858 results about "Liquid pressure" patented technology

The invention relates to the technical field of energy storage management, in particular to a high-energy-density liquid cooling energy storage system based on thermal management optimization, which comprises a thermal response calculation module, a thermal risk area identification module, a cooling resource allocation module, a thermal decoupling state judgment module and a charging and discharging power limiting module. According to the method, the inlet temperature, the outlet temperature and the cooling liquid flow speed of the high-energy-density energy storage equipment are obtained, the unit thermal load conversion rate is calculated, the unit thermal response deviation degree is determined, the thermal risk area higher than the standard limit is clearly recognized in the energy storage equipment, the corresponding liquid cooling channel is accurately selected, and the cooling liquid pulse flow frequency is optimized; the pertinence and timeliness of the cooling liquid in actual use are effectively improved, the local overheating hidden danger is avoided, the lag response is marked in time by monitoring the cooling liquid pressure difference and the temperature rise change in real time, the decoupling state between the cooling liquid and the thermal load is judged, the charge and discharge power dynamic reduction measure is implemented, and the trend of abnormal and continuous accumulation of the local thermal load is restrained.

The invention relates to the technical field of casting equipment, and discloses energy-saving furnace roller automatic cooling mold opening casting equipment which comprises an upper mold, a lower mold, an upper locking assembly, a lower locking assembly and a jacking assembly. After casting is completed, cooling liquid is continuously input into the water inlet, the outlet of the lower die cooling cavity is blocked by the sealing column, the cooling liquid is gradually accumulated in the closed lower die cooling cavity, the liquid pressure is gradually increased in a stable and controllable trend, and along with continuous increase of the pressure, the sealing plate is subjected to thrust from bottom to top, so that the sealing effect is improved. When the sealing column moves to the limiting plate, the sealing column is pushed to move upwards, in the process, the liquid pressure is not instantly exploded but is gradually increased, damage of impact force to the mold is effectively avoided, after the sealing column moves to the limiting plate, the rising pressure can push the upper mold to stably rise, and automatic mold opening is achieved. According to the mode that the liquid pressure gradually rises to complete mold opening, an additional power device is not needed, the maintenance difficulty is lowered, and meanwhile a large amount of energy consumption is saved.

The invention discloses a gas lift reverse circulation drilling starting pressure and circulation gas supply pressure calculation method. The method comprises the following steps that S1, hydrostatic pressure of the bottom of an inner pipe of a double-wall drill rod is calculated; s2, calculating the friction loss pressure of compressed air of an outer annulus of the double-wall drill rod; s3, calculating the friction loss pressure of the compressed air flowing through the earth surface gas transmission channel; s4, calculating the local pressure loss of the compressed air passing through the orifice in the gas-liquid mixer from the outer pipe of the double-wall drill rod; s5, calculating the liquid phase flow friction pressure loss of the inner pipe of the double-wall drill pipe; s6, calculating the liquid-phase flow friction pressure loss of the deslagging pipeline; s7, calculating the three-phase flow pressure drop of the inner pipe of the double-wall drill pipe; and S8, the starting pressure and the circulating air supply pressure are calculated. According to the method for calculating the starting pressure and the circulating gas supply pressure of the gas lift reverse circulation drilling, the starting pressure and the circulating gas supply pressure of the gas lift reverse circulation drilling can be accurately and conveniently calculated by accurately calculating the pressure of each part of the gas lift reverse circulation drilling process, and a theoretical basis is provided for stable and efficient operation of a circulating system.

An active control safety overflow valve is provided with a driving assembly and a pressure sensor, a servo motor is arranged in the driving assembly, and the pressure sensor is used for collecting the pressure of liquid in the overflow valve and controlling the servo motor to act; the servo motor acts to drive the overflow valve to act, and the overflow valve is actively controlled to be opened or closed; the safety overflow valve has the advantages of being accurate in pressure control, capable of achieving self-recovery and high in response speed, the defects of an existing safety overflow valve for shale oil exploitation fracturing are overcome, and the safety and continuity of shale oil exploitation fracturing production are guaranteed.

The invention relates to the technical field of hydrometallurgy production systems, in particular to a solvent regeneration control system for separating zirconium and hafnium through MIBK method centrifugal extraction, which comprises a control module used on a solvent regeneration neutralization reactor, and the control module comprises a heat exchange module; the heat exchange module comprises a heat exchange unit; the heat exchange unit comprises a cooling liquid flow adjusting unit, a cooling liquid temperature detecting unit and a cooling liquid pressure detecting unit. And the heat exchange module is used for controlling the flow of the cooling liquid, the pressure of the cooling liquid and the temperature of the cooling liquid of the heat exchange unit so as to adjust the temperature of the mixed phase in the neutralization reactor. The control system can monitor the flow, temperature and pressure of cooling liquid in real time, accurately control opening, closing and temperature adjustment of the heat exchange unit, quickly respond to temperature change of a mixed phase in the neutralization reactor, remove reaction heat in time, effectively avoid the problem of extraction system emulsification caused by high-temperature decomposition and polymerization of thiocyanic acid in the solvent regeneration process, and improve the extraction efficiency. The solvent regeneration efficiency and quality are ensured.

The utility model relates to the technical field of regulating valves, and discloses a self-operated high-pressure-difference regulating valve which comprises a pipeline assembly and a buffer assembly installed in the pipeline assembly, the pipeline assembly is fixedly installed on the two sides of a valve assembly, a transmission assembly is fixedly installed on the valve assembly, a feedback assembly is fixedly installed on the transmission assembly, and when equipment operates, the buffer assembly is fixedly installed on the pipeline assembly. Water flow passes through the water pipe and flows into the valve assembly, in the process, the liquid baffle is driven by high pressure to rotate and deviate inwards along the rotating rod, meanwhile, the liquid baffle is driven to rebound to the original position under the rebound effect of the rebound spring, part abrasion caused by a water hammer is avoided, meanwhile, liquid pressure is conducted to an inner cavity of the piston cylinder through the communicating pipe, and the valve element and the valve rod are driven to be pressed downwards; in the downward pressing process, the through hole in the communicating position of the through groove and the valve element is gradually reduced, and therefore flowing hydraulic pressure is adjusted more smoothly and stably.

The invention relates to the technical field of methyl alcohol fuel injection system injectors, in particular to a high-pressure-difference methyl alcohol injector for a ship engine, which comprises a gland, an electromagnetic valve assembly, a shell, an ejector rod, a spring, a range limiting disc, a valve body, a valve core bushing, an orifice plate and a valve seat. According to the methanol injector, the fuel inlet is laterally arranged, and the overall flow direction of fuel is side-in and bottom-out, so that the leakage phenomenon possibly caused by insufficient coaxiality of external pipe joints in a conventional fuel jacking installation mode is avoided, and the sealing of an engine cannot be influenced even under severe working conditions such as continuous vibration; according to the methanol injector, methanol supply pressure (hydraulic pressure) is used for assisting in opening of the valve element of the methanol injector, compared with an injector with a conventional direct-drive electromagnetic valve opening valve element, the structure can achieve opening of the methanol injector only through smaller electromagnetic force and lower power consumption, and higher methanol injection pressure can be achieved after the spring and the supply pressure are accurately matched; and more efficient atomization can be realized.

The invention relates to the technical field of cutting machines, and discloses an automobile part machining cutting machine which comprises a cutting angle change type control mechanism and a thread type cutting position adjusting mechanism. The movable disc is fixedly installed on the inner rotating ball body, the vertical movable frame is fixedly installed on the top of the movable disc, the horizontal threaded rod can drive the vertical movable frame to move directionally during rotation, and the limiting sliding rod can prevent the movable disc from angle change relative to the horizontal threaded rod. According to the cutting machine for machining the automobile parts, by means of the multi-space-angle rotation capacity of an inner rotating ball body in a hollow ring body, a rotating disc cutter can generate a larger-range cutting angle relative to the parts, so that the applicability of the cutting machine in the cutting angle is improved, in addition, the device achieves the cutting angle locking function through liquid pressure, and the cutting efficiency is improved. And a stable work control function is realized.

To keep control accuracy even when continuously used for a long period of time.SOLUTION: A control device 100 includes: a liquid pressure transmission tube 108 that transmits pressure via liquid to a piston 902 that drives a joint portion 901 of a work device (robot 900); pressure application means (pump 110) that applies the pressure to the liquid; a pressure gauge 104 that measures a pressure value of the liquid; a flow meter 103 that measures a flow rate value of the liquid; a tube deformation correction unit 106 that calculates a flow rate fluctuation value of the liquid according to the pressure value of the liquid using a tube deformation parameter prepared in advance and corrects the flow rate value of the liquid; a joint angle estimation unit 105 that estimates a joint angle from the corrected flow rate value, and a parameter calibration unit (tube deformation parameter calibration unit 120) that calculates a current tube deformation amount from a measurement value of the flow rate value before start of pressure application and a measurement value of the flow rate value after the end of the pressure application and calibrates the tube deformation parameter.SELECTED DRAWING: Figure 1

The utility model discloses a testing machine for testing the sealing performance of a sealing pair of a control valve, which comprises a closed box body, a rotary driving mechanism, a rotary lifting assembly, a lower sample replacement block, a telescopic cylinder, an upper sample replacement block, a liquid pressure supply system and a gas pressure supply system, and the rotary driving mechanism is arranged in the closed box body; the rotary lifting assembly is located in the closed box and is in transmission connection with the rotary driving mechanism. The lower sample replacement block is mounted at the top of the rotary lifting assembly; the telescopic cylinder is mounted in the closed box body and is connected with the rotary lifting assembly; the upper sample replacement block is mounted at the top of the closed box body and corresponds to the lower sample replacement block; the liquid pressure supply system is connected and communicated with the sealed cavity of the upper sample replacement block; the gas pressure supply system is aligned with a sealing interface formed between the upper sample replacement block and the lower sample replacement block; and the leakage detection system is electrically connected with the data acquisition and control system. The device can improve the applicability, quantify the sealing leakage rate of the valve, and comprehensively evaluate the sealing performance of the control valve.

The invention relates to an air compression energy storage method and system based on liquid pressure control, which can improve the energy storage capacity of compressed air energy storage under the condition that the volume of an underground cavity is not increased by means of the action of liquid for pressure control in the underground cavity. The technical problems that in the prior art, the energy storage capacity can only be improved by increasing the size of the underground gas storage cavity, and site selection is difficult and cost is high when the size of the underground gas storage cavity is increased are solved. Moreover, the liquid is injected into the underground cavity, so that the pressure of the underground cavity is kept stable in the energy storage and release processes, on one hand, the energy storage capacity is improved, and on the other hand, the influence of pressure circulation fluctuation on the integrity of the underground cavity is reduced.

The invention relates to the technical field of vehicle-mounted visual perception, in particular to a camera active anti-shake cooling system based on a magnetorheological fluid medium and a control method. The heat dissipation system comprises a camera module, at least three independent pipelines which are arranged around the camera module and are hollow inside, a hydraulic driving unit, at least one electromagnetic coil which is arranged on the outer wall of the independent pipeline and is used for generating a controllable magnetic field, and a controller, the controller is used for cooperatively controlling the liquid pressure in the pipeline and the magnetic field intensity acting on the magnetorheological fluid according to the vehicle state information and / or the posture information of the camera module so as to achieve active anti-shake and heat dissipation of the camera module. The pressure of the cooling liquid in the pipeline is adjusted to support the camera and change the electromagnetic force between the magnetic fluid and the coil by changing the magnetic field intensity, and lens shaking is reduced in cooperation with a vehicle body active shock absorption system.

The invention discloses a quality inspection and early warning system for impregnated paper production, and relates to the field of quality inspection and early warning for impregnated paper production, and the method comprises the steps: directly measuring the real liquid pressure intensity of a paper immersion area through an impregnation parameter collection module, and generating a dynamic pressure intensity deviation in combination with the theoretical pressure intensity calculated by a dynamic pressure intensity calibration module; the valve opening reference value is matched based on the dynamic pressure deviation, the solvent flow is corrected in real time in combination with the liquid level change rate, and the precipitation risk is evaluated by analyzing the concentration reduction amplitude after solvent supplementation and the duration required by solution stabilization; when the risk reaches an activation condition, triggering an anti-precipitation instruction, according to the anti-precipitation instruction, linking a stirrer to stir in a production intermittent period, and injecting a solute to ensure that the concentration reaches the standard; and recording the water level adjusting time length, the concentration compensation time length and the instruction response time length, triggering graded alarm when time is out, and outputting an interrupt reset instruction to a corresponding adjusting module. And the quality control level in the impregnated paper production process is improved.

The invention discloses a concentric double-pipe continuous negative pressure sand washing device and process. The device comprises a pump truck and a sand washing pipe column structure. The pump truck is used for providing sand washing liquid pressure and displacement for the sand washing pipe column structure; the sand washing pipe column structure comprises a concentric double pipe column, a process pipe, a negative pressure injection pump and a sand washing nozzle. A process pipe; wherein an annular liquid return channel is formed between the outer-layer oil pipe of the concentric double-pipe column and the inner-layer oil pipe of the concentric double-pipe column; a negative-pressure injection pump and a sand washing nozzle are mounted at the bottom of the inner-layer oil pipe; the sand washing fluid shunting channel is divided into two channels; one part of sand washing fluid enters the well bottom through the self-sealing well mouth and the inner-layer oil pipe in sequence, and the sand washing fluid makes contact with the sand surface of the well bottom through the sand washing nozzle; and the other part of the sand washing fluid generates negative pressure through the negative pressure injection pump to discharge the formation produced fluid and mixed fluid of the sand washing fluid and shaft sand grains out of the ground through the annular fluid return channel and the process pipe, and through the concentric double-pipe structure and the negative pressure injection pump, internal circulation of the sand washing fluid and continuous negative pressure sand washing are achieved.

The embodiment of the invention provides an immersed liquid-cooled battery pack, which comprises a battery box shell, the battery box shell comprises a liquid-cooled bottom plate, a top plate, a side plate and a partition plate, a closed space is defined by the liquid-cooled bottom plate and the top plate, and the partition plate divides the closed space into a medium oil area and a functional dry area, the medium oil area is used for filling an immersion medium; the battery module is positioned in the medium oil area and is arranged on the liquid cooling bottom plate; the cooling pipe assembly is arranged on the side, away from the liquid cooling bottom plate, of the battery module, and the cooling pipe assembly and the liquid cooling bottom plate are both used for being filled with a cooling medium. And the immersion medium is sealed in the battery pack and is static, so that the leakage problem caused by the flowing of the immersion medium in a pipeline and the problems of local flowing dead zone, turbulence and inconsistent liquid pressure caused by the flowing of the medium are avoided, the heat dissipation area is increased, and the heat exchange capability of the battery is enhanced.

The invention belongs to the technical field of automobile shock absorber electromagnetic valves, and particularly relates to a hydraulic shock absorber electromagnetic valve for vehicle testing. A backflow channel communicated with an overflow cavity and a pressurizing cavity is arranged on a partition plate, a one-way valve leading to the pressurizing cavity is arranged on the backflow channel, so that oil flowing into the overflow cavity flows back into the pressurizing cavity to react on a pressurizing seat, and the oil in a main liquid cavity needs to have higher pressure when the pressurizing seat is pushed away from a main valve body; and the oil liquid pressure difference between the liquid inlet and the liquid outlet is further increased, the damping force of the oil liquid in the electromagnetic valve is increased, and the vibration reduction performance of the vibration damper is improved. Compared with an electromagnetic valve of a shock absorber in the prior art, when the power-on amount of the electromagnetic coil is certain, the electromagnetic valve provides larger damping force for the vehicle shock absorber; on the contrary, when the damping force needed by the vehicle shock absorber is fixed, the electromagnetic valve consumes less electric energy, the number of times of vehicle charging in the vehicle driving evaluation test process is reduced, the vehicle research and development test efficiency is improved, and electric energy is saved.

The invention discloses an inner circle surface cluster magnetic jet polishing device and method, and belongs to the technical field of polishing equipment.The magneto-rheological polishing and jet polishing are combined, that is, magneto-rheological polishing liquid is jetted out of a liquid outlet of a cluster magnetic jet polishing head at a high speed under the high-pressure effect, efficient jet rough polishing is conducted on the inner circle surface of a workpiece, and the inner circle surface is polished. And meanwhile, under the action of the magnetic field, the magnetorheological polishing liquid is converted into a magnetorheological polishing pad and a flexible clamping abrasive for secondary fine polishing, so that the problems of workpiece deformation and poor surface quality easily caused by traditional honing and polishing are solved, the defect of low efficiency of single magnetorheological polishing is overcome, and the polishing efficiency and the surface quality are improved. Besides, the device can adapt to workpieces with different diameters by replacing cluster magnetic jet polishing heads and workpiece discs with different sizes, and the machining requirements of the workpieces made of different materials are met by matching with adjustable polishing liquid pressure, flow and rotating speed parameters; due to the expanded double-station design, the machining efficiency is improved, and the machining requirements of high-quality inner circle surface parts are met.

The invention provides a lead bonding and packaging device and a lead bonding and packaging method for a key process for packaging a deep cavity lead of an immersion type miniature liquid pressure sensor. The lead bonding packaging equipment comprises a rack, a movement mechanism mounting plate, an X-axis movement mechanism, a Y-axis movement mechanism, a first Z-axis movement mechanism and a second Z-axis movement mechanism, the movement mechanism mounting plate, the X-axis movement mechanism, the Y-axis movement mechanism, the first Z-axis movement mechanism and the second Z-axis movement mechanism are all mounted on the rack, a clamping mechanism is mounted on the X-axis movement mechanism or the Y-axis movement mechanism, and a visual microscopic mechanism is mounted on the first Z-axis movement mechanism. And a chopper positioning mechanism is mounted on the second Z-axis movement mechanism. According to the technical scheme provided by the invention, the alignment accuracy and stability in the wire leading process can be ensured, the yield and consistency of deep cavity bonding are improved, manual intervention and operation errors are reduced, automation of the wire bonding process is realized, the bonding precision and stability are improved, and the method has relatively high practicability and popularization value.

The invention relates to the technical field of sampling devices, and discloses a water pollution monitoring and sampling device which comprises a piston type sampling mechanism, a controllable driving mechanism and a threaded rotating mechanism. According to the water pollution monitoring and sampling device, the fluidity of liquid and the liquid pressure type folding and closing function of the annular elastic gas film are utilized, the sampling opening can be automatically closed according to the amount of sucked sewage in the sampling process, the sampling opening can be automatically opened when sewage is discharged, a part for controlling opening and closing of the sampling opening does not need to be contacted in the whole process, and the sampling efficiency is improved. Therefore, the device has an active opening and closing function aiming at the sampling port, so that the stability of the device in the sample transportation process and the automation degree in the sampling process are improved.

The invention discloses a forming method suitable for a Laval type pipe, relates to the technical field of Laval type pipe machining and manufacturing, and innovatively combines two high-speed forming processes of electromagnetic forming and electro-hydraulic forming for Laval type pipe machining. Electromagnetic force can be utilized to realize rapid and uniform diameter shrinkage of the pipe, and damage caused by mechanical contact is avoided; according to the electro-hydraulic bulging, the pipe can be bulged according to a preset shape by accurately controlling the liquid pressure, and a good forming effect is achieved. The method is simple in experimental device, high in operability, high in energy utilization rate, high in forming speed and high in forming precision. In order to solve the technical problems existing in the production of the Laval type pipe, the forming characteristics of electromagnetic forming and electro-hydraulic forming are combined, a method of combining diameter shrinkage of a thin-wall pipe driven by pulsed magnetic field force and controllable bulging of electro-hydraulic forming impact force is provided, and efficient, accurate and low-cost machining of the Laval type pipe is achieved.

The invention is a universal blower attachment that will fit any standard handheld leaf blower or standard backpack blower and a system for atomizing and dispensing insecticides and other liquids, with an adjustable turn valve to adjust liquid pressure, allowing a pressurized tank to continually force liquid through one or more adjustable nozzles for continuous atomization and spraying into the exhaust stream of the leaf blower.

The invention discloses a valve assembly and a spaceflight propulsion system with the valve assembly, the valve assembly comprises a valve body, a valve core assembly and a reset piece, a mounting cavity, an inlet flow channel and an outlet flow channel are formed in the valve body, the inlet flow channel and the outlet flow channel are respectively communicated with the mounting cavity, and an inlet and an outlet which are respectively communicated with the inlet flow channel and the outlet flow channel are formed in the valve body; the valve element assembly is movably arranged in the mounting cavity, and the valve element assembly moves under the action of liquid pressure of the inlet flow channel so as to selectively connect or disconnect the inlet flow channel and the outlet flow channel; the reset piece is arranged between the valve element assembly and the inner wall of the mounting cavity so as to drive the valve element assembly to reset. Wherein a balance cavity is further defined between the valve element assembly and the mounting cavity, and a throttling channel for communicating the inlet flow channel with the balance cavity is formed in the valve element assembly. According to the valve assembly, the throttling channel is arranged, so that the buffering effect on liquid impact is achieved, and the valve assembly shows excellent reliability and durability under the high-pressure and high-frequency working conditions of an aerospace propulsion system and the like.

Pure liquid nitrogen, liquid air or dirty liquid nitrogen generated by a rectifying tower of the air separation device is subjected to secondary pressurization through a hydraulic pump and then enters a main heat exchanger or a recooling device to recover cold energy, and high-pressure gas formed by heat absorption and gasification enters a high-pressure expansion machine to expand and do work; exhaust gas of the high-pressure expansion machine enters the rectifying tower to provide cold energy required by air separation, and pure nitrogen, waste nitrogen and pure oxygen which are discharged from the rectifying tower and are subjected to cold energy recovery through the main heat exchanger are output. The purposes of energy conservation and consumption reduction of the air separation device are achieved through the processes of primary pressurization of the compressor, secondary pressurization of the hydraulic pump, cold returning, gasification and expansion.

The utility model discloses a catheter, particularly relates to the technical field of medical instruments, and solves the problems that when the existing catheter is blocked, medical personnel cannot be reminded, and workers need to distinguish the blocking condition in advance, so that the catheter is inconvenient to dredge, and the working efficiency is high. And the workload of medical staff is increased. The device comprises a tube body provided with a fixed balloon, a water injection tube communicated with the fixed balloon is arranged on the side wall of the tube body, a water injection valve is arranged at the end of the water injection tube, and a liquid pressure sensor is arranged in the water injection tube; a drainage cavity is formed in one end of the tube body; a liquid level sensor is arranged in the pipe body; the liquid level sensor is arranged between the drainage cavity and the water injection pipe; alarm reminding modules are arranged in the water injection pipe and the pipe body respectively. According to the device, when blockage occurs, medical staff are reminded, workers do not need to distinguish the blockage condition in advance, dredging work of the catheter is facilitated, and the workload of the medical staff is reduced.

The utility model discloses a magnetic field liquid pressure difference sealing performance-rheological property synchronous measurement system which comprises a rheometer main body, a sealing rotor structure, a pneumatic pressurizing device, a temperature control and measurement device and a computer measurement and control device, the pneumatic pressurizing device comprises a constant pressure pump and a gas storage bottle, and is connected with the sealing rotor structure through a vent hole in the shell; the temperature control and measurement device comprises a temperature controller and a temperature control execution module which is arranged on the side wall of an outer cylinder at one end, close to the magnetic liquid area, of the magnetic function unit; the computer measurement and control device is connected with the optical encoder, the pressure sensor, the temperature controller and the torque control type motor. The system can simulate and test the sealing effect and rheological property of the magnetic liquid in a static state and a dynamic state, explores the actual influence of the magnetic liquid on the sealing property when the magnetic liquid flows, and supports the rheological test under the condition of multi-field coupling of a flow field, a magnetic field and a temperature field.

To provide a foam agent addition device, a blowing foam formation machine, a foam agent addition method, and a foam body production method, capable of performing control not according to liquid pressure in a liquid channel, but according to a drive state of a liquid pump, for stably supplying a foam agent to liquid flowing in the liquid channel, without being impacted by any pulse of the liquid pump.SOLUTION: There is provided a foam agent addition device 10 for adding a foam agent E to liquid L1 which is supplied by a liquid pump 40 and flows in a liquid channel 30, and the foam agent addition device comprises: a pump drive detecting part 41 for detecting drive of the liquid pump 40; a foam agent container 11 for storing the foam agent E; a foam agent channel 12 for flowing the foam agent E supplied from the foam agent container 11; a foam agent measuring pump 50 for supplying a prescribed amount of the foam agent E to the liquid channel 12; an opening / closing valve 60 for controlling addition of the foam agent E to the liquid L1, by opening and closing; and an opening / closing valve control part 61 for controlling to open the opening / closing valve 60, according to a drive state of the liquid pump 40 detected by the pump drive detecting part 41.SELECTED DRAWING: Figure 1

The present invention discloses a differential pressure transmitter, which includes a pressure inlet seat and a sealing cover. The sealing cover is arranged on the pressure inlet seat. A diaphragm pressure sensor is arranged inside the sealing cover. A lead outlet is arranged at the top of the sealing cover. The diaphragm pressure sensor is connected with a signal lead, and the signal lead passes outwards through the lead outlet. A lead connector is wrapped on the signal lead, and the lead connector plugs in the lead outlet and is sealed with it. A negative pressure oil injection hole is also arranged on the sealing cover, and an oil plug is arranged in the negative pressure oil injection hole. When using the differential pressure transmitter of the present invention, when the internal pressure of the diaphragm pressure sensor is too high and it has a tendency to separate outwards, and the liquid pressure transmission medium in the installation cavity is not easily compressed, it can, to a certain extent, prevent the tendency of the diaphragm pressure sensor to separate, and adopts a suspension installation method, avoiding the abutment of the isolation diaphragm and / or the welding ring against the assembly part, and the isolation diaphragm will not be deformed during the installation process, solving the influence of clamping stress on the measurement accuracy.

The present invention relates to the field of valve bodies, and provides a ball valve and an assembly method thereof. The ball valve includes a valve ball, a valve body and an upper end cover plate. A valve shaft is configured on the valve ball. The ball valve further includes a sealing cover plate and a snap ring. The sealing cover plate is fixedly connected to the upper end cover plate and both are installed at the port of the valve body. The sealing cover plate abuts against the root of the valve shaft of the valve ball. A groove is provided on the inner wall of the valve body, and the snap ring is clamped in the groove. The part of the snap ring exposed outside the groove is clamped between the upper end cover plate and the sealing cover plate. In the ball valve provided by the present invention, the upper end cover plate and the sealing cover plate are fixedly connected, and the snap ring can limit the axial movement of the upper end cover plate and the sealing cover plate along the valve shaft. Compared with the traditional ball valve structure, the liquid pressure in the ball valve is finally borne by the snap ring, thereby effectively avoiding the liquid pressure in the ball valve from impacting the upper end cover plate and causing leakage due to poor sealing.

The utility model belongs to the technical field of gas compression devices, and provides a compressor blow-down device and a compressor, the compressor blow-down device comprises a liquid inlet pipe, a liquid outlet pipe and a blow-down pipe, the liquid inlet end of the liquid inlet pipe is in threaded connection with the blow-down pipe of the compressor; the pressure reduction assembly is provided with a liquid inlet and a liquid outlet, the liquid inlet of the pressure reduction assembly is connected with the liquid outlet end of the liquid inlet pipe, and the pressure reduction assembly is used for reducing the pressure of liquid; the liquid inlet end of the liquid outlet pipe is connected with the liquid outlet of the pressure reduction assembly. The compressor blowdown device and the compressor are simple in structure, reasonable in design and low in liquid pressure and flow speed during blowdown.

To provide a coating method for forming a thin hot-melt resin composition and a coating surface with no hole.SOLUTION: A hot-melt resin composition coating method includes a process in which a hot-melt resin composition heated so as to become a viscosity of 100 to 1,000 Pa s is discharged from a head part of a hot-melt resin composition discharge nozzle with a hydraulic pressure of 0.2 to 1.0 MPa by air, which is heated to an atomization temperature of -100 to +100°C relative to a heating temperature of the hot-melt resin composition, at a discharge rate of 0.04 to 0.1 g / sec.SELECTED DRAWING: None