12 results about "Residual pressure" patented technology

The embodiment of the present application provides a spraying system, a control method and device, and a spraying equipment. The spraying system comprises a liquid pump, a first on-off valve and a control unit. The control unit is used for acquiring a physical parameter value of the spraying system, determining a working state of the liquid pump according to a relationship between the physical parameter value and a preset range of the physical parameter value, and controlling the liquid pump and the first on-off valve to work according to the working state. The technical scheme provided by the embodiment of the present application controls the spraying system to perform corresponding actions according to the working state of the liquid pump, so as to prevent air from entering the liquid outlet pipe, to remove the air in the liquid inlet pipe and the liquid pump as soon as possible, and to release the residual pressure in the liquid outlet pipe when the liquid pump is turned off. Thus, the air difficult to remove in the liquid outlet pipe and the dripping of the nozzle are prevented, the stability of the spraying system is improved, the liquid outlet pipe is still full of liquid under the condition that the liquid pump is stopped for a long time, and the accuracy and timeliness of the spraying action are realized.

This invention provides a method for dynamic prediction of cement slurry weight loss in long inclined vertical well sections. The method includes: calculating the effective bottom hole pressure P during the cement slurry weight loss process. b Effective pressure at the bottom of the well, P b The calculation formula is: P b = P0 + P1; where P0 is the liquid column pressure at the top of the cement slurry; P1 is the effective pressure of the cement slurry; the calculation of the effective pressure P1 of the cement slurry includes determining the remaining pressure P after the cement slurry gels and loses weight, taking into account the eccentricity of the tailpipe and the downhole temperature and pressure. sy The residual pressure P after the cementation and weight loss of the mud obtained by this invention sy The calculations are more consistent with the gelation and weight loss characteristics of cement slurry under complex downhole conditions, effectively ensuring the accuracy of dynamic prediction of cement slurry weight loss.

A method of forming an antifriction layer (3 ') on a shaft member (1) using a hot isostatic pressing process, comprising the steps of: 1) providing a sheath (5) having an inner space in accordance with the shape of an integral blank in which the shaft member (1) and the antifriction material (3) are intended to form; 2) assembling the shaft component (1) and the antifriction material (3) in a sheath (5) according to the shape requirement of the integrated blank; (3) degassing and sealing the sheath, and enabling the residual pressure in the sheath to be lower than a preset vacuum pressure threshold value; (4) hot isostatic pressing treatment is conducted on the sheath provided with the shaft component and the antifriction material, so that metallurgical bonding of the antifriction material and the shaft component is achieved; and (5) the sheath is removed, and follow-up machining is conducted on the integrated blank obtained after metallurgical bonding according to needs. Wherein the anti-attrition material is a metal foil made of an anti-attrition metal material. In addition, the invention also provides a shaft member (1) formed by adopting the method and a sliding bearing (10) comprising the shaft member.

The present invention relates to the technical field of industrial circulating water pipe pressure regulation, and specifically to a main pipe excess pressure power generation method and system based on AI adaptive control. The present invention collects the water pressure and voltage data of each branch pipe valve in time series, and calculates the relevant change factors according to the water pressure and voltage changes in a preset time range. The energy loss rate of each branch pipe valve is obtained based on the factor difference of adjacent branch pipe valves. A total loss function under different main pipe pressures is established, and the loss factor is derived from it. By comparing the change trend and numerical difference of the loss factor under each pressure, the optimal main pipe pressure corresponding to the minimum energy loss is determined. The main pipe excess pressure is regulated accordingly. The present invention can determine a more suitable main pipe pressure range, so that the industrial water circulation system is always in a low-loss and high-energy-utilization state.

The application discloses a differential pressure type gas pipeline leakage measuring and controlling device and method, and relates to the technical field of gas pipeline safety monitoring. The device comprises an inlet electromagnetic valve, an outlet electromagnetic valve, a differential pressure transmitter, a control module and a communication module; the two valves are connected in series along the airflow direction, and the differential pressure transmitter collects the differential pressure signal between the two ends of the outlet electromagnetic valve. In the on state, the differential pressure signal is collected to identify large leakage and medium leakage; in the off state, the differential pressure change is collected through a tightness test to identify large and small micro-leakage. The method is divided into a non-disturbance tightness test and a disturbance tightness test, and is automatically executed in a non-gas use period. The method has high sensitivity, low false alarm rate and does not affect the gas use of users. The application can cover all scenarios of courtyard, building, vertical pipe, household, overhead and buried gas pipelines, effectively solves the problems that the prior art cannot identify large and medium leakage with high residual pressure, has insufficient sensitivity and is interfered by tests, and improves the operation safety of the gas pipeline.

The high-pressure-resistant plastic pipe comprises a pipe body, the pipe body is sequentially provided with a flow guide layer, a buffer layer, a reinforcing layer and a protective layer from inside to outside, protrusions used for flow guide are integrally formed on the inner wall of the flow guide layer, and flow dividing cavities are formed in the protrusions at intervals. And a water inlet and a water outlet are respectively formed in the bulge and correspond to the shunting cavity. Through the collaborative design of the flow guide layer, the buffer layer, the enhancement layer and the protection layer, step-by-step dissolution of pressure and efficient regulation of water flow are achieved, protrusions of the flow guide layer are matched with the flow dividing cavities, water flow impact is weakened, turbulent flow is avoided, stepped absorption of the pressure is achieved through the gradient honeycomb structure of the buffer layer, and the flow dividing effect is improved. The three-dimensional stress network of the reinforcing layer disperses residual pressure, finally, the risk of local stress concentration of the pipe body is greatly reduced, compared with a traditional single-structure pipe, the operation stability under the high-pressure working condition is remarkably improved, and the problems of cracking and leakage caused by pressure overload are effectively avoided.

The utility model discloses an automatic pressure relief sealing valve for birch juice transport vehicle, including valve seat, both sides of the top of valve seat all are fixedly connected with connecting seat, be provided with water delivery cavity in the valve seat and connecting seat, the top fixedly connected with valve body of connecting seat, the bottom of valve seat is provided with water inlet, water inlet is linked together with water delivery cavity, the bottom of one side of valve body is provided with water outlet, the top of valve body is provided with drain in water outlet, the inside movable joint of valve body has the piston, the top of piston is provided with valve rod, the utility model relates to valve technical field, solved in the prior art, the valve after closing water supply, in the equipment use process, often can accumulate certain pressure in the inside pipe, if these residual pressure does not release in time, possibly cause damage to the valve itself, also can influence the stable operation of entire water supply system, even cause the problem of security hidden danger.

The intelligent residual pressure monitoring device comprises a residual pressure sensor, a mounting plate, a sealing cover, a cover opening and closing control mechanism, a single-chip microcomputer, an electromagnetic valve and a pump machine, the residual pressure sensor is mounted on the surface of the mounting plate, the sealing cover is mounted on the mounting plate, the residual pressure sensor is covered with the sealing cover, the cover opening and closing control mechanism is connected with the sealing cover, and the single-chip microcomputer is connected with the electromagnetic valve. The sealing cover is sequentially connected with an electromagnetic valve and a pump machine through a pipeline, and the residual pressure sensor, the cover opening and closing control mechanism, the electromagnetic valve and the pump machine are all electrically connected with a single chip microcomputer; according to the technical scheme, the cover opening and closing control mechanism closes the sealing cover, standard pressure (such as 0Pa, 50Pa and 100Pa) is generated and injected into the sealing cover for calibration reference under the cooperation of the pump machine and the electromagnetic valve, the output of the residual pressure sensor is corrected through linear regression, data before and after calibration are compared, and calibration is repeated if the error is greater than 1Pa, so that automatic calibration of the residual pressure sensor is realized, and the calibration accuracy is improved. And the reliability of the residual pressure monitoring device is improved.

This invention provides a method for calculating the minimum bottom hole residual pressure P during the weight loss process of cement slurry in a long inclined vertical well section. b The ultimate pressure loss ΔP caused by the liquid column pressure P0 at the top of the cement slurry and the reduction in the volume of the cement slurry. ss The ultimate residual pressure P after cement slurry sets and loses weight sy It is determined that it satisfies P. b =P0+P sy -ΔP ss The present invention takes into account the effects of tailpipe eccentricity and cement slurry hydration when calculating the minimum bottom hole residual pressure, which effectively improves the accuracy of the calculation of the minimum bottom hole residual pressure.

The invention discloses an urban gas pipe network leakage accident active controlled emission duration calculation method, and relates to the technical field of gas leakage emergency processing, and the method comprises the steps: obtaining an emergency valve closing position of a gas pipe network leakage accident, obtaining a plurality of emission ports based on the emergency valve closing position, and constructing an emission time sequence function based on the opening time of the emission ports; establishing a pipeline residual pressure-diffusion flow rate-diffusion time relational expression; constructing a diffusion working condition critical flow state duration calculation model, and establishing a judgment rule of a gas flow state in a gradual diffusion process; judging the gas flow state in the gradual diffusion process based on a judgment rule, and constructing a gradual diffusion process pipeline residual pressure calculation model to obtain the pipeline residual pressure based on a judgment result and the relational expression; according to the method, a gas pipe network multi-point emission duration calculation model is constructed, the total emission duration of the target pipeline is obtained, and the problem that the emission duration accuracy is low due to the fact that an existing gas pipe network gas emission duration calculation method adopts single-point emission calculation is solved.

The utility model relates to the technical field of perfusion, in particular to a pressure maintaining perfusion device which comprises a storage box used for storing materials to be perfused. The two ends of the conveying pipe communicate with the storage box and the outside correspondingly; the pressurizing part is communicated with the storage box, and is used for pressing gas into the storage box to pressurize the storage box, so that the to-be-filled material in the storage box is conveyed to the outside through the conveying pipe; the residue discharging pipe is arranged on the storage box, the residue discharging pipe is communicated with the outside, the residue discharging pipe is used for discharging the to-be-poured material and / or the cleaning fluid in the storage box, and a residual pressure release valve is arranged on the residue discharging pipe and used for releasing residual pressure after the device is used. A traditional dumping type pouring mode is adjusted into an integrated quantitative pressure pouring mode, it can be guaranteed that a proper air pressure value is kept in the device through the pressurizing piece and the residual pressure release valve, pouring materials are stably discharged, and the device is high in flexibility, convenient to move, capable of reducing the operation difficulty, high in pouring efficiency, not prone to spilling and leaking and suitable for being used on ships.

The utility model belongs to the technical field of power generation devices, and particularly relates to an energy-saving power generation device utilizing residual pressure of a secondary water supply system, which comprises a shell, a power generation device and a power generation device, the cylindrical block is arranged in the shell, and the axis of the cylindrical block coincides with the axis of the shell; the cylindrical block rotates axially by taking the axis of the cylindrical block as an axis; the cylindrical block is provided with a first channel and a second channel which penetrate through the cylindrical block in the axis direction of the cylindrical block. A mounting groove is formed in the first channel, and a flow channel is formed in the second channel; the pipelines are arranged on the two opposite sides of the shell, and a water inlet and a water outlet are formed in the opposite positions of the pipelines respectively; and the power generation mechanism is arranged in the mounting groove. The utility model solves the problems that the water pressure is reduced and the water replenishing speed of the water tank is slowed down due to the fact that the existing power generation device is fixed in the pipeline for a long time for water flow power generation, and the water demand of residents in peak hours is difficult to meet.