30results about How to "Reduce exhaust temperature" patented technology

The invention relates to a heat pump system and a control method thereof, the heat pump system is provided with a liquid spraying enthalpy increasing branch, a refrigerant in a refrigerant circulation loop can be shunted between a first throttling element and a main path of an economizer, and the refrigerant flows into an air supplementing opening of a compressor through an auxiliary path of the economizer for air supplementing and enthalpy increasing. An air supply throttling element is arranged on the liquid spraying enthalpy increasing branch, and the controller obtains the exhaust superheat degree according to the exhaust temperature and the exhaust pressure, determines the optional adjusting mode of the opening degree of the air supply throttling element according to the exhaust superheat degree and obtains the superheat degree of the economizer according to the side road inlet temperature and the side road outlet temperature. According to the method, the target adjusting mode is determined from the selectable adjusting modes based on the superheat degree of the economizer, the opening degree of the air supply throttling element is controlled through the target adjusting mode, and the reliability of the compressor can be guaranteed while the exhaust temperature is reduced and the refrigerating and heating capacity is improved. And the heat exchange capacity of the economizer can be fully utilized, the refrigerant can be ensured to obtain sufficient supercooling degree, and the heat absorption capacity of the evaporator is improved.

The two-stage compression oil piston type electric air compressor comprises a motor, an air cylinder, an end cover and a box body, the end cover is fixedly installed at the top end of the air cylinder, the air cylinder is fixedly installed at the upper end of the box body, a crankshaft is arranged in the box body, the right side end of the crankshaft is connected with a coupler, and the output end of the motor is connected with the other end of the coupler. A first-stage compression cavity and a second-stage compression cavity are distributed in the air cylinder, pistons capable of moving up and down are arranged in the first-stage compression cavity and the second-stage compression cavity respectively, the bottom end sides of the pistons are connected to the crankshaft, an interstage cooler is fixed between the box body and the motor, an air guide cover is installed at the upper end of the interstage cooler, and a centrifugal fan is fixedly installed on the coupler. The centrifugal fan is located on the inner side of the interstage cooler, the position, located on the first-stage compression cavity, of the air cylinder communicates with the interstage cooling pipe, the interstage cooling pipe extends to the position between the centrifugal fan and the interstage cooler, and the other end of the interstage cooling pipe communicates with a second-stage compression cavity in the air cylinder. The invention has the advantages of simple and reliable structure, high working efficiency, low noise, small vibration and long service life.

The invention discloses an atomization oil injection CO2 scroll compressor under a large pressure difference working condition, and relates to the technical field of compressors, the atomization oil injection CO2 scroll compressor comprises a cylinder body, a lower end cover and a static scroll plate, the lower end cover is connected with the cylinder body through a bolt, a first annular sealing groove is formed in the contact surface of the lower end cover and the cylinder body, and the static scroll plate is connected with the cylinder body through a bolt; a second annular sealing groove is formed in the face, making contact with the barrel, of the static vortex disc, the static vortex disc is located above the barrel, the lower end cover is located below the barrel, the static vortex disc comprises an end plate, an involute type vortex body and a rotational flow cone straight nozzle, the involute type vortex body is composed of the sealing groove and a kidney-shaped exhaust port, and nozzles are symmetrically formed in the end plate. According to the atomization oil injection CO2 scroll compressor under the large pressure difference working condition, the superheat degree of a refrigerant can be reduced, an oil film is formed in a leakage channel, the leakage amount of the refrigerant can be reduced, and therefore the exhaust temperature is reduced, and reliable and efficient operation of the scroll compressor is guaranteed.

The invention relates to a method for controlling air conditioning equipment. According to the method, the heating capacity of the air conditioning equipment when the external environment temperature is too low and the refrigerating capacity of the air conditioning equipment when the external environment temperature is too high are guaranteed by conducting liquid return and / or air return on a compressor. In addition, the invention further relates to the air conditioning equipment, and the air conditioning equipment can execute the method.

The utility model discloses a refrigerator defrosting water evaporation structure which comprises a condenser, a fan, a defrosting water temperature rising disc and an evaporation disc, the defrosting water temperature rising disc and the evaporation disc are stacked up and down, a high-temperature pipe is arranged in the evaporation disc, and the fan conveys hot air generated when the condenser works to the position between the defrosting water temperature rising disc and the evaporation disc and to the position above the defrosting water temperature rising disc. According to the defrosting water evaporation structure of the refrigerator, defrosting water with the temperature ranging from 0 DEG C to 5 DEG C discharged from the refrigerator firstly falls into the defrosting water temperature rising disc on the uppermost layer, the temperature of the defrosting water is increased to be equal to the temperature of the condenser through hot air of the fan, the temperature of the defrosting water is increased greatly at the stage, and part of the defrosting water is evaporated under the action of the hot air.

The invention relates to the technical field of household appliances, in particular to a control method of a heat pump system and the heat pump system, and aims to solve the problem that the safety of a compressor is poor in the two-phase injection circulation process of an existing heat pump system. Therefore, the heat pump system comprises a compressor, a condenser, an economizer, a first expansion valve, an evaporator, a gas-liquid separator, a first branch, a second branch and a second expansion valve installed on the first branch, and the control method comprises the steps that the opening degree of the first expansion valve is controlled so that the superheat degree of the evaporator can be within a first preset interval; the opening degree of the second expansion valve is controlled so that the target temperature difference T can be larger than zero degree and smaller than the set temperature; the target temperature difference T is equal to T1-T2, T1 is the temperature of the mixing point in the compressor, and T2 is the saturation temperature corresponding to the pressure of the branch outlet. Through the control, the mixing point in the compressor can be always in an overheat area, the compressor is protected, and the exhaust temperature of the compressor is prevented from being too high.

The utility model provides a compressor cylinder cover and a compressor. In order to solve the problem that an exhaust cavity of an existing compressor cylinder cover is insufficient in strength and prone to damage, a first supporting arm and a second supporting arm are arranged in the exhaust cavity of the cylinder cover, connection between a boss on the inner wall of the exhaust cavity and a U-shaped groove is established, reinforcing ribs are additionally arranged, the U-shaped groove is supported from three positions, the strength of the U-shaped groove is improved, and the strength of the U-shaped groove is improved. And the damage to the U-shaped groove during exhaust impact is reduced.

The utility model provides a kind of heat pump air conditioning system, including through pipeline connection formation refrigerant circulation loop's compressor unit, four-way valve, first heat exchanger, economizer air supplement structure and second heat exchanger, wherein, compressor unit includes multiple parallelly arranged compressor, and the multiple air supplement pipes of economizer air supplement structure are connected with the air injection port of multiple compressor one-to-one corresponding;The heat pump air conditioning system provided by the utility model is equipped with economizer air supplement structure, and each air supplement pipe of the economizer air supplement structure respectively guides air supplement airflow to the air injection port of each compressor, so that air supplement airflow is mixed with main airflow inside compressor, and then effectively reduces the exhaust temperature of each compressor.

The utility model provides a jet synergy type enhanced vapor injection high-efficiency heat pump, the system is composed of a conventional heat pump module, an enhanced vapor injection module and a jet module, the enhanced vapor injection module comprises a flash tank and a jet electronic expansion valve, and the jet module comprises a jet, an electromagnetic valve and other parts. Refrigerant flashed from the flash tank enters the ejector through the ejection electronic expansion valve and is ejected to a middle pressure cavity of the compressor through the ejector, and the enhanced vapor injection effect is generated. Besides, in order to improve the ejection effect of the ejector and control the working temperature of the compressor, an ejection coil pipe is designed in the gas-liquid separator, high-temperature and high-pressure refrigerants are introduced from the high-pressure side, and heat exchange with return gas refrigerants is achieved in gas separation, so that on one hand, the temperature of the refrigerants in the low-pressure section of a compressor cavity can be increased, and the compressor is prevented from running with liquid; meanwhile, the intermediate cavity temperature and the exhaust temperature of the compressor can be reduced, the whole cavity temperature of the compressor is moderate, and safe and reliable operation of the compressor is guaranteed.

The utility model discloses a double cooling snow making is with sliding vane type air compressor, including mainframe shell, mainframe shell one end installs middle oil cooler, middle oil cooler side surface is connected motor cooling fan, motor cooling fan side surface installs drive motor, drive motor one end is equipped with rear air cooler, middle oil cooler side surface is connected oil gas separator. This double cooling snow making is with sliding vane type air compressor, through installing middle oil cooler in mainframe shell one end, simultaneously in middle oil cooler side surface is connected motor cooling fan, and in motor cooling fan side surface installs drive motor, and the layout is reasonable compact, utilizes motor fan and carries out air cooling, need not for air cooler alone design air duct or installation position, when using, it is more convenient in the snow making site deployment and transportation of limited space, not only reduced manufacturing cost also reduced operating energy consumption, improved the economy and reliability of system.

This utility model discloses a high-efficiency venting structure for die-casting molds, relating to the field of mold technology. It includes: a fixed mold and a moving mold; the fixed mold has a cavity at the top center, and the moving mold has a mold base fixedly installed at the bottom, inserted into the cavity; a venting groove is located at the bottom center of the mold base, and a venting hole penetrating the mold base and the moving mold is located at the top of the venting groove; a venting assembly is located inside the venting groove; and a cooling assembly is fixedly installed at the top of the venting pipe. This utility model achieves automatic venting, preventing molten metal leakage and ensuring venting efficiency. It also extends the flow path of high-temperature gas within the venting stack. Combined with circulating cold water and heat dissipation fins in the water tank, it can quickly absorb gas heat, reduce the venting temperature, prevent direct venting of high-temperature gas from scalding operators, and reduce the impact on the workshop environment temperature.

The embodiment of the utility model provides a kind of water-cooled muffler, relate to silencing device technical field.Water-cooled muffler includes muffler body, inlet pipe, exhaust pipe, inlet pipe and outlet pipe.Water-cooled muffler is provided with sound attenuation chamber and cooling chamber in muffler body.Inlet pipe, exhaust pipe, inlet pipe and outlet pipe are set to the outside of muffler body.Inlet pipe, exhaust pipe and sound attenuation chamber are communicated.Cooling chamber is provided with cooling element.Inlet pipe, outlet pipe are respectively communicated with cooling element.The utility model can cool muffler, reduce exhaust temperature, improve the infrared function of equipment.

The present invention provides a flue gas dust removal and mist elimination heat recovery system, including a flue gas mist elimination heat recovery box, a water storage tank connected to three heat exchangers through water pipes, a spray circulation pump is also provided between the water storage tank and the heat exchanger, the heat exchanger is also connected to a spray pipe, a spray head is provided at the upper end of the spray pipe, and the upper ends of the three spray pipes are respectively located in the primary operation area, the secondary operation area and the desulfurization tower; the outlet pipe of the heat exchanger is also connected to a high-temperature water tank, a preheating water tank, and a coal washing water pipeline, and the high-temperature water tank provides heating water to the outside through a hot water frequency conversion supply pump. Its beneficial effect is that the multi-stage water film spraying in the system can greatly reduce the temperature of the discharged high-temperature flue gas, and the condensed water and the spray water are stored at the bottom of the box body. After heat exchange by the heat exchanger, hot water resources can be provided for various heat-demanding units in the mining area, such as bathing water, heating water, and preheating of gas or water for equipment.

This invention relates to the field of multi-split air conditioning system technology, specifically to a disturbance control method for the outer loop electronic expansion valve of an air conditioning system. The problem this invention addresses is how to actively eliminate oil and refrigerant blockage and reduce exhaust temperature during defrosting or oil return processes through forced disturbance control of the outer loop electronic expansion valve. To solve this problem, this invention provides a control method comprising: acquiring the operating status parameters of the air conditioning system; determining whether the air conditioning system has triggered a disturbance program based on the status parameters; correcting the reference setting based on the exhaust temperature, compressor return superheat, and oil separator return oil temperature during the execution of the disturbance mode; determining whether to exit the disturbance program based on the exhaust temperature and the execution duration of the disturbance program during defrosting and oil return modes; and automatically exiting the disturbance program when the air conditioning system exits the defrosting or oil return mode.

The utility model discloses a kind of heating furnace shell structures with high-efficiency heat insulation interlayer, including radiation chamber, the top of the radiation chamber is provided with convection chamber, the top of the convection chamber is provided with flue gas pipe, the inside of the radiation chamber is provided with waste heat insulation component, vacuum heat insulation component is arranged between the radiation chamber and waste heat insulation component, the inside of the waste heat insulation component is provided with burner;The utility model passes through the interoperation between heat insulation lining, flow-through cavity, fan, heat exchange tube, flow guide pipe and exhaust pipe, so that device can extract airflow and exhaust heat exchange when using, reduce exhaust temperature, exhaust waste heat can be effectively utilized simultaneously, hot gas can pass through flow-through cavity after heat exchange, hot gas can form insulation layer outside combustion chamber at this time, to prevent heat loss, improve the heat insulation performance of device.

The invention provides a thermal barrier coating exhaust passage with an anti-tempering function and an installation method, and relates to the technical field of thermal barrier coatings and diesel engine exhaust passages, the thermal barrier coating exhaust passage comprises an exhaust passage body, the exhaust passage body is coated with a thermal barrier coating, and the thermal barrier coating comprises a first bonding layer, a ceramic layer and a second bonding layer from outside to inside; the first bonding layer and the second bonding layer are made of the same material, an exhaust passage heat exchanger is installed on the exhaust passage body, and a spiral static mixer is installed on the inner side of the exhaust passage body, the exhaust passage with a spiral mixing structure is designed, mixing of incomplete combustion tail gas can be effectively promoted, in addition, a heat exchange channel is arranged on the outer side of the exhaust passage, and the heat exchange efficiency is improved. According to the design, heat transferred to the exhaust passage from the high-temperature cylinder cover can be reduced, heat on the high-temperature wall surface of the exhaust passage can be taken away, and the heat exchange passage and the exhaust passage are combined, so that the temperature of the wall surface of the exhaust passage is effectively reduced, and meanwhile, the situation that the local gas concentration is too high is avoided.

The utility model belongs to the technical field of boiler, concretely relates to a straw bundle direct combustion steam boiler, including furnace body, the furnace body is separated and forms combustion chamber and heat exchange chamber through furnace arch in, and combustion chamber and heat exchange chamber are communicated through the flue gas inlet on the furnace arch, and the combustion chamber includes the gasification chamber and the hearth that arrange in proper order, the heat exchange chamber has the flue gas inlet at the furnace arch and the flue gas outlet at the other end of heat exchange chamber, and the flag type heating surface is arranged in the inside of heat exchange chamber, and the flag type heating surface extends from the inner wall of heat exchange chamber to the middle part of heat exchange chamber, until the flag type heating surface is located in the flue gas flow path of flue gas inlet and flue gas outlet. By setting the flag type heating surface extends from the inner wall of heat exchange chamber to the inside of heat exchange chamber, the flag type heating surface can absorb the heat of the inner wall and the internal flue gas of heat exchange chamber, can effectively reduce the exhaust temperature, improves the heat absorption efficiency to the heat of straw bundle combustion, can also improve the medium temperature in the flag type heating surface, and is convenient for the use of subsequent heat using equipment.

The application relates to a fresh air dehumidification heat pump system based on a new compressor series-parallel transformation step suction and exhaust, a refrigerant circulation flow path comprising a first air inlet coil, a first throttling device, a supply air coil, a first check valve, a return air coil, an exhaust air coil, a first four-way reversing valve and a first compressor which are sequentially connected; further comprising a second four-way reversing valve, a second compressor, a second air inlet coil and a second throttling device which are sequentially connected; further comprising a second check valve which is connected in parallel to the two ends of the supply air coil and the first check valve; the transformation of the series-parallel relationship of the compressors in the cold / heat mode is realized through the first four-way reversing valve and the second four-way reversing valve, so that the step suction / step exhaust forms correspondingly. Compared with the prior art, the two four-way reversing valves are switched skillfully, the switching of the two compressors in series and parallel is completed in the refrigeration and heating modes, and the switching of the step suction and the step exhaust is further realized, so that the unit performance is improved.

The utility model provides a sectional type big temperature difference water source heat pump unit relates to heat pump unit technical field, including heat pump module, heat pump module includes first stage heat pump unit and second stage heat pump unit, and each stage heat pump module is equipped with cold water inlet and hot water inlet, and cold water inlet and hot water inlet all are connected to external water source pipeline through mechanical valve group, and mechanical valve group contains series connection mode interface and parallel mode interface, and through manual operation switches waterway series connection topology structure. The utility model has realized through the cold water inlet, hot water inlet of each stage heat pump module through mechanical valve group connection, and contains series connection and parallel interface and switches waterway through valve handle operation, and when series connection, low temperature water source flows through multistage evaporator and gradually reduces temperature, and when parallel, high temperature water source shunts to each stage evaporator, adapts small temperature difference demand, reaches the effect of improving application range, increases energy efficiency.

The utility model provides a kind of compressor screw rod and screw rod compressor, air conditioner, wherein compressor screw rod includes stem and the rotor of being located stem, rotor inside is equipped with between its suction end and the liquid supply passage extending of exhaust end, and several through the liquid injection passage of tooth groove surface and liquid supply passage, liquid injection passage includes the liquid outlet section and liquid inlet section of connecting tooth groove surface and liquid supply passage respectively and the variable diameter section of connecting liquid outlet section and liquid inlet section;Compressor screw rod further includes movable stop block, is located in variable diameter section and is connected in liquid injection passage interior by reset piece, movable stop block size is greater than the size of liquid outlet section and variable diameter section junction and liquid inlet section and variable diameter section junction;In the process that tooth groove rotates cyclically with rotor and inhales and exhausts, movable stop block reciprocates between liquid outlet section and liquid inlet section to open and close liquid injection passage under the differential pressure change of liquid outlet section and liquid inlet section and the action of reset piece, realize that the volume between rotor teeth from suction to the end process of internal compression is uninterrupted, and liquid injection is adaptively changed with the differential pressure of two sides.

This invention belongs to the field of refrigerant technology and discloses a mixed refrigerant and its application. The mixed refrigerant is composed of two or three of ethane, propane, propylene, and difluoroethane. When ethane is included, its mass percentage in the mixed refrigerant does not exceed 10%, or is between 21% and 50%. When difluoroethane is included, its mass percentage is between 65% and 85%. This invention, by improving the composition and proportion of each component of the mixed refrigerant, solves the technical problems of high GWP values, low energy efficiency, low volumetric refrigeration capacity, and poor refrigeration performance associated with existing refrigerants. It can be used to replace R32 or R290, has a low exhaust temperature, high volumetric refrigeration capacity, and requires less refrigerant charge, and can be used to replace high GWP refrigerants such as R32 and R410A.

The utility model discloses a refrigeration system and refrigeration equipment, and belongs to the field of refrigeration. The refrigerating system comprises a compressor and a heat exchanger. The heat exchanger comprises a first heat exchange pipe and a second heat exchange pipe, an inlet of the first heat exchange pipe is connected with an exhaust port of the compressor, the second heat exchange pipe comprises a first pipe part and a second pipe part which are located on different side faces of the box body, an outlet of the first pipe part is connected with an inlet of the second pipe part, and an outlet of the second pipe part is connected with an outlet of the compressor. An outlet of the second pipe part is connected with an air suction port of the compressor, at least part of the first pipe part and at least part of the first heat exchange pipe are located on the same side face of the box body, and at least part of the first pipe part is arranged on one side of the first heat exchange pipe so as to exchange heat with the first heat exchange pipe. The temperature of the refrigerant entering the inlet of the compressor can be reduced, so that the exhaust pressure of the refrigeration system in a steady state is reduced, and noise is reduced.

The present invention discloses a dry oil-free screw compressor and a control method thereof, wherein the dry oil-free screw compressor comprises at least two-stage screw compression assemblies and a condensate separation and distribution mechanism; the first screw compression assembly is a low-pressure screw compression assembly, the second screw compression assembly is a secondary-pressure screw compression assembly; the third screw compression assembly is a high-pressure screw compression assembly; the condensate separation and distribution mechanism is connected to the air outlet of the compressed air terminal cooler to separate the condensate in the compressed air; the condensate separation and distribution mechanism transports the separated condensate to the rotor chambers of the second and third screw compression assemblies, where it is cooled and sealed, and the excess condensate is discharged. The dry oil-free screw compressor and the control method thereof proposed by the present invention can reduce the exhaust temperature, reduce the leakage of compressed gas, and reduce the specific power.

The invention relates to the technical field of heat pump systems, in particular to a whole vehicle heat management method based on an injection type air supply enthalpy increasing heat pump. A traditional air-supplementing enthalpy-increasing heat pump system is complex in structure and cannot carry out effective and controllable heat exchange with various vehicle-mounted functional parts in a whole vehicle heat management system. In order to solve the problem, the invention provides the whole vehicle thermal management method based on the injection type air supply and enthalpy increase heat pump, and a stable air supply and enthalpy increase loop is constructed in a heat pump system. And the medium-pressure gaseous refrigerant in the gas-liquid separator continuously performs enthalpy increasing and gas supplementing on the compressor. Meanwhile, a heat pump system is deeply coupled with a whole vehicle heat management system, the temperature states of vehicle-mounted functional components such as an electric drive module, a battery module and a cabin module can be collected in real time through a central integration module formed by a heat management controller and a temperature sensor, and heat is dynamically distributed according to actual requirements.

The application belongs to the technical field of air supercharging and provides a machine head of a piston type full-oil-free supercharger, which comprises a body and at least one cylinder arranged along the radial direction of the body, the body and the cylinder are arranged as a hollow chamber structure surrounded by a side wall, the cylinder comprises a first cylinder, a second cylinder, a third cylinder, a fourth cylinder, a fifth cylinder and a sixth cylinder, wherein the first cylinder, the second cylinder, the third cylinder and the fourth cylinder, the fifth cylinder and the sixth cylinder are arranged to be uniformly distributed along the radial central axis of the body, and the axes of the first cylinder and the fifth cylinder coincide as a straight line, and the axes of the second cylinder and the sixth cylinder coincide as a straight line. The application adopts a six-cylinder design, has strong power balance, low vibration, large heat dissipation area, high exhaust volume and efficiency, and can easily realize a multi-stage compression structure to provide high supercharged gas.

The utility model relates to a kind of air-cooled heat pump cooling devices, its innovation point is at:Including cooling unit and cooling water softening unit, the cooling unit includes water replenishing pipe and the filter, solenoid valve, pressurized water pump and universal atomizing nozzle being arranged on water replenishing pipe, the filter is close to the water inlet end of water replenishing pipe, the water outlet end of water replenishing pipe is equipped with the universal atomizing nozzle cooling the condenser of heat pump, the cooling water softening unit includes soft water equipment, first, second and third manual valve, the first manual valve is equipped on water replenishing pipe, and the first and second bypass branch pipes are equipped with with water replenishing pipe intercommunication on the two sides of first manual valve, the first bypass branch pipe is connected with the water inlet of soft water equipment, and is equipped with second manual valve, the second bypass branch pipe is connected with the water outlet of soft water equipment, and is equipped with third manual valve.The utility model can effectively reduce hot cold condenser temperature in high temperature season, improve heat pump refrigerating capacity, to ensure operating room constant temperature and humidity clean environment.

The present application discloses a heat transfer composition, which includes HFC-32, HFC-125, HFC-134a, HFO-1234yf, HFC-152a; or includes HFC-32, HFC-125, HFC-134a, HFO-1234yf, CF3I, and has a GWP value of less than 1500. It can directly replace R-404A in a heat transfer system designed for R-404A without changing any components, and has excellent refrigeration effect in low-temperature freezing, fast cooling rate and low energy consumption.

The invention belongs to the technical field of refrigerants, and discloses a mixed refrigerant and application thereof, the mixed refrigerant is composed of two or three of ethane, propane, propylene and difluoroethane; when the component contains ethane, the mass percent of the ethane in the mixed refrigerant is not more than 10% or 21-50%; when difluoroethane is contained in the components, the mass percent of the difluoroethane in the mixed refrigerant is 65-85%. By improving the components of the mixed refrigerant and the proportion of all the components, the technical problems that an existing refrigerant is high in GWP value, low in energy efficiency and low in refrigerating capacity per unit volume and affects the refrigerating performance can be solved, and the mixed refrigerant can be used for replacing R32 or R290, is low in exhaust temperature, large in refrigerating capacity per unit volume and small in refrigerant charging amount and can be used for replacing R32 refrigerants, R410A refrigerants and other high GWP refrigerants.

The application relates to a valve timing system of a V-type two-cylinder four-valve engine. The application comprises cylinder blocks arranged in a V type, cylinder heads arranged on two sides of the cylinder blocks respectively, two intake valves and two exhaust valves arranged on each cylinder head respectively, a combustion chamber of the cylinder head being a pinnacled combustion chamber, an air inlet of the cylinder head being arranged at the front end of the engine, an exhaust port of the cylinder head being arranged at the rear end of the engine, and a space for accommodating a valve timing system being formed in the middle of the engine; the valve timing system comprises a camshaft arranged in the middle of the cylinder block and driven to rotate by a crankshaft, four cams arranged on the camshaft in the axial direction, four tappets, four push rods, one end of each push rod being movably connected with a corresponding tappet, and a rocker arm mechanism comprising two rocker arm seats oppositely arranged on each cylinder head and intake rocker arms and exhaust rocker arms rotatably arranged on each rocker arm seat. Under the premise of meeting various requirements of the vehicle level, high performance, small size and low cost of the engine are realized.

The invention discloses an integrated and high-reliability engine cooling system arrangement structure, and belongs to the technical field of engine cooling systems. The problems that a traditional engine cooling system is extensive in heat management, slow in engine warming, high in energy consumption, poor in operation condition adaptability, high in accessory power consumption and insufficient in cooling reliability of high-heat-load components are solved. Comprising a large cycle, an oil cooler small cycle, a warm air small cycle, a supercharger small cycle, an EGR small cycle, a cylinder body and cylinder cover small cycle and a degassing small cycle. An EGR cooler in the EGR small cycle is arranged above an engine cylinder cover, high-point gas of a cylinder cover water jacket enters the EGR cooler through an EGR cooler water inlet pipe and then enters a whole vehicle expansion kettle through an engine degassing connecting pipe nozzle integrated on an EGR cooler water outlet pipe, and degassing is completed. According to the invention, rapid warming-up, accurate cooling as required and parasitic power consumption reduction can be realized, and the problem of gas management in a complex loop is fundamentally solved, so that the harsh requirements of a next-generation high-performance and low-emission engine are met.