1379 results about "Backflow" patented technology

The utility model discloses an integrated magnetic flocculation device system and relates to the technical field of water treatment devices. The device comprises a device shell, a central cylinder, a conical mud bucket, a water inlet pipe, a flocculant dosing pipe, a pipeline mixer, a gas inlet pipe for gas stripping, a coagulant aid dosing pipe, a water outlet pipe and a mud discharge pipe, according to the utility model, when water enters, a flocculant is added and mixed on a water inlet pipe by using a pipeline mixer, after water enters the magnetic coagulation area, compressed air is used as a power source for circulation and mixing, a coagulant aid is added above an air release port, supplementary magnetic powder is added to an upper opening of a central cylinder, and water subjected to magnetic coagulation reaction enters the precipitation separation area; when the magnetic coagulation reaction device is used, supernatant is collected by the water collecting tank and then discharged, precipitated sludge containing magnetic powder can slide into the conical sludge bucket to be treated again, redundant sludge is discharged through the sludge discharging pipe, the whole magnetic coagulation reaction and sludge-water separation treatment process is completed in one device, and an independent backflow system is not needed.

The invention discloses an engineering geology grouting reinforcement device, and relates to the field of geology grouting reinforcement, the engineering geology grouting reinforcement device comprises a mounting rack, the mounting rack is fixedly connected with a first telescopic driving part, the output end of the first telescopic driving part is fixedly connected with a mounting plate, and the mounting plate is fixedly connected with a grouting pipe. The grouting pipe is used for pressurizing and grouting, so that the grout enters a reinforcing gap under the action of pressure; after filling is conducted for a period of time, the injection-compression pipe moves downwards, the sealing plate blocks the grouting opening under the action of the spring to prevent grout from flowing back, meanwhile, the injection-compression pipe moves downwards to extrude the grout, the extrusion force is further increased, and geological gaps are filled with the grout more sufficiently. Through the reciprocating operation, the geological reinforcement position can be fully grouted, the stability and strength of the geological structure are effectively enhanced, the quality and reliability of grouting reinforcement are greatly improved, and the reinforcement requirement under the complex geological condition is met.

The invention discloses a novel corrugated paper squeezing device which comprises bearing frames, a conveying belt and a squeezing assembly used for squeezing corrugated paper, the number of the bearing frames is two, the conveying belt is located between the two bearing frames, a fixing frame is arranged at one end of each bearing frame, and a first squeezing roller and a second squeezing roller are arranged in each fixing frame; and the first extrusion roller and the second extrusion roller are symmetrically arranged up and down. The squeezing flannelette outside the conveying belt can reduce tile paper friction, avoid surface scratching and assist in absorbing a small amount of water, the synchronizer controls the electric push rod to stretch out and draw back synchronously and is matched with the guide rod to enable the rotating roller to press the tile paper evenly, local overpressure damage or non-uniform underpressure dehydration is prevented, the water collecting box can collect extruded water, and the valve can drain water in time. Accumulated water is prevented from polluting equipment or flowing back, consumption of follow-up clean water is reduced, residual moisture of the corrugated paper can be further removed through secondary squeezing, moisture residues are greatly reduced, drying power does not need to be additionally increased, and power consumption is reduced.

The invention discloses a micro-mixing nozzle integrating heat pipe cooling and heat regeneration and a combustor, the micro-mixing nozzle comprises a heat pipe assembly I, a micro-mixing sleeve, an air mixing module and a fuel pipe, the micro-mixing sleeve, the air mixing module and the fuel pipe are coaxially arranged, and the heat pipe assembly I comprises a heat conduction ring, perforated fins, a heat pipe and heat pipe radiating fins; the overall combustor comprises a fuel cavity, an air cavity and a cooling cavity which are sequentially, coaxially and fixedly arranged at intervals from bottom to top, and a plurality of micro-mixing nozzles which are symmetrically arranged relative to the center of the overall geometric central axis are installed in the air cavity and the cooling cavity. According to the micro-mixing nozzle integrating cooling and backheating of the heat pipe and the combustor, the inlet area of the combustion chamber can be rapidly cooled, the service life of the combustor is prolonged, meanwhile, heat of the inlet area of the combustion chamber can be effectively utilized to preheat air, and the combustion efficiency is improved. The problem that the service life of an existing combustor is short due to thermal damage of a high-temperature backflow area to a micro-mixing nozzle can be solved.

The utility model relates to a mop cleaning device with a bucket, which comprises a cleaning bucket / a mop head / a wiping object, and the cleaning bucket is provided with a clean water area, a cleaning area and a sewage area which are mutually independent; the mop is characterized in that a supporting part for supporting the cleaning area and the outer wall of the sewage area is arranged in the sewage area, a water squeezing part is arranged on the cleaning area, the middle of the clean water area is communicated with the middle of the cleaning area through a water supply channel, the width of the mop head is L1, the maximum width of the water supply channel is L2, L1 is larger than L2, and the mop further comprises a switch used for opening and closing the water supply channel. A linkage part is arranged on the switch; the mop head and the mop rod are jointly inserted into the cleaning area to move up and down; the cleaning area is further provided with a drainage channel used for draining water squeezed and scraped by the wiping object to the sewage area and a backflow channel used for enabling the water to flow back to the cleaning area. In the process of moving down the mop head, the lower end of the wiping object is sleeved or buckled on the back plate of the mop head, so that the lower end of the wiping object cannot be warped under the action of the squeezing and scraping edge of the water squeezing plate, and smooth cleaning operation and no blockage are ensured.

The invention discloses a comprehensive distribution box, the front side of a dehumidifying assembly is provided with a driving assembly used for driving the dehumidifying assembly to rotate, and the front side of the driving assembly is provided with a humidity detection sensor used for detecting the humidity in a distribution box body. The scraping device comprises an adjusting assembly which is arranged in the distribution box body and is used for being connected with the driving assembly. A rod body of the adjusting assembly is in threaded connection with a scraping assembly which is used for scraping condensation of the top cover. Therefore, the motor drives the rotating shaft to rotate, and the bidirectional lead screw is driven to rotate through transmission of the belt pulley I and the belt pulley IV, so that top cover condensation on the scraper blade is effectively removed; meanwhile, transmission of the belt pulley II and the belt pulley III enables the transmission shaft to rotate synchronously to drive the fan to accelerate air circulation in the box and exhaust moisture; through a multi-stage protection mechanism, condensation is prevented from directly dripping to damage an electric appliance, moisture condensation and backflow caused by internal and external temperature difference are inhibited, and equipment faults caused by condensation water seepage coupling are effectively prevented.

The utility model relates to a cleaning tool with a mop bucket, which comprises the cleaning bucket, a mop head and a wiping object, and the cleaning bucket is provided with a clean water area, a cleaning area and a sewage area which are mutually independent; the mop is characterized in that a water squeezing part for squeezing the wiping object is arranged on the cleaning area, the outer side edge of the water squeezing part forms a squeezing and scraping edge, the top end of the water purification area is closed, the water purification area is communicated with the middle of the cleaning area through a water supply channel, the water supply channel is controlled by a switch to be opened and closed, and the water supply channel also serves as an air inlet channel; in the process that the mop head downwards enters the cleaning area, the top face of the water squeezing piece forms a water guide face which is obliquely arranged in the direction of the squeezing and scraping edge, the water guide face blocks a part of water squeezed and scraped from the wiping object and flows back to the wiping object along the water guide face, and a part of water squeezed and scraped from the wiping object crosses over the upper portion of the water squeezing piece and flows into the sewage area. According to the cleaning tool with the mop bucket, it is ensured that water for cleaning and squeezing every time is clean water, and clean water can be automatically and quantitatively provided every time.

The invention relates to the technical field of cross flow fans, in particular to a dry-type transformer cross flow cooling fan. Comprising a lower shell, an upper shell is arranged at the top of the lower shell, a transverse flow impeller is rotationally installed between the lower shell and the upper shell, air inlets are formed in the front ends of the lower shell and the upper shell, transverse plates are welded to the rear ends of the lower shell and the upper shell, and the two transverse plates are distributed up and down to form an air outlet; an intercepting plate is fixedly connected to the bottom of the inner wall of the upper shell, an air channel is formed in the upper shell, and when airflow passes through the air outlet, part of airflow at the air outlet is intercepted by the intercepting plate, enters the air channel and is exhausted upwards to form an air curtain. By means of the intercepting plate and the air channel, part of air outlet airflow is intercepted to form an air curtain to block hot air backflow, air outlet is concentrated in cooperation with the guide plate of the lower shell, the cooling effect is enhanced, meanwhile, the air inlet opening is increased by means of the adjusting assembly, the air inlet amount is increased, and therefore the problems of hot air circulating suction and low cooling efficiency in the background technology are solved.

The invention discloses a transmission and distribution pattern optimization method for a multi-water-source water supply pipe network system, and the method comprises the steps: solving a multi-water-source initial ratio at a hour level, and determining the boundary of a water supply region of each water source as an energy storage regulation and control static frame; minute-level reversible flow-water head scanning is carried out on the high-level water tank and the two-way pump station to generate a virtual pressurizing unit, reverse matching is carried out to form an energy storage dispatching pre-instruction, and the pre-instruction is locked as an executable instruction after returning to a static frame to verify water source reverse flow, water hammer overpressure and negative pressure pollution; a valve opening and closing sequence and a pump station rotating speed are coded into time-state vectors, the time-state vectors are input into a graph convolutional network transient pressure surrogate model to deduce a pressure envelope in the third hundred seconds in a rolling mode, only when the whole process is in a pipe allowable interval, the pressure envelope is issued to the site, and closed-loop collaborative optimization of the hour-level water source ratio and the minute-level energy storage scheduling is achieved. According to the method, the problems of complex calculation and control in multi-water-source, multi-energy-storage and multi-time-scale coupling are solved.

The invention provides a device and a method for purifying culture circulating water in a higher-place pond, and the method specifically comprises the following steps: the culture circulating water and residual feed and excrement in the higher-place pond flow out from a sewage draining exit at the center of the pond bottom, and gradually flow into a self-settling filter well through a water inlet at the bottom of the well; aquaculture circulating water is filtered by an immersion filtering device in the well and overflows out of the well, and residual feed and excrement settle to the bottom of the well and then are discharged through a shrimp shell excrement drain outlet; the breeding circulating water overflowing out of the well flows through a hypochlorous acid oxidation device to be disinfected; the culture circulating water treated by the hypochlorous acid oxidation device flows into an aeration dechlorination tank to remove harmful gas; the culture circulating water treated by the aeration dechlorination tank flows into the ecological tank, so that the contents of carbon, nitrogen, phosphorus and the like in the water are reduced; and the culture circulating water treated by the ecological pond is pumped into the higher-place pond through a reflux pump. The system is efficient, energy-saving, small in occupied area, high in automation degree and capable of improving the water quality management efficiency and stability of higher-place pond culture circulating water.

The utility model discloses a multifunctional deep sea environment simulation system, and relates to the technical field of deep sea engineering experiment devices. Comprising a wave flow experiment water tank which is a containing cavity capable of bearing water, and the top of the water tank is of an open structure; a deepwater experiment area, a transition experiment area and a shallow water experiment area are sequentially arranged in the water tank according to the wind direction; the fan array is used for providing a wind field with a preset condition required by an experiment above the water body; the flow guide array is used for guiding and controlling air generated by the fan array; the current generation array is used for generating current and completing circulation of the water body in the wave current experiment water tank through a backflow channel; the wave making array is used for generating waves with different periods and wave heights for the water body; and the wave absorbing plate is used for dissipating energy of the generated waves. According to the system, multi-factor combined action experiment simulation can be synchronously carried out, and the design precision is remarkably improved; the wind wave coupling effect on the structure is achieved, and the real sea wind wave environment is simulated.

The invention discloses a retreating type segmented sleeve valve pipe grouting process for karst treatment, and belongs to the technical field of karst stratum reinforcement. The process comprises the steps of drilling construction, device arrangement, grouting positioning, segmented grouting, retreating type displacement grouting and ending treatment, and is characterized in that a grouting core pipe adopts a sealing telescopic connecting structure of an inner core pipe and an outer sleeve, and is matched with a telescopic driving piece, an elastic connecting piece and a first pressure sensor; dynamic adjustment of the size of a grouting space and real-time monitoring of pressure are achieved, and the risk of excessive or insufficient grouting is avoided in an intermittent grouting mode; the vent pipe and the one-way valve are staggered, pressure in the pipe is balanced, the one-way valve is assisted to rapidly retract, and backflow and slurry mixing are avoided; and the optional rotating device and the stirring piece cooperate to prevent slurry deposition, so that the grouting uniformity is improved. The grouting precision and controllability are remarkably improved, safety and stability of construction are comprehensively guaranteed, the grouting filling compactness and long-term stability are optimized, and the method is suitable for layering of karst caves in different forms.

The utility model discloses an atomization humidifier, which comprises a water tank, a humidifier body, a humidifier body and a control device, and the water tank is used for containing water for atomization; the atomization assembly comprises a main body part, a mounting part, an atomization water tank, an atomizer and a water pump, the main body part is connected with the water tank, the mounting part is located in the water tank and communicated with the water tank, the atomization water tank is connected with the mounting part and located at the top of the mounting part, and the atomizer is connected to the bottom of the atomization water tank; the water pump is connected with the mounting part, the water pump is located at the bottom of the mounting part, the water pump can convey water in the water tank into the atomization water tank, the atomization water tank is provided with an overflow hole, and the overflow hole can enable the water in the atomization water tank to flow back into the water tank so that the water level in the atomization water tank does not exceed the working water level. The atomizing water tank is arranged at the top of the mounting part, and the water pump pumps water in the water tank from the bottom into the atomizing water tank, so that the problem of low atomizing efficiency caused by overlarge depth of the water tank is solved, the capacity of the water tank is increased, and the water adding frequency is reduced.

The utility model provides a pond backflow cleaning and floating device, and belongs to the technical field of treatment of suspended impurities in wastewater. Comprising a mounting frame, a box body, a collecting basket, a sewage pump, a medicament tank and a monitor, an adjusting bolt is arranged at the top of the mounting frame, and the box body is movably mounted on the mounting frame through the adjusting bolt; a water inlet allowing water to flow in is formed in one side of the box body, the collecting basket is installed in the box body, and filtering holes are formed in the collecting basket; the sewage pump is positioned in the box body and is opposite to the water inlet so as to guide water flow into the box body and the collecting basket; the medicament tank is positioned in the box body and is used for performing medicament adding treatment on the water flow entering the box body and the collecting basket; a monitor is arranged on the mounting frame and transmits the detected water flow condition to a remote control unit in a signal form, and the remote control unit controls the operation states of the sewage pump and the medicament tank according to the detected water flow condition.

The invention relates to a micro-channel heat exchanger with a flow stabilizing structure and a working method, and belongs to the technical field of heat exchangers. The device comprises a cover plate, a box body and splitter plates, a water inlet and a water outlet are formed in the cover plate, the splitter plates are arranged in the box body at intervals, a micro-channel is formed between every two adjacent splitter plates, a converging-in cavity and a converging-out cavity are formed in the box body, progressive flow stabilizing structures are symmetrically arranged on the inner wall faces of the two sides of each micro-channel, and each progressive flow stabilizing structure comprises a base body and a plurality of protruding parts. The base body is provided with a bottom face attached to the splitter plate, the multiple protruding parts are arranged at intervals in the length direction of the base body, each protruding part is provided with a slope contour and a top arc contour, and the slope contours are lifted to the top arc contours in the direction from the afflux cavity to the afflux cavity. According to the invention, coolant backflow can be prevented, pressure fluctuation can be reduced, the working stability of the radiator can be improved, eddy current can be avoided to the greatest extent, the bubble blocking phenomenon can be reduced, and the wall surface drying phenomenon can be delayed.

The utility model discloses a high-sealing low-error anti-slip water meter which comprises a detection mechanism, first flanges are fixedly connected to the two sides of the detection mechanism, and second flanges are arranged on the sides, away from the detection mechanism, of the first flanges. The water meter is excellent in measurement error and anti-idling effect, the anti-backflow pipes on the left side and the right side of the water meter can effectively prevent water flow from flowing back, when the water flow flows forwards, water pressure pushes the rubber pad and the supporting disc to enable the water flow to pass through gaps, if the water flow flows back, the water pressure enables the rubber pad and the fixing ring to be attached more tightly, backflow is prevented, and the water meter is convenient to use. And the metering error caused by idling is reduced. In the aspect of sealing performance, the adjacent sides of the first flange and the second flange are provided with the annular grooves, the sealing rings are arranged in the annular grooves, the protruding parts of the sealing rings are inserted into the annular grooves, the contact area is greatly increased, the occurrence probability of leakage channels is reduced, the sealing performance is greatly improved, and the device has the advantages of being small in measurement error, good in anti-idling effect and good in sealing performance.

The invention discloses a gravity loop heat pipe based on a vein type flow channel and a radiator. The gravity loop heat pipe based on the vein type flow channel comprises an evaporation assembly, an installation support, a condensation assembly, a medium injection opening communicated with the evaporation assembly, an input copper pipe and a backflow copper pipe. A medium is input into the evaporation assembly through the medium injection port, forms steam after absorbing heat, flows into the condensation assembly through the input copper pipe, and flows back to the evaporation assembly through the backflow copper pipe after completing heat exchange in the condensation assembly. By means of the vein vapor chamber, the condensation efficiency is remarkably improved, the size of the condensation assembly is reduced, the working medium backflow path is prolonged, and more sufficient heat exchange is achieved. The external water cooling structure improves the heat dissipation efficiency, is not limited by the interior of the case, and is flexible to install. In addition, due to different structural designs of the gas pipeline and the liquid pipeline, the problems of backflow in advance and drying of a working medium in the evaporation box body are effectively avoided, and the operation efficiency and reliability of the heat pipe are integrally improved.

The invention discloses a double-jet powder feeding device, which belongs to the technical field of water treatment, and comprises a gas-liquid separation buffer tank for performing gas-liquid separation on mixed slurry, and an exhaust port is formed in the gas-liquid separation buffer tank; the first jet mixing mechanism is used for preliminarily mixing powder and the first water flow; the water supply mechanism is used for mixing water; one end of the second mixing piece is connected with a water outlet of the gas-liquid separation buffer tank; the first jet mixing mechanism comprises a first mixing piece connected with the gas-liquid separation buffer tank at one end and a feeding assembly used for feeding powder to the first mixing piece, and the other end of the first mixing piece and the other end of the second mixing piece are both connected with a water outlet of the water supply mechanism; and the second mixing piece can be used for secondarily mixing the buffered and separated liquid-solid mixed liquid and the second water flow and pressurizing and throwing out the liquid-solid mixed liquid and the second water flow. The device has the effects of effectively solving gas interference, preventing blockage and reflux, and realizing stable, efficient and continuous feeding.

1. The name of the design product: total program range hood check valve (3). 2. The use of the design product: prevent oil smoke backflow to protect kitchen air hygiene. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: front view.

The invention relates to a water backflow prevention nozzle, a water backflow prevention ear washer and an ear canal cleaning method, the water backflow prevention nozzle comprises a nipple-shaped nozzle body which gradually shrinks from a nozzle head part to a nozzle tail part, and the nozzle body is provided with a liquid spraying channel and an air spraying channel which are mutually independent; the liquid spraying inlet end of the liquid spraying channel is fixedly connected with a cleaning liquid bin controlled by a cleaning pump, and the air spraying inlet end of the air spraying channel is fixedly connected with an air spraying pump. The water backflow prevention nozzle not only can prevent cleaning liquid from flowing backwards, but also can improve the ear canal blow-drying efficiency.

The invention relates to the related technical field of vacuum drying, in particular to a vacuum drying device for plastic particle production, which comprises a base, a support frame is fixedly mounted on the upper side surface of the base, and an outer box body is clamped on the inner ring surface of the support frame. According to the vacuum drying device for plastic particle production, through arrangement of a water pump, a spiral pipe and a central pipe, in the using process, the water pump pumps hot water from a water tank through a water suction pipe, the hot water flows into a second connecting pipe through a water inlet pipe and then is shunted through the second connecting pipe, the hot water flows into the central pipe and the spiral pipe, and finally hot water backflow is achieved through a water collecting pipe; according to the whole structure, cyclic utilization of hot water is achieved, cost is saved, meanwhile, the spiral pipe and the central pipe can provide uniform internal and external synchronous heating for materials, and drying efficiency and quality are improved.

This invention relates to the field of FSRU thermal energy regulation technology, specifically disclosing a high-efficiency waste heat and cooling water integrated priority heating system and method for FSRUs. The method includes: responding to collected multi-dimensional operating data, associating and marking the multi-dimensional operating data, and identifying the current operating condition level of the FSRU based on the marking results; if the operating condition level indicates the need for heat source switching, then determining a heat allocation scheme including the target heat source and flow path configuration according to the cross-domain priority matrix corresponding to the operating condition level. This invention can eliminate unstable factors such as fluid backflow, pump cavitation, and control signal oscillation while ensuring rapid response, significantly improving the robustness and switching smoothness of the FSRU energy supply system under extreme sea conditions, and achieving inherently safe cross-domain collaborative control.

A washing device includes a main machine; an inner container assembly which is arranged on the main machine and provided with a washing cavity, the inner container assembly being provided with a liquid outlet hole and a backflow opening which communicate with the washing cavity, bottom wall of the washing cavity inclining relative to horizontal direction, the backflow opening being in the side with lower height of the bottom wall of the washing cavity, and horizontal height of the liquid outlet hole being greater than that of the backflow opening; and a washing module including a water pump and a circulation pipeline, an input end of the water pump communicating with the backflow opening by the circulation pipeline while an output end thereof communicating with the washing cavity through the liquid outlet hole so as to spray cleaning water to a part to be washed in the washing cavity.

The utility model discloses a kind of hot tank exhaust liquefaction structures, including condensate backflow member being fixed on hot tank, steam exhaust pipe being installed on condensate backflow member, condensate backflow member is provided with steam-liquid blending cavity, steam exhaust pipe is provided with the steam passage of intercommunication steam-liquid blending cavity, the inlet end of steam passage is communicated with the inner cavity of hot tank by steam-liquid blending cavity, steam-liquid blending cavity inner wall and steam exhaust pipe outer wall form condensate space, steam converges to form liquid in condensate space inner wall and is backflowed to hot tank by steam-liquid blending cavity. With the effect that hot tank can be effectively pressure-relieved, reduce steam exhaust amount when hot tank pressure-relieved.

The utility model relates to the technical field of filter elements, in particular to a filter material one-way release structure and a filter element, the filter material one-way release structure comprises a pipe body, a connecting part and a water inlet part, one end of the pipe body is provided with a water inlet, the other end of the pipe body is provided with a water outlet, one end of the pipe body is provided with a positioning part, and a cavity for filling a filter material is formed in the pipe body. A baffle and a protruding block are fixedly installed in the cavity, and the back face of the baffle is rotationally connected with a rotating plate. According to the utility model, through the combination of the baffle plate, the rotating plate and the telescopic rod, water flow can only pass through unidirectionally, the backflow of impurities is avoided, the utilization efficiency of a filter material is improved, the purification effect of the water flow during filtration is ensured, and the damage to the filter material caused by reverse flow is prevented; the water flow enters from the water inlet and is discharged from the water outlet after being treated by the filter material; compared with a traditional design, the one-way opening further ensures one-way flow, the filtering effect is optimized, waste of filter materials is reduced, the service life of the filter element is prolonged, and the reliability of the system is improved.

The utility model provides a back-spraying pipe for efficiently and uniformly fermenting pickles, belongs to the technical field of pickle fermentation, and solves the problems that most pipelines are arranged at the bottom of a fermentation box, so that liquid backflow is mainly concentrated in a bottom area, the flowing of the liquid in the fermentation box is mainly represented as local circulation, and the fermentation effect is poor. And overall uniform flow is avoided. A return shower pipe for efficiently and uniformly fermenting pickles comprises a fermentation box, the top of the fermentation box is fixedly connected with a first flow guide pipe, the bottom of the first flow guide pipe is fixedly connected with a second flow guide pipe, the bottom of the second flow guide pipe is provided with a first branch pipe, and the surface of the first branch pipe is symmetrically and fixedly connected with a plurality of second branch pipes. A plurality of second nozzles are symmetrically mounted on the surfaces of the second branch pipes, two placement openings are symmetrically formed in the top of the fermentation box, and closing mechanisms for closing the placement openings are arranged on one sides of the two placement openings. According to the utility model, through the arrangement of the branch pipes, the liquid in the fermentation box can be ensured to flow more uniformly.

The utility model discloses a boiler smoke exhaust pipe, belongs to the technical field of boiler accessories, and provides a boiler smoke exhaust pipe capable of effectively preventing airflow from flowing backwards. The boiler smoke exhaust pipe comprises an inner pipe body and an outer pipe body, the upper end of the inner pipe body is a first horizontal section, and the lower end of the outer pipe body is a second horizontal section; the end of the second horizontal section and the end of the first horizontal section are fixed through a connecting piece, a receding groove is formed in the first horizontal section, the first horizontal section is provided with a one-way opening door in the receding groove, the one-way opening door comprises a configuration ring clamped in the receding groove, and the inner diameter of the configuration ring is larger than that of the first horizontal section. The inner diameter of the configuration ring is smaller than or equal to that of the second horizontal section, and the configuration ring is rotationally connected with two half-moon plates through two parallel limiting shafts on the inner wall. The smoke exhaust pipe is divided into the two sections, each section is provided with the horizontal part, the one-way opening door structure is arranged between the end faces of the horizontal parts, normal smoke exhaust can be achieved, rainwater can be effectively prevented from flowing backwards, and therefore the safety of the boiler is improved.

The utility model relates to the technical field of rail ventilation, and discloses a ventilation device for rail transit, which comprises a ventilation box, a fixing plate is fixedly connected to the front side of the inside of the ventilation box, and bolts are in threaded connection to four corners of the front side of the ventilation box. The rear sides of the multiple bolts all penetrate through the front side of the ventilation box and are in threaded connection with the front side of a fixing plate, an air inlet is formed in the front side of the fixing plate, a draught fan is fixedly connected into the air inlet, an air outlet is formed in the rear side of the interior of the ventilation box, and a hinge is fixedly connected to the top end of the rear side of the interior of the ventilation box. In the utility model, during normal ventilation, airflow inflows to push the valve open, so that the air flows smoothly, the ventilation is stopped or the airflow flows reversely, the inlet pressure is reduced, the gravity shut-off valve is automatically closed by virtue of the hinge under the action of self gravity, the air backflow is prevented, and the one-way ventilation function is realized, so that various weather conditions can be met, and the one-way ventilation device can be suitable for various vehicle types.

The utility model discloses a derusting device for metal product processing, which comprises a derusting pool, the bottom surface of the derusting pool is fixedly connected with a support shell, the support shell is internally provided with a filter box, the upper surface of the filter box is provided with a sealing cover through screws, the filter box is internally provided with a filter plate, and the filter plate is fixedly connected with the support shell. And the bottom face of the rust removal pool fixedly communicates with a filter pipe, the end, away from the rust removal pool, of the filter pipe penetrates through the supporting shell and communicates with the left side face of a filter box, the right side face of the filter box fixedly communicates with a circulating pump, and the output end of the circulating pump fixedly communicates with a backflow pipe. According to the device, a circulating pump is matched with a backflow pipe to feed filtered rust removal liquid into a rust removal pool, a fixing pipe and a spray head are arranged in the rust removal pool, the rust removal liquid is sprayed out through the backflow pressure of the backflow pipe, then the fluidity of the rust removal liquid can be improved, meanwhile, an ultrasonic generator installed on the rust removal pool is matched with ultrasonic rust removal, and the rust removal efficiency is improved. And therefore, the rust removal effect of the metal product can be improved.

This invention discloses a method for connecting a new pipeline to an old pipeline during pipeline relocation without interrupting flow. The method includes the following steps: S1, excavating a working well, with the connection point between the new and old pipelines located within the working well, and jacking the new pipeline into the working well using a pipe jacking method; S2, constructing an inspection well within the working well; S3, providing a cutting rope and a wire saw, placing the wire saw on the ground, wrapping the cutting rope around the section of the old pipeline to be cut, and operating the wire saw from the ground to cut the old pipeline; S4, sealing the abandoned section. This invention, by using a wire saw for cutting, allows construction personnel to operate the wire saw from the ground to cut the old pipeline within the inspection well, eliminating the need for a dry working environment within the inspection well, thus avoiding the need for sealing and preventing problems such as sewage backflow and waterlogging caused by prolonged sealing.