13results about How to "Reduce negative pressure" patented technology

The invention relates to the technical field of workpiece conveying, and particularly discloses a workpiece conveying device for a laser cutting machine, which comprises a moving frame, a mounting frame and a driving part I for driving the mounting frame to move along the vertical direction, and two groups of sucking disc assemblies I which are symmetrically arranged left and right and a sucking disc assembly II which is positioned between the two groups of sucking disc assemblies I are arranged at the bottom of the mounting frame; the mounting frame is provided with a second driving piece for driving the first suction cup assemblies or the second suction cup assemblies to move in the vertical direction, and the mounting frame is further provided with a third driving piece for driving the two first suction cup assemblies to move close to each other or away from each other. According to the workpiece conveying device for the laser cutting machine, before an aluminum plate is lifted, the two side edges of the aluminum plate are tilted upwards firstly, at the moment that the aluminum plate is lifted, air can enter the position between the upper aluminum plate and the lower aluminum plate from the left side and the right side of the aluminum plate, the situation that large negative pressure is formed between the grabbed aluminum plate and the adjacent aluminum plate below is improved, and the working efficiency is improved. And the aluminum plate can be smoothly grabbed, and normal feeding of the aluminum plate is guaranteed.

The utility model relates to the field of hydraulic dams, in particular to a hydraulic dam damping flow-guiding back plate structure which comprises a gate leaf, an upper damping flow-guiding back plate and a locking device. The lower end of the gate leaf is rotationally fixed to an installation base, a water breaker is arranged at the upper end of the gate leaf, a fixing base is arranged on the back face of the gate leaf, and an upper supporting rod is arranged on the fixing base; the lower end of the upper supporting rod is connected with the lower supporting rod, the lower end of the lower supporting rod is connected with the locking device, and the upper damping flow guide back plate is arranged on the side face of the upper supporting rod. Overflowing water flow can be prevented from directly impacting an oil cylinder and other structural components behind the gate, equipment damage caused by water flow impact is prevented, and the service life of equipment is prolonged; the design of the flow guide grooves in the back plate can guide water flow to flow downstream in order, the negative pressure area formed by water flow scouring is effectively reduced, and the adverse effect of the water flow on the stability of the dam body is reduced.

This invention relates to the field of automotive parts technology, and provides a dual-valve controlled PRV valve, comprising: a valve seat having an intake chamber and an exhaust chamber therein, the intersection of which forms a cavity with one end communicating with the outside air; a piston movably inserted into the cavity, with an exhaust hole penetrating the first and second parts at the center of the piston; a diaphragm movably connected to the upper end of the piston; a spring sleeved on the outer wall of the piston, with the end of the spring abutting against the diaphragm on the moving side; and a seal disposed within the cavity. Compared with the prior art, the advantage of this invention is that by providing a seal within the valve seat that seals the piston and the cavity, when the negative pressure in the cavity is high, the seal and the diaphragm together achieve a seal on the intake and exhaust chambers. Under the same operating conditions, this makes it easier to achieve the sealing function, preventing excessively low crankcase negative pressure and ensuring normal engine starting.

The invention discloses a medical melt-blown non-woven fabric performance detection device, and belongs to the technical field of melt-blown non-woven fabric production.The medical melt-blown non-woven fabric performance detection device is provided with a transmission mechanism, a solution pressurizing mechanism, a gas pressurizing mechanism and a spraying mechanism, and liquid in a liquid pressurizing cavity and gas in a gas cavity are mixed and enter a mixing channel; the gas is guided into the gas-liquid storage cavity through the mixing channel for temporary storage, the gas is accelerated under the pushing of pressure to form turbulent flow, and the turbulent flow carries the liquid to reach the guide pipes through the channel and is ejected to two surfaces of the non-woven fabric through the two guide pipes, so that the waterproofness of the front surface and the water permeability of the back surface of the non-woven fabric are simultaneously tested; the wearing comfort degree is determined by the balance of the waterproofness and the air permeability of the two sides.

The present disclosure relates to a pipeline machine. The pipeline machine comprises a machine body, a heating assembly and a flow limiting assembly. The machine body has a water inlet pipeline, a water tank and a water outlet pipeline. The water inlet pipeline is in communication with a water inlet of the water tank. The flow limiting assembly comprises a multi-stage connecting pipeline and a flow limiting pipeline. A first-stage connecting pipeline in the multi-stage connecting pipeline is in communication with a water outlet of the water tank through the heating assembly. A last-stage connecting pipeline in the multi-stage connecting pipeline is in communication with the water outlet pipeline. Adjacent two-stage connecting pipelines in the multi-stage connecting pipeline are in communication through the flow limiting pipeline. An inner diameter of the flow limiting pipeline is smaller than an inner diameter of each connecting pipeline, and the inner diameter of the flow limiting pipeline decreases or is equal along a water flow direction. The embodiment of the present disclosure can reduce the sound of bubble flow and water flow noise.

The utility model discloses a suction-sweeping type sweeper suction nozzle, which belongs to the technical field of sweeper suction nozzles, and comprises two suction nozzle shells, a connecting frame, a suction mechanism, a separation mechanism, a suction mechanism and a suction mechanism, the connecting frame is arranged between the two suction nozzle shells and is used for connecting the two suction nozzle shells, the suction mechanism is arranged on the suction nozzle shells and is used for sweeping leaves and dust, and the separation mechanism is arranged in the suction nozzle shells and is used for assisting the suction mechanism in sweeping. The gathering mechanism is arranged on the suction nozzle shell and used for gathering garbage, and the mounting mechanism is arranged on the top side of the suction nozzle shell and used for mounting the suction nozzle shell on the sweeping vehicle. According to the utility model, the contained garbage is sucked into the garbage truck through the negative pressure environment by utilizing the negative pressure pipe and the negative pressure chamber, meanwhile, the airflow generated when the garbage truck generates negative pressure is injected into the air blowing pipe and the inclined nozzle, and the inclined nozzle blows air to the ground within an angle range of 30-40 degrees, so that the condition that leaves are attached to the ground can be disturbed, and the effect of preventing the leaves from being attached to the ground is achieved. And the purpose of enhancing the equipment cleaning effect is achieved.

This invention discloses a control method, system, equipment, and medium for a nitrogen-sealed split-range regulating valve in a storage tank, relating to the field of petrochemical production technology. The invention includes obtaining the design pressure value P of the nitrogen-sealed storage tank. S The invention monitors the real-time pressure P inside the nitrogen-sealed storage tank. When material increases in the tank, it automatically releases nitrogen gas from the top; when material is released, it automatically replenishes nitrogen gas from the top. Specifically, based on the monitored real-time pressure inside the nitrogen-sealed storage tank, logic control is used to control the opening degree of the nitrogen regulating valve and the vent regulating valve. This invention enables the pressure of the nitrogen-sealed storage tank to be controlled within a certain range, rather than a fixed value, reducing the frequent operation of the nitrogen valve and vent valve in each segmented control valve. It also allows for quantitative control of the valve opening, reducing nitrogen and material consumption and improving safety.

Hollow hump type ecological slope protection structure: composed of a hump part and a plane part, the hump part includes a hump solid part and a hump hollow part, the plane part includes a plane solid part and a plane hollow part; the hump part is a strip boss composed of the solid parts on both sides of the hump and the plane solid parts on the top, rectangular holes are opened in the solid parts on both sides of the hump, and the hump hollow part is used for wave dissipation and water permeability; the plane part is the plane solid part at the bottom between the two humps, and rectangular holes are opened in the plane solid part, and the plane hollow part is used for wave dissipation and water permeability. The present invention has good energy dissipation effect, can effectively absorb wave energy, reduce water climbing, reduce wave height, help reduce the impact of waves on the structural stability of hydraulic structures, and control land water and overtopping. The present invention itself has good stability. Due to its high water permeability, the negative pressure is small when the wave trough acts, and the wave force it is subjected to is also relatively small.

The invention relates to the technical field of gastroenterology department gastric lavage, and particularly discloses a gastroenterology department gastric lavage device which comprises a workbench, a coarse filter part, a fine filter part and an intubation tube, the coarse filter part and the fine filter part are connected to the workbench and used for filtering cleaning fluid, and the intubation tube is connected with the fine filter part. The cleaning liquid enters the human body by being inserted into the working table, the detection assembly is connected to the working table, the detection assembly is connected with the second conveying pipe, and the detection assembly is used for monitoring clarity of discharged liquid and detecting whether toxic waste liquid in the stomach of a patient is completely discharged or not by detecting light transmittance of excrement. When the detection assembly detects that the light transmittance reaches a standard value, the negative pressure adjusting assembly can be automatically started, the negative pressure in the first conveying pipe is reduced, the negative pressure adjusting assembly is started, the negative pressure in the first conveying pipe can be reduced, stomach cleaning is stopped, and then the situation that after stomach cleaning is completed, the stomach is still cleaned, and the stomach is prevented from being subjected to secondary damage is avoided.

The invention discloses an efficient dust removal structure. The invention discloses an efficient dust removal structure which comprises an air inducing pipe, an air inlet pipe and an air outlet pipe, a plurality of dust collection ports are formed in the gas collection hood body; the connecting pipes comprise the first connecting pipe, the second connecting pipe to the nth connecting pipe, n is a natural number larger than or equal to 2, the first connecting pipe is communicated between the two adjacent dust suction ports, the second connecting pipe is communicated between the two adjacent first connecting pipes, and the like, the nth connecting pipe is communicated between the two adjacent (n-1) th connecting pipes, and the air inducing pipe is communicated with the nth connecting pipe. The device has the advantage that the dust filtering and removing effects are improved.

The application discloses a conveying device and a surface defect detection device, and belongs to the technical field of printed circuit manufacturing equipment. In the conveying device, a first negative pressure body, a positive pressure body and a second negative pressure body are arranged along the conveying direction from the first conveying mechanism to the second conveying mechanism. The first negative pressure body provides negative pressure suction force to the first air holes on the first conveying belt to flatten the passing flexible sheet material. The second negative pressure body provides negative pressure suction force to the second air holes on the second conveying belt to transition the flexible sheet material from the first conveying belt to the second conveying belt and flatten the passing second flexible sheet material. The positive pressure body provides positive pressure blowing force to the first air holes to pre-lift the flexible sheet material. In one aspect, the flexible sheet material is more conveniently adsorbed on the second conveying belt, and the required negative pressure of the second negative pressure body is reduced. In another aspect, the bending angle of the flexible sheet material during the transition from the first conveying belt to the second conveying belt is reduced, and the phenomenon of creases on the flexible sheet material due to the excessively large bending angle is avoided.

The utility model discloses a breast suction shield and a breast pump, and relates to the technical field of mother and baby products, the breast suction shield comprises a breast suction piece and a fitting piece; a milk sucking channel with two through ends is formed in the milk sucking piece; the attaching part is connected to one end of the milk sucking part, an attaching channel communicated with the milk sucking channel is formed in the attaching part, and the attaching channel gradually shrinks in the direction close to the milk sucking part; wherein a partial pressure channel is formed in the inner wall of the attaching piece, the partial pressure channel is located at the end, close to the breast suction piece, of the attaching piece, and when the attaching piece is attached to the breast, the partial pressure channel is communicated with the breast suction channel. According to the breast suction protective cover, the pressure dividing channel is arranged at the position close to the joint of the attaching piece and the breast suction piece, the negative pressure intensity borne by the mammary areola is reduced, the problem that a circle of red marks are formed at the mammary areola after an existing adsorption protective cover is used for sucking milk is solved, and the use experience feeling of a user is improved.

This utility model discloses a negative pressure prevention device for loading and unloading operations, relating to the field of sulfuric acid pipeline transportation. It includes a pressure-reducing pipe and a first pipeline. A pressure-reducing box is installed at the top of the pressure-reducing pipe, and a connecting box is connected to the top of the pressure-reducing box. A vent pipe is fixed to the end of the connecting box, and a connecting pipe is connected to one side of the pressure-reducing box. A rim is provided on the outer wall of the seal. When the electric valve is closed, the negative pressure inside the first pipeline attracts the seal, causing it to wrap around the top of the pressure-reducing pipe. The negative pressure also draws the rim on the seal inward, creating a gap between the seal and the pressure-reducing box. External gas enters the pressure-reducing box through the vent pipe and flows into the first pipeline through the connecting pipe, thereby filling the negative pressure area inside the first pipeline near the connecting pipe end, reducing the negative pressure and thus protecting the electric valve.