42 results about "Backflow prevention device" patented technology

The utility model relates to a kind of powder backflow prevention devices, including storage bin and filter box, the side fixed mounting of storage bin has feed pipe, fixed mounting is connected with pipe between storage bin and filter box, the other side fixed mounting of filter box has exhaust pipe, the front of filter box is installed with box door, box door is fixedly connected with filter box by bolt, the side installation of box door has filter assembly, filter assembly includes coarse filter plate and fine filter plate, the inside installation of filter box has the anti-backflow component of preventing powder backflow.The utility model can carry out multistage interception to powder by the coarse filter plate and fine filter plate of filter assembly, avoid powder with gas through exhaust pipe and directly discharge, reduce the air pollution caused by powder drift, solve the installation and dismounting structure of existing filter screen more complex, usually need to dismount with the aid of tool, lead to the cleaning, replacement process of filter plate is complicated, consume more time and manpower, affect filtration effect.

The utility model discloses a device for preventing water backflow of an ozone reactor, which can safely, quickly and automatically avoid the risk that water flows back into an ozone generator and comprises the ozone generator and an oxidation reactor, and an ozone outlet of the ozone generator is connected to the oxidation reactor through an ozone delivery pipe. A pressure sensor and a first electric valve are sequentially arranged on the ozone delivery pipe behind the ozone outlet; a water body discharge pipe provided with a second electric valve and an ozone concentration detection sensor is connected into the ozone delivery pipe between the oxidation reactor and the first electric valve; a controller is arranged to control opening and closing of the first electric valve and the second electric valve according to signals of the pressure sensor and give an alarm according to signals of the ozone concentration detection sensor. The device has the advantages of being capable of automatically running to prevent water backflow of the ozone reactor, safe and fast.

The application discloses a sidetracking horizontal well large-diameter open-hole filling and acid washing integrated pipe column and a running method thereof. The pipe column comprises an outer pipe column and an inner pipe column, the inner pipe column is arranged in the outer pipe column, and a casing is arranged outside the outer pipe column. The outer pipe column comprises, from top to bottom, a locking device, an outer channel, a releasing device, a fishing device, a slip, a rubber sleeve, a reverse washing device, a filling outer tool, a backflow prevention device, an open-hole screen pipe and an acid washing outer sealing device. The inner pipe column comprises, from top to bottom, an inner channel, a filling inner tool, a check valve, a jetting pipe, an acid washing inner sealing device, a jet tool, a ball catching device and a bottom liquid flow port. The running method comprises the following steps: drilling fluid injection, pipe releasing, normal mud replacement, tubing pressure test, opening of the locking device, filling, reverse well washing without moving the pipe column, normal rotation releasing, segmented acid washing construction, reverse well washing until the outlet is clean and pipe column lifting. The application has the advantages of short construction period, effective prevention of well wall collapse, short construction period, high safety, and good construction effect.

The invention relates to the technical field of intelligent bathroom accessories, and provides an integrated waterway system and an intelligent pedestal pan. The integrated waterway system comprises a water supply unit, a water storage unit and an overflow module, the water supply unit comprises a backflow prevention device, and an air gap is formed between the liquid inlet end and the liquid outlet end of the backflow prevention device; a water storage cavity communicated with the water supply unit is formed in the water storage unit; the overflow module comprises a flow guide part and an overflow part, and the flow guide part is arranged on the outer side of the backflow prevention device and covers the splashing area of the backflow prevention device so as to receive and guide splashing water splashing from the air gap; the overflow piece is provided with a water collecting groove used for collecting splashing water, the water collecting groove is communicated with fluid of the water storage cavity, and the water collecting groove is provided with a first overflow opening. By means of the arrangement, the overflow module has the dual functions of splashing water recycling and overflow protection at the same time, so that the safety guarantee is provided for the system while water resources are recycled, and the operation reliability and safety of the system are improved.

The utility model discloses an anti-backflow faucet, which relates to the technical field of faucets and comprises a faucet body, an anti-backflow device is fixedly mounted on the peripheral side of the end, connected with a water pipe, of the faucet body, and an anti-backflow component is clamped at the joint of the faucet body and an annular pipe. The backflow preventing assembly comprises an annular baffle, the inner wall of one side of the annular baffle is fixedly connected with a conical flow blocking ring, and the tip end of the conical flow blocking ring extends into the faucet body. According to the anti-backflow faucet, the anti-backflow device is additionally arranged between the faucet body and the water supply pipeline, the anti-backflow device comprises the annular baffle, the side face of the annular baffle is fixedly connected with the conical flow blocking ring, and the tip end of the conical flow blocking ring is inserted into the faucet body. And the generated backflow impact can reduce the impact force for impacting the water supply pipeline under the obstruction of the conical flow choking ring, so that the damage to the water supply pipeline caused by the backflow impact can be effectively avoided.

The utility model relates to an industrial drainage pipeline anti-backflow device in the technical field of anti-backflow. The industrial drainage pipeline anti-backflow device comprises an industrial drainage pipe, a water level flow dividing pipe and a floating lever assembly. The floating lever assembly comprises a floating ball, a hinge rod, a linkage shaft, a lever sleeve strip, a hinge shaft, a linkage block, a linkage valve strip, a rotating shaft and a valve element body. The floating lever assembly is adopted, the linkage block enables the linkage valve strip to rotate clockwise, the sealing ring can achieve closing, plugging and anti-backflow treatment on the inner wall of the industrial drainage pipe, and the industrial drainage pipe anti-backflow device has the advantages of being different from an electric control anti-backflow device, more convenient to use and install, capable of being used for a long time in the condition and environment without depending on electric power and high in stability. Therefore, the problems that the device needs to be used through an electrifying means, is difficult to use for a long time in time in the pipeline blockage process without depending on the condition and environment of electric power, and is poor in use stability are solved.

The application discloses a backflow prevention device, belongs to the field of flood control equipment, and solves the problems that current flood control devices are low in flood control efficiency and cannot effectively prevent accumulated water from overflowing. A fixed column is arranged on each of the two side retaining walls of a garage entrance, and the fixed column extends along the height direction of the retaining wall. A telescopic rod is arranged in each fixed column, and a water screen is arranged between the two telescopic rods. A water screen storage groove is formed in the ground between the two fixed columns, and the water screen storage groove extends along the width direction of the garage entrance. A lifting mechanism is arranged at the top of each fixed column. The two lifting mechanisms are connected with a lifting rod, one end of the lifting rod is connected with the water screen, and the other end of the water screen is fixed to the bottom of the water screen storage groove. The lifting mechanism can drive the lifting rod to move up and down, so that the water screen is unfolded or folded. The application is high in flood control efficiency and can effectively prevent accumulated water from overflowing.

The invention belongs to the technical field of air conditioner drainage protection, and particularly relates to an anti-backflow device used for connecting air conditioner condensate water drainage to a building drainage system, the anti-backflow device comprises an integrated shell, the top and the bottom of the integrated shell are provided with a water inlet and a water outlet respectively, and a partition plate is transversely arranged in the integrated shell; a partition plate is arranged in the integrated shell, the partition plate divides the integrated shell into a water seal cavity and a buffer cavity, the water seal cavity is located above the buffer cavity, a first vertical plate is arranged in the water seal cavity and fixedly connected to the upper portion of the partition plate, an overflowing gap is reserved between the first vertical plate and the top of the integrated shell, and the first vertical plate divides the water seal cavity into a water storage area and a drainage area. A second vertical plate is arranged in the water storage area and fixedly connected to the top of the integrated shell. No matter the air conditioner stops for a long time, the pressure of the building drainage system fluctuates or the building drainage system is blocked, effective response can be made, and it is ensured that the backflow prevention function is continuous and effective.

The utility model relates to the technical field of fire-fighting spray heads, and discloses a high-precision fire-fighting spray head with a built-in anti-backflow device, which comprises a disc top, the bottom of the disc top is fixedly connected with a fixed frame, the inside of the fixed frame is fixedly connected with a motor, the output end of the motor is fixedly connected with a bent handle, and the bent handle is fixedly connected with the anti-backflow device. A water pump is rotationally connected into the bent handle, and angle adjusting assemblies are arranged on the two sides of the fixing frame. The angle adjusting assembly comprises an L-shaped rod and a supporting column, one end of the L-shaped rod is fixedly connected to the outer wall of the fixing frame, and the supporting column is rotationally connected to the interior of the L-shaped rod. According to the utility model, the output end of the motor drives the bent handle to rotate, and meanwhile, the water pump rotates to drive the hollow frame and the supporting rod to rotate in the L-shaped rod, so that the effect of performing rotary spraying on the spraying head is achieved, the problem that when a fire disaster occurs, the fixed spraying head is difficult to extinguish a larger area is solved, and the applicability of the fire-fighting spraying head is improved.

The utility model discloses a rainwater backflow prevention device for rock wool fireproof ocean platform container, relates to ocean platform container technical field. The rainwater backflow prevention device for rock wool fireproof ocean platform container, including container house, the bottom intercommunication of container house is provided with the water pipe, the bottom fixedly connected with U shape water seal pipe of water pipe, the utility model discloses when the external rainwater first enters the closed box inner chamber through the flow guide pipe, the rainwater first accumulates in the slide plate bottom area, along with the water level continuously rising, the float ring of setting in the periphery of drain pipe because of the liquid buoyancy effect and follow the floating, and drive the slide plate along the I -shaped guide rail and slide up, the rising of slide plate further drives the closure plate, makes it gradually close and finally completely covers U shape water seal pipe communication mouth, at this moment, the aperture of U shape water seal pipe is blocked, effectively blocked the possibility that external rainwater through drain pipe reverse flow into container inside.

The utility model relates to the technical field of sterilization machines, and discloses a low-temperature backflow prevention device for UHT high-temperature sterilization, which comprises an outer frame, a material mixing frame is arranged above the outer frame, and a motor is fixedly mounted on the inclined side surface of the material mixing frame. Through cooperative use of a stop block and a manual valve and cooperative use of the stop block and a pump body, when the sterilization temperature cannot reach the sterilization temperature in the early stage and the sterilization effect is not ideal, the pump body can be controlled to work through a controller, and the interior of the sterilization tank is pressurized through the pump body; the material flow in the sterilization tank flows into the backflow pipe through the second communicating pipe again, then the manual valve is manually rotated, the stop block is rotated to be opened and closed, and then the material flow can smoothly flow into the first communicating pipe through the backflow pipe, flow into the pump from the first communicating pipe and flow back into the temporary storage tank again, so that the material flow is temporarily stored; and the situation that part of materials cannot reach the sterilization expectation and can only serve as waste materials to be treated, and waste is caused is avoided.

The utility model discloses a backflow prevention device for an engine oil pump, and belongs to the technical field of engine oil pumps. The device mainly comprises a shell, oil inlet pipes are fixedly connected to the two sides of the shell, an anti-backflow cavity is formed in the inner side of the shell, one end of each oil inlet pipe communicates with the anti-backflow cavity, a connecting flange plate is fixedly installed at the front end of each oil inlet pipe, and an anti-backflow assembly is arranged in the anti-backflow cavity. The connecting plate is fixedly installed at the joint of the oil inlet pipe and the backflow prevention cavity, a telescopic air cylinder is fixedly installed at the front end of the connecting plate, a piston rod is fixedly connected to the front end of the telescopic air cylinder, a backflow prevention plug is fixedly connected to the front end of the piston rod, and the backflow prevention plug is slidably connected with the oil inlet pipe. Telescopic sliding rods are fixedly installed on the two sides of the piston rod, and a rubber layer is fixedly installed at the front end of the backflow prevention plug. According to the backflow prevention device for the engine oil pump, the oil return impact force is reduced, the load of the oil pump is reduced, and the service life of the oil pump is prolonged.

To provide a pipe joint having a backflow prevention part.SOLUTION: A pipe joint according to the present invention includes a joint body (10) formed in a cylindrical shape, a lateral pipe connection portion (14) having an end portion connected to a side surface of the joint body (10) and an opening formed at the end portion and communicating with an inside of the joint body, a bush (25) fitted to the lateral pipe connection portion (14) and to which a lateral pipe is connected, and a backflow prevention portion (29) protruding from an inner peripheral surface of the joint body (10) toward an inside of the joint body (10) and formed in the bush (25).SELECTED DRAWING: Figure 1

Title: Hydraulic Air Backflow Prevention System The invention relates to a hydraulic air backflow prevention system, comprising: - a water collection tank (100); - a water outlet (2); - a hydraulic backflow prevention device (3) connecting the collection tank (100) to the water outlet (2), the hydraulic backflow prevention device (3) comprising a float (31) and a water collection bowl (32) incorporating a cage (4) within which the float (31) is movable according to a water level (NE) in the collection bowl (32). Figure for the abstract: Fig. 1

The utility model relates to the field of medical equipment, in particular to a water backflow prevention device outside a foramen intervertebrale mirror, which comprises a water retaining piece, an upper water retaining piece and a lower water retaining piece, the upper water retaining piece and the lower water retaining piece are both in a super-semicircular ring shape and are both positioned on the circumferential outer wall of a handle of a target foramen intervertebrale mirror, and the upper water retaining piece and the lower water retaining piece are arranged on the circumferential outer wall of the handle of the target foramen intervertebrale mirror. The projections of the upper water retaining piece and the lower water retaining piece on the handle diameter plane of the target intervertebral foramen mirror are circular, and water guiding grooves are formed in the top ends of the upper water retaining piece and the lower water retaining piece. The device has the effect of reducing potential safety hazards of an operation.

The utility model discloses an anti-backflow device for an underground structure, which comprises a water level floating detection valve, an intercepting ditch is arranged at the upper end of a ramp plate of the underground structure, and the water level floating detection valve is arranged at the top of the intercepting ditch; the waterproof roller shutter comprises guide rails and a shutter plate, the ramp plate is provided with a strip-shaped through hole, the strip-shaped through hole is formed in the width direction of the ramp plate, the upper end of the shutter plate is movably inserted into the through hole, the guide rails are laid on retaining walls on the two opposite sides of the ramp plate respectively, and the two guide rails are oppositely provided with vertically-arranged guide grooves. The two opposite sides of the curtain plate are arranged in the guide grooves of the two guide rails in a sliding mode. The driving reel is rotatably mounted between the two retaining walls, and a lifting rope is connected between the driving reel and the upper end of the curtain plate; and the controller is connected to the water level floating detection valve and the driving reel. The underground structure anti-backflow device solves the problems that an existing underground structure anti-backflow method is intelligent and slow in response speed.

The present application relates to the technical fields of building engineering pipeline, and specifically relates to a backflow prevention device for a sewage pipe, which comprises a sewage pipe, a straight pipe penetrating through the sewage pipe, a mounting hole being formed in the sidewall of the straight pipe, an air bag being mounted on the upper portion of the mounting hole, the top end of the air bag being fixedly connected with the upper portion of the mounting hole, a floating ball switch being arranged in the annular space formed between the straight pipe and the sewage pipe, an air inlet pipe and an air outlet pipe being communicated with the upper portion of the air bag, an air pump being communicated with the other end of the air inlet pipe, the air pump and the other end of the air outlet pipe both being located outside the sewage pipe, an air inlet valve being mounted on the air inlet pipe, an air outlet valve being mounted on the air outlet pipe, a control panel being mounted on an operation panel, a green indicator lamp, a red indicator lamp and a starting switch being mounted on the control panel, the floating ball switch, the air pump, the green indicator lamp, the red indicator lamp, the air inlet valve and the air outlet valve all being electrically connected with the control panel. The backflow prevention device for a sewage pipe solves the problem of backflow of the existing sewage pipe and is suitable for the pipeline for conveying or discharging sewage.

The invention relates to the technical field of municipal drainage, and discloses a pollution reduction and river water backflow prevention device and method based on fluorescence indication. According to the pollution reduction and river water backflow prevention and treatment device based on fluorescence indication, the concentration of pollutants in the sewage can be monitored in real time through the fluorescence monitor in the water quality monitoring and purifying integrated floating unit (for example, the content of organic matter or specific pollutants is reflected through relative fluorescence intensity), and river water level data of the water level monitoring part are combined; and the control terminal dynamically judges the drainage demand and carries out active regulation and control. Meanwhile, the water level data of the river channel and the fluorescence monitoring data are combined, so that the control terminal can comprehensively judge whether the water quality of sewage is superior to that of river water or not and then judge whether to close or open the flap valve or not. Compared with a traditional mode, pollutants deposited in the pipeline can be reduced in dry seasons or the initial stage of rainfall, and overflow pollution is reduced and river water is prevented from flowing backwards when the water level of the river channel rises rapidly.

The utility model relates to a hot air backflow prevention device of a radiator, which belongs to the technical field of vehicle radiators and comprises a shell and a blocking mechanism, the shell comprises a hood body, the radiator is mounted in the hood body, and a wind scooper extending towards the direction of an exhaust outlet of the radiator is arranged on the periphery of the hood body; the blocking mechanism comprises a plurality of wind blocking blocks, the wind blocking blocks are installed between the radiator and the wind scooper, and the multiple wind blocking blocks surround the radiator to form a heat dissipation channel. By arranging a plurality of wind blocking blocks around the wind scooper and the radiator, the sealing performance between the wind scooper and the radiator is ensured, and the hot air backflow phenomenon of the radiator is effectively avoided. In addition, due to the design of the multiple wind blocking blocks, when a certain wind blocking block is deformed or aged, the whole wind blocking block does not need to be replaced, and therefore the maintenance cost of the hot air backflow prevention device is reduced.

The invention discloses an oil smoke reverse suction prevention device for an internal thread copper pipe, which relates to the technical field of non-ferrous metal processing and is used for being mounted on an annealing purging rod, an air inlet is formed in the annealing purging rod, the annealing purging rod comprises an air guide head, a conical air separation cover and a spring, the air guide head is arranged on the annealing purging rod, and the conical air separation cover is arranged on the air guide head. A gas guide head inlet and a gas guide head inner hole which are communicated with each other are formed in the gas guide head, the gas guide head inner hole is communicated with the gas inlet, the conical gas insulation cover is arranged in the annealing purging rod, one side of the conical gas insulation cover is over against the gas inlet, and the other side of the conical gas insulation cover is connected with the inner wall of the annealing purging rod through a spring. By arranging the oil smoke suck-back prevention device for the internal thread copper pipe on the air inlet of the finished annealing purging rod, inert protective gas can be conveniently guided into the annealing purging rod, meanwhile, oil smoke gas in the atmosphere in a furnace in the annealing process can be effectively prevented from being sucked back into the inner wall of the copper pipe after inert gas purging is completed, and the service life of the copper pipe is prolonged. Oil smoke is prevented from entering the copper pipe for secondary cooling condensation, so that the residual oil value of the inner wall of the copper pipe is reduced.

The utility model discloses a U-shaped blowdown anti-reflux device of a gas-liquid separator, which belongs to the technical field of gas-liquid separation and comprises a separator main body, the bottom of the separator main body is communicated and connected with a blowdown block, and one end, far away from the blowdown block, of a blowdown pipe is connected with an electric ball valve. A control unit used in cooperation with the flow sensor and the electric telescopic rod is arranged on the side, located on the electric telescopic rod, of the fixing frame. The electric telescopic rod firstly drives the blocking block to block the sewage discharging block, so that the sewage flow is gradually reduced, the water hammer effect caused by sudden reduction of the water flow speed when a valve is directly closed traditionally is avoided, the problems of pipeline vibration, connecting piece looseness, pipeline breakage and the like caused by the water hammer effect are reduced, and safe and stable operation of equipment is guaranteed; the service life of the equipment is prolonged, the flow sensor monitors the flow in real time, the control unit is matched to accurately control the electric telescopic rod and the electric ball valve, meanwhile, the problems of low pollution discharge efficiency, equipment corrosion and the like caused by leakage are prevented, and it is guaranteed that the pollution discharge process is efficient and environmentally friendly.

The utility model provides a desilting device for a water conservancy project, and relates to the technical field of desilting devices, the desilting device comprises an anti-backflow device, the anti-backflow device comprises a shell, a blocking ring is fixedly installed on the inner wall of the shell, rectangular grooves are formed in the two sides of the shell, and fixing rods are fixedly installed in the rectangular grooves. When suction is not carried out, the reset spring drives the connecting plate to move, the fixing cylinder drives the sliding rod to move, meanwhile, the jacking spring drives the blocking block to move, the inner wall of the blocking ring is blocked, and sludge is prevented from flowing back and being blocked in the suction pipe. The defects that sludge in a suction pipe is prone to backflow, when the sludge is pulled back to a pipeline, accumulated in the pipeline and pulled upwards, the sludge flows out of the pipeline, the sludge easily enters other water layers, the water layers are polluted by the sludge, and the water quality is affected are overcome.

To provide a fan backflow prevention device that can be made smaller and thinner. [Solution] The backflow prevention device (10) of the fan device comprises a main body with an opening, a storage section provided in the center of the opening, a plurality of blades (41) provided in the storage section, and a drive unit (50) provided in the storage section that rotates each of the plurality of blades (41). The rotation of the motor (51) of the drive unit (50) is transmitted to a worm gear (52) ~ first gear (54) ~ internal gear (53), and further linked to a second gear (55) which is connected to the internal gear (53) and rotates in accordance with the rotation of the internal gear (53), thereby rotating the plurality of blades (41) via a blade gear (421) connected to the second gear (55). Depending on the rotation position of the second gear (55), the device switches between a storage state in which the plurality of blades (41) are stored in the storage section and a shielded state in which the plurality of blades (41) shield the opening.

This utility model discloses a liquid backflow prevention device for a ventilation system, including a fitting frame and a duct. The fitting frame is located at the lower end of the duct, and a liquid drain pipe is connected to the middle of the lower end of the duct. Positioning blocks are fixed on both sides of the duct, and an adjustment chamber is provided inside each positioning block. A slot is provided on one side of the adjustment chamber, and a slot is provided in the middle of the slot. A pull rod is provided inside the adjustment chamber, with a handle fixed to one end of the pull rod and a locking block fixed to the other end of the pull rod, engaging with the slot. A spring connects one end of the locking block to one end inside the adjustment chamber. Insert blocks are fixed on both sides of the upper end of the fitting frame, engaging with the locking block and the slot. This utility model is designed for easy assembly and disassembly, facilitating liquid handling.

The utility model relates to the technical field of single crystal furnaces, in particular to a volatilization and falling prevention device of a single crystal furnace seed crystal lifting and rotating structure. The inner diameter of the fixing sleeve is in transition fit with the outer diameter of a rotating shaft, a radial positioning mechanism is arranged between the fixing sleeve and the rotating shaft rod, a collecting and guiding mechanism is arranged at the top of the fixing sleeve, and the edge of the collecting and guiding mechanism is in clearance fit with the inner wall of a shaft rod cavity. By arranging the collecting and guiding mechanism, rising metal volatile matter can be intercepted and guided, the attachment amount of the metal volatile matter on the surface of the rotating shaft rod is reduced, the collecting and guiding mechanism can prevent the fallen volatile matter from directly falling back into a melt, and the melt component pollution risk is reduced; the structure stability in a high-temperature environment is favorably maintained, and the normal lifting and rotating motion of the seed rod are not influenced.

The utility model discloses an anti-backflow device for a ventilation valve of a clean room, which relates to the technical field of ventilation valves and comprises a shell, a valve body is mounted at one end of the shell, and a plurality of ventilation baffles are vertically arranged in the shell at equal intervals. The shell is provided with a rotating mechanism used for conducting one-way synchronous rotation on the multiple ventilation baffles. Through the rotating mechanism, the ventilation baffle can be gradually rotated and reset along with weakening of wind power, so that the backflow condition is effectively prevented, the ventilation baffle can be quickly disassembled and assembled during replacement, and the purpose of conveniently and quickly replacing the ventilation baffle can be achieved.

The utility model discloses a W-shaped flame boiler burner high-temperature flue gas backflow prevention device which comprises a nozzle and a primary air branch pipe, one end of the primary air branch pipe is connected with a pulverized coal receiving pipeline of each burner through the nozzle, and the other end of the primary air branch pipe is connected with a primary air header pipe. And the orientation of the nozzle is the same as the coal feeding direction of the pulverized coal receiving pipeline. By means of the structural design of the device, the situation that high-temperature flue gas flows backwards when the combustor is shut down is effectively prevented, and safe operation of the boiler is guaranteed.

To provide a non-cooperative backflow prevention device that suppresses variation in injection volume.SOLUTION: A backflow prevention device (25) in which a backflow prevention ring (30) rotates relative to a head (32) during metering includes: a push metal (27); a shaft (28) protruding from the push metal; the backflow prevention ring (30) penetrated through the shaft (28); and the head (32) provided at a tip of the shaft (28). The head (32) includes a plurality of contact surfaces (42) that contact an end surface (34) of the backflow prevention ring (30). A ringing release structure (43) is formed near these contact surfaces (42) to release ringing caused by the contact surface (42) and the end surface (34) coming into close contact.SELECTED DRAWING: Figure 3A

The invention relates to the technical field of charging piles, in particular to an anti-backflow type charging pile which comprises a box body, the box body is provided with a sealed waterproof access door, an electrical element and a heat dissipation element are arranged in the box body, and the electrical element comprises a power transmission unit and a communication module. The heat dissipation element comprises a plurality of air channels used for heat exchange and arranged on the side wall of the box body and a fan installed in the box body, and the air channels used for heat exchange at least comprise an air inlet and an air outlet. The air inlet and the air outlet of the box body are respectively provided with a protection device for preventing waterlogging, flood and strong wind and rainstorm from flowing backwards into the box body, the protection device comprises a rainwater backflow prevention device and a flood backflow prevention device, and the rainwater backflow prevention device can prevent water from flowing backwards by changing the rainwater flowing directions of the air inlet and the air outlet. Rainwater is prevented from entering the box body from the air inlet or the air outlet in strong wind weather, and the flood backflow prevention device comprises a detection module and a sealing module electrically connected with the detection module.