Oil-free nitrogen and air dual-purpose supercharger

Abstract

The invention provides an oil-free nitrogen and air dual-purpose supercharger which comprises a base, a supercharger body is arranged on the base, a plurality of compression devices communicated with one another are arranged on the outer side of the supercharger body and used for being started in sequence and compressing media step by step, and a medium outlet of the last compression device is provided with a medium discharging pipeline. A four-stage gas-liquid separation device is arranged at the end of the medium discharging pipeline, a medium conveying pipeline is arranged at a medium outlet of the four-stage gas-liquid separation device, a three-way valve is arranged at the end of the medium conveying pipeline, and two medium outlets of the three-way valve are a compressed nitrogen outlet and a compressed air outlet respectively. And a drying filter is arranged at the compressed nitrogen outlet and is used for drying the nitrogen subjected to four-stage compression. The supercharger has the advantages of being not only suitable for oil-free nitrogen pressurization, but also suitable for air extrusion.

Description

Technical Field

[0001] The present invention relates to a supercharger, in particular to an oil-free nitrogen and air dual-purpose supercharger. Background Art

[0002] Currently, Chinese patent publication number CN214887554U discloses a multi-stage booster air compressor comprising a plurality of sequentially connected compression devices, which are activated sequentially and compress air stage by stage. Each of the compression devices is provided with a first cooling device connected thereto. The plurality of compression devices comprise a first-stage compressor, a second-stage compressor, a third-stage compressor, and a fourth-stage compressor, which are sequentially connected in series. The first-stage compressor is symmetrically arranged with the second-stage compressor, and the third-stage compressor is symmetrically arranged with the fourth-stage compressor. However, if the above-mentioned compressor is used to pressurize nitrogen, since the dew point of nitrogen is different from that of air, water may still be present in the pressurized nitrogen. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide an oil-free nitrogen and air dual-purpose booster, which has the advantage of being applicable not only to oil-free nitrogen pressurization but also to air extrusion.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: an oil-free nitrogen and air two-stage booster, comprising a base, a booster main body is arranged on the base, and a plurality of compression devices connected to each other are arranged on the outside of the booster main body, which are used to start in sequence and compress the medium step by step. The plurality of compression devices include a first-stage compression device, a second-stage compression device, a third-stage compression device and a fourth-stage compression device. The first-stage compression device and the second-stage compression device are symmetrically distributed on both sides of the bottom of the booster main body, and the third-stage compression device and the fourth-stage compression device are symmetrically distributed on both sides of the top of the booster main body. The third-stage compression device is located above the first-stage compression device, and the medium outlet of the first-stage compression device and the medium inlet of the second-stage compression device are connected through a first-stage connecting pipe, and a first-stage gas-liquid is provided in the middle of the first-stage connecting pipe. A separation device, a secondary connecting pipe is provided between the medium outlet of the secondary compression device and the medium inlet of the tertiary compression device, a secondary gas-liquid separation device is provided in the middle of the secondary connecting pipe, a tertiary connecting pipe is provided between the medium outlet of the tertiary compression device and the medium inlet of the quaternary compression device, a tertiary gas-liquid separation device is provided in the middle of the tertiary connecting pipe, a medium discharge pipe is provided at the medium outlet of the quaternary compression device, a quaternary gas-liquid separation device is provided at the end of the medium discharge pipe, a medium transmission pipe is provided at the medium outlet of the quaternary gas-liquid separation device, a three-way valve is provided at the end of the medium transmission pipe, the two medium outlets of the three-way valve are a compressed nitrogen outlet and a compressed air outlet respectively, and a drying filter is provided at the compressed nitrogen outlet for drying the nitrogen compressed by the four stages.

[0005] Through the above technical solution, when in use, the control medium enters the first-stage compression device from the medium inlet of the first-stage compression device, the first-stage compression device will perform preliminary compression on the medium, the medium compressed by the first-stage compression device will enter the first-stage connecting pipe, the first-stage gas-liquid separation device arranged in the middle of the first-stage connecting pipe will separate the water in the medium, and then the medium will enter the second-stage compression device through the first-stage connecting pipe, the second-stage compression device will compress the medium again, the medium compressed by the second-stage compression device will enter the second-stage connecting pipe, the second-stage gas-liquid separation device arranged in the middle of the second-stage connecting pipe will separate the water in the medium, and then the medium will enter the third-stage compression device through the second-stage connecting pipe, the third-stage compression device will further compress the medium, the medium compressed by the third-stage compression device will enter the third-stage connecting pipe, the third-stage gas-liquid separation device arranged in the middle of the third-stage connecting pipe The gas-liquid separation device separates the water in the medium, and then the medium will enter the four-stage compression device through the three-stage connecting pipe. The four-stage compression device will perform the final compression on the medium. The medium compressed by the four-stage compression device will enter the four-stage gas-liquid separation device through the medium discharge pipe. The four-stage gas-liquid separation device separates the water in the medium, and then the medium will enter the medium transmission pipeline. At this time, if the compressed medium is nitrogen, the compressed nitrogen outlet is controlled by a three-way valve to be connected to the medium transmission pipeline. In this way, the compressed nitrogen in the medium transmission pipeline will enter the drying filter. The drying filter will dry the compressed nitrogen and further remove the residual water in the compressed nitrogen. If the compressed medium is air, the compressed air outlet is controlled by a three-way valve to be connected to the medium transmission pipeline. In this way, the compressed air in the medium transmission pipeline can be directly supplied through the compressed air outlet. In summary, the above-mentioned booster has the advantage of being suitable not only for oil-free nitrogen pressurization, but also for air extrusion.

[0006] Preferably, a first installation chamber with an expanded opening is formed between the second-stage compression device and the fourth-stage compression device, and the middle portion of the first-stage connecting pipe is spirally arranged in the first installation chamber.

[0007] Through the above technical solution, the middle part of the first-level connecting pipe is spirally arranged in the first installation chamber. The first-level connecting pipe arranged in this way is longer and has a larger area in contact with the air, which can more effectively cool the compressed medium flowing through the first-level connecting pipe.

[0008] Preferably, a second installation chamber with an expanded opening is formed between the first-stage compression device and the third-stage compression device, and the middle portion of the second-stage connecting pipe is spirally arranged in the second installation chamber.

[0009] Through the above technical solution, the middle part of the secondary connecting pipe is spirally arranged in the first installation chamber. The secondary connecting pipe arranged in this way is longer and has a larger area in contact with the air, which can more effectively cool the compressed medium flowing through the secondary connecting pipe.

[0010] Preferably, a third installation chamber with an expanded opening is formed between the third-stage compression device and the fourth-stage compression device, and the middle portion of the third-stage connecting pipe is spirally arranged in the third installation chamber.

[0011] Through the above technical solution, the middle part of the three-stage connecting pipe is spirally arranged in the first installation chamber. The three-stage connecting pipe arranged in this way is longer and has a larger area in contact with the air, which can more effectively cool the compressed medium flowing through the three-stage connecting pipe.

[0012] Preferably, a support frame is provided at the upper end of the base, the support frame is arranged side by side with the supercharger body, and the medium discharge pipe is spirally provided on the support frame.

[0013] Through the above technical solution, the medium discharge pipe is spirally arranged on the support frame. The medium discharge pipe arranged in this way is longer and has a larger area in contact with the air, which can more effectively cool the compressed medium flowing through the medium discharge pipe.

[0014] Preferably, the support frame includes a support disc arranged on the supercharger body, and fixed support rods evenly arranged on the support disc along the circumference. A fixed pressure plate is provided on each of the fixed support rods, and the fixed pressure plate is provided with a plurality of limiting grooves along the length direction toward one side of the fixed support rod for the medium discharge pipe to pass through.

[0015] The above technical solution comprises a support frame comprising a support disc and a plurality of fixed rods, requiring less material and thus helping to reduce the production cost of the supercharger. The fixed pressure plate is provided with a plurality of limiting slots for the medium discharge pipe to pass through. The fixed pressure plate cooperates with the fixed support rods to support and limit the medium discharge pipe.

[0016] Preferably, the fixed pressure plate is provided with a countersunk hole between the two limiting grooves, and a locking screw is provided in each countersunk hole. The threaded section of the locking screw passes through the countersunk hole and is threadedly connected to the fixed support rod to press and fix the fixed pressure plate to the fixed support rod.

[0017] Through the above technical solution, the fixed pressure plate is tightened and fixed to the fixed support rod by the locking screw, which has the advantage of being more convenient to disassemble and assemble.

[0018] Preferably, the limiting groove includes a limiting portion with a semicircular cross-section and a connecting portion with a rectangular cross-section, the connecting portion passes through the side wall of the fixed pressure plate toward the fixed support rod, and an elastic clamp is provided in the limiting groove, the opening of the elastic clamp faces one side of the fixed support rod, which is used to clamp and fix the medium discharge pipe, and the curvature of the elastic clamp is the same as that of the limiting portion.

[0019] Through the above technical solution, the elastic clamp can clamp and fix the medium discharge pipe entering the limiting groove, so as to improve the connection stability of the medium discharge pipe.

[0020] Preferably, a limiting slide groove is provided at the two inner groove walls opposite to each other of the connecting portion, and the extension direction of the limiting slide groove is perpendicular to the extension direction of the limiting through groove, and the two sides of the elastic clamp are slidably engaged in the limiting slide groove, and a guide block is provided at the two inner groove walls opposite to each other of the connecting portion, and the two guide blocks are respectively located on the side of the two limiting slide grooves close to the fixed support rod, and the guide block is penetrated by a mounting through hole, and the two ends of the elastic clamp pass through the mounting through holes of the two guide blocks respectively, so that the two ends of the elastic clamp are in an open state, and the end of the guide block away from the fixed support rod is provided with a tapered guide hole, and the small end of the tapered guide hole is connected with the mounting through hole, so as to guide the end of the elastic clamp to extend into the mounting through hole.

[0021] Through the above technical solution, when the medium discharge pipe needs to be placed inside the limiting groove, the elastic clamp is controlled to move toward the outside of the limiting groove. When the end of the elastic clamp enters the conical guide hole, the conical guide hole will guide the end of the elastic clamp into the installation hole, so that the opening part of the elastic clamp gradually opens, so that the medium discharge pipe can be more conveniently placed inside the elastic clamp. When the medium discharge pipe enters the elastic clamp and pushes the elastic clamp toward the inside of the limiting groove, when the end of the elastic clamp is separated from the conical guide hole, the end of the elastic clamp will be reset under the elastic action and hold the medium discharge pipe tightly, so as to limit the medium discharge pipe.

[0022] Preferably, a locking through hole is provided at a position opposite to the fixed pressure plate and the limiting through slot, and the locking through hole is connected to the middle part of the corresponding limiting through slot. A connecting rope is passed through the locking through hole, one end of the connecting rope is tightly tied and fixed to the elastic clamp, and the other end of the connecting rope extends out of the locking through hole.

[0023] Through the above technical solution, after the medium discharge pipe is clamped and fixed using the elastic clamp, the connecting rope is pulled to the end protruding from the fixed pressure plate until the elastic clamp is tightly attached to the inner wall of the limiting part. After that, the length of the connecting rope can be fixed by clamping the connecting rope or by tying a knot to fix the elastic clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an embodiment; Figure 2 A partial schematic diagram of an embodiment Figure 1 ; Figure 3 A partial schematic diagram of an embodiment Figure 2 ; Figure 4 A partial schematic diagram of an embodiment Figure 3 ; Figure 5 is a structural diagram of the support frame; Figure 6 for Figure 5 A magnified view of part A; Figure 7 Schematic diagram of the structure of the drying filter.

[0025] Figure numerals: 1, base; 2, booster body; 3, first-stage compression device; 4, second-stage compression device; 5, third-stage compression device; 6, fourth-stage compression device; 7, first-stage connecting pipe; 8, first-stage gas-liquid separation device; 9, second-stage connecting pipe; 10, second-stage gas-liquid separation device; 11, third-stage connecting pipe; 12, third-stage gas-liquid separation device; 13, medium discharge pipe; 14, fourth-stage gas-liquid separation device; 15, medium transmission pipe; 16, three-way valve; 17, compressed nitrogen outlet; 18, compressed air outlet; 19, drying filter; 191, filter body; 192, filter inner core; 1921, steel outer sleeve; 1922, steel inner sleeve; 1923, water absorption filter; 20, first installation chamber; 21, second installation chamber; 22 , the third installation chamber; 23, support frame; 231, support disc; 232, fixed support rod; 233, fixed pressure plate; 24, limiting groove; 241, limiting part; 242, connecting part; 25, countersunk hole; 26, locking screw; 27, elastic clamp; 28, limiting slide groove; 29, guide block; 30, mounting hole; 31, tapered guide hole; 32, locking hole; 33, connecting rope; 34, nitrogen inlet; 35, nitrogen outlet; 36, mounting ring; 37, external air inlet; 38, internal air inlet; 39, guide groove; 40, guide rib; 41, positioning ring groove; 42, positioning convex ring; 43, stop block; 44, return spring; 45, transmission shaft; 46, tapered transmission wheel; 47, servo motor; 48, tapered drive wheel. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0027] An oil-free nitrogen and air dual-purpose booster, such as Figures 1 to 7 As shown, it includes a base 1, on which a supercharger body 2 is arranged. A plurality of compression devices that are interconnected are arranged on the outside of the supercharger body 2 for starting in sequence and compressing the medium step by step.

[0028] Several compression devices include a first-stage compression device 3, a second-stage compression device 4, a third-stage compression device 5 and a fourth-stage compression device 6. The first-stage compression device 3 and the second-stage compression device 4 are symmetrically distributed on both sides of the bottom of the booster body 2, and the third-stage compression device 5 and the fourth-stage compression device 6 are symmetrically distributed on both sides of the top of the booster body 2. The third-stage compression device 5 is located above the first-stage compression device 3.

[0029] The medium outlet of the first-stage compression device 3 is connected to the medium inlet of the second-stage compression device 4 via a first-stage connecting pipe 7, and a first-stage gas-liquid separation device 8 is provided in the middle of the first-stage connecting pipe 7. A second-stage connecting pipe 9 is provided between the medium outlet of the second-stage compression device 4 and the medium inlet of the third-stage compression device 5, and a second-stage gas-liquid separation device 10 is provided in the middle of the second-stage connecting pipe 9. A third-stage connecting pipe 11 is provided between the medium outlet of the third-stage compression device 5 and the medium inlet of the fourth-stage compression device 6, and a third-stage gas-liquid separation device 12 is provided in the middle of the third-stage connecting pipe 11. A medium discharge pipe 13 is provided at the medium outlet of the four-stage compression device 6, and a four-stage gas-liquid separation device 14 is provided at the end of the medium discharge pipe 13. A medium transmission pipe 15 is provided at the medium outlet of the four-stage gas-liquid separation device 14, and a three-way valve 16 is provided at the end of the medium transmission pipe 15. The two medium outlets of the three-way valve 16 are respectively a compressed nitrogen outlet 17 and a compressed air outlet 18. A drying filter 19 is provided at the compressed nitrogen outlet 17 to dry the nitrogen compressed by the four stages.

[0030] A flared first installation chamber 20 is formed between the secondary compression device 4 and the quaternary compression device 6, and the central portion of the primary connecting pipe 7 is spirally disposed in the first installation chamber 20. A flared second installation chamber 21 is formed between the primary compression device 3 and the tertiary compression device 5, and the central portion of the secondary connecting pipe 9 is spirally disposed in the second installation chamber 21. A flared third installation chamber 22 is formed between the tertiary compression device 5 and the quaternary compression device 6, and the central portion of the tertiary connecting pipe 11 is spirally disposed in the third installation chamber 22.

[0031] A support frame 23 is provided at the upper end of the base 1, juxtaposed with the supercharger body 2. The medium discharge pipe 13 is spirally mounted on the support frame 23. The support frame 23 comprises a support disc 231 mounted on the supercharger body 2 and fixed rods 232 uniformly arranged along the circumference of the support disc 231. Each fixed rod 232 is provided with a fixed pressure plate 233. The fixed pressure plate 233 has a plurality of limiting slots 24 extending along its length toward the fixed rod 232, through which the medium discharge pipe 13 passes. The fixed pressure plate 233 has a countersunk hole 25 located between the two limiting slots 24. Each countersunk hole 25 is provided with a locking screw 26. The threaded section of the locking screw 26 passes through the countersunk hole 25 and is threadedly connected to the fixed rod 232, thereby pressing the fixed pressure plate 233 against the fixed rod 232.

[0032] The limiting groove 24 includes a limiting portion 241 with a semicircular cross-section and a connecting portion 242 with a rectangular cross-section. The connecting portion 242 passes through the side wall of the fixed pressure plate 233 toward the fixed support rod 232. An elastic clamp 27 is provided in the limiting groove 24. The opening of the elastic clamp 27 faces the side of the fixed support rod 232 to clamp and fix the medium discharge pipe 13. The curvature of the elastic clamp 27 is the same as that of the limiting portion 241. The two inner groove walls opposite to each other of the connecting portion 242 are both provided with a limiting slide groove 28, and the extension direction of the limiting slide groove 28 is perpendicular to the extension direction of the limiting through groove 24. The two sides of the elastic clamp 27 are respectively slidably clamped in the limiting slide groove 28, and the two inner groove walls opposite to each other of the connecting portion 242 are both provided with a guide block 29. The two guide blocks 29 are respectively located on the side of the two limiting slide grooves 28 close to the fixed support rod 232. The guide blocks 29 are penetrated by a mounting through hole 30. The two ends of the elastic clamp 27 pass through the mounting through holes 30 of the two guide blocks 29 respectively, so that the two ends of the elastic clamp 27 are in an open state. The end of the guide block 29 away from the fixed support rod 232 is provided with a tapered guide hole 31, and the small end of the tapered guide hole 31 is connected to the mounting through hole 30 to guide the end of the elastic clamp 27 to extend into the mounting through hole 30. The ends of the guide blocks 29 close to the fixed support rods 232 are provided with guide slopes for guiding the medium discharge pipe 13 to be clamped between the two guide blocks 29 .

[0033] A locking through hole 32 is provided at the position opposite to the fixed pressure plate 233 and the limiting through slot 24. The locking through hole 32 is connected to the middle part of the corresponding limiting through slot 24. A connecting rope 33 is passed through the locking through hole 32. One end of the connecting rope 33 is tightly fixed to the elastic clamp 27, and the other end of the connecting rope 33 extends out of the locking through hole 32.

[0034] The filter dryer 19 includes a filter body 191 and a filter core 192 disposed within the filter body 191. A nitrogen inlet 34 is provided on the side of the filter body 191, through which nitrogen, after four stages of compression, enters the filter core 192. A nitrogen outlet 35 is provided at the bottom of the filter body 191, through which the compressed nitrogen in the filter body 191 is discharged. A mounting ring 36 is provided on the inner bottom of the filter body 191, coaxially arranged with and surrounding the nitrogen outlet 35. The filter core 192 is embedded within the mounting ring 36 to absorb water from the nitrogen flowing through it.

[0035] The filter core 192 comprises a steel outer sleeve 1921, a steel inner sleeve 1922 positioned within the outer sleeve 1921, and a water-absorbing filter 1923 disposed within the inner sleeve 1922. Several external air inlet holes 37 are evenly distributed on the outer sleeve 1921. Internal air inlet holes 38 are positioned opposite the external air inlet holes 37 in the inner sleeve 1922. The internal air inlet holes 38 have the same diameter as the external air inlet holes 37, and the internal air inlet holes 38 are in one-to-one communication with the external air inlet holes 37. Compressed nitrogen entering the filter body 191 passes through the external air inlet holes 37 and the internal air inlet holes 38 in sequence, and comes into contact with the water-absorbing filter 1923, thereby removing any water contained in the compressed nitrogen.

[0036] A guide groove 39 is provided on the inner side of the steel outer sleeve 1921. A guide rib 40 is provided on the outer side of the steel inner sleeve 1922. The guide rib 40 slides inside the guide groove 39. The guide rib 40 cooperates with the guide groove 39 to restrict the steel inner sleeve 1922 to slide axially within the steel outer sleeve 1921.

[0037] A circumferential positioning groove 41 is defined on the inner side of the steel inner sleeve 1922. A circumferential positioning protrusion 42 is provided on the outer side of the water-absorbing filter 1923. The positioning protrusion 42 slides inside the positioning groove 41. The positioning protrusion 42 cooperates with the positioning groove 41 to restrict the water-absorbing filter 1923 to circumferential rotation within the steel inner sleeve 1922.

[0038] A stopper 43 is detachably provided on the inner side of the steel outer sleeve 1921 , and the stopper 43 is located at the lower end of the steel inner sleeve 1922 . When the lower end of the steel inner sleeve 1922 abuts against the stopper 43 , the outer air inlet 37 and the inner air inlet 38 are dislocated up and down.

[0039] A return spring 44 is provided inside the filter body 191. One end of the return spring 44 is connected to the inner bottom of the filter body 191, and the other end is connected to the steel inner sleeve 1922. The return spring 44 is used to apply an upward elastic force to the steel inner sleeve 1922, so that the inner air inlet 38 on the steel inner sleeve 1922 is connected to the outer air inlet 37 on the steel outer sleeve 1921.

[0040] The nitrogen outlet 35 is offset from the central axis of the water-absorbing filter 1923. A drive shaft 45 is provided at the lower end of the water-absorbing filter 1923. The end of the drive shaft 45 away from the water-absorbing filter 1923 extends downward through the filter body 191. A conical drive wheel 46 is coaxially provided at the end of the drive shaft 45 exposed from the filter body 191, with the small end of the conical drive wheel 46 located on the side of the conical drive wheel 46 away from the water-absorbing filter 1923. A servo motor 47 is provided below the filter body 191, with the output shaft of the servo motor 47 facing the filter body 191. A conical drive wheel 48 is provided on the output shaft of the servo motor 47, with the small end of the conical drive wheel 48 located on the side of the conical drive wheel 48 away from the servo motor 47.

[0041] As water absorption screen 1923 absorbs water from the compressed nitrogen, its weight increases, causing the steel inner sleeve 1922 to continuously move downward. When sufficient water is absorbed by water absorption screen 1923, the steel inner sleeve 1922 abuts against the inner bottom of the filter body 191, and the conical drive wheel 46 contacts the conical drive wheel 48. The operator can determine whether water absorption screen 1923 is full of water by observing the relative positions of the conical drive wheel 46 and the conical drive wheel 48, and can temporarily shut down the supercharger accordingly. If the operator has a new water absorption screen 1923 readily available, they simply need to disassemble the filter dryer 19 and replace the water absorption screen 1923. If the operator has not prepared a new water absorption filter 1923, it is necessary to first disconnect the pipe at the nitrogen outlet 35, and then turn on the servo motor 47. The servo motor 47 will drive the conical transmission wheel 46 to rotate through the conical driving wheel 48. The conical transmission wheel 46 will drive the water absorption filter 1923 to rotate rapidly, and some of the water absorbed on the water absorption filter 1923 will be thrown out through inertia to restore some of the water absorption performance of the water absorption filter 1923, providing time for the operator to purchase a new water absorption filter 1923.

[0042] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. An oil-free nitrogen and air dual-purpose booster, characterized by: The invention comprises a base (1), a supercharger body (2) is provided on the base (1), and a plurality of mutually connected compression devices are provided on the outside of the supercharger body (2) for sequentially starting and compressing the medium step by step, wherein the plurality of compression devices include a first-stage compression device (3), a second-stage compression device (4), a third-stage compression device (5) and a fourth-stage compression device (6), wherein the first-stage compression device (3) and the second-stage compression device (4) are symmetrically distributed on both sides of the bottom of the supercharger body (2), and the third-stage compression device (5) and the fourth-stage compression device (6) are symmetrically distributed on both sides of the top of the supercharger body (2), and the third-stage compression device (5) is located above the first-stage compression device (3), and the medium outlet of the first-stage compression device (3) and the medium inlet of the second-stage compression device (4) are connected through a first-stage connecting pipe (7), and a first-stage gas-liquid separation device (8) is provided in the middle of the first-stage connecting pipe (7), and the medium outlet of the second-stage compression device (4) and the medium inlet of the third-stage compression device (6) are connected. A secondary connecting pipe (9) is provided between the medium inlet of the device (5), a secondary gas-liquid separation device (10) is provided in the middle of the secondary connecting pipe (9), a tertiary connecting pipe (11) is provided between the medium outlet of the tertiary compression device (5) and the medium inlet of the quaternary compression device (6), a tertiary gas-liquid separation device (12) is provided in the middle of the tertiary connecting pipe (11), a medium discharge pipe (13) is provided at the medium outlet of the quaternary compression device (6), and the medium A four-stage gas-liquid separation device (14) is provided at the end of the discharge pipe (13); a medium transmission pipe (15) is provided at the medium outlet of the four-stage gas-liquid separation device (14); a three-way valve (16) is provided at the end of the medium transmission pipe (15); two medium outlets of the three-way valve (16) are respectively a compressed nitrogen outlet (17) and a compressed air outlet (18); a drying filter (19) is provided at the compressed nitrogen outlet (17) for drying the nitrogen compressed by the four stages.

2. The oil-free nitrogen and air dual-purpose booster according to claim 1, characterized in that: A first installation chamber (20) with an expanded opening is formed between the second-stage compression device (4) and the fourth-stage compression device (6), and the middle portion of the first-stage connecting pipe (7) is spirally arranged in the first installation chamber (20).

3. The oil-free nitrogen and air dual-purpose booster according to claim 1, characterized in that: A second installation chamber (21) with an expanded opening is formed between the first-stage compression device (3) and the third-stage compression device (5), and the middle portion of the second-stage connecting pipe (9) is spirally arranged in the second installation chamber (21).

4. The oil-free nitrogen and air dual-purpose booster according to claim 1, characterized in that: A third installation chamber (22) with an expanded opening is formed between the third-stage compression device (5) and the fourth-stage compression device (6), and the middle portion of the third-stage connecting pipe (11) is spirally arranged in the third installation chamber (22).

5. The oil-free nitrogen and air dual-purpose booster according to claim 1, characterized in that: A support frame (23) is provided at the upper end of the base (1), the support frame (23) is arranged side by side with the supercharger body (2), and the medium discharge pipe (13) is spirally arranged on the support frame (23).

6. The oil-free nitrogen and air dual-purpose booster according to claim 5, characterized in that: The support frame (23) includes a support disc (231) arranged on the supercharger body (2), and fixed support rods (232) uniformly arranged on the support disc (231) along the circumferential direction. Each of the fixed support rods (232) is provided with a fixed pressure plate (233). The fixed pressure plate (233) is provided with a plurality of limiting grooves (24) along the length direction on one side of the fixed support rod (232) for the medium discharge pipe (13) to pass through.

7. The oil-free nitrogen and air dual-purpose booster according to claim 6, characterized in that: The fixed pressure plate (233) is provided with a countersunk hole (25) between the two limiting slots (24), and a locking screw (26) is provided in each of the countersunk holes (25). The threaded section of the locking screw (26) passes through the countersunk hole (25) and is threadedly connected to the fixed support rod (232) to press and fix the fixed pressure plate (233) and the fixed support rod (232).

8. The oil-free nitrogen and air dual-purpose booster according to claim 6, characterized in that: The limiting groove (24) comprises a limiting portion (241) with a semicircular cross section and a connecting portion (242) with a rectangular cross section. The connecting portion (242) passes through the side wall of the fixed pressure plate (233) toward the fixed support rod (232). An elastic clamp (27) is provided in the limiting groove (24). The opening of the elastic clamp (27) faces one side of the fixed support rod (232) and is used to clamp and fix the medium discharge pipe (13). The curvature of the elastic clamp (27) is the same as that of the limiting portion (241).

9. The oil-free nitrogen and air dual-purpose booster according to claim 8, characterized in that: The two inner groove walls opposite to each other of the connecting portion (242) are provided with limiting sliding grooves (28), the extension direction of the limiting sliding grooves (28) is perpendicular to the extension direction of the limiting through groove (24), the two sides of the elastic clamp (27) are respectively slidably engaged in the limiting sliding grooves (28), the two inner groove walls opposite to each other of the connecting portion (242) are provided with guide blocks (29), the two guide blocks (29) are respectively located on one side of the two limiting sliding grooves (28) close to the fixed support rod (232), and the guide blocks (29) are respectively located on the one side of the two limiting sliding grooves (28) close to the fixed support rod (232). 9) is provided with a mounting through hole (30), and the two ends of the elastic clamp (27) pass through the mounting through holes (30) of the two guide blocks (29) respectively, so that the two ends of the elastic clamp (27) are in an open state, and the end of the guide block (29) away from the fixed support rod (232) is provided with a tapered guide hole (31), and the small end of the tapered guide hole (31) is connected to the mounting through hole (30) to guide the end of the elastic clamp (27) to extend into the mounting through hole (30).

10. The oil-free nitrogen and air dual-purpose booster according to claim 9, characterized in that: A locking through hole (32) is provided at a position opposite to the fixed pressure plate (233) and the limiting through slot (24). The locking through hole (32) is connected to the middle portion of the corresponding limiting through slot (24). A connecting rope (33) is passed through the locking through hole (32). One end of the connecting rope (33) is fastened and fixed to the elastic clamp (27), and the other end of the connecting rope (33) extends out of the locking through hole (32).

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