97results about How to "Improve mechanical efficiency" patented technology

The invention discloses a self-oil-catching low-friction composite groove of an inner curve hydraulic motor valve plate and a parameterization design method of the self-oil-catching low-friction composite groove, aiming at the low-friction design of the valve plate, the low-friction composite groove with a self-oil-catching function is designed on a plane of a sealing belt of the valve plate. Structural parametric modeling is conducted on the composite grooves, structural parameters corresponding to the composite grooves are reasonably selected, the valve plate composite grooves of different structures are obtained, corresponding structural models are established, and lubricating oil film distribution, bearing capacity and friction coefficients corresponding to the different structural models of the valve plate composite grooves are obtained through calculation and testing. And performing comprehensive comparison to obtain the optimal design parameters of the composite groove of the valve plate, which meet the optimization target. The self-oil-catching low-friction composite grooves with different structural parameters are designed on the surface of the valve plate of the inner curve hydraulic motor, so that the low-friction design of the surface of the valve plate is realized, the abrasion of the surface of the valve plate is reduced, the mechanical efficiency of the inner curve hydraulic motor is improved, and the service life of the inner curve hydraulic motor is prolonged.

The invention discloses a convenient-to-adjust welding workstation for hardware machining, and relates to the technical field of adjusting welding, the convenient-to-adjust welding workstation for hardware machining comprises an equipment frame, a welding mechanism is fixedly mounted on the outer wall of the equipment frame, a first motor is fixedly mounted on the surface of the equipment frame, and the convenient-to-adjust welding workstation for hardware machining further comprises a clamping device; wherein the clamping device comprises a rotating rod, a fixing plate, a rotating pipe, an electric push rod, a clamping plate, a large gear, a second motor, a connecting rod, a circular plate and a small gear, and the rotating rod is fixedly installed at the output end of the first motor. The hardware is fixed in the welding process, the situation that the hardware is damaged due to the fact that the hardware shakes in the welding process and falls off can be prevented, meanwhile, the non-welded side is rotated, the hardware can be adjusted to the optimal position more easily, and unnecessary torsion and stretching are reduced.

The turbulence friction resistance reduction device based on array type corona micro-blowing comprises a corona discharge cavity plate (1) and a discharge electrode (2). A plurality of cylindrical inclined micro holes are formed in the front face of the corona discharge cavity plate (1) and serve as corona discharge anodes, the cylindrical inclined micro holes are distributed in the front face of the corona discharge cavity plate (1) in an array mode, and the inclined directions of the cylindrical inclined micro holes are changed in a staggered mode. The high-voltage direct-current power supply (4) generates direct-current high voltage and applies the direct-current high voltage to the discharge electrode (2), plasma (6) is generated between the discharge electrode (2) and the corona discharge cavity plate (1), two oblique jet flows of each discharge group are coupled to form spirally-rising jet flows, a normal blowing effect is generated in a flow field, and turbulent friction resistance reduction is achieved. The invention further provides a turbulence friction resistance reduction device and method based on array type corona discharge. The sensor is arranged in a flow field to collect flow field data, the flow field state is sensed in real time, the corona discharge mode is controlled, the optimal resistance reduction effect is kept in the rapidly-changed flow field state, and the resistance reduction adaptability is further improved.

The utility model discloses a mud pulse generator driven by a motor. The mud pulse generator is used for extracting signals of an inclinometer while drilling. Comprising a main valve head assembly and a servo assembly, the servo assembly comprises a screen drum and a valve seat arranged in the screen drum, a valve sleeve is arranged at a mud channel of the valve seat, the valve sleeve and a servo valve rod are oppositely arranged, and the servo valve rod can move to be seamlessly attached to the valve sleeve; a servo valve rod is connected with a ball screw nut, a hexagonal shaft sleeve on a ball screw shaft is connected with a speed reducer, the speed reducer is connected with a fixing seat assembly, and the periphery of the fixing seat assembly is sleeved with an outer rotor assembly. The outer rotor assembly is connected with the motor short section and is driven by the motor. The motor is used for driving, so that rigid collision between the servo valve rod and the valve sleeve can be effectively avoided, abrasion between the servo valve rod and the valve sleeve is reduced, and the service life of the servo valve rod and the valve sleeve is prolonged.

The buffer type variable flow valve comprises a valve body, a valve element and two elastic components, the valve body is provided with an installation hole, the installation hole comprises a large-diameter section and a small-diameter section, the valve element is installed in the installation hole in a sliding mode, the peripheral wall of the valve element is attached to the inner wall of the small-diameter section, the interior of the large-diameter section is an inlet cavity, and the interior of the small-diameter section is an outlet cavity. The valve element is axially balanced under the action of the elastic component, a control flow channel is arranged on the peripheral wall of the valve element, in the axial balance state, the control flow channel is communicated with the inlet cavity and the outlet cavity, when the valve element moves close to the outlet cavity, the effective length of the control flow channel is gradually increased, and when the control flow channel is completely located in the small-diameter section, the effective length of the control flow channel is gradually increased. The control flow channel is isolated from the inlet cavity. According to the buffer type variable flow valve, the valve element can move along with the change of inlet oil pressure, the flow control and opening and closing functions of a control flow channel are achieved, the hydraulic rigidity and the damping characteristic of a hydraulic tensioner adopting the buffer type variable flow valve can be automatically adjusted, and different engine working conditions are considered.

The utility model discloses a lithium ion battery positive electrode material firing product crusher, which relates to the technical field of lithium ion battery electrode material treatment and comprises a crusher shell, a feeding device fixedly mounted at the top of the crusher shell, a multi-stage crushing device embedded in an inner cavity of the crusher shell, and a vibrating screen device, the secondary grinding device is arranged in an inner cavity of the vibration screening device, and the discharging device is arranged on one side of the crusher shell. According to the utility model, raw materials are crushed step by step through the multi-stage crushing device, so that the blockage of the device caused by overlarge feeding quantity is avoided, the crushing effect is good, and the standard-reaching rate of products is high; through the multi-stage crushing device and the vibrating screen device, repeated work doing on qualified raw materials is avoided, and the machining speed is increased while the mechanical efficiency is improved; and through the secondary grinding device and the discharging device, the quality is guaranteed, meanwhile, the discharging speed is increased, flying and attached powder in the device is sucked into a material collecting box along with products through an exhaust fan, waste is avoided, and meanwhile, cleanliness of an inner cavity of the device is guaranteed.

The utility model relates to the technical field of mechanical automation, in particular to a feeding positioning mechanism which comprises a lifting drive, a lifting device and a clamping jaw device fixed on the lifting device, and the clamping jaw device comprises a sliding plate seat, a clamping arm drive, at least two clamping jaws and clamping arms respectively driving the clamping jaws. The clamping arm driver is fixed on the sliding plate seat to drive the driving end to rotate and drive the swinging end to move; and the sliding plate seat is fixedly connected with one side of the lifting device in an up-down sliding manner. The clamping jaws are driven by the clamping arms to symmetrically clamp and loosen, so that the opening and closing of the clamping jaws are larger, and the clamping device is suitable for materials with different sizes. Meanwhile, the driving ends of the clamping arms are oppositely arranged, the clamping arms are driven by the clamping arms to rotate, the movement range of the driving ends is small, the movement range of the driving is enlarged through swinging, and the driving can be set to be smaller.

The utility model discloses a hollow motor-driven intelligent switch for oil and gas well layered control, which relates to the technical field of switches and comprises a support connecting unit, a transmission unit and a control communication unit, the support connecting unit mainly comprises a connector A, a fixed seat A, a connecting nut A, a valve seat, a transmission cavity shell, a connecting nut B, a connecting seat, a controller shell, a connecting pipe, a connecting nut C, a fixed seat B and a connector B; the transmission unit mainly comprises a dynamic sealing device B, a hollow torque motor, a speed reducer, an output flange plate, a bearing check ring, a transmission nut assembly, a hollow lead screw, a spacer ring, a dynamic sealing device A and a valve element. The control communication unit mainly comprises a central controller; the transmission link is reduced, the mechanical efficiency is improved, the working reliability is improved, and the continuous oil pipe is matched for dragging, so that the device can be put at any underground position at one time; and the large output torque ensures the normal opening of the intelligent switch under the condition that the internal and external pressure difference is not less than 10MPa.

This utility model relates to a hydraulic shaft thrust bearing, which includes: a thrust cylinder sleeve, a thrust cylinder core, a hydraulic chamber, an annular groove reservoir, a hydraulic pump, a liquid medium, etc. This utility model patent applies liquid pressure technology to the axial bearing, avoiding the hard contact between the thrust plate and the balls or rollers in ordinary thrust bearings, greatly reducing the motion resistance around the shaft and improving the mechanical efficiency of the rotational motion around the shaft.

The application discloses a polymer electrolyte with three-dimensional network fillers and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The application is based on a synergistic design concept of premixed filler guiding in-situ network growth, and hydrolysis of tetraethyl orthosilicate (TEOS) is regulated by formic acid. The premixed nano-SiO2 particles are used as nucleation sites to induce directional growth of SiO2 generated in-situ on the surface of the nano-SiO2 particles and mutual crosslinking, and the fillers form a three-dimensional crosslinked network structure in the polymer matrix. The application overcomes problems of easy agglomeration of fillers, incomplete crystallization inhibition and incomplete crosslinking of a single in-situ growth network due to lack of nucleation sites in a traditional physical blending method, and realizes synergistic enhancement of mechanical strength and ion transmission efficiency.

The utility model relates to the technical field of gear shafts, and discloses a high-strength walking beam input shaft which comprises a gear main shaft, reinforcing threads are formed in an inner cavity of the gear main shaft, a liquid retention cavity is formed in the inner cavity of the gear main shaft, and internal threads are formed in the inner wall of the side face of the reinforcing threads. According to the gear sealing device, the gasket is arranged, so that in the manufacturing process of machinery and equipment, the gasket is mainly used for preventing liquid or gas media from leaking, a system is protected against the influence of the external environment, and the service life of the gear sealing device is prolonged. The gasket can reduce friction and abrasion between two contact surfaces, protect parts from being damaged, prolong the service life of equipment, can be used for adjusting the gap or levelness between the parts to ensure normal operation of the equipment under some conditions, has buffering performance, can absorb vibration and impact, and can be used for improving the service life of the equipment. And the influence of noise and vibration on equipment is reduced.

The invention relates to the technical field of gyrators, and discloses a double-motor-driven large-torque gyrator for a directional drilling machine, a hydraulic motor is mounted on one side, far away from a gear box body, of a planetary speed reducing mechanism, and two braking devices are mounted above the other side of the gear box body; the cylindrical gear reducing mechanism is mounted in the gear box body; by arranging the first-stage planetary speed reduction mechanism and the cylindrical gear speed reduction mechanism for transmission, under the condition of the same transmission ratio, the size of a required reduction gearbox is smaller, the transmission stability is improved, and large-torque output is achieved; a single large-displacement hydraulic motor is driven into a double-hydraulic-motor driving structure, so that torque multiplication can be realized under the same condition; the motor displacement is reduced to half of the original displacement under the same torque, the mechanical efficiency of the whole machine is improved, and heating of a hydraulic system is reduced; a single braking device is changed into a double-braking device, the braking torque is improved, the double-braking device is arranged in the opposite direction of the double hydraulic motors, the braking torque is multiplied, the size is small, and the structural layout is reasonable and attractive.

The utility model discloses a high leakproofness die structure for aluminum alloy semi-solid die casting, which comprises a fixed die and a feeding assembly, the middle of the bottom of the right side of the fixed die is provided with the feeding assembly, the edge of the right side of the fixed die is fixedly connected with a first fixed block, and the middle of the right side of the first fixed block is provided with a groove. A first fixing block, a sliding block, a connecting rod and a spray head are arranged, the first fixing block is installed on the right side of a fixed mold, the sliding block is inserted into the middle of the first fixing block, the connecting rod is arranged on the outer side of the sliding block, and the spray head is arranged at the other end of the connecting rod and faces the inner side of the left side face of the fixed mold. In the reciprocating motion that the movable die moves close to and away from the fixed die, lubricating oil is evenly smeared on the piston rod, the friction resistance of moving of the movable die is reduced, the mechanical efficiency is improved, the sealing performance of the piston rod is enhanced, and oxidation and other corrosion are prevented.

The utility model provides a two-degree-of-freedom efficient piston pump, and belongs to the field of piston pumps. The piston pump solves the problem that the efficiency and the stability of a traditional piston pump can be limited when high-flow, high-pressure or special-flow-state fluid conveying is needed in some application scenes. The two-degree-of-freedom efficient piston pump comprises a cylinder body, a containing cavity is formed in the cylinder body, a piston seat used for transmitting power is arranged in the cylinder body, a first piston rod and a second piston rod which are used for transmitting power are arranged at the front end and the rear end of the piston seat respectively, and cams with a fixing function are arranged on the first piston rod and the second piston rod in a sleeving mode. The extending parts of the first piston rod and the second piston rod are respectively provided with a rolling wheel playing a rotating role, the rolling wheels are connected with the cam, and the second piston rod is provided with a coupler used for transmitting motion and torque. The utility model has the advantages that the volumetric efficiency of the pump is improved, and the mechanical efficiency of the pump is also improved.

The present invention discloses a blank turning hoist for processing aerated building blocks, comprising a fixed frame, a movable frame and a hoisting structure, wherein a traction mechanism is installed on the fixed frame, wherein the traction mechanism is interconnected with a cleaning mechanism, wherein the traction mechanism is interconnected with a protective mechanism, and wherein the protective mechanism is fixed on the movable frame. The blank turning hoist for processing aerated building blocks adopts a pulley traction mechanism, which can realize the hoisting and traction of heavy objects under a relatively small traction force, thereby effectively avoiding damage to the motor, and cooperates with a linked elastic snap-fit ​​protective mechanism, which can realize the locking and positioning protection of the device when the wire rope breaks during the operation of the device, thereby avoiding the occurrence of safety accidents caused by the direct fall of the device, and ensuring the safe operation of the device, and cooperates with a linked cleaning mechanism, which can avoid the adhesion of gravel and foreign matter to the wire rope during the processing process to increase friction, thereby extending the service life of the wire rope.

The utility model provides an electric drive axle and a new energy vehicle, and relates to the technical field of vehicle engineering, the electric drive axle provided by the utility model comprises an axle housing, a transmission and an oil guide piece; the transmission is provided with a main reduction gear with the axis extending in the horizontal direction, the axle housing is connected with the transmission, oil immersing part of the main reduction gear from bottom to top is arranged in the axle housing, the oil guide piece is connected with the axle housing or the transmission, the oil guide piece is provided with an oil guide face extending in the circumferential direction of the main reduction gear, and the oil stirred by the main reduction gear can be prevented from impacting the axle housing; the resistance to oil is small, impact on the axle housing caused by stirring in the oil can be relieved, on one hand, mechanical energy loss is reduced, on the other hand, temperature rise caused by the fact that the axle housing is impacted by the oil is reduced, the mechanical efficiency of the electric drive axle is improved, and the service life of the electric drive axle is prolonged.

The utility model discloses a movable machine tool milling cutter clamp which comprises a base, clamping plates extending along the two sides of the lower end face of the base, positioning plates arranged on the outer sides of the clamping plates, clamping pieces attached to the inner sides of the clamping plates, first through installation holes evenly distributed in the plate faces of the clamping plates on the two sides and the positioning plates, and an embedding hole formed in the middle of the lower end face of the base. The upper end of the transmission shaft is coaxially connected with a motor; a sliding section, a sealing section and a polishing section are sequentially arranged on the outer surface of the cutter body from top to bottom, a shaft sleeve is further arranged on the outer side of the cutter body in a sleeved mode, a groove body and a protruding piece which correspond to the sliding section and the sealing section respectively are arranged in a cavity of the shaft sleeve, a plurality of balls are arranged between the groove body in the shaft sleeve and the groove body of the sliding section, and the protruding piece protrudes out of the groove body of the sealing section. A mounting block is arranged at the upper end of the shaft sleeve, sliding grooves corresponding to the clamping pieces are formed in the two sides of the mounting block, and second mounting holes corresponding to the first mounting holes are formed in the two sides of the sliding grooves in the two sides, so that the sealing performance is better, replacement and mounting are more convenient, and the service life is longer.

The utility model discloses a high-efficiency full-magnetic direct-current motor control circuit, which comprises a direct-current bus DC +, a direct-current cathode DC-, an IGBT (Insulated Gate Bipolar Transistor) chopping voltage-regulating element Q on the direct-current bus, a three-phase or multi-phase full-bridge control circuit, a full-bridge commutation control circuit consisting of four IGBT switching elements K1 / K2 / K3 / K4 in each phase of full-bridge control circuit, and a phase winding for controlling a motor, and a Buck circuit consisting of a capacitor C1, an inductor L1, a diode D1 and a diode DA is also arranged in front of each phase of full-bridge commutation control circuit. The utility model relates to the technical field of full-magnetic direct current motor control, direct current power supply enters a motor winding after being subjected to high-frequency chopping voltage regulation and voltage stabilization by the Buck circuit, and the current entering the motor winding does not contain high-frequency characteristics, so that the direct current power supply is stable and stable. The high-frequency noise of the motor can be effectively reduced, meanwhile, the capacitor C1 can absorb counter potential energy in the motor winding, the counter potential energy is released into the motor winding again through the Buck circuit, and the mechanical efficiency of the motor is greatly improved through the counter potential energy.

The utility model discloses a marine propeller gearbox, which belongs to the technical field of marine propellers, and comprises a main box shell, a shaft pipe sleeve is fixedly mounted at the bottom end of the main box shell, a lower box shell is fixedly mounted at the bottom end of the shaft pipe sleeve, a clutch mechanism is arranged in the main box shell, and the lower box shell is fixedly mounted at the bottom end of the shaft pipe sleeve. A gear shifting mechanism is arranged in the main box shell, and a transmission mechanism is arranged in the shaft pipe sleeve and the lower box shell. The clutch mechanism and the gear shifting mechanism are arranged, the wet-type multi-plate clutch is adopted as a core component of the clutch mechanism, the clutch is composed of a plurality of metal friction plates and a pressing device, the metal friction plates are arranged alternately, the friction plates are soaked in lubricating oil, and the lubricating oil not only plays a cooling role, but also can provide a more stable friction coefficient. According to the utility model, the gear shifting mechanism and the transmission mechanism are arranged, and the horizontal shaft design is used, so that the use cost is reduced.

The utility model provides a kind of bridge crossing device and combine harvester, comprising: bridge crossing shell;Driving mechanism, including driving motor and reduction box, the reduction casing of the reduction box is installed in the bridge crossing shell, the driving motor is installed in the reduction casing, the reduction box is provided with input interface and output interface, the input interface and the driving motor transmission connection;Bridge crossing lower shaft, install in the bridge crossing shell and with the output interface transmission connection, the bridge crossing lower shaft is used to transmit power to the cutting platform of the combine harvester;Bridge crossing upper shaft, install in the bridge crossing shell and with the bridge crossing lower shaft transmission connection, the bridge crossing upper shaft is used to transmit power to the conveying system of combine harvester.The utility model can significantly improve the integration of system and mechanical efficiency, and omit transmission component can make that space installation is more free, especially suitable for the installation demand of compact side space of combine harvester.

The utility model discloses a homogenization pretreatment device for waste plastic gasification. The pretreatment device comprises a heating system, a pressing system, a crushing system and a rack. The material pressing system comprises a hydraulic cylinder and a material pressing piston, one side of the material pressing piston is fixedly connected with a piston rod on the hydraulic cylinder, the other side of the material pressing piston is connected with the heating system, a heat source of the heating system comes from high-temperature flue gas generated by waste plastic gasification, and heated and softened plastic is extruded by the material pressing system to pass through a sieve plate to be crushed by the crushing system. After the homogenization pretreatment, the gas is sent to a gasification device; the device disclosed by the utility model is simple in structure, convenient to crush and high in mechanical efficiency, and effectively realizes the homogenization of the waste plastics.

The multifunctional knife line beam lifting mechanism comprises a plurality of mounting plates, adjusting assemblies are arranged on one sides of the mounting plates and at one ends of the mounting plates, adjusting openings are formed in the ends, close to the mounting plates, of the adjusting assemblies, auxiliary assemblies are arranged on one sides of the adjusting openings, and the auxiliary assemblies are partially located on one sides of the adjusting assemblies. The adjusting efficiency can be improved, namely, the adjusting guide rail and the bearing seat can be cleaned and lubricated, the friction resistance can be reduced, the mechanical efficiency can be improved, and therefore the lifting adjusting effect of the knife line beam is guaranteed, in addition, the multiple functions can be increased, namely, the adjusting guide rail can be cleaned and lubricated while lifting adjustment is conducted on the knife line beam, and the practicability is high. And the multifunctionality of the mechanism is improved.

The invention discloses an energy-saving, consumption-reducing and emergency water supply technology for a secondary water supply pump room, and relates to the technical field of secondary water supply. According to the energy-saving, consumption-reducing and emergency water supply technology for the secondary water supply pump room, all pressurization areas in the secondary water supply pump room are communicated through pipelines, pressure of high-pressure areas is reduced through pressure reducing valves and supplied to the corresponding pressurization areas, and the pressure maintaining and shutdown functions of the pressurization areas are utilized; and meanwhile, the night small flow of the whole community is concentrated on one main pump or one auxiliary pump in a high-pressure area, so that the operation mechanical efficiency of the water pump is improved, and the water consumption per ton is reduced. A pressure reducing valve is modified in the energy-saving device to monitor the pressure of a high-pressure area so as to judge whether the water supply load meets the peak load of a water supply pump or not, and under the condition that the water supply load does not meet the peak load, an electric control valve is utilized to cut off part of the load so as to reduce the peak load, so that the energy-saving device runs well and the secondary protection function is achieved.

The utility model relates to the field of oil well machines, and provides an oil well mechanical efficiency balancing instrument which comprises a bottom plate, an installation table is fixedly installed in the middle of the top face of the bottom plate, a speed reducer is fixedly installed at the top of the installation table, a rotating piece is rotatably installed at one end of the speed reducer, and a door-shaped frame is rotatably installed on the outer side of the rotating piece. The bottom plate is provided with a door-shaped frame, the top of the door-shaped frame is rotatably provided with a walking beam, the middle part of the bottom surface of the walking beam is fixedly provided with a gyroscope, the rear part of the walking beam is slidably provided with a balancing weight, one end of the top surface of the bottom plate is fixedly provided with a motor I through a fixed seat, and a rotating shaft of the motor I is fixedly provided with an eccentric wheel. The gyroscope can monitor the movement process of the walking beam and provide adjustment parameter information for movement of the balancing weight; the first motor can rotate, so that the eccentric wheel rotates to offset large eccentric force of the transmission end, the lower portion of the oil well machine is balanced, and the mechanical efficiency is improved.

The embodiment of the application discloses an underwater power generation device, which comprises a support, an impeller, a plurality of first magnetic members, a gear ring and a plurality of second magnetic members. The support has a mounting port. The impeller is arranged in the mounting port, and the impeller has a gap with the support. The plurality of first magnetic members are uniformly and spacedly arranged on the side of the impeller facing the support, and the magnetic properties of adjacent first magnetic members are opposite. The gear ring is sleeved on the outer side of the support, and the gear ring has a gap with the support. The plurality of second magnetic members are uniformly and spacedly arranged on the side of the gear ring facing the support, and the magnetic properties of adjacent second magnetic members are opposite. When the impeller is impacted by water flow, the impeller rotates relative to the support, the gear ring rotates through the interaction of the first magnetic members and the second magnetic members, the impeller and the gear ring are designed through magnetic suspension, the underwater power generation device can be started at low speed, the energy loss in the transmission process can be greatly reduced, and the mechanical efficiency is improved.

The utility model relates to the technical field of pulse generator production, and discloses a clamping device for pulse generator assembly, which comprises a base and a rotary table positioned above the base, the periphery of the rotary table is fixedly connected with a plurality of assembly tables, and the upper sides of the plurality of assembly tables are fixedly connected with fixing plates and fixing rods. According to the pulse generator shell clamping device, a pulse generator shell is clamped through the first push rod and the second push rod, clamping is simple and rapid, the occupied space is small, the pulse generator shell can be clamped through the first push rod and the second push rod, and the pulse generator shell clamping device is convenient to use, high in practicability and high in practicability. The system error is controllable, the precision of the produced product is high, and the practicability is high.

The invention discloses a hydrogen energy and natural energy heat pump heat supply and refrigeration integrated system and method, and relates to the technical field of hydrogen energy and natural energy heat pump heat supply and refrigeration integration. The heat pump heating module comprises the following steps that S1, carbon dioxide in air is absorbed through a refrigerant or the refrigerant and released into water; the carbon dioxide heat pump is used, and carbon dioxide is a clean refrigerant, has no destructive influence on the environment, is stable in chemical property, non-combustible, not easy to decompose at high temperature, does not generate harmful gas, is non-toxic, reduces threats to people due to leakage, is good in fluidity and has a relatively high evaporation latent heat value; compared with conventional refrigerants, the compression ratio of carbon dioxide is much smaller than that of common refrigerants, high performance coefficient and mechanical efficiency can be achieved, the high condensing temperature enables the exhaust temperature of a compressor to be high, and water at the high temperature can be obtained.