, and leaked liquid recycling is safer, more convenient and faster.

Method for measuring and DC leakage flux compensating single-core loop ohmmeter. Single-core ohmmeter for measuring a loop impedance Zx, comprising a single transformer having a primary winding of Np turns (14) and a secondary winding of a single turn (16) forming a measuring loop of impedance Zx, wherein to compensate for a parasitic induction produced by a DC leakage current flowing in the measuring loop without canceling a measuring current Ip generating an alternating induction of constant average value for the measurement of the loop impedance Zx,The transformer has a second secondary winding of Na turns (18) whose output voltage Ub is delivered to a processing module (30-40) providing a voltage intended to be added to an alternating measurement voltage Vp in an adder (22) delivering the current to be injected into the primary winding (14) after passing through a voltage-to-current converter (20) supplying current to the primary winding via a shunt resistor (19). Figure for the abbreviation: Fig. 6.

The present invention relates to the technical field of leakage detection, and discloses a natural gas leakage quantitative detection method and system based on voiceprint, the method comprising: collecting vibration signals of an acoustic wave sensor and determining the position of a leakage point according to a voiceprint array, obtaining the fluid leakage velocity of each fluid detection area, pre-processing the fluid leakage velocity to obtain the leakage velocity, constructing a leakage velocity sample for the corresponding fluid detection area according to the leakage velocity, determining the current leakage environment according to the increase number, decrease number and negative number; obtaining the historical leakage velocity of the leakage environment that is the same as the current leakage environment, comparing the leakage velocity with the historical leakage velocity, judging whether to correct the leakage velocity according to the comparison result, determining the leakage correction factor according to the similarity result between the leakage velocity and the historical leakage velocity data set, and determining the leakage interval according to the leakage type and the final leakage velocity. The present invention has good characteristics of quantitatively detecting leakage.

The invention discloses a feedforward flow compensation control method of a 3D printer, and belongs to the technical field of additive manufacturing. The problems that an existing screw pump type printing head is unstable in flow and delayed in response are solved. Comprising the following steps: establishing a fluid model of a cavity in a stator and rotor meshing area of the screw pump, and establishing longitudinal and transverse leakage flow expressions of the screw pump; a steady-state flow prediction model of the screw pump is obtained based on the fluid model and the leakage flow expression, and cavity inlet pressure is obtained through calculation; obtaining a flow control instruction according to the cavity inlet pressure; calculating system delay time based on the fluid model and the cavity inlet pressure; calculating a motor speed based on the corresponding relationship between the system delay time and the theoretical flow of the fluid in the printing nozzle, and determining a speed control instruction based on the motor speed; and feed-forward flow compensation control of the 3D printer is achieved based on the flow control instruction and the rotating speed control instruction. The 3D printer is used for realizing high-precision volume control and quick-response 3D printing.

The invention discloses a shape memory alloy plug and a microchannel heat exchanger leakage blocking method.The plug comprises a guide head part, a deformation umbrella cover and a center supporting column, the center supporting column is arranged at one end of the guide head part in the axial direction, and the deformation umbrella cover is conical and arranged on the guide head part in a surrounding mode; the deformation umbrella cover is made of shape memory alloy, and under the action of external force, the deformation umbrella cover is folded to form a cylindrical structure surrounding the outer side of the central supporting column. After the plug is manufactured, the conical umbrella cover is changed into a cylindrical shape through external force, then the plug is injected into a flow channel, and by means of the temperature deformation recovery effect of the shape memory alloy plug, the shape of the conical umbrella cover is recovered near a leakage point, and after the conical umbrella cover makes contact with the wall face of the flow channel, rapid recognition of the leakage position and plugging treatment of the leakage point are achieved. The method is simple in principle, high in realizability, easy and convenient to operate, capable of rapidly recognizing the leakage flow channel and automatically achieving leakage point blocking treatment and good in market application prospect.

The present application provides a method, device, electronic device and storage medium for monitoring the thoracic leakage gas flow rate. This method is applicable to thoracic drainage devices, which include a pressure sensor and a pressure negative pressure pump. The pressure negative pressure pump is connected to the thoracic leakage gas after surgery. When monitoring the thoracic leakage gas flow rate, first, the current pressure of the thoracic leakage gas is obtained through the pressure sensor, and the current duty cycle corresponding to the current power of the driving pressure negative pressure pump is obtained. Then, the leakage gas flow rate matrix is queried according to the current pressure and the current duty cycle to determine whether any reference pressure is equal to the current pressure. If so, the current leakage gas flow rate of the thorax is directly found from the matrix. If not, the current leakage gas flow rate of the thorax is obtained through interpolation calculation by combining the reference leakage gas flow rate corresponding to the adjacent pressure points and the leakage gas flow rate-pressure slope corresponding to the current duty cycle. The present application can accurately calculate and monitor the current leakage gas flow rate of the thorax in real time.

The utility model relates to a triggering alarm system based on ore pulp running, which comprises a leakage flow guide pipe and a sensing ball arranged below a circulation opening of the leakage flow guide pipe, a connecting long rod is fixedly arranged on the outer side of the sensing ball, one end, far away from the sensing ball, of the connecting long rod is fixedly connected with a connecting disc, the connecting disc is connected with a connecting ring in an inserted mode, and the connecting ring is connected with the leakage flow guide pipe. The outer side of the connecting ring is fixedly connected with a connecting rotating rod, the connecting rotating rod is rotatably connected with a rotating plate, a supporting column is arranged on the side edge of the rotating plate in a penetrating mode, an adjusting rod is arranged on the side edge of the rotating plate, a controller is inserted into the end, away from the rotating plate, of the adjusting rod, and the controller is electrically connected with an air defense alarm through a cable. And the sensing ball is in electric signal connection with the air defense alarm. According to the ore pulp running and overflowing triggering alarm system, under the combined use of the sensing ball, the air defense alarm and the controller, the device has the alarm effect in two operation modes, and the reliability and stability of the device in ore pulp running and overflowing triggering alarm are improved.

The system is designed to compensate for flow disturbances when changing the flow rate in the system. The system includes a flow source device (12) having an inlet and an outlet. The inlet is configured to receive a fluid at a first pressure, and the outlet is configured to output a fluid at a second pressure higher than the first pressure. The system also includes a fluid control device (20) having an inlet port (30) and a discharge port (34). The inlet port of the fluid control device is configured to receive the flow from the outlet of the flow source device. In addition, the system includes a constant flow regulator (68) configured to provide a leakage flow to a discharge output (69). The constant flow regulator is configured to reduce the leakage flow in response to the discharge port of the fluid control device.

Method for measuring and single-core loop ohmmeter with AC leakage flux compensation. Single-core ohmmeter for measuring a loop impedance Zx, comprising a single transformer having a primary winding of Np turns (14) and a secondary winding of a single turn (16) forming the measuring loop, in which, to compensate for a parasitic induction produced by an AC leakage current flowing in the measuring loop without canceling a measuring current Ip generating an alternating induction of constant average value for the measurement of the loop impedance Zx, the transformer comprises a second secondary winding of Na turns (18) whose output voltage Ub, representative of the AC leakage current, is delivered to a processing module (24,26) providing a voltage intended to be added to an alternating measurement voltage Vp in an adder (22) delivering the current to be injected into the primary winding (14) after passing through a voltage-to-current converter (20). Figure for the abbreviation: Fig. 5.,

The embodiment of the invention provides an ultrasonic gas leakage detection method and device, electronic equipment and a computer storage medium. The method is applied to an ultrasonic fuel gas speed measuring device, and the device comprises a first valve and a second valve which are arranged at the two ends of a fuel gas channel, and a first ultrasonic sensor and a second ultrasonic sensor which are arranged in the fuel gas channel. The method comprises the following steps: operating the first valve and the second valve, detecting a calibration time difference and a real-time time difference by using the first ultrasonic sensor and the second ultrasonic sensor, and calibrating the real-time time difference by using the calibration time difference to obtain a calibrated time difference; calculating the gas leakage flow velocity according to the calibrated time difference; according to the ultrasonic gas leakage detection method, the gas leakage detection precision can be improved, and interference caused by time drift or temperature drift is overcome.

The invention relates to a system (10) for checking the tightness of the upstream purge cavity of a turbomachine (1) which includes a low pressure turbine (90) comprising a plurality of discs (91) and an inner ring (99) integral with the discs (91), the discs (91) and the inner ring (99) delimiting the upstream purge cavity (80), each of the discs (91) being assembled to the adjacent disc (91) by an interdisc link (50) located in the upstream purge cavity (80). The system (10) comprises a vacuum pump (11), a flow measurement device (12), and a side wall (13), and is adapted to be assembled on the turbomachine (1) so as to hermetically seal a portion (81) of said upstream purge cavity (80), which is delimited upstream by the side wall (13) and which contains at least one of the interdisc connections (50), and the flow measurement device (12) is adapted to measure the leakage flow from the portion (81). Figure 2

TITLE: DEVICE FOR STOPPING A LEAKAGE FLOW ON A FLUID PIPELINE The device (30) for stopping excess flow of a leak on a fluid pipeline comprises: - a seal holder having a tubular channel, - a lip seal that is leak-proof to the fluid flowing in the pipeline, - a plug (35) opposite the upstream end of the tubular channel, - an anchoring means configured to anchor the seal holder in the predetermined pipeline, and - a plug seat (34) mounted on the seal holder and having lateral openings for the passage of fluid towards the head (351) of the plug and towards the upstream end of the seal holder.The shutter head extends from a movable body (353) in a guide (32) comprising the return means (33) and wherein the shutter seat and the guide have, on their outer surface, a flow deflector (323, 342) configured to reduce fluid drag on the shutter head, this flow deflector being supported by the shutter guide and by the shutter seat and having a conical shape whose apex is located in the shutter guide. (Figure for abbreviation: Figure 4).

The invention relates to a system (10) for controlling the sealing of the upstream purge cavity of a turbomachine (1) which comprises a low-pressure turbine (90) comprising a plurality of discs (91) and an internal ring (99) secured to the discs (91), the discs (91) and the internal ring (99) delimiting the upstream purge cavity (80), each of the discs (91) being assembled to the adjacent disc (91) by an inter-disc connection (50) located in the upstream purge cavity (80). The system (10) comprises a vacuum pump (11), a flow measurement device (12) and a side wall (13), and is capable of being assembled on the turbomachine (1) so as to seal a portion (81) of said upstream purge cavity (80) which is delimited upstream by the side wall (13) and which contains at least one of the inter-disc connections (50), and the flow measurement device (12) is capable of measuring the leakage flow rate from the portion (81). Figure 2

The application relates to the field of gas turbine turbine blade cooling technology and discloses a slot structure applied to guide vane leakage flow and a cooling device, which comprises a first slot surface and a second slot surface, a cooling channel is formed between the first slot surface and the second slot surface, and the cooling channel is used for guiding cooling gas; wherein a plurality of grooves are arranged on the first slot surface in a direction perpendicular to the flow direction of the cooling gas, a convex position is formed between two adjacent grooves, the convex position comprises two side edges, the two side edges extend in a direction away from the first slot surface and meet to form an end point position, a plurality of end point positions are located on the same plane and are parallel to the second slot surface, and the grooves and the convex position are symmetric with respect to the center line of the side edge. The application can make the cooling gas better cover the surface of a turbine guide vane edge plate and an end wall, has better circumferential covering capacity, has better cooling effect, and can reduce the cooling gas consumption on the basis of achieving the same cooling efficiency.

The polishing solution storage equipment comprises a main tank body and a protective cover, a plurality of branch tank bodies are evenly installed in the main tank body, storage cavities are formed in the branch tank bodies, a feeding branch pipe is installed on one side of the top of each branch tank body, and a discharging branch pipe is installed on the other side of the top of each branch tank body. And one end of the feeding branch pipe is connected with the feeding main pipe. The device has the beneficial effects that through a dual protection structure of outer rigid protection and inner flexible buffering, a monitoring-flow guiding-recycling integrated leakage emergency system and adaptive design of multi-tank independence and automatic control, the core advantages of being good in protection effect, efficient in leakage flow guiding and high in practicability are achieved; the problems that a traditional polishing solution storage device is prone to collision and leakage, large in loss after leakage, prone to layering of the polishing solution and poor in adaptability are effectively solved, the storage safety, stability and operation and maintenance convenience of the polishing solution are remarkably improved, and the high-precision and multi-process requirements of silicon carbide substrate polishing are met.

This invention discloses a method for controlling the leakage velocity of phase change materials (PCMs) under high flow rates, comprising: acquiring initial configuration data of the target leakage channel and characteristic model parameters of the PCM; real-time acquisition of fluid state observation sequences of the leakage channel; inverting the real-time equivalent geometric parameters and flow field characteristic parameters of the channel based on the observation sequences; estimating the residence time window of the injected grout in the channel; estimating the phase change solidification time window by combining the characteristic model parameters and the observation sequences; determining the control criterion index based on the ratio of the residence time window to the phase change solidification time window; generating an adaptive control vector based on the control criterion index, driving the actuator to adjust the injection parameters until the flow rate control termination condition is met. This invention utilizes the solidification and residence of the PCM in the leakage channel to form a hindrance, reducing the water flow velocity in the high-velocity leakage channel to the workable range of traditional grouting methods, creating low-velocity conditions for subsequent seepage prevention treatment.

The invention relates to the technical field of valve detection, in particular to a laser sensor measurement system for safety valve leakage quantity verification, which comprises a mounting base, a laser detection component and a bubble generation assembly, the bubble generating assembly comprises a guide rail assembly, a gas circuit assembly, a sealing valve element, an unlocking assembly and a locking transverse rod. The guide rail assembly is arranged in the middle of the rear portion of the mounting base in the longitudinal direction. The gas circuit assembly is arranged in the guide rail assembly in a sliding mode. The sealing valve element comprises a valve element body and a locking assembly. According to the measuring system, the leakage flow can be displayed in real time, and threshold value feedback is achieved; leakage airflow of the safety valve can be intercepted through the sealing valve element, the leakage airflow of the safety valve can also be detected by detecting the intercepted airflow, and due to the fact that the intercepted airflow is small, the floating ball can be located at the low position in the air outlet pipe; the positive correlation between the height of the floating ball in the position range and the size of the airflow which can be intercepted is tighter, and the measurement result is more accurate.