Oil-gas mixing device for piston type oil-gas mixing and conveying machine

Abstract

The invention discloses an oil-gas mixing device for a piston type oil-gas mixing conveyor, the oil-gas mixing device is composed of an oil-gas inlet part, an oil-gas mixing part and an oil-gas uniform mixing part which are connected in sequence, the oil-gas inlet part is composed of a regular tee joint and a reducing connecting pipe, the oil-gas mixing part is composed of a shoulder ring flange and a sleeve, and the oil-gas uniform mixing part is composed of an oil-gas uniform mixing part. The oil-gas uniform mixing component is composed of an inner sleeve hole pipe, an outer sleeve hole pipe and an outer sleeve hole pipe from inside to outside, small holes are evenly formed in the surfaces of the outer sleeve hole pipe and the inner sleeve hole pipe, and an outlet connecting pipe communicated with the bottom of the inner sleeve hole pipe is arranged at the bottom of the outer pipe. Compared with the prior art, oil, gas and liquid in oil gas at a wellhead of an oil field can be fully and completely mixed, it is ensured that the piston type oil-gas mixing conveying machine cannot generate liquid impact during pressurization in the cylinder body, and the oil-gas mixing device is suitable for various piston type oil-gas mixing conveying machines, simple in structure, easy to manufacture, free of special requirements for materials and low in cost. The manufacturing cost is low.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas compression and gathering, and in particular to an oil and gas mixing device for a piston type oil and gas mixing machine. Background Art

[0002] There are two methods for gathering and transporting oil and associated gas in my country: separating the oil and gas and transporting them separately; and gathering and transporting the oil and gas together to a processing station, where they are separated and then transported again. The former is suitable for large oil fields, while the latter is suitable for desert oil fields, marginal and satellite oil fields, and for long-distance pipeline transportation. Currently, a wide range of mixed-transport pumps for medium- and low-pressure exhaust conditions are in use, including screw pumps, liquid ring pumps, centrifugal pumps, vortex pumps, and swing rotor mixed-transport pumps. Although these technologies are relatively mature, their practical application is to transport mainly oil with a small amount of associated gas over relatively short distances (exhaust pressure ≤ 5 MPa). Wellhead oil and gas, on the other hand, are primarily gas with small amounts of oil and water. For long-distance transportation (exhaust pressure ≥ 10 MPa, oil-to-gas volume ratio ≤ 1:9), these mixed-transport pumps are inadequate.

[0003] Currently, long-distance gathering and transportation of oil and gas from wellheads with low oil content (exhaust pressure ≥ 10MPa, oil and gas volume ratio in exhaust state is 1:9) can only be achieved by using large-scale oil and gas gathering and transportation equipment.

[0004] However, the advent of the piston-type oil-gas mixing machine has filled the gap in large-scale oil and gas gathering and transportation equipment. For details, see our company's development of a piston-type oil-gas mixing machine for oilfield wellhead gas gathering and transportation, patent number CN202311448942.1, which can achieve "long-distance gathering and transportation of oil and gas from wellheads with low oil content (exhaust pressure ≥10MPa, oil-to-gas volume ratio in exhaust state is 1:9). The oil-gas mixing device is the core component of the piston-type oil-gas mixing machine. The oil-gas mixing device must fully mix the oil, gas, and liquid in the oilfield wellhead oil and gas before it can be input into the piston-type oil-gas mixing machine. This ensures that the mixed oil, liquid, and gas will not produce liquid hammer when it enters the cylinder body and is pressurized. Otherwise, oil and water will form in the piston-type oil-gas mixing machine cylinder, causing liquid hammer, making the piston-type oil-gas mixing machine inoperable. Therefore, the oil-gas mixing device is the key to the success of the piston-type oil-gas mixing machine. Summary of the Invention

[0005] The purpose of the present invention is to provide a device that can achieve full and complete mixing of oil, gas and liquid in the oil and gas at the wellhead of the oil field, ensuring that no liquid hammer will occur when the piston-type oil-gas mixing machine is pressurized in the cylinder body. The core component of the piston-type oil-gas mixing machine, the "oil-gas mixing device", is creatively invented.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] An oil-gas mixing device for a piston-type oil-gas mixing machine, the oil-gas mixing device is composed of an oil-gas inlet component, an oil-gas mixing component and an oil-gas mixing component connected in sequence.

[0008] The oil and gas inlet component is composed of a straight tee and a reducing pipe, and the reducing pipe adopts a zoom type pipeline structure.

[0009] The oil-gas mixing component is composed of a shoulder flange and a sleeve. The sleeve is provided with left-handed guide fins and right-handed guide fins. The left-handed guide fins and right-handed guide fins are sequentially arranged at intervals along the length direction of the sleeve.

[0010] The interior of the oil-gas mixing component is a multi-layer tube structure, and the oil-gas mixing component is composed of an inner sleeve hole tube, an outer sleeve hole tube and an outer tube in sequence from the inside to the outside. There is a gap between the outer sleeve hole tube, the inner sleeve hole tube and the outer tube. Small holes are evenly opened on the surfaces of the outer sleeve hole tube and the inner sleeve hole tube. An inlet pipe is provided on the side of the outer tube and an outlet pipe is provided at the bottom. The outlet pipe is connected to the bottom of the inner sleeve hole tube.

[0011] Preferably, the oil and gas inlet component adopts a one-inlet and two-outlet three-way structure, consisting of an oil and gas input end and two oil and gas output ends. Both oil and gas output ends are straight-through ends, and the diameter area of the oil and gas input end is 1.25 times the sum of the diameter areas of the two oil and gas output ends.

[0012] Preferably, the reducing pipe is symmetrically welded to the two straight oil and gas output ends of the straight tee.

[0013] Preferably, the oil and gas input end of the positive tee is provided with an inlet flange, which is connected to the oil and gas input pipeline, and the oil and gas output end of the reducer is provided with an outlet flange, and the oil and gas inlet component is connected to the oil and gas input end of the oil and gas mixing component through the outlet flange.

[0014] Preferably, the shoulder ring flanges of the oil-gas mixing component are welded to both ends of the casing respectively, one end of the casing is connected to the oil and gas output end of the oil and gas inlet component through the shoulder ring flange, and the other end is connected to the oil and gas input end of the oil-gas mixing component through the shoulder ring flange.

[0015] Preferably, the small holes on the outer perforated tube and the small holes on the inner perforated tube are staggered, the sum of the diameter areas of the small holes on the outer perforated tube is the same as the diameter area of the oil and gas output end at one end of the oil and gas inlet component, and the sum of the diameter areas of the small holes on the inner perforated tube is 5 to 10% smaller than the sum of the diameter areas of the small holes on the outer perforated tube.

[0016] Preferably, a cover plate is provided on the top of the outer tube and a blocking plate is provided on the bottom. The outer sleeve tube and the outer tube are clamped and fixed between the cover plate and the blocking plate. The outlet pipe is welded to the center of the blocking plate.

[0017] Preferably, a positioning cover and a shoulder ring flange are further provided on the top of the oil-gas mixing component. The shoulder ring flange is welded to the top end of the outer tube. The positioning cover is located inside the shoulder ring flange. A positioning ring groove matching the upper ends of the inner sleeve tube and the outer sleeve tube is provided on the bottom surface of the positioning cover. The pressure cover is arranged above the positioning cover and is fixedly connected to the shoulder ring flange by fastening bolts. A sealing ring is also provided between the pressure cover and the shoulder ring flange for sealing.

[0018] Preferably, the blocking plate is welded to the bottom end of the outer tube, and a positioning boss is provided on the upper surface of the blocking plate to match the lower end of the outer sleeve orifice tube. The outlet pipe is welded to the blocking plate, and a positioning socket is provided on the upper end of the outlet pipe to match the lower end of the inner sleeve orifice tube.

[0019] Preferably, the front end of the inlet connecting pipe is provided with an inlet flange and a slip-on flange, and the inlet connecting pipe is connected to the oil and gas output end of the oil-gas mixing component through the inlet flange and the slip-on flange. The lower end of the outlet connecting pipe is provided with an outlet flange and a rib plate, and the rib plate is welded between the outlet flange, the blocking plate and the outlet connecting pipe.

[0020] Preferably, the connection between the oil-gas inlet component and the oil-gas mixing component, and the connection between the oil-gas mixing component and the oil-gas mixing component are all connected and fixed by flange structures, and the connection is provided with a sealing ring for sealing.

[0021] Compared with existing technologies, the advantages of the present invention are: the oil-gas mixing device of the present invention is a core front-end component of a piston-type oil-gas mixing machine. It can achieve full and complete mixing of oil, gas, and liquid in the oil and gas at the wellhead of an oilfield, ensuring that the piston-type oil-gas mixing machine does not produce liquid hammer during pressurization within the cylinder. It is suitable for use with various piston-type oil-gas mixing machines. In addition, the present invention has a simple structure, is easy to manufacture, requires no special material requirements, and has low manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic structural diagram of the oil and gas inlet component of the present invention;

[0024] Figure 3 This is a schematic structural diagram of the oil-gas mixing component of the present invention;

[0025] Figure 4 This is a schematic structural diagram of the oil-gas mixing component of the present invention;

[0026] Figure 5 The figure is a schematic diagram of the assembly structure of the present invention and a piston-type oil-gas mixed transmission machine.

[0027] In the picture:

[0028] 1. Oil and gas inlet components: 11. Inlet flange; 12. Straight tee; 13. Reducing pipe; 14. Outlet flange.

[0029] 2. Oil-gas mixing components: 21. Shoulder flange; 22. Casing; 23. Left-handed guide fin; 24. Right-handed guide fin.

[0030] 3. Oil-gas mixing components: 31. Cover plate; 32. Sealing gasket; 33. Positioning cover; 34. Inner sleeve tube; 35. Outer sleeve tube; 310. Shoulder ring flange; 311. Outer tube; 312. Blocking plate; 313. Outlet pipe; 314. Rib plate; 315. Outlet flange; 316. Inlet flange; 317. Inlet pipe; 318. Movable flange.

[0031] 4. Sealing ring;

[0032] 5. Piston type oil-gas mixed transmission machine. DETAILED DESCRIPTION

[0033] The oil-gas mixing device of the present invention is the front core component of the piston type oil-gas mixing machine 5, which can achieve full and complete mixing of oil, gas and liquid in the oil and gas at the wellhead of the oil field, ensuring that no liquid hammer will occur when the cylinder of the piston type oil-gas mixing machine 5 is pressurized. It is suitable for various oil-gas mixing devices for piston type oil-gas mixing machines 5, see Figure 5 .

[0034] The present invention will be further described below. A piston-type oil-gas mixing device for an oil-gas mixing machine is composed of an oil-gas inlet component 1, an oil-gas mixing component 2 and an oil-gas mixing component 3 connected in sequence. Figure 1 The oil and gas inlet component 1 is used to take in the gas-liquid mixture, the oil and gas mixing component 2 fully mixes the oil, gas and liquid in the oil and gas, and the oil and gas mixing component 3 breaks up and disperses the mixed gas and mixes it completely.

[0035] The structure of the oil and gas inlet component 1 is designed as follows: Figure 2 The oil and gas inlet component 1 adopts a one-inlet and two-outlet three-way structure, consisting of an oil and gas input end and two oil and gas output ends. Both oil and gas output ends are straight-through ends. The inlet and outlet gas path area ratio of the conventional three-way structure is 1:2. At this time, the gas flow rate in the oil and gas inlet component 1 is too slow, and it is difficult to obtain good mixing in the oil and gas mixing component 2. By calculating that the path area of the oil and gas input end is 1.25 times the sum of the path areas of the two oil and gas output ends, the mixing effect in the oil and gas mixing component 2 is the best.

[0036] Therefore, in order to change the inlet and outlet diameter areas of the oil and gas inlet component 1, the structure of the oil and gas inlet component 1 has been designed. The oil and gas inlet component 1 is composed of a straight tee 12 and a reducing pipe 13. The reducing pipe 13 is symmetrically welded to the two straight oil and gas output ends of the straight tee 12. The reducing pipe 13 adopts a zooming pipe structure, which can ensure the stable outflow of oil and gas, and its pressure increases where the pipe diameter is reduced, which is more conducive to the mixing of oil and gas in the oil and gas mixing component 2. The oil and gas input end of the straight tee 12 is provided with an inlet flange 11, which is connected to the oil and gas input pipeline. The oil and gas output end of the reducing pipe 13 is provided with an outlet flange 14. The oil and gas inlet component 1 is connected to the oil and gas input end of the oil and gas mixing component 2 through the outlet flange 14.

[0037] The manufacturing requirements of the oil and gas inlet component 1 are as follows:

[0038] The reducing pipe 13 and the outlet flange 14 are manufactured by butt welding; and the inlet flange 11, the straight tee 12, the reducing pipe 13, and the outlet flange 14 are all standard parts, which are easy to purchase and easy to manufacture.

[0039] The structure of the oil-gas mixing component 2 is designed as follows. Figure 3 The oil-gas mixing component 2 is composed of a shoulder flange 21 and a sleeve 22. The sleeve 22 is provided with left-handed guide fins 23 and right-handed guide fins 24. The left-handed guide fins 23 and right-handed guide fins 24 are sequentially spaced along the length of the sleeve 22. The design of the left-handed guide fins 23 and right-handed guide fins 24 within the sleeve 22 allows the flow of oil and gas within the sleeve 22 to continuously change direction, causing the oil and gas molecules to collide and mix to form a turbulent state, thereby achieving mixing of oil, gas, and liquid. The shoulder flanges 21 are welded to both ends of the sleeve 22. One end of the sleeve 22 is connected to the oil and gas output end of the oil and gas inlet component 1 through the shoulder flange 21, and the other end is connected to the oil and gas input end of the oil and gas mixing component 3 through the shoulder flange 21.

[0040] The manufacturing requirements of the oil-gas mixing component 2 are as follows:

[0041] The oil-gas mixing component 2 is formed by butt-welding a flange and a steel pipe to form a shell side, and left-hand and right-hand guide fins are alternately installed in the shell side. The shoulder ring flange 21 and the sleeve 22 are standard pipes; the left-hand and right-hand guide fins 23 and 24 are formed by rolling stainless steel strips, which has a simple manufacturing process and low manufacturing cost.

[0042] As a preferred solution, the connection between the oil-gas inlet component 1 and the oil-gas mixing component 2, and the connection between the oil-gas mixing component 2 and the oil-gas mixing component 3 are all fixed with flange structures, which are easy to install and connect, and sealing rings 4 are provided at the connections to perform sealing.

[0043] The structural design of the oil-gas mixing component 3 is as follows: Figure 4 The interior of the oil-gas mixing component 3 is a multi-layer tube structure. The oil-gas mixing component 3 is composed of an inner sleeve hole tube 34, an outer sleeve hole tube 35 and an outer tube 311 from the inside to the outside. There is a gap between the outer sleeve hole tube 35 and the inner sleeve hole tube 34 and the outer tube 311. Small holes are evenly opened on the surface of the outer sleeve hole tube 35 and the inner sleeve hole tube 34. The small holes on the outer sleeve hole tube 35 and the inner sleeve hole tube 34 can break up and disperse the mixed gas and mix it completely. The side of the outer tube 311 is provided with an inlet connecting pipe 317. The inlet connecting pipe 317 is provided on the side of the outer tube 311. The pipe 317 serves as the oil and gas inlet end and is connected to the oil and gas mixing component 2. The top of the outer pipe 311 is provided with a cover plate 31, and the bottom is provided with a plugging plate 312. The outer perforated pipe 35 and the outer pipe 311 are clamped and fixed between the cover plate 31 and the plugging plate 312. The center of the plugging plate 312 is provided with an outlet pipe 313. The outlet pipe 313 is connected to the bottom of the inner perforated pipe 34. The gas that has been dispersed and completely mixed is discharged into the piston-type oil and gas mixing machine 5 through the outlet pipe 313. The assembly diagram of the piston-type oil and gas mixing machine 5 is shown in FIG. Figure 5 .

[0044] In order to achieve better dispersion and even separation of the mixed gas in the oil-gas mixing component 3, the small holes on the outer sleeve hole tube 35 and the inner sleeve hole tube 34 are designed. The small holes on the outer sleeve hole tube 35 and the small holes on the inner sleeve hole tube 34 are staggered and will not directly convect and pass through, so as to achieve a better secondary equalization effect.

[0045] According to experimental test results, as a preferred solution, the sum of the diameter areas of the small holes on the outer perforated tube 35 is the same as the diameter area of the oil and gas output end at one end of the oil and gas inlet component 1, and the sum of the diameter areas of the small holes on the inner perforated tube 34 is 5 to 10% smaller than the sum of the diameter areas of the small holes on the outer perforated tube 35. In this way, the mixed gas after being evenly divided once by the outer perforated tube 35 is accelerated when passing through the small holes on the inner perforated tube 34 to meet the design requirements. At this time, the even distribution effect is the best, which can ensure that the oil, gas and liquid in the oil and gas are fully mixed.

[0046] In order to facilitate the positioning and installation of the inner sleeve orifice tube 34 and the outer sleeve orifice tube 35 in the outer tube 311, a positioning cover 33 and a shoulder ring flange 310 are further provided on the top of the oil-gas mixing component 3. The shoulder ring flange 310 is welded to the top of the outer tube 311. The positioning cover 33 is located in the shoulder ring flange 310. The pressure cover 31 is arranged above the positioning cover 33 and is fixedly connected to the shoulder ring flange 310 by fastening bolts. The positioning cover 33, the sleeve orifice tube 34 and the outer sleeve orifice tube 35 can be installed by opening the pressure cover 31. A sealing gasket 32 is also provided between the pressure cover 31 and the shoulder ring flange 310 for sealing.

[0047] In order to facilitate the installation and positioning of the inner orifice tube 34 and the outer orifice tube 35, a positioning cover 33 is designed. The bottom surface of the positioning cover 33 is provided with a positioning ring groove that matches the upper ends of the inner orifice tube 34 and the outer orifice tube 35. The blocking plate 312 is welded to the bottom end of the outer tube 311. The upper surface of the blocking plate 312 is provided with a positioning boss that matches the lower end of the outer orifice tube 35. The outlet pipe 313 is welded to the blocking plate 312. The upper end of the outlet pipe 313 is provided with a positioning bayonet that matches the lower end of the inner orifice tube 34. The installation and positioning fixation of the upper and lower ends of the inner orifice tube 34 and the outer orifice tube 35 are achieved through the design of the positioning ring groove.

[0048] The front end of the inlet pipe 317 is provided with an inlet flange 316 and a slip-on flange 318. The inlet pipe 317 communicates with the oil and gas output port of the oil-gas mixing component 2 via the inlet flange 316 and slip-on flange 318. The lower end of the outlet pipe 313 is provided with an outlet flange 315 and a rib 314. The rib 314 is welded between the outlet flange 315, the blocking plate 312, and the outlet pipe 313. The slip-on flange 318 is unaffected by the screw hole orientation of the shoulder flange 21 of the connected oil-gas mixing component 2. Therefore, the oil-gas mixing device for a piston-type oil-gas mixing machine is very easy to install. Furthermore, the oil and gas liquid inlet flange is also adjustable.

[0049] The manufacturing requirements of the oil-gas mixing component 3 are as follows:

[0050] Among them, the pressure cover 31 and the sealing gasket 32 are standard parts, and the positioning cover 33, the inner sleeve hole tube 34, and the outer sleeve hole tube 35 are machined parts. The positioning cover 33 is a disc part, one side of which is processed with a positioning ring groove as required, and the other side has no requirements, so there is no processing difficulty; the inner sleeve hole tube 34 and the outer sleeve hole tube 35 are two steel pipes with different diameters; a number of small holes are drilled on the steel pipes as required, and there is no processing difficulty. The shoulder ring flange 310, outer tube 311, plugging plate 312, outlet pipe 313, rib plate 314, outlet flange 315, inlet flange 316, inlet pipe 317 and slip-on flange 318 are welded together to form the shell side; among them, the shoulder ring flange 310, outlet flange 315, inlet flange 316 and slip-on flange 318 are standard parts and easy to purchase; the outer tube 311 is made of steel pipe with welding grooves processed at both ends, and then the inlet pipe 317 is processed as required to insert the welding hole and groove; the plugging plate 312 is a disc-shaped part, which is processed from plate, and one side is processed with a positioning boss and the inlet pipe 317 is inserted into the welding hole and groove; the rib plate 314 is a gas-cut and polished part; the inlet pipe 317 is made of steel pipe, and one end is processed with a welding groove; the inserted welding end is processed into a crescent-shaped positioning bayonet as required; the above processing and manufacturing are not difficult.

[0051] The above is a detailed introduction to the oil-gas mixing device for a piston-type oil-gas mixing machine provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes, and changes and improvements to the present invention will be possible without exceeding the concept and scope specified in the appended claims. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An oil-gas mixing device for a piston-type oil-gas mixing machine, characterized in that: The oil-gas mixing device is composed of an oil-gas inlet component (1), an oil-gas mixing component (2) and an oil-gas mixing component (3) which are connected in sequence. The oil and gas inlet component (1) is composed of a straight tee (12) and a reducing pipe (13), and the reducing pipe (13) adopts a zoom-type pipeline structure. The oil-gas mixing component (2) is composed of a shoulder flange (21) and a sleeve (22). The sleeve (22) is provided with a left-handed guide fin (23) and a right-handed guide fin (24). The left-handed guide fin (23) and the right-handed guide fin (24) are sequentially arranged at intervals along the length direction of the sleeve (22). The interior of the oil-gas mixing component (3) is a multi-layered tube structure. The oil-gas mixing component (3) is formed by sequentially inserting an inner sleeve hole tube (34), an outer sleeve hole tube (35), and an outer tube (311) from the inside to the outside. Gaps are left between the outer sleeve hole tube (35), the inner sleeve hole tube (34), and the outer tube (311). Small holes are evenly opened on the surfaces of the outer sleeve hole tube (35) and the inner sleeve hole tube (34). An inlet pipe (317) is provided on the side of the outer tube (311), and an outlet pipe (313) is provided on the bottom. The outlet pipe (313) is communicated with the bottom of the inner sleeve hole tube (34).

2. The oil-gas mixing device for a piston-type oil-gas mixing machine according to claim 1, characterized in that: The oil and gas inlet component (1) adopts a three-way structure with one inlet and two outlets, and is composed of an oil and gas input end and two oil and gas output ends. Both oil and gas output ends are straight-through ends, and the diameter area of the oil and gas input end is 1.25 times the sum of the diameter areas of the two oil and gas output ends.

3. The oil-gas mixing device for a piston-type oil-gas mixing machine according to claim 2, characterized in that: The reducing pipe (13) is symmetrically welded to the two straight oil and gas output ends of the straight tee (12).

4. The oil-gas mixing device for a piston-type oil-gas mixing machine according to claim 3, characterized in that: The oil and gas input end of the positive tee (12) is provided with an inlet flange (11), and the inlet flange (11) is connected to the oil and gas input pipeline. The oil and gas output end of the reducing pipe (13) is provided with an outlet flange (14), and the oil and gas inlet component (1) is connected to the oil and gas input end of the oil and gas mixing component (2) through the outlet flange (14).

5. The oil-gas mixing device for a piston-type oil-gas mixing machine according to claim 1, characterized in that: The shoulder flange (21) of the oil-gas mixing component (2) is welded to both ends of the sleeve (22), one end of the sleeve (22) is connected to the oil-gas output end of the oil-gas inlet component (1) through the shoulder flange (21), and the other end is connected to the oil-gas input end of the oil-gas mixing component (3) through the shoulder flange (21).

6. The oil-gas mixing device for a piston-type oil-gas mixing machine according to claim 1, characterized in that: The small holes on the outer orifice tube (35) and the small holes on the inner orifice tube (34) are staggered, the sum of the diameter areas of the small holes on the outer orifice tube is the same as the diameter area of the oil and gas output end at one end of the oil and gas inlet component, and the sum of the diameter areas of the small holes on the inner orifice tube is 5 to 10% smaller than the sum of the diameter areas of the small holes on the outer orifice tube.

7. The oil-gas mixing device for a piston-type oil-gas mixing machine according to claim 1, characterized in that: The top of the outer tube (311) is provided with a cover plate (31), and the bottom is provided with a blocking plate (312). The outer sleeve (35) and the outer tube (311) are clamped and fixed between the cover plate (31) and the blocking plate (312). The outlet pipe (313) is welded to the center of the blocking plate (312).

8. The oil-gas mixing device for a piston-type oil-gas mixing machine according to claim 7, characterized in that: The top of the oil-gas mixing component (3) is further provided with a positioning cover (33) and a shoulder ring flange (310). The shoulder ring flange (310) is welded to the top end of the outer tube (311). The positioning cover (33) is located inside the shoulder ring flange (310). The bottom surface of the positioning cover (33) is provided with a positioning ring groove that matches the upper ends of the inner sleeve tube (34) and the outer sleeve tube (35). The pressure cover (31) is arranged above the positioning cover (33) and is fixedly connected to the shoulder ring flange (310) by fastening bolts. A sealing gasket (32) is further provided between the pressure cover (31) and the shoulder ring flange (310) for sealing.

9. The oil-gas mixing device for a piston-type oil-gas mixing machine according to claim 7, characterized in that: The blocking plate (312) is welded to the bottom end of the outer tube (311), and a positioning boss is provided on the upper surface of the blocking plate (312) to match the lower end of the outer sleeve tube (35). The outlet pipe (313) is welded to the blocking plate (312), and a positioning socket is provided on the upper end of the outlet pipe (313) to match the lower end of the inner sleeve tube (34).

10. The oil-gas mixing device for a piston-type oil-gas mixing machine according to claim 1, characterized in that: The front end of the inlet pipe (317) is provided with an inlet flange (316) and a slip-on flange (318), and the inlet pipe (317) is connected to the oil and gas output end of the oil and gas mixing component (2) through the inlet flange (316) and the slip-on flange (318). The lower end of the outlet pipe (313) is provided with an outlet flange (315) and a rib plate (314), and the rib plate (314) is welded between the outlet flange (315), the blocking plate (312), and the outlet pipe (313).

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