CN210218016U - Two-stage oil-free air compressor - Google Patents

Abstract

The utility model relates to an air compressor machine technical field wherein discloses a second grade oil-free air compressor machine, it includes the crankcase and sets up the cylinder on the crankcase, it is provided with the bent axle to rotate in the crankcase, be connected with on the bent axle with cylinder complex piston unit, the cylinder includes two at least elementary cylinders and a secondary cylinder, be provided with one-level intake duct and the one-level exhaust passage with the atmosphere intercommunication on the elementary cylinder, be provided with second grade intake duct and output compressed air's second grade exhaust passage on the secondary cylinder, the one-level intake duct with the intercommunication is provided with the interstage trachea between the second grade intake duct, the air can only one-way circulation in the interstage trachea. The utility model discloses have under the condition that does not increase the air compressor machine volume, realize improving the output pressure and the compressed gas output volume of air compressor machine through the second grade compression, reduce the effect of partial energy consumption.

Description

Two-stage oil-free air compressor

Technical Field

The utility model belongs to the technical field of the air compressor machine technique and specifically relates to a second grade does not have oil air compressor machine.

Background

The oil-free air compressor belongs to a miniature reciprocating piston type compressor, mechanical energy is converted into gas pressure energy, compressed gas with certain pressure is provided to drive pneumatic equipment, and a large vehicle-mounted air compressor is mostly a multi-cylinder air compressor with three cylinders and more than three cylinders.

The existing chinese patent publication No. CN105927507A discloses an oil-free compressor and an auxiliary compressor unit, in which, when the compressor is driven by a driving motor to rotate by a crankshaft, a connecting rod drives a self-lubricating piston to reciprocate by the transmission of the connecting rod, and the volume of a working chamber enclosed by the inner wall of a cylinder, the cylinder cover and the top surface of the piston changes periodically, so that the cylinder inhales and exhausts in one direction.

The above prior art solutions have the following drawbacks: generally, the output pressure of an air compressor used for starting a big bus opening and closing door cannot meet the pressure required by an air suspension of the air compressor when the big bus is fully loaded, the pressure of the output of the air compressor needs to be increased, according to the law of thermodynamics P1V1/T1= P2V2/T2, the process of compressing air is simplified into isothermal compression, namely T1= T2, one compressed air is simplified into a cylinder shape, V1= Sh1, V2= Sh2, h1= h2+ h0, wherein P1, V1, T1 and h1 are state parameters before air compression, P2, V2, T2 and h2 are state parameters after air compression, h0 is a piston stroke, therefore, the equation can be deduced to be epsilon = P2/P1=1+ h0/h2, the compression ratio can be increased by increasing h0 and reducing h2, the output pressure of the piston stroke = 24, but the compression ratio h0 is increased, the diameter of a crankshaft is more than 0, the eccentric journal of the air compressor needs to be increased, and the eccentric distance of the compressor is 0, the volume of the crankcase must be increased to accommodate the crankshaft with the increased eccentricity, and the vehicle-mounted air compressor is limited by the narrow working space, so that the output pressure of the air compressor cannot be increased by the method.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a second grade does not have oil air compressor machine utilizes the second grade compression to improve the output pressure of air compressor machine.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides a second grade oilless air compressor, includes the crankcase and sets up the cylinder on the crankcase, it is provided with the bent axle to rotate in the crankcase, be connected with on the bent axle with cylinder complex piston unit, the cylinder includes two at least elementary cylinders and a secondary cylinder, be provided with one-level intake duct and the one-level exhaust passage with the atmosphere intercommunication on the elementary cylinder, be provided with the second grade exhaust passage of second grade intake duct and output compressed air on the secondary cylinder, the one-level intake duct with the intercommunication is provided with the stage trachea between the second grade intake duct, the trachea air can only one-way circulation in the stage trachea.

Through adopting above-mentioned technical scheme, the air compressor machine during operation, the bent axle drives piston assembly and is periodic motion, and the air pressure produces periodic variation in the cylinder, and the air flow path is simultaneously: air in the atmosphere enters the primary cylinder through the primary air inlet channel, the air is compressed in the primary cylinder for the first time and then enters the interstage air pipe through the primary air outlet channel, and because the air in the interstage air pipe can only flow in a single direction, the compressed air for the first time enters the secondary air inlet channel of the secondary cylinder along the interstage air pipe, then enters the secondary cylinder and is compressed for the second time, and then compressed air with higher air pressure is output through the secondary air outlet channel.

The utility model discloses further set up to: be provided with the air compressor machine air inlet on the crankcase, the piston unit includes primary piston assembly, primary piston assembly includes one-level piston and one-level baffle that admits air, the top surface of one-level piston is provided with the one-level air inlet, one-level baffle fastening connection that admits air is in the top surface of one-level piston, the one-level baffle that admits air covers on the one-level air inlet for having elastic sheet metal.

By adopting the technical scheme, when the primary piston moves downwards, negative pressure is formed in the primary cylinder, and air in the crankcase pushes the primary air inlet baffle to enter the primary cylinder; when the air pressure in the primary cylinder is balanced with the air pressure in the crankcase, the elastic primary air inlet baffle plate is restored to the original state and attached to the top surface of the primary piston to isolate the air in the primary cylinder and the air in the crankcase; when the primary piston moves upwards, the air pressure in the primary cylinder is greater than the air pressure in the crankcase, and the primary air inlet baffle is tightly pressed on the top surface of the primary piston under the action of pressure difference, so that the sealing performance of the primary air inlet is further improved, and the unidirectional air inlet of the primary cylinder is realized.

The utility model discloses further set up to: the primary air inlet baffle comprises an air inlet baffle inner ring and an air inlet baffle outer ring covering the primary air inlet, the air inlet baffle inner ring is connected with the air inlet baffle outer ring through an elastic air inlet baffle rod, and the air inlet baffle inner ring is connected to the primary piston through a bolt thread.

By adopting the technical scheme, the air inlet baffle rod is adopted to connect the outer ring of the first-stage air inlet baffle and the inner ring of the first-stage air inlet baffle, so that the air pressure threshold value of pushing the air in the crankcase away the first-stage air inlet baffle is reduced, the air inlet efficiency and the volume efficiency are improved, and finally the compression efficiency of air pressure is improved.

The utility model discloses further set up to: the primary cylinder comprises a primary cylinder cover assembly and a primary cylinder body, the primary cylinder cover assembly comprises a primary end cover, a primary partition plate and a primary exhaust baffle, the upper end of the primary partition plate is abutted to the lower end of the primary end cover, the lower end of the primary partition plate is abutted to the upper end of the primary cylinder body, the primary partition plate is provided with a primary exhaust port, the primary exhaust baffle is tightly connected to the upper end of the partition plate, the primary exhaust baffle is an elastic thin plate and covers the primary exhaust port, and a primary exhaust passage is formed in the primary end cover.

By adopting the technical scheme, when the primary piston moves upwards, air in the primary cylinder is compressed, the air pressure in the primary cylinder is increased, and when the air pressure in the primary cylinder is greater than the air pressure in the primary exhaust passage, the compressed air pushes the primary exhaust baffle to enter the primary exhaust passage; when the air pressure in the primary cylinder is balanced with the air pressure in the primary exhaust passage, the primary exhaust baffle is restored to be attached to the upper end of the primary partition plate, and air in the primary cylinder and the air in the exhaust passage are isolated; when the primary piston moves downwards, the air pressure in the primary cylinder is reduced, the air pressure of the primary exhaust passage is greater than that in the primary cylinder, and the primary exhaust baffle is tightly pressed at the upper end of the primary partition plate under the action of pressure difference, so that the tightness of the primary exhaust port is further improved, and unidirectional exhaust of the primary cylinder is realized.

The utility model discloses further set up to: the first-stage exhaust baffle comprises an exhaust baffle inner ring and an exhaust baffle outer ring covering the exhaust baffle outer ring on the first-stage exhaust port, the exhaust baffle inner ring is connected with the exhaust baffle outer ring through an elastic exhaust baffle rod, and the exhaust baffle inner ring is connected to the first-stage partition plate through a bolt and a thread.

By adopting the technical scheme, the exhaust baffle rod is adopted to connect the outer ring of the primary exhaust baffle and the inner ring of the primary exhaust baffle, so that the air pressure threshold value of the primary cylinder air pushing open the primary exhaust baffle is reduced, and the exhaust efficiency is improved.

The utility model discloses further set up to: the one-level end cover is provided with the exhaust vaulting pole that is used for the butt one-level exhaust baffle towards circumference interval on baffle one side, there is the exhaust clearance at exhaust vaulting pole top and one-level gas vent.

By adopting the technical scheme, the compressed air in the primary cylinder is extruded by the primary piston assembly and rapidly flows out from the primary exhaust port, the compressed air generates larger thrust on the primary exhaust baffle, and the exhaust baffle rod of the primary exhaust baffle is thinner, so that the compressed air is possibly deformed too much and loses the original function; when air is sucked, the negative pressure in the primary cylinder is utilized to suck the air in the crankcase, and when the air is sucked, the thrust generated by the air is not too large, so that a similar structure does not exist at the position of the first-stage air inlet baffle.

The utility model discloses further set up to: and a pressure regulating valve is arranged on the interstage air pipe.

Through adopting above-mentioned technical scheme, set up pressure regulating valve's pressure taking point behind the valve, guarantee that the atmospheric pressure behind the valve is invariable, the pressure of admitting air of secondary cylinder is invariable promptly, guarantees that the air inlet of secondary cylinder is stable.

The utility model discloses further set up to: the secondary cylinder comprises a secondary cylinder head assembly and a secondary cylinder block, the secondary cylinder head assembly comprises a secondary end cover, a secondary partition plate, a secondary air inlet baffle plate with one end fixedly connected to the lower end of the secondary partition plate, and a secondary exhaust baffle plate with one end fixedly connected to the upper end of the secondary partition plate, the upper end of the secondary clapboard is abutted against the lower end of the secondary end cover, the lower end of the secondary clapboard is abutted against the upper end of the secondary cylinder body, the secondary baffle plate is provided with a secondary air inlet and a secondary air outlet, the secondary end cover is provided with a secondary air inlet channel communicated with the secondary air inlet, the secondary exhaust channel communicated with the secondary exhaust port is arranged on the secondary end cover, the fixed end of the secondary air inlet baffle plate is far away from the secondary air inlet, the fixed end of the secondary air inlet baffle plate is covered on the secondary exhaust port, and the secondary air inlet baffle plate and the secondary exhaust baffle plate are both elastic thin plates.

By adopting the technical scheme, the secondary cylinder works, when the secondary piston assembly moves downwards, the volume in the secondary cylinder is increased to generate negative pressure, and primary compressed air in the secondary air inlet channel pushes the secondary air inlet baffle to enter the secondary cylinder to finish air inlet work; when the air pressure in the secondary cylinder is balanced with the air pressure in the secondary air inlet channel, the secondary air inlet baffle recovers to the original shape and is attached to the secondary air inlet channel, and the primary compressed air in the secondary air inlet channel and the secondary cylinder is isolated; when the secondary piston assembly moves upwards, the primary compressed air is compressed again, the air pressure in the secondary cylinder is increased, the air pressure difference between the secondary cylinder and the secondary air inlet channel further compresses the secondary air inlet baffle, meanwhile, the air pressure difference between the secondary cylinder and the secondary air outlet channel enables the secondary compressed air to push the secondary air outlet baffle away, and the secondary compressed air enters the secondary air outlet channel and outputs the compressed air.

The utility model discloses further set up to: the second-stage partition plate is embedded and attached to the lower end of the second-stage end cover, a sealing element is arranged on the periphery of the joint of the second-stage air inlet channel and the second-stage air inlet, a sealing element is arranged on the periphery of the joint of the second-stage air exhaust channel and the second-stage air exhaust port, an avoiding groove for avoiding the movement of the second-stage exhaust baffle is formed in the lower end of the second-stage end cover, and the avoiding groove is communicated with the second-stage.

Through adopting above-mentioned technical scheme, the second grade baffle inlays to establish and fits in second grade end cover lower extreme, and at second grade intake duct and second grade air inlet junction, sealed processing is all done with second grade gas vent junction to second grade exhaust passage, prevents that once compressed air from directly following second grade exhaust passage output after the second grade intake duct flows in, and the setting of dodging the groove simultaneously guarantees the normal work of second grade exhaust damper, guarantees the steady operation of air compressor machine.

To sum up, the utility model discloses a beneficial technological effect does:

air in the atmosphere is firstly sucked into the primary cylinder to complete primary compression and then is sucked into the secondary cylinder through the interstage air pipe to complete secondary compression and then is output, and the output pressure is improved under the condition that the volume of the air compressor is not increased;

the primary compressed gas is cooled in the interstage gas pipe and enters the secondary cylinder for secondary compression after the gas pressure is constant, the whole secondary air compression process approaches isothermal compression, and partial energy consumption is reduced;

the primary cylinder and the secondary cylinder work simultaneously, and the output quantity of the compressed gas of the air compressor is improved.

Drawings

Fig. 1 is a schematic view of the assembly structure of the present invention.

Fig. 2 is an exploded view of the structure of the primary cylinder.

Fig. 3 is a schematic structural view of the primary intake baffle.

FIG. 4 is a schematic view of the structure of a primary separator.

FIG. 5 is a schematic of a configuration of a primary exhaust baffle.

Fig. 6 is a schematic view of the structure of the lower end of the primary end cap.

Fig. 7 is an exploded view of the structure of the sub-cylinder.

Fig. 8 is a schematic structural view of the secondary separator.

Fig. 9 is a schematic view of the lower end structure of the secondary end cover.

In the figure, 1, crankcase; 11. an air inlet of an air compressor; 12. an air cleaner; 2. a primary cylinder; 21. a primary cylinder block; 22. a cylinder gasket; 23. a primary cylinder head assembly; 24. a primary end cover; 241. a primary exhaust passage; 242. an exhaust stay bar; 25. a primary separator plate; 251. a primary exhaust port; 252. a primary plate seal ring; 253. a circular groove; 254. the first ring groove 26 and the first-stage exhaust baffle; 261. an exhaust baffle inner ring; 262. an exhaust baffle outer ring; 263. an exhaust baffle rod; 3. a secondary cylinder; 31. a secondary cylinder block; 32. a secondary cylinder head assembly; 33. a secondary end cap; 331. a secondary air inlet channel; 332. a secondary exhaust passage; 333. an avoidance groove; 34. a secondary separator plate; 341. a secondary air inlet; 342. a secondary exhaust port; 343. a secondary plate seal ring; 344. a second ring groove; 35. a secondary intake baffle; 36. a secondary exhaust baffle; 4. a primary piston assembly; 41. a primary piston; 411. a primary air inlet; 42. a primary air intake baffle; 421. an air inlet baffle inner ring; 422. an outer ring of the intake baffle; 423. an intake air baffle rod; 5. a secondary piston assembly; 51. a secondary piston; 6. an interstage gas pipe; 61. a pressure regulating valve; 62. a pipe joint.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the utility model discloses a secondary oilless air compressor, including crankcase 1 and primary cylinder 2 and secondary cylinder 3 arranged on both ends of crankcase 1, the crankcase 1 is provided with a crankshaft in a rotating way, the crankshaft is connected with a piston unit matched with primary cylinder 2 and secondary cylinder 3, primary cylinder 2 and secondary cylinder 3 are fixed on crankcase 1 through fastening bolts, interstage trachea 6 is connected between primary cylinder 2 and secondary cylinder 3, crankcase 1 is provided with an air compressor inlet 11 at one end of primary cylinder 2, air filter 12 for filtering air is connected on air compressor inlet 11, filtered air is compressed by primary cylinder 2 and then enters interstage trachea 6, interstage trachea 6 is connected with secondary cylinder 3, air compressed by primary bottom is compressed again and outputs compressed air of higher atmospheric pressure after flowing into secondary cylinder 3 along interstage trachea 6 in one way, air in the atmosphere is firstly sucked into the primary cylinder 2, is sucked into the secondary cylinder 3 through the interstage air pipe 6 after being compressed for the first time, is output after being compressed for the second time, and the output pressure is improved under the condition that the volume of the air compressor is not increased.

Referring to fig. 2, the primary cylinder 2 includes a cylinder gasket 22, a primary cylinder block 21 and a primary cylinder head assembly 23, the cylinder gasket 22 is disposed at a connection portion of the primary cylinder block 21 and the crankcase 1 to ensure the sealing performance of the crankcase 1, the piston assembly includes a primary piston assembly 4 and a secondary piston assembly 5, the primary piston assembly 4 is slidably fitted in the primary cylinder block 21, the primary piston assembly 4 includes a primary piston 41 and a primary intake baffle 42, a primary air inlet 411 is circumferentially disposed at a top surface of the primary piston 41 at an interval, the primary air inlet 411 communicates with an inner cavity of the crankcase 1 and a working cavity of the primary cylinder 2, the top surface of the primary piston 41 is coaxially provided with the primary intake baffle 42, the primary intake baffle 42 (refer to fig. 3) includes an intake baffle inner ring 421 and an intake baffle outer ring 422 covering the primary air inlet 411, the intake baffle inner ring 421 and the intake baffle outer, the circle center of the inner ring 421 of the air inlet baffle is fixedly connected with the top surface of the primary piston 41 through bolts.

When the air compressor works, external air enters from the air filter 12, dust in the air enters into the crankcase 1 from the air compressor air inlet 11 on the crankcase 1 after being filtered, when the primary piston 41 moves downwards, the working cavity volume of the primary cylinder 2 is increased, negative pressure is formed in the working cavity, so that air in the cavity of the crankcase 1 pushes the air inlet baffle outer ring 422 away, the air enters into the working cavity of the primary cylinder 2, when the air pressure in the working cavity is balanced with the air pressure in the crankcase 1, the air inlet baffle outer ring 422 is restored to the original state under the elastic force action of the air inlet baffle rod 423 and is attached to the primary air inlet 411, the working cavity of the primary cylinder 2 is isolated from the inner cavity of the crankcase 1, and air inlet work; when the primary piston 41 moves upward to start compressing air, the air pressure in the working cavity starts to increase, negative pressure is changed into positive pressure, and the outer ring 422 of the air inlet baffle is pressed against the primary air inlet 411 to further seal the working cavity of the primary cylinder 2 due to the positive pressure in the working cavity.

Referring to fig. 2, the primary cylinder head assembly 23 includes a primary end cover 24 and a primary partition plate 25, a primary exhaust passage 241 is provided on the primary end cover 24, the upper end of the primary partition plate 25 abuts against the lower end of the primary end cover 24, the lower end plate of the primary partition plate 25 abuts against the upper end of the primary cylinder 2, the contact surface of the two abutting parts is annular, the upper end and the lower end of the primary partition plate 25 at the abutting parts, the lower end of the primary end cover 24 and the upper end of the primary cylinder block 21 are respectively provided with a first annular groove 254, a first plate sealing ring 252 is embedded in the first annular groove 254, so as to ensure the sealing performance of the primary cylinder 2, a circular groove 253 (refer to fig. 4) is provided at the center of the circle of the lower end of the primary partition plate 25.

The first-stage partition 25 is circumferentially provided with first-stage exhaust ports 251 at intervals, the first-stage exhaust ports 251 are communicated with the first-stage exhaust passage 241, the upper end of the first-stage partition 25 is fixedly connected with a first-stage exhaust baffle 26 through bolt threads, the first-stage exhaust baffle 26 (refer to fig. 5) comprises an exhaust baffle inner ring 261 and an exhaust baffle outer ring 262 covering the first-stage exhaust ports 251, the exhaust baffle inner ring 261 is connected with the exhaust baffle outer ring 262 through an elastic exhaust baffle rod 263, the exhaust stay rods 242 (refer to fig. 6) are circumferentially arranged on one side of the primary end cover 24 facing the primary baffle 25 at intervals, the exhaust stay rods 242 abut against the exhaust baffle outer ring 262 when the primary cylinder 2 exhausts air and keep a certain exhaust gap between the exhaust baffle outer ring and the primary exhaust port 251, so as to ensure the stability of the exhaust, meanwhile, the exhaust pressure of the primary cylinder 2 is obviously greater than the intake pressure, so that the primary exhaust baffle 26 is prevented from excessively deforming under the action of the larger exhaust pressure of the primary cylinder 2.

When the primary piston 41 moves downwards to start air intake, the air pressure in the working cavity starts to decrease at the moment, the air pressure in the primary exhaust passage 241 is larger than the air pressure in the working cavity, and the air pressure difference presses the exhaust baffle outer ring 262 on the primary exhaust port 251 to ensure that the primary compressed air cannot flow back into the working cavity of the primary cylinder 2.

Referring to fig. 3, the secondary cylinder 3 includes a secondary cylinder block 31 and a secondary cylinder head assembly 32, the secondary piston assembly 5 is slidably fitted in the secondary cylinder block 31, the secondary piston assembly 5 includes a secondary piston 51, the secondary cylinder head assembly 32 includes a secondary end cover 33, a secondary partition 34, a secondary intake baffle 35 having one end fastened to the lower end of the secondary partition 34, and a secondary exhaust baffle 36 having one end fastened to the upper end of the secondary partition 34, the secondary intake baffle 35 and the secondary exhaust baffle 36 are both strip-shaped thin plates having elasticity, the secondary partition 34 is fitted to the lower end of the secondary end cover 33, the secondary partition 34 is provided with a secondary intake port 341 and a secondary exhaust port 342, the secondary end cover 33 is provided with a secondary intake port 331 communicating with the secondary intake port 341, the secondary end cover 33 is provided with a secondary exhaust port 332 communicating with the secondary exhaust, second ring grooves 344 (refer to fig. 8) are formed in the peripheries of the second-stage air inlet 341 and the second-stage air outlet 342, second plate sealing rings 343 are embedded in the second ring grooves 344, the upper ends of the second plate sealing rings 343 abut against the lower end of the second-stage end cover 33 to ensure the sealing performance of the joints of the second-stage air inlet 341 and the second-stage air inlet 331 and the joints of the second-stage air outlet 342 and the second-stage air exhaust passage 332, the other end of the second-stage air inlet baffle 35 covers the second-stage air inlet 341, the other end of the second-stage air exhaust baffle 36 covers the second-stage air outlet 342, an avoiding groove 333 which avoids.

The secondary cylinder 3 works, when the secondary piston 51 moves downwards, the volume in the secondary cylinder 3 is increased to generate negative pressure, and the air which is subjected to primary compression in the secondary air inlet channel 331 pushes the secondary air inlet baffle 35 to enter the secondary cylinder 3, so that air inlet work is completed; when the air pressure in the secondary cylinder 3 is balanced with the air pressure in the secondary air inlet 331, the secondary air inlet baffle 35 is restored to the original state and attached to the secondary air inlet 341, and the primary compressed air in the secondary air inlet 331 and the primary compressed air in the secondary cylinder 3 are isolated; when the secondary piston 51 moves upward, the primary compressed air is compressed again, the air pressure in the secondary cylinder 3 is increased, the air pressure difference between the inside of the secondary cylinder 3 and the inside of the secondary air inlet 331 further compresses the secondary air inlet baffle 35, and meanwhile, because the secondary exhaust passage 332 is provided with the avoidance groove 333 (refer to fig. 9), the air pressure difference between the inside of the secondary cylinder 3 and the inside of the secondary exhaust passage 332 enables the secondary compressed air to smoothly push away the secondary exhaust baffle 36, and the secondary compressed air enters the secondary exhaust passage 332 and outputs the compressed air; the secondary air inlet baffle 35 and the secondary exhaust baffle 36 are both strip-shaped, and can bear the pressure generated on the secondary air inlet baffle 35 and the secondary exhaust baffle 36 when compressed air flows, so that the working stability and the service life of the secondary cylinder 3 are ensured.

Referring to fig. 1, a pipe joint 62 is connected to the primary exhaust passage 241 of the primary cylinder 2 and the secondary intake passage 331 of the secondary cylinder 3 through threads, the other end of the pipe joint 62 is connected to the interstage air pipe 6, a pressure regulating valve 61 is arranged in the middle section of the interstage air pipe 6, because the real-time pressure a of the compressed air output by the primary cylinder 2 fluctuates within a certain range, a pressure taking point of the pressure regulating valve 61 is arranged behind the valve and is used for regulating the post-valve pressure to be constant B, namely the intake pressure of the secondary cylinder 3 is constant B, so that the intake stability of the secondary cylinder 3 is ensured, the primary compressed air can only flow into the secondary cylinder 3 from the primary exhaust passage 241 through the interstage air pipe 6, and the unidirectional flowability output after the secondary compression of the secondary cylinder 3 is ensured by the primary intake baffle 42, the primary exhaust baffle 26, the secondary intake baffle 35, the secondary exhaust baffle 36 and; meanwhile, the primary compressed air is cooled in the interstage air pipe 6 to a certain degree, so that the whole secondary compression process approaches isothermal compression, and compared with the process of compressing the air to a target compressed air (air pressure, air temperature and volume) at one time, partial energy consumption can be reduced by secondary compression.

The implementation principle of the embodiment is as follows: air in the atmosphere firstly enters the crankcase 1, then is sucked into the working cavity of the primary cylinder 2 to complete primary compression and then is output to the interstage air pipe 6, the air after primary compression contains more gas molecular weight in unit volume than the air with the same volume, the air after primary compression is cooled in the interstage air pipe 6 to a certain degree, and is sucked into the working cavity of the secondary cylinder 3 to complete secondary compression and then is output after pressure stabilization of the pressure regulating valve 61, and the output pressure is improved under the condition that the volume of the air compressor is not increased.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (9)

1. The utility model provides a second grade oil-free air compressor, includes crankcase (1) and sets up the cylinder on crankcase (1), the rotation is provided with the bent axle in crankcase (1), be connected with on the bent axle with cylinder complex piston unit, its characterized in that: the air cylinder comprises at least two primary cylinders (2) and a secondary cylinder (3), a primary air inlet channel and a primary air outlet channel (241) which are communicated with the atmosphere are arranged on the primary cylinders (2), a secondary air inlet channel (331) and a secondary air outlet channel (332) which outputs compressed air are arranged on the secondary cylinder (3), an inter-stage air pipe (6) is communicated between the primary air inlet channel and the secondary air inlet channel (331), and air in the inter-stage air pipe (6) can only flow in a one-way mode.

2. The secondary oil-free air compressor of claim 1, wherein: be provided with air compressor machine air inlet (11) on crankcase (1), the piston unit includes primary piston assembly (4), primary piston assembly (4) are including one-level piston (41) and one-level baffle (42) that admits air, the top surface of one-level piston (41) is provided with one-level air inlet (411), one-level baffle (42) fastening connection that admits air is in the top surface of one-level piston (41), one-level baffle (42) that admits air covers on one-level air inlet (411) for having elastic sheet metal.

3. The secondary oil-free air compressor as claimed in claim 2, wherein: the primary air inlet baffle (42) comprises an air inlet baffle inner ring (421) and an air inlet baffle outer ring (422) covering the primary air inlet (411), the air inlet baffle inner ring (421) is connected with the air inlet baffle outer ring (422) through an elastic air inlet baffle rod (423), and the air inlet baffle inner ring (421) is connected to the primary piston (41) through bolt threads.

4. The secondary oil-free air compressor as claimed in claim 2, wherein: the primary cylinder (2) comprises a primary cylinder cover assembly (23) and a primary cylinder body (21), the primary cylinder cover assembly (23) comprises a primary end cover (24), a primary partition plate (25) and a primary exhaust baffle (26), the upper end of the primary partition plate (25) is abutted to the lower end of the primary end cover (24), the lower end plate of the primary partition plate (25) is abutted to the upper end of the primary cylinder body (21), the primary partition plate (25) is provided with a primary exhaust port (251), the primary exhaust baffle (26) is tightly connected to the upper end of the primary partition plate (25), the primary exhaust baffle (26) is an elastic thin plate and covers the primary exhaust port (251), and a primary exhaust passage (241) is formed in the primary end cover (24).

5. The secondary oil-free air compressor as claimed in claim 4, wherein: the primary exhaust baffle (26) comprises an exhaust baffle inner ring (261) and an exhaust baffle outer ring (262) covering the primary exhaust port (251), the exhaust baffle inner ring (261) is connected with the exhaust baffle outer ring (262) through an elastic exhaust baffle rod (263), and the exhaust baffle inner ring (261) is connected to the primary partition plate (25) through bolt threads.

6. The secondary oil-free air compressor as claimed in claim 4, wherein: and the primary end cover (24) is provided with exhaust support rods (242) used for supporting the primary exhaust baffle (26) by the primary cylinder at intervals in the circumferential direction on one side facing the partition plate, and an exhaust gap exists between the top ends of the exhaust support rods (242) and the primary exhaust port (251).

7. The secondary oil-free air compressor of claim 1, wherein: and a pressure regulating valve (61) is arranged on the interstage air pipe (6).

8. The secondary oil-free air compressor of claim 1, wherein: the secondary cylinder (3) comprises a secondary cylinder cover assembly (32) and a secondary cylinder body, the secondary cylinder cover assembly (32) comprises a secondary end cover (33), a secondary partition plate (34), a secondary air inlet baffle (35) with one end fixedly connected to the lower end of the secondary partition plate (34) and a secondary air outlet baffle (36) with one end fixedly connected to the upper end of the secondary partition plate (34), the upper end of the secondary partition plate (34) is abutted against the lower end of the secondary end cover (33), the lower end of the secondary partition plate (34) is abutted against the upper end of the secondary cylinder body (31), a secondary air inlet (341) and a secondary air outlet (342) are arranged on the secondary partition plate (34), a secondary air inlet channel (331) communicated with the secondary air inlet (341) is arranged on the secondary end cover (33), and a secondary air outlet channel (332) communicated with the secondary air outlet, second grade air intake baffle (35) are kept away from fixed one end and are covered on second grade air inlet (341), second grade exhaust baffle (36) are kept away from fixed one end and are covered on second grade gas vent (342), second grade air intake baffle (35) with second grade exhaust baffle (36) are elastic sheet metal.

9. The secondary oil-free air compressor of claim 8, wherein: second grade baffle (34) inlay establish the laminating in second grade end cover (33) lower extreme, second grade intake duct (331) with second grade air inlet (341) junction periphery sets up the sealing member, second grade exhaust passage (332) with second grade gas vent (342) junction periphery sets up the sealing member, second grade end cover (33) lower extreme is provided with dodges dodge groove (333) of dodging second grade exhaust baffle (36) motion, dodge groove (333) with second grade exhaust passage (332) intercommunication.

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