79results about How to "Normal drainage" patented technology

The invention belongs to the technical field of air conditioners, and particularly relates to an air-conditioner and a drainage control method thereof. The air-conditioner and the drainage control method thereof aim to solve the problem that a drainage method of an existing air-conditioner is not efficient enough. The drainage control method comprises the steps that coil pipe temperature and current dew point temperature of an indoor unit are obtained; and a drainage pump is controlled selectively according to the coil pipe temperature and the current dew point temperature of the indoor unit.According to the drainage control method, the coil pipe temperature and the current dew point temperature of the indoor unit are taken as basic parameters to judge whether the indoor unit may generatecondensate water or not, so that the air-conditioner can control the drainage pump to operate selectively according to the generating conditions of condensate water, and thus operating states of thedrainage pump can be adjusted correspondingly according to different requirements, and then the operating efficiency of the drainage pump is guaranteed effectively.

The invention discloses a composite drainage pipeline, which comprises an outer protective layer, wherein a mounting cavity is formed in the middle of the outer protective layer, and one or more sealed auxiliary drainage pipes are arranged on the inner wall of the mounting cavity in a ring; a drainage diversion cavity is arranged in the middle of each auxiliary drainage pipe, and the auxiliary drainage pipes are arranged adjacent to each other; a water inlet cavity is formed between the two adjacent auxiliary drainage pipes, and a main drainage pipe is arranged in the middle of the mounting cavity; the outer wall of the main drainage pipe is wrapped with a silicone sealing layer, and the outer wall of the silicone sealing layer is in contact with the outer wall of each auxiliary drainage pipe in a compression way. When one side of the drainage pipeline is damaged, the damaged side can be avoided by only rotating the main drainage pipe to achieve normal drainage.

The invention relates to an anti-reflux continuous bladder irrigation liquid collection bag which comprises a drip cup and a collection bag body. The upper portion of the drip cup is connected with an anti-reflux mechanism through a second drainage tube, the anti-reflux mechanism comprises an outer cylinder, an inner cylinder, a partition plate and a movable plug, an inlet and an outlet are formed in the upper end and the lower end of the outer cylinder respectively, the outlet is hermetically connected with the upper end of the second drainage tube, the bowl-shaped partition plate is arranged in the outer cylinder below the inlet, the upper end of the partition plate is fixed to the inner wall of the outer cylinder, an overflowing hole is formed in a central zone of the partition plate, the movable plug is arranged below the partition plate, a sealing column matched with the overflowing hole is arranged at the top of the movable plug, the movable plug is clamped in the inner cylinder, the inner cylinder is arranged in the middle of the outer cylinder, a liquid outlet channel is formed between the inner cylinder and the outer cylinder, an inlet of the liquid outlet channel is arranged on the upper side of the inner cylinder, a collection cylinder is mounted at the bottom of the movable plug, the lower end of the collection cylinder is open and positioned on the upper side of the outlet, and a sterilizing layer is arranged on the inner side of the collection bag body. Irrigation liquid can be prevented from reflux in accidental action by the anti-reflux mechanism, so that use safety of a patient is protected.

The invention provides an air-conditioning system. According to the air-conditioning system, a compressor, a four-way valve, an outdoor heat exchanger, a subcooler, a throttling component and an indoor heat exchanger are arranged in sequence to form a refrigerating loop; the outdoor heat exchanger comprises a first current collecting device, a second current collecting device and a plurality of current passing pipes which are connected between the first current collecting device and the second current collecting device; the subcooler comprises a first current passing channel and a second current passing channel, the first end of the first current passing channel communicates with the second current collecting device, and the second end of the first current passing channel communicates with the throttling component; the first end of the second current passing channel communicates with the low-pressure air suction end of the compressor, and the second end of the second current passing channel is connected with a first electromagnetic valve in series and communicates to the second end of the first current passing channel; and a switching device and at least one current passing pipe are connected in series and arranged between the first current collecting device and the second current collecting device, and the switching device further communicates with the first electromagnetic valve. The invention further relates to a control method. By the adoption of the control method, a low-temperature heating deicing function of the air-conditioning system is achieved, and normal drainage of drainage holes in the bottoms of the heat exchangers is guaranteed.

The invention provides a buried pipe drainage device in cropland on an unsaturated condition and a laying method of the buried pipe drainage device. The buried pipe drainage device comprises a buried pipe and a filtration sand layer; the buried pipe is horizontally arranged in soil; drainage holes are formed in the buried pipe; and the filtration sand layer is arranged in the soil, and covers the buried pipe partly, and is located on the buried pipe. With the adoption of the technical scheme, the problem in the prior art that water can not be drained into the buried pipe easily when soil water is in an unsaturated state is solved.

The invention discloses a battery pack, relates to the field of batteries, and is used for optimizing the structure of the battery pack. The battery pack comprises a box body, a battery module and a blocking piece. The box body comprises an accommodating cavity and a liquid discharging hole communicated with the accommodating cavity. The battery module is mounted in the accommodating cavity. The blocking piece is installed in the box body and located between the liquid discharging hole and the battery module so as to prevent glue used for fixing the battery module from entering the liquid discharging hole. According to the technical scheme, the blocking piece can play a role in reducing or even preventing the glue for fixing the battery module from blocking the liquid discharging hole.

The invention discloses an anti-blocking device based on building water supply and drainage. The anti-blocking device comprises a vertical tube and a bent tube, wherein a sheath is fixedly connected with both sides of opposite ends of the vertical tube and the bent tube; support rods are fixedly connected with bottoms of both sides of the inner wall of the vertical tube; an inner tube is fixedly connected between opposite ends of the two support rods; a support plate is fixedly connected with the bottom between both sides of the inner wall of the inner tube; the support rods are rotationally connected with the top of the support plate. The invention relates to the technical field of building water supply and drainage. According to the anti-blocking device based building water supply and drainage, transverse rods are rotationally connected to the top between both sides of the inner wall of the vertical tube, then garbage can be cut through spiral blades, large-size garbage can be crushed, a pipeline can be prevented from being blocked by the garbage, one end of a rotating rod penetrates through a tank body and the bent tube and extends into the bent tube, then normal water drainagein the pipeline is ensured, the garbage can be cleaned off in time, and a good living environment can be provided for residents.

The invention relates to a sponge city rainwater treatment system, and relates to the technical field of sponge cities. The sponge city rainwater treatment system comprises a base soil layer; a planting belt is arranged on the base soil layer; a water storage tank is arranged in the planting belt; a water storage module communicated with the water storage tank is arranged in the base soil layer; the water storage module comprises a rainwater regulating tank, a PP module group collecting tank and a filtering front pool; a residential area is arranged on the base soil layer; the residential areais connected with the filtering front pool; the base soil layer is provided with a water-permeable pavement mould frame for rainwater to penetrate into the base soil layer; the water-permeable pavement mould frame comprises a brick groove, a water-permeable groove and a cushion layer arranged below the water-permeable groove. By arranging a rainwater regulating tank, a PP module group collectingtank, and a filtering front pool, when in extreme rainfall conditions, excess rainwater can be collected so that the sponge city can still drain normally in the face of extreme rainfall.

The invention belongs to the technical field of municipal drainage facilities, and particularly relates to an odor-resistant overflow-resistant floor drain for city pavement drainage. The odor-resistant overflow-resistant floor drain comprises a cylindrical bracket, a cover plate, a first water baffle plate and a second water baffle plate, wherein the second water baffle plate is arranged in a reciprocation movement manner in a vertical direction; when the first water baffle plate is clung to the second water baffle plate, respective hollow parts can be covered by each other to form a waterproof sealed baffle layer; an elastic unit is arranged between the second water baffle plate and the cylindrical bracket; the elastic unit can provide an upward elastic force to the second water baffle plate. As the internal space of a sewer is baffled through the baffle layer formed by the first water baffle plate and the second water baffle plate, and the second water baffle plate and the first water baffle plate are closed under a condition of sunny climate, waste gases inside the sewer can be prevented from overflowing; under a condition of stormy and rainy climate, the second water baffle plate can be opened under the action of gravity of rainwater, then normal drainage can be achieved; under a condition of heavy rain, when sewage inside the sewer flows upwards, the sewage can be effectively prevented from overflowing by the second water baffle plate.

The invention relates to a fuel cell system with a waterway pressure regulating function. The system comprises a water tank, a high-pressure air source, an air injection pipeline, an exhaust pipelineand a drainage pipeline, wherein the water tank is arranged in a cooling waterway of the fuel cell and is connected with an air injection pipeline, an exhaust pipeline and a drainage pipeline which are relatively independent; the air injection pipeline is connected with a high-pressure air source through an air injection control valve; and the air injection control valve, the exhaust control valveand the drainage control valve of the air injection pipeline, the exhaust pipeline and the drainage pipeline are respectively connected with a fuel cell control system. The exhaust pipeline and the drainage pipeline can be combined into an exhaust / drainagepipeline; and the exhaust pipeline can be directly connected with an air inlet pipeline of the fuel cell. The system is simple in structure and easy to implement, is not influenced by the operation pressure of the fuel cell, dynamically adjusts the pressure of the cooling waterway of the fuel cell, further controls the pressure difference between the two sides of a water permeable plate to be always in a reasonable range, protects the water permeable plate from being damaged, and can normally perform water drainage and exhausting.

The invention discloses a drainage pump and a washing machine with the same. The drainage pump includes a pump shell, a piston assembly, an impeller and a driving device, wherein the pump shell is internally provided with a drainage cavity, and a water inlet and a water outlet which are communicated with the drainage cavity are formed in the pump shell; the piston assembly is movably arranged on the pump shell, and an air storage cavity which is communicated with the drainage cavity and has a variable volume is defined on the pump shell by the piston assembly; the impeller is rotatablely arranged in the drainage cavity; the driving device is installed on the pump shell and in transmission connection with the impeller. According to the drainage pump, by arranging the piston assembly, and adopting the piston assembly and the pump shell to define the air storage cavity with the variable volume, the piston assembly can move according to the work conditions of the drainage pump, therefore,the capacity of the air storage cavity can be increased or decreased, it is ensured that water flow can be normally sucked and discharged, the problem of air trapping is effectively solved, and then the work efficiency of the drainage pump is improved.

The invention discloses a pressure-adaptive continuous drainer for a gas conveying pipeline. A steam inlet pipe and a steam drainage pipe are mounted on the sidewall of a secondary tubular body which is provided with an upper end plate and a lower end plate, a discharge pipe is arranged on the lower end wall of a primary tubular body, a bracket guide pipe is connected to the wall of the primary tubular body, a horizontal water outlet pipe penetrates through a bracket stuffy plate, extends into the internal cavity of the primary tubular body, and is then connected with a vertical water outlet pipe, the vertical water outlet pipe which is provided with a sealing ring is located among a plurality of lower guide rods, a transition plate is fixedly connected to the lower side face of a lower pontoon end plate, and the guide rod at the center position of an upper pontoon end plate is located in an upper guide sleeve at the center position of an upper cover plate. A horizontal water inlet pipe is mounted on the sidewall of the lower end of the primary tubular body, the lower end of a vertical water inlet pipe is connected with the horizontal water inlet pipe, and the upper end of the vertical water inlet pipe is connected with a gas conveying header pipe through a water-inlet-end flange. The drainer can automatically adapt to the pressure in the gas conveying pipeline, does not need water replenishment, and is convenient to maintain.

The invention discloses a folding bath room. The folding bath room comprises a fixing plate 1, three water baffling plates 2, a bottom plate 3, a rotating shaft 7 and a shower head 5, wherein the lower end of the fixing plate 1 is provided with the bottom plate 3; the bottom plate 3 and the lower end of the fixing plate 1 are connected through the rotating shaft 7; the bottom plate 3 is upwards turned and folded around the rotating shaft 7; a right angle is formed between every two water baffling plates 2; every two water baffling plates 2 are connected through the rotating shaft 7; the water baffling plates 2 are inwards folded according to a folding sequence; and the three unfolded water baffling plates 2 and the bottom plate 3 form a space of which the bottom is sealed. When the folding bath room is not used, the appearance is attractive and a large amount of space is saved. When the folding bath room is used, water is normally drained and is prevented from splashing around to corrode a wall face, a user does not feel stuffy, and a potential safety hazard is also reduced at the same time.

The invention discloses a gutterway cover, which is characterized by the following: the gutterway cover consists of at least one body and complex filter elements; there are complex slotted holes passing through body; the filter element has the air-proof feature, which can provide for water flow and stop the air current from circulating; the filter element can make the gutterway cover drain in normal and stop the mosquito and marsh gas from outcoming from gutterway cover.

The invention relates to a cultivation and planting method of rhizoma paridis. The method comprises the step of building a shade shed, and specifically comprises: a, a weight glidingly connected to avertical rod is arranged on the vertical rod, a first rack glidingly connected to the vertical rod is arranged on the vertical rod, a second rack is fixed on the weight, a gear meshing with both thefirst rack and the second rack is arranged on the vertical rod, and the vertical rod is inserted into the ground; b, a pull rope is tied between the top of the vertical rod and the weight; c, a grooveis formed in the edge of shade cloth, support rods are connected between the shade cloth and the weight, and a cutter is fixed on the top of the shade cloth; d, a rotating tank is rotationally connected to the vertical rod, spray tubes are communicated with the outer wall of the rotating tank, and a plurality of water baffles are fixed on the inner wall of the rotating tank; e, a plurality of water inlet tubes are communicated with the groove, and the ends, away from the groove, of the water inlet tubes are enabled to face the water baffles. With the technical scheme, the shade cloth can drain water normally during raining, and water accumulation on the top of the shade cloth is prevented.

The invention discloses a scrubber water tank battery module rapid replacement platform and a working method thereof. The scrubber water tank battery module rapid replacement platform comprises a rotating mechanism and transmission mechanisms; all the transmission mechanisms are positioned on the same virtual circle; at least one replacement station and at least one supply station are arranged onthe virtual circle; a water tank battery module is arranged on each transmission mechanism and comprises a clear water tank, a sewage tank and a battery; a water injection pipe is arranged at at leastone supply station; a sewage containing port and a cleaning pipe are arranged at at least one supply station, a charging port is formed in the battery, and a charging pile is arranged at at least onesupply station. The method comprises the following steps that the scrubber runs to a replacement station, the scrubber conveys the exhausted water tank battery module to the transmission mechanism, the transmission mechanism conveys the new water tank battery module to the scrubber, and the replacement platform injects water into the exhausted water tank battery module, cleans the exhausted watertank battery module, drains water and charges the exhausted water tank battery module. The scrubber water tank battery module rapid replacement platform has the advantages of being high in replacement efficiency, low in labor intensity and high in automation degree.

The invention discloses a drainage system for an underground reservoir. The drainage system comprises a water storage container, a water suction pipe head, a first drainage pipe, a second drainage pipe, a desilting pipeline and a gravel bin, wherein one end of the first drainage pipe is connected with the water suction pipe head, and the other end of the first drainage pipe is connected with the second drainage pipe; the second drainage pipe communicates with the gravel bin, and a drainage pump is arranged on the second drainage pipe; the water storage container is connected with the first drainage pipe through a communicating pipeline; one end of the desilting pipeline and the water suction pipe head are arranged side by side, and the other end of the desilting pipeline communicates with the gravel bin; a first control valve is arranged on the communicating pipeline; a second control valve is arranged at the position, between the communicating pipeline and the second drainage pipe, on the first drainage pipe; a third control valve is arranged on the desilting pipeline, and a fourth control valve is arranged on the second drainage pipe. The invention further discloses a control method of the drainage system for the underground reservoir. According to the drainage system and the control method, the water level in the underground reservoir can be intuitively observed, meanwhile, operation under various working conditions can be realized, and thus different requirements are met.

The invention provides a fuel cell humidification system which comprises an electric pile and an air-air intercooler, and the electric pile is connected with a circulating hydrogen inlet assembly through a pipeline; the two sides of the air-air intercooler are detachably connected with a flowing type air transmission assembly, and the middle part of the flowing type air transmission assembly is detachably connected with the electric pile; a circulating water assembly is arranged between the air-air intercooler and the electric pile, and one end of the circulating water assembly is detachably connected with the circulating hydrogen inlet assembly. According to the invention, the structure is more compact through connection of the circulating water assembly and the air-air intercooler, and meanwhile, water and hydrogen are recycled, so that more energy is saved.

The invention relates to an indoor floor drain of a house. The indoor floor drain of the house comprises a base and a sealing cover. The base is a cylinder of which the bottom end is sealed. A drainage pipe coaxial with the base is fixed to the bottom end of the base and penetrates through the base, and the length of the drainage pipe is smaller than the depth of the base. The sealing cover is a cylinder of which the top end is sealed, the inner diameter of an opening in the bottom end of the sealing cover is larger than the outer diameter of the drainage pipe, and the outer diameter of the opening in the bottom end of the sealing cover is smaller than the inner diameter of the base. Through holes are formed in the circumferential direction of the bottom end of the sealing cover at equal intervals. A round cover plate is fixed to the top end of the sealing cover, and drainage holes are formed in the annular surface, exceeding the top end of the sealing cover, of the cover plate at equal intervals. The floor drain is simple in structure, can effectively isolate debris to prevent blockage and can also be sealed to seal liquid and remove smells.

The invention discloses a production process of polymerized diacid ferro-aluminum for water treatment. The preparation method comprises the following steps: a, under stirring, reducing a proper amountof water, 127-168 parts of hydrochloric acid with the total acidity of 30-32% and 8-14 parts of sulfuric acid with the total acidity of 97-99% into a reaction tank for mixing; adding 35-58 parts of iron-containing bauxite trihydrate powder with the aluminum oxide content of 40-45% and the iron oxide content of 20-25% into the mixture at normal pressure and normal temperature, and stirring the mixture to be dissolved; continuously raising the temperature until the temperature of the reaction system is controlled at 105-125 DEG C, and reacting for 3.5-5.0 hours under normal pressure; b, supplementing a proper amount of water into the feed liquid obtained in the step a while stirring; adding 46-63 parts of calcium aluminate powder, raising the temperature of the feed liquid by utilizing reaction self-heating in the adding process, adjusting the density of the feed liquid to be greater than or equal to 1.25 g / ml by using water after adding is finished, then adding 4-7 parts of a synergisttrisodium phosphate, raising the temperature until the temperature of a reaction system is controlled to be 100-115 DEG C, and reacting for 3-4 hours under normal pressure; and c, discharging the feed liquid obtained in the step b to obtain mother liquor.

The invention discloses an automatic drainage device of a compressed air pipeline. A segment of the compressed air pipeline is cut down and connected through a curved pipe, the middle segment of the curved pipe is bent downward, and a diversion pipe is connected to the bottom of the middle segment of the curved pipe; a filter is arranged on the diversion pipe, the bottom of the diversion pipe is connected to an inlet end of a two-position three-way solenoid valve, and two outlet ends of the two-position three-way solenoid valve are connected with two water collection and drainage pipelines respectively; each water collection and drainage pipeline includes a water collection pipe, a water storage tank and a drainage pipe which are connected from top to bottom in sequence, photoelectric switches are arranged on the water storage tanks, each drainage pipe is provided with a first fast opening ball valve and a drainage solenoid valve from top to bottom in sequence, the bottoms of the waterstorage tanks of the two water collection and drainage pipelines are communicated with each other through a horizontal communication pipe which is provided with a second fast opening ball valve, andthe photoelectric switches and all the solenoid valves are electrically connected with a controller. The automatic drainage device has the advantages of being free of gas loss, unlikely to be clogged,high in automation degree and convenient to maintain.

The invention provides an energy-saving hot press. The energy-saving hot press comprises a hot press body, a delivery pipeline used for supplying steam to the hot press body, an air throttle and a digital display regulator used for controlling the air throttle. One end of the delivery pipeline is communicated with a steam oven, the other end of the delivery pipeline is communicated with a platform of the hot press body, and the delivery pipeline is provided with the air throttle used for controlling communicating of the delivery pipeline. According to the energy-saving hot press, the air throttle is arranged on the delivery pipeline for delivering steam from the steam oven to the hot press body to control communicating of the delivery pipeline so that it can be guaranteed that the temperature of the platform of the hot press body is kept within the interval from 95 DEG C to 100 DEG C and the steam can perform full heat exchange in the pipeline in the platform, and thus the effective utilization rate of steam heat is improved. While the good machining and forming effect of the hot press body is guaranteed, the steam heat can be utilized more effectively, and thus production cost is saved and production benefits are improved.

The invention discloses an anti-blocking drainage pipeline for a municipal bridge and a working method of the anti-blocking drainage pipeline. The upper end and the lower end of a filter box communicate with a water inlet pipe and a water outlet pipe correspondingly, a filter plate is arranged in the filter box, and the two sides of the filter box are connected with collecting devices. The pipeline is simple in structure, accumulated water falling into a collecting box from the water inlet pipe can be filtered through the inverted-V-shaped filter plate, impurities in the accumulated water can be reduced, blockage of the bridge drainage pipe is reduced, the filtered impurities can enter the collecting box through the discharging opening and fall into the collecting box through gaps between the material guiding plates, the material guiding plates are connected with the inner wall of the collecting box through springs, reverse flowing of impurities is avoided, the backflow preventing effect is achieved, meanwhile, the material pushing device can press large impurities between the material guiding plates, blockage and impurity retention are avoided, the bridge drainage pipe can normally drain water, accumulated water on the surface of a bridge is reduced, and the labor intensity of workers is reduced.

The invention discloses a water-containing plate for a refrigerator. The water-containing plate comprises a plate body, a first drainage pipe and first heating wires, the plate body is made of a goodthermal conductor material, a drainage outlet is formed in the lowest part of the bottom of the plate body, the first drainage pipe is connected to the drainage outlet, and the first heating wires areevenly arranged on the outer side wall of the plate body. According to the water-containing plate for the refrigerator, the plate body is heated by the first heating wires, defrosting water passing through the plate body is heated by the plate body, thus the situation that the defrosting water is coagulated on the plate body to form ice blocks is avoided, and it is ensured that the defrosting water on the plate body can be drained from the drainage outlet normally.

The invention provides an energy-saving hot press. The energy-saving hot press comprises a hot press body, a delivery pipeline used for supplying steam to the hot press body, an air throttle and a digital display regulator used for controlling the air throttle. One end of the delivery pipeline is communicated with a steam oven, the other end of the delivery pipeline is communicated with a platform of the hot press body, and the delivery pipeline is provided with the air throttle used for controlling communicating of the delivery pipeline. According to the energy-saving hot press, the air throttle is arranged on the delivery pipeline for delivering steam from the steam oven to the hot press body to control communicating of the delivery pipeline so that it can be guaranteed that the temperature of the platform of the hot press body is kept within the interval from 95 DEG C to 100 DEG C and the steam can perform full heat exchange in the pipeline in the platform, and thus the effective utilization rate of steam heat is improved. While the good machining and forming effect of the hot press body is guaranteed, the steam heat can be utilized more effectively, and thus production cost is saved and production benefits are improved.

The invention discloses a method for controlling drainage of a unit and the unit. The method comprises the following steps that when it is determined that the unit needs to drain water off, and the temperature of the water in a water receiving tray is detected; when the temperature of the water in the water receiving tray is lower than a preset temperature, the water in the water tray is heated; and the heated water is discharged out of the water receiving tray. Therefore, when the water in the water receiving tray is frozen, and the unit has a drainage demand, the water in the water receivingtray can be heated through an electric heating device, so that the state of the water can be in a state that the water can be smoothly discharged (in a liquid state or low ice content state), then the unit can normally drain the water off, and a water pump is prevented from being damaged.

The invention provides an evaporation concentration system. The evaporation concentration system is characterized in that a discharge outlet of a heater is connected with a feed inlet of an evaporation separator, and a steam-water separation system is connected with the heater; a steam-water separator is connected with a liquid level tank, a liquid level sensor is arranged inside the liquid leveltank, a regulation type electric valve is connected with a drain opening of the steam-water separator, and a liquid level monitoring system is connected with the liquid level sensor and is connected with the regulation type electric valve; the opening degree of the regulation type electric valve can be controlled by the liquid level monitoring system according to the liquid level sensor. Accordingto the scheme, the evaporation concentration system has the advantages that the liquid level tank is communicated with the steam-water separator, the internal liquid level of the liquid level tank can be measured by the liquid level sensor, and accordingly the height of the liquid level of the steam-water separator can be monitored; the opening degree of the regulation type electric valve can beregulated by the liquid level monitoring system according to data of the liquid level sensor, so that the drain speed of the steam-water separator can be controlled, the liquid level of the steam-water separator can be guaranteed against being excessively high or excessively low, and liquid impact and gas movement phenomena can be prevented.

The invention relates to a remote drainage control system of a centrifugal pump. The system comprises a soft start cabinet and at least one centrifugal pump drainage device which are arranged at a drainage site end, at least one centrifugal pump start-stop circuit is arranged in the soft start cabinet, and the centrifugal pump drainage devices and the centrifugal pump start-stop circuits are the same in number and are in one-to-one correspondence; a remote control device arranged at a remote end is further included; any centrifugal pump drainage device comprises an electric drainage valve, a centrifugal pump, a water pump motor and a drainage pipeline; and the water outlet end of the centrifugal pump communicates with the drainage pipelines, the electric drainage valves are arranged on the drainage pipelines, and output shafts of the water pump motors are in transmission connection with the centrifugal pump. The water pump motors are electrically connected with the corresponding centrifugal pump start-stop circuits; and all the electric drainage valves, all the water pump motors and all the centrifugal pump start-stop circuits are electrically connected with the remote control device. Start and stop control can be conducted on drainage of the multi-stage centrifugal pump at the remote end, a water pump worker does not need to monitor operation on site, and the labor cost is low.

The invention belongs to the technical field of municipal drainage facilities, and particularly relates to an odor-resistant overflow-resistant floor drain for city pavement drainage. The odor-resistant overflow-resistant floor drain comprises a cylindrical bracket, a cover plate, a first water baffle plate and a second water baffle plate, wherein the second water baffle plate is arranged in a reciprocation movement manner in a vertical direction; when the first water baffle plate is clung to the second water baffle plate, respective hollow parts can be covered by each other to form a waterproof sealed baffle layer; an elastic unit is arranged between the second water baffle plate and the cylindrical bracket; the elastic unit can provide an upward elastic force to the second water baffle plate. As the internal space of a sewer is baffled through the baffle layer formed by the first water baffle plate and the second water baffle plate, and the second water baffle plate and the first water baffle plate are closed under a condition of sunny climate, waste gases inside the sewer can be prevented from overflowing; under a condition of stormy and rainy climate, the second water baffle plate can be opened under the action of gravity of rainwater, then normal drainage can be achieved; under a condition of heavy rain, when sewage inside the sewer flows upwards, the sewage can be effectively prevented from overflowing by the second water baffle plate.