2352 results about "Choke valve" patented technology

The invention discloses a hydraulic system throttling control method based on a hydraulic control one-way valve, which relates to the technical field of throttling control, and comprises the following steps of: in an initialization stage of starting a hydraulic system, setting an optimal initial throttling opening for a throttling valve based on flow data of current oil; the method comprises the following steps: performing high-frequency real-time acquisition on flow state data of oil through a sensor deployed at the upstream of a throttling area, and establishing a set of flow state data system based on a time sequence; continuously collected flow state data are divided according to time windows, and an analysis set of oil flow data is constructed. According to the method, the dynamic flowing state of oil is monitored and deeply analyzed in real time, the load state is intelligently predicted in combination with a support vector machine model, and the opening degree of the throttling valve is adjusted in real time; the problems that in the prior art, response of a throttling control strategy to a high-load working condition is delayed, and oil temperature rise and viscosity abnormal reduction are caused by serious local pressure loss of a throttling area are effectively solved.

Embodiments include a choke system that passes enlarged debris despite having a relatively small diameter for an input port of the choke system. Embodiments also include systems to prevent dislodging of a choke seat when backpressure is supplied to the choke system. Embodiments also include sealing systems to prevent fluid leaks around the choke seat of the choke system.

A cage-type dual wedge throttle valve, comprising: a housing having an inner cavity; a valve cover arranged at the top of the housing; a valve seat arranged in the inner cavity, wherein the valve seat comprises an outer valve seat and an inner valve seat, and a plurality of flow holes are distributed on the peripheral wall of the outer valve seat; a valve core, which comprises two wedge-shaped surfaces and two cylindrical surfaces which are axially symmetrically arranged about the central axis, wherein the cylindrical surfaces face the direction in which a fluid flows into the inner cavity, and the cylindrical surfaces can fit the inner wall of the inner valve seat; and a valve stem having the two ends respectively connected to a driving device and the valve core, wherein under the driving of the driving device, the valve stem can drive the valve core to reciprocate in the valve seat in the axial extension direction of the valve stem. By means of the above solution, primary throttling is achieved when a fluid passes through the outer valve seat, and secondary throttling is achieved as the valve core gradually extends into the inner valve seat; moreover, the valve core comprises wedge-shaped surfaces, and a long throttling stroke is formed, thereby improving the throttling switching performance of the throttle valve; the symmetrical arrangement of the two wedge-shaped surfaces can balance the pressure on the two sides, thereby improving the stability of the valve core under force.

The invention discloses a control method of a flap unloading platform, which is applied to a hydraulic control system of the flap unloading platform, and comprises the following steps: acquiring a starting signal, and enabling a power driving branch based on the starting signal; the system pressure of a hydraulic control system of the turning plate unloading platform is controlled by the power driving branch to be gradually increased; in response to the fact that the system pressure is equal to the preset value, the power-on state of the main electromagnetic valve is changed, the first proportional throttle valve and the second proportional throttle valve are adjusted based on the second working state of the main electromagnetic valve, the first lifting oil cylinder and the second lifting oil cylinder are controlled to act, and the turning plate unloading platform is driven to rotate; and in response to rotation of the flap unloading platform to the preset angle, the power-on state of the main electromagnetic valve is changed, so that the flap unloading platform is controlled to stop rotating based on the first working state of the main electromagnetic valve. By controlling the first proportional throttle valve and the second proportional throttle valve which are independent, independent control over the first lifting oil cylinder and the second lifting oil cylinder is achieved so that synchronous action can be achieved.

The invention provides a method for simulating bypass ratio regulation and control under the complete machine condition of a turbofan engine, and the method is realized based on a double-shaft compressor tester, and belongs to the field of aero-engine tests.The method comprises the steps that control parameters under the complete machine state are determined; determining the control precision of the test state control parameters of the double-shaft compressor tester; constructing a control module which stores an adjusting rule in a whole machine state and is used for enabling the rotating speed of the fan and the rotating speed of the high-pressure compressor to be in a linkage mode in the test process; the fan pressure ratio is monitored, an outer culvert throttling valve is adjusted, then an inner culvert throttling valve is adjusted, the high-pressure compressor pressure ratio is monitored at the same time, and finally the inner culvert throttling valve and the outer culvert throttling valve are adjusted at the same time, so that the high-pressure compressor pressure ratio and the fan pressure ratio meet the requirements; the state of the double-shaft compressor tester is kept stable, and compressor parameters are collected through an inner and outer culvert exhaust collection device; the rotating speed of the high-pressure compressor or the rotating speed of the fan is adjusted according to the rotating speed difference of the fan and the high-pressure compressor in the complete machine state, and parameters of the compressor are collected after stabilization.

The invention provides a water working medium quasi-saturated compression high-temperature heat pump system based on an ejector, and belongs to the field of compression heat pumps. The problems that after an existing compression system flows through a throttling valve, the superheat degree of steam exhaust is large due to high-temperature lift compression, and the loss of available energy in the throttling process from condensate to a two-phase region is too large are solved. A multi-stage spraying atomization structure is adopted, a micro-nano liquid drop mist flow with the particle size controllable to be 50-200 nm and the liquid mass fraction adjustable to be 5%-10% is formed before compression, the airflow humidity regulation and control precision is remarkably improved, the quasi-saturation compression process is matched, and the thermal matching performance and the energy efficiency level of a system are effectively improved; a main flow inlet of the jet atomizer is changed into a compressor outlet from a condenser outlet, so that the response speed is increased, and meanwhile the jet atomizer is suitable for a complex variable-working-condition system; or single-stage compression is optimized into a two-stage compression form, so that higher heating temperature and more stable system operation are realized; or liquid from a lower-pressure position is injected, so that the injection capacity is improved.

The invention relates to a micro-spraying system irrigation uniformity control method and system, and belongs to the technical field of agricultural irrigation energy saving. Calculating the flow data of each nozzle according to the data of the flow meters of the branch pipes; calculating the pressure distribution of each node under the condition of no throttle valve by using the irrigation area pipe network hydraulic model, and finding out the part with too high or too low pressure in the pipe network; a throttle valve is installed on a main pipe of a pipe network in an irrigation area, and the opening degree of the throttle valve is adjusted and the pressure rise of a water pump is calculated by taking the most disadvantageous spray head in the pipe network as a pressure reference; the flow condition in the pipe network is monitored in real time through the flow meter, and data are uploaded; the pressure is calculated through the pipe network hydraulic model, when the water pressure in the pipe network is abnormal, the throttling valve needing to be adjusted and the opening degree are calculated, workers are informed, and early warning is conducted in time. The service life of the system is prolonged, and the irrigation efficiency and the water resource utilization rate are improved.

A needle for a choke valve assembly includes a base portion formed from a first non-superhard material and a tip portion formed from a superhard material. The needle also includes a brazed connection coupling the tip portion to the base portion. The brazed connection includes an insert formed from a second non-superhard material, in which the second non-superhard material is harder than the first non-superhard material and softer than the superhard material. In addition, the brazed connection includes a shim disposed between the insert and the base portion, a first layer of brazing material disposed between the base portion and the shim, and a second layer of brazing material disposed between the shim and the insert.

The invention discloses a compact rigidity damping inerter self-control type hydro-pneumatic spring and a working method. The bottom of the lower end of a plunger of a hollow structure is sealed, is downwards connected with a wheel and extends into an oil cylinder from bottom to top, the top of the upper end of the plunger is fixedly connected with a piston, and a row of plunger holes are formed in the upper portion of the plunger; the upper part of an upper cavity of the oil cylinder is sequentially connected with a damper and a small oil-gas chamber; the lower part of a lower cavity is sequentially connected with an inerter pipe, an adjustable throttle valve and a large oil-gas chamber; the upper end of the self-control device outer cylinder is fixedly connected with the piston; a self-control device inner barrel capable of moving up and down is coaxially sleeved in the self-control device outer barrel, the lower end of the self-control device inner barrel is sealed, and the upper section of the self-control device inner barrel is hinged to the oil cylinder upper end cover; an inner barrel upper row oil through hole formed in an inner barrel of the automatic control device is always located in an upper cavity of the oil cylinder, the upper edge of an inner barrel middle row oil through hole is aligned with the upper edge of an outer barrel upper row oil through hole, and the lower edge of an inner barrel lower row oil through hole is aligned with the lower edge of an outer barrel lower row oil through hole. The rigidity is changed, and the damping and the inerter can also be changed.

The invention discloses a load simulation loading system based on an engineering mechanical power system and a control method thereof, and relates to the technical field of mechanical power system simulation. The load simulation loading system comprises an engineering machinery power system, a load loading system, a whole vehicle control unit and an upper computer platform. The engineering machinery power system comprises a first oil tank, a main pump, a pilot pump, a pilot control handle, a signal control valve and a multi-way valve. The load loading system comprises a three-position four-way reversing valve, a proportional overflow valve, a first proportional throttle valve, a second proportional throttle valve, an electromagnetic valve, a third proportional throttle valve and a variable pump, wherein the three-position four-way reversing valve, the proportional overflow valve and the first proportional throttle valve are connected to the multi-way valve, the second proportional throttle valve and the electromagnetic valve are connected to an outlet of the proportional overflow valve, and the third proportional throttle valve is connected between the second proportional throttle valve and the second oil tank. And the three-position four-way reversing valve is constructed to enable an inlet of the proportional overflow valve to be communicated with one of the oil port A and the oil port B of the multi-way valve in a switching manner, and an outlet of the proportional overflow valve to be communicated with the other one of the oil port A and the oil port B in a switching manner.

The invention discloses a rigidity self-control type two-stage vibration reduction hydro-pneumatic suspension with four inertial elements and a working method. The rod end of a plunger rod in an oil cylinder downwards extends out of the oil cylinder and is fixedly connected with a wheel through a third connecting device and a lower connecting device in sequence; the oil cylinder is sequentially connected with an inerter pipe, an adjustable throttling valve, a damper and a small oil gas chamber through a first oil pipe, and a pipeline between the adjustable throttling valve and the damper is sequentially connected with a rigidity control valve, a normally-open first electromagnetic valve and a large oil gas chamber through a second oil pipe. A closed second electromagnetic valve and a hydraulic pump station are sequentially connected to a pipeline between the normally open first electromagnetic valve and the large oil gas chamber through a third oil pipe; a valve body of the rigidity control valve is fixedly connected with a vehicle body through a valve body clamping device, and a suspension controller is connected with a height sensor and further connected with an adjustable throttling valve, a normally-open first electromagnetic valve, a normally-closed second electromagnetic valve and a hydraulic pump station. Small rigidity is automatically provided when the suspension is located near the balance position, and large rigidity and large damping are automatically provided when the suspension is away from the balance position.

The invention discloses a throttling well killing manifold with a pressure adjusting function for offshore oil exploitation, and relates to the technical field of well killing manifolds, the throttling well killing manifold comprises a base, a four-way structure, a filtering device, a throttling device, an external connecting pipe, a liquid injection structure and a vibration reduction support, and the size of filtering holes of a filtering plate can be dynamically adjusted according to the content of gravel in oil gas; when the content of the gravel is high, the size of the filter holes is shrunk so as to achieve a finer filtering effect, and when the content of the gravel is low, the size of the filter holes is increased, the throughput of fluid is improved, pressure loss caused by increase of filter resistance is reduced, the service life of the filter screen is prolonged, and the throttling device can automatically adjust the opening degree of a throttling valve according to the pressure in a pipeline. When the pressure in the pipeline is sharply increased due to abnormal conditions, the throttle valve can be automatically closed to cut off a fluid channel of the pipeline, and meanwhile, the pressure relief device is started to release part of overhigh pressure, so that the pressure in the pipeline rapidly falls back to a safe range.

The utility model provides an open-loop controlled multifunctional hydraulic pulse test bench, which comprises a storage oil tank, an oil supply pump machine, a reversing valve, a pressurizing oil cylinder and an oil supplementing overflow valve, according to the test bed, a large amount of oil flows into a system at the moment that an oil way is opened by a reversing valve, and due to the fact that an overflow valve has a lag phenomenon in response, oil pressure instantaneously generates an overshoot peak value, pressure in a pipeline rapidly rises and a pressure peak appears, then the overflow valve is conducted, the oil is guided out along the overflow valve, and the pressure in the system is reduced to the set pressure of the overflow valve; water hammer waves and rectangular waves of various waveforms and frequency bands can be generated by adjusting the diameter of a variable damping hole of the one-way throttle valve and the rotating speed of the motor, so that the hydraulic pulse test bed can form hydraulic pulse waveforms of various waveforms and frequency bands; the set pressure of the overflow valve is increased, meanwhile, the travel switch loses efficacy, and when the reversing valve is located at the right position all the time, a damage test can be conducted on the hydraulic pipeline to measure the maximum pressure value capable of being borne by a tested piece.

The invention discloses underwater throttle valve element lowering and recycling equipment and a using method, and relates to the technical field of underwater oil extraction, the underwater throttle valve element lowering and recycling equipment comprises a guide protective cover, an ROV connector, a mounting plate, a lifting mechanism, a hanging ring, a butt joint assembly, an insertion cylinder and a locking assembly, and the guide protective cover is mounted on a valve body; the ROV interface is mounted at the top of the valve core; the lifting mechanism is mounted on the top surface of the mounting plate, and the telescopic end of the lifting mechanism extends downwards and penetrates through the mounting plate; the lifting ring is fixedly connected to the top end of the fixed end of the lifting mechanism so as to be connected with lifting equipment. The butt joint assembly is mounted below the mounting plate; the insertion cylinder is fixedly connected with the lifting end of the lifting mechanism, and the angle of the mounting plate can be adjusted under the guidance of the guide shield, so that the butt joint assembly is inserted into the ROV interface; the locking assembly is installed on the installation plate and can enable the butt joint assembly inserted into the ROV connector to be locked with or disengaged from the ROV connector, the structure is simple, use is convenient, and lowering and recycling work of the underwater throttle valve element can be efficiently and accurately completed.

A two-stage gas generator for ejection comprises a barrel, a first gas generation assembly and a second gas generation assembly. The first gas generation assembly comprises a first igniter, a first rupture disk and a throttling valve. The second gas generation assembly comprises a second igniter and a second rupture disk. The first igniter comprises an electric detonator I which is used for blasting the first rupture disk to enable high-pressure inert gas in the barrel body to sequentially flow through a third gas guide hole in the throttling valve, the position of the first rupture disk and a first gas guide hole in the first igniter to enter a working chamber in the launching barrel; the second igniter comprises a second electric detonator which is used for blasting the second rupture disk to be matched with the first igniter so that the remaining high-pressure inert gas in the barrel can enter the working cavity in the launching barrel through the position of the second rupture disk and a second gas guide hole in the second igniter. The device can meet the initial low overload requirement of a launched object in the takeoff stage and the cylinder outlet speed requirement in the middle and later periods, is simple in structure and light in weight, and a generated pushing air source is clean and free of residues and cannot expose a launching point.

The invention discloses an integrated rigidity damping inerter self-control type two-stage vibration reduction hydro-pneumatic suspension and a working method in the field of automobiles, a hollow plunger extends into an upper cavity of an oil cylinder, the lower end of the hollow plunger is fixedly connected with a piston, and an upper lifting lug runner is sequentially connected with an inerter pipe, an electric control throttle valve and a large hydro-pneumatic chamber through a first hydraulic oil pipe; a lower lifting lug runner is sequentially connected with a damper and a small oil gas chamber through a second hydraulic oil pipe, a built-in rigidity control valve outer cylinder with the lower end fixedly connected with a piston is arranged in the plunger, an inner cylinder with the upper end sealed and the lower end connected with the lower lifting lug through a spherical hinge is coaxially sleeved with the outer cylinder, and three rows of holes are formed in the side wall of the inner cylinder from bottom to top. Two rows of holes are formed in the side wall of the outer cylinder from bottom to top; the flow direction of oil liquid is changed when the suspension works, a seal does not need to be arranged on a piston, a longer oil through hole is formed in an outer barrel, the safety of the control valve is improved, a wheel dynamic vibration absorber is integrated to an oil cylinder, integration is achieved, an external rigidity control valve is replaced with an internal rigidity control valve, and the size of the whole suspension is reduced.

To early activate a catalyst of a three-way catalyst device for purifying exhaust gas of an internal combustion engine, in a power device including the internal combustion engine using ammonia and ignition fuel as fuel.SOLUTION: A power plant 10 comprises a turbocharger 26 that turbocharges intake air of an internal combustion engine 12 to increase an intake pressure, and a throttle valve 24 that narrows a flow path of an intake pipe 22. When a catalyst in a three-way catalytic device 44 is inactive, a wastegate valve 50 of the turbocharger 26 is opened, or in addition, an intake flow path is narrowed by the throttle valve 24, to lower the intake pressure compared to that in normal time. The lowering of the intake pressure reduces a heat capacity of materials in a cylinder, increases a combustion temperature, and increases an exhaust temperature. High-temperature exhaust gas increases a temperature of the catalyst early, to accelerate activation.SELECTED DRAWING: Figure 1

The invention relates to a natural gas liquefaction process using supersonic velocity spray pipe precooling. The system comprises a pre-cooling unit, a deep cooling unit, a heat exchange unit and a natural gas liquefaction unit. The pre-cooling unit comprises a supersonic spray pipe and a throttle valve; the cryogenic unit comprises a throttle valve, a compressor, a cooler, a component distributor and a mixer; the heat exchange unit comprises a heat exchanger; the natural gas liquefaction unit comprises a throttle valve and a separator. According to the production process, the technical scheme of supersonic spray pipe precooling and mixed refrigerant circulating cryogenic cooling is adopted. Compared with other processes, the process has the advantages of low refrigerant consumption, low energy consumption, high natural gas liquefaction rate, low process complexity, low equipment investment, good environmental protection benefit and the like under the same condition, and can efficiently recover the natural gas condensate (NGL) while precooling.

The invention provides an ammonia flash steam reliquefaction system for realizing cold energy supply, the reliquefaction system comprises an ammonia fuel cabin, an ammonia gas storage tank, a compressor, a condenser pipe, a cooling tank and other devices which are connected in sequence, ammonia gas flowing out of the ammonia fuel cabin is converted into high-pressure liquid ammonia after being compressed and condensed, and the high-pressure liquid ammonia is divided into three branches after flowing out through a cold heat exchanger, the first branch flows into the cooling tank after being depressurized and cooled by the high-pressure throttle valve, so that the interior of the cooling tank is cooled; the second branch is depressurized and cooled by a refrigeration storage throttle valve and then enters a liquid ammonia evaporator in the refrigeration storage, so that the refrigeration storage is cooled; and the third branch flows back to the ammonia fuel cabin after being depressurized and cooled by a back-to-cabin throttle valve. And meanwhile, the liquid ammonia in the cooling tank is also used for cooling the refrigerant water, so that the refrigeration of a user room is realized. According to the reliquefaction system, cold energy contained in high-pressure liquid ammonia in the reliquefaction process is fully utilized, different refrigeration schemes are made according to the refrigeration house and the user room, and the whole pipeline design is more reasonable.

The invention discloses a throttling well killing control method and system, a storage medium and a program product, and relates to the field of intelligent control. According to the application, the control system collects wellhead pressure, casing pressure, throttle valve opening and shaft temperature gradient data; comparing the shaft temperature gradient data with a preset temperature reference curve to obtain a temperature deviation sequence, and performing Fourier decomposition on the temperature deviation sequence to obtain a main frequency component; on the basis of the main frequency component and a preset frequency threshold value, downhole flow situation parameters are determined, and a pressure dynamic compensation function is established according to the downhole flow situation parameters; the wellhead pressure and the casing pressure are input into the pressure dynamic compensation function, and the corrected wellhead pressure and the corrected casing pressure are obtained; and on the basis of the corrected wellhead pressure, the corrected casing pressure and the throttle valve opening, the throttle valve opening adjusting amount is calculated, the throttle valve is controlled to be adjusted according to the throttle valve opening adjusting amount, and therefore the reliability and accuracy of throttle well killing control are improved.

The invention provides a PID control method and device based on variable shunting and an air conditioner, and is applied to the field of air conditioner control. The method comprises the steps that in the operation process of the air conditioner, whether the current environment temperature meets the limiting temperature condition or not is judged; under the condition that the current environment temperature meets the limiting temperature condition, the target control strategy is executed circularly till the current environment temperature reaches the set temperature; the target control strategy comprises at least one of the following items: performing PID control on the operation frequency of the compressor and the valve opening of the throttle valve, changing the flow dividing mode of the flow divider, and performing PID control on the rotating speed of the fan. According to the PID control method and device based on variable shunting and the air conditioner, through the mode of combining variable shunting and PID control, the air conditioner can maintain the indoor environment temperature within the temperature range set by the user under the severe working conditions of ultra-high temperature and ultra-low temperature.

The invention discloses a material distribution system of a drying machine, and belongs to the technical field of liquid drying, the material distribution system comprises a rack group and a material distribution system, the rack group is in bolted connection with two main shaft groups, the outer side parts of the two main shaft groups are respectively provided with a pipeline function processing group, a scraper blanking group is arranged between the two main shaft groups, and the rack group is in bolted connection with a spray pipe scraper plate group. A protective cover metal plate set is arranged on the outer side of the rack set, the spray pipe scraper set comprises four sets of throttle valve spray pipe fixing seats fixedly installed on the rack set through bolts, the four sets of throttle valve spray pipe fixing seats are connected with the rack set through hexagon socket cap screws, and a set of speed regulating valves is fixedly installed on each set of throttle valve spray pipe fixing seats through bolts. The front end of each set of speed regulating valve is connected with a material distributing pipe through a pipe thread reducer union, a liquid nozzle is arranged at the end of each material distributing pipe, finally atomized liquid is sprayed out through the liquid nozzles, it is ensured that the device can dry and solidify different kinds of liquid in a proper state, and high-quality powder is obtained.

The invention provides an ultrahigh pressure gas well ground throttling depressurization pilot production system, which belongs to the technical field of gas well pilot production, and comprises a gas production tree, a pressure test kill manifold sledge, a cyclone desander sledge, a first-stage oil nozzle manifold sledge, a second-stage electric cage throttling valve, a third-stage electric cage throttling valve, an instrument flange, an isolation flat valve and a wellhead pressure release blowout system, the pressure test well killing manifold sledge achieves pressure test of all high-pressure equipment and has the well killing function in the well emergency situation, the cyclone desander sledge can protect all levels of throttling valves and downstream production equipment against erosion, and the service cycle of the throttling valves and the downstream production equipment is prolonged. The fixed oil nozzle and the electric cage type throttle valve are connected in parallel through the first-stage oil nozzle manifold sledge, a production system can be accurately established, and the first-stage electric cage type throttle valve can be replaced and maintained without closing a well.

The invention provides an in-cylinder braking power control method and device, a diesel engine and a diesel locomotive, and relates to the technical field of engines. The in-cylinder braking power control method comprises the steps that an activation result is obtained; when the activation result indicates that the in-cylinder braking function of the diesel engine is activated, the initial opening degrees of a supercharger bypass valve and an air inlet throttle valve and the initial inter-cooling post-pressure jointly corresponding to the initial opening degrees of the supercharger bypass valve and the air inlet throttle valve are obtained according to rack calibration data of the diesel engine; and when the initial post-intercooling pressure is not equal to the preset expected post-intercooling pressure, the initial opening degree of the supercharger bypass valve and / or the air inlet throttling valve is adjusted in a closed-loop mode, and the respective corrected opening degrees of the supercharger bypass valve and the air inlet throttling valve are obtained till first corrected post-intercooling pressure jointly corresponding to the respective corrected opening degrees is equal to the expected post-intercooling pressure. The problem that a diesel engine breaks down or is damaged or scrapped due to the fact that the braking power is not adjustable in the braking process in the existing in-cylinder braking technology can be solved.

According to the equipment and the method, hydrogen is pre-cooled with a mechanical low-temperature pre-cooling cycle and a helium cycle through a first-stage heat exchanger, is subjected to ortho-secondary conversion through a second heat exchanger, a fourth heat exchanger and a fifth heat exchanger, and is subjected to heat exchange with cold helium discharged from a first turbo expander in the helium cycle; and liquid hydrogen generated after the liquid hydrogen enters the liquid hydrogen throttling valve to be throttled enters the liquid storage tank, and the hydrogen liquefaction process is completed. Helium entering and exiting the helium circulation low-temperature compressor unit is subjected to mechanical low-temperature precooling, the compression work is reduced through helium low-temperature compression, the expansion work is recycled through the turbo expander, and the thermodynamic efficiency of the system is improved; the hydrogen liquefying system only depends on the cooling capacity provided by the helium circulating system and the mechanical low-temperature pre-cooling circulating system, hydrogen liquefying can be completed without compression, and the system safety is improved; the helium circulation low-temperature compressor unit and the mechanical low-temperature compressor both adopt oil-free gas suspension centrifugal compressors, so that the problems of oil removal and oil return are avoided, and the reliability is remarkably improved.

The invention discloses a refrigeration house refrigerating system, a defrosting control method and device of the refrigeration house refrigerating system and a storage medium. The system comprises a medium-temperature heat accumulator filled with a first phase change material; the low-temperature heat accumulator is connected with the medium-temperature heat accumulator and is internally filled with a second phase-change material of which the phase-change temperature is lower than that of the first phase-change material; an air cooler; the evaporator is respectively connected with the air cooler and the low-temperature heat accumulator through a throttle valve; the defrosting heater abuts against the surface of the evaporator and is connected with the medium-temperature heat accumulator and the low-temperature heat accumulator; one end of the compressor is connected with a heat exchange pipeline of the medium-temperature heat accumulator and the air cooler through a three-way reversing valve, the other end of the compressor is connected with the evaporator, and the low-temperature heat accumulator, the medium-temperature heat accumulator, the solution pump and the defrosting heater sequentially form a loop. By means of the two heat accumulators made of the phase change materials with different phase change temperatures, wide-temperature-range exhaust waste heat of the compressor is absorbed, meanwhile, the evaporator is defrosted in a graded mode through the two stages of heat accumulators, and the energy consumption of the system is reduced.

The present disclosure provides embodiments of a monobore assembly to be positioned in a hydraulic fracturing manifold system to provide overpressure relief and bleed using choke valves. The monobore assembly includes a control module, a pressure relief choke valve, a pressure transducer, and a bleed choke valve. The control module has a controller configured to receive a pressure signal, from the pressure transducer, and upon determination the pressure is above a predetermined threshold, send an output action to relieve the pressure in a throughbore of the monobore assembly. The pressure relief choke valve is configured to receive the output action and open in less than 0.4 seconds, thereby to prevent damage from overpressure within a throughbore of a first monobore junction. The bleed choke valve is also configured to receive the output action to controllably evacuate pressure, or pressurized fluid, within a throughbore of a second monobore junction.

The invention discloses a design method of a pressure control throttle valve with the pressure drop linearly changing along with the stroke, and belongs to the technical field of automation of oil and gas exploitation equipment.The design method comprises the following steps that the linear relation between the pressure drop and the stroke of the throttle valve serves as a target; a mathematical model of a valve element contour is established by establishing a minimum throttling area equation of a cylindrical valve and a wedge-shaped valve, correcting a flow pressure drop characteristic equation and deducing a differential pressure linear adjustment equation, a valve element contour curve meeting the linear requirement is deduced through variable-diameter contour optimization design, and therefore the valve element structure of the throttling valve is obtained. By means of the design method, the valve element contour curve with the wider linearity range of pressure control adjustment and the better precision can be obtained, and the design method is more efficient and universal.

The invention relates to the technical field of oil production wellhead devices, and discloses an oil production wellhead device capable of automatically adjusting flow, which comprises a casing head, a tubing head, a Christmas tree and a controller which are sequentially mounted at the top of a wellhead, the Christmas tree comprises an adjustable throttle valve, the adjustable throttle valve comprises a valve body and a valve cover, a valve seat is mounted in the valve body, and the valve cover is mounted on the valve seat. A sealing filler is installed in the valve body, a valve rod is slidably connected to the interior of the valve deck, a valve element is fixedly connected to the bottom of the valve rod, an annular groove is formed in the middle of the sealing filler, a liposuction sponge sleeve is arranged in the annular groove, L-shaped grease adding pipes are symmetrically arranged on the outer portion of the liposuction sponge sleeve, and a grease adding mechanism is arranged in the valve deck. When the valve rod linearly moves up and down to change the opening degree between the valve element and the valve seat, the annular piston can move downwards to extrude lubricating grease in the annular grease storage cavity to achieve self-lubrication of the valve rod, and therefore dynamic friction between the valve rod and sealing filler can be reduced.

The invention discloses a vacuum exhaust throttle valve setting method and system. The method comprises the steps that the current pressure value in a vacuum pipeline is obtained; calculating a pressure deviation and a pressure deviation change rate according to a preset target pressure value and the collected current pressure value; fuzzifying the calculated pressure deviation and the pressure deviation change rate to obtain a corresponding fuzzy linguistic variable; performing fuzzy reasoning based on a preset fuzzy rule base to obtain a valve opening adjustment amount in a fuzzy form; performing defuzzification processing on the valve opening adjustment amount in the fuzzy form to obtain an accurate valve opening adjustment amount value; and the opening degree of the exhaust throttle valve is adjusted according to the accurate valve opening degree adjustment amount value. The opening degree of the exhaust throttle valve is dynamically adjusted, and rapid and accurate control is achieved.