2777results about How to "Play a sealing role" patented technology

The invention discloses an electric pressure cooker vapor exhausting device which structurally comprises an electric pressure cooker, a pot cover, a water collecting tank, an exhausting device and a control panel. The control panel is arranged at the front portion of the electric pressure cooker. A power line is arranged at the rear portion of the electric pressure cooker. The left side of the electric pressure cooker is connected with the water collecting tank through a buckle. A silica gel seal ring is arranged on the top of the electric pressure cooker by a circle. The pot cover is arrangedon the top of the electric pressure cooker. The right portion of the pot cover is in threaded connection with a fixed base. A handle is arranged on the top of the fixed base. The left portion of thehandle is connected with the exhausting device. The water collecting tank is composed of a liquid level sensor, an alarm device, a concave hole and a natural rubber seal ring. The exhausting device comprises a fixed column, a synthesized rubber seal ring, a telescopic elastic head, a vapor inlet, a vapor guide pipe, a liquefied device and an exhaust pipe. The electric pressure cooker vapor exhausting device is convenient to install and detach, high in sealing performance and high in intelligence and efficiently senses the vapor liquid level.

The invention discloses an intermittent feeding device. The intermittent feeding device comprises a rack, a pushing device and a feeding device; the feeding device comprises a hopper, the hopper is fixedly installed on the rack, a discharge opening is formed in the side wall of the bottom portion of the hopper, and a bottom plate is installed at the bottom of the hopper; the pushing device comprises a pushing block, and the pushing block is connected with the bottom plate in a sliding mode; the pushing device further comprises a gas bag, an output tube, a squeezing plate and a pushing plate; the gas bag and the squeezing plate are fixedly installed on the rack; the top of the gas bag abuts against the squeezing plate; the pushing plate is connected with the rack under the gas bag in a vertical sliding mode; the output tube is installed between the gas bag and the hopper; an exit of the gas bag communicates with the output pipe; a piston sliding horizontally is connected in the output pipe; the piston is fixedly connected with the pushing block; a fixing plate is connected with the portion, located between the piston and the pushing block, of the output pipe wall; and an elastic part is connected between the piston and the fixing plate. Compared with the prior art, the intermittent feeding device has the advantage that thrust of the pushing block to materials is quiet soft in the material pushing process, so that damage to the materials caused by instantaneous crashing force of the pushing plate is avoided.

The invention relates to industrial manufacturing equipment, in particular to automated assembly equipment for combining sealing rings. The invention provides compliance assembly equipment for O-shaped sealing rings. The compliance assembly equipment for the O-shaped sealing rings comprises a base, a feeding mechanism, a mechanical arm and a gripper mechanism, wherein the feeding mechanism is used for providing the O-shaped sealing rings; the mechanical arm is used for driving the gripper mechanism to move; the gripper mechanism is used for grabbing the O-shaped sealing rings; the feeding mechanism, the mechanical arm and a workpiece are fixedly connected to the base; a feeding track of a vibrating plate is connected to the feeding mechanism; the gripper mechanism is fixedly connected to the mechanical arm; and the feeding mechanism and the workpiece are positioned on the lower part of the gripper mechanism. By the compliance assembly equipment for the O-shaped sealing rings, the O-shaped sealing rings can be assembled and manufactured in an unmanned manner, efficiency is high, and quality is good. According to the compliance assembly equipment for the O-shaped sealing rings, the O-shaped sealing rings are automatically supplied by the vibrating plate, and then the mechanical arm grabs the O-shaped sealing rings to assemble the O-shaped sealing rings into the workpiece.

The invention relates to a biomass feed divider with changeable trough obliquity and vibration frequency and amplitude, which realizes continuous, stable and safe feed division by adopting two regulating measures of changing obliquity of a trough and changing vibration frequency and amplitude and by exciting force generated by a vibrating motor (9). The device is formed by arranging one or a plurality of independent distributors in parallel, wherein each distributor mainly comprises a trough body (4), a vibrating motor (9), an elevating (8), a spring supporting mechanism (11) and an auxiliary mechanism; the trough body (4) is supported by the spring supporting mechanism (11) at the front part and the elevating (8) at the rear part, the vibrating motor (9) is arranged in the middle of the bottom of the trough body (4), and the rear part of the trough body (4) is connected with bulkhead by canvas (3). The device integrates material storage and material distribution, is not only suitable for hard biomass but also is suitable for soft biomass, and has lateral expansibility, thereby being convenient to be used together with material equipment of various types.

The invention discloses a metal laser selective melting forming double-piston controllable preheating powder cylinder capable of respectively working in two states of single piston and double pistons. When the powder cylinder works in the state of single piston, firstly, a large piston basal plate in a forming cylinder is leveled; and then, the periphery of a cylinder body is heated by using a cylinder body heating ring, and a piston heating plate is used for heating a piston cover plate to realize indirect heating of a forming cylinder and metal powder in a powder feeding cylinder. When the powder cylinder works in the state of double pistons, firstly, a small piston basal plate is leveled; and then, powder in a small piston forming cylinder and a small piston powder feeding cylinder is uniformly heated by using the cylinder body heating ring and the piston heating plate. The powder cylinder adopts an integrated double-piston design; a small piston can be replaced and disassembled to realize the laser forming of metal components with different sizes; powder is saved; and meanwhile, the powder cylinder can be heated in all directions, so that the controllable powder preheating is realized, the powder heating is uniform, the temperature gradient is improved, and the deformation and the split of the components are reduced.

The invention discloses a bag making machine. According to the technical scheme, the bag making machine is mainly characterized by comprising a rack, the rack is provided with a feeding device for feeding plastic film rolls and a heat-sealing device, the heat-sealing device comprises heat-sealing knives, the two heat-sealing knives are parallel to each other, and a cutting device for cutting a plastic film is arranged at the position, located at the downstream of the heat-sealing device, of the rack; the bag making machine is provided with the two heat-sealing knives and the cutting device, and the heat-sealing knives only play a role in sealing the plastic film instead of cutting the plastic film, so that after heat-sealing of the plastic film is completed, a pair of parallel heat-sealing strips are formed on the plastic film, then the plastic film is sent into the cutting device, the cut position of the cutting device is located between the two heat-sealing strips, thereby the structures of the heat-sealing strips cannot be damaged, sealing performance of a plastic film bag cannot be influenced, the plastic film is not separated through heat cutting, stringing cannot be generated, and product quality and hand feeling of users in the later-stage using process are improved.

The invention discloses a photonic crystal optical fiber methane sensing device based on modular interference. The device is composed of a broadband light source, an optical circulator, a photonic crystal optical fiber methane sensor cladding an air hole coated polymer sensitive film, a testing air chamber, a switching valve, a quality flow controller, a spectrum analyzer and a computer, wherein the optical fiber methane sensor consists of a single mode fiber, a photonic crystal optical fiber and a welding area of the two fibers; the adopted photonic crystal optical fiber refers to an endless single mode solid core photonic crystal optical fiber; the polymer sensitive film refers to a polycarbonate resin methane sensitive film containing a cage molecule E-(OC2H5)6, and the inner wall of the cladding air hole of the photonic crystal optical fiber is coated with the film by virtue of an air pressure driving device; when the to-be-tested methane gas acts with the sensitive film on the inner wall of the cladding air hole of the photonic crystal optical fiber, the refractive index of the sensitive film changes, the reflection interference spectrum characteristic wavelength of the sensor is moved, the average movement amount shown in the description of the reflection interference spectrum characteristic wavelength before and after contacting the sensor with the methane gas is analyzed, so that the concentration of the to-be-tested methane gas can be obtained. The device disclosed by the invention has the characteristics of high sensitivity, high stability, high selectivity and the like.

The invention relates to a gas purifying device, which is a vertical drum-type equipment, on the top thereof are arrange a gas collection chamber and a gas outlet, and a liquid collection chamber and a liquid outlet are arranged on the bottom of the gas purifying device, a main chamber is provided between the gas collection chamber and the liquid collection chamber, on the upper part of the main chamber is arranged a mist eliminator, a gas tangential inlet is arranged on the lower part of the main chamber near to the liquid chamber, and an absorption liquid inlet is provided below the mist eliminator. In the main chamber, a group of fluid directors are coaxially arranged in a certain space. The leakage between the fluid directors and the tower inner wall can be reduced maximally via the outer rings on the fluid directors. After the gas to be treated enters the tower via the gas inlet, it rotates and runs up simultaneously. The absorption liquid injected via the liquid inlet has a contact with the rising rotary gas flow, and the absorption liquid can form liquid film, liquid silk, and liquid drop to under turbulent shearing action of swirling flow field, which makes gas and liquid have a sufficient contact; and because of the fast gas-liquid relative velocity and great turbulent degree, the invention is provided with high gas-liquid mass transfer rate and good absorption effect.

The invention discloses a full-automatic electric cooker which comprises a rice washing device and an electric cooker body. The rice washing device comprises a stirrer, a cylindrical rice washing bin and a first lifting mechanism which controls the rice washing bin to move up and down, a water adding pipe and a rice feeding pipe are arranged on the rice washing bin, a rice discharging opening is formed in the bottom of the rice washing bin, and a water draining pipe is arranged at the position of the rice discharging opening. A cooker cover is arranged at the top of the electric cooker body, a rice adding opening is formed in the cooker cover, the first lifting mechanism controls the rice washing bin to descend so as to enable the rice discharging opening in the rice washing bin to penetrate through the rice adding opening to be inserted in the bottom of the inner side of the electric cooker body, and a rice washing cavity is jointly formed by the inner side wall of the rice washing bin and the bottom of the inner side of the electric cooker body. According to the full-automatic electric cooker, the complex rice discharging structure is arranged on the rice washing device, a cover is not required to be added on the rice discharging opening at the bottom of the rice washing bin for special sealing, a mechanism for controlling the cover to be opened and closed is removed, therefore, the manufacturing cost is reduced, and meanwhile the effect that rice is discharged more thoroughly is further achieved.

The invention discloses double-piston metal laser selective melting molding equipment. The double-piston metal laser selective melting molding equipment comprises a main machine body, an auxiliary machine body, a powder cylinder, a scraper motion component and a light path system. The equipment can work in a single-piston state and a double-piston state. Integrated double-piston design is adopted, the equipment can work independently in the single-piston state and the double-piston state, a small piston can be replaced and dismounted to achieve laser molding of metal components of different sizes, and powder is saved; meanwhile, omnibearing heating can be carried out on the powder cylinder, and the powder is controllably preheated, so that the powder is evenly heated, temperature gradient is improved, and component deformation and cracking are relieved.

The invention discloses a kind of telluric effluvium collection drilling tool which is manual and the sealing effect of soil doesn't destroy when the tool is reversed. The drill bit is taper structure and there is screw thread accreted out of it. The width of the screw thread is wider and wider from the needle to the trail. There is a small hole for collecting gas on the trail part's flank of the drill bit and filter screen and spider filter protector are set out of the hole. The drill bit and closing cap spiral groupware adopt abutting joint screw fastness technique. And the there is also screw thread accreted out of the closing cap spiral groupware.

The invention relates to a creeping ground drilling robot which comprises an electric push rod mechanism, a motor steering mechanism and a drill bit mechanism which are sequentially connected. The outer wall of the electric push rod mechanism and the outer wall of the drill bit mechanism are each provided with a scale device capable of expanding and retracting, the electric push rod mechanism stretches and retracts periodically, each scale device expands or retracts under the action of soil body force and is used for providing supporting counterforce in the drilling direction, the motor steering mechanism adjusts steering of the drill bit mechanism, and a good platform is provided for the task that the robot is provided with a sensor to go deep into soil for geological prospecting, mine disaster search and rescue or soil sample collection in the future. Compared with the prior art, the robot has the advantages of being simple in structure, low in manufacturing cost, convenient to control and the like.

The invention discloses an observation method for a mine rock body drill hole plugging and gas extracting integrated system. According to the observation method for the mine rock body drill hole plugging and gas extracting integrated system, the problems that in the prior art, the sealing effect of a mine rock body drill hole is poor, the extraction cost is high, and gas is difficult to collect are solved, and the effects that the stability of the plugging process and the gas extracting process is improved, and the sealing performance is enhanced are achieved. According to the technical schemeof the observation method, the observation method comprises the following steps that the gas extracting drill hole is drilled; a test probe is mounted and connected with a drill rod, and the test probe is pushed in a squeezed mode to a designated extracting area through a drill rig; the drill hole is sealed; a pressure-tight test is conducted; gas parameters are measured; and a measuring system is connected, a third switch is turned on, gas enters a collection tube and enters the measuring system through a communicating pipe, and after a gas pressure gauge is stable, the showing number on thegas pressure gauge is read and compared with a reading of an electronic pressure gauge.

This invention relates to micro aviator low speed air speedometer, which comprises orderly micro air speedometer, micro voltage difference measurement unit, data collection module, microprocessor and display and memory unit, wherein, the air speedometer has the micro design comprising tube head, outer tube, bus voltage tube and static tube. The outer tube is located with static hole and the bus voltage tube is inserted with tube head and the other end of the outer tube is sealed. The bus and static voltage are separately conducted by bus tube and static tube. The data collection module is connected to the output end of signal adjusting circuit of micro voltage difference. The data collection module is A / D converter circuit module to convert the received signals put to the microprocessor, wherein the microprocessor is connected to the display memory unit.

The invention relates to a segmental hydraulic fracturing coal seam pressure releasing device. A high pressure hydraulic pump station is connected to a segmental hydraulic fracturing hole packer through a high pressure hose and a steel push rod; and after the hole packer is fed into a fracturing hole by the push rod, water flows from the high pressure hydraulic pump station to the segmental hydraulic fracturing hole packer through the high pressure hose, flows through a pressure reducing mechanism and is injected into coal for hydraulic fracturing. Water flow also makes hole packing capsules on two sides of a water outlet swell to achieve a sealing effect, and a fracturing range is controlled between the two capsules. Due to the action of the pressure reducing mechanism, the pressure of the hole packing capsules is always greater than that of the water outlet to realize self sealing. During field implementation, a seam hole can be divided into a plurality of segments and is subjected to fracturing segment by segment; meanwhile, a control hole parallel to the fracturing hole is constructed to increase a free face and can drain, bring out coal dust and achieve a hydraulic loosening effect, and the coal between the hydraulic fracturing hole and the control hole is penetrated through pressure finally, so that the coal seam releases pressure fully, the pre-extraction time of the coal seam is shortened and the extraction rate is improved.

The invention relates to an axial pre-tightening force sensor. The axial pre-tightening force sensor comprises a regulating gasket 2, a left end cover 3, an elastic sensitive element 4, a strain gage 5, a right end cover 6, a thrust ball bearing 7, an axial hole groove 9, a right bolt 10, a fairlead 11, a package shell 12 and a left bolt 13. The regulating gasket is used for regulating the axial position of the sensor on a shaft, the left end cover and the right end cover support the elastic sensitive element through bosses, the elastic sensitive element generates axial strain because of bearing axial force, and the axial force can be measured through the resistance strain effect and a measuring circuit. The axial hole groove 9 in the right end cover 6 of the sensor is matched with the right bolt 10 to be used for preventing the elastic sensitive element from generating circumferential strain in a pre-tightening process, axial displacement of the right end cover 6 and axial strain of the elastic sensitive element 4 are allowed, and the thrust ball bearing is used for insulating circumferential twisting force generated when the pre-tightening force is exerted so that the axial twisting force can be prevented from being transmitted to the elastic sensitive element 4.

This invention relates to a proton exchange membrane fuel cell plate, specifically, a manufacturing method of the flexible graphite material both-side trench plate used for fuel cell, 1) place the expanded graphite plate into dipping tank, vacuum impregnation, joining epoxy resin solution, the weight of the plate increased by 15-50%; drying the dipped plate in the 80~100degreeC; 2) once again place the epoxy resin drying plate into the dipping tank, vacuumed impregnation, then joining phenolic resin solution, the weight of the plate increased by 10-30%, drying the dipped plate in the 80~100degreeC; 3) then repress the drying plate with the plate repression machine, and place the repressed graphite plate on the both-side trench metal mold, pressing to form the shape, the pole plate of both surface having trench; 4) the formed plate processing ascending temperature and heat treatment to solid the resin. The advantages of the invention are: the pole plate having good plastic before molding, and material having good fluidity, and easy to mold for double-sided trench fuel cell pole plate.

The invention provides an anti-blocking floor drain for a bathroom. The anti-blocking floor drain comprises a floor drain frame body which is used for connecting a bathroom water discharging pipeline and bathroom ground; a floor drain core body for discharging water is erected at the lower side in the floor drain frame body, and a round cover is erected at the upper side of the floor drain frame body; the anti-blocking floor drain further comprises a hydroelectric generator which is arranged in a water inlet pipeline of the bathroom; a tool rest is embedded into the upper side of the floor drain core body; the tool rest is provided with a cutting mechanism capable of cutting hairs; the cutting mechanism comprises a mini-type direct current motor and a rotary blade; and a current input end of the mini-type direct current motor is electrically connected with the hydroelectric generator, and an output shaft of the mini-type direct current motor is in transmission connection with the rotary blade. As the cutting mechanism and the hydroelectric generator are arranged, when a user utilizes water, the hydroelectric generator can generate electric energy under the action of hydraulic power, and the electric energy is transmitted to the mini-type direct current motor, so that the rotary blade is controlled to rotate and the hairs are cut off, and furthermore, the hairs can smoothly flow out from the water discharging pipeline; and the electric energy can be saved, and the blocking of the water discharging pipeline can also be effectively avoided.

The invention relates to a gas and oil separating plant for an internal combustion engine, which comprises a separating plant shell, an end cover used for sealing the separating plant shell and a filter screen arranged in the separating plant shell; the separating plant shell is provided with an air inlet in the middle part, and the end cover is provided with an air outlet; the separating plant shell and the end cover form a closed cavity which is divided into a first separating chamber arranged at the lower part and a separating chamber arranged at the upper part by a baffle plate which is arranged in the middle of the separating plant shell; the separating chamber arranged at the upper part is divided into two ring-shaped separating chambers by the filter screen, the separating chamber at the outer side is the second separating chamber, and the separating chamber at the inner side is the third separating chamber; the air inlet is tangentially arranged on the side wall of the first separating chamber; the air outlet is arranged on the top of the third separating chamber; a relief valve which can be opened automatically is arranged between the first separating chamber and the third separating chamber; and a pressure control valve which is used for regulating the air pressure in the third separating chamber is arranged at the air outlet which is arranged on the top of the third separating chamber.

The invention discloses a monitoring camera with an automatic telescopic device, and relates to the technical field of image collection. The monitoring camera disclosed by the invention comprises a camera body and a mounting bracket, wherein the mounting bracket is a mounting bracket that has an L-shaped cross section, the mounting bracket comprises a horizontal supporting plate and a longitudinal supporting plate, which are integrally formed, a solar panel is hinged on the upper surface of the horizontal supporting plate, the longitudinal supporting plate is provided with an energy storage device, the solar panel is connected with the energy storage device, a chute is formed on the horizontal supporting plate, a camera fixing device is clamped in the chute, a telescopic cylinder connected with one side of the camera fixing device is horizontally arranged on the longitudinal supporting plate, the telescopic cylinder drives the camera fixing device to move back and forth along the chute, and the camera body is hinged on the other end of the camera fixing device. The monitoring camera disclosed by the invention has the advantages of having a simple structure, fully utilizing data and being convenient to adjust the shooting distance and the shooting angle.

The invention discloses an integrated tile active phased-array antenna. The antenna comprises an array antenna layer, a heat dissipation cavity, a radio frequency layer, a transition layer, a power supply and control layer and a cover plate layer. A plurality of first slots are formed in one side, close to the transition layer, of the radio frequency layer, first radio frequency chips are arrangedin the first slots, a plurality of second slots are formed in one side, close to the transition layer, of the power supply and control layer, and second radio frequency chips are arranged therein; acontrol device is arranged on one side, close to the cover plate layer, of the power supply and control layer and used for power supply and signal control; the transition layer plays a role in radio frequency signal transition and radio frequency isolation; the array antenna layer is electrically connected with the radio frequency layer at high frequency through a first radio frequency connectionstructure arranged on the heat dissipation cavity; the radio frequency layer is electrically connected with the power supply and the control layer at high frequency through a second radio frequency connection structure arranged on the transition layer; the cover plate layer is electrically connected with the power supply and control layer. According to the antenna, the multi-channel, multi-polarization or multi-frequency multifunctional high-integration integrated design is achieved, the overall size is small, the weight is light, and the thickness is small.

The invention discloses a non-coal-pillar mining method for roof caving roadway forming along a goaf by crushing an immediate roof. The non-coal-pillar mining method comprises the following steps thatwhen a mining roadway of a first coal mining working face is driven, and the top of the mining roadway is subjected to ceiling support while driving is conducted; and then a roof cutting anchor cableis constructed along the coal wall of the first coal mining working face, and an I-shaped steel beam is mounted on the anchor cable, so that the immediate roof after being stoped out breaks off and falls down along the roof cutting I-shaped steel beam into a loose wall formed by naturally stacking caved broken stone so as to finally support an upper roof, thus the upper roof still keeps the action of a rock beam, the roadway after coal mining is conducted is directly top-hung to be hung on the rock beam and is not caved, and a remained gateway along the goaf is formed. According to the non-coal-pillar mining method, by utilizing the mine ground pressure and the characteristics of low strength and weak completeness of the immediate roof, after the working face is pushed, an immediate roofrock layer is caved and accumulated at the edge of the goaf to form a pack wall and a closed goaf, an artificial roadway side is not needed, the technology is simple, and thus the non-coal-pillar mining technique is easy to popularize.

The invention relates to a pressure-compensated rotary joint, which belongs to the technical field of compensators. The rotary joint mainly comprises an outer sleeve, an inner tube and a gland flange, wherein a thrust ring and a connection baffle ring are fixed in the outer sleeve; a first baffle ring and a second baffle ring are fixed on the periphery of the inner tube, and the wall of the inner tube is provided with a through hole; the gland flange is provided with an extension ring; the end face of the first baffle ring is contacted with the thrust ring, and a rolling piece is installed between the end face of the second baffle ring and the opposite end face of the connection baffle ring; a seal ring is filled between the end face of the extension ring and the connection baffle ring, and a backing ring is installed in the extension ring; a sealing ring, of which the inner circle is provided with a groove, is installed between the first baffle ring and the second baffle ring; and the groove is communicated with the through hole in the wall of the inner tube. In the invention, a reliable double seal is formed by the seal ring and the sealing ring between the outer sleeve and the inner tube, and the abrasion of the sealing ring can be compensated, thereby effectively avoiding leakage at the movable joint of the pipeline for a long time.

The invention relates to a water-tight electric connector for an ocean field, and provides an oil-charging jack capable of hot plugging under water. The oil-charging jack comprises a plug and a socket which are matched mutually; the plug comprises an outer shell and an inner shell; the inner shell comprises an elastic outer wall and a rigid inner container; a plurality of independent cylindrical jack components are arranged in an oil cavity. When the jack is plugged into water, out of water or under water, by the deformation of a plug oil-charging cavity pressure balance membrane, balance of pressures inside and outside an oil-charging cavity is regulated, so that a pressure gradient does not exist inside and outside the oil cavity, deep sea sealing and plugging under water are realized, switching on and switching off of a contact pin and the jack are carried out in insulating oil, an electric arc generated during switching on and separating can be effectively annihilated, and hot plugging is realized.

The invention relates to a knife striking and blowing mechanism of a direct connected main shaft. The mechanism mainly comprises a main shaft 1, a front bearing assembly 28, a rear bearing assembly 25, a sleeve 23, a pull rod 18, a connecting rod 15, a disc-type spring 27, a drawing jaw 20 and a knife striking oil cylinder, and is characterized in that a piston in the knife striking oil cylinder is formed by assembling an inner piston 10 and an outer piston 9; and acting areas A and B of knife striking oil pressure on the inner piston 10 and the outer piston 9 are equal to each other. The mechanism has the advantages that: the knife striking oil cylinder is an unloading oil cylinder, a bearing does not bear a knife striking force, and the accuracy and the life of the main shaft are ensured; and regular appearance, high sealing property and small size are ensured. An air channel is formed between parts, so that simple structure, high reliability and low cost are ensured, and the direct connected transmission shaft does not need to form a through hole in the centre and has a simple structure. After the knife grabbing is finished, compressed air can be released from the bearing, labyrinth of an end cover and other gaps, so that positive pressure of the air of the interior relative to the exterior is kept, and the main shaft 1 can be cleaned and sealed.

The invention discloses a soft-packaged dynamic lithium battery group, comprising: multi-section soft-packaged lithium batteries (5) provide high voltage to the automobile by connecting in series, each soft-packaged lithium battery is placed between two heat emission metal channels (3) which has a through hole in the center and flats on the two ends, placing the assembly in a battery group outer case (2) and filling silicon rubber (6), the air get into the heat emission metal channel (3) central through hole from the air inlet located in the bottom corner of the group outer case (2) and out from the air outlet.

The embodiment of the invention discloses a ceramic valve element achieving double-path water output. The ceramic valve element comprises a valve element shell, an adjusting handle, a drive plate, a moving sheet, a static sheet, a sealing piece and a base from top to bottom. The static sheet is provided with a hot water inlet, a hot water outlet, a mixed water inlet, a first gear water outlet and a second gear water outlet which are connected with pipelines. Three flow guide channels are arranged on the moving sheet, and the flow guide channels of the moving sheet are driven by rotating the adjusting handle of the ceramic valve element to match the static sheet to form a water output closing state or a first gear water output state or a second gear water output state. A spring hole is formed along the end face of the drive plate, and a gear collision bead and a spring are arranged in the spring hole. A gear pit is arranged on the top wall of the valve element shell, and the gear collision bead is located in the gear pit in a pluggable manner along with rotation of the drive plate. According to the ceramic valve element achieving double-path water output, the wear resistance and ageing resistance are improved, the service life is prolonged, locating and mounting are convenient, and processing is easy.

The invention discloses a concave-convex annular sealing structure with flanges, which comprises two pipe ends, two flanges sleeved on the pipe ends, sealing pieces and fasteners, wherein each flange comprises an inner end surface and a through hole. The sealing structure is characterized in that an inner concave part is arranged on the inner end surface of each flange in a position near the periphery of the through hole; the sealing pieces are two composite linings arranged in the inner concave parts and embedded in the pipe ends, and can be in tight contact with each other after the flanges are fastened through the fasteners; and at least one convex sealing ring is arranged on one of the contact surfaces of the sealing pieces. The sealing structure has the benefit effects that the concentricity of connected pipelines can be guaranteed; the composite linings can not protrude radially due to over extrusion; and the sealing effect can be achieved on the condition that no shear stress is generated.

The invention provides a large-caliber sampling device and system for columnar sediments in a lake. The sampling device comprises a sampling tube, wherein a sampling head is connected with the upper end of the sampling tube and comprises an upper cover and an extension rod; the upper cover is detachably connected with the upper end of the sampling tube, and is provided with at least one water outlet; the extension rod is longitudinally arranged at the middle part of the upper cover, and is provided with a weight balancer; a guide hole provided with a downward opening is formed in the middle part of the sampling head; a first piston is arranged inside the sampling tube; a through hole is formed in the middle part of the first piston, and a valve is arranged at the upper part of the first piston; a guide rod is arranged at the upper part of the valve; the guide rod can stretch into the guide hole and can freely move up and down. The system comprises a sampling platform, a jacking device for sediments, a sampler and a sample separating frame. The sampling device provided by the invention can conveniently discharge water inside the sampling tube, and seal the first piston when the sampling tube is lifted upward to prevent sediments inside the sampling tube from slipping off, so that the sampling tube can be conveniently machined into a large-caliber sampling tube.