阅读说明：本技术 一种节能气体无油压缩机及其多级压缩结构 (Energy-saving gas oil-free compressor and multistage compression structure thereof ) 是由 许建南 于 2020-12-16 设计创作，主要内容包括：本申请涉及一种节能气体无油压缩机及其多级压缩结构,包括缸体以及滑动连接在缸体内的活塞体,所述活塞体包括至少两个活塞,所述缸体内设置有供活塞独立滑动的压缩腔,所述压缩腔的容积逐级减小,较大容积所述压缩腔的出气口与较小容积压缩腔的进气口连通；在活塞体被驱使移动时,各个活塞均在压缩腔内各自压缩空气,其中容积较大的压缩腔完成压缩后的空气排出进入到下一级容积更小的压缩腔,从而可以使得压缩比得到大幅度提升,并且各个压缩腔各自压缩有效提高压缩效率,并且还具有节能以及低噪音的优点。(The application relates to an energy-saving gas oil-free compressor and a multistage compression structure thereof, and the energy-saving gas oil-free compressor comprises a cylinder body and a piston body connected in the cylinder body in a sliding manner, wherein the piston body comprises at least two pistons, a compression cavity for the pistons to independently slide is arranged in the cylinder body, the volume of the compression cavity is gradually reduced, and a gas outlet of the compression cavity with a larger volume is communicated with a gas inlet of the compression cavity with a smaller volume; when the piston body is driven to move, each piston respectively compresses air in the compression cavity, wherein the air after the compression cavity with larger volume is compressed is discharged and enters the compression cavity with smaller volume of the next stage, so that the compression ratio can be greatly improved, and each compression cavity is compressed respectively, thereby effectively improving the compression efficiency and further having the advantages of energy conservation and low noise.)

1. A multi-stage compression structure comprises a cylinder body (5) and a piston body (6) which is connected in the cylinder body (5) in a sliding way, and is characterized in that: the piston body (6) comprises at least two pistons, a compression cavity for the pistons to independently slide is arranged in the cylinder body (5), the volume of the compression cavity is gradually reduced, and the air outlet of the compression cavity with larger volume is communicated with the air inlet of the compression cavity with smaller volume.

2. The multi-stage compression architecture of claim 1, wherein: all be provided with annular (22) on the piston, sealing ring (23) have been cup jointed on annular (22), one side and annular (22) wall butt department of sealing ring (23) dorsad compression chamber be provided with compensating groove (24), compensating groove (24) and compression chamber intercommunication.

3. An energy-saving gas oil-free compressor, which comprises the multi-stage compression structure as claimed in any one of claims 1 to 2, and further comprises a machine body and a driving piece, wherein a crankshaft (2) is connected in the machine body in a rotating mode, a piston rod (7) of a piston body (6) is linked with the crankshaft (2) through a connecting rod (9), and the driving piece drives the crankshaft (2) to rotate.

4. The multi-stage compression architecture of claim 3, wherein: an interlayer (21) is arranged in the cylinder body (5), a water inlet (18) and a water outlet (19) which are communicated with the interlayer (21) are arranged on the cylinder body (5), the water inlet (18) is symmetrically arranged on two sides of the cylinder body (5), and the water outlet (19) is symmetrically arranged on two sides of the cylinder body (5).

5. The energy saving gas oil-free compressor according to claim 4, characterized in that: be provided with gland (13) in cylinder body (5), be provided with gland (15) on gland (13), gland (15) intussuseption is filled with filler (16), all set up the through-hole that supplies piston rod (7) to pass on gland (13) and gland (15), there is the interval in gland (15) and cylinder body (5) inner wall and forms cooling chamber (17), cooling chamber (17) are located intermediate layer (21) below and communicate with intermediate layer (21), water inlet (18) are seted up in the bottom that cylinder body (5) correspond cooling chamber (17).

6. The energy-saving gas oil-free compressor according to claim 5, characterized in that: the packing boxes (15) are axially arranged along the piston rod (7), and a sealing ring (20) is arranged between every two adjacent packing boxes (15).

7. An energy-saving gas oil-free compressor according to claim 3, characterized in that: the fuselage includes crankcase (1), installing port (26) have been seted up at the top of crankcase (1), the bottom of cylinder body (5) be provided with installation department (25) of the adaptation of installing port (26), when installation department (25) and installing port (26) cooperate, the axis of cylinder body (5) passes through the axis of rotation of bent axle (2).

8. An energy-saving gas oil-free compressor according to claim 3, characterized in that: one end of the crankshaft (2) penetrates out of the machine body, a flywheel (3) is arranged at the end part of the crankshaft, and a groove body (4) for connecting a belt is arranged on the flywheel (3).

9. The energy saving gas oil-free compressor of claim 8, wherein: one side of flywheel (3) is provided with supporting seat (27), rotate on supporting seat (27) and be connected with axis body (33) of fixing on flywheel (3), be provided with on supporting seat (27) and supply axis body (33) to rotate and be connected with bearing (28).

10. An energy-saving gas oil-free compressor according to claim 3, characterized in that: the output pipeline of the compressed air output by the compression cavity of the cylinder body (5) is provided with a cooler and a gas-liquid separator, the gas-liquid separator is provided with a pressure release valve, the pressure release valve is connected with an ejector (29), and the discharge port of the ejector (29) is used for being connected with a gas storage tank.

Technical Field

The application relates to the field of compressors, in particular to an energy-saving gas oil-free compressor and a multistage compression structure thereof.

Background

Air compressors are a common type of equipment for compressing air, and are classified into positive displacement compressors, piston compressors, rotary compressors, and sliding vane compressors according to their types.

The piston compressor mainly comprises a cylinder body, a piston, a crankcase, a crankshaft, a connecting rod, a motor and the like, wherein the piston is connected inside the cylinder body in a sliding mode, two ends of the connecting rod are hinged to the piston rod and the crankshaft to achieve linkage of the piston rod and the crankshaft, so that the crankshaft is driven to rotate by the aid of the motor, and the connecting rod is linked with the piston to do linear reciprocating motion in the cylinder body to achieve air compression.

In view of the above-mentioned related art, the inventor believes that a single cylinder generally realizes corresponding compression corresponding to a single piston, and the defects of low compression efficiency and small compression ratio exist.

Disclosure of Invention

In order to improve compression efficiency and compression ratio, the application provides an energy-saving gas oil-free compressor and a multistage compression structure thereof.

In a first aspect, the present application provides a multi-stage compression structure, which adopts the following technical scheme:

the utility model provides a multistage compression structure, includes cylinder body and the piston body of sliding connection in the cylinder body, the piston body includes two at least pistons, be provided with the compression chamber that supplies the piston to independently slide in the cylinder body, the volume of compression chamber reduces step by step, great volume the gas outlet of compression chamber communicates with the air inlet of less volume compression chamber.

Through adopting above-mentioned technical scheme, set up two at least pistons in the cylinder body, when the piston integument was ordered about and is removed, each piston all compressed air separately in the compression chamber, wherein the air discharge after the great compression chamber of volume accomplished the compression enters into the compression chamber that the next stage volume is littleer to can make the compression ratio obtain promoting by a wide margin, and each compression chamber compresses separately and effectively improves compression efficiency.

Optionally, all be provided with the annular on the piston, the sealing ring has been cup jointed on the annular, one side and the annular wall butt department of sealing ring dorsad compression chamber be provided with the compensating groove, the compensating groove communicates with the compression chamber.

Through adopting above-mentioned technical scheme, because less voluminous compression chamber pressure is very big, and then lead to the pressure differential of sealing ring both sides on the piston to be great easily, with the help of the setting of compensating groove, high-pressure air can the part circulate to the compensating groove in the compression chamber, can play the effect of balanced bearing sealing ring for the atmospheric pressure difference of both sides reduces as far as about the sealing ring, thereby makes the sealing ring more durable, and life is longer.

In a second aspect, the present application provides an energy-saving gas oil-free compressor, which adopts the following technical scheme:

the utility model provides an energy-conserving gaseous oil-free compressor, includes above-mentioned multistage compression structure, still includes fuselage and driving piece, the fuselage internal rotation is connected with the bent axle, the piston rod and the bent axle of piston body pass through the connecting rod linkage, the driving piece orders about the bent axle and rotates.

Through adopting above-mentioned technical scheme, the compressor has above-mentioned multistage compression structure, when the driving piece orders about the bent axle and rotates, drives the piston through the connecting rod and is reciprocating motion, realizes accomplishing air compression in the compression chamber to compression efficiency is high, and compression ratio is also high, can obtain the compressed air that pressure is bigger.

Optionally, an interlayer is arranged in the cylinder body, a water inlet and a water outlet which are communicated with the interlayer are arranged on the cylinder body, the water inlet is symmetrically arranged at the bottom of the interlayer, and the water outlet is symmetrically arranged at the top of the interlayer.

Through adopting above-mentioned technical scheme, the water inlet that sets up from bilateral symmetry lets in the intermediate layer simultaneously inside cools off the cylinder body, and the cooling water is discharged from the delivery port of top both sides simultaneously, takes away the heat on the cylinder body, reaches good cooling effect, and because water inlet and delivery port symmetry set up the homogeneity that keeps into water and go out water, thereby it is better to the refrigerated homogeneity of cylinder body, make the sealing ring on the inside piston can not appear wearing and tearing of not equidimension because of the difference in temperature on the cylinder wall.

Optionally, a packing gland is arranged in the cylinder body, a packing box is arranged on the packing gland, packing is filled in the packing box, through holes for the piston rod to pass through are formed in the packing gland and the packing box, a cooling cavity is formed between the packing box and the inner wall of the cylinder body at intervals and is located below the interlayer and communicated with the interlayer, and the water inlet is formed in the bottom of the cylinder body corresponding to the cooling cavity.

Traditional cooling method sets up the interlayer in the cylinder body and forms the cooling runner, the cooling effect is not good, through adopting above-mentioned technical scheme, through forming the cooling chamber between packing box and cylinder body inner wall, let in cooling intracavity cooling water can reach better cooling effect to inside packing with the contact of packing box outer wall directly, and cooling water gets into the back from the water inlet at first to the packing box cooling, then the water level constantly rises, follow-up cooling water that has the uniform temperature cools off the jar wall in compression chamber again, prevent the stress crack that the foundry goods arouses because of the cold and hot difference in temperature is big, thereby reach good cooling effect.

Optionally, the stuffing boxes are axially provided with a plurality of stuffing boxes along the piston rod, and a sealing ring is arranged between adjacent stuffing boxes.

Through adopting above-mentioned technical scheme, at first set up a plurality of stuffing boxes that set up along the piston rod axis, it can reach multistage sealed effect, and the setting up of sealing washer can improve the leakproofness between the adjacent stuffing box, blocks that compressed gas spills from the gap between the stuffing box that blocks that can be better blocks gas and passes through.

Optionally, the fuselage includes the crankcase, the installing port has been seted up at the top of crankcase, the bottom of cylinder body be provided with the installation department of the adaptation of installing port, when installation department and installing port cooperate, the axis of cylinder body passes through the axis of rotation of bent axle.

Through adopting above-mentioned technical scheme, with the help of the setting of installation department and installing port, when installing the cylinder body on the crankcase, directly make the installation department peg graft and can realize the cooperation and keep the concentricity in the installing port in step, still need carry out the mode of adjusting through the pull rod after traditional cooperation, convenient and fast more to simple structure and concentricity height.

Optionally, one end of the crankshaft penetrates through the machine body, a flywheel is arranged at the end of the crankshaft, and a groove body for connecting the belt is formed in the flywheel.

By adopting the technical scheme, the rotational inertia can be improved by means of the flywheel which is arranged when the crankshaft rotates, namely after the driving piece drives the crankshaft to rotate, the crankshaft can be driven to rotate continuously better by means of the rotational inertia of the flywheel, so that the current required by driving is effectively reduced, and the aim of corresponding energy saving is fulfilled; the setting of cell body makes the flywheel can directly act as the band pulley and uses, and the driving piece orders about the bent axle through belt drive's mode and rotates, compares in driving piece direct drive's mode easier, effectively simplifies the structure, realizes the multipurpose of flywheel.

Optionally, one side of flywheel is provided with the supporting seat, it fixes the axis body on the flywheel to rotate to be connected with on the supporting seat, be provided with on the supporting seat and supply the axis body to rotate and be connected with the bearing.

By adopting the technical scheme, the flywheel can be well supported by virtue of the arrangement of the supporting seat and the shaft body, and under the condition of having the supporting seat, the outer diameter of the flywheel can be larger, namely the flywheel can generate larger rotational inertia, so that the piston type air compressor can be matched with a frequency converter for use, namely under the condition of small external air consumption, the speed of driving the crankshaft to rotate can be reduced by frequency conversion, at the moment, the crankshaft can still keep good rotation by depending on the rotational inertia of the flywheel, the problem that the required current rapidly rises at the moment is reduced, and the defect that the traditional piston type belt air compressor cannot realize frequency conversion is solved; the arrangement of the bearing can reduce the friction resistance, so that the crankshaft can rotate more smoothly.

Optionally, an output pipeline of the compression cavity of the cylinder body for outputting compressed air is provided with a cooler and a gas-liquid separator, the gas-liquid separator is provided with a pressure release valve, the pressure release valve is connected with an ejector, and a discharge port of the ejector is used for being connected with a gas storage tank.

When externally not needing compressed air, the driving piece stop work, the inside high-pressure air that still has still exists of compressor, and the tradition is most directly fallen through the relief valve emission, has caused the energy waste like this, through the ejector is connected in vapour and liquid separator's relief valve department for high-pressure air reduces with outside air mixing pressure in the ejector, can well store in the gas holder, and follow-up other occasions that need low-pressure air of being convenient for are used, reach better energy-conserving purpose.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the piston body reciprocates vertically in the Z-shaped cylinder body, air compression is synchronously realized on at least two compression cavities, so that the gravity side grinding tendency is avoided, and the service life of a quick-wear part is prolonged;

2. the pressure difference on the two sides of the sealing ring is effectively balanced by setting the balance groove, so that the sealing ring can be effectively used for a longer time, and the service life is prolonged;

3. the same cooling structure is adopted for cooling the filler and the cylinder wall, so that the structure is simplified, and the cooling structure adopts a double-in and double-out mode to achieve the purpose of better cooling uniformity;

4. the flywheel is used for increasing weight and the supporting seat is used for protecting the crankshaft bearing overload, the defect that the traditional piston type compressor is difficult to use in a frequency conversion mode is overcome, the result that the inertia kinetic energy is unchanged after the frequency conversion and the speed reduction is achieved, and the energy is saved.

Drawings

FIG. 1 is an overall sectional view of an energy saving gas oil-free compressor according to an embodiment of the present application;

FIG. 2 is a structural diagram of a cooling cavity and an interlayer in an energy-saving gas oil-free compressor according to an embodiment of the present application;

FIG. 3 is an enlarged view at A in FIG. 2;

fig. 4 is a structural diagram of an ejector in the energy-saving gas oil-free compressor according to the embodiment of the present application.

Description of reference numerals: 1. a crankcase; 2. a crankshaft; 3. a flywheel; 4. a trough body; 5. a cylinder body; 6. a piston body; 61. a first piston; 62. a second piston; 7. a piston rod; 8. a crosshead; 9. a connecting rod; 10. a first compression chamber; 11. a second compression chamber; 12. an oil scraping seat; 13. a packing gland; 14. an oil scraper ring; 15. a stuffing box; 16. a filler; 17. a cooling chamber; 18. a water inlet; 19. a water outlet; 20. a seal ring; 21. an interlayer; 22. a ring groove; 23. a seal ring; 24. a balancing tank; 25. an installation part; 26. an installation port; 27. a supporting seat; 28. a bearing; 29. an ejector; 30. a high pressure gas inlet; 31. a low pressure gas collection port; 32. a normal pressure air suction inlet; 33. a shaft body.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses an energy-saving gas oil-free compressor.

Referring to fig. 1, the energy-saving gas oil-free compressor comprises a body, a multi-stage compression structure and a driving piece, wherein the body comprises a crankcase 1, a crankshaft 2 is rotatably connected in the crankcase 1, one end of the crankshaft 2 extends out of the crankcase 1, a flywheel 3 is fixed on the part of the crankshaft 2 extending out of the crankcase 1, and a groove body 4 for connecting a belt is arranged on the flywheel 3; the driving piece comprises a motor, a belt wheel is arranged on an output shaft of the motor, and the belt wheel is connected with the flywheel 3 through a belt, so that the crankshaft 2 is driven to rotate by the motor. The flywheel 3 can be additionally provided with a balancing weight according to the actual balancing weight.

As shown in fig. 1, the multistage compression mechanism includes a cylinder body 5 installed above a crankcase 1, the cylinder body 5 is vertically arranged, a piston body 6 is connected to the cylinder body 5 in a vertical sliding manner, a compression cavity for sliding the piston body 6 is formed in the cylinder body 5, a piston rod 7 is fixed on the piston body 6, a crosshead 8 is fixed at one end, facing the crankcase 1, of the piston rod 7, a connecting rod 9 is arranged between the crosshead 8 and the crankshaft 2, two ends of the connecting rod 9 are respectively hinged to the crosshead 8 and the crankshaft 2, and therefore the piston body 6 is continuously driven to do linear reciprocating motion in the compression cavity in the rotation process of the crankshaft 2 to achieve air compression.

As shown in fig. 1, the piston body 6 includes at least 2 pistons, in this embodiment, the pistons include 2 pistons, which are respectively a first piston 61 and a second piston 62, the first piston 61 and the second piston 62 are an integral body, the compression cavities are two and are respectively a first compression cavity 10 and a second compression cavity 11, and in other embodiments, the number of the pistons and the compression cavities may also be 3, 4, etc.; the first piston 61 is matched with the first compression cavity 10 for use, the second piston 62 is matched with the second compression cavity 11 for use, the first piston 61 is positioned below the second piston 62, the horizontal cross-sectional area of the first piston 61 is larger than that of the second piston 62, the first compression cavity 10 is arranged on one side, facing the box 1 of the crankshaft 2, of the first piston 61, the second compression cavity 11 is arranged on one side, facing away from the first piston 61, of the second piston 62, and the volume of the first compression cavity 10 is larger than that of the second compression cavity 11; meanwhile, the first compression cavity 10 and the second compression cavity 11 are both provided with an air inlet and an air outlet, an air inlet valve is arranged on the air inlet, an air outlet valve is arranged at the air outlet, the air inlet valve and the air outlet valve are both one-way valves, and the air outlet of the first compression cavity 10 is communicated with the air inlet of the second compression cavity 11 through a vent pipe.

When the piston body 6 is driven to move downwards, the first piston 61 applies work to compress air in the first compression cavity 10 until the air outlet is opened to discharge primary compressed air after the piston body reaches corresponding pressure, and the second piston 62 moves downwards to be in an air suction state, namely the primary compressed air enters the second compression cavity 11 through the air inlet of the second compression cavity 11; when the piston body 6 is driven to move upwards, the first piston 61 moves upwards in the cylinder body 5, the first compression cavity 10 is in a suction state, external air enters the first compression cavity 10 through an air inlet on the first compression cavity 10, the second piston 62 moves upwards in the second compression cavity 11 for secondary compression, and the air is discharged through an air outlet after being compressed to a certain pressure; the secondary compression of the air can be realized by continuously driving the piston body 6 to reciprocate, the compression effect is high, and the volume of the first compression cavity 10 is larger than that of the second compression cavity 11, so that the compression ratio of the secondary compression is larger, and the compressed air with larger pressure can be obtained.

In addition, a cooler and a gas-liquid separator are sequentially connected to a vent pipe which is communicated with an air outlet of the first compression cavity 10 and an air inlet of the second compression cavity 11, the cooler is a water-cooled cooler, and due to the fact that the temperature of compressed air is high, secondary compression is conveniently performed after the air is cooled, liquid water can be generated in the cooling process, the liquid water is separated by the gas-liquid separator, and therefore compressed air introduced into the second compression cavity 11 can be better compressed in a secondary mode.

As shown in fig. 1 and 2, an oil scraping seat 12 and a packing gland 13 are sequentially arranged in a cylinder 5 from bottom to top, through holes for a piston rod 7 to pass through are formed in the centers of the oil scraping seat 12 and the packing gland 13, and an oil scraping ring 14 is arranged on the oil scraping seat 12 and can play a corresponding oil scraping role to prevent oil from entering an upper compression cavity; the packing gland 13 is provided with a packing box 15, the packing box 15 is filled with packing 16, the packing 16 is mainly tetrafluoroethylene, and the sealing performance of the joint is kept by the packing 16, so that compressed air in the compression cavity cannot leak.

As shown in fig. 2, a space exists between the stuffing box 15 and the inner wall of the cylinder 5 and forms a cooling cavity 17, a water inlet 18 is arranged at the bottom of the outer wall of the cylinder 5 corresponding to the cooling cavity 17, the water inlet 18 is symmetrically arranged at two sides of the cylinder 5, a water outlet 19 is arranged at the upper position of the cylinder 5, and the water outlet 19 is also symmetrically arranged on the cylinder 5; when using like this, cooling water enters into cooling chamber 17 simultaneously from two water inlets 18, then the water level is constantly risen until discharging from two delivery ports 19, takes away the heat on the stuff box 15, and the cooling degree of consistency to stuff box 15 is good during, reaches better cooling effect.

As shown in fig. 2, a plurality of stuffing boxes 15 are arranged along the axial direction of the piston rod 7, a sealing ring 20 is arranged between the stuffing boxes 15, and the sealing between the stuffing boxes 15 is improved by the sealing ring 20, so that moisture is prevented from entering the stuffing boxes 15 to affect the sealing effect.

As shown in fig. 2, an interlayer 21 is arranged at a position of the cylinder 5 corresponding to the compression cavity, the interlayer 21 is positioned between the cooling cavity 17 and the water outlet 19, the interlayer 21 is communicated with the cooling cavity 17, and communication ports of the interlayer 21 communicated with the cooling cavity 17 are symmetrically arranged and staggered with the water inlet 18 in the circumferential direction; therefore, moisture entering from the water inlet 18 firstly passes through the cooling cavity 17 to cool the stuffing box 15, and has a certain temperature after entering the interlayer 21, so that stress cracks of castings caused by large cold and hot temperature difference are effectively prevented, a good cooling effect is achieved, and the moisture also enters symmetrically from the water through hole to keep the cooling uniformity; in addition, the water through opening and the water inlet 18 are staggered in the circumferential direction, so that water flow can rotate in the cavity, and the cooling effect is better.

As shown in fig. 3, the outer walls of the first piston 61 and the second piston 62 are both provided with the ring groove 22, and the ring groove 22 is sleeved with the sealing ring 23, the sealing ring 23 is an F4 ring, the sealing ring 23 abuts against the inner wall of the cylinder 5 to realize sealing, due to the existence of the compression cavity, the pressure of one side of the first piston 61 or the second piston 62 close to the compression cavity is far greater than that of the other side, so as to form a larger pressure difference, wherein the second piston 62 is more obvious, so as to easily deform the sealing ring 23 to influence the service life of the sealing ring, in the figure, the second piston 62 is taken as an example, when in actual use, the sealing ring 23, the top wall and the inner side wall of the ring groove 22 have a small gap, the bottom wall of the sealing ring 23 abuts against the bottom wall of the ring groove 22, in this embodiment, the balancing groove 24 is provided at the abutting position of one side of the sealing ring 23, which is back to the second compression cavity 11, and the balancing groove 24, the pressure difference on the two sides of the sealing ring 23 is effectively reduced, and therefore the service life of the sealing ring 23 is greatly prolonged.

As shown in fig. 1, the bottom of the cylinder 5 is provided with the mounting portion 25, the top of the crankcase 1 is provided with the mounting opening 26, the mounting portion 25 is adapted to the mounting opening 26 so as to facilitate mounting of the cylinder 5, and after the mounting portion 25 is matched with the mounting opening 26, the axis of the cylinder 5 is concentric with the axis of the crankshaft 2, which is more convenient and faster than the conventional mounting method that the position of the cylinder 5 needs to be adjusted by a pull rod to keep concentric.

As shown in fig. 1, a support 27 is disposed on a side of the flywheel 3 away from the crankcase 1, a shaft 33 fixed to the flywheel 3 is rotatably connected to the support 27, a bearing 28 for the shaft 33 to penetrate is disposed in the support 27, the arrangement of the bearing 28 can effectively reduce friction resistance, improve the smoothness of rotation of the crankshaft 2, the support 27 and the shaft 33 can support the flywheel 3 well, with the support base 27, the outer diameter of the flywheel 3 can be set larger, thereby increasing the moment of inertia of the flywheel 3, so that the piston air compressor can be adapted to frequency conversion, the rotating speed of the crankshaft 2 can be adjusted according to the air supply amount, when the rotating speed of the crankshaft 2 is reduced, the flywheel 3 still has uniform and large moment of inertia, a good rotating state can be still kept, the current of the motor cannot rise sharply, and the defect that the traditional piston type air compressor cannot be used together with a frequency converter is overcome.

In addition, the gas-liquid separator is provided with a pressure relief valve, namely when high-pressure air is not needed outside, compressed air is still reserved in the compressor at the moment, and the high-pressure air in the compressor is usually discharged through the pressure relief valve, so that energy waste is caused; connect ejector 29 on the relief valve in this embodiment, as shown in fig. 4, ejector 29 includes high-pressure gas inlet 30 and low-pressure gas collection mouth 31, high-pressure gas inlet 30 and low-pressure gas collection mouth 31 set up relatively, ordinary pressure air suction inlet 32 has been seted up to one side at ejector 29, high-pressure gas inlet 30 is used for being connected with the relief valve, low-pressure gas collection mouth 31 is used for connecting the gas holder, thereby after opening the relief valve, bring into the outside air through ordinary pressure air suction inlet 32 during high-pressure gas gets into ejector 29, make overall pressure reduce, then collect in the gas holder from low-pressure gas collection mouth 31 discharge, realize the recycle to compressed air with this, reduce the waste of the energy, it is more energy-conserving.

The implementation principle of the energy-saving gas oil-free compressor in the embodiment of the application is as follows: the motor is started to drive the crankshaft 2 to rotate by means of belt transmission, then the connecting rod 9 is used for linking the piston body 6 to reciprocate in the cylinder body 5 to realize air compression, wherein air in the first compression cavity 10 is discharged from a discharge port after primary compression, and is cooled by a water-cooled cooler, and after liquid in the air is separated by a gas-liquid separator, the air is introduced into the second compression cavity 11 for secondary compression, and finally high-pressure air is obtained after the compressed air after secondary compression is cooled and subjected to gas-liquid separation, and is used for required scenes; when the motor is turned off during the non-working process, the residual high-pressure gas in the compressor is discharged through the pressure release valve, and is collected into the low-pressure gas storage tank after being mixed and depressurized with the external air through the ejector 29, so that the compressed gas is recycled and stored, and the purpose of energy conservation is achieved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.