59results about How to "Sufficient service life" patented technology

The invention relates to a composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner which comprises a central wind passage, wherein a primary wind passage, an internal direct-flow secondary wind passage, an internal rotational-flow secondary wind passage and an external rotational-flow secondary wind passage are sequentially and concentrically arranged at the outer side of the central wind passage from inside to outside, a conical pulverized-coal concentrating device and a star-shaped pulverized-coal concentrating device are arranged in the primary wind passage, and a reversed V-shaped expanded opening and a zigzag axial and radial double concave-convex structured burning-stabilizing device are arranged at the outlet of the primary wind passage; and after primary wind passes through the pulverized-coal concentrating device, an intense standing-vortex burning-stabilizing firing area with obvious circumferential and radial pulverized-coal concentration distribution is formed at the outlet of the burner, and the burning conditions of high-temperature reflow smoke gas and oxygen-deficient rich fuel are generated. The burner has extremely strong firing-stabilizing performance and good coal adaptability and effectively reduces the concentration of nitrogen oxides.

The invention discloses a retaining wall reinforcement material produced by waste tires, which is as follows specifically: taking an annular rubber ring or a rubber strip formed by cutting the waste tire along the radial direction as a basic member, and mutually connecting a plurality of basic members for preparing the retaining wall reinforcement material with a net-like or a strip-shaped structure. The retaining wall reinforcement material is produced by the annular rubber rings formed by cutting the waste tires, thereby not only digesting the continuously growing waste tires, but also making full use of the difficult degradation property of waste tire materials, further leading the produced reinforcement material to have sufficient service life and truly achieving the effective utilization of wastes. The reinforcement material has the advantages that the reinforcement material can form an embedding structure with a soil body, increase the affected range of the soil body in the thickness direction and further reduce the number of set layers of the reinforcement material; the structure is simple and the production and the laying are convenient; and a three-dimensional structure which is convex at top and concave at bottom is naturally formed, thereby increasing the affected area of the soil body in the thickness direction, or automatically producing the pressure on the surrounding soil body and improving the bonding force with the soil body.

The invention discloses an exhaust pipe cabin-through structure for the top of a ship chimney. The exhaust pipe cabin-through structure comprises a slantly arranged chimney top plate, an exhaust pipe which is arranged in the middle of the chimney top plate, a fixing and reinforcing enclosing plate which is fixed on the chimney top plate, a rain shielding enclosing plate which is arranged on the fixing and reinforcing enclosing plate and a plurality of locking mechanisms by which the exhaust pipe is supported and positioned on the fixing and reinforcing enclosing plate; the rain shielding enclosing plate is fixedly connected with the upper end of the exhaust pipe; the exhaust pipe is fixed on the fixing and reinforcing enclosing plate; and after penetrating through the fixing and reinforcing enclosing plate, the lower end of the exhaust pipe is fixedly connected with an exhaust pipeline of the ship chimney through a flange at the lower end of the exhaust pipe, and the rain shielding enclosing plate covers the upper side of the fixing and reinforcing enclosing plate. The exhaust pipe cabin-through structure is simple in structure; all components are connected stably and reliably; a heat transferring area is small; the temperature of the chimney top plate is not prone to raise, the anti-corrosive paint hardly falls off, and the service life of the chimney top plate is prolonged. The exhaust pipe has enough expansion and contraction deformation space, the manufacturing and installation errors are compensated, and the whole exhaust pipe can be installed in place.

The invention discloses an oxide ceramic filter material and a preparation method. The oxide ceramic filter material comprises the following compositions by weight portion: 10 to 60 portions of CaO, 1 to 60 portions of MgO, 10 to 40 portions of SiO2, 5 to 20 portions of Al2O3, 0 to 15 portions of TiO2, 0 to 25 portions of ZnO and 0.1 to 1 portion of Fe2O3. The basic principle of the filter material is to complete the function of high-efficiency filtration by the function that adsorbed antibacterial materials subjected to physical filtration release active oxygen when reacting with water. The oxide ceramic filter material mainly aims to solve the problem of water quality deterioration caused by various pollutants in water bodies, and simultaneously has strong sterilization and algae removal properties.

A burner arrangement is provided. The burner arrangement includes a support as well as at least two fuel nozzles, with fuel nozzle tips, attached to the support in the direction of flow and a gas feed system to the fuel nozzle tips extending through the support. Each fuel nozzle includes a support-side section which on the support side includes a contact surface with which the fuel nozzle rests on a supporting surface of the support, at least two fuel nozzle tips formed in one piece running from the support-side section in the direction of flow, the gas feed system including at least one gas feed line and its lead-through through the support, the lead-through being embodied as a fit.

The invention discloses a method for preparing a carbon fiber guide wheel for cutting silicon chips and the carbon fiber guide wheel, and belongs to the field of silicon chip processing equipment. The preparation method comprises the following steps: (1) heating resin in a drying oven for 1-2 hours, adding a curing agent, and uniformly stirring in vacuum at a high speed; (2) preheating a metal core mold for 1-2 hours, and lifting the metal core mold on a three-dimensional winding machine for fixation; (3) performing a layer paving design; (4) winding to form the winding angles of carbon fiber yarns layer by layer according to a sequence from the interior to exterior; (5) performing stepped heating and cutting on the metal core mold wound with carbon fibers; and (6) accurately grinding cured carbon fiber tubes to a specified guide wheel size, and performing fixed-length cutting, so as to obtain a carbon fiber guide wheel roller. The carbon fiber guide wheel is manufactured by one-step winding, one-step curing and one-step outer surface machining, the manufacturing process is simplified, the production period is greatly shortened, and the easy layering risk due to repeated winding is reduced. Moreover, the manufactured guide wheel is high in strength, stable in quality and low in cost.

The invention discloses inorganic ceramic powder and discloses the performance of the inorganic ceramic powder for slowing hydrolyzing and releasing active oxygen when suffering from water and a preparation method thereof. Through controlling the sintering temperature and time and performing surface packaging treatment by different methods, the hydrolization process can be ensured to be performed slowly and the active oxygen can be released for a long time, thereby the application value of the powder on engineering is ensured. The release of the active oxygen can provide a powerful oxygenation mechanism for sterilizing, killing algae and lowering the pollution in water (lowering the COD index). When the powder is used for preparing various other water treatment filter materials, the range of the powder applied to the field of water treatment engineer can be expanded.

The invention provides a low-power-consumption electromagnetic flow converter mainly comprising an exciter circuit, a power source, a sensor, a signal conditioning circuit and a single-chip microcomputer interface circuit. The low-power-consumption electromagnetic flow converter is characterized in that the exciting mode of the exciter circuit is pulse rectangular wave exciting; the power source has two combination modes of lithium thionyl chloride batteries; the signal conditioning circuit comprises an instrument amplifier, a low pass filtering circuit, a resistance-capacitance coupling circuit and a high gain amplifying circuit; the single-chip microcomputer interface circuit comprises a single-chip microcomputer, a reset circuit, a crystal oscillator, an A / D input unit, a display output unit, a 485 communication output unit, a storer circuit, and a JTAG debugging interface. The low-power-consumption electromagnetic flow converter is characterized by low power consumption, small size and field display and guarantees measuring accuracy.

The invention aims to provide an adhesive which does not contain active ingredients (for example, EVA), and is high in stability, relatively long in service life and relatively great in binding force. The adhesive provided by the invention contains polyolefin-serial resin, a polystyrene-serial compound and acid modified polyethylene; the polyolefin-serial resin comprises more than any one of high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, a polyolefin elastomer and polypropylene; and the adhesive does not contain an ethylene-vinyl acetate copolymer. The adhesive provided by the invention has the beneficial effects of preventing use of necessary active ingredients (EVA) in a previous adhesive while keeping a sufficient binding force, so that the adhesive has a good binding property, an enough service life and excellent stability.

The invention discloses a preparation method and application of a carbon molecular sieve for separating olefin and alkane. The method comprises the following steps of: adding a starch carbon precursor into a distilled water solvent to prepare a starch aqueous solution, uniformly stirring and dispersing, and then carrying out medium-pressure medium-temperature hydrothermal controllable polymerization and dehydration carbonization reaction in a reaction kettle to obtain homogeneous carbonaceous microspheres; and washing and drying the obtained carbonaceous microspheres, performing controlled high-temperature defunctionalization treatment at 700-1000 DEG C in an inert atmosphere, and controlling carbon layer rearrangement and heteroatom pyrolytic reaction to obtain the carbon molecular sieve material with uniform and adjustable ultra-microporous channels. Starch biomass which is low in price, non-toxic and harmless serves as a carbon source, carbonaceous microspheres are formed through a direct hydrothermal polymerization carbonization process, the defect content and the graphitization degree of the microspheres can be controlled by adjusting the reactant concentration, the carbon molecular sieve is obtained through pyrolysis at a corresponding calcination temperature, and fine adjustment of the aperture within a sub-angstrom precision range is realized.

The invention relates to a shaft system (100) for use in a chuck (110) of a winding head (120) for winding, for example, synthetic threads, comprising at least one input or output shaft (1) and at least one axis (3) or another shaft, which (3) is arranged coaxially to the input or output shaft (1), wherein at least one of said components (1, 3) is designed as a hollow shaft or hollow axis (3) and the other component (1) is received therein at least partially and is supported with respect to the hollow shaft or hollow axis (3) by means of at least one bearing (4, 5). According to the invention, the bearing is designed as a ball roller bearing (4, 5), which is arranged radially inside on the outer circumference of the rotatable shaft (1) and radially outside on the inner circumference of the stationary axis (3).

The invention relates to a metal connecting plate (1) of a chain link of an energy chain, which metal connecting plate has two ends (2, 3), wherein one end (2) has first elements (4) and the other end (3) has second elements (5), wherein the first elements (4) can be inserted into the second elements (5) of a further connecting plate (1) in such a way that the connecting plates (1) are rotatably connected to each other. The first and second elements (4, 5) are each formed by a hole (6, 7) having a border (8, 9). The borders (8, 9) form stop surfaces (10, 11) corresponding to each other, which stop surfaces protrude substantially perpendicularly to an extent of the connecting plate (1).

The invention discloses a caterpillar band and a walking device with the caterpillar band. The caterpillar band comprises multiple forged and formed caterpillar band boards and hinge pins, wherein every two adjacent caterpillar band boards are in pivot joint through the corresponding hinge pin. Each caterpillar band board comprises two first boards and a connecting board connected with the two first boards and engaged with a gear. First pivot joint holes are formed in one side of each first board, second pivot joint holes are formed in the other side of each first board, a first pivot joint groove is formed between every two first pivot joint holes, and the interval between every two second pivot joint holes is a tooth groove where the gear is inserted. When two adjacent caterpillar band boards are in pivot joint, two corresponding second pivot joint holes are inserted in the corresponding first pivot joint groove and coaxial with the corresponding first pivot joint holes, and the twoadjacent caterpillar band boards are in pivot joint together through the first pivot joint holes and the second pivot joint holes in the two sides of the corresponding tooth groove via the corresponding hinge pins. By the adoption of the above structure, the overall structural strength of the caterpillar band can be improved, the service life of the caterpillar band can be prolonged, and the walking device with the caterpillar band can stably walk.

The invention discloses a detection device for nitrogen dioxide and a use method thereof, which belong to the field of environment detection. The device comprises a shell; an air inlet pipe is embedded in the side wall of one side of the shell; and an air extractor is arranged in the air inlet pipe. The nitrogen dioxide in the air can be detected, nitrogen dioxide is determined by using a naphthalene ethylenediamine hydrochloride spectrophotometric method, the detection result is more visual and accurate, the absorption liquid can be replaced, and therefore, the device can be repeatedly used and has enough service life; the hemispheroid shell is driven by a driving motor to rotate, the hemispherical shell is used for blowing air into the volumetric flask, the air absorption speed is increased, the reaction efficiency is improved, the pressing plate is driven to move downwards through rotation of the screw rod and limitation of the telescopic rod, the pressing plate presses a silicone tube to the bottom plate, circulation of the silicone tube is blocked, the situation that a solution is sucked back is prevented, and the whole device is simple in structure, low in cost, high in stability and capable of being repeatedly used.

A high temperature resistant guide rail roller comprises an outer ring, an inner ring, an eccentric shaft, rolling elements, a holder, a dust cap and high temperature grease, the excircle of the outer ring is arc-shaped and runs on a V-shaped guide rail, there are two effective points when the guide rail contacts with the outer ring, the inner ring is riveted to the eccentric shaft, the rolling elements are made through adopting ceramic and are spherical in shape, the holder is made through adopting high-quality brass, and each of the outer ring and the inner ring is made through a special heat treatment technology of high-quality bearing steel, so the work deformation of the guide rail roller at a high temperature of 400DEG C can be prevented, an enough service life can be guaranteed, and the guide rail roller can be applied to high temperature baking devices.

The invention provides an air conditioner system, an air conditioner and a defrosting control method of the air conditioner. The air conditioner system comprises a compressor unit, an air supply device, an indoor unit, an outdoor unit and a defrosting pipeline which communicate with one another; at least one working cavity of a plurality of working cavities of the compressor unit is provided withan air suction port and an air exhaust port, the air suction port communicates with the air supply device, and the exhaust port communicates with the indoor unit; and the first end of the defrosting pipeline communicates with the outdoor unit, the second end of the defrosting pipeline selectively communicates with at least one working cavity of the plurality of working cavities, and when the outdoor unit reaches a defrosting preset value, the defrosting pipeline is controlled to communicate with the working cavities, so that a refrigerant enters the outdoor unit through the defrosting pipelinefor defrosting operation. According to the air conditioner system, the problems that in the prior art, an air conditioner usually needs to start and stop a compressor many times to complete defrosting operation, heat is absorbed from the interior of a room, the indoor temperature is reduced, and the good user experience of a user on the air conditioner is greatly influenced are solved.

The invention relates to a composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner which comprises a central wind passage, wherein a primary wind passage, an internal direct-flow secondary wind passage, an internal rotational-flow secondary wind passage and an external rotational-flow secondary wind passage are sequentially and concentrically arranged at the outer side of the central wind passage from inside to outside, a conical pulverized-coal concentrating device and a star-shaped pulverized-coal concentrating device are arranged in the primary wind passage, and a reversed V-shaped expanded opening and a zigzag axial and radial double concave-convex structured burning-stabilizing device are arranged at the outlet of the primary wind passage; and after primary wind passes through the pulverized-coal concentrating device, an intense standing-vortex burning-stabilizing firing area with obvious circumferential and radial pulverized-coal concentration distribution is formed at the outlet of the burner, and the burning conditions of high-temperature reflow smoke gas and oxygen-deficient rich fuel are generated. The burner has extremely strong firing-stabilizing performance and good coal adaptability and effectively reduces the concentration of nitrogen oxides.

Disclosed is a valve assembly (6) for connecting a heat exchanger (1) of a hot water discharging device to a district heating system. Said valve assembly (6) comprises a valve (20) which is located on a primary side and controls a flow of heat exchange fluid through a primary side (2) of the heat exchanger (1), and a pressure-controlled valve (40) that is located on a secondary side and acts upon a flow of process water through a secondary side (3) of the heat exchanger (1). The valve (20) located on the primary side can be actuated by the valve (40) located on the secondary side. In order to simplify the production of such a valve assembly, the valve (40) that is located on the secondary side is provided with an adjustable neutral opening (44).

The invention discloses a pipe end anti-corrosive sealing structure of an anti-corrosive oil pipe. A pipe end corrosion resistant metal anti-corrosive layer is arranged on a pipe end face of a steel connecting pipe section, and an outer circle surface of the steel connecting pipe section is provided with a pipe wall corrosion resistant metal anti-corrosive layer; non-metallic anti-corrosive coatings are evenly coated on the inner hole surface of the steel oil pipe body, and the outer circle surface of the joint of the pipe wall corrosion resistant metal anti-corrosive layer of the steel connecting pipe section and the steel oil pipe body is evenly coated with the non-metallic anti-corrosive coatings. Two anti-corrosive pipe bodies are abutted and sealed through abutting the pipe end corrosion resistant metal anti-corrosive layers of two pipe bodies; for the pipe end corrosion resistant metal anti-corrosive layers are melted with the pipe end steel main body into one through laser cladding; when the pipe ends of two anti-corrosive pipes only can generate friction and wear but damage the metal anti-corrosive layer for being impacted by the rotating torque rotation torque in the course of rotating and abutting; the outer surface and the pip end of the steel connecting pipe section have the anti-corrosive performance; thus the anti-corrosive performance of the anti-corrosive oil pipe is improved, and the production cost is reduced.

The medical garbage can for storing the medical waste comprises a pedal device and a garbage can, and the garbage can comprises a can body, a sealing cover, a rotating rod, a mounting frame and an inner container. The pedal is designed on the side edge of the barrel, when waste is discarded, the user steps on the pedal laterally to avoid directly facing airflow in the barrel, the situation that medical staff are polluted by aerosol is effectively avoided, disinfectant sterilization can be automatically conducted after the waste is put in, four automatic liquid outlet heads are installed at the corners of the barrel, a pesticide spraying mechanism is connected to the pedal, and the medical staff can be conveniently and rapidly cleaned. At the moment when the cover is closed after medical wastes are discarded each time, a certain amount of disinfection liquid is automatically sprayed out from four corners in the garbage can to disinfect and kill articles in four directions, so that the condition that disinfection and killing are not thorough during subsequent centralized disinfection can be effectively prevented, and therefore, the infection to garbage placing, collecting and transferring personnel and the pollution to a site are avoided; the inner container is arranged in the barrel and can be flexibly taken out, and the situation that a barrel shell is frequently moved, damage is caused due to excessive stress, and the service life is shortened is avoided.

The invention discloses a submarine alarm whistle, wherein an inner cavity (2) is arranged in an alarm whistle body (1), an air source control valve is arranged at the lower part of the alarm whistlebody (1), an air source outlet (3) is arranged at the top of the air source control valve and communicated with the inner cavity (2), an air source inlet (4) is arranged at the bottom of the air source control valve, a valve core inside the air source control valve is positioned between the air source inlet (4) and the air source outlet (3), a valve core striking device is arranged on the air source control valve, an opening is arranged at the top of the alarm whistle body (1), a stator (5) is fixed in the opening, an air inlet (6) is arranged at the lateral side of the stator (5), a rotatingshaft (7) is arranged in the center of the stator (5), a rotor (8) is sleeved on the rotating shaft (7) and positioned in the stator (5), and a pilot seat (9) and a trumpet body (10) are arranged at the top of the stator (5) in sequence from bottom to top. The invention not only has good corrosion resistance performance, but also has low fault rate and long service life.

A circulating water tank used for washing logging rock debris comprises a sewage cavity and a clean water cavity. A plurality of vertical partition plates are arranged in the sewage cavity. Holes are formed in the tops and the bottoms of the adjacent partition plates alternately, and therefore sewage can flow forwards in the sewage cavity in a buckling mode under the action of the partition plates; the diameter of the holes formed in the bottoms is far larger than that of the holes formed in the tops; a natural sedimentation area is formed between every two adjacent partition plates; the top of the partition plate at the tail end of sewage flow is provided with the corresponding hole; after being sequentially subjected to natural sedimentation in the multiple natural sedimentation areas, the sewage enters the clean water cavity through the hole formed in the top of the partition plate at the tail end; the bottom of the sewage cavity and the bottom of the clean water cavity are both connected with a slag removing device. According to the circulating water tank, by means of the multi-stage natural sedimentation of the sewage cavity and the functions of adsorption of flocculating agents, demulsifying agents and floating oil to felt, the sewage can be cyclically used after being subjected to sedimentation stage by stage, and the utilization rate of water is greatly increased.

The invention provides an overweight glass door window pulling system based on spring counterweight. The overweight glass door window pulling system comprises a movable glass sash and moving verticalcolumns which are arranged on one side or the two sides of the movable glass sash and drive the movable glass sash to move up and down; the moving vertical columns comprise sectional material structures, a plurality of counterweight springs and spring force aggregating structures; and the elastic output end of each counterweight spring is fixedly connected to the corresponding spring force aggregating structure, and the spring force aggregating structures are vertically and slidably mounted into the sectional material structures and connected to the movable glass sash in a transmission mode. The multiple counterweight springs simultaneously share the weight of the overweight glass sash, thus gravity is dispersed, the overweight door window sash is pulled, meanwhile, the risk of sudden lowering of the glass sash due to breaking of the single spring is avoided, and thus safety is achieved; and in addition, 0.25-0.4 mm constant-force volute springs are adopted for counterweight, the needof overweight pulling is met under the premise of ensuring the adequate service life, and the advantages of high bearing capacity, safety, long service life and energy saving are achieved.

The invention relates to a high-temperature pressure sensor back-end packaging structure and a packaging method, which solves the problem that the high-temperature pressure sensor cannot work normallydue to heating failure in a high-temperature environment due to unreasonable structure under a harsh service environment. The invention comprises a cylindrical shell with a sandwich, the sandwich isfilled with a heat radiation protection material, one end of the cylindrical housing is provided with a threaded connector, The other end of the cylindrical housing is provided with a cable fixing head and a fastening nipple; a nano-porous gas gel with a conductor through hole is arranged in a cylindrical shell and the cable fixing head, the fastening nipple is encapsulated with a conductor connector extending into the conductor through hole, and the tungsten pin and the conductor bonding joint are encapsulated in the interconnecting head. The invention has the advantages of reasonable structure, good heat dissipation performance of the shell and tube, stable and reliable operation of the internal circuit protection, and meets the requirement of pressure measurement of the pressure sensorunder the high temperature environment.

The invention relates to the technical field of vehicle accessories, in particular to an vehicle rearview mirror easy to fold. The technical problem that part of existing vehicle rearview mirrors on the market are inconvenient to fold is solved. In order to solve the technical problem, the invention provides the washing machine, the invention provides an vehicle rearview mirror easy to fold. The vehicle comprises an vehicle body, fixing plates are fixedly connected to the two sides of the vehicle body, main steering plates are in lap joint with the bottoms of the fixing plates, auxiliary steering plates are in lap joint with the tops of the fixing plates, the main steering plates are fixedly connected with one sides of the auxiliary steering plates through rearview mirrors, and main steering through openings are formed in the tops of the main steering plates. In the using process, a user only needs to simply press down the pressing cover and rotate the rearview mirror to fold or storethe rearview mirror, and due to the fact that the position of the rearview mirror in the folded state and the position of the rearview mirror in the unfolded state are fixed, the situation that the position of the rearview mirror is not adjusted in place, and rear information cannot be accurately transmitted is avoided.

The invention discloses an underground structure deformation joint leaking stoppage repairing method. The underground structure deformation joint leaking stoppage repairing method comprises the following steps that 1, leveling is conducted through a fine aggregate concrete filling layer and a waterproof mortar leveling layer at a position with a height difference between a deformation joint subjected to differential settlement and structural members; 2, the fine aggregate concrete filling layer is connected with the structural members through nails; and 3, a rubber waterstop is arranged on thewaterproof mortar leveling layer. According to the underground structure deformation joint leaking stoppage repairing method, the fine aggregate concrete filling layer is used for compensating the condition that structural members on the two sides of the deformation joint are uneven due to differential settlement, and then the waterproof mortar leveling layer is used for further leveling, so thata good mounting condition is provided for the externally bonded rubber waterstop; and a pressing plate and an expansion bolt which are in contact with a water body in a structure are made of stainless steel materials, the service life of the structure is prolonged, and therefore the underground structure deformation joint leaking stoppage repairing method has enough waterproof capacity and enoughservice life, meanwhile has the characteristics of being convenient and fast to construct, simple in material and the like, and has very high practicability.

The invention discloses a solar water heater air pressure emptying freeze-proofing system mainly comprising the members of a water storage inner barrel, a heat preservation shell, a water inlet and outlet pipe, an overflow air inflation pipe, an air inflation pipe, a one-way valve, a switch valve, a pressure pump and the like. When emptying is needed, a water nozzle at the bottom end of the water inlet and outlet pipe is opened firstly, then the pressure pump is opened, compressed air enters the water inlet and outlet pipe to squeeze out water, and after the water drains away, the pressure pump is closed. When hot water is used again, the switch valve and the overflow air inflation pipe are made to communicate firstly, then the pressure pump is opened, the compressed air enters the water storage inner barrel, the hot water is squeezed out of the water inlet and outlet pipe, and the pressure pump is closed. Due to the fact that all parts except a pipeline are arranged in the heat preservation shell or indoors, the parts are not frozen A mechanical valve is adopted instead of an electric valve, so that the defect that the electric valve and a controlling circuit of the electric valve break down frequently is effectively eliminated. In addition, an air pressure pump and a controlling circuit of the air pressure pump are arranged indoors, therefore maintenance is convenient, and normal operation of the air pressure emptying freeze-proofing system can be fully guaranteed.