80results about How to "Reduce pressure difference" patented technology

The utility model provides a sectional type water pressure adjusting device for a water-guided laser high-pressure water beam. The sectional type water pressure adjusting device comprises an air source input end, a water source input end, an air-liquid booster pump, an air control pressure reducing valve, an air pressure adjusting and controlling device, a first pressure sensor, a second pressure sensor and a controller. The multi-stage gradient continuous different driving water pressure intervals are arranged, driving water pressure gating use of the different water pressure intervals is matched according to the set water pressure, the pressure difference between the two ends of the pressure reducing valve is reduced, the service life of the pressure reducing valve is prolonged, drainage of water at a drainage opening is reduced, and the water utilization rate is increased; the stable high-pressure water beam output is generated by utilizing the multi-section water pressure output of the relative stable section of the booster pump and combining the real-time feedback of the water pressure and the air pressure regulation and control pressure relief and energy dissipation buffering, and the water pressure fluctuation range can be controlled within the preset range, such as within + / -0.5 MPa, so that the requirement of water-guided laser high-precision machining is met, and the water-guided laser machining efficiency is improved. And the processing efficiency and precision are improved.

The present invention relates to the field of glass physical tempering cooling, and specifically to a cooling air outlet mechanism for a glass tempering furnace. A cooling air outlet mechanism for a glass tempering furnace is provided, comprising a plurality of wind grille packages arranged up and down, the wind grille packages comprising a plurality of wind grille bars arranged in parallel, the wind grille bars being provided with air inlets, and a plurality of air outlets being provided on the side of the wind grille bars facing the roller of the tempering furnace, wherein the air outlets on each wind grille bar are arranged at intervals in the longitudinal direction, and the air outlets on two adjacent wind grille bars are arranged in a longitudinally staggered manner. By changing the arrangement of the air outlets on the wind grille bars, the longitudinal air outlets are also spaced apart like the transverse ones, and the longitudinal air outlet is intermittent and not distributed in a whole strip, thereby reducing the pressure difference of the wind force on the upper and lower surfaces of the glass plate, balancing the compressive stress on the upper and lower surfaces of the glass, making the wind pressure on the upper and lower surfaces of the glass more uniform, and greatly reducing the degree of bending of the four sides of the glass plate up and down, thereby effectively improving the problem of glass warping.

The embodiment of the invention relates to the technical field of corrosion resistance of test materials, in particular to a supercritical CO2 corrosion test system and a test method thereof. The supercritical CO2 corrosion test system comprises a sample loading device, a pressure regulating valve and an auxiliary pressure regulating part. The sample loading device is provided with a sample chamber for arranging a sample, and the sample chamber is also used for receiving the supercritical CO2 fluid, so that the sample in the sample chamber is subjected to a corrosion test under the supercritical CO2 atmosphere. The pressure regulating valve is arranged at the downstream of the sample chamber along the flowing direction of the supercritical CO2 fluid and is used for regulating the pressure of the sample chamber, so that a sample in the sample chamber is tested under a first preset pressure. The auxiliary pressure adjusting piece is used for increasing the pressure at the outlet of the pressure adjusting valve. By arranging the auxiliary pressure regulating part, the pressure difference between the inlet and the outlet of the pressure regulating valve is reduced, and the pressure of the sample chamber can be accurately regulated by the pressure regulating valve.

The invention discloses an autoclaved aerated concrete material and a preparation method thereof, and belongs to the technical field of novel building materials. The graphene oxide loaded calcium carbonate and the graphene oxide are added into the material provided by the invention, nucleation sites generated by the graphene oxide loaded calcium carbonate cause a deep microstructure of the material to directionally generate a fiber-like nanoneedle-shaped multi-stage micro-nano structure, and nanowires are split from tips of the nanoneedle-shaped structure and are filled in capillary pores and microscopic pores, so that the nanowires are uniformly dispersed in the micro-pores and the micro-pores; the appearance of a meniscus is effectively avoided, the compactness is increased, the pressure of capillary pores can be further dispersed by the nanowires, and the pressure difference of the capillary pores is reduced, so that drying shrinkage is avoided. The graphene oxide ions can reduce the gravitation between the colloidal particles and block the distance between the particles, so that drying shrinkage is further avoided. Therefore, the material provided by the invention can effectively solve the cracking problem caused by drying shrinkage, the durability of the material is improved, and the service life of the material is prolonged.

The utility model relates to a stop valve for conveying high-pressure steam, which comprises a valve body, a main valve seat is arranged in the valve body, a main valve clack is arranged on the main valve seat, a fixing sleeve is arranged on the outer side of the main valve clack, the fixing sleeve is connected with the main valve seat, an auxiliary valve seat is arranged in the main valve clack, an auxiliary valve clack is arranged above the auxiliary valve seat, and the auxiliary valve seat is attached to the auxiliary valve clack. First springs are arranged on the auxiliary valve seat and the auxiliary valve clack, a first through hole is formed in the fixing sleeve, a second through hole is formed in the portion, on the inner side of the first through hole, of the main valve clack, the first through hole is communicated with the inlet end of the valve body, an inner cavity of the auxiliary valve seat is communicated with the outlet end of the valve body, and the first through hole is communicated with an inner cavity of the auxiliary valve seat through the second through hole. A valve cover is arranged on the valve body and the fixing sleeve, a valve rod is arranged on the valve cover and the auxiliary valve clack, and a valve clack gland is arranged on the main valve clack. And the valve clack is difficult to separate from the valve seat to achieve a valve opening state. The utility model has the advantages of convenient use and wide market prospect.

The utility model discloses a handle assembly for a refrigerator. The handle assembly comprises a handle box defining a mounting space and comprising an opening; the ventilation device is arranged outside the handle box and comprises a first end and a second end, the first end is communicated with the interior of the refrigerator, and the second end penetrates through the handle box and is communicated with the mounting space; the door opening device comprises a plugging part and a handle which are connected, the plugging part is arranged in the mounting space and abuts against the second end, and the handle is arranged at the opening and can turn over relative to the opening; when the handle covers the opening, the blocking part abuts against the second end so as to block the second end. When the handle turns over towards the outer side of the handle box relative to the opening, the blocking part can be driven to move in the direction away from the second end, so that the blocking part is separated from the second end, and the mounting space communicates with the interior of the refrigerator. When the handle is pulled, the air pressure difference inside and outside the refrigerator can be reduced to assist door opening only by matching the plugging part with the second end, and the effect of assisting door opening is improved.

The invention relates to the technical field of desert planting, in particular to a desert greening project construction method which comprises the steps that desert soil is loosened, water-retaining agent injection and pH value adjusting operation are sequentially conducted on the desert soil, and vegetation planting is conducted after pit digging is conducted through a pit digging machine; the vegetation is fertilized, a water supply pipeline is established to irrigate the planted vegetation, and the vegetation is regularly maintained and monitored; respectively obtaining the survival number of the vegetation and the total planting number of the vegetation; determining the construction stability of the desert greening project based on the planting survival rate of the vegetation; if the construction stability does not meet the requirement, adjusting the fertilization period of the vegetation, or determining the growth resource supply effectiveness of the vegetation based on the pH value difference quantity of the desert soil at different depths; and if the growth resource supply effectiveness does not meet the requirement, adjusting the injection amount of the water-retaining agent. The construction stability of the desert greening project is improved.

The utility model discloses a powder anti-blocking weighing device which comprises a steel frame, a scale hopper, a gravity sensor, a sensor support, a dustproof connecting sleeve, a sealing cover, a pressure relief dust removal structure, a vibration mechanism, a feeding auger, a discharging pipe, an exhaust pipe and a feeding pipe. The scale hopper is arranged in the middle of the steel frame, a plurality of gravity sensors are arranged on the periphery of the scale hopper, the upper end of each gravity sensor is connected with the scale hopper, and the lower end of each gravity sensor is fixedly supported through a sensor support arranged at the corresponding position on the steel frame. The periphery of the sealing cover is fixedly supported on the steel frame, an exhaust port is formed in the middle of the sealing cover, a pressure relief dust removal structure is arranged in the exhaust port, the feeding pipe is connected with a discharging port of the feeding auger for feeding, and a plurality of vibration mechanisms are arranged on the periphery of the outer side wall of the lower end of the scale hopper. The anti-blocking device is simple in structure, capable of preventing the scale hopper from being blocked, and good in anti-blocking effect.

The utility model discloses an electric valve, an active suspension and a vehicle. The electric valve comprises a valve seat provided with a sliding groove; the valve element is arranged in the sliding groove and can slide along the sliding groove; the iron core is arranged on the first side of the valve seat, the valve element is arranged on the second side of the valve seat, and the iron core can drive the valve element to slide; a first balance hole is formed in the valve seat, the first end of the first balance hole is communicated with the gap between the iron core and the valve seat, the second end of the first balance hole is communicated with the gap between the valve seat and the valve element, and the gap between the iron core and the valve seat and the gap between the valve seat and the valve element are communicated through the first balance hole formed in the valve seat. The air pressure difference in the cavities at the upper and lower ends of the valve seat in the opening or closing process of the electric valve is reduced, and the difficulty in moving the iron core due to overlarge air pressure difference is avoided, so that the stability of the electric valve is improved.

The utility model relates to the field of ball valves, and particularly discloses a valve seat sealing structure for a ball valve. The valve seat sealing structure for the ball valve comprises a valve body, a ball body installed in the valve body, a valve rod installed at the upper end of the valve body, valve seats installed on the two sides of the ball body and a valve deck fixedly installed at one end of the valve body, a positioning groove used for allowing one valve seat to be inserted is formed in the inner wall of one end of the ball body, and the outer sides of the two valve seats are each provided with two installation grooves. The inner wall of each installation groove is connected with a sealing ring, a sealing groove is formed in the side, close to the ball body, of each valve seat, a sealing gasket connected with the ball body is installed on the inner wall of each sealing groove, a limiting groove used for allowing the other valve seat to be inserted in is formed in the inner wall of one side of the valve deck, and one end of the valve body is fixedly connected with a plurality of fasteners used for fixing the valve deck. The damage risk caused by too high pressure or uneven stress of the sealing piece can be effectively reduced, so that the sealing performance and reliability of the ball valve are improved, and the service life of the sealing piece is prolonged.

The present invention relates to the field of etching processing equipment, and specifically to an etching liquid cooling device for an etching machine, which includes a shell, the shell includes a first square frame and a second square frame with an open structure at one end, the open end of the first square frame is sleeved in the second square frame, and is slidably matched and sealed with the second square frame, and a heat exchange plate for cooling the etching liquid is arranged in the shell. The present invention can reduce the pressure difference inside and outside the heat exchange channel by compressing the shell, improve the problem of sealing failure between the heat exchange plates, enhance the resistance of the heat exchange channel to instantaneous impact, and meet the use requirements of different working conditions; by arranging a plurality of closed independent chambers in the shell, the fine control of the pressure in each independent chamber is realized to adapt to the actual working condition where the pressure in the heat exchange channel gradually decreases from the liquid inlet to the liquid outlet, and further ensures the sealing reliability of the heat exchange channel; the setting of the vacuum chamber enables the shell to have a heat preservation function, reducing the cold energy consumption of the coolant.

The invention discloses a differential mold locking pressure relief oil circuit for a two-plate injection molding machine, which comprises a cartridge valve, two two-position two-way electromagnetic reversing valves and an oil tank; the bottom working oil port of the cartridge valve is connected with the mold locking cavity, and the side working oil port is connected with the mold breaking cavity to form a main channel oil circuit; during the mold locking pressure relief action, when the electromagnet of the second two-position two-way electromagnetic reversing valve is energized, the pilot port of the cartridge valve reaches the side working oil port of the cartridge valve through the first damping, the third damping, the fourth damping and the fifth damping, and the bottom working oil port of the cartridge valve reaches the side working oil port of the cartridge valve through the second damping, the fourth damping and the fifth damping, so that the cartridge valve is slowly opened to realize differential mold locking pressure relief; during the mold breaking action, when the electromagnet of the first two-position two-way electromagnetic reversing valve is energized, the pilot port of the cartridge valve reaches the oil tank through the first damping, so that the cartridge valve is quickly opened to realize differential mold breaking; the advantages are that the mold locking pressure relief process is stable, the mold breaking action is taken into consideration, and the oil cleanliness is good.

A gas processing system includes a vessel (102) defining a cavity (106) for processing a gas. The vessel includes a process gas inlet (108) for receiving a process gas at an input pressure and a process gas outlet (110) for discharging the process gas at an output pressure. The gas processing system also includes a shaft (122) coupled to the vessel and a stepwise sealing system (114) including a plurality of seals (136) spaced along the shaft. The shaft is configured to transfer mechanical energy to or from the gas in the vessel. Each adjacent pair of seals defines a corresponding pressure space therebetween. One of the pressure spaces is an equalization pressure space (144a) in hydraulic communication with the process gas inlet via a flow line (116) such that, in operation, a pressure in the equalization pressure space is maintained at an equalization pressure relative to a pressure in the process gas inlet.

The present disclosure relates to a screw compressor and a refrigeration system, wherein the screw compressor comprises a body (1) comprising a first slot body (11) extending along a preset direction (x), a slide valve limiting component (2) comprising a supporting piece (21) connected to the body (1) and a limiting piece (22) extending along the preset direction (x) and comprising a first part (221) and a second part (222), the first part (221) extending out of the supporting piece (21) and being located in the first slot body (11), and the second part (222) being arranged on the supporting piece (21), and a slide valve (3) movably connected to the limiting piece (22) along the preset direction (x).

The present invention discloses a control method for a pure mechanical pneumatic control logic actuator of a vacuum toilet, comprising the following steps: 1) 0-position state control, 2) system start-up of a flush, 3) sewage tank pumping, 4) secondary flushing, 5) sewage tank discharge, and 6) resetting. The control method of the present invention has simple steps, and can not only adjust the speed of opening or closing of the first pneumatic stop valve and the second pneumatic stop valve, and reduce the noise of the toilet during the suction and sewage discharge process, but also play the role of airflow flushing the inner wall of the flow channel, preventing the risk of dirt adhesion and jamming, and improving the sewage discharge efficiency, and at the same time can ensure that the sewage and air in the sewage tank will not flow back through the first pneumatic stop valve.

An electro-hydraulic actuator for a brake system, comprising: a housing (1) defining an inner space (10), the housing having a first opening (11) and a second opening (12); a master brake cylinder (2) positioned in the first opening, said master brake cylinder being attached at the housing so as to seal the first opening in a fluid-tight manner; an electric motor (4) arranged at the housing; the invention relates to a brake device (1) comprising a housing (2), a master brake cylinder (3) accommodated in the interior of the housing, and a transmission (3) which is movably coupled to the master brake cylinder, the transmission having a transmission intermediate part which can be moved along a longitudinal axis (L1) and which divides the housing relative to the longitudinal axis into a first housing region (13) and a second housing region (14), a master brake cylinder is arranged in the first housing region, and the second housing region faces the second opening. The actuator further comprises an equalization diaphragm which closes the second opening in a fluid-tight manner, said equalization diaphragm being elastically deformable in order to reduce a pressure difference between the first housing region and the second housing region upon axial displacement of the transmission intermediate part.

The utility model discloses a clip valve protection device, which belongs to the field of clip valves and comprises a mounting pipeline, the mounting pipeline is mounted at the rear end of an electric pipe clip valve, a protection component is mounted in the mounting pipeline and consists of a protection plate and an arc-shaped outer baffle, the arc-shaped outer baffle is fixedly mounted on the outer wall of the protection plate, a circulation hole is formed in the protection plate, and the arc-shaped outer baffle is fixedly mounted in the circulation hole. According to the electric pipe clamp valve protection device, the protection device composed of the installation pipeline and the protection assembly is arranged, meanwhile, the installation pipeline is installed on the rear side of the electric pipe clamp valve, and therefore the pressure difference between the two ends of the electric pipe clamp valve can be reduced; therefore, erosion of mortar to a rubber pipe in the electric pipe clamp valve can be reduced, the service life of the rubber pipe in the electric pipe clamp valve can be prolonged, and economic loss caused by replacement of the rubber pipe of the electric pipe clamp valve and influence on continuity of a filling process are reduced.

The electronic expansion valve comprises a valve body, a guide seat, a valve element assembly and a rotation stopping piece, the valve body is provided with an inner cavity with a valve port, the valve element assembly is arranged in the inner cavity in a reciprocating motion mode so as to open or close the valve port, the guide seat is fixed in the inner cavity of the valve body and divides the inner cavity into a first sub-cavity and a second sub-cavity, and the rotation stopping piece is arranged in the first sub-cavity and the second sub-cavity. And the through hole of the guide seat is communicated with the first sub-cavity and the second sub-cavity. The rotation stopping piece is fixed to the valve element assembly and located in the through hole, the rotation stopping piece is matched with the through hole to limit rotation of at least the part, matched with the valve port, of the valve element assembly, and a first gap between the rotation stopping piece and the through hole communicates with the first sub-cavity and the second sub-cavity. According to the electronic expansion valve, the closed space is opened or closed through sliding of the valve element in the inner cavity. Due to the fact that the closed space has certain pressure, the phenomenon of uneven pressure may occur in an inner cavity of the valve body. The first gap can balance the pressure in the inner cavity, and reliable work of the electronic expansion valve is guaranteed.

The application discloses a high-temperature co-electrolysis cell stack module structure and relates to the technical field of fuel cells, which comprises an electric pile group and a pipeline assembly; the electric pile group comprises six electric piles which are arranged in a regular hexagon around a central position and are left empty in the central position; the electric pile comprises a top plate and a bottom plate, and the top plate and the bottom plate are in a regular hexagon structure; the electric pile further comprises four groups of stretching assemblies, the stretching assembly comprises a pull rod and a spring, and the spring is in a stretching state; the pipeline assembly comprises an air inlet pipeline and an air outlet pipeline; the gas entering a total gas inlet is shunted to the first gas inlets of the six electric piles, and the gas entering a total air inlet is shunted to the first air inlets of the six electric piles; the air outlet pipeline comprises a total gas outlet and a total air outlet, and the gas flowing out of the first gas outlets and the first air outlets of the six electric piles is respectively converged to the total gas outlet and the total air outlet. The application adopts a honeycomb six-pile ring arrangement structure, and the compactness and the modularization level of the system are significantly improved.

The invention provides a screw vacuum pump, and belongs to the technical field of pump bodies. The screw vacuum pump solves the problem that in an existing screw vacuum pump, the length of a screw needs to be increased in order to achieve high air exhaust efficiency. The screw vacuum pump comprises a pump body, two rotors are arranged in the pump body, and the screw vacuum pump is characterized in that each rotor is provided with K spiral turns, the total length of each rotor is L, the screw pitches of the rotors from the air inlet end to the air outlet end are P1-Pi in sequence, the two rotors are respectively a left-handed rotor and a right-handed rotor, and the two rotors are meshed with each other, wherein the rotating angle of one rotor end face molded line around the rotating center is a central angle theta, the rotor has a spiral line coordinate equation, and the peripheral surface of the rotor is formed by rotating each section of curve on the end face molded line along a spiral line. According to the screw vacuum pump, the screw pitch of the rotor is adjusted according to specific requirements, the optimal screw pitch is achieved, and therefore the length of the rotor can be reduced while high air exhaust efficiency can be guaranteed.

The utility model relates to the technical field of household appliances, and discloses a fresh air conditioner. Comprising an air supply box (100), one side of which is provided with a fresh air inlet (110) communicated with the outdoor environment, and the other side of which is provided with a fresh air outlet communicated with the indoor environment; the air outlet box (200) is arranged on one side of the air supply box (100), one side of the air outlet box (200) is provided with an exhaust air inlet (210) communicated with the indoor side environment, and the other side of the air outlet box (200) is provided with an exhaust air outlet (220); the air pipe assembly (300) is provided with a first communication port (310), a second communication port (320), a third communication port (330) and a fourth communication port (340). According to the method and the device, indoor temperature fluctuation is reduced, and diversified ventilation requirements of users are met.

The valve with the differential pressure compensation structure comprises a valve body, a first handle is installed on the valve body, two connecting pipes are symmetrically and fixedly communicated with the valve body, and the differential pressure compensation mechanism is installed on the valve body; the differential pressure compensation mechanism comprises a liquid inlet pipe and a liquid outlet pipe which are fixedly communicated with the two connecting pipes respectively, mounting holes are formed in the two connecting pipes, and the liquid inlet pipe and the liquid outlet pipe are fixedly connected into the two mounting holes respectively. Oil on one side of the valve body can be supplied to the other side of the valve body in advance, so that the pressure difference between the two sides of the valve body can be reduced, the pressure on the two sides of the valve body is gradually equal, the resistance when the valve body is opened can be reduced, and the valve opening convenience is effectively improved; and the problem that a hydraulic system is greatly impacted due to the fact that the pressure difference between the two sides of the valve is too large can be solved, and the practical safety of the hydraulic system is effectively improved.

The utility model relates to the field of valves, and particularly discloses a pilot-operated gate valve which comprises a main valve, a valve rod is rotatably connected in the main valve, a valve plate is slidably connected in the main valve, and a pilot-operated valve is connected below the main valve. The pilot valve comprises a valve body, the upper end of the valve body is fixedly connected with connecting pipes, the connecting pipes are communicated with the interior of the main valve, and the connecting pipes are located on the two sides of the valve plate. By designing the pilot valve, fluid on one side of the valve body can be conveyed to the other side of the valve body when the internal pressure of the valve body reaches customization, the pressure difference of the two sides is reduced, the friction force generated when the valve plate ascends is reduced, and the valve plate can be conveniently opened. By designing the plate spring and the sealing blocks, when the spring needs to be detached and replaced, the valve plate continues to move downwards, so that the plate spring can be driven to deform to push the sealing blocks on the two sides to seal the connecting pipe, the valve body can be opened to replace the spring, and the service life of the pilot valve is prolonged.

This utility model discloses a precision-drilled multilayer circuit board, belonging to the field of multilayer circuit boards. It includes a circuit board and rivets. Each rivet comprises a linkage structure, a clearance groove, a limiting ring, a riveting groove, an outer protective ring, an assembly ring, a riveting plate, a riveting connecting rod, an inner pressure ring, a snap-fit ​​groove, and a through groove. Through the combination of the outer protective ring and the limiting ring, and the inner riveting groove and the riveting plate, stacked rivets can be achieved. Each rivet can independently press the circuit board through the limiting ring, ensuring the stability between circuit board layers and improving interlayer positioning accuracy. Simultaneously, it reduces the pressure difference between layers, thereby reducing deformation caused by uneven interlayer stress, ensuring the accuracy of subsequent drilling, etc. It is not limited by the number or thickness of layers, allows for convenient assembly, and eliminates the need for multiple sets of riveting holes, saving circuit board space. During riveting, a single riveting connecting rod can drive all assembled rivets to be riveted simultaneously, eliminating the need for multiple riveting operations, ensuring stability while improving production efficiency.

The utility model discloses an aquaculture pond water inlet and outlet pipe which comprises a PVC water inlet and outlet main pipe, the outer wall of the PVC water inlet and outlet main pipe is respectively connected with a first pipeline accessory and a second pipeline accessory, and the first pipeline accessory and the second pipeline accessory are symmetrically arranged. Filtering mechanisms are mounted at the upper parts of the interiors of the first pipeline accessory and the second pipeline accessory; according to the water inlet and outlet pipe of the aquaculture pond, when an aquaculture water pump is closed, outside air can rapidly enter the PVC water inlet and outlet main pipe through the pipeline accessory, the pressure difference between the inside and outside of the PVC water inlet and outlet main pipe is reduced, the PVC water inlet and outlet main pipe is prevented from being broken and damaged due to pressure, and therefore aquaculture loss is reduced; the first filter screen and the second filter screen can block large and small impurities in outside air, and the situation that pipeline accessories and the PVC water inlet and outlet main pipe are blocked by the impurities in the air for a long time is avoided.

The present invention introduces a pre-inflating device for a shunt pipe of a low-pressure carbon dioxide fire extinguishing system and a method of use, including a pre-inflating valve, a base joint, a connecting pipeline, a pre-inflating valve inspection valve and a valve position monitoring device; one end of the pre-inflating valve is arranged on the shunt pipe of the low-pressure carbon dioxide fire extinguishing system through a base joint; the other end is connected to the pre-inflating valve inspection valve through a connecting pipeline; the other end of the pre-inflating valve inspection valve is connected to the gas source pipe of the fire extinguishing agent storage device through a connecting pipeline; the valve position monitoring device is respectively arranged on the pre-inflating valve and the pre-inflating valve inspection valve. The pre-inflating device for a shunt pipe of a low-pressure carbon dioxide fire extinguishing system and a method of use of the present patent can truly and effectively reflect the performance of each partition selection valve under actual working conditions; the pressure difference between the inlet and outlet of the main inspection valve is small, and the external force required to open the valve is small, which is also conducive to improving the life and performance of the main inspection valve.

The manual valve convenient to open and close comprises a valve body, an operating component, a valve element, a bypass pipe and a bypass valve, and a high-pressure cavity, a valve cavity and a low-pressure cavity which are sequentially communicated are formed in the valve body; by means of the manual action of a user on the operating component, the valve element is installed in the valve cavity between the closing position and the opening position in a switchable mode, the by-pass pipe is installed between the high-pressure cavity and the low-pressure cavity, the by-pass valve is installed on the by-pass pipe, and the high-pressure cavity and the low-pressure cavity can be communicated in a two-way mode by means of opening of the by-pass valve. The embodiment of the invention has the beneficial effects that the bypass pipe and the bypass valve are erected between the high-pressure cavity and the low-pressure cavity to eliminate or at least reduce the pressure difference and avoid or at least reduce the resistance of the pressure difference to the opening and closing of the manual valve, so that the manual opening and closing can be easily realized.

The invention discloses a hydrogen-oxygen pressure balance control method and system, and relates to the field of general control systems. The control method comprises the following steps: obtaining an oxygen side pressure and a hydrogen side pressure, and setting a first preset pressure; adjusting the oxygen side pressure so that =, and adjusting the hydrogen side pressure so that = at the same time; when ==, setting a second preset pressure; adjusting the oxygen side pressure so that =, and adjusting the hydrogen side pressure so that = at the same time; when ==, repeating the above steps, sequentially setting a plurality of preset pressures and adjusting the oxygen side pressure and the hydrogen side pressure until == output pressure; the hydrogen-oxygen pressure balance control method provided by the invention adopts a stepwise comparative rising control method for pressure boosting, and the control method can realize equal pressure rising and equal pressure output of the hydrogen and oxygen sides under different production periods.

The utility model discloses a solid-liquid separation device for medical wastewater, which comprises a filter assembly, a constant temperature assembly and an air pump assembly, and is characterized in that the filter assembly comprises a rotary barrel, a sealing cover arranged above a rotary base and a liquid discharge pipe arranged below the sealing cover; the output end of the motor is fixedly connected with the center of the bottom of the rotating barrel; an air inlet is formed in the sealing cover, a filter screen cylinder is arranged on the sealing cover, the filter screen cylinder is located under the liquid discharging pipe, and the filter screen cylinder is fixedly connected with the sealing cover; the liquid discharging pipe is fixedly connected with the sealing cover in a sleeving mode, a collecting device is arranged on the liquid discharging pipe, and the liquid discharging pipe is fixedly connected with the collecting device in a sleeving mode; a temperature sensor is arranged in the rotary barrel and is fixedly connected with the inner wall of the rotary barrel; compared with a traditional device, the solid-liquid separation device has the advantages that centrifugal separation is adopted, air pressure promotes sewage flow, and pressure difference promotes liquid to flow through the filter screen cylinder, so that the solid-liquid separation efficiency is improved.

The invention discloses a pneumatic structure for suppressing vortex vibration of a cantilever box girder bridge, relates to the technical field of bridge engineering, and solves the problem that an effective pneumatic structure which can effectively control the vortex vibration amplitude of a bridge is lacked in the prior art. The box girder comprises a box girder body and cantilevers arranged on the two sides of the box girder body respectively, skirt plates are symmetrically arranged on the lower portions of the ends of the two cantilevers respectively, and the skirt plates are arranged on the sides, away from the box girder body, of the cantilevers; the apron board and the cantilever form an inclined angle and incline towards the box girder main body on the corresponding side; rectification plates are symmetrically arranged at the turning positions of the two sides of the lower portion of the box girder body respectively, the rectification plates are in a bevel shape, the two rectification plates are obliquely arranged, and the inclination directions of the turning positions of the lower sides of the rectification plates are consistent with the inclination directions of the apron boards on the corresponding sides respectively; the invention aims to fundamentally suppress or weaken the formation of vortexes at the windward side end part and the beam bottom of a cantilever and a box beam main body, reduce the pressure difference between the upper surface and the lower surface of a cross section and eliminate the vortex-induced vibration of a main beam.