387results about How to "Solve the cooling effect" patented technology

The invention discloses a frequency increasing method and system for a variable frequency air conditioner. The frequency increasing method comprises the steps that the environment temperature of the environment where the variable frequency air conditioner is located and the set temperature set by a user are acquired; whether an absolute value of a difference value between the environment temperature and the set temperature is larger than a temperature threshold value is judged; if yes, the first frequency increasing speed of a compressor is calculated through a fuzzy control algorithm according to the environment temperature and the compressor current, and the operation frequency of the compressor is increased according to the first frequency increasing speed; if not, the operation frequency of the compressor is increased according to the preset second frequency increasing speed; the first frequency increasing speed is higher than or equal to the second frequency increasing speed. According to the frequency increasing method and system, the frequency increasing speed of the compressor can be quickly increased to achieve the purpose of quick refrigerating or heating, and therefore great convenience is brought to a user.

The invention discloses an energy efficiency controlling method for a refrigerating system. The method comprises the following steps of: initializing the refrigerating system, and starting an automatic analysis operation mode according to the preset interval time; acquiring the operating parameter of each refrigerating host in real time, calculating the operating parameter when the energy efficiency of each refrigerating host or a cooling tower is optimal, and displaying the optimal value of the operating parameter on a monitoring interface of a work station; controlling a controller to regulate the operating parameter according to the optimal value by the work station, so that the energy efficiency of each refrigerating host is optimal; controlling the refrigerating system by a one-by-one increment / reduction method, so that the energy efficiency of the refrigerating system is highest; and maintaining the optimal value of the operating parameter to operate the refrigerating system, and closing the automatic analysis operation mode till the next automatic analysis operation mode is started. By the method, automatic regulation of the energy efficiency of the refrigerating system and group control of a refrigerating unit can be realized.

The invention relates to a split type water-cooling air conditioner fan device, comprising a cooler arranged outside, an indoor heat exchanger and a water pipe connecting the cooler and heat exchanger; wherein the cooler is a water vapour heat sink and comprises a shell and a fan assembly, a control device, a water curtain, a water tank and a water channel which are arranged in the shell; the water pipe comprises a low temperature water pipe and a high temperature water pipe, the low temperature water pipe is connected with the inlet of the heat exchanger and the outlet of the water tank of the cooler, and the high temperature is connected with the outlet of the heat exchanger and the inlet of the water channel of the cooler; and the indoor heat exchanger is a gas-liquid heat exchanger. The invention also relates to a cooling method of the split type water cooling air conditioner fan device. The air conditioner device not only can maintain indoor absolute humidity when in use but alsohas favourable heat sink and cooling effect and has the advantages of high working efficiency, energy conservation and wide application, and effect of mid refrigeration and temperature reduction without humidifying can be achieved even in damp area.

An optical adjusting mount capable of movably processing all-solid-state high power lasers comprises a frame, a support and a fine adjustment screw pair, wherein a lens hole of the frame is internally equipped with a baffle ring, a retainer ring is disposed on the front of the baffle ring, four tension spring holes are positioned on the frame, the back face of the frame is equipped with a V-type groove, a concave groove and a ball tapered-groove, the side face of the frame is equipped with a cooling water inlet and an outlet, the support is equipped with four tension spring holes, two holes for the fine adjustment screw pair and a ball tapered-groove which correspond to the frame, the frame and the support are connected through tension springs, each of the ball tapered-grooves of the frame and the support are inlaid with a ball, the fine adjustment screw pair is respectively mounted in the two holes for the fine adjustment screw pair of the support, the front ends of the fine adjustment screw pair are respectively located in the V-type groove and the groove. The optical adjusting mount has the advantages of scientific reasonable design, compact structure, low material consumption and low cost, further utilizes the baffle ring made of low-hardness fine heat conductivity red copper to press the lens on the end face, thereby effectively reducing the lens temperature, and utilizes the V-type groove and the ball for positioning, thereby realizing stable and reliable groove limiting.

The invention discloses an energy-saving air-conditioning / hot water triple-supply system, comprising a compressor (1), a hot water heat exchanger (4), an air heat exchanger (6), an air conditioning heat exchanger (10) and other parts; using main components of a heat pump system, the system adopts a structure with three heat exchangers interconnected in a mixed manner and double four-way reversing valves and has four working modes including refrigeration and water heating, water heating, heating and water heating, and defrosting, thus the triple supply of refrigeration, heating and clean hot water can be realized; the system has high heat exchange efficiency and simultaneously enhances energy efficiency ratio of system as well; by adopting the heat pipe exchangers, the system solves the problem that the heat exchanger is liable to leakage so as to pollute water, and overcomes the deficiency of large resistance when a plurality of heat exchangers are connected with each other in series.

The invention relates to a coaxial partition high-temperature-rise combustor head which comprises a first-stage axial hydrocyclone (31), a venturi (32), a main-stage fuel oil way (33), a second-stageaxial hydrocyclone (34), a baffling device (35), a three-stage axial hydrocyclone (36) and a splash pan (37). A middle cooling runner (41) is formed between the venturi (32) and the main-stage fuel oil way (33), an expansion section of the venturi (32) is provided with a plurality of rows of cooling small holes (42), part of air flowing into the middle cooling runner (41) flows out from the cooling small holes (42) in the expansion section of the venturi (32), the other part of air flows through the periphery of a main spraying opening (43) in the tail end of the main-stage fuel oil way (33) to flow out from a main-stage fuel oil atomization channel (44).

The invention provides a 3D printer head for solving the problems that the 3D printer head in the prior art has a complex structure, is easy to cause material blockage and leakage and has poor cooling effect. The 3D printer head comprises an extruding part, a ventilation part, a heating part and a line outgoing part, wherein the line outgoing part comprises a fixed base and a line bank, the line bank is arranged at the rear end of the fixed base, and the extruding part, a ventilation part and the heating part are all arranged on the fixed base; the ventilation part adopts an interior-drafting type axial fan, air blown by the interior-drafting type axial fan is enabled to flow into a stepping motor at the extruding part, so as to lower the temperature of the stepping motor, ensure the stepping motor to work normally and prolong the life of the stepping motor; besides, downward airflows can directly cool the 3D printer head during printing, use of double fans is avoided; the design of the ventilating channel can effectively reduce the volume and the weight of the 3D printer head.

The invention discloses a built-in electromagnetic heating roll. An electromagnetic coil is fixed on a barrel-shaped substrate; the electromagnetic coil is electrified by a power supply plate; a right rotating connector is fixed in a central through hole of a right roll shaft; a positive wire and a negative wire of a power supply are fixed on the right rotating connector respectively; a positive elastic electric brush and a negative elastic electric brush are fixed on the right rotating connector; the positive elastic electric brush and the negative elastic electric brush are electrically connected with the positive wire and the negative wire of the power supply respectively; the positive elastic electric brush and the negative elastic electric brush are electrically in elastic contact with a positive contact plate and a negative contact plate respectively; two semicircular insulating heat-isolating bush sheets are buckled on the substrate and press the electromagnetic coil; ventilating slots are formed on the insulating heat-isolating bush sheets; the ventilating slots are communicated with ventilating passages which are formed on a left roll shaft and the right roll shaft; and the two ends of the substrate are fixed on the left roll shaft and the right roll shaft. The built-in electromagnetic heating roll is uniform in surface temperature, low in energy waste and low in electricity consumption.

The invention discloses an air conditioning system and a refrigerant heat dissipation device and method thereof. The refrigerant heat dissipation device comprises a refrigerant heat exchanger used fordissipating heat of a part to be subjected to heat dissipation, a first refrigerant pipeline which is used for conveying the refrigerant split from an refrigeration system of the air conditioning system to the refrigerant heat exchanger, a second refrigerant pipeline which is used for conveying the refrigerant flowing out of the refrigerant heat exchanger to the refrigeration system, a first control valve arranged on the first refrigerant pipeline, a second control valve arranged on the second refrigerant pipeline, a first temperature detection unit which is used for detecting refrigerant temperature of a first port of the refrigerant heat exchanger, a second temperature detection unit which is used for detecting the temperature of the part to be subjected to heat dissipation, a control unit which is used for adjusting an opening degree of the first control valve according to the refrigerant temperature of the first port of the refrigerant heat exchanger, and adjusting the opening degree of the second control valve according to the refrigerant temperature of the first port of the refrigerant heat exchanger and the temperature of the part to be subjected to heat dissipation. The refrigerant heat dissipation device has the advantages that the problems of condensation and insufficient cooling capacity can be solved.

The invention discloses a 12-cylinder water cooling diesel engine. The engine comprises a crank connecting rod mechanism arranged on a fixed part, a gas distribution mechanism, a transmission mechanism, a cooling system, a lubricating system, a fuel supply system, an intake / exhaust system, an electric system and a starting mechanism. The water cooling engine widens the power range, increases the power from traditional 195-499 kW to 780 kW, preferably exerts the characteristics of high power, small size, compact structure and low fuel consumption of the series of diesel engines, adapts to the market demands, satisfies the use requirements of users, is better in market competitiveness, can be applied to such fields as engineering machinery and generator sets, and widens the application field of 132-series engines.

The invention provides a solar energy storage heat pump air conditioning system on the basis of solution. The invention is a new heat pump air conditioning system which performs the heat humidity independent processes in summer, absorbs the heat from the air with the help of the solution in winter, realizes the functions of cooling and heating and takes full advantages of the solar energy and is capable of storing the energy. The system comprises a solution part, a hot and cold water part and an air processing part and mainly comprises a hot and cold water machine set, a cooling tower, a dilute solution reservoir, a concentrated solution reservoir, a solution regenerator, a solar thermal collector, a dehumidifier, a superheater and a surface air cooler. When the heating mode is run in winter, the air source is taken as the heat quantity source of the heat pump on the basis of the solution, thereby thoroughly solving the frosting problem when the heating mode of the prior air source heat pump runs in winter, improving the performance coefficient of the heat pump; meanwhile, the solar energy is taken as the heat quantity source of the heat pump system, thereby realizing the solar energy storage on the basis of the solution and solving the unstable problem of the solar energy.

The invention provides an air conditioner and a control method and system thereof. The control method includes allowing an ultrasonic sensor to detect a distance from an obstacle to the air conditioner; according to the distance detected, determining operating parameters of the air conditioner to allow the air conditioner to operate according to the operating parameters determined. According to the technical scheme, measures such as longer air supply time and bigger wind force are taken for the obstacle farther away from the air conditioner so that ensured is that hot air or cold air supplied by swing blades of the air conditioner is more evenly distributed to a whole room; the problem that the prior air conditioner has uneven refrigerating and heating action on multiple areas of the room is solved; comfort level is increased for users.

The invention discloses a method and a device for cooling and heating a power cell of an electric automobile based on phase-change slurry circulation. A phase-change material is subjected to micro-nano capsule encapsulation, and then, is prepared into phase-change slurry together with a liquid solvent; the phase-change slurry is subjected to heat exchange closed circulation between a power cell encapsulating chamber and an air conditioner compartment chamber of the electric automobile; and the transfer beneficial flowage of heat between the cell encapsulating chamber and the air conditioner compartment chamber is achieved by utilizing the heat absorption or the heat release phenomenon of the phase-change material occurring in a heat exchange solid-liquid phase-change process. The method and the device for cooling and heating the power cell of the electric automobile are the temperature control and the heat management techniques of the power cell of the electric automobile, and the cooling problem in the condition of a high-temperature climate (an ambient temperature is more than 40 DEG C) and the heating problem in the condition of a low-temperature climate (the ambient temperature is less than 0 DEG C) for the power cell of the electric automobile can be effectively solved.

The invention discloses a special environment-friendly complete-synthesis cutting fluid for drilling stainless steel and a preparation method thereof. The preparation method comprises the following steps: mixing and stirring 10 to 15 percent of extreme-pressure lubricant, 3 to 5 percent of hydroxylation sulfonation castor oil borate and water for 10 minutes to 1 hour at the temperature of 30 to 80 DEG C to obtain a mixed component A; mixing and stirring 5 to 15 percent of pH stabilizer, 5 to 8 percent of antirust agent and water for 10 minutes to 1 hour at the temperature of 30 to 80 DEG C to obtain a mixed component B; uniformly mixing and stirring 15 to 25 percent of surface active agent and 3 to 5 percent of coupling agent at the normal temperature and normal pressure to obtain a mixture component C; adding the mixed component A, the mixed component B and the mixed component C into a reaction kettle and stirring and mixing for 10 minutes to 1 hour at the temperature of 30 to 80 DEG C to obtain the product. The prepared product is good in lubricating property, washing property, antirust property and cooling property, long in service life and environment-friendly.

The invention belongs to the field of aeroengines and mainly relates to a partial pre-mixing and pre-evaporation burning chamber with a prefilm type nozzle. The head of the burning chamber consists of an auxiliary burning level and a main burning level, wherein the auxiliary burning level comprises a primary axial swirler, a contraction section, a throat, an expansion section and an auxiliary oilway nozzle; and the main burning level comprises a primary axial swirler, a primary radial swirler, a pre-mixing section, a contraction throat and the prefilm type nozzle. The burning chamber at the head in the above structure adopts a DIPME (direct injection pre-mixing and pre-evaporation) mixed burning mode with central classification, when in small fire state, the auxiliary burning level adopts a rich oil direct injection burning mode, and when in large fire state, the auxiliary burning level adopts a lean oil direct injection burning mode, and the main burning level adopts a lean oil partial pre-mixing and pre-evaporation burning mode. In order to guaranteeing fuel oil atomization, the main burning level adopts the prefilm type nozzle. The head of the burning chamber can guarantee performance of the burning chamber, and pollutant discharge is greatly reduced.

The invention discloses a direct fluid-solid coupling heat transfer analysis method for an engine cooling water jacket. The method comprises the following steps: 1, establishing a solid domain and a fluid domain parametric geometric model; 2, carrying out grid partition and grid quality inspection; 3, defining material attributes; 4, defining boundary conditions; 5, defining a coupling heat transfer interface; 6, setting solver parameters; 7, carrying out direct fluid-solid coupling heat transfer analysis considering boiling heat transfer and obtaining calculation results. The method can compensate for the inability to effectively evaluate the heat transfer process and the coolant flow condition between the solid region and the fluid region in a conventional engine cooling water jacket design process, and the method avoids the risk of cracking failure caused by the high temperature of the bridge area of the cylinder head fire surface.

The invention provides an FHM-based cold-rolling mill working roll emulsion sectional cooling control method. The method comprises determining the amount of nozzles covering strip steel and sequentially numbering the controllable nozzles; establishing fuzzy inference rules of an FHM-based cold-rolling mill working roll emulsion sectional cooling system; defining generalized input variables for the fuzzy inference rules and obtaining the fuzzy membership functions of fuzzy sets corresponding to the generalized input variables; by means of the obtained fuzzy inference rules, the obtained generalized input variables and the obtained fuzzy membership functions of the fuzzy sets, calculating out the spraying flow adjusting amount of an i-th nozzle at a current time to obtain an emulsion spraying flow adjusting amount calculation model of a controllable nozzle to achieve the flow control valve online control of the sectional cooling controllable nozzle. According to the FHM-based cold-rolling mill working roll emulsion sectional cooling control method, by establishing the physical relationship between plate shape deviation and the emulsion spraying flow adjusting amount of the controllable nozzle at the current time, the emulsion spraying flow adjusting amount calculation model of the controllable nozzle can be obtained and meanwhile the precise online control of cold-rolling mill working roll emulsion sectional cooling can be achieved.

The invention discloses a preparation method for a composite yarn with a radiation refrigeration function, and a fabric. The preparation method for the composite yarn with the radiation refrigerationfunction, and the fabric comprises the following steps: preparing a cold-sense non-woven fabric strip; preparing a non-woven fabric strip fully attached with micro-nano particles; preparing a composite fiber strip from the cold-sense non-woven fabric strip and the non-woven fabric strip fully attached with the micro-nano particles; preparing a composite yarn core from the composite fiber strip; carrying out forming processing on the composite yarn core to form the composite yarn; and preparing the fabric from the composite yarn. According to the preparation method for the composite yarn with the radiation refrigeration function, and the fabric, the inorganic micro-nano particles with a concentration which is adjustable in a large range are introduced outside and inside the yarn by virtue of a padding method and a coating method, and the radiation-refrigeration composite yarn appliable to cooling for human skin, and the fabric are prepared; and the preparation method is simple and shortin flow, and solves the problems of inapplicability to cooling for human skin, complex process, difficulty of being subjected to textile processing, and poor refrigeration effect of an existing radiation-refrigeration material.

The invention provides an iron ore pre-reduction sintering method. The method comprises the steps that firstly, a traditional mixture is prepared, iron ore powder, a solvent and fuel are subjected to raw material matching, mixing and granulating are conducted, and the traditional mixture is obtained; secondly, a pre-reduction mixture is prepared, after the iron ore powder, an additive and the fuel are evenly mixed, pelleting is conducted, carbon-burdened pellets are obtained and placed in a cylinder mixer, fuel fine powder and quick lime or slaked lime are added for wrapping and granulating, and the pre-reduction mixture is obtained; thirdly, material distribution is conducted, a double-layer material distribution manner is adopted, the pre-reduction mixer prepared in the second step is placed on a sintering machine trolley in advance, and the traditional mixture prepared in the first step is placed on the pre-reduction mixture; and fourthly, sintering is conducted, ignition is conducted, and the traditional mixture and the pre-reduction mixture are subjected to smoke circulation type sintering on a sintering machine. The problem that CO smoke is hard to treat is solved, secondary oxidization in the pre-reduction sinter reducing process is reduced, the combustion atmosphere between material layers is improved, the material temperature is increased, and generation of the iron ore material reducing reaction is accelerated.

The invention provides a mask device capable of being used through cold application and hot application, belongs to the technical field of daily necessities, and solves the technical problems that the conventional mask is simplex in using function and the like. The mask device comprises a mask patch, and further comprises a circulating water supply mechanism and a semiconductor cooling chip which is provided with heating or cooling functions after being electrified, wherein a water passage is arranged inside the mask patch; a water inlet and a water outlet are formed in the two ends of the water passage; the circulating water supply mechanism is communicated with the water inlet and the water outlet respectively; the semiconductor cooling chip is in contact with the circulating water supply mechanism and can heat or cool liquid in the circulating water supply mechanism. The water passage is formed inside the mask patch, the circulating water supply mechanism circularly supplies water to the water passage, and the mask patch is heated or cooled by virtue of bi-directional heating and cooling functions of the semiconductor cooling chip, so that the technical problem of how to enable the mask device to have both cooling and heating functions is solved.

The invention relates to a concrete diameter construction survey control method for a cooling tower and a large-scale construction barrel. The method comprises the following steps: on the basis of utilizing the projection of the center of the barrel on a plane as a circle center, dividing a circle into N equal parts according to the number N of creeping formwork guide rails and utilizing ink lines and red paint to mark on a bottom plate so as to serve as radial lines, wherein the central lines of the creeping formwork guide rails are corresponding to the radial lines; erecting a total station at the circle center, reading the distance L1 between the circle center and the reference point of an erected optical plummet along the radial lines, and reading the reading L2 of an organic glass measuring scale protruded from the inner edge of the creeping formwork guide rail on a barrel wall, wherein the inner radius R inner of the barrel wall is equal to the sum of L1 and L2; checking whether R inner is equal to R or not, if deviation exists, regulating the creeping formwork guide rails until the R inner is equal to R; utilizing a same method to determine the radius of each section of the barrel; and controlling the concrete radius of the barrel according to the condition that the sum of the inner radius of the barrel wall and the thickness of the barrel wall is equal to the outer radius of the barrel wall. The method provided by the invention is safe and reliable, is simple in operation and high in precision, and can be used for greatly reducing the labour intensity of measurement personnel and improving the measurement efficiency.

The invention provides a hybrid energy heating and refrigerating system. The hybrid energy heating and refrigerating system comprises a valley electricity boiler, a solar photovoltaic power generation module board, an energy storage water tank, a flat-plate solar collector, an air energy heat pump with a heating function and a refrigerating function, a remote intelligent control system, a domestic hot water bath system and a water pipe system. The remote intelligent control system controls the valley electricity boiler, the solar photovoltaic power generation module board, the energy storage water tank, the flat-plate solar collector, the air energy heat pump, the domestic hot water bath system and the water pipe system. The valley electricity boiler heats water connected to the water pipe system through solar energy at a second time period. The air energy heat pump heats the water connected to the water pipe system through air energy at a third time period. The air energy heat pump adopts heat energy generated by the flat-plate solar collector as a low-temperature heat source at an overlapped time period between the second time period and the third time period.

The invention discloses a test device for the service life of an aircraft alternating current generator fuel oil and slide oil radiator. The test device for the service life of the aircraft alternating current generator fuel oil and slide oil radiator comprises a slide oil side normal temperature system, a slide oil side high temperature system, a fuel oil side normal temperature system, a fuel oil side high temperature system, a refrigeration system, an automatic control system and an environment cabin. According to the technical scheme, a plurality of fuel oil and slide oil radiator bodies can be subjected to cyclic fatigue tests of flow rate, pressure, temperature and ambient temperature; under the test system, high-temperature, high-pressure and large-flow slide oil is introduced intoa product; after test conditions are stable, the automatic control system is used for automatically switching, and low-temperature, low-pressure and small-flow slide oil is introduced into the product, therefore, the impact of oil flow rate, pressure and temperature can be verified to simulate the influence of oil flow rate, pressure, temperature and environment temperature of an aircraft on the service life of the product. The test flow rate, pressure and temperature are automatically detected, adjusted, collected and recorded by the automatic control system for each detection point on a pipeline, and feedback control and data recording are carried out through the collection parameters of each detection point.

The invention discloses a thermoforming profile-followed waterway mold and a machining method thereof. The machining method comprises the steps that 1, a mold model of the thermoforming profile-followed waterway mold is designed through 3D drawing software, the molded surface of the mold is adjusted, and the thermoforming profile-followed waterway mold comprises a base body insert and a cooling insert mounted on the base body insert and provided with a profile-followed waterway; 2, the base body insert is pre-heated and subjected to surface oil removing and dust removing treatment; 3, the cooling insert provided with the profile-followed waterway is printed on the base body insert through 3D printing equipment; and 4, the printed cooling insert is subjected to finish machining treatment. According to the thermoforming profile-followed waterway mold and the machining method thereof, only the cooling insert is formed through a 3D printing technology, in this way, the using amount of printing powder can be decreased in quantity, meanwhile, the thermoforming profile-followed waterway mold after 3D printing forming does not need to be subjected to heat treatment, the mold cost is saved,the 3D printing time is reduced, and the production efficiency is improved; and the thermoforming profile-followed waterway mold and the machining method thereof have the advantages of high cooling efficiency and good uniformity of the mold surface temperature.

The invention discloses a low-temperature non-invasive limb trauma protection device for the emergency department, aiming at solving the problems that medical personnel are occupied due to pressing ice bags for ice compress all the time during transfer of a patient with limb traumas, and cooling effect is not good enough. The low-temperature non-invasive limb trauma protection device for the emergency department comprises a water tank fixed on a base, a holding block and a water pump, wherein the water pump is positioned between the water tank and the holding block, the holding block hinges toa limiting block, and arc-shaped holding grooves are formed in the opposite sides of the holding block and the limiting block. With the limiting block, magnets, the holding block, the water tank, a driving motor, a rotating rod, fan blades, cutting blades, the water pump, a water guide pipe and water bags, the low-temperature non-invasive limb trauma protection device for the emergency departmentcan cool injured parts of the patient rapidly and effectively without occupying the medical personnel for pressing the ice bags for ice compress.

The invention provides a control method for a double-throughflow air conditioner. The control method comprises a detection step, a judgment step and a control step. The detection step is used for detecting indoor environment temperature t and for detecting whether the double-throughflow air conditioner is in a refrigeration mode or a heating mode. The judgment step is used for judging whether theindoor environment temperature t and a preset temperature value T0 meet the relation that t1 error<|t-T0|<=t2 error after the air conditioner is started for preset time. According to the control step,when t1 error<|t-T0|<=t2 error, the rotation speed N1 of a first motor is controlled to be N1max, the rotation speed N2 of a second motor is controlled to be N2min, or the rotation speed N1 of the first motor is controlled to be N1min, the rotation speed N2 of the second motor is controlled to be N2max, wherein N1max is the preset maximum rotation speed of the first motor, N2max is the preset maximum rotation speed of the second motor, N1min is the preset minimum rotation speed of the first motor, and N2min is the preset minimum rotation speed of the second motor. Through the control method,on the premise that the requirement of a room load is met, air-feeling-free air supply enjoyment is really brought to a user, and the comfort level of a human body is increased.

The invention discloses a high-temperature closed-type cooling tower with a precooling device, which includes a cooling tower body, and a spray branch pipe is arranged in the cooling tower body, and the spray branch pipe is connected with a spray water pump through a first main pipe. A first group of serpentine coils and heat dissipation filler filter screens are provided below the spraying branch pipes. The bottom of the cooling tower body is a water tank, and a second group of serpentine coils is arranged in the water tank. The second group of serpentine coils is connected with the first group of serpentine coils through the second main pipe. In the present invention, by setting the first group of serpentine coils and the second group of serpentine coils, the second group of serpentine coils is located in the water storage tank for water immersion heat exchange, and the high-temperature closed cooling tower is well Realize pre-cooling, so that the high-temperature fluid enters the first set of serpentine coils after pre-cooling, thereby avoiding the overheated high-temperature water from causing the spray water to evaporate instantly on the surface of the first set of serpentine coils, and solving the problem of high-temperature fluid in the closed cooling tower. The problem that the outer surface of the coil is easy to scale and cannot be cooled.

The invention relates to the technical field of air conditioner heat pumps, in particular to a triaxial pressure high-efficient air cooled heat pump unit applicable to large temperature difference. The triaxial pressure high-efficient air cooled heat pump unit comprises a main path compressor, a main path oil separator, a four-way reversing valve, an outdoor heat exchanger, an outdoor draught fan, a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve, a fifth one-way valve, a sixth one-way valve, a subcooler, a drying filter, an observation mirror, a first expansion valve, a medium-pressure gas-liquid separator, a second expansion valve, an indoor heat exchanger, a low-pressure gas-liquid separator, an evaporation pressure adjustor, an auxiliary path compressor, an auxiliary path oil separator and a connecting pipe. The triaxial pressure high-efficient air cooled heat pump unit solves the prominent problems about the high-temperature refrigeration working mode at summer and the low-temperature heating working mode at winter, has the characteristics of being wider in energy adjusting range and rapid and energy-saving in defrosting, and widens the application field of the air cooled heat pump.

The invention provides a freon-free frequency-conversion air conditioner system, comprising an outdoor heat exchanger, an indoor heat exchanger and a compressor which are serially connected to form a circulation loop via a refrigerant pipeline, wherein the compressor comprises an air supplement opening, and an air supplement branch which is connected to the air supplement opening is arranged on a bypass of the refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger, therefore, gaseous refrigerant can be selectively supplemented to a compressing chamber of the compressor. The Freon-free frequency-conversion air conditioner system is beneficial to solving of the problems of poor refrigerating capacity and poor heating capacity of the prior art under severe environment.

The invention provides a control method and system for a multi-connected air conditioner under the refrigeration working condition. The multi-connected air conditioner comprises a multi-connected air-conditioning unit and a fresh air unit; the multi-connected air-conditioning unit comprises a plurality of indoor units; and the fresh air unit comprises an indoor heat exchanger and a valve body usedfor controlling a flow rate of a refrigerant which enters the heat exchanger. The control method for the multi-connected air conditioner under the refrigeration working condition comprises the following steps of after receiving a refrigeration turning-on command, acquiring an air return temperature of the fresh air unit; calculating a current superheat degree according to preset calculation requirements corresponding to the air return temperature; and calculating a regulation opening degree of the valve body according to a difference between the current superheat degree and a target superheatdegree, and controlling the valve body according to the regulation opening degree. Aiming to different air return temperatures, the current superheat degrees are calculated according to different calculation requirements, and the opening degree of the valve body is controlled through the difference between the current superheat degree and the target superheat degree, so that the problem that during high-temperature refrigeration or low-temperature refrigeration, the fresh air unit occupies too much or too little refrigerant to influence the refrigeration effect of the multi-connected air conditioner is solved.