39results about How to "Prevent freezing and cracking" patented technology

The invention relates to an automatic control type efficient self sucking pump. The automatic control type efficient self sucking pump comprises a pump body, a motor, an automatic exhausting and vacuumizing device and an intelligent control box; a liquid inlet is formed in the bottom of the pump body and is connected to an inlet elbow, a liquid outlet is formed in the side surface of the pump body and is connected to an automatic blowoff valve, an outlet stand pipe is arranged on the top of a valve body of the automatic blowoff valve, and the bottom of the valve body of the automatic blowoff valve is connected to a return pipeline through a return valve; a rotation shaft of the motor is connected to a pump shaft through a coupling, a pump cover is arranged between the pump body and the motor, a cavity formed by the pump body and the pump cover is a pump cavity, and an impeller is arranged inside the pump cavity; the pump cover is provided with an inductive probe and a vacuumizing and exhausting hole, an exhausting pipeline is installed on the vacuumizing and exhausting hole, the automatic exhausting and vacuumizing device communicates with the pump cavity through the exhausting pipeline, and the motor, the inductive probe and the automatic exhausting and vacuumizing device are electrically connected to the intelligent control box through signal cables. The automatic control type efficient self sucking pump is simple and compact in structure, the self sucking function is realized by the automatic exhausting and vacuumizing device, and the hydraulic efficiency is high.

The invention relates to a method for manufacturing a paper water pipe. The paper water pipe comprises the following raw materials in percentage by weight: 85 to 90 percent of wood pulp paper, 8 to 10 percent of paper tube adhesive, 0.08 to 1 percent of film (PE), 1 to 1.2 percent of aluminum plating film (VMPEP) and 0.05 to 0.08 percent of film (OPE). The method comprises the following steps of: 1, slitting paper strips for later use; 2, arranging the paper strips in order; 3, sizing; 4, thermally sealing a device; and 5, rolling paper tubes. The paper water pipe has the advantages of environmental protection, corrosion resistance, rust resistance, cracking resistance in winter, long service life, light weight, convenient construction, thermal seal connection at a joint, low cost and the like.

The invention belongs to the field of electronics and control technology, specifically relates to a control method for saving energy in water circulating pump in winter. Its specific steps are that preinstall turning frequency, turning delay, the minimum and maximum limit of different temperatures pulse frequency. According to the range of temperature between outlet pipe and return pipe the energy-saving control cabinet adopts the PID algorithm to adjust pump operation frequency, when the pump operating frequency is lower than the turning frequency and the break over delay, and then pump operation frequency will be adjusted to the temperature maximum pulse frequency, and maintain a maximum delay time; pump operation frequency is higher than turning frequency and then adjusting by PID regulator; If the pump operating frequency below the turning frequency after adjustment, returning to the steps at the beginning of re-operation; if operation frequency higher than the break over frequency, entered the PID regulator. The invention adopts pulse working to prevent the water pump electricity motor works in the lower frequency limit for long hours, which cause the pipeline freezing and frost cracking because the end of pipeline can't bear under lower temperature long time and couldn't achieve consumer need. To the PWM technology application, the heating temperature is able to adjust heating temperature real-time in accordance with outdoor free air temperature.

The invention discloses an anti-freezing intelligent water meter. The anti-freezing intelligent water meter comprises a sealing pad, a first cavity, a casing, a second protecting device, a first protecting device and a water inlet pipe. By means of arrangement of the sealing pad, the sealing effect of a meter cover on the casing top and an observation window is improved, the anti-freezing and heat-insulation effects on the casing top and the observation window in frost weather are improved, and equipment practicability is improved; the anti-freezing and heat-insulation effects of inside of thecasing are realized by filling the first cavity with sponge and other heat-insulation materials, the condition of freezing of parts in the casing in frost weather is further avoided, normal use of equipment in the frost weather is guaranteed, and anti-freezing and heat-insulation performance of the equipment is improved; nesting of a water outlet pipe is realized by the second protecting device and the first protecting device, so that the protective heat-insulation effect on the water outlet pipe in the frost weather is realized, the condition of freezing in the water outlet pipe is further avoided, and the equipment practicability is improved.

The invention discloses an integrated type anti-freeze and pressure relief valve. The integrated type anti-freeze and pressure relief valve comprises a valve body 1. The valve body 1 is internally provided with a water channel 2 allowing water to flow through. An anti-freeze assembly which can block the water channel 2 is arranged on the valve body 1, and when the environment temperature is lower than the set temperature, the anti-freeze assembly automatically opens the water channel 2 to conduct water draining. Before the temperature of a water route system of a water heater reaches the critical crystallization temperature, the water route system is made in a flow state through the integrated type anti-freeze and pressure relief valve; and after a water route absorbs enough heat energy carried by flowing water and friction heat produced by relative flow, the water route system can be above a critical crystallization temperature point all the time, and freezing and frost cracking of the water route system can be prevented. The valve body 1 is further provided with a pressure relief device which can block the water channel 2, when the water pressure of the water route is higher than the set value, the pressure relief device automatically opens the water channel 2 to conduct water draining and pressure reduction, and thus, the anti-freeze and pressure relief functions are achieved at the same time; and the integrated type anti-freeze and pressure relief valve is simple in structure, safe, reliable and convenient for households to install and use.

The invention provides a strong-effect anti-cracking cable sheath and a preparing method thereof, and relates to the technical field of cable production. The cable sheath is prepared from, by weight,55-65 parts of polyethylene, 25-35 parts of epoxy resin, 12-16 parts of carbon fibers, 8-12 parts of quartz fibers, 4-8 parts of polypropylene fibers, 12-16 parts of titanium dioxide, 8-12 parts of polytetrafluoroethylene, 4-8 parts of polyimide, 2-4 parts of an anti-shrinking agent, 1-2 parts of an anti-ageing agent, 2-4 parts of an accelerating agent, 1-2 parts of a dispersing agent and 1-2 parts of a defoaming agent. According to the strong-effect anti-cracking cable sheath and the preparing method thereof, the shortcomings of the prior art are overcome, the low-temperature resistance and anti-cracking performance of the cable sheath are effectively improved, all the components in the cable sheath are jointed mutually, thus the generation and development of cracks of the cable sheath are effectively prevented, then the situation that the cable sheath is frozen and cracks, and electric leakage and other accidents are caused accordingly is prevented, and the strong-effect anti-cracking cable sheath is high in safety, excellent in performance and suitable for popularization.

The invention discloses a solar water heater device integrating the functions of automatic water loading and automatic water pipe emptying. The solar water heater device comprises a heat-insulating water tank, a temperature-regulating valve and an intelligent control instrument and a tap water pipe, wherein the heat-insulating water tank is communicated with the tap water pipe through a water service pipe; an upper emptying valve and a lower emptying valve are mounted on the water service pipe and are electrically connected with the intelligent control instrument respectively; two limber holes communicated with emptying ports are opened so as to discharge water in an upper water service chamber and a lower water service chamber through the emptying ports of the emptying valves below the upper water service chamber and the lower water service chamber, so that the frost splitting of water pipes are prevented, which guarantees the normal use of solar energy in freezing winter.

The invention provides a face rockfill dam seepage prevention structure. The face rockfill dam seepage prevention structure comprises a bed rock and a toe plate located on the bed rock. A seepage prevention layer flush with the toe plate is mounted on the downstream side of the toe plate, a rockfill material, a transition layer, a cushion material, a geomembrane and a face plate are sequentially mounted upwards from the seepage prevention layer, a construction face is mounted on the side face, facing the downstream part, of the toe plate, and the face plate, the geomembrane, the cushion material, the transition material, the rockfill material and the seepage prevention layer are in contact with the construction face. Compared with the related technology, the face rockfill dam seepage prevention structure combines advantages of a concrete face rockfill dam and a geomembrane face rockfill dam, the face plate, the geomembrane, a water stop copper sheet, the toe plate, the seepage prevention layer, a seepage prevention curtain and the bed rock form a whole seepage prevention system, whole stress performance is improved, and the dam water stop effect is ensured.

The invention relates to the technical field of gas water heaters, and discloses an anti-freezing method of a gas water heater, and the anti-freezing gas water heater. The anti-freezing method comprises the steps: the temperature of a heat exchanger in an anti-freezing mode and the environment temperature of the gas water heater are obtained; whether the temperature of the heat exchanger is lowerthan a preset first anti-freezing threshold value or not is judged; when the temperature of the heat exchanger is lower than the preset first anti-freezing threshold value, a fan is started; whether the environment temperature is larger than a preset air warming anti-freezing threshold value or nor is judged; if yes, the gas water heater enters into an air warming anti-freezing mode; and if not, acombustion device is started, and the gas water heater enters into a combustion anti-freezing mode, wherein the air warming anti-freezing threshold value is larger than the first anti-freezing threshold value. The anti-freezing method of the gas water heater, and the anti-freezing gas water heater have the beneficial effects that by adopting the fan and combustion combined anti-freezing method, icing of pipelines in the water heater can be effectively prevented, an electric heating anti-freezing device does not need to be additionally arranged, energy can be saved, and the anti-freezing costis lowered.

The invention relates to a control method for preventing failure caused by water flow loss during defrosting of a heat pump unit. The heat pump unit comprises a shell, a compressor, a four-way valve, a water side heat exchanger, an air side heat exchanger, a water outlet temperature sensor, a low-pressure pressure sensor and a refrigerant pipeline, wherein the compressor, the four-way valve, the water side heat exchanger and the air side heat exchanger are arranged in the shell, and the refrigerant pipeline communicates with the compressor, the four-way valve, the water side heat exchanger and the air side heat exchanger. The water outlet temperature sensor is arranged at the water drainage end of the water side heat exchanger. The low-pressure pressure sensor is arranged at the air return end of the compressor. The method comprises the following steps that after a defrosting mode is started, the outlet water temperature is obtained through the outlet water temperature sensor, and the low-pressure value is obtained through the low-pressure sensor; and if the outlet water temperature is larger than or equal to the preset temperature threshold value, and within the set first time range, the outlet water temperature is not in the decreasing trend, and the low-pressure value is in the decreasing trend, the defrosting mode is quitted. According to the method, the running reliability of the unit is enhanced, and the safety of the unit during defrosting is improved.

The invention provides an air inlet stop valve module, an automatic anti-freezing gas water heater and a control method of the automatic anti-freezing gas water heater, and relates to the technical field of water heaters. The valve body comprises a fluid flow channel, the fluid flow channel is provided with a first port and a second port, and the valve body is provided with a side connector; the stop block is provided with an air flow channel and is slidably connected to the side connector. The check block is in transmission connection with the driving piece, and the driving piece is used for driving the check block to slide inwards or outwards so that the check block can block or open the fluid flow channel; the fluid flow channel and the air flow channel are not communicated at the same time. The automatic anti-freezing gas water heater comprises a gas inlet stop valve module. Through the air inlet stop valve module, the situation that in the prior art, an automatic drainage anti-freezing water heater system cannot ensure that residual water in the heat exchanger is completely drained is relieved, and the technical effects that the residual water in the heat exchanger can be completely drained, and the heat exchanger is prevented from frost cracking are achieved.

The invention discloses a control method of a urea pump and an engine aftertreatment system, and relates to the technical field of engine exhaust catalytic reduction. The control method of the urea pump comprises the following steps that after a vehicle is powered off, the lowest environment temperature of the environment where the vehicle is located in the future preset time is obtained; and whether the lowest environment temperature is larger than or equal to a threshold value or not is judged, and if yes, the vehicle is stopped. According to the control method of the urea pump, when the obtained lowest environment temperature is larger than or equal to the threshold value, a connecting pipeline has no freezing risk, the urea pump is controlled to skip suck-back, and the vehicle is directly stopped. According to the control method of the urea pump, the interior of the connecting pipeline can be kept wet, and the urea crystallization risk is reduced; and the time interval from powering-off to stopping of the vehicle can be shortened, and the user experience is optimized.

The invention discloses a water meter capable of avoiding freezing cracking. The water meter is characterized in that the water meter shell comprises an inward bent part, and the inward bent part extends outwards when being frozen and extruded. According to the method and the system, the technical problem of how to prevent freezing and cracking through the change of the water meter shell is solved.