60results about How to "A lot of water" patented technology

A water recovering system for the rain is built up through drilling the vertical overflow channels with a certain depth passing through the water impervious stratum, filling the broken stone, sandy earth and water permoable substance in them, preburying the water collecting tanks communicated with said overflow channels, arranging the water-pumping pipe between ground surface and water collecting tank, and laying a water permeable layer on the broken stone layer. It can collect the rain to supplement underground water and supply the collected rain for other purposes.

The invention provides a wet dust collector belonging to the technical field of mechanisms and solving the problem of complex structure of the existing dust collector. The wet dust collector comprises a shell internally provided with a cavity, wherein an inlet and an outlet which are communicated with the shell are formed in the shell; the shell is internally provided with a partition plate; the interior of the shell is partitioned by the partition plate to form two cavities, namely a cavity I and a cavity II which are adjacent left and right; the lower part of the cavity I is communicated with the lower part of the cavity II; the inlet is located in the upper part of the cavity I; the outlet is located in the top of the cavity II and is fixedly connected with a filter screen; the inlet of the cavity I is provided with a spraying mechanism capable of spraying water mist; the cavity II is internally provided with a baffling mechanism capable of baffling air flow; and a water outlet communicated with the inner cavity of the shell is also formed in the bottom of the shell. The wet dust collector is simple in structure and convenient to mount and dismount.

The invention provides a mixed multistage dust collector belonging to the technical field of mechanisms and solving the problem of complex structure of the existing dust collector. The mixed multistage dust collector comprises a shell internally provided with a cavity, wherein an inlet and an outlet which are communicated with the shell are formed in the shell; the shell is internally provided with a partition plate; the interior of the shell is partitioned by the partition plate to form two cavities, namely a cavity I and a cavity II which are adjacent left and right; the lower part of the cavity I is communicated with the lower part of the cavity II; the inlet is located in the upper part of the cavity I; the outlet is located in the top of the cavity II and is fixedly connected with a filter screen; the inlet of the cavity I is provided with a spraying mechanism capable of spraying water mist; the cavity II is internally provided with a baffling mechanism capable of baffling air flow; and a water outlet communicated with the inner cavity of the shell is also formed in the bottom of the shell. The mixed multistage dust collector is simple in structure and convenient to mount and dismount.

The invention discloses a window type air conditioner with novel water beating rings. An outdoor fan is an axial flow fan; the outdoor fan is provided with water beating rings connected to the tail ends of blades; the diameter of the lee face of each water beating ring is greater than that of the windward face; and the diameter of the water beating ring gradually reduces from the lee face to the windward face, thereby forming an arc. Each blade of the outdoor fan is connected with water beating ring through a shift piece which is a sheet perpendicular to the water beating ring. A plurality of small lug bosses for uplifting condensation water are formed on the inner circumferential surface of each water beating ring. The small lug bosses are uniformly and annularly distributed on the inner circumferential surface of each water beating ring. The flared water beating rings can beat water more deeply, and uplift more water; the small lug bosses is added to enhance the water beating effect of the water beating rings; and the arched water beating rings can efficiently guide air to the condenser, thereby increasing the air quantity and lowering the noise.

The invention provides a hybrid-type dust removal device, which belongs to the technical field of machinery, and solves the problem that the existing dust collector is complicated in structure. The hybrid-type dust removal device comprises a shell with a cavity inside, wherein an inlet and an outlet, which are communicated with the shell, are formed in the shell, a separation plate is arranged in the shell, and the inside of the separation plate is divided by the separation plate into a left cavity and a right cavity, i.e. a cavity I and a cavity II, which are adjacent to each other, the lower parts of the cavity I and the cavity II are communicated with each other, the inlet is formed in the upper part of the cavity I, the outlet is formed in the top of the cavity II, the outlet is fixedly connected with a filter net, the inlet of the cavity I is provided with a spray mechanism capable of spraying water mist, a baffling mechanism enabling airflow to flow in a bending manner is arranged in the cavity II, and a water discharging opening which is communicated with the inner cavity is also formed in the bottom of the shell. The hybrid-type dust removal device is simple in structure and convenient to load and unload.

The invention discloses a method of improving soil by planting vegetables in a coastal prawn culture pond during winter break, in particular vegetables with high economic values are planted in a pondduring winter break, and a large amount of vegetables with high economic values are produced while water quality is purified and water environment is improved. The method of improving soil by plantingvegetables in the coastal prawn culture pond during winter break includes the steps of shrimp pond arrangement, field planting, irrigation and vegetable harvesting. A plurality of vegetable plantingareas are formed by horizontal and vertical ridging, different kinds of vegetables are subjected to field planting in adjacent vegetable planting areas, so that the water improving quality effect of each area is balanced; vegetable planting does not need chemical fertilizer application or pesticide spraying, the method is energy-saving and environmentally friendly, in combination with a good waterdrainage and irrigation system, vegetables of high yield and high quality can be obtained. The method combines prawn culturing and vegetable culturing in the pond together, reflects the sustainable development idea of considering both ecological and economical benefits, and has a broad application prospects.

The invention discloses a novel flat-bottom catenary open channel and a solving method of a hydraulic optimal section thereof. An opening of the flat-bottom catenary open channel is upward, and the section of the flat-bottom catenary open channel comprises a flat bottom and two catenary side edges which are positioned on two sides of the flat bottom and are smoothly connected with the flat bottom.The solving method comprises the following steps: designing the shape of the hydraulic section of the water conveying channel into a flat-bottom catenary section; establishing a solution model of thehydraulic optimal section of the flat-bottom curved open channel; solving the hydraulic optimal section of the flat-bottom catenary-shaped open channel; and solving the normal water depth and critical water depth of the hydraulic optimal section of the flat-bottom catenary open channel. The method has the advantages that the catenary section has no stress concentration point, and the open channelis not prone to have cracks caused by stress concentration. The open channel is small in leakage, good in stability, excellent in hydraulic characteristic, high in anti-freezing capacity and the like, also has the advantages of being flexible in flat-bottom section design, low in construction difficulty, easy to manage and maintain, easy to compact at the bottom and the like, and can improve thewater delivery efficiency, reduce the water delivery loss and reduce the construction cost.

The invention discloses a desilting device for hydraulic engineering. The desilting device comprises support frames, a connecting mechanism and a desilting box. The two support frames are fixedly connected with each other through the connecting mechanism. The desilting box is arranged above the connecting mechanism. A water pumping pipe is arranged on one side of the desilting box, and the other side of the desilting box is provided with a water discharging pipe. Air cylinders are arranged on the side, far away from the desilting box, of the water pumping pipe and the side, far away from the desilting box, of the water discharging pipe. A support plate is arranged below the air cylinders. Support pillars are arranged at the four corners of the support plate, and a stirrer is arranged at the middle position of the support plate. The connection and separation of position limiting holes and position limiting pins can realize the position adjusting function of an outer connecting member and an inner connecting member, namely, the function of free adjustment of the length of the connecting mechanism is realized, so that the desilting operation for hydraulic engineering with a variety ofwidths is adapted, and the applicability is wide.

The invention provides a convenient heat-preservation bathroom, and relates to the technical field of application of articles of daily use. The convenient heat-preservation bathroom comprises an upper water tank, a lower water tank, a heating device, a connecting pipe and a plurality of heat isolation plates, wherein the multiple heat isolation plates are fixed between the upper water tank and the lower water tank; the heat isolation plates, the upper water tank and the lower water tank form a closed bath space together; the upper water tank is provided with a water inlet used for water injection and a water outlet used for taking a bath; the heating device is arranged in the lower water tank; and the two ends of the connecting pipe communicate with the upper water tank and the lower water tank correspondingly and the connecting pipe is located in the bath space. The technical problem that some remote mountain areas and villages have no bathroom specially used for bath due to limitation of economical conditions and the like, and consequently it is difficult to take a bath in cold weather is solved.

The invention relates to an automatic heat exchange system for well water. Generally, water air conditioners, ground-source energy air conditioners, and chemical, textile and plastic industries use well water at a temperature of about 15 DEG C to prevent sunstroke and reduce temperature, and water pumps which are easy to damage and waste the electricity are used for pumping water. An investigation concludes that underground water is stored on layers because of different geological structures; moisture over 35 meters to underground has fast penetration, short update time and abundant reservesbecause of short distance to the ground surface; and lower layer well water over 100 meters is naturally penetrated for hundreds of years, generally stays in a scarce and exhausted state and even leads to ground sedimentation because of long-term excessive drawing. Therefore, Chinese government makes explicit orders to seal wells and prohibit exploitation, and carries out recharge water supplementto increase groundwater reserves. The automatic heat exchange system for the well water makes well water automatically rise and circulate to carry out heat exchange by building underground water stream channels and skillfully using siphon water stream energy of upper layer water to lower layer water, achieves double utilization of geothermy and water energy, saves electric power and also increases the groundwater reserves.

The invention discloses water filtering and circulating equipment for drainage engineering, and a working method thereof. The water filtering and circulating equipment comprises a condenser, a sludgedrying mechanism, a filtering mechanism and a conveying pipe, wherein the filtering mechanism is installed on a supporting frame, the sludge drying mechanism is arranged under the discharging end of the filtering mechanism, the condenser is arranged on one side of the sludge drying mechanism and connected with the condenser, the conveying pipe is arranged under the discharging end of the sludge drying mechanism, the top end of a centrifugal cylinder is rotatably connected with the top surface of a filter box, the bottom end of the centrifugal cylinder is connected with a sewage discharge pipe,the bottom end of the sewage discharge pipe extends out of a transfer box and is rotatably connected with the transfer box, a plurality of groups of filter holes are uniformly formed in the arc-shaped side wall of the centrifugal cylinder and the side wall of the sewage discharge pipe respectively, and a water storage bin is formed between the inner walls of the filter box and the transfer box and the outer wall of the centrifugal cylinder. The equipment of the invention has the advantages that water for drainage engineering is filtered through the centrifugal effect, so that the filtering efficiency is greatly improved, and filtered sludge can be automatically discharged.

The invention discloses a rapid bus driving roadbed which comprises, from bottom to top, a soft soil base layer formed by leveling and tamping soft soil and pre-embedded with a main drainage pipe; a gravel layer which is formed above the soft soil base layer by pouring gravel and cement, wherein a retaining wall, a bearing frame and a monitoring structure are arranged in the gravel layer; a rubble layer which is formed by pouring rubbles and cement, wherein a water tank is arranged in the rubble layer; a water permeable brick layer which is a brick body formed above the gravel layer, wherein the water permeable brick layer is provided with a water permeable structure; an asphalt concrete layer which is formed above the water permeable brick layer, wherein the asphalt concrete layer comprises lower coarse-grain asphalt concrete, upper medium-grain asphalt concrete and stiffening rods inserted between the lower coarse-grain asphalt concrete and the upper medium-grain asphalt concrete; and a pavement layer which is formed above the asphalt concrete layer. According to the rapid bus driving roadbed, rapid drainage can be achieved, the safety of rapid bus driving in rainy days is improved, meanwhile, pavement settlement is controlled, effective jacking and timely response are conducted, and the service life of the rapid bus driving roadbed is prolonged.

An unobstructed full-circle sprinkling and stabilized pressure drip-proof micro atomizer comprises a cap, a body fitly mounted to the cap, and a reflector connected with the body. The unobstructed full-circle sprinkling and stabilized pressure drip-proof micro atomizer is characterized in that the body is connected with the reflector through a fixing rod with T-shaped section, the body is hollow and is internally provided with a cavity having T-shaped section and fitting mounting of the fixing rod, the reflector is provided with a fixing rod mounting hole, the fixing rod is mounted in the cavity of the body, the tail end, extending out, of the fixing rod is inserted to the reflector and in tight fit with the fixing rod mounting hole. A mounting and application method of the atomizer includes: the atomizer is mounted; the cap is connected to an inflow pipe of a spray irrigating unit in a threaded manner or through a bevel connector; an opening pressure value of the atomizer is determined according to magnitude of elasticity of a pressure-stabilizing drip-proof membrane; when interior water pressure of the inflow pipe is higher than the opening pressure value of the atomizer, spray irrigation water flows through the pressure-stabilizing drip-proof membrane and is atomized by the reflector, and full-circle sprinkling starts.

Disclosed is a double-stage spraying roadbed material maintenance device. One end of a water inlet pipe is connected with a water source. The other end of the water inlet pipe is connected with a high-pressure water pump. A waterway passing the high-pressure water pump is connected with a rubber pipe. The rubber pipe is connected with a grading water pipe fixed to a rotary shaft. The bottoms of two sets of hydraulic jacks are fixed to a rack. The extending ends of the hydraulic jacks are connected with the bottoms of sliding plates correspondingly. An output shaft of a driving motor is connected with the rotary shaft through a speed reducer. The other end of the rotary shaft is connected with the middles of the sliding plates through bearings. The grading water pipe is provided with a first stage spraying head and a second stage spraying head. According to the double-stage spraying roadbed material maintenance device, the grading water pipe, the first stage spraying head and the second stage spraying head are used for distributing pumped-in high-pressure water flow in a shunted mode, the distributing range is larger, the distributed water quantity is larger, and thus the maintenance level of roadbed materials can be promoted effectively.

The invention discloses a method for rapidly increasing species richness and diversity of mercury thallium ore waste storage yard. According to the method, a small amount of industrial and agricultural waste is added into mercury thallium ore waste to serve as a composite modifier to be combined with phytoremediation, so that the richness and diversity of community species in the environment of the mercury thallium ore waste storage yard are rapidly increased; the industrial and agricultural waste are red mud and fish manure respectively, the mass fraction of fish manure added into the mercury thallium ore waste is controlled to be 4.0%-5.0%, and the mass fraction of the added red mud is controlled to be 0.5%-1.0%. According to the method, the fish manure and the red mud are ingeniously applied to the mercury thallium ore waste, so that the environmental condition of high-toxicity mercury thallium ore waste is remarkably improved, the purpose that waste is used for treating waste is achieved, a more suitable environment is provided for phytoremediation after the waste is utilized, and the ecological functions of water and soil conservation, carbon sequestration, biological diversity and the like can be achieved.

The invention discloses an unmanned aerial vehicle cluster cooperative relay fire extinguishing system in a complex space, which belongs to the technical field of unmanned aerial vehicles and comprises a reconnaissance unmanned aerial vehicle, a window breaking unmanned aerial vehicle, a fire extinguishing unmanned aerial vehicle cluster, a master console and a water hose with a water hose joint ring. Firstly, a reconnaissance unmanned aerial vehicle carrying a depth camera and a radar is remotely controlled to carry out fire scene reconnaissance and three-dimensional map construction, then a window breaking unmanned aerial vehicle is remotely controlled to carry out window breaking, then a master console plans a motion path and hovering position coordinates of a water hose and a fire extinguishing unmanned aerial vehicle, and a fire extinguishing unmanned aerial vehicle cluster clamps the water hose to bypass a complex space to reach the position nearby a fire source; and finally, the unmanned aerial vehicle hovers at a hovering position coordinate point and sprays a fire extinguishing agent for extinguishing fire, and a new unmanned aerial vehicle is dispatched by the master console for replacement before power of the unmanned aerial vehicle in work is exhausted. Through cooperative relay of the unmanned aerial vehicle cluster, the water hose can bypass complex obstacles, it is guaranteed that the water hose smoothly conveys a fire extinguishing agent, and long-time uninterrupted fire extinguishing for high buildings and complex spaces is achieved.

The invention discloses a buttock washing device for a toilet. The buttock washing device for the toilet is characterized by comprising an installation plate, a spraying nozzle support and a spraying nozzle; two through holes which are for seat ring positioning screws to penetrate are formed in the installation plate; the spraying nozzle support which is arranged at the front edge of the installation plate is connected with the installation plate; the spraying nozzle is arranged on the lower portion of the spraying nozzle support; a water spraying opening on the spraying nozzle faces to the obliquely upward direction; a rotatable flexible cover plate is arranged on the spraying nozzle to be covered. The buttock washing device for the toilet has the advantages of being large in washing range due to the large-sized spraying nozzle and large in water amount and clean in washing due to a pipe with the large diameter; enabling adjustment of spraying nozzle angles to be convenient and being adapted to different users; being simple in structure and low in cost; enabling existing large amount of common toilets to be transformed due to the fact of being conveniently installed on various ceramic toilets and being benefited to popularization.

The invention provides a wet dust collector, which belongs to the technical field of machinery. It solves the problem of complex structure of the existing dust collector. The wet dust collector includes a housing with a cavity inside, and the housing has an inlet and an outlet communicating with it. The housing is provided with a partition, and the partition divides the inside of the housing into left and right adjacent Two cavities: Cavity One and Cavity Two, the lower part of the above-mentioned Cavity One and Cavity Two communicates, the above-mentioned inlet is located at the upper part of the Cavity One, and the outlet is located at the top of the Cavity Two and is fixedly connected with a filter at the outlet The entrance of the first cavity has a spraying mechanism capable of spraying water mist, the second cavity has a baffle mechanism that can bend the air flow, and the bottom of the shell also has a drainage channel that communicates with its inner cavity. mouth. The wet dust collector has a simple structure and is convenient to assemble and disassemble.

The invention provides a bottom cleaning drum shearer for thin coal seams. The drum shearer is characterized in that a cutting part shell comprises a first cutting drum transmission cavity shell, a transition section shell and a second cutting drum transmission cavity shell; the first cutting drum transmission cavity shell extends out of ledges of a middle groove and transition groove of a scraper conveyer towards the coal wall side via the transition section shell and bends towards the lower part; a top slope cut edge structure and a bottom slope cut edge structure are arranged at the rear end of the transition section shell; inner cavity flanges of first and second planetary mechanisms are respectively connected with inner cavity flanges of the first and second cutting drum transmission cavity shells by bolts; outer end face key grooves of the first and second planetary mechanisms are respectively positioned together with outer end face key grooves of the first and second cutting drum transmission cavity shells by end face flat keys. The drum shearer can be used for effectively solving the problem of triangle coal and satisfy the minimum mining height conditions and the adaptability to change of the thickness of coal seams, and conduces to improving the coal charging effects.

The invention relates to the technical field of cold storage, in particular to a vegetable cold storage method adopting a vegetable cold storage device for cold storage. The vegetable cold storage method comprises the following steps: A, preliminary treatment of vegetables: yellow leaves and soil on surfaces of the vegetables are removed; B, storage of the vegetables: the vegetables are placed on a storage disc, and the temperature in a cold storage body is set at 4-8 DEG C; C, maintenance of the vegetables: spray nozzles are started 1-3 times every day, a tank cover is opened simultaneously, and the spray nozzles are enabled to spray water mist to the vegetables on the storage disc during moving; D, maintenance of the cold storage device: the tank cover is opened, and blades are enabled to rotate for air exhaust; E, taking out of the vegetables. With adoption of the cold storage method in the technical scheme, the wilting speed of the vegetables can be reduced effectively, and off-flavor is reduced, so that the quality guarantee period of the vegetables is prolonged.

The invention discloses a system capable of automatically watering flowers. The system comprises a display screen, a humidity sensor, a processor, a water sprayer, a water pump and a water tank; the displaying screen is electrically connected with the processor; the humidity sensor is buried in the soil and is electrically connected with the processor; the water sprayer is connected with the waterpump; the water pump is electrically connected with the processor; the water pump is fixedly connected to one side of the water tank and is placed in the water tank. the system can automatically detect water content in the soil and make a result be displayed on the display screen in real time, people can conveniently view the result, the system can control the water pump to supply water or stop supplying water according to the detected water content, the water pump opening flow meets required water demands of irrigation of household flowers and plants, the water pump material is safe and sanitary, cannot deteriorate, and is long in service life, the water pump is difficult to rust, and the system is high in automation degree, reliable in working, high in practicability, and applicable tohousehold use.

The invention discloses a method for preventing water leakage of a sink cabinet. The steps are: a. Add a layer of baffle plate in the middle of the sink cabinet to divide the sink cabinet into upper and lower parts; b. The baffle plate is sunken toward the middle, and a Circular small hole; c. Lay waterproof plastic film on the baffle; d. Lay a layer of strong absorbent paper on the top of the film. The center of the strong absorbent paper is provided with a circular small hole matching the baffle, and every Replace the absorbent paper once; e. Sprinkle a layer of water-absorbing powder on the top of the absorbent paper. According to the water absorption of the water-absorbing powder, replace it every once in a while; f. Lay a layer of strong water-absorbing paper on the water-absorbing powder. There is a round hole matching the baffle, and the absorbent paper is replaced every once in a while; g. Set a pipe matching the round hole under the round hole.

The invention discloses efficient comprehensive water treatment equipment which comprises a sedimentation tank and a cleaning structure, a fixed seat frame is arranged on one side of the sedimentation tank, a bidirectional motor is arranged on the left side of the fixed seat frame, a sliding special-shaped block is arranged at one end of the fixed seat frame, and a threaded seat is arranged on the left side of the sliding special-shaped block. A telescopic rod is arranged at the upper end of the sliding special-shaped block, a long rod is arranged at one end of the telescopic rod, a connecting frame is arranged at the lower end of the long rod, a threaded rod is movably installed at one end of the bidirectional motor, one end of the threaded rod is arranged in the fixed seat frame, and the threaded rod is in threaded connection with a threaded seat. The cleaning structure comprises a fixing block. Plastic articles and the like in the sedimentation tank can be cleaned, the labor amount of workers can be reduced, different kinds of garbage can be fished out from sewage, garbage in the leakage net plate can be cleaned, garbage cleaning is facilitated, and environmental pollution is reduced.

The invention relates to the technical field of two-film greenhouse structures and in particular relates to a two-film greenhouse back slope design and construction method. The two-film greenhouse structure comprises a foundation structure and a two-film control structure, wherein a greenhouse framework is arranged above the foundation structure; the two-film control structure is arranged above the greenhouse framework and comprises a shutter machine, waterproof heat insulation films, a heat insulation mat, a linkage column, a film rolling machine and a transparent shed film; the waterproof heat insulation films are arranged on the left and right sides of the film rolling machine; the film rolling machine is arranged above the shutter machine; the transparent shed film is arranged above the linkage column; and diversion structures are formed in the left and right sides of the two-film control structure. According to the two-film greenhouse back slope design and construction method, thecotton quilt is moved backwards by construction measures, so on one hand, the shading area is reduced compared with the traditional method, and illumination shot into the greenhouse is not blocked inthe scheme; on the other hand, the cotton quilt does not block front and rear ventilation openings so as not to form convection.

The invention relates to the field of refrigeration technology, specifically to a vegetable refrigeration apparatus. The vegetable refrigeration apparatus comprises a refrigeration body and a tank cover used for covering the refrigeration body. Several layers of placing trays are arranged inside the refrigeration body. The vegetable refrigeration apparatus also comprises a spray structure, a wind sweeping structure, a driving mechanism and a driven mechanism. A rotating shaft is connected between the refrigeration body and the tank cover. The spray structure comprises a spray box which is slidingly connected with the refrigeration body. The spray box is equipped with tooth bar and a nozzle used for water spray. The wind sweeping structure comprises a rotating rod which is rotatablely connected with the refrigeration body and blades arranged on the rotating rod. The driving mechanism comprises a first bevel gear and a second bevel gear which are intermeshed. The driven mechanism comprises a third bevel gear, a fourth bevel gear and a spur gear. By the refrigeration apparatus in the technical scheme, vegetable wilting speed can be effectively reduced and peculiar smell can be minimized. Thereby, shelf life of vegetables is prolonged.

The invention belongs to the technical field of water purifiers and discloses a water purifying device. The water purifying device comprises an outer frame, wherein an electric pump for sucking a water source is arranged in the outer frame; a whirlpool settler is arranged at the outlet of the electric pump; a purifying component is arranged at the output end of the whirlpool settler; a purified water outlet and a sewage outlet are formed in the purifying component; the purifying component comprises a casing; at least two double-control film ceramic filter elements are mounted in the casing; a lower-end sealing sleeve is arranged at the lower end of each double-control film ceramic filter element; a cruciform rotating block is arranged below each lower-end sealing sleeve; a through hole is formed in the lower end of the casing; a cleaning handwheel shaft penetrates in the through hole and extends out of the casing; a cleaning handwheel is arranged at the end, extending of the casing, of the cleaning handwheel shaft; the inner end of the cleaning handwheel shaft takes a cross shape matched with the rotating block; and a semicircular cleaning plate attached to the outer side surfaces of the double-control film ceramic filter elements is arranged in the casing.

The invention discloses an automatic anti-freezing device of an outdoor fire hydrant and a using method thereof. The automatic anti-freezing device comprises a tubular main body, wherein a water drainage hole is formed in the lower portion of the tubular main body, a mounting base is further arranged in the tubular main body, a rotating shaft is rotationally installed on the mounting base, a cover plate and a water baffle are fixed on the rotating shaft, the cover plate is located above the water drainage hole, and the cover plate is perpendicular to the water baffle; the cover plate and the water baffle rotate around the mounting base through the rotating shaft, and two states that the cover plate is tightly attached to the water drainage hole and the cover plate is separated from the water drainage hole exist; and the automatic anti-freezing device further comprises a bypass pipe, a water ejector is arranged on the bypass pipe, and a water suction pipe is arranged on the water ejector. According to the automatic anti-freezing device, a rotary spring is arranged on the rotating shaft, so that the cover plate is kept in an open state when the cover plate is not used, automatic water drainage is realized, water in a pipeline on a freezing line is discharged into a water collecting pit in a valve well, and the pipeline of the outdoor fire hydrant is prevented from being frozen in winter; and the water ejector can pump back accumulated water in the water collecting pit, and the accumulated water in the water collecting pit is automatically discharged.