14results about How to "Avoid negative pressure" patented technology

The vibration absorption device comprises a shell and a buffer piston which are coaxially arranged, the buffer piston is sleeved with the shell, and the vibration absorption device further comprises at least two buffer cavities, an oil inlet way and a balance valve which are distributed on the periphery of the buffer piston at intervals in the axial direction; the oil inlet path is arranged on the shell and is communicated with at least one buffer cavity; the buffer cavities are communicated through the balance valves, the balance valves are used for changing the communication relation between the buffer cavities according to the pressure difference between the buffer cavities, the buffer cavities can be communicated in time, the buffer cavities needing oil supplementing are subjected to oil supplementing, sudden pressure drop of the cavities is avoided, and the phenomena of negative pressure and cavitation are avoided. Damage to parts in the rock drill is reduced, and the vibration absorption effect is improved. The second aspect provides a rock drill comprising the vibration absorption device in the first aspect, an impact piston coaxially arranged in the buffer piston in a sliding mode, a bit shank coaxially arranged on the front side of the impact piston, and a plug buffer spacer bush arranged on the impact piston in a sleeving mode and located between the buffer piston and the bit shank.

This invention belongs to the technical field of traditional Chinese medicine extraction equipment, specifically relating to an automated sterilization process for the entire pipeline of traditional Chinese veterinary medicine extraction. This application modifies the entire pipeline of traditional Chinese veterinary medicine extraction to meet the requirements of high-temperature and high-pressure steam sterilization. Before the extraction of traditional Chinese veterinary medicine, high-temperature and high-pressure steam is used to sterilize the entire pipeline. Then, the extraction temperature in the extraction tank is controlled to ensure the sterilization of the extract, thereby ensuring that the final oral liquid meets the sterilization requirements. This saves on the terminal sterilization process and allows for direct filling with non-high-temperature resistant packaging, greatly saving manufacturing costs.

The invention discloses an oxygen cabin exhaust system with a gas source self-adaptive switching function and a control method, and belongs to the technical field of oxygen cabins. Comprising a mask unit, a buffer unit, a suction unit and a switching unit, and the mask unit is used for being in sealing fit with the face of a user; an air inlet of the buffer unit is communicated with the exhaust port of the mask unit, the buffer unit is used for temporarily storing waste gas exhaled by a user, and the internal pressure of the buffer unit changes along with the retention state of the waste gas; the suction unit is a vacuum pump and is arranged outside the oxygen cabin; the switching unit is a mechanical pressure response three-way switching valve and is provided with a first connector, a second connector and a third connector which are communicated, the first connector is connected with the air outlet of the buffer unit, the second connector is exposed in the environment in the oxygen cabin, a valve element is arranged on the second connector, and the third connector is connected with the air inlet of the suction unit; and the switching unit is configured to automatically switch the internal passage according to the pressure difference between the first interface and the second interface. The device is simple in structure, low in cost and high in reliability.

The utility model discloses a dedusting and cooling system device of an underground electromagnetic station, which relates to the technical field of dedusting and cooling of electromagnetic stations and comprises a DN20 ball valve, a DN20 electric valve, a 0-0.8 Mpa pressure regulating valve, a filter, a uniform air circulation device, a stepless speed regulating ventilator, a detection air pressure transmitter and a controller. The DN20 ball valve is installed on a fresh and clean air supply pipeline of an underground chamber, a lower air opening of the DN20 ball valve is connected with the DN20 electric valve, a lower air opening of the DN20 electric valve is connected with the 0-0.8 Mpa pressure regulating valve and the filter, the 0-0.8 Mpa pressure regulating valve and the filter are connected to the uniform air circulation devices, the uniform air circulation devices are installed on the two sides of the wall of the electromagnetic station, and the electromagnetic station is installed on the wall of the electromagnetic station. The stepless speed regulation ventilator is installed on the wall of the electromagnetic station, the detection air pressure transmitter is arranged at the position of an air supply pipe, the output end of the detection air pressure transmitter is connected with the data receiving end of the controller, and the control end of the controller is connected with the DN20 electric valve and the stepless speed regulation ventilator. The problem that energy and cost of heavy-load shutdown are wasted due to the fact that an electromagnetic station cannot dissipate heat is solved.

An anti-siphon anti-backflow drainage system of a dish-washing machine comprises a drainage pipeline connected with an inner container and a drainer, a drainage channel is arranged in the drainer, a respirator is arranged on the drainer, and an air inlet communicated with the outside atmosphere, a first air inlet channel and a first steam channel are formed in the respirator. The drainage pipeline, the first steam channel and the drainage channel are sequentially communicated to form a drainage water channel, and the air inlet, the first air inlet channel and the first steam channel are sequentially communicated to form a first air suction channel; when the drainage waterway drains water, external atmosphere reaches the drainage waterway through the first suction air path. According to the anti-siphon and anti-backflow drainage system, the air inlet communicated with the outside atmosphere, the first air inlet channel and the first water and air channel are formed in the respirator, the first air suction channel is formed, when the drainage waterway drains water, the outside atmosphere reaches the drainage waterway through the first air suction channel, namely air suction is carried out when drainage is carried out; and air pressure balance communicated with the atmosphere is ensured, so that a siphoning effect is prevented.

This invention discloses a separate high-voltage power supply, belonging to the field of high-voltage power supply technology. The separate high-voltage power supply includes an inverter box and a high-voltage tower. The inverter box is connected to the high-voltage tower via two cables. Protective components are respectively installed on the socket surfaces of the inverter box and the high-voltage tower. Each protective component includes a switch fixed to the socket surface and a pressure plate for pressing the switch. A sealed tube for storing dry air is fixed inside the high-voltage tower. By setting up these protective components, when a cable plug is fully inserted into the socket, the plug pushes the pressure plate to press and close the switch, triggering the switch and starting the high-voltage power supply. If any plug is not fully inserted or is loose, the pressure plate does not fully press the switch, and the protective component circuit cannot be energized. This ensures that high voltage is output when each high-voltage plug is fully inserted, preventing the high-voltage power supply from catching fire due to improper plug insertion.

The utility model belongs to the field of medical apparatus and instruments, disclose a kind of medical catheter with coupling liquid compensation function, comprising: catheter seat is equipped with containing cavity, and catheter seat is equipped with injection hole, air hole and first passage;One end of outer catheter is sealedly connected with catheter seat, other end is closed, and outer catheter is communicated with containing cavity and forms second passage;Retracement component is movably arranged in second passage;First sealing ring is arranged in containing cavity;Second sealing ring is arranged in containing cavity;Third sealing ring is fixedly arranged in the outside of retracement component, and first sealing ring and the closed end of outer catheter form first sealed cavity, and second sealed cavity is formed between first sealing ring and third sealing ring, and third sealed cavity is formed between second sealing ring and third sealing ring;Injection hole is communicated with first sealed cavity, and air hole is communicated with second sealed cavity and atmosphere;The both ends of first passage are communicated with first sealed cavity and third sealed cavity respectively.The utility model can avoid the air bubble or deflation in catheter when retracting.

The application discloses a kind of anti-jamming quantitative sampler, including the base with support leg, and support piece is installed on the base, cutting device is arranged on the upper side of the support piece to cut off sample to paper, the cutting device includes a fixedly installed frame on the base, cutting knife is movably arranged on the frame in vertical direction, and operating handle is driven to reciprocate the cutting knife in vertical direction to cut off paper to be cut off;The sampler is further provided with a protective structure, the protective structure is provided with opening for airflow to pass through on both upper and lower sides and forms a channel for the cutting knife to pass through. Openings are respectively provided at the upper and lower ends of the protective structure, so that airflow can flow in the direction of the two openings during the cutting of the cutting knife towards the cutting hole, thereby effectively preventing paper jamming and allowing the paper sampling work to proceed smoothly.

The invention relates to an evaporator (1) for a refrigerant circuit, in particular of a motor vehicle, having a tube-fin assembly (2) with a plurality of tubes (3) and a plurality of fins (4), a first header tank (5) on one side of the tube-fin assembly (2) and a second header tank (6) on the other side of the tube-fin assembly (2), the first header tank (5) having an input chamber (7) and an output chamber (8), wherein the input chamber (7) is equipped with a refrigerant input connection (9) and the output chamber (8) is equipped with a refrigerant output connection (10), wherein a first throttle plate (11) and a second throttle plate (12) are provided in the input chamber (7), which are located in the input chamber (7) spaced apart from one another.

The invention discloses a separated high-voltage power supply, and belongs to the technical field of high-voltage power supplies. A separated high-voltage power supply comprises an inverter box and a high-voltage tower, the inverter box is connected with the high-voltage tower through two cables, the surfaces of sockets of the inverter box and the high-voltage tower are respectively provided with a protection assembly, and each protection assembly comprises a switch fixed on the surface of the socket and a pressing plate used for pressing the switch; a sealing pipe for storing dry air is fixed in the high-pressure tower; by arranging the protection assembly, when the cable plug is completely inserted into the socket, the plug pushes the pressing plate to press and close the switch, so that the pressing plate triggers the switch and the high-voltage power supply is started, and when any plug is not completely tightly inserted or loosened and the pressing plate does not completely press the switch, the circuit of the protection assembly cannot be electrified; therefore, high voltage is output when each high-voltage plug is completely plugged, and ignition of a high-voltage power supply caused by the fact that the plug is not well plugged into the socket is avoided.

The utility model discloses electric steamer, including the base of being equipped with water tank and the juice receiving disc of being placed on the base, be equipped with the water storage cavity and steam generation cavity of independent setting in the water tank, be equipped with the water replenishment channel of limiting water by the water storage cavity flow to steam generation cavity between the water storage cavity and steam generation cavity, and the water storage cavity top is open and forms the water inlet, and the water replenishment channel has the water outlet with steam generation cavity intercommunication and higher than steam generation cavity bottom surface, and the base still includes the water control switch for controlling the opening and closing of water replenishment channel, and the water control switch is used for closing water replenishment channel when the juice receiving disc is separated from the base, and the juice receiving disc is sealed with the base cooperation to water inlet, and the water control switch is used for opening water replenishment channel when water inlet is sealed. The utility model discloses electric steamer, and the user is convenient to the water storage cavity and adds water, and the water is simple and convenient to add, in addition, can also realize the automatic replenishment of a certain water amount to steam generation cavity, to realize the effect of fast steam, prevent dry burning.

The invention discloses a connector technology, and aims to provide a four-core beam-expanding oil-filled optical fiber connector and an assembling method thereof. According to the technical scheme, the oil-filled plug is characterized by comprising a threaded sleeve, a plug shell, a four-optical-fiber beam expanding insulator, a pressure compensator, an oil-filled plug tail clamp, a sealing assembly and a calibration gasket which is clamped between the butt joint end faces of the oil-filled plug tail clamp and the plug shell and used for adjusting the pre-compression stroke of the pressure compensator. The screw sleeve, the plug shell, the four-optical-fiber beam expanding insulator, the pressure compensator, the oil-filled plug tail clamp, the sealing assembly and the calibration gasket jointly define a completely-closed oil-filled cavity, fluorinated oil or synthetic hydrocarbon oil subjected to degassing treatment is injected into the oil-filled cavity through a valve, and the oil-filled cavity is matched with the pressure compensator to construct an active pressure compensation sealing system. The invention is suitable for the technical field of connectors.

The utility model discloses an entrance and exit personnel wearing intelligent monitoring device based on image acquisition, which comprises a shell, an intelligent camera is fixedly mounted at the top of an inner cavity of the shell, a water tank is fixedly connected to the bottom of the inner cavity of the shell, and a conveying cylinder is fixedly connected to the left end of the top of the water tank. According to the utility model, through the arrangement of the intelligent camera, image acquisition and identification can be carried out on wearing and dressing of an entering person, the safety management level of a construction site is effectively improved, and through the arrangement of the shell and the transparent glass plate, the intelligent camera can be stored and protected; and meanwhile, through the arrangement of a driving motor, a reciprocating screw rod, an L-shaped rotating rod, a movable frame plate, a vertical rod, a piston, a conveying cylinder, a first one-way valve, a water tank, a second one-way valve and a cleaning spray pipe, the purpose of automatically cleaning dust shielded at a lens of the intelligent camera is achieved, and the situation that the definition of a monitoring recognition picture is affected due to dust attachment is effectively avoided.

This invention discloses a municipal pipeline welding support and positioning device and welding method, relating to the field of pipeline welding technology. The municipal pipeline welding support and positioning device includes a traveling module and an expansion module. The expansion module includes a central crossbar, a movable crossplate, a first electromagnetic support block, and a second electromagnetic support block. An inwardly recessed gap is provided between the first and second electromagnetic support blocks. The first electromagnetic support block can move axially along the central crossbar to drive the first and second annular end faces to approach and fit together. The outer ring weld is located in the middle of the inwardly recessed gap, i.e., the first and second electromagnetic support blocks are located on opposite sides of the outer ring weld, which avoids the problem of the outer ring weld sticking to the first / second electromagnetic support blocks during weld penetration. This allows the expansion structure to smoothly detach from the pipeline, and the expansion structure to smoothly contract and travel to the next work node.