Inlet included angle adjustable jet pump suitable for conveying particles with multiple particle sizes

Abstract

The invention relates to an inlet included angle adjustable jet pump suitable for conveying particles with multiple particle sizes, and aims to solve the problem of erosive wear when a traditional jet pump conveys fluid containing solid particles. By additionally arranging the four flow guide pipelines and the angle-adjustable suction pipeline, the design of the mixing chamber is optimized, vortexes and turbulent flows are reduced, the flow resistance is reduced, and the energy transfer efficiency is improved. The design can meet the conveying requirements of particles with different particle sizes, erosive wear is reduced, the service life of the pump body is prolonged, and the application range of the jet pump is widened.

Description

Technical Field

[0001] The invention relates to the field of jet pumps, in particular to a jet pump with adjustable inlet angle suitable for conveying particles with multiple particle sizes. Background Art

[0002] A jet pump is a mechanical device that achieves fluid transportation through momentum exchange of high-speed fluid. It is widely used in water conservancy projects, petrochemicals, aerospace and other fields because of its no moving parts, simple structure, excellent sealing and convenient operation. However, in application scenarios such as oil and gas production in oil and gas wells, sand removal operations, and silt removal in rivers and reservoirs, the inhaled fluid often contains a large number of solid particles. Driven by the working fluid, these solid particles continuously impact the pump wall at a certain speed and angle, causing severe erosion and wear of the pump body. Under long-term operation, wear will cause the structural strength of the pump body to decrease and the seal to fail, thereby affecting the operating efficiency and service life of the pump, increasing the maintenance cost of the equipment, and limiting its application under high-intensity and long-term working conditions.

[0003] The flow field inside the mixing chamber of a traditional jet pump is relatively turbulent. After the fluid enters the mixing chamber, it is easy to generate eddies or unstable streamlines, which in turn increases the flow resistance and even causes a backflow vortex. In addition, most existing optimization designs are only suitable for the transmission of one or a few particle sizes, and it is difficult to meet the transportation needs of particles of various sizes that may appear in actual engineering. These problems seriously affect the energy transfer efficiency of the jet pump, resulting in a decline in overall performance.

[0004] To solve the above problems, this study proposed a jet pump with an adjustable inlet angle suitable for multi-size particle transportation. This structure aims to reduce eddy and turbulent phenomena and flow resistance by optimizing the design of the mixing chamber, thereby improving energy transfer efficiency and overall performance. Specifically, this study added four guide pipes connected to the inlet of the working fluid to the jet pump, and designed an intake pipe with an adjustable inlet angle, so that it can adjust the flow state in the mixing chamber according to the different particle sizes of the particles. This design not only helps to reduce erosion and wear in the flow and extend the service life of the pump body, but also can adapt to the particle transportation needs under different working conditions, and broaden the application scope of the jet pump in high-intensity and long-term operations. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention designs a jet pump with an adjustable inlet angle suitable for conveying particles of multiple particle sizes. The structure is intended to solve the problems existing in the background technology, especially to cope with the complex situation of conveying particles of multiple particle sizes that may occur in actual working conditions. Through optimized design, the present invention effectively reduces the vortex phenomenon in the mixing chamber while reducing the erosion rate. In the design of traditional jet pumps, the suction pipe and the working fluid pipe are usually kept vertical, while the present invention improves it into an adjustable angle structure and has a fastening function. Through the adjustable angle design, the present invention can optimize the flow state in the mixing chamber, thereby adapting to the conveying needs of particles of different particle sizes. In addition, the present invention also evenly adds four guide pipes between the working fluid inlet pipe and the mixing chamber. With the help of the lateral velocity of the working fluid inlet and the adjusted pipe angle, the fluid with particles is effectively prevented from directly impacting the pump wall, reducing erosion and wear. The above design further improves the stability of the flow field in the mixing chamber by enhancing the velocity component of the suction fluid in the axial direction. The orderly flow of the fluid not only effectively alleviates the wall erosion problem, but also ensures the efficient operation and long service life of the jet pump.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The basic technical solution provided by the present invention is: an inlet angle adjustable jet pump suitable for conveying particles of multiple particle sizes, comprising a jet pump housing, a mainstream pipeline, a suction pipeline, an outlet pipeline and an adjustable angle connector, wherein the jet pump housing is provided with inner and outer double-layer fluid pipelines, including a nozzle, a mixing chamber, a throat and a diffuser, wherein the outlet of the mixing chamber is interconnected with the inlet of the throat, and the outlet of the throat is interconnected with the inlet of the diffuser; the mainstream pipeline comprises a working fluid inlet pipeline and four guide pipelines, wherein the four guide pipelines are connected and distributed at intervals of 90°, and are connected to the nozzle of the nozzle; The working fluid inlet pipeline is connected to the jet pump housing; the sucked pipeline is connected to the jet pump housing through a bellows, and the angle is adjusted and fixed by an adjustable angle connector to reduce the direct impact of the sucked fluid on the inner wall of the jet pump. The adjustable angle connector includes a pair of slides and set screws, which can achieve the angle between the sucked pipeline and the working fluid pipeline to be adjusted and fastened at any angle within 30° to 90°. The surface of the slide is provided with anti-slip patterns and engraved with angles for easy selection; the outlet pipeline is connected to the diffuser of the jet pump housing;

[0008] The jet pump uses the momentum exchange principle of high-speed jet to achieve fluid delivery. Its working process includes: first, the driving fluid forms a high-speed jet through the nozzle, generating low-pressure suction to suck in the external fluid; then, in the mixing chamber, the inhaled fluid is accelerated by momentum transfer; finally, the fluid passes through the diffuser, converts part of the kinetic energy into static pressure energy, and completes the pressurization and delivery of the fluid. By adding four evenly distributed guide pipes, a certain amount of high-speed working fluid is injected into the mixing chamber to enhance the axial velocity component of the flow field in the mixing chamber. At the same time, by changing the angle design of the suction pipe in the traditional jet pump, the fluid entrained with particles is avoided from directly impacting the pump wall, fundamentally reducing the erosion effect of high-energy particles on the wall. This design significantly improves the velocity component of the sucked fluid in the axial direction, making the movement of the fluid in the mixing chamber more orderly and stable, and effectively reducing the probability of eddy currents and turbulence. This improvement also reduces the scouring effect of the local high-pressure area on the pump wall, delays the wear process of the equipment, and significantly extends its service life while ensuring the efficient operation of the jet pump.

[0009] The beneficial effects of the present invention are:

[0010] ① The present invention adds a bellows and combines it with an adjustable angle design, so that the angle between the suction pipe and the mixing chamber can be freely adjusted within the range of 30° to 90°, avoiding the fluid carrying particles directly impacting the wall of the jet pump. The bellows design makes the angle adjustment more flexible and stable, reduces erosion and wear, and at the same time increases the velocity component of the fluid in the axial direction, enhances the orderliness of the flow field in the mixing chamber, and thus significantly improves the fluid delivery efficiency.

[0011] ② The present invention adds four evenly distributed guide pipes between the mainstream pipe and the mixing chamber. By injecting high-speed working fluid, the axial momentum of the fluid in the mixing chamber is enhanced, the smoothness of the fluid flow and the streamline stability are improved, the occurrence probability of vortex and turbulence in the mixing chamber is significantly reduced, the flow resistance is reduced, and the energy transfer efficiency of the jet pump is improved.

[0012] ③ By adjusting the angle of the sucked pipe and optimizing the diversion design, the present invention can adapt to the transportation needs of particles of multiple sizes. It not only improves the operating efficiency of the pump body under high-intensity working conditions, but also broadens the application scope of the jet pump in complex projects such as oil and gas extraction and silt desilting.

[0013] ④ The present invention adopts a set screw and slide groove design, combined with the bellows above the suction pipe to achieve flexible adjustment and rapid fixation of the suction pipe angle, improves the adaptability of the equipment under different working conditions, and ensures a stable structure and convenient operation.

[0014] ⑤ Based on the above design optimization, the present invention effectively alleviates the scouring effect of the local high-pressure area on the pump wall, further delays the wear process of the pump body, greatly extends the service life of the jet pump, and reduces the operation and maintenance costs of the equipment, ensuring its reliability and stability under long-term, high-intensity working conditions.

[0015] Preferably, the mainstream pipe and the suction pipe in the housing of the jet pump are made of wear-resistant materials. Commonly used wear-resistant materials include high-strength, wear-resistant composite materials such as hard alloy, ceramic coating, wear-resistant steel and polyurethane. These wear-resistant materials have excellent wear resistance and can effectively prevent solid particles from directly wearing the inner wall of the pipe during fluid transportation. In addition, the surface of the pipe can also be treated with special surface treatment technology, such as electroplating or spraying wear-resistant coating, to further improve its erosion resistance.

[0016] Through the above settings, the wear-resistant characteristics of the mainstream pipeline and the suction pipeline can significantly reduce the erosion and wear of the solid particles on the inside of the pump body during the flow process. After the solid particles enter the jet pump together with the fluid, after a long time and high-intensity transportation, they will cause certain impact and wear on the inner wall of the pipeline, especially when transporting particles of multiple particle sizes. This wear effect is more obvious. By using wear-resistant materials, the degree of wear of the pipeline can be significantly reduced, thereby effectively extending the service life of the jet pump equipment.

[0017] Preferably, the matching structure of the slide slot and the set screw of the adjustable angle connector is further optimized to be designed in combination with a high-strength locking device. The locking device includes a high-strength locking nut and a shock-proof washer. The high-strength locking nut is tightened by rotation to ensure that the adjusted pipe angle is continuously and stably fixed under high-pressure and high-strength working conditions. The shock-proof washer is arranged between the set screw and the pipe and is made of rubber or polyurethane material to absorb external vibration and pressure fluctuations, reduce loosening or deviation caused by vibration, and ensure stability.

[0018] Through the above device, the high-strength locking nut is tightened by rotation to ensure that the adjusted pipe angle is continuously and stably fixed under high pressure and high strength conditions. The anti-vibration washer is set between the set screw and the pipe. It is made of rubber or polyurethane material to absorb external vibration and pressure fluctuations, reduce loosening or deviation caused by vibration, and ensure stability. The design of the locking device and anti-vibration washer effectively improves the stability and durability of the jet pump in high vibration and pressure fluctuation environments.

[0019] Preferably, the mixing chamber adopts a transparent structure, and the material can be selected from high-strength transparent materials such as polycarbonate (PC) or acrylic acid (PMMA) to facilitate observation of the internal flow. At the same time, the inlet pipe of the sucked fluid is designed as an adjustable structure, which can adjust the inlet angle through a rotating or sliding mechanism, and set scale marks to assist in angle selection. In order to ensure stability after adjustment, a locking device is added to the adjustment mechanism. In addition, the connection of the transparent mixing chamber adopts a high-precision sealing structure, such as an O-ring seal, and cooperates with a flange or threaded connection to ensure sealing performance in a high-pressure fluid environment.

[0020] Through the above device, the transparent mixing chamber can provide real-time visualization of the internal flow, so that the operator can directly observe the flow when adjusting the inlet pipe angle, so as to facilitate the selection of the appropriate angle and optimize the flow effect. At the same time, the surface of the mixing chamber is optically polished to reduce reflections and visual distortion, and an LED light source is set on the outside to enhance the visibility of the fluid. In order to more accurately analyze the flow characteristics in the mixing chamber, the outer surface of the transparent mixing chamber can be provided with flow reference marks (such as grids or scale lines) to further improve the accuracy of observation.

[0021] Preferably, the inner wall of the diversion pipe is treated with a special smooth coating to reduce fluid friction resistance.

[0022] Through the above-mentioned settings, the smooth coating on the inner wall can significantly reduce the friction loss of the fluid in the pipeline and reduce the unnecessary consumption of energy. The application of the smooth coating can effectively reduce the friction coefficient between the inner wall of the pipeline and the fluid, thereby reducing pressure loss and increasing the flow rate of the fluid. Under high flow and high pressure conditions, this friction reduction effect is particularly significant, which can significantly optimize the flow state in the mixing chamber, promote a more uniform distribution of the fluid, improve the energy transfer efficiency of the jet pump, and further enhance the delivery capacity of the pump. In addition, the corrosion resistance and wear resistance of the coating material can maintain the stability of the coating during long-term use, thereby improving the durability and reliability of the system.

[0023] Preferably, the inner wall of the diffuser is designed to have a spiral texture structure to optimize the flow state of the fluid outlet.

[0024] Through the above settings, the spiral texture structure can effectively reduce the flow separation phenomenon in the diffuser, reduce the formation of turbulence and vortices, and thus improve the outlet flow state of the fluid. The spiral texture guides the fluid to produce a rotational flow along the tube wall, effectively converting the kinetic energy of the fluid into static pressure energy more efficiently, thereby improving the stability and outlet efficiency of fluid transportation. This structure can not only improve the transmission efficiency of the fluid, but also reduce energy loss. Especially under high flow and high pressure flow conditions, the design of the spiral texture helps optimize the flow field and improve the working efficiency of the pump. In addition, the spiral texture can also reduce the backflow and turbulence of the fluid in the diffuser, which helps to maintain efficient and stable output of the fluid and improve the long-term reliability of the system.

[0025] Preferably, a removable wear-resistant liner is added to the inner wall of the mixing chamber to further protect the pump body under high-intensity working conditions.

[0026] Through the above settings, the removable wear-resistant liner can provide additional protection in high-wear environments, especially in fluid environments with high particulate matter content. The wear-resistant liner effectively prevents damage to the inner wall of the mixing chamber due to wear. The liner is designed to be removable, which is convenient for timely replacement after the pump body is worn, thereby extending the service life of the pump body and reducing maintenance and replacement costs. The removable liner can also select wear-resistant layers of different materials according to actual use to meet the needs of different fluids and working conditions, providing more targeted protection. At the same time, this design also makes regular inspection and maintenance work more convenient, improves the overall operating efficiency and economy of the equipment, and ensures that the pump body is always in the best working condition.

[0027] Preferably, the jet pump may be equipped with a real-time monitoring system capable of dynamically tracking key parameters such as fluid pressure, flow rate and particle concentration in the pump.

[0028] Through the above settings, the real-time monitoring system can continuously collect and record key parameters such as fluid pressure, flow rate, particle concentration, etc. during the operation of the pump to ensure the normal operation of the pump under complex working conditions. This system can monitor and analyze the working status of the pump in real time, and promptly detect any abnormal conditions, such as pressure fluctuations, unstable flow rate or abnormal particle concentration, to help operators adjust the operating parameters in time to prevent equipment failures. The monitoring system can provide operators with accurate data support, which not only improves the management efficiency of the pump, but also provides a basis for the maintenance and optimization of the equipment. In addition, the real-time monitoring system is linked with the intelligent control system to further improve the working efficiency and safety of the pump by automatically adjusting the operating status of the pump. In the long run, the application of the real-time monitoring system can reduce downtime, reduce maintenance costs, extend the service life of the equipment, and improve the overall performance of the jet pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings in the following description are embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A three-dimensional diagram of a jet pump with adjustable inlet angle suitable for conveying particles of various sizes as described in the example.

[0031] Figure 2 for Figure 1 Front view cross-section.

[0032] Figure 3 for Figure 1 Left view of .

[0033] Figure 4 This is the streamline diagram of the water flow containing particles in a traditional jet pump.

[0034] Figure 5 This is a streamline diagram of the particle-containing water flow of a jet pump with an adjustable inlet angle suitable for conveying particles of multiple particle sizes.

[0035] In the figure: 1-jet pump housing; 2-main stream pipeline; 3-suction pipeline; 4-export pipeline; 5-working fluid inlet pipeline; 6-guiding pipeline; 7-nozzle; 8-mixing chamber; 9-contraction tube; 10-throat; 11-diffuser; 12-adjustable angle connector; 13-slideway; 14-fastening screw. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] like Figure 1 and Figure 2 As shown, the novel high-efficiency anti-wear jet pump described in the present invention includes a jet pump housing 1, a mainstream pipeline 2, a sucked pipeline 3, an outlet pipeline 4, a working fluid inlet pipeline 5, four guide pipelines 6, a nozzle 7, a mixing chamber 8, a contraction tube 9, a throat 10, a diffuser 11, an adjustable angle connector 12, a slide groove 13 and a set screw 14.

[0038] The jet pump housing 1 is an integral support structure for accommodating all internal components and providing a fluid flow channel. The housing is provided with inner and outer double-layer fluid pipelines to ensure stable fluid flow. Furthermore, the mainstream pipeline 2 is directly connected to the working fluid inlet pipeline 5, with an inner diameter of 25 mm and an area ratio of 6.25, which is used to guide the driving fluid into the nozzle 7. Furthermore, the inner diameter of the nozzle 7 at the connection with the mainstream pipeline 2 is 10 mm, and the throat-to-nozzle distance is designed to be 19.6 mm, which is used to accelerate the high-pressure working fluid to an extremely high speed to form a high-speed jet.

[0039] The working fluid inlet pipe is directly connected to the front end of the four guide pipes, and its inner diameter is 25mm. Further, the four guide pipes 6 are evenly spaced 90° apart, with their front ends connected to the working fluid inlet pipe and their rear ends connected to the mixing chamber, and their inner diameters are all 4mm, which are used to divert part of the high-speed fluid from the working fluid and inject it into the mixing chamber, increase the axial velocity component of the fluid in the mixing chamber, enhance the flow field stability and reduce the vortex phenomenon.

[0040] The mixing chamber 8 is located inside the jet pump housing, has an inner diameter of 55 mm, and a contraction half angle of 20°. The high-speed jet is fully mixed with the sucked fluid in the mixing chamber, and at the same time, the high-speed working fluid is introduced through the four guide pipes 6 to further enhance the axial momentum in the mixing chamber.

[0041] The adjustable range of the angle between the sucked pipe 3 and the working fluid inlet pipe 5 is optimized to 30° to 90°. This design effectively prevents the fluid carrying the particles from directly impacting the wall of the jet pump housing. Through this structure, the wall erosion and wear are reduced, and the velocity component of the sucked fluid in the axial direction is increased. The adjustable angle connector 12 is adjusted and fixed by the slide groove 13 and the set screw 14, and the angle can be flexibly adjusted to optimize the fluid conveying effect under different working conditions. When transporting particles of different particle sizes of the same material, considering the inertial effect in fluid dynamics, smaller particle sizes are suitable for larger angles to reduce flow resistance; while larger particle sizes should choose smaller angles to ensure the stability of the fluid flow field. In this way, the flow field in the mixing chamber can be made smoother and more orderly, thereby optimizing the fluid conveying effect.

[0042] The outlet of the contraction tube 9 is connected to the throat tube 10, the throat tube has an inner diameter of 25 mm and a length of 188.8 mm, and is used to further stabilize the mixed fluid and improve the momentum exchange efficiency.

[0043] The outlet of the throat 10 is directly connected to the inlet of the diffuser 11, and the diffusion half angle of the diffuser is 4°. The velocity of the mixed fluid is gradually reduced through the diffuser, and part of the kinetic energy is converted into static pressure energy, thereby realizing pressurized delivery of the outlet fluid. Further, the outlet pipe is directly connected to the rear end of the diffuser, and the inner diameter is 50 mm.

[0044] The circulating particles are quartz sand particles, the average volume concentration of the particles is 0.1%, and the particle size is 1 mm. This parameter setting is based on the particle conveying requirements in actual working conditions. Quartz sand particles are representative and suitable for verifying the anti-erosion performance of the jet pump under different particle size conditions.

[0045] The specific implementation process is as follows:

[0046] The high-speed working fluid enters the mainstream pipe 2 through the working fluid inlet pipe 5, and most of the working fluid forms a high-speed jet through the nozzle 7. According to Bernoulli's theorem, the increase in flow rate leads to a decrease in pressure. Therefore, a low-pressure area is formed at the outlet of the nozzle 7. The low-pressure area causes the surrounding medium to be sucked into the jet pump, and is mutually entrained with the high-speed fluid, and is fully mixed with the sucked fluid in the mixing chamber 8. A small part of the working fluid enters the mixing chamber 8 through the four guide pipes 6, which enhances the axial momentum of the fluid in the mixing chamber, improves the smoothness of the fluid flow and the streamline stability, significantly reduces the probability of eddy and turbulent phenomena in the mixing chamber, and reduces the flow resistance. The sucked fluid enters from the sucked pipe 3 with the adjusted angle, avoiding the sucked fluid carrying particles from directly impacting the inner wall surface, and flows to the throat 10 after completing momentum exchange with the high-speed working fluid in the mixing chamber 8. Finally, the mixed fluid converts kinetic energy into static pressure energy through the diffuser 11 and is discharged from the outlet pipe 4 to achieve efficient transportation.

[0047] Through the optimized design of the diversion pipe and the suction pipe, the erosion and wear of the pump wall is significantly reduced, and the service life of the equipment is extended. The structure is simple and compact, the flow field is highly stable, and the operating energy consumption is effectively reduced, and the fluid delivery efficiency is improved. Through the above description, the improvements in the jet pump structure and flow field design of the present invention can be widely used in complex working conditions such as oil and gas well exploitation and silt dredging, and have significant practical value.

[0048] It should be understood that although this specification is described according to embodiments, the embodiments do not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0049] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A jet pump with adjustable inlet angle suitable for conveying particles of various particle sizes, characterized in that: The invention comprises a jet pump housing (1), a main flow pipeline (2), a suction pipeline (3), an outlet pipeline (4) and an adjustable angle connector (12); the jet pump housing (1) is provided with inner and outer double-layer fluid pipelines, including a nozzle (7), a mixing chamber (8), a throat (10) and a diffuser (11); the outlet of the mixing chamber (8) is connected to the inlet of the throat (10), and the outlet of the throat (10) is connected to the inlet of the diffuser (11); the main flow pipeline (2) comprises a working fluid inlet pipeline (5) and four diversion pipelines (11) evenly spaced at 90°. 6), the guide pipe (6) is connected to the working fluid inlet pipe (5) and the jet pump housing (1); the sucked pipe (3) is connected to the jet pump housing (1) via an adjustable angle connector (12), the adjustable angle connector (12) comprises a slide groove (13) and a set screw (14), the angle of which can be adjusted and fixed within a range of 30° to 90°, and a bellows (15) is provided above the sucked pipe (3) for achieving flexible adjustment of the angle and ensuring stability, thereby reducing direct impact of the sucked fluid on the inner wall of the jet pump housing (1).

2. The jet pump structure according to claim 1, characterized in that: The working fluid inlet pipe (5) has an inner diameter of 25 mm and an area ratio of 6.25, and is used to guide the driving fluid into the nozzle (7).

3. The jet pump structure according to claim 1, characterized in that: The four flow guide pipes (6) all have an inner diameter of 4 mm and are evenly spaced at 90° intervals, and are used to divert part of the high-speed working fluid and inject it into the mixing chamber (8) to increase the axial velocity component of the fluid in the mixing chamber.

4. The jet pump structure according to claim 1, characterized in that: The mixing chamber (8) has an inner diameter of 55 mm and a contraction half angle of 20°, and is used to achieve full mixing of the sucked fluid and the working fluid.

5. The jet pump structure according to claim 1, characterized in that: The surface of the slide groove (13) of the adjustable angle connector (12) is provided with anti-slip patterns and scale marks, so as to provide a visual reference for angle adjustment and enhance fixing stability.

6. The jet pump structure according to claim 1, characterized in that: The throat (10) has an inner diameter of 25 mm and a length of 188.8 mm, and is used to stabilize the mixed fluid and improve momentum exchange efficiency.

7. The jet pump structure according to claim 1, characterized in that: The diffusion half angle of the diffusion tube (11) is 4°, and is used to gradually reduce the speed of the mixed fluid and convert part of the kinetic energy into static pressure energy, so as to improve the fluid transportation efficiency.

8. The jet pump structure according to claim 1, characterized in that: The circulating particles are quartz sand particles, the average volume concentration of the particles is 0.1%, and the particle size is 1 mm.

Images