CN111765063A

CN111765063A - In-line compact gas booster

Info

Publication number: CN111765063A
Application number: CN202010912483.8A
Authority: CN
Inventors: 张兴荣
Original assignee: Shandong Prestige Union Petroleum Machinery Co ltd
Current assignee: Shandong Prestige Union Petroleum Machinery Co ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2020-10-13
Anticipated expiration: 2040-09-03
Also published as: CN111765063B

Abstract

The invention relates to an in-line compact gas booster, which comprises a machine body, a machine cover, a crankshaft, connecting rods, a push cylinder and a one-way valve, wherein the machine cover is fixedly connected on the machine body, the lower part of the machine body is provided with a shaft groove, the upper part of the machine body is provided with a columnar gas passage, the crankshaft is rotationally connected in the shaft groove, one ends of a plurality of connecting rods are hinged on the crankshaft at intervals, the other ends of the connecting rods are hinged with the push cylinder, the push cylinder is slidably connected in the gas passage, the machine cover is respectively provided with a gas inlet hole, a gas adding hole, the invention is characterized in that the air inlet and the air outlet are respectively arranged at the left side and the right side of the cover, the air outlet end of the air inlet extends into the two air passages, the two ends of the air filling hole extend into the non-adjacent air passages, the two ends of the air delivery hole extend into the adjacent air passages, and the one-way valve and the concentric valve are fixedly connected with the air inlet, the air filling hole and the air outlet end of the air delivery hole. The special lever cooling liquid is introduced into the cavity.

Description

In-line compact gas booster

Technical Field

The invention relates to the technical field of large-scale pneumatic equipment, in particular to an in-line compact gas booster.

Background

Gas pressurization machinery is a critical device in pneumatic tool applications. In a pneumatic system, a large amount of high-pressure gas is often needed in some occasions, for example, gas lift operation, air drilling, nitrogen displacement purging and the like in oil field construction all use high-pressure and large-displacement gas. Because the construction places are all in the field and the working places are not fixed, the mobility is frequent; conventional gas supercharging devices such as a horizontal symmetrical gas supercharger and a W-type gas supercharger all have the disadvantages of large volume and easy high temperature, and cannot meet more construction requirements.

Therefore, in response to the above deficiencies, it is desirable to provide an in-line compact gas booster.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problems that the existing gas booster is large in size and easy to be heated.

(II) technical scheme

In order to solve the technical problem, the invention provides an in-line compact gas booster which comprises a machine body, a machine cover, a crankshaft, connecting rods, a push cylinder and a one-way valve, wherein the machine cover is fixedly connected to the machine body, a shaft groove is formed in the lower portion of the machine body, a columnar gas passage is formed in the upper portion of the machine body, the crankshaft is rotatably connected into the shaft groove, one ends of the connecting rods are hinged to the crankshaft at intervals, the other ends of the connecting rods are hinged to the push cylinder, the push cylinder is connected into the gas passage in a sliding mode, a gas inlet hole, a gas filling hole, a gas delivery hole and a gas outlet hole are formed in the machine cover and located above the gas passage respectively, the gas inlet hole and the gas outlet hole are formed in the left side and the right side of the machine cover respectively, the gas outlet ends of the gas inlet hole and the gas outlet hole respectively extend into.

By adopting the technical scheme, the in-line cylinder body is utilized to gradually pressurize, so that the output gas pressure can meet the requirement, the structural characteristics of the in-line engine body can be utilized to reduce the distance between the pushing cylinders, the volume of the gas supercharger is reduced on the premise of not changing the output power, and the transportation is facilitated. Utilize multiple gas pocket to establish ties and parallelly connected respectively with each air flue simultaneously, when guaranteeing that gas pressure can strengthen, reduce mechanical vibration to the organism and to the damage of bent axle, improve equipment's life accomplishes two birds with one stone.

As a further illustration of the invention, it is preferred that the number of air passages is six, that the air passage axes lie in the same plane and that the air passage axes are parallel to each other.

Through adopting above-mentioned technical scheme, adopt six stroke air flues and push away the jar, utilize the symmetry formula motion to offset the vibration to the organism when pushing away the jar motion each other, reduce the mechanical vibration range and the frequency of equipment by a wide margin, make the organism difficult to produce resonance and the damaged problem appears, improve the life of organism.

As a further explanation of the present invention, preferably, one side of the cover is provided with two air inlets, air inlet ends of the air inlets extend out of the cover, and air outlet ends of the air inlets extend into the adjacent first air passage and the second air passage respectively.

Through adopting above-mentioned technical scheme, increase the air input in the air flue, compare only an air flue and admit air, can increase compression efficiency by a wide margin, combine the check valve of high output, make the gas pressure of equipment output bigger.

As a further explanation of the present invention, preferably, the air inlet end of the air filling hole extends into the first air passage, the air outlet end of the air filling hole extends into a third air passage adjacent to the second air passage, the air inlet end of the first air delivery hole is communicated with the second air passage, and the air outlet end of the first air delivery hole is communicated with the third air passage; the cylinder pushing stroke in the first air passage is larger than that in the third air passage.

Through adopting above-mentioned technical scheme, when pushing away the jar simultaneously to filling the gas hole department motion in first air flue and the third air flue, the air pressure in the first air flue is greater than the air pressure in the third air flue, and the low-power check valve on the cooperation third air flue gas transmission hole makes even gas in the first air flue pushes away under the jar compression form in the third air flue, and the gas transmission hole of still accessible third air flue gets into the fourth air flue for gas volume greatly increased in the fourth air flue realizes the effect that improves the pressure boost efficiency in the short time.

As a further explanation of the present invention, preferably, the check valve includes a valve body and a top plate, the valve body is fixedly connected to the cover, the top of the top plate is fixedly connected to a limit post, two sides of the limit post are fixedly connected to a spring, and the bottom of the spring is fixedly connected to the valve body.

By adopting the technical scheme, the gas flows from the valve body to the top disc to push the top disc to flow into the gas channel, and the spring is compressed at the moment; when the pushing cylinder of the same air passage moves towards the one-way valve, the spring contracts and is matched with the air pushing in the air passage to push the top disc to reset, and the top disc is tightly matched with the valve body to effectively prevent the air from flowing back to the previous air passage, so that the one-way flow of the air is realized.

As a further explanation of the present invention, preferably, the top disk is a hemisphere, the outer diameter of the top disk is equal to the inner diameter of the valve body, and the outer diameter of the limiting column is smaller than the inner diameter of the valve body.

Through adopting above-mentioned technical scheme, can make gaseous only need back-up the less distance of top dish, can follow the top dish clearance all around and flow out the valve body, avoid under high-pressure environment the spring compressed excessively and become invalid, improve the life of check valve.

As a further explanation of the present invention, preferably, the inner wall of the valve body is fixedly connected with a support, the spring is fixedly connected with the support, the support is fixedly connected with a guide post, and the guide post is slidably connected with the limit post.

Through adopting above-mentioned technical scheme, set up the direction of motion of guide post in order to stabilize the top dish, and then avoid the spring compression direction skew, further ensure the long-term effect of spring.

As a further illustration of the invention, it is preferred that the spring stiffness in the different one-way valves is different, wherein the spring stiffness in the one-way valve is higher the closer to the outlet opening.

By adopting the technical scheme, the pressure of the gas flowing through the one-way valve can be pushed out of the ejection disc only by increasing gradually, so that the effect of increasing the atmospheric pressure gradually is realized.

As a further explanation of the present invention, preferably, the valve body is fixedly connected with supporting rods at two sides of the limiting column, and the distance between the supporting rods is smaller than the distance between the springs.

Through adopting above-mentioned technical scheme, set up the removal of the spacing post of branch restriction, avoid spacing post excessive compression spring to make the spring inefficacy under highly-compressed air's extrusion, avoid appearing simultaneously because of the cracked problem of spring and guide post makes the problem that take over and spacing post dropped in the air flue, the guarantee pushes away jar and check valve homoenergetic and normally works.

As a further explanation of the present invention, it is preferable that the strut has a trapezoidal cross section, and the end of the strut having a smaller outer diameter is directed to the inlet end of the valve body.

Through adopting above-mentioned technical scheme, with gas pressure direction to the branch outside, avoid branch pressurized deformation and influence the protection to spring and spacing post.

(III) advantageous effects

The technical scheme of the invention has the following advantages:

the invention increases the supercharging efficiency by using a plurality of groups of pushing cylinders to pressurize step by step, and simultaneously adopts in-line distribution of the plurality of groups of pushing cylinders, compared with the existing gas supercharger with the same cylinder number, the volume is reduced by about 45 percent, the supercharging efficiency is basically the same, and the machine body can output larger air pressure by replacing the one-way valve and inputting the power of the motor, thereby improving the practicability of the supercharger.

Drawings

FIG. 1 is a partial cross-sectional view of the supercharger of the present invention;

FIG. 2 is a bottom view of the check valve of the present invention;

FIG. 3 is a top view of the check valve of the present invention;

FIG. 4 is a partial cross-sectional view of the check valve of the present invention;

fig. 5 is an enlarged view of a in fig. 4.

In the figure: 1. a body; 11. a shaft groove; 12. an airway; 13. a peripheral housing; 2. a machine cover; 21. an air inlet; 22. air holes are added; 23. a gas transmission hole; 24. an air outlet; 3. a crankshaft; 31. an eccentric wheel; 4. a connecting rod; 5. pushing the cylinder; 51. a seal ring; 6. a one-way valve; 61. a valve body; 62. a top tray; 63. a limiting column; 64. a spring; 65. a support platform; 66. a guide post; 67. a boss; 68. a strut; 69. a flange plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The utility model provides an in-line compact gaseous booster compressor, as shown in figure 1, including organism 1, cover 2, bent axle 3, connecting rod 4, push away jar 5 and check valve 6, cover 2 links firmly on organism 1, the axial trough 11 has been seted up to organism 1 lower part, columnar air flue 12 has been seted up on 1 upper portion of organism, 3 rotations of bent axle are connected in axial trough 11, connecting rod 4 one end interval articulates on bent axle 3, the connecting rod 4 other end is articulated with push away jar 5, push away jar 5 sliding connection in air flue 12, cover 2 is located air flue 12 top and has seted up inlet port 21 respectively, gas filling hole 22, gas transmission hole 23 and venthole 24, check valve 6 links firmly at the inlet port 21, the end of giving vent to anger of gas filling hole 22 and gas transmission hole 23.

As shown in fig. 1, the machine body 1 is a square steel shell, the shaft groove 11 and the air passages 12 are both cylindrical grooves, the axial direction of the shaft groove 11 is horizontal, the axial direction of the air passages 12 is vertical, the number of the air passages 12 is six, the axial lines of the air passages 12 are located on the same plane, and the axial lines of the air passages 12 are parallel to each other, so that the six push cylinders 5 are distributed in an in-line manner. One end of the crankshaft 3 extends out of the machine body 1 and is rotationally connected with an input motor to drive the crankshaft 3 to rotate, wherein the input motor is selected to ensure that the power of the input motor is greater than the output power of the cylinder pushing device with the maximum required output pressure; the crankshaft 3 is located and is linked firmly sectorial eccentric wheel 31 in connecting rod 4 both sides, and eccentric wheel 31 external diameter slightly is less than the axle slot 11 external diameter, is filled with lubricating oil in the axle slot 11, sets up eccentric wheel 31 available centrifugal action and assists and to pull the thrust cylinder 5 to the axle slot 11 to reduce the burden of input motor, eccentric wheel 31 still can be raised the lubricating oil in the axle slot 11 simultaneously and sputter other parts in the organism, with other moving parts of lubricated organism inside.

As shown in fig. 1, by adopting the six-stroke air passage 12 and the push cylinder 5, the vibration to the machine body 1 when the push cylinder 5 moves is mutually offset by using the 3 × 3 symmetric motion, the mechanical vibration amplitude and frequency of the equipment are greatly reduced, the machine body 1 is not easy to generate resonance and the problem of damage is solved, and the service life of the machine body is prolonged.

As shown in fig. 1, the cover 2 is a square steel cover plate, the cover 2 is fixedly connected with the machine body 1 through a bolt, and a sealing gasket is further attached between the cover 2 and the machine body 1 to avoid gas leakage. The air inlet hole 21, the air filling hole 22, the air delivery hole 23 and the air outlet hole 24 are all cylindrical holes, and the air inlet hole 21, the air filling hole 22, the air delivery hole 23 and the air outlet hole 24 are formed together with the cover 2 through casting processes such as pouring and injection, so that the structural strength of the cover 2 is prevented from being influenced by later-stage drilling. Wherein the air inlet 21 and the air outlet 24 are respectively arranged at the left and right sides of the cover 2, the air outlet end of the air inlet 21 respectively extends into the first air passage 12 and the second air passage 12 (for clearly expressing the air flow direction, in particular to the first air passage 12, the second air passage 12, the third air passage 12, the fourth air passage 12, the fifth air passage 12 and the sixth air passage 12 along the air passages 12 from the air inlet 21 to the air outlet 24), the two ends of the air filling hole 22 respectively extend into the first air passage 12 and the third air passage 12, the two ends of the four air conveying holes 23 respectively extend into the second air passage 12 and the third air passage 12, the third air passage 12 and the fourth air passage 12, the fourth air passage 12 and the fifth air passage 12, the fifth air passage 12 and the sixth air passage 12 are connected in parallel, and the third air passage 12 and the sixth air passage 12 are connected in series.

As shown in fig. 1, the stroke of the cylinder 5 in the first air passage 12 is greater than the stroke of the cylinder 5 in the third air passage 12, generally, the stroke of the first air passage 12 should be greater than the stroke of the third air passage 12 by about 10 to 20mm, specifically, the stroke of the sixth air passage 12 is the same as the stroke of the first air passage 12, when the cylinder 5 in the first air passage 12 and the third air passage 12 moves to the gas filling hole 22 at the same time, the air pressure in the first air passage 12 is greater than the air pressure in the third air passage 12 because the amount of the compressed air in the first air passage 12 is greater than that in the third air passage 12, and the air pressure in the first air passage 12 is greater than the air pressure in the third air passage 12 by cooperating with the low-power check valve 6 on the air vent 23 of the third air passage 12, so that the air in the first air passage 12 can still enter the fourth air passage 12 through the air vent 23 of the third air passage 12 even in the compressed state, the amount of gas in the unit volume in the fourth air passage 12 is greatly increased, and the effect of improving the supercharging efficiency in a short time is realized. Simultaneously, the stroke amounts of the first air passage 12 and the sixth air passage 12 are reasonably increased, so that the machine body can keep dynamic balance, the unidirectional flow of gas can be ensured, and the vibration and the noise of the machine body 1 are reduced to the maximum extent.

As shown in fig. 1, the aperture of the air passage 12 and the aperture of each pore vary according to actual needs, and the larger the aperture is, the larger the amount of exhaust gas per unit time is; the relationship between the air passage 12 and the aperture of the air hole should satisfy:

wherein the content of the first and second substances,

d is the aperture of the air hole;

l is the required displacement;

p is the required output air pressure;

d is the diameter of the airway 12.

For air drilling, the required displacement is about 200m³The required air pressure is 2MPa, the existing diesel engine shell is selected as the engine body 1, the caliber of a piston of the engine body 1 is about 185mm, the external shell 13 is additionally arranged on the engine body 1, an air passage 12 is formed in the external shell 13, the outer diameter of the air passage 12 can also be 185mm, and only the external shell 13 and the engine cover 2 with the air hole with the caliber of about 18mm need to be cast in the later stage, so that the requirement of air drilling can be met, the engine body 1 does not need to be additionally manufactured, and the production cost is reduced. And through the formula, the aperture of the air hole is directly obtained according to the actual requirement, multiple manufacturing test verification is not needed, and the requirement of most pneumatic engineering can be met by avoiding resource waste. Meanwhile, the external shell 13 is additionally arranged on the existing diesel engine shell, the outer diameters of the air passage 12 and the push cylinder 5 can be changed according to the air supply quantity, and the supercharger can be suitable for working environments with different output air pressure types by matching with a corresponding output power motor.

Through adopting the gas booster compressor of inline, utilize the inline cylinder body to step-by-step pressure boost, can not only make the gas pressure of output reach the requirement, can also utilize the structural feature of inline engine body 1, reduce the interval between each pushing away the jar 5, realize not changing under the prerequisite of output, reduce the volume size of gas booster compressor, the transportation of being convenient for. Utilize multiple gas pocket to establish ties and parallelly connected respectively with each air flue 12 simultaneously, increase the air input in the air flue 12, compare only one air flue 12 and admit air, can increase compression efficiency by a wide margin, combine high output's check valve 6, make the gas pressure of equipment output bigger, when guaranteeing that gas pressure can strengthen, reduce mechanical vibration to organism 1 and to the damage to bent axle 3, improve equipment's life, kill two birds with one stone.

Combine fig. 2, fig. 3, check valve 6 includes valve body 61 and top dish 62, and valve body 61 screw thread links firmly on cover 2, and valve body 61 is the pipe form, and the valve body 61 periphery has linked firmly ring flange 69, and the accessible butt is at the removal of the mode restriction check valve 6 of cover 2, avoids the problem that check valve 6 was impressed in the gas pocket completely and can't be changed under high-pressure environment. The top disc 62 is a hemisphere, the outer diameter of the top disc 62 is equal to the inner diameter of the valve body 61, the middle of the arc surface at the top of the top disc 62 is fixedly connected with a limiting column 63, and the outer diameter of the limiting column 63 is smaller than the inner diameter of the valve body 61. The two sides of the limiting column 63 are fixedly connected with bosses 67, the lower portion of each boss 67 is fixedly connected with a spring 64, the valve body 61 is positioned on the inner wall above the top plate 62 and fixedly connected with a support table 65, the bottom of each spring 64 is fixedly connected with the support table 65, and the length direction of each spring 64 is the same as that of the limiting column 63.

Referring to fig. 2 and 3, the gas flows from the top of the valve body 61 to the top plate 62, and the gas pushes the top plate 62 away to flow into the gas duct 12, and the spring 64 is compressed; wherein the arc surface of top dish 62 leads gas to top dish 62 all around, and gas only needs the less distance of top dish 62 of liftout at this moment, can follow top dish 62 clearance all around and flow out valve body 61, avoids under high pressure environment spring 64 compressed excessively and became invalid, improves check valve 6's life. When the push cylinder 5 of the same air passage 12 moves towards the one-way valve 6, the spring 64 contracts and is matched with the air pushing in the air passage 12 to reset the top disc 62, and the top disc 62 is tightly matched with the valve body 61 to effectively prevent the air from flowing back to the previous air passage 12, so that the one-way flow of the air is realized.

With reference to fig. 1 and 3, the hardness of the spring 64 in different check valves 6 is different, wherein the higher the hardness of the spring 64 in the check valve 6 closer to the air outlet 24, the weaker the elasticity of the spring 64 is, so that the gas in the air duct 12 must be compressed to a certain pressure to push the top disc 62 open, thereby achieving the effect of gradually increasing the atmospheric pressure. The supporting table 65 is fixedly connected with a guide post 66, the guide post 66 is connected in the boss 67 in a sliding mode, and the guide post 66 is arranged to stabilize the moving direction of the top disc 62, so that the compression direction deviation of the spring 64 is avoided, and the long-acting performance of the spring 64 is further guaranteed.

With reference to fig. 4 and 5, the valve body 61 is fixedly connected with support rods 68 at two sides of the limiting column 63, the cross sections of the support rods 68 are trapezoidal, and the end of the support rod 68 with the smaller outer diameter points to the air inlet end of the valve body 61; the branch 68 interval is less than the spring 64 interval, so that branch 68 is located under the boss 67, branch 68 is less than the compression stroke of spring 64 with the biggest interval of boss 67 simultaneously, set up the removal of branch 68 through the mode restriction spacing post 63 with the boss 67 butt, avoid spacing post 63 excessive compression spring 64 to make spring 64 inefficacy under high-pressure air's extrusion, avoid appearing making the problem that head plate 62 and spacing post 63 drop to air flue 12 because of spring 64 and the cracked problem of guide post 66 simultaneously, guarantee push cylinder 5 and check valve 6 homoenergetic normal work. And the support rod 68 is arranged in a triangular prism shape, so that the gas pressure can be guided to the outer side of the support rod 68, and the influence of the pressure deformation of the support rod 68 on the protection effect of the spring 64 and the limiting column 63 is avoided.

When the engine body 1 adopts the existing diesel engine shell, the air suction type combined cooler with the diesel engine is arranged outside the engine body 1, a cooling liquid channel is additionally arranged on the cover to be communicated with the cooler, and the cooling system of the original engine is utilized to cool the push cylinder 5, the cover 2 and the check valve 6, so that the over-temperature of the supercharger is avoided. And meanwhile, a lubricating oil channel is additionally arranged to be communicated with an original lubricating system of the diesel engine, so that the function of lubricating the push cylinder is realized. A safety valve and a temperature detection device can be additionally arranged on the cover 2 opposite to each air passage 12 so as to monitor the running condition of the equipment in real time, and the equipment can react in time when the condition appears, thereby protecting the safety of the equipment. Simultaneously install the rubber pad additional between organism 1 and vertical support to install the box that has the cooling water that flows additional between rubber pad and organism 1, can not only cushion the vibration of organism operation, can also follow the external cooling for organism 1, improve equipment security. And a protective cover with a vacuum inner wall can be arranged on the outer cover of the gas booster, so that the mechanical noise is effectively reduced. Meanwhile, concentric valves can be additionally arranged at the air inlet 21, the air adding hole 22 and the air delivery hole 23, and the effect that when the first air passage 12, the third air passage 12 and the fifth air passage 12 are opened, the second air passage 12, the fourth air passage 12 and the sixth air passage 12 are closed by matching with the one-way valve 6 is further avoided, the gas in the second air passage 12, the fourth air passage 12 and the sixth air passage 12 is further prevented from being sucked into the first air passage 12, the third air passage 12 and the fifth air passage 12, and the gas flow direction is accurately controlled.

The gas supercharger is applied to the air drilling engineering, the body 1 adopts the shell of the existing diesel engine, 2-3 gas superchargers can be transported by one transport vehicle, and the lower rotating speed of 5m/s is combined, so that the gas supercharger easily meets the requirements of 2MPa and 200m³The output volume of/min compares original horizontal symmetry formula gas booster compressor's bulky and high rotational speed, and the gas booster compressor that this application provided not only atmospheric pressure output strengthens, occupies small moreover, the transportation of being convenient for, and manufacturing cost also reduces to some extent moreover, and recycles old and useless shell once more, has higher feature of environmental protection.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An in-line compact gas booster characterized by: comprises a machine body (1), a machine cover (2), a crankshaft (3), connecting rods (4), a thrust cylinder (5) and a one-way valve (6), wherein the machine cover (2) is fixedly connected on the machine body (1), a shaft groove (11) is formed in the lower part of the machine body (1), a columnar air passage (12) is formed in the upper part of the machine body (1), the crankshaft (3) is rotatably connected in the shaft groove (11), one ends of a plurality of connecting rods (4) are hinged on the crankshaft (3) at intervals, the other end of each connecting rod (4) is hinged with the thrust cylinder (5), the thrust cylinder (5) is slidably connected in the air passage (12), an air inlet hole (21), an air filling hole (22), an air conveying hole (23) and an air outlet hole (24) are respectively formed in the upper part of the machine cover (2) and positioned above the air passage (12), the air inlet hole (21) and the air outlet hole (24) are respectively formed in the, two ends of the air adding hole (22) extend into the non-adjacent air passages (12) respectively, two ends of the air delivery hole (23) extend into the adjacent air passages (12), and the one-way valve (6) is fixedly connected with the air outlet ends of the air inlet hole (21), the air adding hole (22) and the air delivery hole (23).

2. An in-line compact gas booster as claimed in claim 1, characterized in that: the number of the air passages (12) is six, the axes of the air passages (12) are positioned on the same plane, and the axes of the air passages (12) are parallel to each other.

3. An in-line compact gas booster as claimed in claim 2, characterized in that: two air inlets (21) are formed in one side of the machine cover (2), the air inlet ends of the air inlets (21) extend out of the machine cover (2), and the air outlet ends of the air inlets (21) extend into the adjacent first air passage (12) and the second air passage (12) respectively.

4. An in-line compact gas booster as claimed in claim 3, characterized in that: the air inlet end of the air inlet hole (22) extends into the first air passage (12), the air outlet end of the air inlet hole (22) extends into a third air passage (12) adjacent to the second air passage (12), the air inlet end of the first air delivery hole (23) is communicated with the second air passage (12), and the air outlet end of the first air delivery hole (23) is communicated with the third air passage (12); the stroke of the cylinder (5) in the first air passage (12) is larger than that in the third air passage (12).

5. An in-line compact gas booster as claimed in claim 1, characterized in that: the check valve (6) comprises a valve body (61) and a top disc (62), the valve body (61) is fixedly connected to the cover (2), a limiting column (63) is fixedly connected to the top of the top disc (62), springs (64) are fixedly connected to two sides of the limiting column (63), and the bottoms of the springs (64) are fixedly connected with the valve body (61).

6. An in-line compact gas booster as claimed in claim 5, characterized in that: the top disc (62) is a hemisphere, the outer diameter of the top disc (62) is equal to the inner diameter of the valve body (61), and the outer diameter of the limiting column (63) is smaller than the inner diameter of the valve body (61).

7. An in-line compact gas booster as claimed in claim 6, characterized in that: the inner wall of the valve body (61) is fixedly connected with a support table (65), the spring (64) is fixedly connected with the support table (65), the support table (65) is fixedly connected with a guide column (66), and the guide column (66) is connected to the limiting column (63) in a sliding mode.

8. An in-line compact gas booster as claimed in claim 5, characterized in that: the springs (64) in different one-way valves (6) have different hardness, wherein the springs (64) in the one-way valves (6) which are closer to the air outlet hole have higher hardness.

9. An in-line compact gas booster as claimed in claim 5, characterized in that: supporting rods (68) are fixedly connected to two sides of the limiting column (63) in the valve body (61), and the distance between the supporting rods (68) is smaller than that between the springs (64).

10. An in-line compact gas booster as claimed in claim 9, characterized in that: the section of the support rod (68) is trapezoidal, and one end of the support rod (68) with small outer diameter points to the air inlet end of the valve body (61).