56results about How to "Slow down discharge" patented technology

The present invention relates to a rotating fluidized bed apparatus for powder particle. A gas circulation path is formed at the periphery of the treatment chamber 2 via the circumferential faceplate 202, 212, and the circumferential faceplate is adapted to rotate around an axis. Behavior of powder particles can be controlled by introducing gas from the periphery of the treatment chamber via the circumferential plate 212 to exert centripetal force on the powder particle, while exerting centrifugal force on the powder particles accompanying rotation of the circumferential plate 212. In another aspect, by making the arrangement proportion of the bag filter 5 inside the treatment chamber 2 wider than the surface width of the dispersion plate 212 or larger than the surface area of the dispersion plate 212, it is possible to cause gas that has flowed into the treatment chamber 2 to be discharged at a lower rate at an axial region inside the treatment chamber 2 where centrifugal force is weak and discharge rate is fast. It is possible to carry out optimal operation control of introduction and discharge of gas for fluidized bed behavior.

The invention relates to a casting device for applying a foaming reaction mixture, to at least a partial width of a cover layer, wherein the casting device comprises: a supply connection for feeding in the reaction mixture; at least one exit slit extending in a transverse direction for the exiting of the reaction mixture; two slit plates arranged opposite one another, wherein a slit space extends between the slit plates in a vertical direction above the exit slit. A supply channel connected to the supply connection is formed between the slit plates, which closes off the slit space above the exit slit in the vertical direction The supply channel has a channel cross-section, the main dimension of which is larger that the width of the slit space. The reaction mixture can be introduced into the slit space to distribute the reaction mixture over the length of the supply channel.

The invention discloses a food preservation box, and relates to the technical field of food preservation. The food preservation box comprises a box body, a sealing cover and an ice cube groove, wherein a foam thermal insulating layer is fixed to the inner side of the box body; the sealing cover is arranged above the box body; the ice cube groove is formed in the lower part of the box body; a damping layer is fixed below the ice cube groove; hollow cavities are formed in the inner side of the foam thermal insulating layer; exhaust pipes are arranged on the outer sides above the hollow cavities;and a rubber handle is fixed above the sealing cover; the sealing cover is internally provided with dustproof nets, a ventilation pipe is arranged below the dustproof nets, air flow channels are arranged below the ventilation pipe, partition plates are arranged in the box body, soft cotton pads are arranged on the lower side of the inner part of the box body, universal wheels are arranged at thebottom of the box body, and anti-collision bars are fixed to the outer side of the box body. The food preservation box has the beneficial effects that by arranging the hollow cavities, the box body isconveniently refrigerated at low temperature, and the deterioration speed of food is slowed down.

The invention discloses an automatic vacuum packaging mechanism for spicy fish. The automatic vacuum packaging mechanism comprises a bottom plate, supporting seats are arranged on the two sides of thetop of the bottom plate, motors are installed on the outer surfaces of the supporting seats, the output ends of the motors are connected with rotating shafts, rotating rollers are arranged on the outer surfaces of the rotating shafts, the outer surfaces of the rotating rollers are in transmission connection through a conveying belt, a lower groove is fixed to the outer surface of the conveying belt, and a sealing groove is formed in the top of the lower groove. During heat sealing, a vacuum pump pumps waste gas into a purifying box, an activated carbon layer and a silver ion filtering layer primarily filter and purify the waste gas, and an ultraviolet lamp irradiates a photocatalyst layer at the moment, so that the photocatalyst layer generates a catalytic effect, and harmful substances in the waste gas are degraded; and a sound absorption layer can play a role in sound absorption during exhausting, and through blocking of all the purification layers and sound absorption of the soundabsorption layer, the exhausting speed of air is reduced, noise during exhausting is reduced, and the working environment is guaranteed.

The invention relates to the field of plastic molding, and in particular, relates to a plastic foam forming device which mainly comprises an upper hot-pressing plate, a lower hot-pressing plate, a forming mechanism and a cooling device; the cooling device includes an exhaust pipe connected to the upper part of a steam generator, a turbine mechanism connected to the exhaust pipe, a pump body connected to the turbine mechanism, and a hot water tank connected with a pump body; the turbine mechanism comprises a tube body and a turbine, the turbine is rotatingly connected with the tube body througha rotating shaft, and one end of the tube body communicates with the exhaust pipe; the pump body comprises a water inlet, a water outlet and an input shaft; the rotating shaft of the turbine mechanism is fixed with the input shaft; the rotating shaft is internally provided with a diversion channel, one end of the diversion channel communicates with the steam generator, and the other end of the diversion channel communicates with the water inlet of the pump body; the rotating shaft is provided with a plugging block sliding along the radial direction of the rotating shaft; the diversion channelis conducted when the rotating shaft rotates; the water outlet of the pump body communicates with the hot water tank, and a first stop valve is arranged on the exhaust pipe. The device improves the energy utilization rate and accelerates the cooling rate.

The invention relates to a concave-convex nozzle plate (4) having an arrangement of the nozzles (3) on the convex side. Said nozzle plate and an extrusion device (2) equipped therewith is suitable for extruding plastic melts in strand granulation.

The invention discloses a crucible heating and cooling system for manufacturing high borosilicate glass, which comprises a temperature changing module, a power module, a watering module and a sealing module, the temperature changing module comprises a workbench, a solid-bottom cylinder installed on the top of the workbench, an arc-shaped plate fixedly connected with the solid-bottom cylinder, a ring body connected to the outer side of the arc-shaped plate in a sleeving mode, a sleeve plate arranged in the solid-bottom cylinder and an L-shaped ring body connected to the outer side of the ring body and the solid-bottom cylinder in the sleeving mode. According to the invention, after the crucible is mounted on the sleeve plate, a transmission pipe for refrigerating or heating is inserted into a gas inlet pipe, then a motor is started, the motor enables a first bevel gear and a third bevel gear to rotate through a second bevel gear, the rotating directions of the first bevel gear and the third bevel gear are opposite, and in the process, gas entering an annular box body is discharged through a plurality of second through holes; the gas is uniformly blown to the outer surface of the rotating crucible, and the outer surface of the crucible is uniformly heated or cooled, so that the heating or cooling efficiency of the crucible is improved, and the energy consumption is reduced.

The invention discloses a calcinator for calcining active calcium conveniently and relates to the field of metallurgy. By the adoption of the calcinator for calcining the active calcium conveniently, the technical problem that according to a calcinator for calcining active calcium conveniently in the prior art, the energy utilization rate is insufficient is solved. The calcinator for calcining the active calcium conveniently comprises a hearth. The hearth is divided into an upper heating cavity and a lower discharging cavity by a partition board. A communication hole enabling the heating cavity to communicate with the discharging cavity is formed in the partition board. A heating device is connected to the bottom end of the heating cavity. A smoke discharging pipe and a feeding pipe are connected to the top end of the heating cavity. Annular baffles are arranged in the heating cavity. The longitudinal section of each baffle is in a V shape. An opening is formed in the bottom of each baffle. A turbulence plate is arranged above each opening, and the longitudinal section of each turbulence plate is in an inverted V shape. A discharging device is arranged in the discharging cavity. The calcinator for calcining the active calcium conveniently is applied to a metallurgical calcination procedure.

The noise reducing apparatus of reciprocating compressor includes rack assembly set inside the casing, compression system for compressing refrigerant gas and lubricant oil supplying system. The lubricant oil supplying system lubricant oil pump installed below the rack assembly to pump lubricant oil from the casing bottom, the lubricant oil flow path on the rack assembly and connected to the lubricant oil pump to supply lubricant oil to between the cylinder and the piston and to recover lubricant oil to the casing bottom, and gas exhaust structure set on the rack assembly to separate the compressed gas from lubricant oil and exhaust compressed gas outside the compression system. The beneficial effects include simple structure, reliable performance, reduction in bubble noise and impact noise.

The invention discloses an environment-friendly energy-saving waste incineration device which comprises a housing; an incineration separation net is arranged above a slag gathering chamber; a liquid medicine incineration pot is arranged above the incineration separation net; a combustion chamber is formed between the liquid medicine incineration pot and the incineration separation net; a slot is formed in the left side of the combustion chamber; a cover plate is movably connected at the slot; a first exhaust tube is arranged in an inner cavity of the liquid medicine incineration pot in a penetrating manner; the bottom end of the first exhaust tube communicates with the combustion chamber; the top end of the first exhaust tube extends to be located above the liquid medicine incineration pot; a plurality of bumps are arranged above the liquid medicine incineration pot; the bumps are located at the top end of the inner cavity of the housing; a purifying box is connected at the right side of the housing through a second exhaust tube; and an air outlet is formed in the top end of the purifying box. The environment-friendly energy-saving waste incarnation device disclosed by the invention is environmentally friendly, saves energy, and can sufficiently utilize heat and treat waste gas, so that environmental pollution is effectively avoided.

The invention relates to the technical field of air valves and discloses a fast-sucking slow-discharging type air valve with a filtration function. The fast-sucking slow-discharging type air valve with the filtration function comprises an air valve main body and a valve assembly. A valve opening of the air valve main body is connected with the valve assembly. The valve assembly comprises a valve body. A valve body inner cavity is an S-shaped runner, and the valve body is divided into a left cavity and a right cavity. The two ends of the S-shaped runner are correspondingly provided with an airvalve main body connector and a pipeline connector which are not in the same cavity. A filter barrel is further arranged in the cavity provided with the air valve main body connector. The fast-suckingslow-discharging type air valve is suitable for being arranged in a pipeline provided with a service valve, a filter does not need to be arranged for the air valve independently, all original functions of the air valve are achieved, the air valve is provided with a filter, the runner in the valve assembly is in an S shape, resistance to water is large, resistance to air is small, air dischargingis facilitated, water draining is not facilitated, the ejection phenomenon of gas-liquid two-phase flow at the closing moment of the air valve can be reduced or avoided, and fast sucking and slow discharging functions of the air valve are enhanced.

The invention belongs to the field of building parts, and particularly relates to a windproof safety self-reinforcing door. The windproof safety self-reinforcing door comprises a door frame and a door body; the door frame is fixedly installed in a wall; the door body is hinged to the door frame through hinges; a self-reinforcing part is further installed between the door frame and the door body; the self-reinforcing part comprises an arc-shaped cavity formed in the door frame; a one-way air inlet communicated with the outside is formed in the side wall of the arc-shaped cavity; a vertically-arranged supporting shaft is rotationally connected into the arc-shaped cavity; the door body is fixedly connected with the side wall of the supporting shaft; a sealing plate is fixedly installed on the side wall of the supporting shaft, and the sealing plate is in sealed sliding connection with the side wall of the arc-shaped cavity; and an exhaust cavity communicated with the outside is formed in the door body, and one end of the exhaust cavity communicates with the arc-shaped cavity through an air guide pipe. Air in the air guide pipe can be prevented from flowing into the exhaust cavity through a blocking ball, so that the exhaust speed of the air in the arc-shaped cavity is greatly reduced, and the door body cannot be driven by airflow to strike the door frame suddenly to cause damage.

The invention relates to the technical field of air valves, and discloses an air valve unit with functions of maintenance, filtering and reverse cleaning. The air valve unit with the functions of maintenance, filtering and reverse cleaning comprises an air valve, a filter, a first on-off mechanism, a second on-off mechanism, and T-shaped pipes. Both ends of each T-shaped pipe are a pipe connectionopening and an impurity sewage outlet respectively. The air valve is connected with the upper ends of the T-shaped pipes. The filter is a double-layer filter cartridge. The filter cartridge is fixedat the lower end of the air valve, and the length of the filter cartridge covers a valve opening of the air valve. The ports of the filter cartridge used for receiving impurities corresponds to the pipe connection opening and the impurity sewage outlet respectively, and port diameter is larger than diameter of the T-shaped pipe. The first on-off mechanism is arranged on the T-shaped pipe between the filter cartridge and the pipe connection opening. The second on-off mechanism is arranged on the T-shaped pipe between the filter cartridge and the impurity sewage outlet.

The invention discloses a sole with a buffer structure. The sole is made of macromolecular elastic material; middle bottom supporting structures are arranged on the upper surface of the outer bottom facing the middle bottom; the middle bottom supporting structures are arranged in subareas along the longitudinal length direction of the shoe; the middle bottom supporting structure in each subarea is a netlike grid with a connecting wall; and the upper part of the connecting wall of the netlike grid of the middle bottom supporting structure in at least one subarea is thicker than the lower part,so that a buffer structure is formed, and the cavity partitioned and encircled by the netlike grids is a prismatic table-shaped cavity, the opening area of the upper part of which is smaller than thehorizontal section area of the lower part. After non-uniform load borne by the outer bottom can be fully and uniformly dispersed by using good elasticity and relatively low rigidity generated after the netlike grids and the macromolecular elastic material are combined, the load is transferred to the middle bottom; and impact subjected by the sole can be effectively lightened.

The invention relates to the field of hydraulic cylinders, and discloses a hydraulic cylinder having a buffering function. The hydraulic cylinder comprises a cylinder body, a cylinder barrel and a piston, wherein the cylinder body is provided with an A port and a B port, the cylinder barrel is provided with a first through hole and a second through hole, and the A port, B port, first through holeand second through hole are located inside the cylinder body and can make reciprocating motion relative to the cylinder body; the piston is located inside the cylinder barrel to divide the interior ofthe cylinder barrel into a first control cavity and a second control cavity; the first control cavity communicates the A port through the first through hole, the second control cavity communicates the B port through the second through hole, the piston makes reciprocating motion relative to the cylinder body under the pressure of a medium between the first control cavity and the second control cavity, and the cylinder barrel moves relative to the cylinder body when the piston moves to the terminal position of any one control cavity, so that the flow area between the through hole communicatingthe control cavity and the A port or B port is reduced, so as to reduce the discharge velocity of the medium in the control cavity. The hydraulic cylinder provided by the invention can not only realize the effective deceleration buffer of reciprocating motion process of the piston, but also is simple in structure and easy to process and manufacture.

The invention belongs to the technical field of photovoltaic charging piles, and particularly relates to photovoltaic charging pile safety equipment. The device comprises a photovoltaic panel, a charging console and a storage battery. When the storage battery explodes, the impact on the two sealing protrusions can be increased, and the slidable sealing protrusion moves upwards to be flush with the other sealing protrusion to seal the inner hole of the heat dissipation pipe. Therefore, the explosive shock waves can only flow out along the shock wave release channel, when the shock waves flow to the outlet of the shock wave release channel, the shock waves impact the impact swing plate installed at the outlet of the shock wave release channel, the exhaust cover is opened through the impact swing plate, and the square opening in the installation plate is completely opened. Thus, the shock waves of explosion are discharged from the square opening of the installation plate along the shock wave release channel, the situation that explosion is further expanded due to the fact that the shock waves of the explosion cannot be discharged in time is prevented, and other internal equipment cannot be damaged.

The invention discloses a mute type oxygen generator. The mute type oxygen generator comprises an exhaust pipe, wherein the exhaust pipe is connected to a noise reduction device which divides the exhaust process into continuous single exhaust and performs pressure reduction to reduce noise; an outer mute shell is arranged on the noise reduction device; and an air outlet is formed in one end of theouter mute shell. According to the mute type oxygen generator, the noise reduction device is arranged at the end of the exhaust pipe of a compressor, and continuously divides high-pressure air into independent small-flow air through continuous connection of kidney-shaped holes in a first air distribution pipe and air passing holes in a second air distribution pipe, and the air is compressed alongwith a first spring, so that the pressure intensity is reduced, the exhaust speed is reduced, and the noise is reduced; a sliding block cannot reset in the exhaust process due to the existence of a driving mechanism; the gas in a cavity is effectively exhausted and then the sliding block resets; and the noise is reduced through a sound absorption material, the kinetic energy of the impacted gas is reduced, the exhaust speed is reduced, and therefore the generated noise is reduced.

The invention provides a PNCR denitration optimization system based on big data. The optimization system comprises a detection device, a sensing device, a control device, an early warning device, a sampling device, an adjusting device and a processor, the detection device is configured to detect reducing agent parameters in a reaction chamber; the sensing device is configured to sense a reducing agent; the control device is configured to control the triggering time of the reducing agent; the early warning device is configured to carry out early warning on parameters in the reaction cavity, and carry out early warning operation in cooperation with data response of the detection device and the sensing device; the sampling device is configured to collect the reaction effect of the reaction cavity; and the adjusting device is configured to adjust the mixing condition of the reducing agent. Oxygen is driven in a contact cavity, so that the exhaust speed is reduced in the constant output process of waste gas in a container, the contact between the reducing agent and the waste gas is further enhanced, and it is guaranteed that the treatment efficiency of the waste gas is improved.

The printing element (1) has a radiation or spraying device (9) that is provided for a cleaning liquid. The radiation or spraying device is provided with housing (10). A base (13) is relatively inclined to the horizontal outer surface (14). The radiation or spraying device is directed away from the ink application roller (5). The radiation or spraying device is directed to one of the dampening rollers (7,8).

The invention discloses a driving loop of a pneumatic cushion valve, which comprises a stamping air cylinder and an air storage tank, one end of the air storage tank is connected with the stamping air cylinder and is used for buffering the air pressure change of the stamping air cylinder, the other end of the air storage tank is connected with a regulating valve and a pressure reducing valve which are connected in series, and the pneumatic cushion valve is arranged between the air storage tank and the regulating valve. The pneumatic buffer valve is used for exhausting and depressurizing the air storage tank, and when the air storage tank depressurizes, the pneumatic buffer valve is used for supplementing air and pressurizing the air storage tank. According to the buffer valve, the size of the air storage tank does not need to be enlarged, the problem that the pressure fluctuation of the air storage tank is large when a punching machine is started and used can be solved, internal heat production of the buffer valve is reduced, it is guaranteed that the size of the buffer valve is small, and meanwhile continuous change of the state of the adjusting valve can be avoided; the driving loop of the pneumatic cushion valve can enable the cushion valve to achieve a good buffering effect.

The invention relates to the technical field of IDC operation and maintenance management, in particular to defense equipment for solving DDOS attacks and a using method thereof. The equipment comprises an equipment chassis, a connecting frame, a defense equipment body and a motor; the top end of the equipment chassis is fixedly connected with the connecting frame, the top end of the connecting frame is fixedly connected with the defense equipment body, a maintenance window is fixedly installed on the surface of the defense equipment body, and a rectangular supporting frame is fixedly installedat the top end of the defense equipment body. According to the invention, the defense equipment body is arranged; the defense equipment body is internally configured with a plurality of IP addresses(load balancing). Each node can bear a DDOS attack which is not lower than G; if one node is attacked and cannot provide service, the system can automatically switch to the other node according to priority setting, and returns all data packets of an attacker to a sending point, so that an attack source is in a paralyzed state, and a security execution decision of an enterprise is influenced from adeeper security protection perspective.

The invention discloses a pressure reduction silencer. The pressure reduction silencer comprises a shell, an air inlet, an air outlet and a device door; a lantern ring is arranged on the outer side ofthe shell in a sleeving mode; a connecting rod is fixed at the bottom of the lantern ring; the air inlet is fixed at the upper corner of the shell; a slow flow box is internally provided with a connecting shaft; a fixed plate is fixed on the side of the connecting shaft; a partition plate is arranged below the connecting shaft; the bottom of the slow flow box is connected with one end of a silencing tube; a connecting tube is arranged on the side of the silencing tube; the air outlet is fixed at the lower corner of the shell; a first silencing layer is adhered to the inner wall of the shell;a second silencing layer is arranged on the side of the first silencing layer; and a third silencing layer is applied on the outer wall of the shell. According to the pressure reduction silencer, a mounting mode of the silencer can be changed according to mounting requirements, and the noise reduction amount of the silencer can be improved through a plurality of different silencing materials, so that the noise can be prevented from being transmitted to outside before being removed completely in a device.

The invention provides a resonant cavity of an air compressor of an engine. The resonant cavity is of a box structure. The capacity of the resonant cavity is at least 5 times as large as the gas displacement of the air compressor. The air intake side of the resonant cavity is provided with an air inlet communicating with an air intake pipe of the air compressor. The exhaust side of the resonant cavity is provided with an exhaust port communicating with an air suction port of the air compressor. The air inlet is close to the top face of the resonant cavity. The exhaust port is close to the bottom face of the resonant cavity. A partition plate is arranged inside the resonant cavity. The bottom end of the partition plate is fixedly connected with the bottom face. A gap is reserved between the top end of the partition plate and the top face. A first included angle is formed between the partition plate and the bottom face and is smaller than or equal to 90 degrees. The resonant cavity of the air compressor of the engine can prevent that too much oil is pumped into a cylinder of the air compressor and can also significantly lower noise.

The invention belongs to the technical field of artificial leather manufacturing, and particularly relates to a method for manufacturing hydrolysis-resistant garment leather. A squeezer adopted by themethod comprises a rack, wherein a driven roller is rotatably connected to the rack; a sliding chute No. 1 is formed in the rack in one side of the horizontal direction of the driven roller; a driving roller is rotatably connected inside the sliding chute No. 1; a belt pulley is fixedly connected to the end, extending to the outer side of the rack, a rotating shaft of the driving roller; a sliding sleeve is arranged on the rotating shaft of one side, far away from the driving roller, of the belt pulley in a sleeving manner; the sliding sleeve is rotatably connected to the rotating shaft of the driving roller; an oil cylinder is articulated with a position, corresponding to the sliding sleeve, of the rack; a piston rod of the oil cylinder is fixedly connected to a sliding barrel; a guide roller No. 1 is rotatably connected to the top of a support; and the rack below the driven roller is rotatably connected to a guide roller No. 2 through a support No.1. The drainage efficiency of textile fabrics is improved by enabling the textile fabrics to vertically and upwards pass the driving roller and the driven roller, and thus, the efficiency of the textile fabric squeezing is improved.

The invention discloses a filtering device and an oil fume purifier, and relates to the field of catering. The filtering device comprises a separation mechanism and an air outlet pipe, the separation mechanism comprises an inlet and an outlet, lampblack entering from the inlet is separated by the separation mechanism to form pretreated gas, the pretreated gas is discharged from the outlet, the air outlet pipe is connected with the separation mechanism, and a first channel communicated with the outlet is formed in the air outlet pipe. The cross sectional area of the first channel is gradually increased in the discharge direction of the pretreated gas, and the first channel of the structure can reduce the flow speed of the discharged pretreated gas so as to ensure the good purification effect of the whole oil smoke purifier. The oil fume purifier can achieve a good purification effect on oil fume by applying the filtering device.

The invention discloses a finished product separator of molten alkali, relating to the industrial technical field of caustic soda or sodium hydroxide. A structural design that a guide component is arranged below a falling film tube interface is adopted, the guide component can directly guide the molten alkali, which flows out of the falling film tube interface, into an alkali discharge hole, and then the molten alkali can stably flows to the alkali discharge hole; meanwhile, a base plate is arranged below the guide component, then alkali steam, which is ejected from the falling film tube interface, is prevented from directly scouring downwards, so that erosion corrosion to a first barrel is effectively reduced through the combination of the guide component and the base plate, the service life cycle of the first barrel is prolonged, and production and maintenance costs are lowered. Meanwhile, a second barrel and the falling film tube interface are respectively distributed towards two ends of the axial direction of the first barrel, so that the retention time of alkali steam in the internal cavities of the first barrel and the second barrel is effectively increased, the discharge velocity of the alkali steam is reduced, and the finished product separator of the of molten alkali has the characteristics of simple structure, reasonable layout, safety, reliability and sufficient separation.

The invention discloses a diesel engine tail gas particulate matter water film adsorption purification device and method. According to the device, a water tank is fixedly connected to an opening in the upper end of a box body, a gas outlet pipeline and a gas inlet pipeline are fixedly connected to the middle of a left side plate and the middle of a right side plate of the box body, and a liquid drainage pipeline is fixedly connected to the bottom of the box body; an adsorption unit is arranged in the box body and consists of a plurality of adsorption mechanisms which are arranged side by side; each adsorption mechanism is composed of three corrugated plates arranged side by side, the three corrugated plates form two corrugated containing grooves, and a plurality of water seepage holes are formed in plate bodies of the two corrugated plates located on the two sides; and corrugated communicating holes are formed in the portions, corresponding to the corrugated containing grooves, of a water tank bottom plate. The method is characterized in that a curved-surface-shaped water film formed on the surfaces of the adsorption mechanisms collides with flowing tail gas for multiple times, so that solid particles in the tail gas are adsorbed by the water film in the collision process and sink to the bottom of the box body under the action of self weight. According to the device and the method, particulate matters in the waste gas can be effectively captured, and the influence of the waste gas on the environment can be effectively reduced.

The invention relates to the technical field of air valves, and discloses a quick-suction and slow-discharge air valve with maintenance and filtration. The quick-suction and slow-discharge air valve with maintenance and filtration comprises an air valve main body and a valve module; a valve opening of the air valve main body is connected with the valve module; the valve module comprises a valve body and a valve body connection and disconnection mechanism; an inner cavity of the valve body is an S-shaped runner; an air valve main body connecting port and a pipe connecting port are respectivelyarranged at the two ends of the S-shaped runner; the valve body connection and disconnection mechanism divides the S-shaped runner into left and right cavities for cutting off or communicating flows between the air valve main body connecting port and the pipe connecting port; a filter cylinder is arranged in the cavity with the air valve main body connecting port; and the filter cylinder is of a double-layer structure, and comprises an outer filter screen, an inner filter screen and a support plate. The quick-suction and slow-discharge air valve with maintenance and filtration has no need to be singly provided with a maintenance valve and a filter on an air valve, and has all functions of the air valve.