11results about How to "Stable negative pressure" patented technology

The invention provides a method and a system for automatically taking and placing a cover plate in a thermal-state shell transfer process, relates to the technical field of casting machinery, and aims to solve the problems of low operation efficiency, poor safety and insufficient automation level of manual cover plate taking and placing in related technologies. The method comprises the following steps: step S110, executing a cover plate taking preparation control flow, and step S120, executing a cover plate taking preparation control flow; and step S130, executing an automatic cover plate taking control process, and step S130, executing a cover plate placing and recycling control process. Through full-automatic time sequence control and negative pressure adsorption state feedback, the uncertainty of thermal state shell temperature drop is remarkably reduced, the occurrence rate of casting shrinkage porosity and cold shut defects is reduced, and meanwhile complete unmanned cover plate taking and placing operation in the high-temperature environment is achieved.

A control device for an internal combustion engine is disclosed. The objective of this invention is to establish a stable negative pressure in the intake passage during engine startup. The internal combustion engine includes a fuel injection valve for supplying fuel to the cylinders and a throttle valve disposed in the intake passage for adjusting the intake air volume. An electric motor for driving the motor is connected to the crankshaft. The control device performs the following process: during engine startup, while driving the motor, it controls the opening of the throttle valve and the engine speed, thereby adjusting the pressure in the intake passage downstream of the throttle valve to a target value below atmospheric pressure; and after the pressure in the intake passage is adjusted to the target value, it begins injecting fuel from the fuel injection valve.

The utility model provides a kind of cupping apparatus for department of traditional chinese medicine, to solve the poor sealing of existing cupping apparatus, inconvenient operation and unstable cupping effect problem.The cupping apparatus includes a cup body with lip, through the lip of silicon rubber material and fluorine rubber sealing ring, enhance the contact area of cup body and skin, effectively improve the sealing, prevent gas leakage, ensure the stability of negative pressure in the process of cupping.Innovative design of rotating shaft core and knob cooperation limiting platform and positioning hole structure, so that cupping apparatus operation is more accurate, flexible, solve the problem of inconvenient operation of traditional cupping apparatus.At the same time, the cooperation of positioning bolt, connecting rod and concave ring, combined with spring force, so that user can easily operate, improve the convenience and comfort.The application improves the sealing of cupping apparatus, operation convenience and cupping effect through a series of structural innovations, improves the deficiency of traditional cupping apparatus in use process, ensures the safety and effect of use process.

The utility model discloses a water reducing agent concentration detects with sampling device, including empty cylinder, the empty cylinder outer surface fixedly connected with the connecting box, and the empty cylinder top insertion has the piston rod, and the connecting box is away from the piston rod one side and is equipped with the window, and the piston rod bottom fixedly connected with the piston main part, and the connecting box inside slide connection has the ration sampling mechanism, and the connecting box one side fixedly connected with the check valve mechanism, and the ration sampling mechanism includes the extrusion board, rubber block, spring no.

This utility model discloses a side-blown furnace feeding structure, including a feeding hopper, a weighing alarm component, a feeding port vertical pipe, and a furnace top cover horn-shaped feeding port. The feeding hopper vertical pipe is coaxially inserted into the feeding port vertical pipe to form an annular gap channel. The weighing alarm component includes a weighing sensor fixed to the outer wall of the feeding hopper, an alarm device electrically connected to the sensor, and an interlocking stop feeding execution mechanism. When the feeding hopper accumulates material due to blockage, the weighing sensor monitors the weight change in real time and triggers the alarm device, simultaneously stopping the feeding. The horn-shaped opening of the furnace top cover feeding port faces the furnace chamber, reducing the contact between the material and the inner wall, reducing adhesion and slag formation. The annular gap channel forms an air guiding cavity, maintaining stable negative pressure inside the furnace, preventing flue gas from escaping, and improving smelting safety and efficiency.

The present application relates to the technical field of lead-acid battery manufacturing, and particularly relates to a lead-acid battery vacuumizing and acid-adding device, which comprises a conveying belt, an acid-adding tank, a three-way valve, an acid storage mechanism, an acid-adding pipeline, a filling mechanism, an adjusting mechanism, a vacuum system and a control system. The three-way valve core is provided with valve holes one, two and three, and a closed arc surface. The filling mechanism is provided with a sealing plunger, which blocks the filling needle head during vacuumizing and opens during acid injection. After the vacuum system vacuums the battery, the acid storage mechanism injects pre-stored quantitative acid into the battery under negative pressure. The lead-acid battery vacuumizing and acid-adding device realizes accurate control of acid quantity, elimination of bubbles and automatic continuous production, and has the advantages of high acid-adding precision, high efficiency and good battery consistency.

The invention discloses a multifunctional atomization drug delivery device for an organ transplantation patient, relates to the technical field of medical instruments, and is used for solving the problems that an existing device is long in backflow guide-back path, much in residual liquid, difficult in drug path switching and sequential drug delivery and the like, and the multifunctional atomization drug delivery device comprises a patient end drug delivery module located at the near end and used for outputting oxygen-containing drug mist to the patient; the mixed oxygen supply module is connected with an air path of the patient end administration module and is used for inhaling and atomizing the liquid medicine under the action of oxygen flow; the medicine supply module is arranged in the mixed oxygen supply module, and the middle and the bottom of the medicine supply module are respectively communicated with the mixed oxygen supply module so as to realize reutilization of the liquid medicine; and the cleaning and drying module is mounted in the middle of the mixed oxygen supply module and is communicated with the patient end dosing module. The device has the effects of stable backflow, sequential dosing and rapid disinfection.

This invention provides a rotary kiln head device and sealing method, including a kiln head cylinder assembly, a sealing device, a kiln head end face assembly, and a feed cylinder. The kiln head end face assembly is fixedly connected to the feed cylinder, and the kiln head cylinder assembly and the kiln head end face assembly are connected by the sealing device. The sealing device includes a labyrinth-type sealing module, a graphite ring sealing module, and a multi-layer composite fish scale sealing module. This invention eliminates the need for a kiln head hood, resulting in a simple device structure. Based on this, a triple seal is employed: a labyrinth-type seal, a graphite ring seal, and a multi-layer composite fish scale seal. The labyrinth seal effectively prevents materials, fly ash, and high-temperature flue gas from entering the sealing gaps and corroding the graphite ring. The graphite ring seal prevents internal high-temperature flue gas from escaping and external air from entering, maintaining stable negative pressure at the kiln head. The multi-layer composite fish scale seal ensures that the feed cylinder and the kiln head end face assembly can rotate smoothly relative to the kiln head cylinder assembly during operation, while simultaneously enhancing the sealing performance and stability.

The integrated vacuum generator comprises a body, a first control device and a second control device, and a first cavity and a second cavity are formed in the body; the two ends of the first cavity are in through connection with the positive pressure cavity and the positive pressure air port respectively, a first valve element is arranged in the first cavity, the first control device is used for driving the first valve element to move so that the positive pressure cavity and the positive pressure air port can be connected or disconnected, and the positive pressure cavity is further connected with the diffusion pipe unit; the two ends of the second cavity are in through connection with the negative pressure cavity and the positive pressure cavity respectively, the negative pressure cavity is further in through connection with the vacuum adsorption opening and the vacuum pump opening, and a second valve element is arranged in the second cavity. The second control device is used for driving the second valve element to move so that the negative pressure cavity and the positive pressure cavity can be connected or disconnected, and the vacuum adsorption opening and the vacuum pump opening can be connected or disconnected. The safety device has good response time, is good in maintaining effect, does not completely depend on the deformation capacity of the material, and can be used in a vacuum pump system as a safety device.

This invention relates to the field of handheld vacuum cleaner technology, and discloses a straight-tube cyclone centrifugal anti-clogging handheld vacuum cleaner, comprising a dust collection and filtration section and a power control section. The dust collection and filtration section has a storage tank and a front cover for the storage tank, while the power control section has a main unit housing and an internal motor. The bottom of the storage tank is connected to the top of the main unit housing. A stainless steel filter screen, a filter element, a filter sponge, and a wind deflector are nested inside the storage tank. The wind deflector is fixed to the top surface of the stainless steel filter screen, and an annular space exists between the outer periphery of the filter assembly and the inner wall of the storage tank. During operation, the dust-laden airflow is guided by the wind deflector into the annular space, forming a high-speed cyclone. Centrifugal force is used to throw large dust particles towards the tank wall and cause them to settle, effectively preventing a large amount of impurities from adhering to the filter screen surface. This invention has a compact structure, significant anti-clogging effect, stable and long-lasting suction power, and good shock absorption, sealing, and easy assembly / disassembly performance.

This utility model relates to the field of assisted reproductive technology, specifically to an embryo transfer tube, comprising a first tube segment and a second tube segment connected to each other. The inner diameter of the second tube segment is larger than that of the first tube segment. A piece of absorbent cotton is placed inside the second tube segment. An annular limiting seat is provided on the inner wall of the second tube segment at the end away from the first tube segment, and the inner diameter of the annular limiting seat is smaller than that of the second tube segment. By setting an annular limiting seat at the end of the larger-diameter second tube segment, this utility model can reduce the air intake cross-sectional area, increase airflow resistance, and make the negative pressure generated by the suction bulb more gradual. This facilitates the operator's precise control of the embryo aspiration position, thereby reducing the risk of embryos being accidentally aspirated into the second tube segment. Simultaneously, the absorbent cotton placed inside the second tube segment further intercepts any embryos and fluids that may be accidentally aspirated.