43results about How to "Increase rate of ascent" patented technology

The invention discloses the bisalient-pole electric machine advance angle controlling method and the circuit, the connection table of the time frequency, the rotating speed and the back moving pulse is deposited in the RAM zone of the digital signal processor, then the corresponding data is read during the controlling process, the advance angle can be controlled; the circuit includes the tally, the lock phase loop and the digital signal processor, the three phase positional signal of the electric machine are imported into the digital signal processor, another locking phase loop separating the frequency can be choosed to choose the different time frequency according to the practice needing, the needing of the controlled precision can be reached. The method of the invention is flexible to improve the bisalient- pole electric machine contributing on the each speed section. It can be applied in the constant speed system, the rising rate of the phase circuit can be improved highly, the speed of the electric machine with the same loading is higher compared to the existing controlling method, the application of the timing system can improve the loading ability of the electric machine and better the output power of the electric machine.

The invention belongs to the technical field of air sterilization and purification, in particular to an air purifying device which is specially designed for air purification of subway stations of closed systems and shield door systems. The air purifying device comprises a plasma reactor, a pulse power source, a fan component, a controller, a fresh air opening, an air outlet and a shell and is characterized in that a positive electrode and a negative electrode are arranged in the plasma reactor, wherein the positive electrode is a component which is formed by arranging a plurality of oxidation resistant metal bands in parallel, and the negative electrode is made of an aluminum plate or a stainless steel plate; a plurality of conductor rails for preventing micro-discharge are also arranged in the plasma reactor, and the positive electrode is fixed on each conductor rail for preventing micro-discharge; and a semiconductor switching tube Q1 and a pulse boosting transformer in the pulse power source are arranged according to a single-ended flyback inverter circuit. The invention has the advantages of high sterilization efficiency, good effects on degrading organic compounds and removing particulate matter, energy saving, good reliability and long working life. The invention is mainly used for air sterilization and purification of subway stations, tunnels, underground buildings and families.

A device for breaking DC currents exceeding 2500 A has a resonance circuit (2) connected in parallel with an interrupter (1) and a surge arrester (7) connected in parallel with the resonance circuit. The resonance circuit has a series connection of a capacitor (3) and an inductance (4). The specific value relationship of the capacitance in microfarad to the inductance in microhenry of the resonance circuit is not less than 1.

The invention discloses a pressure adjustor which comprises a shell. An adjusting cavity, a gas inlet cavity and a transition cavity are formed in the shell. A gas bag is arranged in the adjusting cavity. The adjusting cavity is communicated with the gas inlet cavity through a vent hole. The gas inlet cavity is communicated with the transition cavity through a small hole. Communicating holes are formed in the two sides of the gas inlet cavity. An ejector rod is arranged in the middle of the gas inlet cavity. The vertical section of the ejector rod is sleeved with a return spring. The top of the vertical section of the ejector rod penetrates through the vent hole and then upwards extends to be connected with the gas bag. A first ball is arranged at the bottom of the horizontal section of the ejector rod. A gasket is arranged on the inner wall of the gas inlet cavity. A sealing hole coaxial with the small hole is formed in the middle of the gasket. In order to solve the problem that in the prior art, during gas-lift production, high-pressure gas flow is not accurately adjusted, and then oil production efficiency is reduced, the different cavities are arranged for linkage control over high-pressure gas flow, so the circulation of high-pressure gas flow between a casing pipe and an oil pipe is more smooth, adjustment is more accurate, and gas-lift production efficiency is improved.

The invention specifically relates to an aramid paper honeycomb composite floor with strong sound insulation performance and a preparation method thereof, belonging to the technical field of preparation of new materials. The aramid paper honeycomb composite floor comprises cured sheets of prepreg, porous nitrile rubber and an aramid paper honeycomb, wherein the aramid paper honeycomb is glued between porous nitrile rubber I and porous nitrile rubber II by an adhesive; the upper surface of the porous nitrile rubber II is glued with a prepreg cured sheet I by the adhesive; the lower surface of the porous nitrile rubber II is glued with a prepreg cured sheet II by the adhesive; the prepreg cured sheets have surface density of 500 + / - 20 g / m<2>, resin content of 40% and volatile content of 8%; and the prepreg cured sheets comprise a single-layer prepreg cured sheet and a double-layer prepreg cured sheet, the single-layer prepreg cured sheet has a thickness of 0.25+ / - 0.025 mm, and the double-layer prepreg cured sheet has a thickness of 0.38 + / - 0.02mm.

The present invention is a passive organic LED activating method. The method comprises the steps: starting to apply a voltage to the organic LED to increase its anode potential; detecting the anode potential of the organic LED; comparing the detected anode potential with a reference voltage; performing a pre-charging process to the organic LED through its anode using a voltage source if the anode potential is lower than the reference voltage; the pre-charging process is stopped when the anode potential of the organic LED reaches the predetermined reference voltage. The reference voltage can be a fixed external voltage, or can be obtained dynamically by sampling dynamically the outputting potentials of a fixed current source using a sampling holding circuit.

The invention discloses a charge transfer type sense amplifier. The charge transfer type sense amplifier comprises a compensating circuit unit, wherein the compensating circuit unit is connected between a power supply voltage and a column data line node for providing a compensating current; the compensating circuit unit has a structure that the compensating current can self-adaptively change basedon a voltage of the column data line node; when a memory unit is in a programming state, a pull-down current of the memory unit for the column data line node is reduced, the column data line node isrequired to reach a high potential, the higher the voltage of the column data line node is, the larger the compensating current is, and the larger the compensating current is, the higher the rate at which the column data line node rises to a target value is; and when the memory unit is in an erasing state, the pull-down current of the memory unit for the column data line node is increased, the column data line node is required to reach a low potential, the lower the voltage of the column data line node is, the smaller the compensating current is, and the smaller the compensating current is, the higher the rate at which the column data line node drops to the target value is. The charge transfer type sense amplifier disclosed by the invention can increase a change rate of the column data line node, thereby increasing a reading rate.

The invention discloses a high-frequency thyristor. The high-frequency thyristor comprises a thyristor; a monocrystalline silicon wafer is formed by an asymmetric structure of P+P1N1P2N2, wherein the graph in an N2 region is an involute graph; in the monocrystalline silicon wafer, an N type (100) crystal orientation low resistance monocrystalline silicon wafer is used; a P<+> layer is formed by grinding and thinning a P layer; the thickness of the P<+> layer is 15 microns, and the thickness of the P layer is 60 microns. In the modelling surface of the monocrystalline silicon wafer, the grinding angle of a positive oblique angle theta1 is more than or equal to 60 degrees and less than or equal to 80 degrees; and the grinding angle of a negative oblique angle theta2 is more than or equal to 3.5 degrees and less than or equal to 4.5 degrees. A titanium nickel gold evaporation coating is arranged on the end face of the P<+> layer, and the thickness of Ti is 0.2 micron, the thickness of Ni is 0.5 micron and the thickness of Au is 0.1 micron. A method for manufacturing the high-frequency thyristor comprises the following steps of: arranging a diffusion P layer on double faces of the monocrystalline silicon wafer, wherein the P<+> layer is formed by grinding and thinning the P layer on one face, and an N2 region photolithography mask graph has an involute plug-in amplification gate pole structure; controlling the minority carrier lifetime tp for the monocrystalline silicon wafer and the N2 region photolithography mask graph by using a gold expansion method and an electron irradiation method respectively; evaporating by using an electron beam to form the titanium nickel gold evaporation coating; and blasting sand in a large angel for modeling. By the invention, the application frequency of the thyristor and the quality of products are improved, and the requirements of energy conservation and consumption reduction are met.

The invention discloses a method for improving the heating performance of an automobile air conditioner, wherein the air inlet of the automobile air conditioning system has three states, which are aninternal circulation state, an external circulation state and an intermediate compensation state, and the method mainly utilizes the intermediate compensation state to improve the heating performance;the method comprises the following steps of: judging whether the current temperature setting is of a heating state in response to the vehicle being electrically connected to the ON gear; if not in aheating state, judging whether the current mode of the air inlet of the heating ventilation air conditioner is set to the external circulation state, if so, controlling a circulation air door to be inthe external circulation state, if not, controlling the circulation air door to be in the internal circulation state; if in a heating state, judging whether the current mode of the air inlet of the heating ventilation air conditioner is set to the external circulation state, if not, controlling the circulation air door to be in the internal circulation state, if yes, judging whether the current gear of the blower is larger than a preset gear, if so, then controlling the circulation air door to be in the intermediate compensation state, and if not, controlling the circulation air door to be inthe external circulation state. The method can effectively improve the heating performance of the air conditioner.

The invention discloses an AC limiter and a current limiting method thereof. The AC limiter comprises an incoming line end, an outgoing line end, a vacuum arc extinguishing chamber, an operating mechanism, a current limiting reactor, an armature, a static contact, a movable contact, a connection rod, an iron core and a coil. The invention also discloses the current limiting method of the AC limiter. Power switch equipment and the current limiting reactor are integratedly designed, and the integral volume of equipment is reduced; and meanwhile, the reactance of the current limiting reactor is gradually increased during the acting process of the operating mechanism, TRV generated at two ends of the current limiting reactor is reduced, and an energy absorption lightning arrester connected inparallel to the current limiter is omitted. The AC limiter has the advantages of simple and compact structure, low cost, small size and the like.

The embodiment of the invention discloses a receiving chip circuit and a communication system; wherein, the receiving chip circuit comprises M receiving chips; in the M receiving chips, the input ends of N receiving chips are respectively provided with a regulating circuit which is used for gaining energy of clock signals input into the input end of the N receiving chips in a selected frequency band to a preset value; wherein, N is an integer which is more than zero and M is larger than N. The communication system comprises a PCB, which is provided with a clock chip and the receiving chip circuit; and the clock chip provides clock signals for the M receiving chips in the receiving chip circuit by transmission lines. The embodiment of the invention can effectively improve rising rate of the clock signals, reduce the rising time of the clock signals, meet the input requirements of working chips and guarantee the stable working of the working chips.

The electro-magnetic driving apparatus 11 for controlling wefting in weaving machine comprises a releasing solenoid 14 for driving a moving workpiece 15 to a position for allowing releasing, and a stopping solenoid 13 for driving the moving work piece 15 to a position for stopping releasing. The number of winding coils of the releasing solenoid 14 is less than that of the stopping solenoid 13. Thus, comparing the releasing solenoid 14 with the stopping solenoid 13, the elimination of remaining current in the releasing solenoid 14 can be achieved faster. Therefore, for example, it is possible to accelerate a rise-up speed of a magnetizing current in the stopping solenoid 13 and further possible to increase the rise-up speed of the magnetizing current by means of a decrease of a mutual inductance.

The invention discloses an electromagnetic valve high-dynamic high-frequency response control method based on a voltage pulse width modulation technology. A single working period of an electromagneticvalve is divided into a preloading excitation stage, a preloading maintaining stage, an opening stage, a reverse excitation stage, an opening maintaining stage, a closing stage and a closing maintaining stage. A single voltage source is adopted, the voltage source modulated by a high-frequency square wave signal with the duty ratio of 100% is adopted for excitation in the preloading stage, the current rising rate is higher, the current rises to the preloading current state faster, and the time consumed in the preloading excitation stage is shorter; and the current is then maintained in a preloaded current state. According to the method, in a reverse excitation stage, the voltage source modulated by the high-frequency square wave signal with the duty ratio of -100% is adopted for excitation, and the current is rapidly reduced to a maintaining current; and according to the electromagnetic valve, the average current in the working period is reduced, the electromagnetic energy consumptionis reduced, and the electromagnetic valve can adapt to a better opening and closing working condition.

The invention discloses an excitation power supply for suppressing an overshoot phenomenon of laser pulse. The excitation power supply comprises a control module, a switching power supply module and a resonance module, wherein the control module outputs a driving pulse signal with variable frequencies; after the driving pulse signal is processed by the switching power supply module, an alternating current square wave signal is output; and after the alternating current square wave signal is subjected to amplitude modulation by the resonance module, the alternating current square wave signal is converted into a periodical excitation signal which has a low electric level and then a high electric level in sequence in each period. The excitation signal output by the excitation power supply can suppress the overshoot phenomenon; meanwhile, the rise of the laser pulse becomes more steep, so that the requirement on the laser pulse output waveform in laser processing can be satisfied; and therefore, the excitation power supply is of great significance to the improvement of the laser pulse processing quality and efficiency.

The invention relates to the technical field of evaporators, and discloses a rotary climbing film evaporator, which comprises an outer sealing tank, wherein a middle feed liquid tank is fixedly mounted in the outer sealing tank, and a plugging base is fixedly mounted on the right side of the bottom of an inner cavity of the middle feed liquid tank. The heating rotary tank is eccentrically arrangedin the middle material liquid tank; therefore, the heating rotary tank can rotate in the rotating process, so that the space between the heating rotary tank and the middle feed liquid tank is compressed by the flat plate, and the liquid film and the generated steam can be compressed so as to increase the rising speed of the generated steam and the liquid film; meanwhile, due to the arrangement ofthe flat plate, the flat plate is in continuous contact with the inner wall of the middle feed liquid tank under the rotating centrifugal force of the heating rotating tank and the pressure of high-temperature steam, then crystals separated out of feed liquid on the inner wall of the middle feed liquid tank are scraped off, scaling residues are reduced, the heat exchange efficiency is improved, and the application range of the evaporator is widened.

In order to enable a lubricant to be supplied continuously to the contact area of one end of arm members and a cam surface, thus improving the lubrication capability at the contact area of the one end of the arm members and a cam member, and preventing wear, seizing and the like at the contact area of the one end of the arm members and the cam surface, a torsional oscillation damping device (1) has an annular part (21), which is attached to a disk plate (7) so as to surround a cam member (2) and arm members (16), and with which a portion of a grease (24) is held in the space between an inner circumferential part (21a) and the outer peripheral part of the arm members (16) in the radial direction when the grease (24) is scattered by centrifugal force and adheres to the inner circumferential part (21a) as the torsional oscillation damping device (1) rotates. Furthermore, the curved shape of the outer circumferential part (16c) of the arm members (16) is set with respect to the shape of the inner circumferential part (21a) of the annular part (21) such that when the arm members (16) turn so as to move one end part (16a) of the arm members (16) from the radially inward direction of the cam surface (2a) to the radially outward direction, the distance between the outer circumferential part (16c) of the arm members (16) and the inner circumferential part (21a) of the annular part (21) maintains a positional relationship wherein the distance increases gradually from the outer circumferential base point part (16d) of the arm members (16) toward the base end part (26a) of guide plates (26).

The invention discloses an electromagnetic heating system and a heating control method thereof, and a heating control device; the method comprises the following steps: obtaining a target duty ratio, and obtaining a duty ratio adjusting mode; when adjusting the duty ratio in a gradient mode, controlling the duty ratio of a control signal outputted to an IGBT tube to gradually drop to the target duty ratio from a preset duty ratio, controlling the electromagnetic heating system to work according to the gradually lowered duty ratio, controlling the duty ratio of the control signal to be at the target duty ratio after the target duty ratio is reached, and controlling the electromagnetic heating system to work according to the target duty ratio; in the electromagnetic heating system working process, sampling the work current of the electromagnetic heating system in a heating cycle corresponding to the gradually lowered duty ratio or the target duty ratio, and controlling the heating power of the electromagnetic heating system according to the sampled work current. The method can collect the proper current value, thus preventing pot-free misjudgement phenomenon of the electromagnetic heating system duo to the undersized current.

The invention relates to a flexible electric braking method of a large-sized water turbine generator, which is suitable for a controllable rectification excitation system adopting the parallel running of a plurality of excitation rectification bridges for meeting the capabilities of excitation and excitation forcing. The invention has the core that the complete input of the traditional rectification bridges is improved into partial input. Because the number of the parallel rectification bridges is reduced, the ascension rate of current flowing through thyristors in rectification bridges input in the running is also increased correspondingly, and the current of the thyristors in the controllable rectification bridges exceeds the latching current of the controllable rectification bridges before triggering pulses disappear, thereby solving the problem of braking failure caused by the hysteresis effect of the induction of rotors and the effect of the latching current of the thyristors and ensuring the safe running of a water turbine generator set.

The invention discloses a switching circuit control circuit and a switching circuit. The switching circuit control circuit comprises a compensation circuit which comprises an output voltage judging circuit, a timing circuit, a transconductance gain adjusting circuit and a transconductance amplifier, wherein the first input end of the transconductance amplifier receives a first voltage signal representing the output current, and the second input end of the transconductance amplifier receives a reference voltage, the output end of the transconductance amplifier is connected with one end of a compensation capacitor, and the other end of the compensation capacitor is grounded, the output voltage judging circuit and the timing circuit are used for receiving a sampling signal representing the output voltage and are respectively connected to the transconductance gain adjusting circuit, the transconductance gain adjusting circuit controls the transconductance gain of the transconductance amplifier, the charging current of the compensation capacitor is increased in the starting stage of the switching circuit, and the voltage rise of the compensation capacitor is accelerated. According to the invention, the rising rate of the voltage during the initial working state of the compensation capacitor is controlled, so that the compensation capacitor can be rapidly charged, and then rapid starting is completed.

The invention discloses a charge transfer type sense amplifier. The charge transfer type sense amplifier comprises a compensating circuit unit, wherein the compensating circuit unit is connected between a power supply voltage and a column data line node for providing a compensating current; the compensating circuit unit has a structure that the compensating current can self-adaptively change basedon a voltage of the column data line node; when a memory unit is in a programming state, a pull-down current of the memory unit for the column data line node is reduced, the column data line node isrequired to reach a high potential, the higher the voltage of the column data line node is, the larger the compensating current is, and the larger the compensating current is, the higher the rate at which the column data line node rises to a target value is; and when the memory unit is in an erasing state, the pull-down current of the memory unit for the column data line node is increased, the column data line node is required to reach a low potential, the lower the voltage of the column data line node is, the smaller the compensating current is, and the smaller the compensating current is, the higher the rate at which the column data line node drops to the target value is. The charge transfer type sense amplifier disclosed by the invention can increase a change rate of the column data line node, thereby increasing a reading rate.

The invention relates to the technical field of evaporators, and discloses a rotary rising film evaporator, which includes an outer sealed tank, a middle feed liquid tank is fixedly installed inside the outer seal tank, and the bottom of the inner cavity of the middle feed liquid tank The right side is fixedly installed with a blocking base. Through the eccentric setting of the heating rotary tank inside the middle material liquid tank, during the rotation process of the heating rotary tank, the flat plate is used to compress the space between the heating rotary tank and the middle material liquid tank, and the liquid film and the generated steam are squeezed. pressure to accelerate the rising rate of the generated steam and liquid film, thereby improving production efficiency. At the same time, through the setting of the flat plate, it will continue to contact the inner wall of the middle material and liquid tank under the pressure of the rotating centrifugal force of the heating rotary tank and the pressure of high-temperature steam, thereby improving the production efficiency. The crystals precipitated from the feed liquid on the inner wall of the middle feed liquid tank are scraped off to reduce the residue of scaling, improve the heat exchange efficiency, and increase the scope of application of the evaporator.

The invention relates to a constant current control system comprising a DC power supply having a voltage E on loop ground G, a controller used for adjusting the c-e two-end voltage Vce according to an input voltage value Vr, a two-end current detector, and a two-end load; the two-end load, the c end and e end of the controller, and the two-end current detector are connected in series between the DC power supply voltage E and the loop ground G, thus forming a loop having a current I; the controller comprises a voltage drop regulator used for adjusting the c-e two-end voltage Vce and a shunt resistor connected in parallel with the c-e ends, wherein the shunt resistor resistance value is Rd; the constant current control system can reduce the current flowing through the voltage drop regulator in the controller, thus reducing the voltage drop regulator heat rate, and improving the constant current control system reliability.

The invention discloses a bean grinding and peeling device. The device comprises a machine body and a grinding wheel set arranged in the machine body, wherein an air drawing device is arranged above the grinding wheel set, an air flue is formed between the air drawing device and the grinding wheel set; the device further comprises a bean hull conveying device, wherein the bean hull conveying device comprises a conveying cylinder, the conveying cylinder is arranged in a hull storage box located at the upper end of the air flue, the conveying cylinder divides an inner cavity of the hull storagebox into an outer chamber and an inner chamber, the air flue is communicated with the inner chamber, and a plurality of one-way vent holes are formed in the side wall of the conveying cylinder, so that the outer chamber is communicated with the inner chamber, and air inlet ends of the one-way vent holes are communicated with the inner chamber; when the air drawing device extracts air in the outerchamber to generate negative pressure in the outer chamber, the one-way vent holes are opened, so that the air drawing device makes the bean hulls generated by the grinding wheel set to enter the outer chamber through the air flue and the one-way vent holes in sequence. The bean grinding and peeling device increases the separation rate between the bean hulls and bean meal due to the above structures.

The invention discloses a bean grinding and peeling device. The device comprises a machine body and a grinding wheel set arranged in the machine body, wherein an air drawing device is arranged above the grinding wheel set, an air flue is formed between the air drawing device and the grinding wheel set; the device further comprises a bean hull conveying device, wherein the bean hull conveying device comprises a conveying cylinder, the conveying cylinder is arranged in a hull storage box located at the upper end of the air flue, the conveying cylinder divides an inner cavity of the hull storagebox into an outer chamber and an inner chamber, the air flue is communicated with the inner chamber, and a plurality of one-way vent holes are formed in the side wall of the conveying cylinder, so that the outer chamber is communicated with the inner chamber, and air inlet ends of the one-way vent holes are communicated with the inner chamber; when the air drawing device extracts air in the outerchamber to generate negative pressure in the outer chamber, the one-way vent holes are opened, so that the air drawing device makes the bean hulls generated by the grinding wheel set to enter the outer chamber through the air flue and the one-way vent holes in sequence. The bean grinding and peeling device increases the separation rate between the bean hulls and bean meal due to the above structures.

The embodiment of the invention discloses a receiving chip circuit and a communication system; wherein, the receiving chip circuit comprises M receiving chips; in the M receiving chips, the input ends of N receiving chips are respectively provided with a regulating circuit which is used for gaining energy of clock signals input into the input end of the N receiving chips in a selected frequency band to a preset value; wherein, N is an integer which is more than zero and M is larger than N. The communication system comprises a PCB, which is provided with a clock chip and the receiving chip circuit; and the clock chip provides clock signals for the M receiving chips in the receiving chip circuit by transmission lines. The embodiment of the invention can effectively improve rising rate of the clock signals, reduce the rising time of the clock signals, meet the input requirements of working chips and guarantee the stable working of the working chips.

The disclosure herein relates to a helical bed biofilm reactor for wastewater treatment, and belongs to the fields of environment engineering and chemical engineering. The helical bed biofilm reactor comprises a reaction vessel, a draft tube, helical screen meshes, carriers, a carrier passage, a gas distributor, a gas inlet, a gas outlet, a water inlet, a water outlet and a sludge outlet. By improving the arrangement structure of the carriers and the structure of the helical passage, the helical bed biofilm reactor improves the oxygen transfer rate, the oxygen transfer efficiency and the biological reaction efficiency of a biological treatment process of wastewater, and helps to control the thickness of the biofilm and reduce energy consumption in wastewater treatment.

The invention discloses a pressure regulator which comprises a shell. The shell is internally provided with an adjusting cavity, an air inlet cavity and a transition cavity, an air bag is installed inthe adjusting cavity, the adjusting cavity is communicated with the air inlet cavity through an air hole, the air inlet cavity is communicated with the transition cavity through a small hole, throughholes are formed in the two sides of the air inlet cavity, an ejecting rod is arranged in the middle of the air inlet cavity, a return spring sleeves the vertical section of the ejecting rod, the topof the vertical section of the ejecting rod penetrates through the air hole and extends upwards to be connected with the air bag, a first sphere is arranged at the bottom of the horizontal section ofthe ejecting rod, a gasket is arranged on the inner wall of the air inlet cavity, and a seal hole coaxial with the small hole is formed in the middle of the gasket. Aiming at the problem that when gas lift production is conducted in the prior art, adjustment on high pressure air flow is inaccurate, and then the oil-production efficiency is lowered is solved, by arranging different cavities, the high pressure air flow is subjected to linkage control, the high pressure air flow circulates between a sleeve and an oil pipe more smoothly, adjustment is more accurate, and then the gas lift production efficiency is improved.

The invention discloses a method for improving the heating performance of an automobile air conditioner. The air intake of the automobile air conditioner system has three states, which are respectively an internal circulation state, an external circulation state and an intermediate compensation state. The method mainly utilizes the intermediate compensation state to improve the heating performance ; The method includes the following steps: in response to the vehicle being powered on to the ON gear, judging whether the current temperature setting is a heating state; if it is a non-heating state, then judging whether the current mode of the HVAC air inlet is set to an external circulation state, if , then control the circulation damper to the external circulation state, if not, control the circulation damper to the internal circulation state; if it is in the heating state, then judge whether the current mode of the HVAC air inlet is set to the external circulation state, if not, control the circulation The damper is in the internal circulation state, if so, then judge whether the current gear of the blower is greater than the preset gear, if so, control the circulation damper to the intermediate compensation state, if not, then control the circulation damper to the outer circulation state. The invention can effectively improve the heating performance of the air conditioner.