High-pressure gas injection compressor

Abstract

The invention discloses a high-pressure gas injection compressor which comprises a first-stage compression cylinder, a second-stage compression cylinder, a third-stage compression cylinder, a fourth-stage compression cylinder, a fifth-stage compression cylinder and a buffer tank set. The output end of the first-stage compression cylinder, the output end of the second-stage compression cylinder and the output end of the third-stage compression cylinder communicate with the input end of the fourth-stage compression cylinder correspondingly. The output end of the fourth-stage compression cylinder is communicated with the input end of the fifth-stage compression cylinder; the first-stage compression cylinder, the second-stage compression cylinder and the third-stage compression cylinder are all double-acting compression cylinders; the fourth-stage compression cylinder and the fifth-stage compression cylinder are range type compression cylinders; the buffer tank group comprises a plurality of air inlet buffer tanks and a plurality of air outlet buffer tanks; and the first-stage compression cylinder, the second-stage compression cylinder, the third-stage compression cylinder, the fourth-stage compression cylinder and the fifth-stage compression cylinder are respectively provided with at least one air inlet buffer tank and at least one air outlet buffer tank. The high-pressure gas injection compressor can solve the problem that an existing high-pressure gas injection compressor can generate large-amplitude gas flow pulsation under large working pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to a high-pressure gas injection compressor. Background Art

[0002] Drainage gas production is an effective method for solving gas well liquid accumulation and is also a common gas production process in water drive gas fields. There are equipment such as pipe strings, foam drainage, plunger gas lift, rod pumps, submersible electric pumps, sucker piston pumps, and jet pumps that can be used for drainage gas production; for ultra-deep wells, due to problems such as deep well depth, high well temperature, high gas-oil ratio, and high condensate oil content, in order to address the above problems, high-pressure gas is generally selected for drainage gas production. Therefore, there is a large demand for ultra-high-pressure compressors, especially for reciprocating compressors with a pressure above 70 MPa.

[0003] In the prior art, the 70 MPa injection reciprocating compressor is a key equipment for drainage gas production in ultra-deep well gas reservoirs. This type of compression equipment is currently widely applicable to drainage gas production in ultra-deep well gas reservoirs, mainly because the compression equipment operates stably and can implement safe production. However, during the operation of the high-pressure compressor unit, problems such as unit vibration and gas flow pulsation will occur, which may lead to accidents such as process pipeline cracking and pressure vessel damage. Moreover, the greater the working pressure of the compressor, the greater the gas flow pressure will inevitably be, resulting in an increase in the degree of vibration and gas flow pulsation. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-pressure gas injection compressor to solve the problem that the existing high-pressure gas injection compressor will generate a large amplitude of gas flow pulsation under a large working pressure.

[0005] The present invention is achieved by the following technical solutions:

[0006] A high-pressure gas injection compressor includes: a first-stage compression cylinder, a second-stage compression cylinder, a third-stage compression cylinder, a fourth-stage compression cylinder, and a fifth-stage compression cylinder. The output ends of the first-stage compression cylinder, the second-stage compression cylinder, and the third-stage compression cylinder are respectively communicated with the input end of the fourth-stage compression cylinder, and the output end of the fourth-stage compression cylinder is communicated with the input end of the fifth-stage compression cylinder; the first-stage compression cylinder, the second-stage compression cylinder, and the third-stage compression cylinder are all double-acting compression cylinders; the fourth-stage compression cylinder and the fifth-stage compression cylinder are both differential compression cylinders; a buffer tank group, which includes a plurality of intake buffer tanks and a plurality of exhaust buffer tanks, and at least one intake buffer tank and at least one exhaust buffer tank are respectively provided for the first-stage compression cylinder, the second-stage compression cylinder, the third-stage compression cylinder, the fourth-stage compression cylinder, and the fifth-stage compression cylinder.

[0007] Optionally, the fourth-stage compression cylinder includes multiple rows of first single cylinders, the fifth-stage compression cylinder includes multiple rows of second single cylinders, and the first single cylinders and the second single cylinders correspond to each other one by one and are communicated.

[0008] Optionally, the buffer tank group includes a first-stage intake buffer tank, a first-stage exhaust buffer tank, a second-stage intake buffer tank, a second-stage exhaust buffer tank, a third-stage intake buffer tank, a third-stage exhaust buffer tank, a fourth-stage intake buffer tank, a fourth-stage exhaust buffer tank, a fifth-stage intake buffer tank, and a plurality of fifth-stage exhaust buffer tanks. The fifth-stage exhaust buffer tanks correspond to the second single cylinders one by one. The first-stage intake buffer tank and the first-stage exhaust buffer tank are respectively communicated with the first-stage compression cylinder. The second-stage intake buffer tank and the second-stage exhaust buffer tank are respectively communicated with the second-stage compression cylinder. The third-stage intake buffer tank and the third-stage exhaust buffer tank are respectively communicated with the third-stage compression cylinder. The fourth-stage intake buffer tank and the fourth-stage exhaust buffer tank are respectively communicated with all the first single cylinders. The fifth-stage intake buffer tank is respectively communicated with all the second single cylinders, and each fifth-stage exhaust buffer tank is respectively communicated with the corresponding second single cylinder.

[0009] Optionally, a first-stage orifice plate is provided in the first-stage exhaust buffer tank, and the aperture of the first-stage orifice plate is 60 mm.

[0010] Optionally, a third-stage orifice plate is provided in the third-stage exhaust buffer tank, and the aperture of the third-stage orifice plate is 45 mm.

[0011] Optionally, fourth-stage orifice plates are provided in both the fourth-stage intake buffer tank and the fourth-stage exhaust buffer tank, and the aperture of each fourth-stage orifice plate is 35 mm.

[0012] Optionally, a fifth-stage orifice plate is provided in the fifth-stage intake buffer tank, and the aperture of the fifth-stage orifice plate is 35 mm.

[0013] Optionally, the first-stage compression cylinder, the second-stage compression cylinder, the third-stage compression cylinder, the first single cylinder, and the second single cylinder are all columnar. The first-stage compression cylinder, the second-stage compression cylinder, and the third-stage compression cylinder are arranged in parallel, and their axes are parallel to the axes of the first single cylinder and the second single cylinder to form a compression cylinder plane.

[0014] Optionally, both the intake buffer tank and the exhaust buffer tank are columnar; the first-stage intake buffer tank and the first-stage exhaust buffer tank are both perpendicular to the axis of the first-stage compression cylinder and are respectively located on both sides of the compression cylinder plane; the second-stage intake buffer tank is parallel to the axis of the second-stage compression cylinder, the second-stage exhaust buffer tank is perpendicular to the axis of the second-stage compression cylinder, and they are respectively located on both sides of the compression cylinder plane; the third-stage intake buffer tank and the third-stage exhaust buffer tank are both perpendicular to the axis of the third-stage compression cylinder and are respectively located on both sides of the compression cylinder plane; the fourth-stage intake buffer tank and the fourth-stage exhaust buffer tank are both perpendicular to the axis of the first single-cylinder and are respectively located on both sides of the compression cylinder plane; the fifth-stage intake buffer tank and the fifth-stage exhaust buffer tank are both perpendicular to the axis of the second single-cylinder and are respectively located on both sides of the compression cylinder plane, and all the fifth-stage exhaust buffer tanks are located on the same axis.

[0015] Optionally, the axes of both the intake buffer tank and the exhaust buffer tank are parallel to the compression cylinder plane.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] A high-pressure gas injection compressor provided by the present invention, by setting a first-stage compression cylinder, a second-stage compression cylinder and a third-stage compression cylinder, and defining the three as double-acting compression cylinders, the cylinder is divided into two chambers, namely a cylinder head end chamber and a crank end chamber by a piston. During the reciprocating motion of the piston, the cylinder head end chamber and the crank end chamber respectively perform compression and exhaust and expansion and suction, so as to form a working mode similar to that of a single-acting cylinder, which can effectively improve the exhaust volume of the cylinder and at the same time improve the working efficiency of the cylinder; by setting a fourth-stage compression cylinder and a fifth-stage compression cylinder, and defining the two as differential compression cylinders, the pressure difference of the packing seal can be effectively reduced; through the combined action of the above settings, the high-pressure gas injection compressor can reach and maintain a relatively high working pressure; by setting a buffer tank group and connecting it to the first-stage compression cylinder, the second-stage compression cylinder, the third-stage compression cylinder, the fourth-stage compression cylinder and the fifth-stage compression cylinder respectively, and using the buffer tank to control the air flow pulsation, so that the high-pressure gas injection compressor can effectively cope with the air flow pulsation when working under a relatively high working pressure; through the mutual cooperation of the above features, the high-pressure gas injection compressor can effectively solve the problem that the existing high-pressure gas injection compressor will generate a large amplitude of air flow pulsation under a relatively large working pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0019] Figure 1 is a schematic diagram of the high-pressure gas injection compressor provided by the embodiment of the present invention;

[0020] Figure 2 A top view of the high-pressure gas injection compressor provided by the embodiment of the present invention;

[0021] Figure 3 A side view of the high-pressure gas injection compressor provided by the embodiment of the present invention;

[0022] Figure 4 A front view of the high-pressure gas injection compressor provided by the embodiment of the present invention.

[0023] Reference numerals in the drawings and corresponding component names:

[0024] 10 - First-stage compression cylinder; 11 - First-stage intake buffer tank; 12 - First-stage exhaust buffer tank; 20 - Second-stage compression cylinder; 21 - Second-stage intake buffer tank; 22 - Second-stage exhaust buffer tank; 30 - Third-stage compression cylinder; 31 - Third-stage intake buffer tank; 32 - Third-stage exhaust buffer tank; 40 - Fourth-stage compression cylinder; 41 - Fourth-stage intake buffer tank; 42 - Fourth-stage exhaust buffer tank; 50 - Fifth-stage compression cylinder; 51 - Fifth-stage intake buffer tank; 52 - Fifth-stage exhaust buffer tank. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0026] Please refer to Figures 1 to 4 , the embodiment of the present invention provides a high-pressure gas injection compressor, including: a first-stage compression cylinder 10, a second-stage compression cylinder 20, a third-stage compression cylinder 30, a fourth-stage compression cylinder 40, and a fifth-stage compression cylinder 50. The output ends of the first-stage compression cylinder 10, the second-stage compression cylinder 20, and the third-stage compression cylinder 30 are respectively communicated with the input end of the fourth-stage compression cylinder 40, and the output end of the fourth-stage compression cylinder 40 is communicated with the input end of the fifth-stage compression cylinder 50; the first-stage compression cylinder 10, the second-stage compression cylinder 20, and the third-stage compression cylinder 30 are all double-acting compression cylinders; the fourth-stage compression cylinder 40 and the fifth-stage compression cylinder 50 are both differential compression cylinders; second, it includes a buffer tank group, and the buffer tank group includes a plurality of intake buffer tanks and a plurality of exhaust buffer tanks. The first-stage compression cylinder 10, the second-stage compression cylinder 20, the third-stage compression cylinder 30, the fourth-stage compression cylinder 40, and the fifth-stage compression cylinder 50 are respectively provided with at least one intake buffer tank and at least one exhaust buffer tank.

[0027] A high-pressure gas injection compressor provided by the present invention, by setting a first-stage compression cylinder 10, a second-stage compression cylinder 20 and a third-stage compression cylinder 30, and defining the three as double-acting compression cylinders, the cylinder is divided into two chambers, namely a cylinder head end chamber and a crank end chamber by a piston. During the reciprocating motion of the piston, the cylinder head end chamber and the crank end chamber respectively perform compression exhaust and expansion suction to form a working mode similar to that of a single-acting cylinder, which can effectively increase the exhaust volume of the cylinder and improve the working efficiency of the cylinder at the same time; by setting a fourth-stage compression cylinder 40 and a fifth-stage compression cylinder 50, and defining the two as differential compression cylinders, the pressure difference of the packing seal can be effectively reduced; through the combined action of the above settings, the high-pressure gas injection compressor can reach and maintain a relatively high working pressure; by setting a buffer tank group, which is respectively connected to the first-stage compression cylinder, the second-stage compression cylinder, the third-stage compression cylinder, the fourth-stage compression cylinder and the fifth-stage compression cylinder, and using the buffer tank to control the gas flow pulsation, so that the high-pressure gas injection compressor can effectively cope with the gas flow pulsation when working at a relatively high working pressure; through the mutual cooperation of the above features, the high-pressure gas injection compressor can effectively solve the problem that the existing high-pressure gas injection compressor will generate a large amplitude of gas flow pulsation under a large working pressure.

[0028] It should be noted that when the double-acting cylinder is in the two-way gas compression working condition, the pressure difference on both sides of the piston is the pressure difference between the intake pressure and the exhaust pressure. After the double-acting cylinder is divided into two chambers, namely a cylinder head end chamber and a crank end chamber by the piston, the two-way gas compression working condition is changed to a single-acting gas compression. At this time, the pressure difference on both sides of the piston is the pressure difference between the exhaust pressure and the atmospheric pressure. Therefore, the pressure difference on both sides of the piston is reduced, and in this way, the number of piston rings can be reduced.

[0029] It should be noted that because the cylinder head end chamber and the crank end chamber alternately perform compression exhaust and expansion suction, the direction of the resultant force of the gas forces on both sides of the piston will change, which is convenient for lubricating the crosshead pin, connecting rod bearing and crankshaft journal and is not easy to cause eccentric wear. This cannot be achieved in a pure single-acting cylinder because the direction of the resultant force of the gas forces in a pure single-acting cylinder remains unchanged all the time.

[0030] It should be noted that the reason why the differential compression cylinder can reduce the pressure difference of the packing seal is that when using the differential compression cylinder, the maximum pressure difference is the pressure difference between the exhaust pressure of the fourth-stage compression cylinder 40 and the atmospheric pressure; if a double-acting cylinder is selected, the maximum pressure difference will be in the fifth-stage compression cylinder 50. Therefore, the packing selected for the fifth-stage compression cylinder 50 needs to seal the maximum pressure difference, which is the pressure difference between the exhaust pressure of the fifth-stage compression cylinder 50 and the atmospheric pressure. Because the pressure is greater, more packing is required for sealing.

[0031] In order to further define the specific structures of the fourth-stage compression cylinder 40 and the fifth-stage compression cylinder 50, the fourth-stage compression cylinder 40 includes multiple rows of first single cylinders, the fifth-stage compression cylinder 50 includes multiple rows of second single cylinders, and the first single cylinders and the second single cylinders correspond to each other and are connected.

[0032] In this embodiment, the four-stage compression cylinder 40 includes three columns of first single cylinders, and the five-stage compression cylinder 50 includes three columns of second single cylinders. In other embodiments, the number of the first single cylinders and the second single cylinders can be changed according to requirements, but the numbers of both need to be the same.

[0033] For a specific explanation of the buffer tank group, the buffer tank group includes a first-stage intake buffer tank 11, a first-stage exhaust buffer tank 12, a second-stage intake buffer tank 21, a second-stage exhaust buffer tank 22, a third-stage intake buffer tank 31, a third-stage exhaust buffer tank 32, a fourth-stage intake buffer tank 41, a fourth-stage exhaust buffer tank 42, a fifth-stage intake buffer tank 51 and a plurality of fifth-stage exhaust buffer tanks 52. The fifth-stage exhaust buffer tanks 52 correspond to the second single cylinders one by one; the first-stage intake buffer tank 11 and the first-stage exhaust buffer tank 12 are respectively communicated with the first-stage compression cylinder 10; the second-stage intake buffer tank 21 and the second-stage exhaust buffer tank 22 are respectively communicated with the second-stage compression cylinder 20; the third-stage intake buffer tank 31 and the third-stage exhaust buffer tank 32 are respectively communicated with the third-stage compression cylinder 30; the fourth-stage intake buffer tank 41 and the fourth-stage exhaust buffer tank 42 are respectively communicated with all the first single cylinders; the fifth-stage intake buffer tank 51 is respectively communicated with all the second single cylinders, and each fifth-stage exhaust buffer tank 52 is respectively communicated with the corresponding second single cylinder.

[0034] The fourth-stage intake buffer tank 41 and the fourth-stage exhaust buffer tank 42 are connected to the first single cylinders in a parallel manner, which can utilize the phase difference of the air flow pulsation between the first single cylinders to achieve mutual cancellation between different buffer tanks, thereby controlling the air flow pulsation.

[0035] The fifth-stage intake buffer tank 51 is connected to the second single cylinders in a parallel manner. The same as the above function, it can further control the air flow pulsation. Since the fifth-stage exhaust buffer tank 52 has a high exhaust pressure and strong air flow pulsation, in order to better control the air flow pulsation and make the compressor operate smoothly, a plurality of fifth-stage exhaust buffer tanks 52 are provided, corresponding to the plurality of second single cylinders one by one.

[0036] Preferably, in order to further control the air flow pulsation, a first-stage orifice plate is provided in the first-stage exhaust buffer tank 12, and the aperture of the first-stage orifice plate is 60 mm; a third-stage orifice plate is provided in the third-stage exhaust buffer tank 32, and the aperture of the third-stage orifice plate is 45 mm; fourth-stage orifice plates are provided in both the fourth-stage intake buffer tank 41 and the fourth-stage exhaust buffer tank 42, and the aperture of the fourth-stage orifice plate is 35 mm; a fifth-stage orifice plate is provided in the fifth-stage intake buffer tank 51, and the aperture of the fifth-stage orifice plate is 35 mm.

[0037] In order to further reduce the mechanical vibration amplitude of the compressor, the first-stage compression cylinder 10, the second-stage compression cylinder 20, the third-stage compression cylinder 30, the first single cylinder and the second single cylinder are all columnar; the first-stage compression cylinder 10, the second-stage compression cylinder 20 and the third-stage compression cylinder 30 are arranged in parallel side by side, and their axes are parallel to the axes of the first single cylinder and the second single cylinder to form a compression cylinder plane.

[0038] In order to further optimize the structure of the entire compressor, the intake buffer tank and the exhaust buffer tank are both columnar; the first-stage intake buffer tank 11 and the first-stage exhaust buffer tank 12 are both perpendicular to the axis of the first-stage compression cylinder 10 and are respectively located on both sides of the compression cylinder plane; the second-stage intake buffer tank 21 is parallel to the axis of the second-stage compression cylinder 20, the second-stage exhaust buffer tank 22 is perpendicular to the axis of the second-stage compression cylinder 20 and are respectively located on both sides of the compression cylinder plane; the third-stage intake buffer tank 31 and the third-stage exhaust buffer tank 32 are both perpendicular to the axis of the third-stage compression cylinder 30 and are respectively located on both sides of the compression cylinder plane; the fourth-stage intake buffer tank 41 and the fourth-stage exhaust buffer tank 42 are both perpendicular to the axis of the first single cylinder and are respectively located on both sides of the compression cylinder plane; the fifth-stage intake buffer tank 51 and the fifth-stage exhaust buffer tank 52 are both perpendicular to the axis of the second single cylinder and are respectively located on both sides of the compression cylinder plane, and all the fifth-stage exhaust buffer tanks 52 are located on the same axis.

[0039] The set direction of the selected buffer tank is to set a suitable buffer tank volume, so that the turning of the air flow can be reduced; the current set direction of the buffer tank can achieve the purpose of controlling the air flow pulsation, and at the same time does not increase the length of the unit, and can also make full use of the space above the unit. After the air flow pulsation analysis, setting the second-stage intake buffer tank 21 vertically and setting the first-stage intake buffer tank 11 and the third-stage intake buffer tank 31 horizontally can achieve a suitable buffer tank volume and also have a suitable length-diameter ratio.

[0040] Preferably, the axes of the intake buffer tank and the exhaust buffer tank are both parallel to the compression cylinder plane.

[0041] The above specific embodiments have further elaborated on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-pressure gas injection compressor, characterized in that, it includes: a first-stage compression cylinder (10), a second-stage compression cylinder (20), a third-stage compression cylinder (30), a fourth-stage compression cylinder (40) and a fifth-stage compression cylinder (50). The output ends of the first-stage compression cylinder (10), the second-stage compression cylinder (20) and the third-stage compression cylinder (30) are respectively communicated with the input end of the fourth-stage compression cylinder (40), and the output end of the fourth-stage compression cylinder (40) is communicated with the input end of the fifth-stage compression cylinder (50). The first-stage compression cylinder (10), the second-stage compression cylinder (20) and the third-stage compression cylinder (30) are all double-acting compression cylinders. The fourth-stage compression cylinder (40) and the fifth-stage compression cylinder (50) are both differential compression cylinders; a buffer tank group, which includes a plurality of inlet buffer tanks and a plurality of outlet buffer tanks. At least one inlet buffer tank and at least one outlet buffer tank are respectively provided for the first-stage compression cylinder (10), the second-stage compression cylinder (20), the third-stage compression cylinder (30), the fourth-stage compression cylinder (40) and the fifth-stage compression cylinder (50).

2. The high-pressure gas injection compressor according to claim 1, characterized in that, the fourth-stage compression cylinder (40) includes multiple columns of first single cylinders, the fifth-stage compression cylinder (50) includes multiple columns of second single cylinders, and the first single cylinders and the second single cylinders correspond to each other and are communicated.

3. The high-pressure gas injection compressor according to claim 2, characterized in that, the buffer tank group includes a first-stage inlet buffer tank (11), a first-stage outlet buffer tank (12), a second-stage inlet buffer tank (21), a second-stage outlet buffer tank (22), a third-stage inlet buffer tank (31), a third-stage outlet buffer tank (32), a fourth-stage inlet buffer tank (41), a fourth-stage outlet buffer tank (42), a fifth-stage inlet buffer tank (51) and a plurality of fifth-stage outlet buffer tanks (52). The fifth-stage outlet buffer tanks (52) correspond to the second single cylinders one by one; the first-stage inlet buffer tank (11) and the first-stage outlet buffer tank (12) are respectively communicated with the first-stage compression cylinder (10); the second-stage inlet buffer tank (21) and the second-stage outlet buffer tank (22) are respectively communicated with the second-stage compression cylinder (20); the third-stage inlet buffer tank (31) and the third-stage outlet buffer tank (32) are respectively communicated with the third-stage compression cylinder (30); the fourth-stage inlet buffer tank (41) and the fourth-stage outlet buffer tank (42) are respectively communicated with all the first single cylinders; the fifth-stage inlet buffer tank (51) is respectively communicated with all the second single cylinders, and each fifth-stage outlet buffer tank (52) is respectively communicated with the corresponding second single cylinder.

4. The high-pressure gas injection compressor according to claim 3, characterized in that, a first-stage orifice plate is provided in the first-stage outlet buffer tank (12), and the aperture of the first-stage orifice plate is 60 mm.

5. The high-pressure gas injection compressor according to claim 3, characterized in that, a third-stage orifice plate is provided in the third-stage outlet buffer tank (32), and the aperture of the third-stage orifice plate is 45 mm.

6. The high-pressure gas injection compressor according to claim 3, It is characterized in that a four - stage orifice plate is provided in each of the four - stage inlet buffer tank (41) and the four - stage outlet buffer tank (42), and the aperture of the four - stage orifice plate is 35 mm.

7. The high - pressure gas injection compressor according to claim 3, It is characterized in that a five - stage orifice plate is provided in the five - stage inlet buffer tank (51), and the aperture of the five - stage orifice plate is 35 mm.

8. The high - pressure gas injection compressor according to any one of claims 3 - 7, It is characterized in that the first - stage compression cylinder (10), the second - stage compression cylinder (20), the third - stage compression cylinder (30), the first single - cylinder and the second single - cylinder are all columnar; the first - stage compression cylinder (10), the second - stage compression cylinder (20) and the third - stage compression cylinder (30) are arranged in parallel and side - by - side, and their axes are parallel to the axes of the first single - cylinder and the second single - cylinder to form a compression cylinder plane.

9. The high - pressure gas injection compressor according to claim 8, It is characterized in that the inlet buffer tank and the outlet buffer tank are both columnar; the first - stage inlet buffer tank (11) and the first - stage outlet buffer tank (12) are both perpendicular to the axis of the first - stage compression cylinder (10) and are respectively located on both sides of the compression cylinder plane; the second - stage inlet buffer tank (21) is parallel to the axis of the second - stage compression cylinder (20), the second - stage outlet buffer tank (22) is perpendicular to the axis of the second - stage compression cylinder (20), and they are respectively located on both sides of the compression cylinder plane; the third - stage inlet buffer tank (31) and the third - stage outlet buffer tank (32) are both perpendicular to the axis of the third - stage compression cylinder (30) and are respectively located on both sides of the compression cylinder plane; the fourth - stage inlet buffer tank (41) and the fourth - stage outlet buffer tank (42) are both perpendicular to the axis of the first single - cylinder and are respectively located on both sides of the compression cylinder plane; the fifth - stage inlet buffer tank (51) and the fifth - stage outlet buffer tank (52) are both perpendicular to the axis of the second single - cylinder and are respectively located on both sides of the compression cylinder plane, and all the fifth - stage outlet buffer tanks (52) are located on the same axis.

10. The high - pressure gas injection compressor according to claim 9, It is characterized in that the axes of the inlet buffer tank and the outlet buffer tank are both parallel to the compression cylinder plane.

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