29results about How to "Increase the differential pressure" patented technology

The invention relates to an adjustable computer heat dissipation device and a heat dissipation method.The adjustable computer heat dissipation device comprises a computer mainframe box, a heat dissipation module, an adjusting module and a controller, the heat dissipation module is fixedly connected with an installation assembly, the heat dissipation module comprises fan blades and cooling fins, the fan blades are electrically connected with a driving part, and the driving part is connected with the installation assembly; the adjusting module comprises a replacement plate, a heat dissipation cavity is formed in the replacement plate, a plurality of air flow pipelines are installed in the heat dissipation cavity, the outer side walls of the air flow pipelines are sleeved with deformable rings, energy storage cavities are formed between the air flow pipelines and the deformable rings, and through holes are formed in one ends of the air flow pipelines; the controller is in signal connection with a monitoring assembly, and the controller adjusts the power of the driving part according to real-time temperature data monitored by the monitoring assembly. Compared with the prior art, the detachable and adjustable design enables the heat dissipation equipment to easily adapt to computer mainframe boxes of different models and specifications, and the heat dissipation performance can be automatically adjusted according to temperature and wind speed data monitored in real time.

The upper layer of the hydraulic valve is a driving module, and the lower layer of the hydraulic valve is a valve body module; the valve body module comprises a plurality of valve body units and a swing rod, the valve body units are arranged on the same side of the swing rod or symmetrically arranged on the two sides of the swing rod, a valve element of each valve body unit is provided with an ejector rod, and the ejector rods make contact with the lower end of the swing rod. The driving module comprises a driving unit and a transmission unit, and the driving unit is connected with the upper end of the swing rod through the transmission unit and drives the swing rod to generate displacement in the horizontal direction. When the motor / electromagnet drives the swing rod to swing, the ejector rod is driven to move, the ejector rod moves to push the valve element to move so as to open and close the valve element, and different functions of the valve are achieved through different combinations. The cavities are stacked in an overlapped mode, so that the overall size of the valve is effectively reduced.

The invention relates to the technical field of industrial dust removal and environmental protection, in particular to a novel gas-solid ejector capable of preventing dust accumulation, which mainly comprises a nozzle, a receiving chamber, a mixing pipe and a diffuser pipe. On one hand, the speed of working fluid sprayed out of the nozzle can be remarkably increased, the pressure difference in a receiving chamber is increased, an ejection working medium falling from a feeding port obtains higher driving force, and it is ensured that the substances can completely flow into a mixing chamber along with the working fluid as much as possible; on the other hand, due to the special inclination angle design of the reducing pipeline, the materials falling on the pipeline naturally flow to the mixing chamber under the traction of gravity, accumulation of the materials in the mixing chamber is effectively avoided, in addition, the area where the lower wall of the inner cavity of the receiving chamber is connected with the reducing pipeline and the lower edge of the nozzle is designed to be of a solid structure, and the structure is simple. And dust particles are ingeniously prevented from being deposited in the region.

A heat sink assembly includes: a heat sink having a plurality of ribs integrally molded along an internal length direction by extrusion molding, a space between the plurality of ribs forming a flow path, and having a first surface and a second surface open at both ends in the length direction; and a pair of end plugs respectively closing a first surface and a second surface at both ends of the heat sink, in which the heat sink ribs include: a middle rib closed at one end of the first surface and open at the other end of the second surface relative to the pair of end plugs; and a side rib provided on at least one side with respect to the middle rib and opened at both ends of the first surface side and the second surface side.

The invention discloses an atmosphere sintering furnace and a degreasing sintering method, and relates to the technical field of sintering equipment. The atmosphere sintering furnace comprises a furnace body, a negative pressure device, a blower device and an oxygen circulation system; a first air outlet of the furnace body is connected and communicated with an air inlet of the negative pressure device, and a first air inlet of the furnace body is connected and communicated with an air outlet of the blower device; the oxygen circulating system comprises an oxygen cooling device, an oxygen purifying device, a pressurizing device and a pure oxygen storage tank which are connected and communicated in sequence; a second gas outlet of the furnace body is connected and communicated with a gas inlet of the oxygen cooling device, and the second gas outlet of the furnace body is connected and communicated with a gas outlet of the pure oxygen storage tank; electric control valves are arranged in all the air outlets and all the air inlets, and all the electric control valves are connected with the control system in an electric control mode. During degreasing, the inside of the furnace is pumped to set negative pressure, exhaust of waste gas generated by a binder in a blank is accelerated through cooperation with the blower device, oxygen circulation is achieved during sintering, and oxygen waste is avoided.

The invention provides a water-free detection device and a water-free detection method, and relates to the technical field of detection equipment. Comprising an air inlet pipeline connected with an air source, and a first test pipeline communicated with the air inlet pipeline; wherein the first test pipeline is provided with a speedup tube, the upstream end of the speedup tube is also provided with a first air pressure sensor, and the downstream end of the speedup tube is provided with a second air pressure sensor which is used for detecting air pressure values of the front end and the rear end of the speedup tube respectively; the speedup tube is suitable for amplifying a differential pressure value of a test product at the downstream end of the speedup tube caused by small change of exhaust flow so as to accurately measure an air pressure difference value at the upstream end and the downstream end of the speedup tube. According to the scheme, the accuracy of water-free detection is improved.

The invention discloses a combined type quick exhaust valve with an overpressure protection function, and relates to the technical field of exhaust valves, the quick exhaust valve comprises a valve body, an opening and closing device, an adjusting device and a valve cover, the valve body is provided with an adjusting cavity, the upper side of the adjusting cavity is provided with an opening, the valve cover is located at the opening of the adjusting cavity, and the valve cover and the valve body are fixedly connected; the opening and closing device is connected with the valve body and the valve deck, and the adjusting device is connected with the opening and closing device and used for adjusting the overflowing sectional area of outlet air. The opening and closing device is used for controlling air intake and air exhaust, is opened when the internal air pressure is increased and is used for exhausting air, is opened when the internal air pressure is low and is used for air intake, a composite design is adopted, the fluid conveying stability is improved, the adjusting device is arranged to adjust the overflowing sectional area during air exhaust, and when the internal instantaneous pressure is increased, the overflowing sectional area of air exhaust is increased; overpressure protection is carried out, and the situation that the overall operation safety of the valve is affected by overlarge air pressure is prevented.

A negative pressure self-priming backwashing device comprises a filter body shell, a primary filter chamber, a secondary filter chamber, a backwashing device and a controller. The primary filter chamber and the secondary filter chamber are both arranged inside the filter body shell, and a perforated partition is arranged between the two. The backwashing device comprises a backwashing sewage suction device and a closed vacuum device. The closed vacuum device comprises a backwashing drive chamber, a backwashing sewage suction pipe, a sewage sealing box, a submersible pump and a sewage discharge pipe. The backwashing drive chamber is arranged inside the filter body shell and is separated from the secondary filter chamber by a partition. The backwashing drive chamber and the sewage sealing box are connected by a backwashing sewage suction pipe. The submersible pump is arranged inside the sewage sealing box, and the backwashing sewage suction device is arranged inside the filter body shell; the submersible pump, the water inlet pressure sensor and the water outlet pressure sensor are all connected to the controller. The present invention adopts a submersible pump to pump and discharge so that negative pressure is generated in the filter body, thereby realizing the backwashing function of the filter of the low-pressure drip irrigation system.

The application provides an oxygen-enriched combustion heating system and a pipe diameter design method thereof, and relates to the technical field of heating furnace combustion. The system comprises a heating furnace, a mixing pipeline and an ignition head. The input end of the mixing pipeline is connected with the oxygen-enriched air, the output end of the mixing pipeline is communicated with the input end of the ignition head, the output end of the ignition head penetrates through the furnace wall of the heating furnace and is communicated with the inside of the heating furnace, the mixing pipeline comprises a straight pipe part and a variable diameter part, the variable diameter part is located between the two straight pipe parts and is communicated with the two straight pipe parts, the variable diameter part comprises a variable small part, a thin pipe part and a variable large part in sequence along the gas flow direction, the variable small part gradually decreases in diameter along the gas flow direction, the thin pipe part and the variable small part have the same diameter at the smallest end, one end of the thin pipe part away from the variable small part is communicated with the variable large part, the variable large part gradually increases in diameter, the middle part of the thin pipe part is communicated with a gas supply pipeline, and the combustible gas is filled in the gas supply pipeline. The system can uniformly mix the oxygen-enriched air and the combustible gas, so that the combustion efficiency and quality can be improved.

The present application relates to the technical field of metal casting, and particularly discloses a core making machine, which is provided with at least two regulating systems in the circumferential direction of the side wall of a core box. During sand shooting, the exhaust adjusting branch of the regulating system controls the exhaust amount during sand shooting to avoid excessive pressure drop loss, and the negative pressure adjusting branch adjusts the vacuum degree in the cavity to increase the pressure difference between the region and other regions, improve the flowability of the sand, and facilitate compacting of the sand, thereby achieving good core making effect. During solidification and blowing, the blowing mechanism can blow triethylamine gas into the cavity through the top and side of the core box, achieve the best solidification and air intake combination, increase the air intake area, shorten the solidification time, improve the solidification efficiency, and increase the opening of the exhaust adjusting branch to increase the exhaust amount of the corresponding region and ensure smooth air intake. The present application also provides a sand shooting and solidification process control method applied to the core making machine.

The application provides a sewage treatment equipment with intelligent dosing and chlorination, and relates to the technical field of sewage treatment.The sewage treatment equipment with intelligent dosing and chlorination is installed on a main pipeline through a metering pump, an electromagnetic flowmeter is installed on the upstream of the main pipeline, and an exhaust part and a full-flow part are sequentially connected in the water flow direction on the upstream of the main pipeline;the upstream of the exhaust part is connected to the main pipeline, the exhaust part is connected to the full-flow part, and the downstream of the full-flow part is connected to the electromagnetic flowmeter;the exhaust part is designed as a transverse Venturi tube, multiple gas collection cabins are uniformly arranged on the throat of the exhaust part, the inner diameter of the gas collection cabin is larger than that of the throat, the bubbles in the fluid are extracted and gathered through the low pressure formed by the position of the throat, and an exhaust valve is connected to the top end of the gas collection cabin;the full-flow part is arranged as a U-shaped tube with low upstream and high downstream, the U-shaped opening formed by the full-flow part is upward, a liquid seal is formed in the full-flow part to realize stable liquid level, buffer pressure fluctuation, and ensure that the downstream fluid forms a full-pipe state.

The utility model relates to the technical field of volute molds, in particular to a volute double-runner partition plate forming mold which comprises a mold body and a pouring cup, the pouring cup comprises a direct pouring part and a bearing part fixedly connected to the top of the direct pouring part, and under the condition that the mold body and the pouring cup are assembled, the bearing part is fixedly connected to the top of the direct pouring part. The bottom of the straight pouring part of the pouring cup is inserted into the cross gate of the mold body, the distance between the bottom surface of the cross gate of the mold body and the top surface of the bearing part of the pouring cup is not less than 185 mm, and the distance between the top of the pouring cup and the bottom surface of the cross gate of the mold body is greater than the distance between the riser of the mold body and the bottom surface of the cross gate of the mold body. According to the embodiment of the invention, the internal pressure difference of the cavity is increased in the pouring process by increasing the total pressure head of the mold, so that the mold filling speed and the pressure difference of the mold during pouring are increased, the dead head can be ensured to be filled, the probability of missing, shrinkage porosity and air holes of the volute double-flow-channel partition plate is reduced, and the yield of castings is remarkably increased.

The invention discloses a self-adaptive liquid pipeline silencing system and method based on jet flow rectification silencing, and the system comprises a silencer housing, at least one jet flow disc disposed in the silencer housing, a flow meter disposed in a pipeline behind a pump, and a silencer controller which is in communication connection with the pump and the flow meter. The pressurizing and liquid returning assembly is arranged on the outlet side of the silencer shell, communicated with the jet flow disc and used for pressurizing and returning liquid at the outlet of the silencer and spraying the liquid out of the jet flow disc; the liquid part at the outlet of the silencer is repeatedly sucked out through the pressurization liquid return assembly and sprayed out through the jet flow nozzles after being pressurized, so that large vortexes generated at the upstream of the pump are scattered and broken into small vortexes, the small vortexes are finally rectified into laminar flow through the multiple stages of jet flow discs, and liquid pressure pulsation is reduced. The silencer controller is used for collecting rotating speed signals and flow signals of the pump and controlling the jet speed and flow of the jet disc, self-adaptive adjustment of the silencing effect of the liquid pipeline is achieved, and the silencing effect is guaranteed.

The present invention relates to an intermediate case of a humidifier for a fuel cell and a humidifier for a fuel cell, comprising: an intermediate body accommodating at least one cylinder including a plurality of hollow fiber membranes; a partition plate portion provided inside the intermediate main body, the partition plate portion dividing the inside of the intermediate main body into an inflow space into which a first gas flows and an outflow space from which the first gas is discharged; and a bypass hole formed through the partition plate portion, the bypass hole enabling a portion of the first gas introduced into the inflow space to bypass the cylinder and flow into the outflow space.

The utility model discloses a novel fuel cell test fixture, which relates to the technical field of cell test fixtures and specifically comprises an anode collector plate and a cathode collector plate, gas pipeline connectors are respectively arranged on two sides of the anode collector plate and the cathode collector plate, and one gas pipeline connector is an inlet; the anode flow field plate and the cathode flow field plate are located between the anode collector plate and the cathode collector plate, the anode flow field plate is located on the side face of the anode collector plate, the cathode flow field plate is located on the side face of the cathode collector plate, and the surface of the anode flow field plate and the surface of the cathode flow field plate are each provided with two first air ports. In the application process, the heating sheets are arranged among the end plates, the insulating plates and the collector plates and are tightly attached to the cathode and anode collector plates, so that rapid temperature rise is achieved; meanwhile, the phenomena of air shortage and water logging of the membrane electrode are effectively reduced.

The utility model provides a solar energy, hydrogen energy and wind energy complementary power supply system, which comprises a solar panel group and a wind turbine, the wind turbine is communicated with a pneumatic generator through an air compressor, and the pneumatic generator is connected with a constant-voltage shunt circuit through a rectifier and respectively supplies power to electrolysis equipment and an energy storage battery. The solar panel group is connected with the constant-voltage shunt circuit and supplies power to the water electrolysis equipment and the energy storage battery respectively, an oxygen outlet of the water electrolysis equipment outputs oxygen, and the energy storage battery stores redundant electric energy; a hydrogen outlet of the water electrolysis equipment is connected with the hydrogen compression tank through the dehumidifier, the air compressor is connected with the pneumatic generator through the air compression tank, and the air compression tank and the hydrogen compression tank are communicated with the fuel cell through the electromagnetic valve so as to provide solid hydrogen and oxygen for the fuel cell. According to the device, solar energy, hydrogen energy and wind energy can be complemented, oxygen supply of the fish pond is guaranteed, and meanwhile enough domestic electricity is provided.

The invention provides a rotor type compressor, an air conditioning system and a control method. The rotor type compressor comprises an upper cylinder cover, a lower cylinder cover and an air cylinder between the upper cylinder cover and the lower cylinder cover, and a rotor is arranged in the air cylinder; the upper cylinder cover or / and the lower cylinder cover is / are provided with a pressure relief channel communicated with a compression cavity of the air cylinder, the first end of the pipeline is connected with the pressure relief channel, the second end of the pipeline is communicated with an air suction cavity of the air cylinder or a device communicated with the air suction cavity, and a first valve is arranged between the two ends of the pipeline. The first valve is used for closing or opening the pipeline. The rotor type compressor is provided with the pipeline for connecting the compression cavity and the air suction cavity of the compressor or the device communicated with the air suction cavity, when the rotor type compressor stops running, the valve for controlling the pipeline is opened, the pressure difference between the high-pressure side and the low-pressure side of the compressor is balanced, and the pressure difference is reduced. And the time required for restarting the rotor type compressor after shutdown is shortened.

The invention relates to the field of high-voltage switch cabinets, in particular to a high-voltage switch cabinet with a fault detection function, which comprises a cabinet body, a fault detection device is mounted in the cabinet body, a shielding frame is fixedly mounted on the top side of the cabinet body along the edge, a plurality of mounting cylinders are fixedly mounted on the top side of the cabinet body, and the mounting cylinders are communicated with the interior of the cabinet body. A nylon sleeve is arranged in the mounting cylinder in a threaded penetrating mode, a shielding plate is arranged at the top end of the nylon sleeve, a plurality of limiting plates are installed on the bottom face of the shielding plate, the multiple limiting plates are arranged around the center shaft of the mounting cylinder at intervals, the limiting plates are fixedly connected with the inner wall of the nylon sleeve, and first limiting blocks are fixedly installed on the bottom sides of the limiting plates. The first limiting block is located in the cabinet body and used for abutting against the inner top wall of the cabinet body. The high-voltage switch cabinet has the effect of improving the safety of the high-voltage switch cabinet during pressure relief.

The invention relates to a flow restrictor (201) for a mass flow regulator, which is designed to regulate a fluid mass flow, having at least two flow guide elements (214, 215, 216), the flow guiding elements are from the following group: an inlet plate (214) with at least one inlet hole (217), a throttle plate (215) with at least one throttle hole (218), a discharge plate (216) with at least one discharge hole (219), the flow guiding elements (214, 215, 216) are arranged at a distance from one another, and the flow guiding elements (214, 215, 216) are arranged at a distance from one another. The at least one inlet opening (217), the at least one throttle opening (218) and the at least one outlet opening (219) are arranged offset relative to one another in a spatial direction transverse to a central axis (202) of the flow throttle (201).

According to the Bluetooth inflation gun system for the automobile, a Bluetooth inflation gun is in radio connection with a tire pressure display screen, a user does not need to check tire pressure information through wired electric connection or an additional interface any more, and therefore using convenience is greatly improved. According to the scheme, the four operation keys on the operation panel correspond to the four tires of the vehicle respectively, a user can send tire pressure information of the specific tires to the tire pressure display screen through simple key operation, and the tire pressure display screen is provided with four display devices, so that the user can know the overall tire pressure condition of the vehicle clearly at a glance; data of four tires do not need to be recorded respectively, operation is simpler, and user experience can be improved; and each tire is provided with a corresponding operation key, so that the user is not easy to confuse or operate mistakenly. Besides, the tire pressure display screen adopts a modular design, and the bottom shell, the mounting frame, the front cover and the four display devices are respectively mounted on different connecting circuit boards, so that each component can be independently mounted and replaced, and the maintenance is convenient.

This application provides a wafer adsorption carrier, comprising: a first carrier body, the first carrier body including a sealing portion disposed circumferentially and a plurality of independently disposed grooves, the sealing portion being located radially outside the plurality of grooves, the plurality of grooves being uniformly distributed circumferentially on the first carrier body; wherein each groove includes a radially extending first groove and a circumferentially extending second groove, the first groove and the second groove being interconnected; and a second carrier body, the second carrier body being disposed below the first carrier body, the second carrier body including a first air channel, the plurality of grooves of the first carrier body having first suction holes at their radial ends, the plurality of first suction holes being respectively connected to the first air channel. The wafer adsorption carrier of this application can stably adsorb wafers.

The utility model relates to the technical field of low-voltage electric appliances, in particular to an arc extinguishing chamber, an arc extinguishing system and a circuit breaker. The arc extinguish chamber comprises two oppositely arranged arc extinguish chamber side walls and a grid plate group arranged between the two arc extinguish chamber side walls, an arc extinguish cavity is defined by the two arc extinguish chamber side walls and the grid plate group, the arc extinguish cavity comprises at least two arc extinguish channels sequentially distributed in the first direction, and each arc extinguish channel extends from the grid plate group to a cavity opening of the arc extinguish cavity; the cavity opening end of the arc extinguishing cavity is provided with a first contraction area, and the opening area of the first contraction area is in a decreasing trend along the direction close to the grid sheet group. According to the arc extinguish chamber, the arc extinguish cavity is divided into the at least two arc extinguish channels, the transfer speed of the arc can be increased through the multiple arc extinguish channels, and then the arc extinguish effect of the arc extinguish chamber is improved; the configuration of the first contraction area can generate inward suction force to the arc and can further increase the speed of the arc entering the arc extinguish chamber, so that the arc extinguish effect of the arc extinguish chamber can be further improved.

The utility model discloses an energy-saving fluid motor resistant to high pressure and pressure pulsation, and relates to the technical field of hydraulic motors, the energy-saving fluid motor comprises a motor body, cup-shaped blades, an output wheel shaft and a shock wave recoverer; the periphery of the output wheel shaft is connected with a plurality of cup-shaped blades; the motor body is further provided with an oil inlet channel, an oil outlet channel and a shock wave channel. The large pulse flows through a shock wave recoverer at the bottom of the shock wave channel, is boosted and stabilized and then enters a flow-aiding channel and a braking channel on the two sides; a flow-aiding control valve is connected in the flow-aiding channel, and a brake control valve is connected in the brake channel; when the flow-aiding control valve is opened, the cup-shaped blade drives the output wheel shaft to rotate under the impact of incoming flow in the oil inlet channel and the flow-aiding channel; when the brake control valve is opened, the brake channel conveys the pulsating flow subjected to pressure boosting and pressure stabilizing into the cup-shaped blades, rotation of the cup-shaped blades is hindered, and the output wheel shaft can achieve flexible semi-brake under the action of opposite torque.

A gas supercharging device for a beverage barrel comprises a gas storage container with an opening in the upper end, an inner cover body arranged in the opening, a fixing part with a through hole formed in the middle of the gas storage container in a protruding mode, and a fixing groove formed in the bottom face of the gas storage container; a cover body is arranged at the upper end of the gas storage container; an adsorption substance is placed in the gas storage container; the pressure difference control mechanism comprises a piston arranged in the cover body, a mounting through hole is formed in the middle of the piston, a fixing sleeve with an opening in the lower end is arranged in the piston, and the lower part of the fixing sleeve expands outwards to form a first fixing step; the upper end and the lower end of the compression spring abut against the inner wall of the cover body and the upper end face of the piston; the lower part of the valve rod is inserted into the gas storage container from the through hole of the fixed part, a gas channel is formed in the upper part of the valve rod, and an annular groove is formed in the lower part of the rod body; the upper part of the valve body sleeves the lower part of the valve rod, and the upper end is inserted into the fixing groove of the fixing part; a second fixing step protrudes from the lower part of the inner wall of the valve body; the upper and lower ends of the spring abut against the bottom of the valve rod and the second fixed step; the trigger pushing piece comprises a fixed bottom plate with a through hole in the center; the three trigger pieces are arranged on the outer edge of the fixed bottom plate, and pushing parts are arranged on the lower portions of the trigger pieces and abut against the upper end face of the valve rod.

The utility model provides a cooking utensil which comprises an inner container, a rice soup collecting box, a rice soup channel and a pressure control assembly, the rice soup channel is connected with the inner container and the rice soup collecting box, redundant rice soup in the inner container can be conveyed to the rice soup collecting box through the rice soup channel in time, and the pressure control assembly comprises a control valve and a pressure adjusting piece. The control valve can control the rice soup channel to be closed or opened and is used for controlling the rice soup channel to be opened at proper time so that rice soup can flow into the rice soup collecting box, the connecting port is controlled to be communicated with the inner container or the rice soup collecting box according to needs, the pressure adjusting piece works, and the pressure difference between the inner container and the rice soup collecting box is increased. According to the cooking utensil, the rice soup can be pressed into the rice soup channel through the pressure difference generated between the inner container and the rice soup collecting box without additionally arranging a long pipeline extending into the rice soup in the inner container, the overall structural arrangement in the cooking utensil is simplified, the cleaning difficulty is reduced, and the use feeling is optimized.

The present invention relates to a three-dimensional distributed liquid atomizing heat exchanger and a control method, a refrigeration system, and an air conditioner. A three-dimensional distributed liquid atomizing heat exchanger of the present invention includes a shell, an air extraction device, a heat exchange device, and a liquid atomizing device. The air extraction device is used to form a negative pressure in the shell; the liquid atomizing device includes a liquid supply pipe, an atomizing exhaust pipe, and an atomizing head. The atomizing exhaust pipe is connected to the liquid supply pipe, and the atomizing head is arranged on the atomizing exhaust pipe. The atomizing exhaust pipe is three-dimensionally distributed in the shell. A control device for controlling the opening or closing of the atomizing head is arranged on the atomizing head, and the control device is connected to the control center. Its beneficial effect is that the control center can randomly select the atomizing head that needs to be opened or closed according to the set time and the set opening ratio of the atomizing head according to the random function. The opening or closing of each atomizing head is random, so as to achieve the effect of uniform atomized liquid in the shell.

The invention provides a read auxiliary circuit for a memory, a control method, the memory and electronic equipment. The read auxiliary circuit comprises a switching device and a negative voltage generation sub-circuit; the first end of the switching device, the first end of the negative voltage generation sub-circuit and the grounding end of the level amplification circuit are coupled to a first node, the second end of the switching device is grounded, and the control end of the switching device and the second end of the negative voltage generation sub-circuit are coupled to a second node to receive a driving signal. When the driving signal is a first electric signal, the switching device is in a conducting state, so that the voltage at the first node is a first voltage value; when the driving signal is a second electric signal, the switching device is in an off state, and the negative voltage generation sub-circuit can generate a second voltage value at the first node; the second voltage value is smaller than the first voltage value. On the premise that read delay is not increased, the amplification efficiency of the sensitive amplifier can be improved, it is guaranteed that data of a memory are successfully read, and the performance of the memory is remarkably improved.

This utility model discloses a hydraulically retractable retrieval cylinder, comprising: an upper connector, a guide sleeve, a connecting cylinder, an elastic component, a slip, a piston rod, a piston, a plug, an adjusting shim, and several sealing rings. A flow guide hole is provided on the piston rod, positioned outside the piston's sealing ring when the elastic component is in its initial position; and inside the piston's sealing ring when the elastic component is in a compressed state. During fish retrieval, regardless of the fish's shape, upon retrieval, the flow guide hole is blocked, causing pressure buildup. This results in a significant increase in pump pressure, allowing for accurate determination of fish retrieval.

The utility model provides a kind of continuous sewage silicon dioxide flocculation recovery device, it is related to water treatment technical field, including expansion tank, the middle part of expansion tank is provided with partition baffle, the partition baffle is divided into flash chamber and flocculation chamber in expansion tank, the side wall middle part of flash chamber is connected with water inlet, the water inlet is connected with shower head assembly inside, the top of flash chamber is provided with plate heat exchanger, flocculation tank is fixedly installed in flocculation chamber, several aluminum base electrode plates are installed in flocculation tank, driving shaft is rotatably connected in the middle part of flocculation tank, driving motor is fixed in the top of flocculation tank, the output end of driving motor is connected in driving shaft top, several stirring scrapers are installed on driving shaft.The utility model is in by being arranged cooling section in expansion tank, the wastewater that enters into flocculation tank is kept in suitable flocculation temperature range, avoid the corrosion of high temperature to aluminum base electrode plate.