58results about How to "No negative pressure" patented technology

This invention relates to a side span closure method for a continuous rigid bridge without down-to-the-ground frames including selecting a ratio of side span/middle span in the sphere of 0.54-0.56, laying out and designing sections in terms of the river course hydrogeological condition, designing and analyzing it to select suitable sections to arrange ordinary steel bars and prestressed bars and drafting a construction pattern, symmetrically casting in terms of each T, selecting one way to finish side span closure: A the side span site-cast handing basket is extended and moves forward, the other end is supported on a side pier, utilizing the suspending arm and the side pier to bear the basket to site cast the closure section, B removing the basket and matching the truss beam on the beam and side pier an hanging forms.

This invention relates to a biological material ball stove including a fan, a secondary wind pipe, a valve, a flowmeter, a supply pipe, a gasification agent pipe, a loop air pre-heating chamber, a loop air conduction chamber, a stove head, a stove body, a heat preservation layer, an inner container and biological material balls, in which, the upper part of outside of the stove is a water tank made of stainless steel, the fan is connected with the loop air pre-heating chamber at the bottom of the hearth via a gasification agent pipe, the heat preservation layer, the inner container and the hearth are orderly placed in the body, a grate is under the hearth and the stove head is above it, the loop air conduction chamber is at the bottom of the head, the secondary wind pipe and the chimney are at the outside wall of the conduction chamber with a stage along the internal wall for placing a stove cover.

The present invention discloses a device capable of supplementing water and increasing pressure for running water pipeline. Said device includes the following components: electric valve, check valve, water pump and water-collecting tank, and said device is controlled by microcomputer. Said invention also provides its working principle and its operation method.

The invention relates to an anti-negative-pressure water nozzle comprising a housing with an axial passage. The housing is provided with a water inlet and a water outlet. The anti-negative-pressure water nozzle is characterized in that the housing is further provided with an air inlet communicated with the water outlet, a valve shell is disposed inside the axial passage, the rear of the valve shell is provided with a seal capable of sealing the air inlet, the valve shell is held to keep in the state of moving forward by a first spring inside the axial passage, a sealing ring is disposed between the outer periphery of the valve shell and the inner peripheral wall of the axial passage, the valve shell is provided with an inlet and an outlet, a plug is disposed inside the valve shell, the plug is held to keep in the state of sealing the inlet by a second spring inside the valve shell, and the force of the first spring upon the valve shell is smaller than that of the second spring upon the plug. After liquid passes the nozzle, no residual liquid remains inside; the nozzle is ventilated and is cleaner; when applied to a coffee maker, the nozzle allows the air inlet to be automatically sealed during coffee making, and air is prevented from mixing in coffee to affect the effect of the coffee.

Provided is a damping device for a support post in an irrigator stand, which prevents the support post from rapidly falling with a simpler configuration. As the damping device 13, a plug member 7 closing the lower end side inside a base part column 3a and a damping valve 14 of a cap shape to be closely slid on the inner wall of the base part column 3a facing the plug member 7 on the lower end part side of the support column 3b are provided. The plug member 7 is provided with an air flow path 15 communicating with a space inside the base part column 3a and the outside of a bottom surface along the outer periphery of the axial direction. In the meantime, for a valve part 14b in the damping valve 14, the outer peripheral part is spread in a tapered shape, a space part G is formed between the damping valve and a grounding part 14c on the inner side of the valve part 14b, and a cylindrical hollow part Rg is formed at the grounding part 14c. A surface area is enlarged by the cylindrical hollow part Rg and the space part G on the inner side of the valve part 14b, and an air damping function is improved.

The invention discloses a method for configuring the closing rule type of guide vanes of a pumped storage power station according to different water heads. According to the method, the water heat altitude is used as the standard when a proper guide value closing rule is selected for the pumped storage power station. When the method is applied, the optimal guide vane closing rule is selected for the pumped storage power station according to the different water heads; a linear closing rule is adopted for the high water head, so that operation steps are effectively simplified, and operation errors are reduced; a delay linear closing rule is adopted for the medium water head, so that operation is easy, and it can be guaranteed that the lowest dynamic piezometric level of a front joint of an upward bent section of a water guide channel is higher than a safety value under a water pumping working condition; a gradually-decelerating two-section fold line type closing rule is adopted for the low water head. The optimum is guaranteed both under the water pumping working condition and under a power generation working condition, the requirement for regulation and guarantee calculation is met, and it is guaranteed that no negative pressure is generated during stable operation of a unit.

The invention discloses a non-vacuum frequency-variable water supply device. The non-vacuum frequency-variable water supply device includes a water inlet pipe; two control valves are arranged on the water inlet pipe; a water taking pipe is arranged on the water inlet pipe between the two control valves; one end away from the water inlet pipe, of the water taking pipe is connected to a water takingtank; three parallel inclined plates are arranged in the water taking tank from top to bottom; water outlet sampling pipes corresponding to the three inclined plates are arranged on a side wall of the water taking tank; one end of the water inlet pipe communicates with a steady flow adjustor; a vacuum suppressor and a pressure meter are arranged on an upper end of the steady flow adjustor; a waterless stopping liquid level floating ball is arranged in the steady flow adjustor, and is connected to the vacuum suppressor through a connection line; a lower end of the steady flow adjustor has a blowoff valve; and the lower end of the steady flow adjustor has a fourth connection pipe. The non-vacuum frequency-variable water supply device can constantly detect the water quality in a water supplyprocess, can improve the water safety, and can be promoted.

The invention provides a cooking utensil, a control method and device of the cooking utensil and a computer readable storage medium. The control method comprises the following steps of S10, judging whether an instruction of entering a fresh-keeping mode is received or not; if yes, executing the step S20, and in the fresh-keeping stage, controlling an exhaust device to be turned off to ensure thata cooking cavity does not communicate with the outside; and if not, executing the step S30, and entering a conventional cooking mode. According to the control method, when cold air needs to be discharged, the exhaust device is controlled to be turned on, the cooking cavity communicates with the outside, and the cold air can be discharged, so that a float can be removed, the situation that the negative pressure cannot be generated because the cooking cavity cannot be sealed due to fallback of the cooled float is avoided, and the cost of the cooking utensil is reduced by removing the float. In the fresh-keeping stage, the exhaust device is controlled to be turned off, so that the cooking cavity is isolated from the outside and the cooking cavity is internally sealed; and as food materials and the air in the cooking cavity are cooled, the negative pressure is formed in the cooking cavity, and the preservation time of food is prolonged.

The invention provides a hollow post insulator. The hollow post insulator comprises a hollow insulating tube, an umbrella skirt which wraps and is fixed on a periphery of the hollow insulating tube, flanges connected to two ends of the hollow insulating tube, and an end sealing structure arranged in the hollow insulating tube. According to the hollow post insulator, the two ends of the insulatingtube are plugged by adopting the end sealing structure; the end sealing structure has two layers, one layer is a sealing end resin layer, and the other layer is a moisture absorption resin layer; anda micro-water content in the insulating tube can be kept below a standard value while sealing performance is ensured, and an internal insulation effect of the insulator is not influenced. The hollow post insulator is filled with a dry gas of 0.1-0.15 Mpa, and the insulator can be suitable for various altitudes and a negative pressure condition is not generated due to a micro-positive pressure state.

The present invention discloses the running water pipeline direct pressurization equipment. Said equipment includes the components of electric valve, check valve, water pump and water-collecting tank. Said equipment is controlled by microcomputer. Said invention also provides the working principle of said equipment and its operation method.

The invention discloses an air efficiency optimization system for a clean space. The cleaning space is provided with a fresh air system, an air exhaust system and a production line. The efficiency optimization system comprises a controller, wherein the input end of the controller is connected with an air pressure detection module, a temperature and humidity measurement module, an oxygen content detection module, a solid particulate matter detection module and a linkage detection device which is connected with the production line, the output end of the controller is connected with the fresh airsystem and the air exhaust system, and the controller can be linked with the production line and can adjust the start-stop sequences, start-stop time and power of the fresh air system and the air exhaust system according to the air pressure and the air quality of the clean space, so that no negative pressure is generated in the clean space. Outdoor air which is not purified is prevented from entering the clean space from door seams, window seams and the like, moreover, the situation that positive pressure is generated in the clean space, so that clean air is wasted is avoided, and the air efficiency optimization system is environmentally friendly and high in reliability and saves energy.

The invention discloses a tap water flow control system. The tap water flow control system includes a steady flow adjustor, a frequency-variable water supply control cabinet, second water pumps, and atransmissible pressure gauge; the steady flow adjustor communicates with a water inlet pipe; a vacuum suppressor and a pressure meter are arranged on an upper end of the steady flow adjustor; a waterless stopping liquid level floating ball is arranged in the steady flow adjustor, and is connected to a vacuum suppressor through a connection line; the second water pumps, the vacuum suppressor, andthe transmissible pressure gauge are connected to the external frequency-variable water supply control cabinet through wires; and when water is coming or cut off, a liquid level detector can feed a signal back to a frequency-variable controller; the water pump is automatically started or stopped so as to protect a water pump set. When the water flow is small at nighttime and the pressure of a tapwater pipe cannot meet a demand, an air pressure tank can store and release energy so as to prevent frequent start of the water pumps, and in this way, the stability of water supply can be ensured, and a good energy-saving and emission reduction effect can be achieved.

The invention relates to the technical field of buildings, and provides a large-span prestressed bealock beam, a bealock structure, a maritime work pool and a construction method. The large-span pre-stress bealock beam comprises a pre-stress supporting structure which is arranged in the first direction and connected with an environment structure, and the pre-stress supporting structure is a pre-stress beam; the coping beam is connected with the prestress supporting structure, and at least one plane of the coping beam is arranged to be an assembling face of the bealock beam. The large-span pre-stress bealock beam has the beneficial effects that the large-span pre-stress bealock beam is divided into the pre-stress supporting structure and the coping beam, so that the influence of deformation of the pre-stress supporting structure on the coping beam is reduced to the greatest extent, and the flatness of the assembly surface of the coping beam is improved; therefore, the high-precision requirement of the maritime work pool large-span bealock beam is met.

The invention relates to a pressure-superposed water supply pumping station. When equipment works, a tap water protecting device is hydraulically controlled, so that the higher the pressure of tap water, the greater the degree of opening, and the more the excess flow; when the pressure of tap water is normal, the tap water protecting device is automatically turned on, a water pumping set operates at variable frequencies to carry out the superposed pressure boosting to supply water to users, accordingly, each pump in the water pumping set can perform the superposed pressure boosting water supply on the pressure basis of the tap water to achieve the energy saving purpose. When the tap water pressure is reduced and flow cannot meet the use requirement of users, the degree of opening of the tap water protecting device is reduced to protect the pressure of tap water from being continuously reduced; meanwhile, a system controls a normally open solenoid valve to turn off and a normally closed solenoid valve to turn on, a pressure boosting superposed pump changes to pump water from a water tank, and the water outflowing pressure of the pressure boosting superposed pump is automatically adjusted, so that the water outflowing pressure and the tap water pressure are matched, storing water in the water tank is pumped by the pressure boosting superposed pump to a water inlet manifold through the normally closed solenoid valve, and the superposed pump is enabled to be simultaneously supplied by the tap water and the storing water from the water tank, and thus water use requirements of the users are met and simultaneously the tap water is enabled to not generate negative pressure.

The invention relates to an auxiliary syringe for pulling out a urinary catheter, comprising an outer barrel, a piston and a push rod. The front end of the outer barrel is provided with a needle seat,the piston is slidably sealed in the outer barrel, a piston cavity is formed between the piston and the closed end of the outer barrel, and one end of the push rod extends into the outer barrel and is fixedly connected with the piston. Characterized in that it also comprises a connecting pipe and an on-off valve, wherein the first end of the connecting pipe is communicated with the piston chamber, the second end of the connecting pipe is communicated with the atmosphere, and the on-off valve is installed on the connecting pipe. The auxiliary syringe of the invention can optimize the pulling-out operation of the urinary catheter, Specifically, before removing the catheter, The on-off valve of the syringe is in a closed state, air is sucked into the piston chamber, the syringe is connectedto the end of the urethral balloon, the liquid in the balloon is sucked out, after the liquid in the balloon is sucked out, the syringe is vertically injected with a small amount of liquid in the balloon, the on-off valve is opened, the urethral catheter is pulled out slowly, and the patient has no obvious uncomfortable feeling such as urethral pain.

The invention discloses a dispensing method for an LC-type optical fiber connector, and provides a dispenser, a flexible needle, and a LC-type optical fiber connector. The dispenser comprises a dispensing cylinder, a connector fixing clamp, a dispenser base, a control computer, and a communication cable. A guide is mounted on the flexible needle. The flexible needle is mounted on the dispensing cylinder. The LC-type optical fiber connector is mounted on the dispenser base. The position of a tail bushing of the LC-type optical fiber connector is determined by pre-mechanical adjustment and positioning or optical positioning and shooting. The distance between the dispensing cylinder of the dispenser and the tail bushing of the LC-type optical fiber connector is controlled by a control system.The control system drives the dispensing cylinder and pushes the flexible needle into the tail bushing of the LC-type optical fiber connector. The flexible needle stops when it reaches a tail handleof a ferrule. The control system drives a piston to move and injects glues into the tail handle. The dispensing cylinder is lifted up while glues are injected. The flexible needle of the invention canbe freely bent and can conform to the bending of the tail bushing when the flexible needle enters the tail bushing. The outer wall of the guide is closely attached to the inner wall of the tail bushing. Since the guide is coaxial with the needle, the needle can be coaxial with the inner wall of the tail bushing to ensure that the flexible needle smoothly enters the tail handle of the ferrule.

The invention belongs to the technical field of methane torches, and in particular, relates to a pressure maintaining type direct ignition methane torch. The pressure maintaining type direct ignition methane torch comprises a general mobile platform, and a water sealing tank fixed on the general mobile platform, wherein a gas incoming pipe, a water replenishing pipe and an overflow pipe are communicated in the water sealing tank; the gas incoming pipe extends into the water sealing tank, and is positioned below a liquid level of the water sealing tank; a dispersing pipe and the gas incoming pipe exhaust methane into the water sealing tank; a dispersing pipe main pipe and a dispersing pipe bypass pipe are communicated to the top of the side wall of the water sealing tank; the communicated place between the dispersing pipe main pipe and the water sealing tank and the communicated place between the dispersing pipe bypass pipe and the water sealing tank are both positioned above the liquid level in the water sealing tank; the dispersing pipe main pipe and the dispersing pipe bypass pipe are both communicated with an intake port of a fire stopper through pipes; the methane passing through water can enter the fire stopper through the dispersing pipe main pipe and the dispersing pipe bypass pipe; a gas outlet of the fire stopper is communicated with a torch head through a pipe; and the torch head can burn the methane.

The invention provides an intelligent pump station. When equipment works, a tap water protection device is hydraulically controlled; when the pressure of tap water is higher, the opening degree is greater and the excess flow is more; when the pressure of the tap water is normal, the tap water protection device is automatically started and an energy-saving converter is started simultaneously; a water pump set is operated in a frequency conversion manner to overlap and pressurize so as to supply water to a user; each pump in the water pump set can carry out overlapping and pressurizing to supply the water on the basis of the pressure of the tap water, so that the aim of saving energy is realized. When the pressure of the tap water is reduced and the flow cannot meet the requirements of the user, the opening degree of the tap water protection device is reduced to prevent the pressure of the tap water from being continually reduced and the energy-saving converter is controlled by a system to work; inflowing water of an overlapping and pressurizing pump is disconnected with the tap water and effluent water of the overlapping and pressurizing pump is communicated with the tap water, so that the overlapping and pressurizing pump pumps water from a water tank; the pressure of the effluent water of the overlapping and pressurizing pump is automatically adjusted, so that the pressure of the effluent water is matched with the inflowing water pressure of the tap water; therefore, the tap water and the water stored in the water tank can be supplied to the overlapping and pressurizing pump at the same time, the water requirement of the user is met and the negative pressure is not generated by the tap water.

A municipal water supply system is disclosed; a water feeding total pipe is connected to a steady flow tank water inlet formed in the top of a steady flow tank; a pressure limiting protective device and a vacuum suppressor are arranged on the top of the steady flow tank; a steady flow tank outlet formed in the bottom of the steady flow tank is connected to one end of a water discharging branch pipe through a water pipe, and the other end of the water discharging branch pipe is connected to a water discharging total pipe; a butterfly valve, a pressure transmitter, a water pump, a noise elimination check valve, and a butterfly valve are successively arranged between an end connected to the water pipe, of the water outlet branch pipe and an end connected to a water discharging total pipe, ofthe water discharging branch pipe; a pressure gage, a diaphragm air pressure tank, and a safe valve are arranged on the water discharging total pipe; and a bypass pipe is arranged in parallel to the water discharging branch pipe. The special independent research and development anti-vacuum suppression system has the vacuum suppressor, the pressure limiting device, and an anti-backflow device, canbe safely and directly connected to a tap water pipeline to achieve pressure-superposed water supply, and will not cause negative pressure of a municipal tap water pipeline.

This invention relates to a biological material gasifying field including: a fan, a flowmeter, a water tank, a loop gas-collecting chamber, a hearth, a purifier, a stove, a heat preservation layer, a loop air-preheating room, a grate, a gasification agent tube and biological balls characterizing in applying vapor and air or air as the gasification agent and applying specially made biological balls of honeycomb balls as the raw material to produce combustible gas, in which, the upper part of the outside of the stove is a water tank made of stainless steel, the fan is connected with a loop air preheating chamber at the bottom of the hearth via the gasification agent tube, the heat preservation layer, the inner container and the hearth are orderly set in the stove, the grate is under the hearth and an ash chamber is under the grate, the loop gas collecting chamber is above the inner container and is connected with a strong fire stove, a gas stove and a heating stove via the gas conduction tube and the purifier, the end of the gas conduction tube is the chimney with a valve on it.

The invention discloses a condensed water latent heat utilization device in a split air conditioner unit. The condensed water latent heat utilization device comprises a water discharging plate arranged above a condenser in an outdoor unit, a condensed water outlet in an indoor unit of the split air conditioner unit is connected with a water inlet of the water discharging plate in the outdoor unit through a hose, and a plurality of dripping holes are formed in the bottom of the water discharging plate. Condensed water generated by the indoor unit passes through the hose and the water discharging plate and falls to the condenser through the dripping holes for dissipating heat of the outdoor unit. The surface temperature of fins of the condenser is high in summer, after the condensed water latent heat utilization device is utilized, the condensed water with the temperature being about 10 DEG C to 12 DEG C of water flow discharged by the indoor unit is evenly splashed to the surfaces of the fins of the condenser, the effect of cooling and heat removing of the fins of the condenser is greatly improved, meanwhile, in the process that the condensed water falls to the surfaces of the fins of the condenser and is in contact with the air, most of the condensed water will be vaporized(water absorbs heat when being vaporized), and the temperature of the surfaces of the fins of the condenser and the temperature of the air are reduced in the vaporizing process.

The invention provides a three-way valve structure which is simple in structure, long in service life, low in noise and good in sealing performance. The valve comprises a valve body; a water inlet path, a first water outlet path, a second water outlet path, a cavity and a sealing frame are arranged in the valve body, the first water outlet path communicates with an upper end opening of the cavity,the second water outlet path communicates with a lower end opening of the cavity, and the water inlet path communicates with a side end opening of the cavity; the sealing frame comprises an upper sealing ring matched with the upper end opening of the cavity and a lower sealing ring matched with the lower end opening of the cavity, the upper sealing ring is connected with the lower sealing ring through a connecting piece, the sealing frame is embedded in the cavity, a stretching assembly is arranged on the valve body, and the stretching assembly comprises a driving shaft. The lower end of thedriving shaft penetrates through the sealing frame and is provided with an upper piston and a lower piston, the upper piston is located above the upper sealing ring and matched with the upper sealingring, and the lower piston is located below the lower sealing ring and matched with the lower sealing ring. The invention can be applied to the technical field of three-way valves.

The invention relates to the field of civil engineering indoor geotechnical testing, and particularly relates to a graded loaded sample preparation method of a cement soil direct shear sample. A sample preparation device includes a pressure applying mechanism, a sample bearing mechanism, a supporting mechanism and a cutting mechanism; the sample bearing mechanism is mounted on the supporting mechanism; the pressure applying mechanism can cooperate with the sample bearing mechanism to apply pressure to the cement soil to obtain a mother sample; and the mother sample is pushed from the sample bearing mechanism into the cutting mechanism and cut into a number of standard samples. After adopting the above scheme, a number of samples can be prepared at one time, the artificial error among the samples can be eliminated, and the actual stress condition of the cement soil on site can be simulated through the graded loaded sample preparation process, so that the test results are closer to the site conditions.