CN217029231U - Air compressor - Google Patents

Abstract

The utility model relates to the technical field of automobile accessories, in particular to an air compressor. The air compressor comprises a cooling oil duct, the cooling oil duct is distributed in the air compressor, and lubricating oil can circulate in the cooling oil duct. Adopt the range in the inside cooling oil duct of air compressor, but circulation lubricating oil in the cooling oil duct, the inside heat of air compressor and then cool off air compressor is absorbed and taken away to the lubricating oil, cooling oil duct sets up inside air compressor in this scheme, when the air compressor machine assembles with the car complete machine, the scheduling problem that can produce the cooling oil duct to other parts has been avoided, the effectual structure that protects the cooling oil duct, the service life of cooling oil duct has been prolonged, the maintenance problem because of the oil duct damage leads to has been reduced, air compressor's later maintenance cost has been reduced.

Description

Air compressor

Technical Field

The utility model relates to the technical field of automobile accessories, in particular to an air compressor.

Background

The air compressor is a device for providing air source power by compressed air, which converts mechanical energy of a prime power mechanism into air pressure energy, and components in the air compressor do work to generate more mechanical friction heat, and if the heat dissipation is not timely, the heat can cause the internal temperature of the compressor to be overhigh, thereby reducing the service life of the compressor.

The air compressor generally adopts a method of cooling lubricating oil to cool the generated mechanical friction heat, the lubricating oil is continuously input and output, and a large amount of heat can be absorbed while the lubricating is carried out, so that the air compressor is cooled.

An electrically driven air compressor for a vehicle is disclosed in patent document [ CN201110231816.1], in which: "one end of oil cooler is equipped with input oil pipe, and the other end is equipped with cooling oil return pipe", "the upper end of lubricating oil pump pass through second oil pipe with oil pocket intercommunication in the cylinder head", however, among this technical scheme, the oil pipe majority that constitutes the cooling oil duct sets up in the cylinder body outside, and when the air compressor assembly, other parts easily touched the external oil pipe of air compressor machine in the car like this for oil pipe is easy by other parts bruising or bruise, and lubricating oil leaks, thereby leads to oil pipe life-span to shorten, has increased the maintenance cost of air compressor machine.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model provides the air compressor capable of effectively protecting the cooling oil duct.

The utility model is realized by the following technical scheme:

an air compressor comprises a cooling oil duct, wherein the cooling oil duct is distributed in the air compressor and lubricating oil can circulate in the cooling oil duct.

Further, the air compressor comprises a base, an oil pan, a cooler, a cylinder body and an oil filter; the base is provided with two parallel mounting surfaces, a space is reserved between the two mounting surfaces, and the two mounting surfaces are not coplanar; the oil pan is arranged on one mounting surface, and the cylinder body, the cooler and the engine oil filter are arranged on the other mounting surface; one end of the cylinder body, which is far away from the base, is also detachably connected with the pump head assembly; the cooling oil duct runs through the cylinder body, the pump head assembly, the cooler and the engine oil filter.

Furthermore, the cooling oil duct comprises an oil suction pipe, a first oil duct, a second oil duct, a third oil duct, an oil return pipe, a cooler and an engine oil filter; the inner cavity of the oil suction pipe is one part of a cooling oil passage, a first oil passage is arranged in one side wall of the cylinder body, a second oil passage is formed in the pump head assembly, a third oil passage is arranged in the other side wall of the cylinder body, the interiors of the cooler and the engine oil filter are one part of the cooling oil passage, and the inner cavity of an oil return pipe between the cooler and the engine oil filter is the rest part of the cooling oil passage; the inner cavity of the oil suction pipe, the first oil duct, the second oil duct, the third oil duct, the cooler, the oil return pipe and the engine oil filter are communicated in sequence; and a space is reserved between the pipe opening of the oil suction pipe and the outlet of the engine oil filter.

Further, the pump head assembly comprises a valve plate and a cylinder cover, the valve plate is arranged between the cylinder cover and the cylinder body, and the valve plate is detachably connected with the cylinder body and the cylinder cover respectively; the valve plate is provided with a first half groove, the cylinder cover is provided with a second half groove, the first half groove and the valve plate form a first outline, the second half groove and the cylinder cover form a second outline, the valve plate is buckled with the cylinder cover, the first outline and the second outline can be mutually overlapped, and the first half groove and the second half groove can form a second oil duct for circulating lubricating oil.

Furthermore, the cooling device also comprises a cooling fan, the cooler is in an arch shape, and the cooling fan is surrounded by the cooler; the axis of the cooling fan points to the cylinder.

Further, air compressor includes the oil pump, and the oil pump sets up between inhaling oil pipe and first oil duct, the oil inlet of oil pump with inhale the one end mouth of pipe intercommunication of oil pipe, an oil-out and the first oil duct intercommunication of oil pump.

Further, a cavity is formed in the cylinder body, an oil sump is provided with an oil cavity for containing lubricating oil, and the oil cavity is communicated with the cavity; one end of the oil suction pipe is arranged in the oil cavity, and the outlet of the engine oil filter is arranged corresponding to the oil cavity.

Furthermore, the cavity is also provided with a crankshaft, a lubricating oil channel is arranged in the crankshaft, and one end of the lubricating oil channel is communicated with the other oil outlet of the oil pump; the bent axle is equipped with a plurality of lubrication holes, and a plurality of lubrication holes all communicate with the lubrication oil duct, and the bent axle rotates and to get rid of the lubricating oil in the lubrication oil duct to the cavity in through a plurality of lubrication holes.

Further, the oil pump is a bidirectional lubricating oil pump.

Furthermore, the air compressor further comprises a driving motor, the driving motor is arranged on the installation base, and a main shaft of the driving motor is connected with the crankshaft.

Compared with the prior art, the utility model has the advantages that:

1. adopt the range in the inside cooling oil duct of air compressor, but circulation lubricating oil in the cooling oil duct, the inside heat of air compressor and then cool off air compressor is absorbed and taken away to the lubricating oil, cooling oil duct sets up inside air compressor in this scheme, when the air compressor machine assembles with the car complete machine, the scheduling problem that perhaps produces the cooling oil duct of other parts in the car was hindered, the effectual structure that protects the cooling oil duct, the service life of cooling oil duct has been prolonged, the maintenance problem because of the oil duct damage leads to has been reduced, air compressor's later maintenance cost has been reduced.

Drawings

Fig. 1 is a schematic view of an external structure of an air compressor according to an embodiment;

FIG. 2 is another schematic structural view of FIG. 1;

fig. 3 is a schematic cross-sectional view illustrating an internal structure of an air compressor according to an embodiment;

FIG. 4 is a schematic view of a pump head assembly according to an embodiment;

fig. 5 is a bottom view of the fig. 1 structure.

The engine oil cooling system comprises a pump head assembly 101, a cylinder block 103, a driving motor 1, a cooling assembly 104, a coupler 2, a crankshaft 3, a low-pressure piston assembly 4, a valve plate 5, a cylinder cover 6, a high-pressure piston assembly 7, an oil pump 8, an oil suction pipe 9, a cooler 10, an air outlet joint 11, an air inlet joint 12, an oil return pipe 14, an engine oil filter 16, an oil pan 17, a cooling fan 18, a shock pad 19, a mounting base 20, a main shaft 22, a cooling oil channel 23, a first oil channel 24, a second oil channel 25, a third oil channel 26, a base 27, a lubricating oil channel 28, a lubricating hole 29, a cavity 31, an oil cavity 32, a first half groove 33, a second half groove 34, a low-pressure piston cavity 311, a high-pressure piston cavity 312, a breathing through hole 501, a first-stage air suction cavity 502, a first-stage air exhaust cavity 503, a second-stage air suction cavity 504 and a second-stage air exhaust cavity 505.

Detailed Description

The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

As shown in fig. 1 and 3, an air compressor according to a preferred embodiment of the present invention includes a cooling oil passage, the cooling oil passage is disposed inside the air compressor, and lubricating oil can flow through the cooling oil passage.

In prior art, partial cooling oil duct pipeline sets up in the outside of air compressor structure, and when the air compressor assembly, other parts easily touched the external oil pipe of air compressor machine in the car like this for oil pipe is easy to be damaged or collided with by other parts, thereby easily leads to lubricating oil to leak, pollutes the installation environment, and oil pipe life-span shortens simultaneously, has increased the later maintenance cost of air compressor machine.

In this scheme, and adopted the cooling oil duct of arranging in air compressor inside, the cooling oil duct is by the effectual protection of air compressor's organism structure to when the air compressor machine with the whole assembly of car, avoided other parts probably to the scheduling problem of damaging that the cooling oil duct produced, the effectual cooling oil duct that has protected has prolonged the life of cooling oil duct, has reduced because of the damaged maintenance problem that leads to of oil duct, has reduced air compressor's later maintenance cost.

Further, referring to fig. 1 to 3, the air compressor includes a base 27, an oil pan 17, a cooler 10, a cylinder block 103, and an oil filter 16; the base 27 is provided with two parallel mounting surfaces, a distance is reserved between the two mounting surfaces, and the two mounting surfaces are not coplanar; the oil pan 17 is provided on one mounting surface, and the cylinder block 103, the cooler 10, and the oil filter 16 are provided on the other mounting surface; the end of the cylinder 103 remote from the base 27 is also removably connected to the pump head assembly 101; the cooling oil passage passes through the cylinder block 103, the pump head assembly 101, the cooler 10, and the oil filter 16.

In the scheme, the base 27 is provided with two mounting surfaces which are parallel to each other, the oil pan 17 is arranged on one mounting surface, the cylinder body 103, the cooler 10 and the engine oil filter 16 are arranged on the other mounting surface, and therefore the oil pan 17, the cylinder body 103, the cooler 10 and the engine oil filter 16 are all integrated on the base 27, the structure is compact, the space is utilized more effectively, the air compressor and the whole automobile are assembled, the occupied space of the whole air compressor is smaller, and the mounting space of the air compressor in the whole automobile can be saved more effectively.

Meanwhile, the cooling oil channel sequentially penetrates through the cylinder body 103, the pump head assembly 101, the cooler 10 and the engine oil filter 16, lubricating oil flows through the cooling oil channel, and in the flowing process of the lubricating oil in the cooling oil channel, partial heat in each structure through which the cooling oil channel passes can be absorbed and taken away, so that a good cooling effect is achieved.

Meanwhile, in the prior art, the cylinder 103 and the base 27 are usually detachably connected, specifically, the cylinder 103 is fixedly mounted on the base 27 by using screws or bolts, so that when the air compressor works, the cylinder 103 is easily vibrated due to the movement of the internal piston assembly acting, the screws between the cylinder 103 and the base 27 are loosened, and even the cylinder 103 may fall off from the base 27.

In this embodiment, preferably, the cylinder 103 and the base 27 are integrally cast, so that on one hand, the cylinder 103 and the base 27 are integrally formed, and the total mass of the cylinder 103 and the base 27 is greater than that of the cylinder 103, which can reduce the vibration of the cylinder 103, and on the other hand, the cylinder 103 can be effectively prevented from falling off from the base 27, and the safety is high.

Further, the cooling oil channels comprise an oil suction pipe 9, a first oil channel 24, a second oil channel 25, a third oil channel 26, an oil return pipe 14, a cooler 10 and an engine oil filter 16; the inner cavity of the oil suction pipe 9 is a part of a cooling oil passage, a first oil passage 24 is arranged in one side wall of the cylinder body 103, a second oil passage 25 is formed in the pump head assembly 101, a third oil passage 26 is arranged in the other side wall of the cylinder body 103, the interiors of the cooler 10 and the engine oil filter 16 are parts of the cooling oil passage, and the inner cavity of the oil return pipe 14 between the cooler 10 and the engine oil filter 16 is the rest part of the cooling oil passage; the inner cavity of the oil suction pipe 9, the first oil channel 24, the second oil channel 25, the third oil channel 26, the cooler 10, the oil return pipe 14 and the engine oil filter 16 are communicated in sequence; a space is left between the nozzle of the suction pipe 9 and the outlet of the oil filter 16.

Referring to fig. 2, 3 and 5, in this solution, the cooling oil passage is composed of an inner cavity of the oil suction pipe 9, a first oil passage 24, a second oil passage 25, a third oil passage 26, the cooler 10, the oil return pipe 14 and the engine oil filter 16, the lubricating oil can pass through the inner cavity of the oil suction pipe 9, the first oil passage 24, the second oil passage 25, the third oil passage 26, the cooler 10, the inner cavity of the oil return pipe 14 and the engine oil filter 16 in sequence, and the oil suction pipe 9, the first oil passage 24, the second oil passage 25, the third oil passage 26, the cooler 10, the oil return pipe 14 and the engine oil filter 16 form a structure surrounding the cavity 31 of the air compressor, specifically, a cavity 31 is provided in the cylinder 103, the cavity 31 and the cylinder 103 form two openings, one of which is blocked by the pump head assembly 101, the other of which is used for discharging the lubricating oil to the oil sump 17, a piston assembly is provided in the cavity 31, and works in the cavity 31 to generate friction heat, the heat of compression, friction heat and compression heat generated by the air compressed by the piston assembly can exchange heat with the lubricating oil in the cooling oil passage and the cylinder 103 through the pump head assembly 101, so that the air compressor is cooled.

Further, the pump head assembly 101 comprises a valve plate 5 and a cylinder cover 6, the valve plate 5 is arranged between the cylinder cover 6 and the cylinder body 103, and the valve plate 5 is detachably connected with the cylinder body 103 and the cylinder cover 6 respectively; the valve plate 5 is provided with a first half groove 33, the cylinder cover 6 is provided with a second half groove 34, the first half groove 33 and the valve plate 5 form a first outline, the second half groove 34 and the cylinder cover 6 form a second outline, the valve plate 5 and the cylinder cover 6 are buckled, the first outline and the second outline can be mutually overlapped, and the first half groove 33 and the second half groove 34 can form a second oil channel 25 for circulating lubricating oil.

In the prior art, an oil chamber is arranged in the cylinder cover, and lubricating oil can circulate in the oil chamber, and the defects of the scheme are as follows: on the one hand, a complete oil cavity is processed in the cylinder cover, the process is complex, the processing is inconvenient, the processing cost is high, on the other hand, the oil cavity arranged in the cylinder cover is generally linear and is difficult to process into a curve, and then the proportion of the area of the cylinder cover occupied by the oil cavity is small, so that when lubricating oil circulating in the oil cavity exchanges heat with the cavity 31 through the cylinder cover, the heat exchange area is small, and the cooling effect on the air compressor is not ideal.

Referring to fig. 4, in the present solution, a first half groove 33 is disposed on the valve plate 5, a second half groove 34 is disposed on the cylinder head 6, the valve plate 5 is fastened to the cylinder head 6, and the first half groove 33 and the second half groove 34 can form a second oil passage 25 for circulating lubricating oil, preferably, the first half groove 33 and the second half groove 34 are both curved, and the flow passages thereof substantially extend over and cover the cavity 31; on the one hand, valve plate 5 can be dismantled with cylinder cap 6, every half groove is the easy machine-shaping all, both can process into the curve form, also can process for the linearity, on the other hand, compare in prior art, the second oil duct 25 occupies the proportion of 6 areas of cylinder cap great, so when circulation lubricating oil in second oil duct 25, frictional heat accessible pump head assembly 101 in the cavity 31 forms the heat exchange with the lubricating oil in the second oil duct 25, and then be favorable to the heat dissipation of air compressor machine more, the cooling effect has been promoted.

Further, a cooling fan 18 is also included, the cooler 10 is in an arch shape, and the cooling fan 18 is surrounded by the cooler 10; the axial line of the cooling fan 18 is directed toward the cylinder 103.

Optionally, the cooler 10 is in an arch structure, the cooler 10 may be one of an oil cooler, a water cooler, or a gas cooler, and the oil cooler, the water cooler, or the gas cooler are all in the prior art, and are respectively described in the patent documents [ CN201320333717.9], [ cn200920163857.x ], and [ CN201620774369.2], which are not described herein in detail.

Specifically, the cooling fan 18 adopts an electronic fan assembly structure, which includes a cooling fan cover, a fan, an electric wire harness and other structures, and a patent document CN201920259602.7 discloses a cooling device of an oil-free electric scroll air compressor for a new energy electric vehicle, wherein the electronic fan assembly structure is introduced and explained in detail, which is not repeated herein.

The cooling fan 18 is used for cooling the cylinder 103 by cooling air, in the scheme, the cooler 10 is arched, and the cooling fan 18 is surrounded by the cooler 10; therefore, the installation positions of the cooling fan 18 and the cooler 10 are overlapped, the whole mechanism is more compact, the whole volume of the air compressor is effectively reduced, and the whole installation space of the air compressor is saved. Preferably, the cooler is a radiator fin type cooler, and the patent document [ CN106918253A ] discloses the internal structure and the working principle of the cooler, and it should be noted that the cooler 10 in the present solution is different from the cooler in the patent document [ CN106918253A ] only in that the shape of the outer part of the cooler in the present solution is an arch structure. Of course, the cooler 10 in this embodiment may also be other cooler structures in the prior art, and will not be described herein.

Further, the air compressor includes an oil pump 8, the oil pump 8 is disposed between the oil suction pipe 9 and the first oil passage 24, an oil inlet of the oil pump 8 is communicated with a pipe opening at one end of the oil suction pipe 9, and an oil outlet of the oil pump 8 is communicated with the first oil passage 24. Preferably, the oil pump 8 is a bidirectional lubricating oil pump.

The oil pump 8 is disposed between the oil suction pipe 9 and the first oil passage 24, and is used as a power source for sucking oil in the whole cooling oil passage. The scheme adopts a bidirectional lubricating oil pump, and is mentioned in a power oil circulation supply device of a thin oil lubricating system in patent document [ CN201810760146.4 ]: the bidirectional lubricating oil pump is widely applied to a lubricating and cooling system of the speed reducer, when the driving shaft rotates forwards or reversely, an oil inlet and an oil outlet of the bidirectional lubricating oil pump are unchanged, and normal lubrication, cooling and the like are realized on the speed reducer; i.e., a bi-directional lubrication pump, is known in the art and will not be described in greater detail herein. In the prior art, if the motor rotates reversely, the lubricating oil pump cannot pump oil, and components such as a crankshaft connecting rod and the like in the air compressor cannot obtain the lubricating effect of the lubricating oil, so that clamping stagnation ablation is easy to occur; in this scheme, and adopted two-way lubricating oil pump, when the motor reversal, two-way lubricating oil pump still can pump oil, can not influence the lubricated effect between the subassembly such as bent axle connecting rod in the air compressor machine, and this scheme is safe and reliable more.

Further, a cavity 31 is formed in the cylinder body 103, an oil sump 17 is provided with an oil cavity 32 for containing lubricating oil, and the oil cavity 32 is communicated with the cavity 31; one end of the oil suction pipe 9 is disposed in the oil chamber 32, and an outlet of the oil filter 16 is disposed corresponding to the oil chamber 32.

The oil pan 17 is filled with lubricating oil, the oil suction pipe 9 sucks oil from the oil cavity 32, the sucked lubricating oil surrounds the cavity 31 for a circle and then absorbs most of heat in the cavity 31, then the lubricating oil is cooled by the cooler 10 and passes through the engine oil filter 16 to filter most of impurities and particles, and finally flows out of the outlet of the engine oil filter 16, the outlet of the engine oil filter 16 is arranged corresponding to the oil cavity 32, the flowing lubricating oil returns to the oil cavity 32 again, and then the oil suction pipe 9 sucks oil from the oil cavity 32 again, so that the lubricating oil is continuously sucked from the oil pan 17 and then discharged into the oil pan 17 for recycling, and cost is effectively saved.

Further, the cavity 31 is further provided with a crankshaft 3, a lubricating oil channel 28 is arranged in the crankshaft 3, and one end of the lubricating oil channel 28 is communicated with the other oil outlet of the oil pump 8; crankshaft 3 is equipped with a plurality of lubrication hole 29, and a plurality of lubrication hole 29 all communicate with lubrication oil duct 28, and crankshaft 3 rotates and to get rid of the lubricating oil in lubrication oil duct 28 in cavity 31 through a plurality of lubrication hole 29.

Specifically, in the scheme, after the oil pump 8 sucks lubricating oil, one part of the lubricating oil enters the cooling oil duct, the other part of the lubricating oil enters the lubricating oil duct 28 in the crankshaft 3, the crankshaft 3 rotates, and the lubricating oil in the lubricating oil duct 28 can be thrown into the cavity 31 through the plurality of lubricating holes 29; on the one hand, the lubricating oil of getting rid of in the cavity 31 can be to each part in the cavity 31, for example piston assembly, play lubricated effect, on the other hand, lubricating oil still can absorb the heat in the partial cavity 31, and, receive the action of gravity, unnecessary lubricating oil can be along each part nature drippage in cavity 31 inner wall or the cavity 31, cavity 31 sets up directly over oil pocket 32, the oral area of oil pocket 32 corresponds and communicates with the oral area position of cavity 31, the lubricating oil that the cavity 31 inner wall received the action of gravity can drip naturally and retrieve to oil pan 17, like this lubricating oil also can reuse, be favorable to practicing thrift the cost.

Further, the air compressor further comprises a driving motor 1, the driving motor 1 is arranged on the mounting base 20, and a main shaft of the driving motor 1 is connected with the crankshaft 3.

In the prior art, one end of the driving motor 1 is usually connected with the cylinder body, and the other end of the driving motor 1 is suspended, so that the driving motor 1 is in a cantilever beam state, one end of the driving motor is subjected to a large stress for a long time, and the joint is easy to break.

In this scheme, driving motor 1 sets up on installation base 20, and on the one hand, this makes the holistic focus of air compressor machine descend, is favorable to noise abatement and vibration, and on the other hand, driving motor 1 has avoided the state of the cantilever beam among the prior art like this, and effectual protection driving motor 1 has reduced its influence of being connected stress concentration with bent axle 3 for driving motor 1's life extension, driving motor 1's mounting means is more reliable in this scheme.

Furthermore, the preferred bipolar compression piston compressor of air compressor machine of this scheme, cavity 31 includes low pressure piston chamber 311 and high pressure piston chamber 312, sets up low pressure piston assembly 4 in the low pressure piston chamber 311, sets up high pressure piston assembly 7 in the high pressure piston chamber 312, and low pressure piston assembly 4 and high pressure piston assembly 7 are connected with bent axle 3 respectively, and simultaneously, be provided with on the cylinder cap 6 and give vent to anger and connect 11 and inlet connection 12, inlet connection 12 and low pressure piston chamber intercommunication, give vent to anger and connect 11 and high pressure piston chamber intercommunication. The driving motor 1 drives the crankshaft 3 to rotate, the crankshaft 3 drives the low-pressure piston assembly 4 and the high-pressure piston assembly 7 which are connected with the crankshaft 3 to move up and down, and in each instant, the moving directions of the low-pressure piston assembly 4 and the high-pressure piston assembly 7 are opposite, namely when the low-pressure piston assembly 4 moves down, the high-pressure piston assembly 7 moves up, and vice versa.

Further, the valve plate 5 and the cylinder cover 6 can be buckled to form a first-stage air suction cavity 502, a first-stage exhaust cavity 503, a second-stage air suction cavity 504 and a second-stage exhaust cavity 505.

Further, a primary air suction cavity 502 is communicated with the air inlet joint 12, a primary air exhaust cavity 503 is communicated with a secondary air suction cavity 504, and a secondary air exhaust cavity 505 is communicated with the air outlet joint 11; the valve plate 5 and the cylinder cover 6 are also provided with a plurality of convex ribs, and the space between the first-stage air suction cavity 502 and the first-stage exhaust cavity 503, the space between the second-stage air suction cavity 504 and the second-stage exhaust cavity 505, and the space between the first-stage air suction cavity 502 and the second-stage exhaust cavity 505 are all blocked by the convex ribs and are not communicated with each other.

The primary suction cavity 502 and the primary exhaust cavity 503 can also be communicated with the low-pressure piston cavity 311 of the low-pressure piston assembly 4, and the one-way valve is arranged between the primary suction cavity 502 and the low-pressure piston cavity 311, so that the gas in the primary suction cavity 502 can only flow from the primary suction cavity 502 to the low-pressure piston cavity 311; a check valve is also provided between the primary vent chamber 503 and the low pressure piston chamber 311 so that gas can only flow from the low pressure piston chamber 311 to the primary vent chamber 503.

The secondary air suction cavity 504 and the secondary exhaust cavity 505 can be further communicated with the high-pressure piston assembly 7, and specifically, a one-way valve is arranged between the secondary air suction cavity 504 and the high-pressure piston cavity 312, so that air can only flow from the secondary air suction cavity 504 to the high-pressure piston cavity 312; a check valve is provided between the secondary vent chamber 505 and the high pressure piston chamber 312 so that gas can only flow from the high pressure piston chamber 312 to the secondary vent chamber 505.

When the air compressor works, the low-pressure piston assembly 4 moves downwards, the pressure in the low-pressure piston cavity 311 is reduced, the check valve arranged between the primary air suction cavity 502 and the low-pressure piston cavity 311 is opened, the air inlet joint 12 sucks external air, the external air enters the low-pressure piston cavity 311 through the primary air suction cavity 502, then the low-pressure piston assembly 4 does work and moves upwards, the pressure in the low-pressure piston cavity 311 is increased at the moment, the check valve arranged between the primary air suction cavity 502 and the low-pressure piston cavity 311 is closed, the check valve arranged between the primary exhaust cavity 503 and the low-pressure piston cavity 311 is opened, and air flows from the low-pressure piston cavity 311 to the primary exhaust cavity 503 and enters the primary exhaust cavity 503; then the high pressure piston assembly 7 moves downwards, the one-way valve between the high pressure piston cavity 312 and the secondary suction cavity 504 is opened, and the gas flows through the secondary suction cavity 504 from the primary exhaust cavity 503 and enters the high pressure piston cavity 312; then, the high pressure piston assembly 7 moves upward to compress the air, at this time, the check valve between the high pressure piston chamber 312 and the secondary suction chamber 504 is closed, the check valve between the high pressure piston chamber 312 and the secondary discharge chamber 505 is opened, and the air in the high pressure piston chamber 312 enters the secondary discharge chamber 505 and is discharged along the air intake joint 12.

Further, in the prior art, an exhaust gas discharge pipeline needs to be arranged on the valve plate to discharge the exhaust gas which is not discharged completely in the low-pressure piston assembly 4. In the scheme, the bottom of the valve plate 5 is also provided with a breathing through hole 501, and the breathing through hole 501 communicates the primary air suction cavity 502 with the low-pressure piston cavity 311; the breathing hole 501 allows the waste gas that is not completely discharged in the low pressure piston assembly 4 to flow into the first-stage suction chamber 502 again, and then to enter the low pressure piston chamber 311 when the low pressure piston assembly 4 sucks in the next time. The scheme saves a waste gas discharge pipeline arranged in the prior art, not only saves the integral installation space of the air compressor, but also is more convenient to process compared with the prior art.

Further, as disclosed in patent document CN201721238465.6, in the prior art, a plurality of heat dissipation fins are usually required to be disposed in the cylinder head for dissipating heat generated by the piston assembly applying work and transferring the heat to the cylinder head; and in this application, got rid of a plurality of fin structures on the cylinder cap among the prior art, set up cooling oil duct's partly on the cylinder cap, dispel the heat to the cylinder cap through cooling oil duct, avoided a plurality of fin structures to process on the cylinder cap, the cylinder cap appearance of this scheme is processed more easily.

Further, still set up the partly in chamber of breathing in, the partly in chamber of exhausting on the cylinder cap of this scheme, compare in prior art, this scheme has increased the volume in chamber of breathing in, the chamber of exhausting, can make piston assembly admit air like this, the exhaust is more abundant.

The above examples only show several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An air compressor is characterized by comprising a cooling oil duct, wherein the cooling oil duct is distributed in the air compressor, and lubricating oil can circulate in the cooling oil duct.

2. The air compressor according to claim 1, wherein the air compressor comprises a base (27), an oil pan (17), a cooler (10), a cylinder (103), and an oil filter (16); the base (27) is provided with two parallel mounting surfaces, a distance is reserved between the two mounting surfaces, and the two mounting surfaces are not coplanar; an oil pan (17) is arranged on one mounting surface, and a cylinder body (103), a cooler (10) and an oil filter (16) are arranged on the other mounting surface; one end of the cylinder body (103) far away from the base (27) is also detachably connected with the pump head assembly (101); the cooling oil channel penetrates through the cylinder body (103), the pump head assembly (101), the cooler (10) and the engine oil filter (16).

3. The air compressor according to claim 2, wherein the cooling oil passages include an oil suction pipe (9), a first oil passage (24), a second oil passage (25), a third oil passage (26), an oil return pipe (14), the cooler (10), and an oil filter (16); the inner cavity of the oil suction pipe (9) is a part of a cooling oil passage, a first oil passage (24) is arranged in one side wall of the cylinder body (103), a second oil passage (25) is formed in the pump head assembly (101), a third oil passage (26) is arranged in the other side wall of the cylinder body (103), the interiors of the cooler (10) and the engine oil filter (16) are parts of the cooling oil passage, and the inner cavity of the oil return pipe (14) between the cooler (10) and the engine oil filter (16) is the rest of the cooling oil passage; the inner cavity of the oil suction pipe (9), the first oil duct (24), the second oil duct (25), the third oil duct (26), the cooler (10), the oil return pipe (14) and the engine oil filter (16) are communicated in sequence; a space is left between the nozzle of the oil suction pipe (9) and the outlet of the engine oil filter (16).

4. An air compressor according to claim 3, wherein the pump head assembly (101) comprises a valve plate (5) and a cylinder head (6), the valve plate (5) is disposed between the cylinder head (6) and the cylinder block (103), and the valve plate (5) is detachably connected to the cylinder block (103) and the cylinder head (6), respectively; set up first half groove (33) on valve plate (5), cylinder cap (6) sets up second half groove (34), first half groove (33) and valve plate (5) form first profile, second half groove (34) and cylinder cap (6) form the second profile, valve plate (5) and cylinder cap (6) lock, the coincidence of first profile and second profile can each other, first half groove (33) and second half groove (34) can constitute second oil duct (25) that are used for circulating lubricating oil.

5. The air compressor according to claim 4, further comprising a cooling fan (18), the cooler (10) having an arch shape, the cooling fan (18) being surrounded by the cooler (10); the axis of the cooling fan (18) is directed toward the cylinder (103).

6. The air compressor according to claim 5, wherein the air compressor comprises an oil pump (8), the oil pump (8) is disposed between the oil suction pipe (9) and the first oil passage (24), an oil inlet of the oil pump (8) is communicated with an end nozzle of the oil suction pipe (9), and an oil outlet of the oil pump (8) is communicated with the first oil passage (24).

7. The air compressor according to claim 6, wherein a cavity (31) is formed in the cylinder block (103), the oil pan (17) is provided with an oil chamber (32) for containing lubricating oil, and the oil chamber (32) is communicated with the cavity (31); one end of the oil suction pipe (9) is arranged in the oil cavity (32), and the outlet position of the engine oil filter (16) is arranged corresponding to the oil cavity (32).

8. The air compressor as claimed in claim 7, wherein the cavity (31) is further provided with a crankshaft (3), a lubricating oil channel (28) is arranged in the crankshaft (3), and one end of the lubricating oil channel (28) is communicated with the other oil outlet of the oil pump (8); bent axle (3) are equipped with a plurality of lubrication hole (29), and a plurality of lubrication hole (29) all communicate with lubrication oil duct (28), and bent axle (3) rotate can with the lubrication oil in lubrication oil duct (28) through a plurality of lubrication hole (29) get rid of to in cavity (31).

9. Air compressor according to any of claims 6-8, characterized in that the oil pump (8) is a two-way lubricating oil pump.

10. The air compressor according to claim 9, further comprising a driving motor (1) and a mounting base (20), wherein the mounting base (20) is fixed to a mounting surface of the base (27), the mounting surface is the same as a mounting surface on which the oil pan (17) is provided, the driving motor (1) is provided on the mounting base (20), and a main shaft of the driving motor (1) is connected to the crankshaft (3).

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