38results about How to "To achieve the purpose of antifreeze" patented technology

The invention discloses a dual-source heat-supply water-drainage antifreezing method for construction joint of tunnel in cold area, which adopts two energy resource forms of hot gas and electric energy to carry out heat supply and water drainage at the drainage passage of the construction joint in small range; and the hot gas and the electric energy can be used independently or in combination. Based on a drainage water stopper, the method provides a dual-source heat supply pipe to carry out heat supply and thaw in small range by section and time on the construction joint of the tunnel by using two energy resources of hot air and electric energy, prevents the drainage pipeline at the construction joint from being frozen and blocked, realizes effectively drainage, thus avoiding freezing damage to the construction joint of tunnel in cold areas.

The invention provides an intelligent solar water heater and belongs to the technical field of solar heating equipment. The intelligent solar water heater comprises a water tank, a control module (6), a water return pipeline (15) and a temperature sensor (13). A water tank water outlet (9) is connected with a hot water valve (16) through a water inflow / outflow pipeline (14). The lower end of the water return pipeline (15) is arranged on the water inflow / outflow pipeline (14). The upper end of the water return pipeline (15) is connected with the water tank through a solenoid valve (12). The water tank water outlet is provided with a water pump (5). The temperature sensor (13), the water pump (5) and the solenoid valve (12) are connected with the control module (6) through control lines. The temperature sensor (13) is used for detecting the temperature of the water inflow and outflow pipeline (14) or the temperature of the water return pipeline (15). According to the intelligent solar water heater, the information of water flow and the temperature in the hot water pipeline are monitored through a water flow sensor and the temperature sensor, whether a user uses hot water or not is judged, starting or stopping of a boosting pump and the solenoid valve is controlled, and the purposes of being free of cold water, achieving boosting through hot water and preventing freezing are achieved.

The embodiment of the invention provides an antifreeze diversion device of an air cooling radiator of a natural ventilation cooling tower. Mainly, the air inlet of the air cooling radiator is horizontally or obliquely formed in the natural ventilation cooling tower, the air cooling radiator is placed on the air inlet, or the air cooling radiator and the air inlet are arranged with a certain included angle in between; the antifreeze diversion device is arranged in the air cooling radiator non-air-inlet area at the tower cylinder bottom of the natural ventilation cooling tower, and fed air at the tower cylinder bottom of the natural ventilation cooling tower is adjusted through the antifreeze diversion device. In winter, cold air can enter the cooling tower through the antifreeze diversion device without flowing through the air cooling radiator, and sucking force of the cooling tower is remarkably reduced. By means of the antifreeze diversion device, the natural ventilation sucking force of the air cooling tower can be effectively controlled, the windward air velocity of the air cooling radiator is adjusted, the risk that circulating cooling water in the air cooling radiator is frozen in winter is reduced, and the running safety and economy of an air cooling power generator set are improved.

A fuel-gas fast anti-freezing water heater with an automatic draining function comprises a shell, a water inlet pipe and a hot water outlet pipe, and also comprises a normally opened water supplying valve, a normally closed draining valve, a temperature sensor and a controlling device; the water outlet end of the water supplying valve is connected with the water inlet end of the water inlet pipe; the water inlet end of the water supplying valve is communicated with a water source; the draining valve is communicated with the water outlet end of the water supplying end; the draining end of the draining valve is provided with a draining interface; the temperature sensor is arranged in the shell; the water supplying valve, the draining valve and the temperature sensor are connected with the controlling device. As such a structure is adopted, during use, a water source switch is opened, water of the normally opened water inlet valve enters a steam connecting valve and then enters a heat releasing and exchanging device; when the external temperature is lower and achieves the freezing point, the temperature sensor sends a signal to the controlling device, the normally opened water inlet valve is closed, the normally closed draining valve is opened, rest water in a heat exchanger is drained by the water inlet pipe and the normally closed draining valve; the fuel-gas fast anti-freezing water heater with the automatic draining function can achieve the aim of anti-freezing.

The invention discloses an anti-freezing method for a cold region water conservancy project road tunnel. The method comprises: 1, building a gate slot on a road tunnel portal, and then mounting a hardrapid lifting gate in the gate slot; 2, arranging induction devices on positions in an out of the road tunnel, the distance between the position and the gate slot being a set distance, when a vehiclepasses through the induction device, the hard rapid lifting gate lifting up; 3, arranging manual buttons used to control the hard rapid lifting gate to lift in and out of the gate slot. The method isdesigned for road tunnels used in cold region water conservancy projects. When no vehicle travels, the tunnel portal is sealed by the hard rapid lifting gate, and temperature in the tunnel is greatlyincreased under the action of ground temperature, and temperature in the tunnel is closed to ground temperature, so as to ensure the back of road tunnel lining and drainage ditches not to freeze, andachieve an objective of road tunnel anti-freezing. Therefore, for road tunnels used in cold region water conservancy projects, according to the method, heat insulation boards and a deeply buried center drainage ditch used in a conventional road tunnel are not needed.

The invention provides a constant-humidity and constant-oxygen gravity all heat recovery anti-freezing fresh air unit and an air conditioner, and belongs to the field of air conditioners. The constant-humidity and constant-oxygen gravity all heat recovery anti-freezing fresh air unit comprises a heat recovery module, a humidity adjusting module, a first reheat recovery surface cooler, a second reheat recovery surface cooler, a main surface cooler, a filter module, a fan and an external cold and hot source; the first reheat recovery surface cooler, the humidity adjusting module, the main surface cooler, the second reheat recovery surface cooler, the fan and the filter module are arranged on one side of the heat recovery module in sequence; the main surface cooler is connected with the external cold and hot source; and an output end of the fan is arranged towards the filter module. Outdoor low-temperature air of a split anti-freezing gravity all heat recovery device firstly passes through a saline solution heat recovery device; fresh air recovers heat of indoor exhausted air of 20 DEG C; and outdoor fresh air is preheated and humidified, enters the saline solution for further heatingand humidification, and enters the heat supply surface cooler for heating to send into rooms, so that the air conditioner still can be started when outdoor temperature is lower than 0 DEG C.

The invention discloses a method for preparing high-strength frost-resistant concrete. The high-strength frost-resistant concrete is prepared by using acrylic acid, mercapto acetic acid, acryloyloxyethyl trimethyl ammonium chloride, ascorbic acid,allyl polyethenoxy ether, ammonium persulphate, maleic anhydride, allyl polyethylene glycol, sodium p-toluenesulfonate, methyl methacrylate, sodium methylallyl sulfonate and acrylamide, performing hydrogen peroxide alkaline treatment and doping an amphoteric dispersant and an activating agent in HZSM-5 / bentonite nano-material. The frost-resistant concrete prepared from the amphoteric dispersant and activating agent doped HZSM-5 / bentonite compound nano-material has the advantages of easily available preparation materials, low cost, strong frost resistance, good stability and long service life.

The invention discloses an anti-freezing heat exchange device which comprises a box body, a heat exchanger core body, a water inlet flute pipe, a water outlet flute pipe and a fan, wherein the heat exchanger core body is arranged in the box body and is of a copper sleeve fin-type structure; the water inlet flute pipe is connected with the water inlet end of a copper pipe of the heat exchanger core body; the water outlet flute pipe is connected with the water outlet end of the copper pipe of the heat exchanger core body; the fan is arranged on the box body, is positioned at one side of the heat exchanger core body and can blow air towards the heat exchanger core body; the water inlet flute pipe is provided with a water inlet part extending out of the box body and an air release valve; and the water outlet flute pipe is provided with a water outlet part extending out of the box body and a drain valve. The anti-freezing heat exchange device has a simple structure, is easy to implement and has a good heat exchange effect; residual water in the heat exchanger core body can be well drained; and the anti-freezing heat exchange device has a good anti-freezing function.

The invention discloses a winter anti-freezing ceiling fresh air unit system and a construction method. The inter anti-freezing ceiling fresh air unit system comprises a fresh air unit, an electric closed valve, a manual closed valve, a single-layer shutter, an iron sheet short pipe, a fireproof valve, an air pipe of the fresh air unit system, a system support hanger and a fresh air unit support hanger. The construction method sequentially comprises the following steps of: (1) measuring, and paying off; (2) installing the system support hanger; (3) installing the fresh air unit; and (4) installing the air pipe of the fresh air unit system. When the indoor and outdoor temperature difference is high, the electric closed valve is directly closed, and the manual closed valve is opened, so that the indoor air flows to the fresh air unit system through the manual closed valve under the combined action of indoor and outdoor heat pressure and air pressure to effectively prevent over low watertemperature in a copper pipe in the fresh air unit system and fulfill the anti-freezing purpose. Therefore, the indoor heat is fully utilized, and a large amount of energy can be saved under the condition of meeting the running requirement.

The invention discloses a severe cold area compressed air antifreezing method and an antifreezing device thereof. In the method, when compressed air is transported, pure alcohol is sprayed at the upstream of a transport pipeline, and the downstream of the transport pipeline is connected in series with a condensed water collector. In the antifreezing device, a quantitative regulation valve is installed at the bottom of an alcohol tank, and a wind needle type dropper is connected to the quantitative regulation valve and is inserted into a compressed air pipeline. The method utilizes a principle that the freezing point of alcoholic solution is lower than the freezing point of water to spray the pure alcohol into humid compressed air, the humidity in the compressed air gradually achieves a dewpoint to separate out the moisture, the moisture forms low concentration alcoholic solution with the alcohol together, and the low concentration alcoholic solution enters the condensed water collector and is not easy to freeze because the freezing point of the alcoholic solution is low, thereby reaching the antifreezing purpose.

The invention discloses a time-sharing anti-freezing control method of an indirect air cooling tower. The time-sharing anti-freezing control method comprises the following steps: 1, when the water discharging temperature of a sector is less than t1 DEG C or the average cooling column temperature is less than t3 DEG C, shutters of sector air cooling heat dissipation units are opened by taking the sector as a unit, and when the water discharging temperature of the sector is greater than t1 DEG C and less than t2 DEG C and the average cooling column temperature is greater than t3 DEG C and less than t4 DEG C, the shutters of the air cooling heat dissipation units of the sector are kept still, and when the outlet water temperature of the sectors is greater than t2 DEG C and the average coolingcolumn temperature is greater than t4 DEG C, the opening adjustment of the shutters of the air cooling heat dissipation units is started by taking the sectors as the unit; and 2, in the next preset time, each air cooling heat dissipation unit is taken as a unit, and when the temperature of coldest finned tubes is lower than t5 DEG C, the closing adjustment of the shutters of the air cooling heatdissipation units is started, and when the temperature of the coldest finned tubes is higher than t5 DEG C and lower than t3 DEG C, the shutters of the air cooling heat dissipation units are kept still, and when the temperature of the coldest finned tube is higher than t3 DEG C, the opening adjustment of the shutters of the air cooling heat dissipation units is started.

The invention discloses a vertical crossing type mine return air heating fresh air heat exchanger and a heat exchange method thereof, and belongs to the field of heat exchangers. The vertical crossing type mine return air heating fresh air heat exchanger comprises a heat exchanger shell, and the upper end and the lower end of the heat exchanger shell communicate with a return air inlet pipeline and a return air outlet pipeline correspondingly; the mine return air is used for directly heating the fresh air entering the well, the purpose of freezing prevention of the well shaft is achieved, waste heat in the mine return air can be effectively utilized, and under the conditions that current small and medium-sized coal-fired boilers are gradually limited to be used and natural gas supply is not stable, the mine return air is a stable and high-quality waste heat resource, and energy conservation and environmental protection are achieved. In addition, the fresh air is used for blowing a pneumatic piece imitating a butterfly wing to flap, so that a beating block impacts a vibration fork to generate vibration, vibration is generated in the heat exchange tube, condensed liquid drops in the heat exchange tube can slide down more quickly, dust brought by the fresh air can be prevented from being precipitated on the outer surface of the heat exchange tube, and the heat exchange tube is more convenient to clean. Therefore, the heat exchange coefficient can be effectively improved.

The invention discloses a cooling triangular unit with a rotating plate type flow-equalizing and anti-freezing integrated device. The cooling triangular unit comprises a cooling triangular unit body and the rotating plate type flow-equalizing and anti-freezing integrated device. The cooling triangular unit comprises a left side cooling column, a right side cooling column and an air inlet shutter. The rotating plate type flow equalizing and anti-freezing integrated device comprises a vertical rotating shaft, an upper arc-shaped sliding way, a lower arc-shaped sliding way, a vertical moving shaft and a rotating plate. According to the cooling triangular unit with the rotating plate type flow equalizing and anti-freezing integrated device, the angle between the rotating plate and the cooling column can be adjusted according to the environment wind speed and direction, and then the purposes of flow equalizing and anti-freezing are achieved. In summer, the rotating angle of the rotating plate can be adjusted so that the rotating plate can coincide with the vertical central symmetry face of the cooling triangular unit, and the flow equalizing effect on the cooling triangular unit is achieved. In winter, when the environment wind speed is large and the air inlet inclination angle is large, the rotating angle of the rotating plate can be adjusted, the environment wind is prevented from positively impacting the cooling column, and the anti-freezing effect on the cooling triangular unit is achieved.

The invention provides a high-cold area well water anti-freezing device utilizing high-pressure gas interference. The high-cold area well water anti-freezing device comprises a first high-pressure gaspipe and a second high-pressure gas pipe, wherein the top end of the second high-pressure gas pipe is connected with the transverse first high-pressure gas pipe through a pipeline connecting piece; ahigh-pressure gas pump is further installed on the ground where a well mouth of a well body is located; the high-pressure gas pump communicates with a high-pressure gas storage tank through a pipeline; a gas outlet of the high-pressure gas storage tank fixedly communicates with the gas inlet end of the first high-pressure gas pipe; the bottom end of the second high-pressure gas pipe is connectedwith a high-pressure gas valve piece through a connecting disc; and high-pressure gas generated by the high-pressure gas pump is blown into the well body through a gas valve. According to the high-cold area well water anti-freezing device, the high-pressure gas valve piece is arranged in a water-containing soil layer area in the well body of a high-cold area, the outside high-temperature and high-pressure gas is guided into the well body through the two high-pressure gas pipes, the volume of bubbles formed by the high-temperature and high-pressure gas in the rising process is rapidly expanded,so that the fluidity of well water is improved, and the anti-freezing operation of the well water in the high-cold area can be conveniently completed.

The invention relates to an antifreeze structure and an antifreeze method for a casing heat exchanger. The structure includes a refrigerant pipe, a casing, a water storage tank and a control circuit. A water heating chamber is formed, and one end of the water heating chamber communicates with the water storage tank; it is characterized in that it also includes a circulating water pump, an outdoor temperature sensor and a water level switch electrically connected to the control circuit; the circulating water pump is provided with a water inlet and a water outlet, The water inlet is respectively connected to the water inlet pipe and the water storage tank through the electric three-way regulating valve, and the water outlet is connected to the other end of the water heating chamber; the water level switch is located in the water storage tank, and the water storage capacity in the water storage tank corresponds to the height of the water level switch. Greater than or equal to the water storage capacity of the water heating chamber. The anti-freezing structure of this type of casing heat exchanger can drive the water in the water heating chamber to flow through the circulating water pump, thereby slowing down its freezing speed to a certain degree.

The invention discloses a cooling tower deicing device system which comprises a cooling tower. The top of the cooling tower is fixedly connected with a cooling fan through a fixing ribbed plate. A filling cavity is arranged inside the cooling tower. An annular water pipe is fixedly arranged below the cooling tower. The top of the annular water pipe is fixedly connected with tee joints which are annularly distributed at equal intervals. The multiple tee joints divide the annular water pipe into a plurality of sections. Vertical water pipes are arranged at the tops of the tee joints and the multiple vertical water pipes are annularly distributed outside the cooling tower at equal intervals. Hot water sprayed out of the cooling tower deicing device system forms a hot water curtain around thecooling tower, the flowing resistance of air outside the tower into the tower is increased, cold air invasion is stopped, the heat preservation condition of an air inlet is improved, the icing phenomenon at the air inlet is avoided, the effect that the hot water curtain can still be formed under the low temperature condition is guaranteed, the antifreezing purpose of the cooling tower is achieved,and meanwhile a deicing effect on the cooling tower can be achieved.

The invention relates to an antifreezing seawater chest which comprises a chest body, wherein a water inlet is formed at the bottom of the chest body, a short pipe is arranged at the water inlet, a first flange is arranged at the top of the chest body, the first flange is connected with a large cover plate, the antifreezing seawater chest further comprises a thread connecting rod and a screw rod lead seat, the screw rod lead seat penetrates through the large cover plate and stretches into the chest body, the thread connecting rod is inserted into the lead seat and is in threaded connection with the lead seat, an end plate is arranged at the lower end of the thread connecting rod, and the lower end face of the end plate is provided with a plugging piece capable of plugging the opening of the short pipe. The antifreezing seawater chest is applicable to various types of ships and has the characteristics of being antifreezing, simple in operation and easy to maintain.

The invention discloses a time-sharing antifreeze control method for an indirect air cooling tower, which comprises opening and closing the shutters of the air cooling and heat dissipation units of the sector when the outlet water temperature of the sector is less than t1°C or the average cooling column temperature is less than t3°C , when the outlet water temperature of the sector is greater than t1°C and less than t2°C and the average cooling column temperature is greater than t3°C and less than t4°C, keep the shutters of the sector air-cooling heat dissipation unit still; when the sector outlet water temperature is greater than t2°C and the average cooling column temperature is greater than t4 When the temperature is ℃, the shutters of the air-cooling heat dissipation unit are opened in units of sectors; in the next predetermined time, when the temperature of the coldest finned tube is less than t5°C, the shutters of the air-cooling heat dissipation units are opened in the next predetermined time. Close the adjustment, when the temperature of the coldest finned tube is greater than t5°C and less than t3°C, keep the louvers of the air-cooled heat dissipation unit still, and when the temperature of the coldest finned tube is greater than t3°C, open the adjustment of the louvers of the air-cooled heat dissipation unit.

The invention belongs to the technical field of fire-fighting fluids and particularly relates to an environment-friendly anti-freezing corrosion-resistant fire-fighting fluid and a preparation methodthereof. The environment-friendly anti-freezing corrosion-resistant fire-fighting fluid is prepared from, by mass, 8-50% of magnesium chloride, 6-50% of magnesium acetate, 5-15% of calcium chloride, 5% of potassium bicarbonate, 6-14% of carbamide, 0.24-0.55% of phytic acid, 0.05-0.33% of fatty alcohol polyvinyl ether, 0.05-0.31% of hexadecylamine, 0.005%-0.1% of sodium polyacrylate and 25.5-67% ofwater, wherein the sum of the mass percentages of the above components is 100%. The environment-friendly anti-freezing corrosion-resistant fire-fighting fluid can replace an electric tracer heating system, achieves the anti-freezing purpose of a water fire-fighting pipeline in winter, and simultaneously plays the good effect in reduction of the engineering cost of the electric tracer heating system and reduction of the electric energy consumption in a later period.

The embodiment of the invention discloses a heat pump control method, device and system, a storage medium and related equipment, and belongs to the technical field of heat pumps. The method comprisesthe steps that the water inlet temperature and the water outlet temperature of a heat pump are obtained; based on the water inlet temperature and the water outlet temperature, the target pipeline temperature is determined, and the target pipeline temperature is used for representing the temperature of the middle position of a pipeline of the heat pump; and the heat pump is controlled to perform anti-freezing operation based on the target pipeline temperature. Therefore, according to the embodiment of the invention, the heat pump can be controlled to perform anti-freezing operation through thetarget pipeline temperature, and the heat pump anti-freezing aim is achieved; and therefore, the technical effects of achieving accurate and real anti-freezing aims, improving the anti-freezing efficiency, saving more energy and being more effective are achieved, and then the technical problems that in the prior art, an anti-freezing control method is low in accuracy, the anti-freezing effect is poor, and power consumption is large are solved.

The invention relates to a combustion heat exchange assembly and a gas water heater. The combustion heat exchange assembly comprises a combustor body and a pot. The pot is arranged on the combustor body, so that a flame of the combustor body can directly act on the bottom wall of the pot. The pot is provided with a water outlet located at the position in contact with the bottom wall of the pot. The bottom wall of the pot is provided with multiple concave portions which are recessed from the outside face to the inside face, so that the heat exchange area of the bottom wall of the pot is increased, and the heat exchange efficiency is improved. Multiple concave portions are arranged in a spaced manner. A flow guiding passageway is formed between the concave portions on the inner side face ofthe bottom wall and communicates with the water outlet, so that water in the pot can be completely discharged from the water outlet, and the situation that when the temperature is lowered and freezinghappens, the pot is frozen to be cracked is avoided. The situation that since the concave portions are arranged to increase the heat exchange area of the bottom wall of the pot, interruption of the water flow is formed, and the water cannot be completely discharged is avoided; and in this way, the combustion heat exchange assembly can improve the heat exchange efficiency and also can achieve theanti-freezing purpose.

The invention provides a winter anti-freezing and emergency system and method used for workshop fire hoses. The system is installed in each water supply houses. The system includes a manual bypass system and an electric bypass system. The electric bypass system includes a first manual stop valve (15), a water inlet electric valve (11), a pipeline valve (12), a water outlet electric valve (13) and a first check valve (14). The manual bypass system includes a second manual globe valve (16), a second check valve (17) and a third manual check valve (18). The first manual check valve (15) is connected with a new water main pipeline and is then connected with water inlet electric valve (11), the pipeline pump (12), the water outlet electric valve (13) and the first check valve (14) successively. The second bypass check valve (16) is connected with the main water inlet pipe and is then connected with a second check valve (17) and a third manual globe valve (18) successively. The third manual globe valve (18) is connected with the main water inlet pipe of a fire hydrant.

The invention relates to an intelligent water meter, and in particular relates to an anti-freezing intelligent water meter. The technical problem is to provide the anti-freezing intelligent water meter which is convenient for people to use. The anti-freezing intelligent water meter comprises a first shell, a water meter body, a second shell, a temperature sensor, a glass plate and the like, the water meter body is arranged in the middle of the top of the first shell, the second shell is placed on the top of the first shell, the water meter body is located on the inner side of the second shell, the temperature sensor used for detecting temperature is arranged on the rear side of the top of the second shell, and a glass plate is arranged in the middle of the top of the second shell. The temperature of the external environment can be detected through the temperature sensor, when the detected temperature is lower than a rated value, electric heating iron can be controlled to start working and dissipate heat through the control module, the anti-freezing purpose is achieved, operation is easy, and use is convenient for people.

The invention discloses a dual-source heating and drainage antifreeze method for construction joints of tunnels in cold regions. Two energy sources, hot gas and electric energy, are used to supply small-scale heating and drainage to drainage channels at construction joints. The hot gas and electric energy are used alone or in combination. Based on the drainable waterstop, this method uses two energy sources, hot air and electric energy, to heat and thaw tunnel construction joints in a small area, by section and by time, by setting dual-source heat supply pipes, so as to prevent drainage at the construction joints. The channel is frozen and blocked to achieve effective drainage, thereby avoiding freezing damage in tunnel construction joints in cold regions.

The invention relates to a finned-tube bundle freezing prevention device for a direct air-cooling unit of a power station. The freezing prevention device comprises an inverted-V-shaped finned-tube bundle and an axial flow cooling fan, wherein the axial flow cooling fan is arranged just below the inverted-V-shaped finned-tube bundle through a fan bridge frame, the fan bridge frame below the inverted-V-shaped finned-tube bundle is provided with a conical support, a nylon net is sleeved on the outer side of the conical support and comprises an upper layer nylon net, a middle layer nylon net and a lower layer nylon net, and the porosities of the upper layer nylon net, the middle layer nylon net and the lower layer nylon net are reduced gradually. The finned-tube bundle freezing prevention device provided by the invention is reasonable in construction, firm in connection and easy to disassemble and assemble, can effectively improve the distribution of cold air in the air cooling unit, fulfills the purpose that the headwind speed of the finned-tube bundle is gradually reduced from top to bottom, does not completely hinder inlet air at a fan, and can effectively alleviate the situation that the middle and lower parts of the tube bundle are easy to freeze in winter and improve the security and economy of the operation of the unit.

The invention discloses a novel intelligent anti-freezing system. The novel intelligent anti-freezing system comprises a power source and a single-chip microcomputer, wherein a temperature detection switch is arranged on the single-chip microcomputer, a main valve is arranged on a main pipeline, the main pipeline communicates with at least one branch pipe, an electromagnetic valve is arranged on the branch pipe, a water outlet button is arranged at a water outlet of the branch pipe, the branch pipe communicates with a water drainage pipe, the water drainage pipe is provided with a water pump and a first electromagnetic valve, the water pump and the first electromagnetic valve are both provided with time relays, the temperature detection switch is connected with a delay switch, the pump, the first electromagnetic valve and the main valve are all connected with the delay switch, and the power source supplies power to the temperature detection switch, the water outlet button, the electromagnetic valve, the time relays, the pump, the first electromagnetic valve, the main valve and the delay switch. The device is simple in structure, high in intelligent degree, good in using effect, wide in range of application, environmentally friendly, capable of saving energy, and simple and easy in transforming original equipment.

The invention discloses a ceiling fresh air handling unit system resisting freezing in winter, which comprises a fresh air unit, an electric airtight valve, a manual airtight valve, a single-layer louver, an iron sheet short tube, a fireproof valve, an air duct of a fresh air unit system, a system supporting and hanging frame and a fresh air unit supporting and hanging frame. When the outdoor and indoor temperature difference is large, the electric airtight valve is directly closed, and the manual airtight valve is opened to ensure that indoor air flows to the fresh air unit system through the manual airtight valve under the action of indoor heat pressure, outdoor heat pressure and wind pressure so as to effectively prevent the temperature of water in a copper tube of the fresh air unit system from excessively reducing to achieve the purpose of resisting the freezing. Indoor heat is fully utilized, and a large quantity of energy sources can be saved under the condition of meeting the operating requirement.

The invention discloses an anti-freezing device for municipal trees and an installation method thereof, and relates to the field of anti-freezing of trees. The anti-freezing device is composed of an upper rain guide cover at the uppermost part, a plurality of middle protective tube shells arranged closely in the middle, and a lower rain guide cover. It is used to set the vertical cylinder on the periphery of the tree. The upper rain guide cover and the lower rain guide cover are both circular truncated structures composed of two half-arc cover shells, and the small diameter end of the upper rain guide cover faces upwards. The large-diameter end faces down, while the small-diameter end of the lower rain cover faces down and the large-diameter end faces upward. The inner surfaces of the two half-arc housings of the upper rain cover are fixedly connected with one end of the waterproof nylon strap, and the waterproof nylon The other end of the strap hangs down and out of the upper rain guide. In the present application, a waterproof nylon strap is fastened to the tree trunk in a spiral winding manner, so that the foam layer can be closely attached to the epidermis of the tree trunk, thereby achieving the purpose of anti-freezing of the tree under the condition of saving materials.

A fuel-gas fast anti-freezing water heater with an automatic draining function comprises a shell, a water inlet pipe and a hot water outlet pipe, and also comprises a normally opened water supplying valve, a normally closed draining valve, a temperature sensor and a controlling device; the water outlet end of the water supplying valve is connected with the water inlet end of the water inlet pipe; the water inlet end of the water supplying valve is communicated with a water source; the draining valve is communicated with the water outlet end of the water supplying end; the draining end of the draining valve is provided with a draining interface; the temperature sensor is arranged in the shell; the water supplying valve, the draining valve and the temperature sensor are connected with the controlling device. As such a structure is adopted, during use, a water source switch is opened, water of the normally opened water inlet valve enters a steam connecting valve and then enters a heat releasing and exchanging device; when the external temperature is lower and achieves the freezing point, the temperature sensor sends a signal to the controlling device, the normally opened water inlet valve is closed, the normally closed draining valve is opened, rest water in a heat exchanger is drained by the water inlet pipe and the normally closed draining valve; the fuel-gas fast anti-freezing water heater with the automatic draining function can achieve the aim of anti-freezing.