66results about How to "Small fluctuations in water temperature" patented technology

The invention relates to a control method for loading and load shedding of an optimized module machine system. The method comprises the steps that 1 superheated temperature ranges of different water temperature are set; 2 corresponding compressor movement judgment periods and the rate of change when a compressor conducts a loading movement and a load shedding movement are set according to the superheated temperature ranges of the different water temperature; when a machine group starts to operate, current total water inlet temperature is detected, and an actual rate of change of the water temperature is calculated; 4 the movement of one or more compressors is determined; 5 a next operating cycle is entered, and the movement moves in circles. According to the control method, the rapid water temperature rising and dropping are achieved, a target set value is obtained, the fluctuation of the water temperature in the operation process is small, the change of a user side load can be matched quickly, and the requirements of the comfort for a user and the manufacturability are met.

The invention discloses a method for heating top level of electric water heater and high speed water heater, and belongs to the field of electric water heater design technology. It is characterized in that: heater surrounding outflow tube is arranged on periphery of upper portion of the outflow tube, and when the electric water heater is in output operative mode, water body to be output at the periphery of upper portion of the outflow tube is synchronously heated, and the hot water in heat preservation state in inner liner is heated for the second time, and water temperature is enhanced, further hot water output quantity of the electric water heater is increased. The high speed water heater is characterized in that: vice heating pipe, which surrounds the outflow tube and can heat the hot water in heat preservation state in inner liner for the second time, is arranged at the periphery of upper portion of the outflow tube. The advantage of the invention includes: reasonable structure, low maintaining energy cost, high heating effective, high hot water output rate, low temperature fluctuation. The invention is especially fit for home or commercial electric water heater.

The invention discloses a control method for an air conditioner. The outlet water temperature Tewo and a set target temperature Td are acquired; a difference value delta T is calculated, wherein delta T=Tewo-Td; whether delta T is within a set difference value range or not is judged; if not, whether the water temperature change rate is within a set change rate range or not is judged; if not, whether the frequency of compressor starting / shutdown is within a set starting / shutdown frequency range or not is judged; if not, the compressor additional starting / reduction shutdown interval time is determined according to delta T, the water temperature change rate and the compressor starting / shutdown frequency, after the additional starting / reduction shutdown interval time is up, one compressor in a shutdown / start state is controlled to start / stop; and the difference value delta T, the water temperature change rate and the compressor starting / shutdown frequency are comprehensively considered, starting and stopping of compressors in a unit are controlled, and therefore frequent starting, caused by too-quick feedback of the water temperature, of the compressors is avoided, the service life of the compressors is prolonged, the water temperature fluctuation is relieved, and the requirement for comfort of a user is met.

The present invention relates to a novel plate type spiral heat exchanger, which has the characteristics of a plate heat exchanger, a spiral plate heat exchanger, and a spiral shell tube heat exchanger, and is characterized in that the size is small, the heat exchanging efficiency is high, the countercurrent heat exchange can be operated, the requirement of heat exchange in low temperature difference is met, a modular structure filter is provided, and a novel heat exchanger is easy to disassemble and clean, the present invention is easy for modularization process and assembly production, and the production cost is low. The present invention is particularly suitable for recycling of the after heat of bathing waste water and pre heating clean tap water in the process of household bathing, and more than 60 percent of waste heat can be effectively recycled, and the water heater power can be doubled in the condition of using lower cost and no energy consumption is added.

The invention discloses a control method for a cooling-water machine system, belongs to the technical field of air conditioners. The cooling-water machine system comprises a compressor unit, wherein the compressor unit comprises a variable-frequency compressor and one constant-frequency compressor or more constant-frequency compressors. The control method comprises the following steps of 1, acquiring the temperature change rate of the inflowing water temperature within a set time; 2, determining a compensation value of the working frequency of the compressor unit according to the temperature change rate; and 3, adjusting the working frequency of the variable-frequency compressor and / or the starting quantity of the constant-frequency compressors according to the compensation value. According to the embodiment of the control method, the compensation value of the working frequency of the compressors is determined according to the temperature change in certain unit time so as to control the variable-frequency compressor and the constant-frequency compressors, so that the accuracy of determining the compensation value of the working frequency of the compressors is improved, the water temperature fluctuation in the adjusting process is further reduced, and the user experience is improved. The invention further discloses a control device for the cooling-water machine system

The invention relates to a method and a device for controlling water temperature heating based on power feedback assisting. The method comprises the following steps of after starting heating, obtaining the target water temperature and real-time water temperature, and heating according to the theoretical power of the heating device; meanwhile, detecting the actual heating power of the heating device, comparing the actual heating power and the output theoretical power, and correcting the heating power of the heating device. The method has the advantages that in the heating process, the power detecting device is used for quickly detecting the power change caused by voltage sudden change, and timely feeding back to a controller, and the controller is used for making rapid response according to the current power, so as to maintain the stability of the outlet water temperature; the offset of the heater power and the change of voltage is finally represented as the change of the heater power; the technical problems of the prior art can be solved.

The invention discloses a crystallizer cooling water control system and method. The system comprises a closed-loop circulating pipeline, a heat exchange cooling pipeline and a controller, wherein theclosed-loop circulating pipeline is formed by sequentially communicating a crystallizer, a water return pipeline and a water inlet pipeline; a temperature detecting device is arranged on the water inlet pipeline; the heat exchange cooling pipeline is used for performing heat exchange with cooling water in the closed-loop circulating pipeline, and comprises a water inlet main tube, a heat exchangerand a water return main tube; a heating medium inlet and outlet of the heat exchanger is connected onto the water return pipeline; a refrigerant inlet and outlet is connected to the water inlet maintube and the water return main tube through pipelines separately; a water amount regulating valve is arranged on the water return main tube; the controller is connected to the temperature detecting device on the water inlet pipeline; and opening degree of the water amount regulating valve is automatically regulated according to the detected water temperature data. The crystallizer cooling water control system can precisely control a cooling water temperature in the closed-loop circulating pipeline to be within a range of 30-35 DEG C, guarantees hot-flow stability of the crystallizer, and guarantees surface quality of casting blank.

The invention discloses a control method of a water chiller unit. The control method is characterized in that the unit is started while Tewo is more than the sum of Tewo<d>+Td, and a running mode is selected to enter; if Tao is more than Tewo<d>-K1 and a compressor is free from fault, the unit enters a refrigerating mode; if Tao is not less than Tao<d> and is less than Tewo<d>-K1 and the compressor is free from fault, the unit enters a refrigerating and natural chilling mode; if Tao is not greater than Tao<d>-K2 or the compressor is of fault, the unit enters a complete natural chilling mode. According to the control method of the water chiller unit, the relationship among the water draining temperature Tewo, the environmental temperature Tao and the return difference temperature Td is determined, and then the running mode is selected to enter, so that the unit can be accurately controlled; the water temperature fluctuation is small, and natural chilling can be completely carried out, and as a result, the requirement of a user on water temperature can be met while energy is saved, and the use experience of the user can be improved.

The invention discloses a gas water heater. The gas water heater comprises a heat exchanger, a water mixing device, a circulating pipe, a water feeding pipe and a controller, wherein the water mixing device is connected to a water draining end of the heat exchanger; the circulating pipe is connected between a water outlet of the water mixing device and a water feeding end of the heat exchanger; and the water feeding pipe is connected to the water feeding end of the heat exchanger. The gas water heater is characterized in that the water feeding pipe is provided with a water proportional valve and a fed water temperature sensor; a detecting temperature sensor is arranged at the water draining end of the heat exchanger; and the water proportional valve, the fed water temperature sensor and the detecting temperature sensor are connected with the controller. When the gas water heater is used, overshoot heating control is facilitated, water flow in a heating process is controlled by the water proportional valve, so that the amount of fed cold water is small in a heating starting process, water can be heated to suitable temperature in a short time, water temperature fluctuation in a heating process is reduced obviously under the effect of the water mixing device, and showering comfort level is improved. The invention also provides a control method.

The invention relates to the field of water cooling system in power electronics, and more specifically relates to a novel thermal resistance and flow resistance test device for a radiator. The device comprises a device box and a pedestal, wherein a thyristor radiator press mounting piece, a water circulation system and a test and acquisition device are arranged on the device box, and a power supply device and a reservoir are arranged in the device box; the thyristor radiator press mounting piece is arranged on the device box, one end of the thyristor radiator press mounting piece is connected with the device box while the other end of the thyristor radiator press mounting piece is connected with the test and acquisition device, the test and acquisition device is connected with the reservoir through the water circulation system, and the water circulation system is arranged between the thyristor radiator press mounting piece and the test and acquisition device; and the thermal resistance and flow resistance test device can synchronously perform thermal resistance test and flow resistance test, and uses a heating block to substitute thyristor elements, so that a thermal resistance curve and a flow resistance curve of the thyristor radiator can be obtained within short time, and basis for designing a DC (direct current) transmission converter valve cooling system is provided.

The invention discloses an intelligent water temperature and quantity control device. The intelligent water temperature and quantity control device is characterized in that two water flow meters, two water temperature sensors and two electromagnetic valves are respectively mounted at a cold water pipe and a hot water pipe, received water flow signals and received water temperature signals are combined with one another by a controller, and then the controller transmits instructions by the aid of a PID (proportion, integration and differentiation) algorithm so as to accurately control on and off of the cold water electromagnetic valve and the hot water electromagnetic valve; a water temperature sensor is further mounted on a water outlet pipe of a water mixing device, and water temperature signals of water mixed by a water mixing chamber are fed to the controller. The intelligent water temperature and quantity control device has the advantages that the temperature and the quantity of water discharged by the water outlet pipe can be accurately adjusted, the total water quantity of water used during bathing can be displayed, and accordingly bathing environments required by users can be created.

The invention provides a gas valve with proportional electromagnetic valve regulation and combustor air pressure feedback regulation functions. The gas valve comprises a proportional valve and a self-suction valve. The upper end of an aluminum valve element of the proportional valve is connected with a valve clack, a valve deck is arranged at the lower end of a valve body, the periphery of a membrane is clamped between the valve body and the valve deck, the lower end of the aluminum valve element is connected with a center hole of the membrane, and the lower portion of the membrane is connected with an aluminum valve element reset mechanism; the valve deck is connected with a proportional electromagnetic valve which comprises a guide pipe, the upper portion of the guide pipe is connected with the valve deck, the lower portion of the guide pipe is connected with a lower valve base of the proportional electromagnetic valve, an exciting coil is connected to the outside of the guide pipe through a framework, a regulation movable core is assembled in the guide pipe, and a lower end cover is assembled at the inner hole in the lower section of the lower valve base; a shaft end is arranged at the lower end of the aluminum valve element and corresponds to the regulation movable core, the upper end of the regulation movable core abuts against a reset spring, the shaft end is sleeved with the reset spring, and the upper portion of the reset spring abuts against the valve deck; the lower end of the regulation movable core abuts against a pressure stabilization spring, the other end of the regulation movable core abuts against a lower end cover of the proportional electromagnetic valve, the side edge, corresponding to the pressure stabilization spring, of the lower valve base is connected with a feedback air pressure pipe joint, and the pipe joint is connected with a combustor. The gas valve is used for a gas water heater and has the advantage that output water temperature fluctuation is extremely small.

Present invention relates to a heat exchanging apparatus, especially an all natural circulation atmospheric cooling tower used for normal pressure nuclear heat supply pile. Said all natural circulation atmospheric cooling tower includes tower body, heat transfer pipe, chimney, normal pressure pile secondary loop heat tube, rising pipe, expansion box, water tank, thermal insulation blanket and fins. Said structure characteristics effectively enlarge waterside natural circulation ability and air side reasonable natural circulation ability for ensuring transferring heat quantity to atmosphere for long time.

The invention discloses a quick-heating water purifying dispenser. An electric signal output by a temperature sensing probe and an electric signal output by a flow meter are respectively transmitted to a control panel, the electric signals are sent by the control panel to a thyristor voltage regulator circuit, supply voltage is output by the thyristor voltage regulator circuit to a quick-heating heater, the preset water temperature value of an outlet of the quick-heating heater is stored in the control panel, and water flux collected by the flow meter and water temperature detected by the temperature sensing probe are processed. According to the processing results, the output voltage of the thyristor voltage regulator circuit is controlled, so that the heating power of the quick-heating heater is adjusted. According to the quick-heating water purifying dispenser, temperature on the pipeline and the water flux of the pipeline are collected at the same time, after collected data are processed, the heating power of the quick-heating heater is controlled, the heating hysteretic property is avoided, water temperature fluctuation is reduced, and resources are saved.

The invention discloses a control method and system for an open heat storage tank of an electronic closestool. The control system comprises a water tank, a water inlet valve, a water suction pump, a liquid level sensor, a heating device and a main control panel. The liquid level sensor is used for detecting the water level in the water tank, and the main control panel is used for controlling the water inlet valve, the water suction pump and the heating device to operate according to the detection result of the liquid level sensor, wherein when the liquid level sensor detects that the water level in the water tank reaches a full water level L1, the water inlet valve is controlled through the main control panel to close so that water injection to the water tank is stopped; when the liquid level sensor detects that the water level in the water tank falls to the make-up water level L2, the water inlet valve is controlled through the main control panel to open so that water is injected to the water tank; and when the liquid level sensor detects that the water level in the water tank falls to the low water level L3, the water suction pump is controlled through the main control panel to stop pumping water from the water tank. According to the control system, the service life of the heating device can be prolonged, and the water temperature fluctuation in the water tank is reduced greatly; and the user experience is improved.

The invention belongs to the field of water heaters, and particularly relates to a novel electric water heater and an implement method of modes thereof. The electric water heater comprises a horizontal clapboard and a vertical clapboard. The horizontal clapboard and the vertical clapboard divides a space in a container into an A area, a B area and a C area; a straight pipe hole is formed in the horizontal clapboard; a gap is arranged between the horizontal clapboard and a hot water pipe; the vertical clapboard is provided with a snake-shaped bending pipe; and a cross section of the straight pipe hole is larger than a cross section of the snake-shaped bending pipe. The electric water heater further comprises a reversing valve and a vent valve. When the reversing valve is in a 'shower waterreplenishing' mode, tap water and a water inlet channel of a water tank are switched on, and the vent valve on the upper end is switched off; and when the reversing valve is in a 'daily water replenishing stop' mode, the water tank and an auxiliary hot water pipe are switched on, meanwhile, the vent valve on the upper end is switched on, and the water tank communicates with atmosphere. The novel electric water heater provided by the invention has an extra function of supplying hot water in the water replenishing stop mode, and has a water tank inner structure capable of reducing water temperature fluctuations of a water outlet of the hot water pipe and realizing layering and partitioning of cold and hot water at the same time.

The invention relates to a direct-heating circulation heating pressure-bearing system, a control method thereof and a heat-pump water heater. The system comprises heat source equipment, a heating water tank and at least one heat storage water tank, wherein the heat source equipment is connected with the heat storage water tank through a direct heat pipeline and is connected with the heating watertank through a circulation pipeline, the heating water tank is used for buffering water temperature fluctuation in the heat source equipment, the heat storage water tank is connected with the heatingwater tank through a first pipeline and is connected with a tail end water system through a second pipeline and is connected with a water supply system through a third pipeline, and the second pipeline communicates with the third pipeline. According to the technical scheme, high-temperature hot water is supplied to a maximum amount through the direct-heating circulation heating pressure-bearing system, the comfort of use is guaranteed through the pressure-bearing system, meanwhile, low condensation operation is realized by adopting direct heating, so that the operation energy consumption is reduced, the heat dissipation amount of the closed type heat storage water tank is small, and the operation energy consumption is further reduced.

The invention discloses a device and method for stably adjusting the water temperature. The device comprises a water tank, a circulating water pump, a stepping proportional three-way regulating valve, a heat pump system and a control circuit. A water tank outlet communicates with a water inlet of the heat pump system through the circulating water pump, and a water outlet of the heat pump system communicates with a water inlet of the three-way valve. A second water outlet of the three-way valve communicates with the water inlet of the heat pump system through a bypass water route. A first water outlet of the three-way valve communicates with a water tank inlet. The output end of the control circuit is connected with the control end of the three-way valve. According to the device and method, the water temperature can be adjusted in real time through the bypass water route and is obtained by means of calculation according to the real-time evaporating temperature in the heat pump system, and therefore the time-lag phenomenon of calculation results can be avoided, adjustment is made after the actual outlet water temperature is calculated so that small water temperature fluctuation can be guaranteed, and stable regulation is achieved. The device and method for stably adjusting the water temperature can be widely applied to the field of heat pumps.

The invention relates to a thermostat control device and a thermostat control method. The thermostat control device comprises a sensor group, thermostat correction value calculation unit, a thermostatvoltage reference value calculation unit, a PID computation unit and a control unit, wherein the sensor group is provided with a plurality of sensors and comprises an intake air temperature sensor, avehicle speed sensor, a rotating speed sensor, a load sensor and a water temperature sensor; the thermostat correction value calculation unit is used for calculating a thermostat correction value onthe basis of the output of each of the intake air temperature sensor, the vehicle speed sensor and the rotational speed sensor correspondingly; the thermostat voltage reference value calculation unitis used for calculating a thermostat voltage reference value on the basis of the output of the rotational speed sensor and the load sensor in the sensor group and the target water temperature of cooling liquid correspondingly; the PID computation unit is used for calculating a P value, an I value and a D value through PID operation according to the current coolant water temperature output by the water temperature sensor and the target water temperature; and the control unit is used for calculating a thermostat control voltage on the basis of the thermostat correction value, the thermostat voltage reference value, the P value, the I value, and the D value correspondingly and outputting the thermostat control voltage to the thermostat.

The invention discloses a control method and a control device for a heat management module under an engine warm-up working condition, and relates to the technical field of engine cooling system control. The control method comprises the following steps of obtaining the rotating speed and the water temperature of an engine, and querying the corresponding target water temperature according to a preset engine target water temperature pulse spectrum; and judging whether the engine is in engine cool start or not according to the obtained water temperature and the queried target water temperature, ifyes, obtaining and opening the target opening degree to the heat management module through interval control, and if not, obtaining and opening the target opening degree to the heat management modulethrough PID control. According to the control method and the control device, the operating condition of the engine can be truly reflected, so that the oil consumption is reduced, and the economy of the engine is improved.

The invention provides an air conditioning system unit and an air conditioning system. The air conditioning system unit comprises a first sub-system and a second sub-system. The first sub-system comprises a first compressor, a first outdoor heat exchanger and a first indoor heat exchanger which are mutually connected to form the first compressing circulation, and a first economizer for supplying air and increasing enthalpy to the first compressor. The second sub-system comprises a second compressor, a second outdoor heat exchanger and a second indoor heat exchanger which are mutually connected to form the second compressing circulation, and a second economizer for supplying air and increasing enthalpy to the second compressor. The air conditioning system unit further comprises a first defrosting pipeline capable of optionally accessing the side road of the second economizer to the first compressing circulation so that a refrigerant of the first compressing circulation does not pass through the first indoor heat exchanger; and a second defrosting pipeline capable of optionally accessing the side road of the first economizer to the second compressing circulation so that a refrigerant of the second compressing circulation does not pass through the second indoor heat exchanger.

The invention provides a control method for an engine cooling system. The control method for the engine cooling system includes the following steps that the temperature distribution of all test pointswhen an engine is in the best state under different work conditions is calibrated and made into a MAP chart to be stored in an engine management system; the relationship of the inlet temperature andoutlet temperature of engine cooling liquid and the temperature of all the test points of the engine under a certain work condition is calibrated and made into a MAP chart to be stored in the engine management system; the relationship of the power of an electric fan, the opening degree of a thermostat, and the inlet temperature and outlet temperature of engine cooling liquid under the same work condition is calibrated and made into a MAP chart to be stored in the engine management system; the engine management system builds intelligent cooling control strategies under different work conditionsaccording to the stored MAP charts; and the engine management system controls the inlet temperature and outlet temperature of the engine cooling liquid, the power of the electronic fan and the opening degree of the thermostat according to the intelligent cooling control strategies. The control method for the engine cooling system can lower the temperature distribution and water temperature fluctuation of all the test points of the engine.

The invention relates to a cascade variable-frequency air source heat pump hot water system and an operation control method. The cascade variable-frequency air source heat pump hot water system is characterized by comprising a low-pressure-stage compressor, a heat storage heat exchanger, a first three-way valve, an evaporation-condenser, a high-pressure-stage gas-liquid separator, a high-pressure-stage compressor, a three-pipe heat exchanger, a three-way proportional regulating valve, a circulating water return temperature sensor, a circulating water outlet temperature sensor, a high-pressure-stage electronic expansion valve, a low-pressure-stage electronic expansion valve, a bypass electronic expansion valve, an outdoor environment temperature sensor, an outdoor unit fan, an outdoor unit heat exchanger, an outdoor unit heat exchanger tube temperature sensor, a second three-way valve and a low-pressure-stage gas-liquid separator. It is implemented that the cascade heat pump low-pressure stage system still operates in a forward heating mode during defrosting operation and can continuously provide heat for a heat using end, and heat supply is stable.

A heat exchanger for a gas water heater comprises a shell, a water inlet pipe and a water outlet pipe arranged on the shell, and a plurality of heat exchange plates arranged in the shell, wherein a heat exchange pipe penetrates through the heat exchange plates; the water outlet end of the heat exchange pipe is connected with the water outlet pipe; and the heat exchanger is characterized in that constant temperature pipes are arranged in the heat exchange pipe in the length direction, heat conducting mediums are hermetically arranged in the constant temperature pipes, and heat exchange areas are formed between the inner wall of the heat exchange pipe and the outer walls of the constant temperature pipes. According to the heat exchanger, the constant temperature pipes hermetically provided with the heat conducting mediums are used for carrying out heat exchange with water flowing through the heat exchange areas, so that a uniform water outlet temperature effect is realized, the water useexperience of a user is more comfortable, the constant temperature pipes do not need to be independently heated and are repeatedly used, the utilization rate is high, the energy consumption is low, and the cost is low.

The invention relates to the technical field of boilers, in particular to an electrode type hot water boiler. The electrode type hot water boiler comprises a vertically arranged barrel body and an electrode device arranged on the barrel body; an inner barrel is arranged in the barrel body; the electrode device is introduced into the inner barrel from the barrel body; the inner barrel and the barrel body are arranged in an insulated manner; and two water returning pipes and three water discharging pipes are arranged at the bottom of the inner barrel. The problem that a current boiler shell is powered on, and overall insulation is needed is solved, and the effects that the water outflow temperature is stable, and water temperature fluctuation is small can be achieved. In the process of providing hot water circulation, and water for use is relatively little.

The invention relates to an enhanced vapor injection variable-frequency air source heat pump hot water system and an operation control method. The enhanced vapor injection variable-frequency air source heat pump hot water system is characterized by comprising a compressor, a heat storage heat exchanger, a bypass electronic expansion valve, a refrigerant-water heat exchanger, a three-way proportional regulating valve, a circulating water return temperature sensor, a circulating water outlet temperature sensor, an air injection electronic expansion valve, an economizer, a main electronic expansion valve, an outdoor environment temperature sensor, an outdoor unit fan, an outdoor unit heat exchanger, an outdoor unit heat exchanger tube temperature sensor, a three-way valve, and a gas-liquid separator. The enhanced vapor injection heat pump hot water system is still in forward heating operation during defrosting operation and can continuously provide heat for a heat using end, and heat supply is stable.

The invention discloses a thermostat, a thermostat control method and an engine cooling system. The thermostat comprises two outer supports and a temperature sensing sensor set, a shell is arranged at the bottoms of the opposite sides of the two outer supports, an outer shell is arranged in a cavity formed by the shell and the outer supports, a temperature sensing medium is arranged in an inner cavity of the outer shell, a push rod is arranged in an inner cavity of the temperature sensing medium, the bottom of the push rod penetrates through the inner cavity of the outer shell and extends to the outside of the shell, and the bottom of the push rod is fixedly connected with electric control equipment. According to the thermostat control method, the water temperature of an engine can be stably controlled, the actual water temperature fluctuation is small, the stable state is basically achieved, the actual water temperature and the target water temperature are kept roughly consistent, meanwhile, in the fault detection process, fault misjudgment is effectively avoided, the fault analysis and diagnosis rate is increased, and then the normal operation of a vehicle is effectively ensured.

The invention discloses a gas water heater and a control method thereof, and the gas water heater is provided with a gas inlet, a water inlet and a water outlet and comprises a combustion system, a circulating water path, a working water path and a second heat exchanger, and the combustion system is communicated with the gas inlet. A circulating pump, a first heat exchanger and a buffer tank are arranged on the circulating water path, and heat exchange between the circulating water path and the combustion system is achieved through the heat exchange device. The working water path is respectively communicated with the water inlet and the water outlet. The second heat exchanger is connected with the circulating water path and the working water path so as to achieve heat exchange between the circulating water path and the working water path. The gas water heater is high in energy utilization rate, long in service life and high in comfort and safety.

The invention discloses a control method for a central air conditioning system, and belongs to the technical field of air conditioning. The central air system comprises an indoor unit and an outdoor unit, wherein the outdoor unit comprises a cold water unit which is composed of one or more variable frequency compressors and one or more constant frequency compressors. The control method comprises the steps of acquiring the current water inlet temperature Tn and the water inlet temperature Tn-1 obtained at the last time; determining the compensation value of the working frequency of the cold water unit according to the Tn and the Tn-1; and adjusting the working frequencies of the variable frequency compressors according to the compensation value and / or the starting quantity of the constant frequency compressors. The invention further discloses a control device for the central air conditioning system. According to the control method and device for the central air conditioning system, theproblem that the whole machine is started in the process of adjusting the cold water unit is solved, water temperature fluctuation is reduced, and user experience is improved.

The invention discloses a capacitive coupler pouring mold with a rapid cooling function, and relates to the technical field of pouring molds. The capacitive coupler pouring mold with the rapid cooling function comprises an operation box, a bearing top plate is fixedly installed at the top of the operation box, an adjusting mechanism is arranged on the operation box, a cooling mechanism and a pouring mechanism are arranged on the bearing top plate, a mold is arranged on the adjusting mechanism, and the bottom of the inner side of the operation box is fixedly connected with a cooling fin plate and a drainage pipe. By combining the characteristics that water circulation can be repeatedly and cyclically utilized, resources are saved, and water temperature fluctuation is small, a cooling device which can conduct water spraying cooling through an atomization spray head and can complete water circulation through a water pump and a long water pumping pipe is designed, through the design of a condensation pipe, the outer wall of the long water pumping pipe can be cooled, circulating water cooling is accelerated, and therefore the aim of rapid cooling is achieved, and cooling of the pouring mold is accelerated.