662 results about "Crankcase" patented technology

The invention provides a ribbon loom driven by horizontally opposed crankshafts, which comprises a base rack provided with a crankcase, a crankshaft driving assembly is arranged in the crankcase and drives a heald frame opening mechanism through a connecting rod, and a cloth tape winding mechanism, a weaving mechanism and a weft yarn feeding mechanism are further arranged above the crankcase. The crankshaft driving assembly comprises a rear crankshaft set and a front crankshaft set which are horizontally and oppositely arranged, a first synchronous wheel and a second synchronous wheel in the rear crankshaft set are connected through a rear main shaft piece, and a driving belt wheel is installed on a motor piece and connected with the first synchronous wheel through a first synchronous belt. The front crankshaft set and the rear crankshaft set are driven to rotate synchronously, all heald frame openings in the heald frame opening mechanism operate synchronously according to the preset opening rhythm, openings are formed through the heald frame set, the openings reach the weaving mechanism to be woven into cloth belts, and then the cloth belts are wound into a container through the winding mechanism. The vibration and noise of the machine are reduced, and the overall processing efficiency of the ribbon loom is improved.

The utility model provides a transmission mechanism of an air compressor, and belongs to the technical field of air compressors. The technical problem that the temperature in an existing crankcase is prone to rising is solved. A transmission mechanism of an air compressor comprises a crankcase internally provided with a containing cavity, a driving motor is fixedly connected to the crankcase, the driving motor comprises a motor shaft, one end of the motor shaft extends into the containing cavity, air cylinders are fixedly arranged on the two sides, perpendicular to the driving motor, of the crankcase respectively, two eccentric wheels are fixedly connected to the motor shaft, and the two eccentric wheels are fixedly connected to the crankshaft. The two eccentric wheels are fixedly sleeved with bearings respectively, the two bearings are fixedly sleeved with connecting rods respectively, the ends, away from the motor shaft, of the connecting rods are fixedly connected with pistons, and the pistons are located in the air cylinder. The air compressor is fast in heat dissipation and high in efficiency.

The utility model relates to the technical field of reciprocating plunger pumps, and provides a plunger pressing sleeve assembly of a reciprocating plunger pump, which comprises a pressing sleeve, one end of the inner wall of the pressing sleeve is provided with a limiting part, and one side of the limiting part is sleeved with a spring and a sealing filler which are tightly attached to the inner wall of the pressing sleeve; through the wave spring, the sealing performance is improved, and the abrasion loss of a sealing material is compensated; the structure is simple, the dismounting efficiency is high, and the maintenance cost and time are reduced; the leakage flow direction is changed, and emulsification of crankcase lubricating oil is avoided; the device is made of a high-strength material, and is good in compression resistance and corrosion resistance.

An internal combustion engine for a vehicle includes: a crankshaft; a balancer shaft that is connected to the crankshaft and is rotated by rotational power transmitted from the crankshaft; a crankcase including a crank chamber that accommodates the crankshaft and the balancer shaft; and a filler that fills a space around the balancer shaft in the crank chamber and is a member different from a wall surrounding the crank chamber.

The utility model discloses a compressor and electrical equipment, the compressor comprises a shell, an outer exhaust pipe, a crankcase, a first gas path, a second gas path and at least one silencer, the crankcase is provided with at least two buffer cavities; the first gas path comprises one buffer cavity or a part of buffer cavities which are communicated in sequence; the second gas path comprises another buffer cavity or another part of buffer cavities which are communicated in sequence; the first gas path and the second gas path are sequentially communicated with the external exhaust pipe; or the first gas path and the second gas path are connected in parallel and are respectively communicated with the external exhaust pipe; wherein a connecting pipe is connected between every two adjacent buffer cavities which are communicated with each other, a connecting pipe is connected between the buffer cavity and the outer exhaust pipe which are communicated with each other, and at least one connecting pipe is connected with a silencer. The compressor can reduce exhaust pulsation and improve stability of exhaust airflow, and therefore vibration and noise are reduced.

A first passage communicating a portion downstream side of the compressor in the intake passage and an upstream side of the intercooler with the crankcase, a second passage communicating a portion downstream of the intercooler in the intake passage with the crankcase, and a third passage communicating a portion upstream of the compressor in the intake passage with the crankcase are installed in the turbocharged engine, and a switching valve for switching between a state in which the first passage communicates and the second passage is blocked, and a state in which the first passage is blocked and the second passage communicates is provided.

The utility model discloses a novel compressor main machine head structure which comprises a crankcase, a crankshaft disc, a connecting rod, a piston and a cylinder body. A plurality of cylinder bodies are evenly distributed on the outer circumferential face of the crankcase in the circumferential direction of the crankcase at intervals, and each cylinder body is arranged in the radial direction of the crankcase. The crankshaft disc is arranged in the crankcase and coaxially connected to the crankshaft in a sleeving mode. Connecting rods are further arranged on the outer circumferential face of the crankshaft disc in the radial direction corresponding to the positions of the cylinder bodies, one end of each connecting rod is hinged to the crankshaft disc in the circumferential direction of the crankshaft disc, a lining is further arranged at the hinged joint of the connecting rods and the crankshaft disc, and the abrasive resistance of the hinged joint is enhanced through the lining. The other end of each connecting rod is provided with a piston matched with the connecting rod, and the pistons are driven to move in the corresponding cylinder bodies in a reciprocating mode. The compressor is simple in structure, the multiple cylinder bodies are arranged at intervals in the circumferential direction, the transmission distance of the crankshaft can be effectively shortened, and therefore the size of the compressor is reduced, and the occupied area is reduced.

The application discloses a hydrogen engine crankcase hydrogen concentration control method, and relates to the field of hydrogen engines, which comprises the following steps: placing a hydrogen engine on a test bench to test, obtaining a target hydrogen concentration, an actually measured hydrogen concentration and a crankcase blow-by amount; calculating a target working condition supplementary air amount according to the target hydrogen concentration, the actually measured hydrogen concentration and the crankcase blow-by amount; generating a full working condition supplementary air amount database according to the target working condition supplementary air amount, based on the rotating speed and the load of different working conditions; obtaining the fresh air amount required to be supplemented by a current target working condition according to the full working condition supplementary air amount database; obtaining an intake air pressure, an intake air temperature and a crankcase pressure; combining the intake air pressure, the intake air temperature and the crankcase pressure to calculate a throttle opening degree; comparing the hydrogen concentration measured by a hydrogen concentration sensor according to the current target working condition with the target hydrogen concentration to obtain a hydrogen concentration deviation; generating a corrected fresh air amount; and performing closed-loop control on the actual crankcase hydrogen concentration by adjusting the throttle opening degree.

This invention relates to the field of high-pressure washer technology, and discloses a flow channel, pump head, and high-pressure washer housing. The housing includes a power chamber, a motor chamber, and a control chamber. A crankshaft cover for sealing the power chamber and a motor cover for sealing the motor chamber are fixed to the housing, with the crankshaft cover and motor cover located on opposite sides of the housing. The flow channel comprises a reciprocating circular flow channel and a power chamber flow channel. The housing has an inlet connected to the inlet of the reciprocating circular flow channel, an outlet connected to the inlet of the power chamber flow channel, and an outlet connected to the outlet of the power chamber flow channel. This flow channel achieves both the guiding of cleaning water and the cooling of the equipment. As the cleaning water flows through the flow channel, it simultaneously dissipates heat from the core systems of the high-pressure washer, including its power, control, and transmission systems, simplifying the overall structure of the equipment and improving space utilization.

The present disclosure provides an engine oil cooling structure of an engine. In the engine oil cooling structure of an engine, the engine includes a crankcase, the crankcase is provided with an oil filter mounting chamber having a cylindrical shape, the cooling structure includes a water channel, a water inlet of the water channel communicates with a water pump, the crankcase is further provided with a main oil channel, the crankcase is further provided with a heat conducting thin wall, an inner cavity of the heat conducting thin wall form the oil filter mounting chamber, the oil filter mounting chamber communicates with the main oil channel, the water channel is arranged around an outer side wall of the heat conducting thin wall, and a water outlet of the water channel communicates with a cooling water channel arranged in the same direction as and adjacent to the main oil channel.

This utility model belongs to the technical field of motorcycle parts, and relates to an oil cooling structure for a motorcycle engine. It includes a crankcase, in which a crankshaft is housed and filled with engine oil. One end of the crankshaft extends out of the crankcase and is fitted with a fan. The fan is covered by a fan shroud, the outer end of which has an axial air inlet and a circumferential air outlet on its side wall. Several cooling fins are arranged on the side of the crankcase near the fan shroud. The inner side of the cooling fins contacts the engine oil and transfers heat, while the outer side is covered by a radial extension of the fan shroud. An air outlet communicating with the air outlet is provided on the radial extension of the fan shroud. The oil cooling structure for a motorcycle engine provided by this utility model can significantly improve the oil cooling effect of the engine.

The utility model relates to the technical field of engine oil pan, especially a leakage-proof structure of in-line piston engine, an engine and an aircraft, including setting in the oil pan of engine crankcase body subassembly lower part, the oil pan forms a basin -like structure of one inner bottom surface basically level, the inner bottom surface of oil pan is concave downward and forms the oil storage groove that the structure is further outward protruding relative to the outer bottom surface of oil pan, the outer bottom surface of oil pan and the outside wall between oil storage groove smooth transition, the sealing edge contact surface of oil pan and engine crankcase body subassembly connection is wide side design, and is installed on the sealing edge contact surface with wide -side sealing pad, and the width of wide -side sealing pad is greater than the width of sealing edge contact surface, the utility model simplifies the structure, makes can adapt to the large inclination angle of aircraft ±45 DEG movement, greatly reduces the oil leakage risk simultaneously.

This invention provides a compressor and a refrigeration device. The compressor includes: a crankcase, which includes a cylinder block and a flow passage; a first exhaust buffer chamber, a second exhaust buffer chamber, a first connecting hole, and a second connecting hole. The first exhaust buffer chamber is connected to the flow passage, and both ends of the first connecting hole are connected to the first exhaust buffer chamber and the second exhaust buffer chamber, respectively. The two ends of the second connecting hole are also connected to the first exhaust buffer chamber and the second exhaust buffer chamber, respectively. A flow-dividing structure is disposed within the first exhaust buffer chamber. The flow-dividing structure includes a first flow-dividing surface and a second flow-dividing surface. The first flow-dividing surface and the cavity wall of the first exhaust buffer chamber form a first flow-dividing channel, and both ends of the first flow-dividing channel are connected to the flow passage and the first connecting hole, respectively. The second flow-dividing surface and the cavity wall of the first exhaust buffer chamber form a second flow-dividing channel, and both ends of the second flow-dividing channel are connected to the flow passage and the second connecting hole, respectively. This design achieves flow-dividing and noise reduction while improving the compressor's cooling capacity.

The utility model discloses an anti-icing electric heating crankcase ventilation pipe, and relates to the technical field of ventilation pipes, the anti-icing electric heating crankcase ventilation pipe comprises a heating assembly, and the heating assembly is used for heating the ventilation pipe; the protection assembly is compounded on the outer side of the heating assembly, and the protection assembly is used for protecting the heating assembly; the heating assembly comprises a protection assembly and a stabilizing assembly, the stabilizing assembly is arranged on the outer side of the protection assembly and used for improving the stability of the protection assembly, the heating assembly comprises a ventilation pipe, a plurality of mounting grooves are formed in the center of the surface of one side of the ventilation pipe, and the multiple mounting grooves are each provided with an electric heating wire. According to the utility model, the ventilation pipe can be heated, and the stability of the ventilation pipe can be improved, so that the outer surface of the pipeline can be prevented from being damaged, and the service life of the pipeline can be prolonged.

The utility model discloses a motorcycle engine with a small circulating pipe arrangement structure, and aims to overcome the defect that in the prior art, at least two sets of motorcycle engine structures with different structures need to be produced in the manufacturing process to adapt to motorcycles of different versions, and the manufacturing cost of the motorcycle engine is increased. The technical problem is solved through the following technical scheme that the crank case comprises a crank case, a liquid inlet cavity and a liquid return cavity are formed in the crank case, an installation cavity communicated with the liquid return cavity is further formed in the crank case, one end of the installation cavity is communicated with a water outlet pipe, and the other end of the installation cavity is communicated with a small circulation end pipe; a thermostat is arranged in the mounting cavity and controls communication among the small circulation end pipe, the water outlet pipe and the mounting cavity; and a plugging section is arranged in the small circulation end pipe.

The utility model discloses a limiting structure for a water pipe of an oil cooler of a motorcycle engine, and aims to solve the problem that in the prior art, the water pipe of the oil cooler is fixed through a wire clamp, and the wire clamp is easy to age and fall off after being used for a long time. According to the technical scheme, the crankcase fixing structure comprises a crankcase, a fixing structure is arranged on the crankcase and comprises a fixing rod, one end of the fixing rod is fixedly connected with the crankcase, and the other end of the fixing rod is connected with an engine hanging point; the fixing rod and the crankcase are matched to form a fixing hole, and the oil cooler water pipe is arranged in the fixing hole in a penetrating mode. The fixing structure is matched with one engine hanging point to form the fixing hole, the oil cooler water pipe penetrates through the fixing hole, and the oil cooler water pipe is fixed through the fixing hole, so that the trouble of fixing the oil cooler water pipe through a wire clamp is omitted, and the overall structure can be more compact.

An oil pan forms a bottom portion of a crankcase of an engine. A partition wall extends upwardly from a bottom surface of the oil pan. The partition wall partitions an inside of the oil pan into a first region in which engine oil is stored and a second region in which the engine oil is not stored. An opening of an air introduction passage is arranged in the second region. The air introduction passage guides air from an intake passage to the crankcase for ventilation.

The invention relates to the technical field of motorcycles and accessories thereof, and discloses a double-cylinder engine 170-degree arrangement structure which comprises a crankcase, two air cylinder assemblies are arranged on the crankcase, two air cylinder holes are symmetrically formed in the two sides of the crankcase, air cylinders are connected through the two air cylinder holes respectively, a crankshaft is arranged in the crankcase, and the crankshaft is connected with the two air cylinder assemblies. Pistons are arranged on the inner walls of the air cylinder assemblies in an attached and sliding mode, transmission is conducted between the pistons and the crankshaft through connecting rods, the included angle between the two air cylinder assemblies is 170 degrees, backflow of lubricating oil is facilitated through 170-degree V-shaped double-cylinder arrangement, and the space in the vertical direction can be saved. The problems that the sealing performance is poor and oil leakage is serious due to the fact that existing equipment is inconvenient to return oil are solved.

The invention discloses an active crankcase negative pressure breathing device of an engine. The active crankcase negative pressure breathing device comprises a breathing device shell installed on a crankcase through a crankcase cover plate and an oil-gas separation device. A flow dividing type centrifugal filter device is installed in the respirator shell. The centrifugal filter device is driven by engine oil pressure of an engine to rotate, and the centrifugal filter device synchronously drives a fan device capable of pumping out mixed oil gas in a crankcase. Mixed oil gas discharged by the fan device can enter the oil-gas separation device to be decelerated, condensed and separated. Separated gas is discharged into the atmosphere, and condensed oil flows back into the crankcase; an oil supply hole channel used for providing press oil is formed in the bottom of the respirator shell, and an oil quantity control device capable of automatically adjusting the opening degree of an oil inlet according to the change of the pressure of the oil is installed in the oil supply hole channel. The device is simple in structure, safe and reliable, and the negative pressure in the crankcase can be always kept in a stable interval.

The invention provides a two-stroke air entrapment direct injection methanol engine. The two-stroke air entrapment direct injection methanol engine comprises an air cylinder body crankcase assembly, a crankshaft assembly, an engine oil lubricating assembly, an air inlet assembly, an oil supply assembly, a starting assembly, an air pump assembly and a control assembly. According to the application, the methanol use environment is met by adopting the design of internal preheating and combustion chamber preheating of the special fuel pump for methanol and heat energy generated by air compression in the fuel rail, and fuel atomization is promoted by gas pressure and high-speed flow generated by air compression of the direct-connected air pump assembly through a gas-entrained injection technology; meanwhile, uniform mixing of gas and fuel oil is enhanced, homogeneous combustible mixed gas is more easily formed in the combustion chamber, the first-stage fuel oil pump and the second-stage fuel oil pump are connected in series, and the stability of the using pressure of methanol fuel oil is effectively guaranteed; according to the preheating function, the engine can rapidly enter the optimal working temperature in the low-temperature environment during low-temperature starting and low-temperature operation, and therefore the emission performance and the working performance of the engine are improved.

The tool assembly comprises a base and a plurality of machining positions, each machining position comprises a limiting base, a front side pressing structure and a rear side pressing structure, each front side pressing structure comprises a front side oil hydraulic cylinder and a front side pressing head, and each rear side pressing structure comprises a rear side oil hydraulic cylinder and a rear side pressing head. A machining window is formed in the bottom of the limiting seat, a hollowed-out part is arranged on the base, the machining window corresponds to the hollowed-out part, the limiting seat is covered with the bottom of the crankcase in a buckled mode, the front side pressing head abuts against the edge of the front end of the crankcase in a pressed mode, the rear side pressing head abuts against the edge of the rear end of the crankcase in a pressed mode, the distance between every two adjacent machining positions is D, and the length of the base is L, the contact length of the front side pressure head and the crankcase is L1, the contact length of the front side pressure head and the crankcase is L2, the contact length of the rear side pressure head and the crankcase is L3, the contact length of the rear side pressure head and the crankcase is L4, and D is equal to a * L, L1 is equal to b * L2, and L3 is equal to c * L4. A plurality of machining positions are arranged, a plurality of crankcases can be machined, the replacing time of the crankcases is shortened, and the working efficiency is improved.

The utility model relates to the technical field of emulsion pumps, in particular to a crankshaft lubricating mechanism for an emulsion pump, which comprises a crankshaft box, a first connecting pipe, a cooling box and a lubricating auxiliary component. One side of the crankcase is connected with a cooling box through an arranged first connecting pipe, and cooling liquid is arranged in the cooling box. The first connecting pipe in the cooling box is connected with the connecting pump, the other end of the connecting pump is connected with the second connecting pipe, and the lubricating auxiliary assembly is arranged on the crankcase. Through cooperative use of the lubricating auxiliary assembly arranged in the crankcase, the arranged cooling box, cooling liquid, the connecting pump and other structures, heated lubricating oil in the crankcase enters the cooling box through the first connecting pipe to be cooled and then is conveyed to the oil storage pipe in the crankcase to be sprayed out through the oil outlet for lubrication; and the arranged rotatable oil storage pipe can spray oil in a larger area, cold oil lubrication and cooling can be continuously achieved, and the actual use requirement is met.

The utility model relates to the technical field of power systems, in particular to an engine. The engine (100) comprises a shell assembly (10), a crank connecting rod mechanism (50), an air distribution mechanism (40), a speed change mechanism (60), a first cylinder body (74), a second cylinder body (75) and a starting motor (80). The shell assembly (10) comprises a crank case (14), at least part of the crank connecting rod mechanism (50) is installed on the crank case (14), and the air distribution mechanism (40) and the speed change mechanism (60) are both connected with the crank connecting rod mechanism (50). The first cylinder body (74) is arranged in the first direction, the second cylinder body (75) is arranged in the second direction, the first direction and the second direction intersect in an inclined mode and form a preset included angle, and at least part of the starting motor (80) is arranged in the range of the included angle formed by the first direction and the second direction.

A piston compressor for compressing a gas, which can be separated from a drive unit by means of a coupling (3), comprising an inlet valve (21) arranged between an inlet line (22) for gas to be compressed and a compression chamber (17) of the piston compressor (10), and an outlet valve (26) arranged between the compression chamber (17) of the piston compressor (10) and an outlet line (27) for compressed gas, characterized in that the piston compressor (10) has a venting device (31, 32, 33, 34, 35, 36, 37, 39) through which compressed gas, which flows back into the compression chamber (17) from the outlet line (27) during the separation of the piston compressor (10) from the drive unit, can be discharged from the compression chamber (17), wherein the compressed gas is removed from the compression chamber (17) can be discharged into an area with ambient pressure which is independent of the environment itself,a gas space (22, 24) connected to the inlet system (23) or the interior of the crankcase (16), wherein a permanently open vent channel (34, 35, 36, 39) forms the venting device, wherein at least one end of the vent channel (34, 35, 36, 39) is arranged in the valve plate (20), wherein the vent channel has such a small cross-section that pressure equalization of the compression chamber 17 with the area at ambient pressure takes place through the vent channel such that the gas volume flow that can be discharged from the compression chamber during a separation of the compressor from the drive device is at least as large as the gas volume flow of compressed gas from the outlet line that returned to the compression chamber during this period.However, the throttling effect of the small cross-section of the venting channel limits the volume flow of air discharged through the venting channel into the area of ​​ambient pressure during a compression stroke.

The application discloses a V-type diesel engine body structure, which comprises a body, at least two camshaft holes, a main oil passage for providing lubricating oil for the camshaft in the camshaft hole, two water distribution passages and two water collecting passages, the two water collecting passages are connected with water outlets at the front end of the body respectively, camshaft chambers are arranged on both sides of the camshaft hole on the body, the camshaft chambers are connected with lower cooling cavities of cylinder sleeves through splash oil and oil gas inlets, the lower cooling cavities of the cylinder sleeves are connected with crankcase cavities through splash oil return gaps, and the camshaft chambers are connected with the crankcase cavities. The structure of the application is divided into upper and lower parts for cooling, and the upper part is cooled by cooling liquid; since the lower part of the cylinder sleeve has small thermal load, the structure of the application uses non-forced cooling, splash oil and oil gas splashed by rotation of camshaft bearings are used to cool the lower part of the cylinder sleeve in a small amount, so that appropriate benefits are achieved, and excessive cooling to cause engine heat loss is avoided.

A liquid nitrogen pump power end assembly relates to the technical field of liquid nitrogen pumps and comprises a crankshaft box body, a crankshaft, a connecting rod and a crosshead assembly. A plurality of wallboards are arranged in the crankshaft box body, crankshaft bearing seats are mounted on the wallboards, a plurality of reinforcing ribs are fixedly arranged between the crankshaft bearing seats and the wallboards, and the crankshaft is rotationally mounted in the crankshaft bearing seats through crankshaft bearings; the crankshaft comprises a straight shaft and an eccentric wheel, the straight shaft penetrates through the crankshaft bearing seat, and the eccentric wheel is mounted on the straight shaft and connected with the connecting rod; the crosshead assembly comprises a crosshead, the inner end of the crosshead is connected with the connecting rod, the outer end of the crosshead is arranged as a mounting end, and a clamping assembly is mounted at the mounting end; the clamping assembly comprises two oppositely-arranged clamping hook pieces, and the distance between the two clamping hook pieces is adjustable in the radial direction of the installation end. The mechanical strength of the crankcase body can be improved, and the gradually-increased operation pressure in China can be met; and the device can be connected with fluid ends of various models, and the installation application range is expanded.

The utility model discloses a combination valve for realizing exhaust gas recirculation in a crankcase, which comprises a shell I with a venturi structure, the shell I is provided with a port I, a port II and a port III with a three-way structure, the port I and the port II are coaxially arranged, and the port III is arranged in a paraxial manner; the first port is connected with a second shell used for being connected with an engine, the second port is connected with a third shell used for being connected with a supercharger, a valve element and a spring arranged on the valve element in a sleeving mode are arranged between the third shell and the first shell, and the third port is connected with a fourth shell used for being connected with a crankcase. According to the combination valve structure provided by the utility model, under a certain special working condition of a hybrid vehicle with an engine, waste gas in a crankcase can be subjected to waste gas recirculation (entering the engine to be combusted again) so as to conform to the national sixth emission regulation, and the combination valve structure has the advantages of lower cost, more convenience in maintenance, smaller occupied space in the vehicle and the like.

The invention relates to the technical field of engine crankshafts, in particular to a split type two-stroke engine crankshaft which comprises a cylindrical front end shaft with one axial end being a free end and the other end extending in the axial direction; the second crank is of a disc-shaped structure, the end face of one side of the second crank is coaxially and fixedly connected with the end face of the extending end of the front end shaft, and the diameter of the second connecting rod journal is smaller than that of the second crank; and the vent holes adopt a double-hole design of which the aperture is 10mm and the vent holes are symmetrically distributed at 180 degrees in the circumferential direction, so that the crank case is effectively communicated with the inner spaces on the axial front and rear sides of the connecting rod journal. When the engine runs, the crankshaft rotates at a high speed, and the vent hole synchronously rotates along with the crankshaft to form a'dynamic flow guide channel ': when the piston moves downwards to increase the pressure of the cavity on one side, high-pressure gas can quickly flow to the low-pressure cavity through the vent hole, so that excessive accumulation of local pressure is avoided; when the piston moves upwards to form negative pressure, the low-pressure cavity can supplement gas from the high-pressure cavity through the air hole, and pressure dynamic balance under all working conditions is achieved.

The utility model provides a novel air compressor, and belongs to the technical field of machinery. The air compressor solves the problems that when an existing air compressor compresses air, pollutants such as dust and impurities in the air are prone to being mixed into the compressed air, the quality of the compressed air is affected, follow-up equipment using the compressed air can be possibly damaged, and the service life of the equipment is shortened. The novel air compressor comprises an air cylinder and a crankcase, the air cylinder is fixedly installed at the upper end of the crankcase and communicated with the crankcase, a piston assembly is arranged in the air cylinder, a crankshaft assembly is arranged in the crankcase, the piston assembly is connected with the crankshaft assembly through a connecting rod, and a cavity is formed in the position, located at the top of the piston assembly, of the air cylinder. An air inlet valve and an exhaust valve are arranged in the cavity, an air inlet pipe and an exhaust pipe are connected to the air inlet valve and the exhaust valve respectively, and an opening groove is formed in the air inlet pipe. The device has the advantages that the cleanliness of compressed air is improved, and the reliability and the stability of the device are improved.