Hydraulic adjustable jet pump structural design

Abstract

The invention relates to structural design of a hydraulic adjustable jet pump. The hydraulic adjustable jet pump comprises a jet pump body, an adjustable mechanism, namely a hydraulic cylinder and a sealing mechanism. According to the jet pump, on the basis of a conventional jet pump, reciprocating motion of a nozzle is achieved through motion of a piston rod by means of the working principle of an adjustable mechanism-hydraulic cylinder, so that the pressure ratio and the flow ratio of the jet pump are changed, and the jet pump can adapt to changes of various operation conditions. When the hydraulic cylinder is in a starting acceleration stage, oil enters the hydraulic cylinder from the inlet to push the piston to move rightwards; when the jet pump is in a feeding stage, the piston moves rightwards at a constant speed, so that the nozzle gets close to the throat pipe at a constant speed, and the flow ratio and the pressure ratio in the jet pump are changed in the process; when the nozzle moves to a proper position according to different working condition requirements, after the nozzle completes work, the hydraulic cylinder is in a braking stage, the piston rod begins to move leftwards at a constant speed and then is decelerated to return to an initial position, and the working cycle is completed. The problems that a jet pump in the prior art is small in application range and cannot be flexibly applied in complex working conditions are solved.

Description

Technical Field

[0001] The invention relates to the technical field of fluid machinery, and in particular to a hydraulically adjustable jet pump structure design. Background Art

[0002] In many industrial fields, especially in oil and gas surface engineering, chemical industry, water treatment and other industries, fluid transportation and pressurization is an important technical requirement. Traditional fluid transportation equipment and pressurization equipment often face various challenges, such as difficulty in achieving efficient energy conversion and flexible flow regulation under different working conditions.

[0003] In oil and gas surface engineering, due to the significant differences in formation energy between different production wells, the pressure and flow of each well manifold are also different. Therefore, a fluid delivery and pressurization device that can be flexibly adjusted according to actual working conditions is needed.

[0004] As a fluid delivery and energy conversion device, the jet pump has the advantages of simple structure, no moving parts, good sealing performance, and self-priming. It has been widely used in many industries such as hydropower, agriculture, animal husbandry, fishery, and environmental protection. However, the traditional jet pump usually adopts a fixed structure, and its key parameters such as nozzle size, throat size, and throat-to-mouth distance cannot be adjusted after the design is completed. In practical applications, this fixed design enables the jet pump to achieve optimal performance only under specific working conditions, and its performance will be seriously affected when the working conditions change. For example, the Chinese utility model patent with patent application number CN202321837979.9 discloses a jet pump. When the jet pump is working, the high-pressure fluid flows through the impeller, driving the impeller to rotate, and the impeller rotates to generate negative pressure, sucking and accelerating the low-pressure liquid outside the high-pressure nozzle, and the low-pressure liquid enters the mixing chamber together with the high-pressure fluid, further exchanging kinetic energy and momentum, and then ejecting from the jet port together. However, this patent will generate large noise and energy consumption when working, and the jet pressure cannot be adjusted according to different working conditions. Summary of the invention

[0005] In view of this, it is necessary to provide a hydraulically adjustable jet pump structure design to solve the problem in the prior art that the jet pump cannot make timely changes to ensure adaptation to working conditions when the working fluid changes.

[0006] The present invention provides a hydraulic adjustable jet pump structure design, including a jet pump body, an adjustable mechanism-hydraulic cylinder and a sealing mechanism, wherein the adjustable mechanism-hydraulic cylinder comprises a hose, a hose joint, a nozzle inlet section, a cylinder cover, a piston, a cylinder barrel and a piston rod, wherein the hose is connected to the piston rod and the cylinder cover via the hose joint, the cylinder barrel is connected to the piston, the piston is connected to the piston rod, and the piston rod is connected to the nozzle inlet section, so as to realize the reciprocating motion of the nozzle by the movement of the piston rod using the hydraulic cylinder principle; the jet pump body comprises a mixing chamber and a diffusion chamber, a receiving chamber, a nozzle and a nozzle inlet The inlet and outlet ends of the mixing chamber and the diffusion chamber are connected, and the outlet end points to the position where work is required. It is connected to the receiving chamber through screws, and the receiving chamber is connected to the cylinder and the nozzle inlet section. The inlet and outlet ends of the nozzle are connected, and the outlet end points to the inlet end of the mixing chamber and the diffusion chamber. The inlet end is connected to the nozzle inlet section, and different flow ratios and pressure ratios of the nozzle at different positions are used to cope with different working conditions; the sealing mechanism includes a groove at the external flange, a static seal of the boss and the gasket, and a dynamic seal of the O-ring at the nozzle inlet section and the piston rod and the retaining rings on both sides.

[0007] Furthermore, the jet pump has structures such as nozzles, throats, and diffusers. The nozzle adopts a short conical design, and the inner diameter of the inlet is the same as the fluid inlet pipe. A straight pipe section equal to the distance between the throat and the nozzle is set at the critical point. The inlet straight pipe section is threadedly connected to the inlet section for easy replacement. The suction chamber is conical, the throat is a long cylindrical shape, and the inner diameter of the diffuser gradually expands. The size of each component is calculated and determined according to specific working conditions to ensure efficient fluid transportation and energy conversion.

[0008] Furthermore, the inner diameter of the nozzle outlet end is less than 3 mm.

[0009] Furthermore, the throat is designed with a conical chamfer; the edge thickness of the nozzle outlet pump body should match the throat-nozzle distance, which is set to 5.96 mm to reduce the energy loss of the mixed fluid in the jet pump.

[0010] Furthermore, the diffuser angle is set to 6°, and the diffuser length is set to 111.34 mm, so as to reduce the energy loss of the mixed liquid in the diffuser.

[0011] Furthermore, the main component of the adjustable mechanism is a hydraulic cylinder, which adopts a single piston rod cylinder structure, including a cylinder barrel, a piston, a piston rod and a sealing device. The cylinder barrel is flange-connected to the jet pump suction chamber, and its inner diameter is selected according to the load and working pressure to ensure that it can withstand the hydraulic oil pressure and provide a stable motion track for the piston.

[0012] Furthermore, since the hydraulic cylinder and the suction chamber are integrally sealed in this design, the entry of the jet pump working fluid must be considered at this time. Therefore, the piston rod is designed to be hollow, the rear end is threadedly connected to the nozzle inlet section, and the front end is connected to the working fluid input pipe, so that the working fluid can enter the nozzle through the piston rod. The diameter is determined according to the force conditions to ensure that the strength and rigidity meet the requirements when subjected to various forces.

[0013] Furthermore, the structure of the piston is related to the sealing form, and this paper selects the structure of the sealing ring piston. The O-ring is usually made of oil-resistant rubber material, with a circular cross-section, has a good sealing effect, and can achieve sealing on the end face and the inside and outside.

[0014] Furthermore, the cylinder barrel and the cylinder head are connected by flanges, which is simple in structure, easy to process, and easy to load and unload. The working fluid of the hydraulic cylinder enters from the cylinder head, so an oil inlet is designed on the cylinder head and connected to the oil inlet pipeline.

[0015] Furthermore, in order to achieve the adjustability of the nozzle, the nozzle inlet section needs to move back and forth between the two cavities. The liquid in the two cavities is easy to leak through the gap at the flange connection with the movement of the inlet section, thus causing liquid mixing. At the same time, in order to facilitate the entry of the working fluid of the jet pump, a hose connector is used at the piston rod to connect with the hose, and the working fluid enters from the hose. When the piston rod moves, the hose will also move at the cylinder head outlet, and the oil in the hydraulic cylinder is easy to flow out from the gap. Therefore, dynamic seal design is required at both locations.

[0015] Furthermore, in terms of sealing design, grooves, bosses and gaskets are arranged at the external flange connection to achieve static sealing; O-rings are used at the nozzle inlet section and the piston rod for dynamic sealing, and a suitable compression rate is selected according to the sealing type, and polytetrafluoroethylene retaining rings are arranged on both sides of the O-rings to prevent them from being damaged under high pressure, thereby ensuring that the entire device operates stably under high pressure and preventing liquid leakage from affecting working performance.

[0016] Furthermore, the hydraulic control system includes hydraulic source, actuator, control unit, auxiliary components and working medium. It provides stable hydraulic power according to the system working conditions to meet the pressure and flow requirements of different working stages. The actuator hydraulic cylinder realizes the reciprocating motion of the piston rod under the drive of hydraulic oil, driving the nozzle to adjust the position.

[0017] Furthermore, auxiliary components such as the oil tank are selected with a capacity of 48L to meet the functions of oil storage, impurity precipitation, and oil temperature cooling; the filter adopts a deep filter to effectively filter pollutants, ensure the cleanliness of the hydraulic oil, and prevent component wear and system failure. The components work together to achieve precise control and efficient operation of the jet pump.

[0018] Compared with the prior art, the purpose of the present invention is to provide a hydraulically adjustable jet pump, which realizes the reciprocating motion of the nozzle through hydraulic drive, thereby changing the pressure ratio and flow ratio of the jet pump, so that it can adapt to various operating conditions, improve energy utilization efficiency and reduce production energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention provides an overall structural schematic diagram for the structural design of a hydraulically adjustable jet pump.

[0020] Figure 2 A stereoscopic diagram of the structural design of a hydraulically adjustable jet pump provided by the present invention.

[0021] Figure 3 A schematic diagram of the structure of the nozzle in one embodiment of the structural design of a hydraulically adjustable jet pump provided by the present invention.

[0022] Figure 4 A schematic structural diagram of a nozzle inlet section in one embodiment of the structural design of a hydraulically adjustable jet pump provided by the present invention.

[0023] Figure 5 A schematic diagram of the structure of a receiving chamber in one embodiment of the structural design of a hydraulically adjustable jet pump provided by the present invention.

[0024] Figure 6 A schematic diagram of the structure of a mixing chamber and a diffusion chamber in one embodiment of the structural design of a hydraulically adjustable jet pump provided by the present invention.

[0025] Figure 7 A schematic diagram of the structure of a cylinder barrel in an embodiment of the hydraulic adjustable jet pump structure design provided by the present invention

[0026] Figure 8 A schematic diagram of the structure of a piston rod in one embodiment of the structural design of a hydraulically adjustable jet pump provided by the present invention.

[0027] Fig. 9 A schematic diagram of the structure of a piston in an embodiment of the structural design of a hydraulically adjustable jet pump provided by the present invention.

[0028] Fig.10 A schematic diagram of the structure of a cylinder head in one embodiment of the structural design of a hydraulically adjustable jet pump provided by the present invention.

[0029] In the figure: 1. adjustable mechanism - hydraulic cylinder; 2. jet pump body; 11. hose; 12. cylinder head; 13. cylinder barrel; 14. hose connector; 15. piston; 16. piston rod; 17. nozzle inlet section; 21. receiving chamber; 22. nozzle; 23. mixing chamber and diffusion chamber; 231. throat; 232. diffuser. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0031] A hydraulic adjustable jet pump structure design includes an adjustable mechanism - a hydraulic cylinder 1 and a jet pump body 2. The adjustable mechanism - the hydraulic cylinder 1 includes a hose 11, a cylinder head 12, a cylinder barrel 13, a hose joint 14, a piston 15, a piston rod 16, and a nozzle inlet section 17. The hose 11 is connected to the piston rod 16 and to the cylinder head 12 via the hose joint 14, the cylinder barrel 13 is connected to the piston 15, the piston 15 is connected to the piston rod 16, and the piston rod 16 is connected to the nozzle inlet section 17, so that the reciprocating motion of the nozzle 22 is realized by the movement of the piston rod 16 using the principle of the hydraulic cylinder.

[0032] The jet pump body 2 includes a receiving chamber 21, a nozzle 22, a mixing chamber and a diffusion chamber 23. The inlet and outlet ends of the mixing chamber and the diffusion chamber 23 are connected and the outlet end points to the position where work is required. It is connected to the receiving chamber 21 by screws. The receiving chamber 21 is connected to the cylinder 13 and the nozzle inlet section 17. The inlet and outlet ends of the nozzle 22 are connected and the outlet end points to the inlet end of the mixing chamber and the diffusion chamber 23. The inlet end of the mixing chamber and the diffusion chamber 23 is connected to the nozzle inlet section 17. The different flow ratios and pressure ratios of the nozzle 22 at different positions are used to cope with different working conditions.

[0033] In this embodiment, there is also a sealing design, including static sealing of the groove, boss and gasket at the external flange, and dynamic sealing of the O-ring and retaining rings at the nozzle inlet section 17 and the piston rod 16. The groove, boss and gasket are arranged at the connection of the external flange to achieve static sealing; the O-ring is used for dynamic sealing at the nozzle inlet section 17 and the piston rod 16, and the appropriate compression rate is selected according to the sealing type, and polytetrafluoroethylene retaining rings are arranged on both sides of the O-ring to prevent it from being damaged under high pressure, so as to ensure the stable operation of the entire device under high pressure environment and avoid liquid leakage affecting the working performance.

[0034] Among them, considering the sealing problem of the adjustable mechanism-hydraulic cylinder 1, the cylinder barrel 13 is directly connected to the receiving chamber 21 of the jet pump body 2, and the connection method is flange connection. Since the liquid may leak from the gap at the flange connection, a boss is set on the flange disc of the cylinder barrel, so as to correspond to the groove on the flange disc of the receiving chamber in the jet pump. The piston rod 16 is designed to be hollow to facilitate the entry of the working fluid of the jet pump. The rear end is directly threaded with the nozzle inlet section 17, which facilitates the working fluid of the jet pump to enter the nozzle inlet section 16 through the piston rod 16. The front end of the piston rod 16 is connected to the input pipeline of the working fluid of the jet pump. And the present invention selects the structural form of the sealing ring piston. The O-type sealing ring is usually made of oil-resistant rubber material, and its cross section is circular, has a good sealing effect, and can achieve sealing on the end face and the inner and outer sides. The cylinder barrel 13 is connected to the cylinder head 12 by flanges, so that the design structure is simple, easy to process, and easy to load and unload. The working fluid of the adjustable mechanism-hydraulic cylinder 1 enters from the cylinder head 12, so an oil inlet is designed in the cylinder head 12 and is connected to the oil inlet pipe through threads.

[0035] Among them, there are structures such as nozzle 22, throat 231, and diffuser 232 in the jet pump body 2. The nozzle 22 adopts a short cone design, and the inner diameter of the inlet is the same as the fluid inlet pipeline. A straight pipe section equal to the throat-nozzle distance is set at the critical point, and the inlet straight pipe section is threadedly connected to the inlet section for easy replacement. The throat 231 is a long cylindrical shape, and the inner diameter of the diffuser 232 gradually expands. The size of each component is determined based on specific working conditions to ensure efficient fluid transportation and energy conversion. The throat 231 is designed with a conical chamfer; the thickness of the nozzle 22 outlet pump body edge should match the throat-nozzle distance, and the throat-nozzle distance is set to 5.96mm to reduce the energy loss of the mixed fluid in the jet pump body 2, the diffuser 232 angle is set to 6°, and the diffuser 232 length is set to 111.34mm to reduce the energy loss of the mixed liquid in the diffuser 232.

[0036] The working principle of the jet pump body 2 is as follows: the high-pressure fluid is accelerated inside the nozzle 22, and the kinetic energy increases while the pressure decreases, thereby forming a negative pressure area at the outlet of the nozzle 22. The negative pressure area attracts the liquid into the receiving chamber 21, and then mixes with the power fluid in the throat 231 and exchanges energy to form a new homogeneous fluid. Through the diffuser 232, the pressure of the fluid is recovered and the kinetic energy is reduced, thereby achieving effective lifting of the fluid. Through this series of processes, the jet pump body 2 completes its operating cycle.

[0037] In order to realize the overall assembly of the hydraulic adjustable jet pump, the adjustable mechanism-hydraulic cylinder 1 and the jet pump body 2 are assembled together in a flange connection manner, the channel of the working fluid of the jet pump body 2 passes through the adjustable mechanism-hydraulic cylinder 1, and the left end of the piston rod 16 is connected to the liquid inlet pipe of the working fluid of the jet pump body 2. Liquid leakage is prone to occur at the hydraulic cylinder head when the pipeline enters and exits, so a packing seal is also used. When the adjustable mechanism-hydraulic cylinder 1 is working, the piston rod 16 performs reciprocating linear motion, and the nozzle inlet section connected to the piston rod 16 will also perform reciprocating linear motion with the nozzle, thereby realizing the adjustment of the throat-mouth distance.

[0038] The working process of the present invention is as follows: hydraulic oil is continuously supplied to the chamber on the left side of the adjustable mechanism-hydraulic cylinder 1. When the oil pressure reaches a level that can counteract the entire load on the piston rod 16, the piston 15 will begin to move to the right at a stable speed, thereby driving the piston rod 16 to move to the right. The piston rod 16 is connected to the nozzle inlet section 17, and finally drives the nozzle 22 to move forward. When it moves to a certain distance from the throat 231, the piston 15 stops moving, and the working fluid is ejected from the nozzle 22 at a high speed; conversely, when hydraulic oil is input into the right chamber of the adjustable mechanism-hydraulic cylinder 1, the piston 15 moves continuously to the left, and the piston rod 16 drives the nozzle 22 to move backward. In this way, the forward and backward reciprocating motion of the adjustable nozzle 22 is realized.

[0039] The movement process of the present invention is as follows: when the adjustable mechanism-hydraulic cylinder 1 is in the starting acceleration stage, the oil enters the adjustable mechanism-hydraulic cylinder 1 from the inlet, pushing the piston 15 to move to the right; when it is in the working stage, the piston 15 moves to the right at a uniform speed, thereby making the nozzle 22 approach the throat 231 at a uniform speed. During this process, the flow ratio and pressure ratio in the jet pump body 2 change; when the nozzle 22 moves to a suitable position according to different working conditions, after the nozzle 22 completes the work, the adjustable mechanism-hydraulic cylinder 1 is in the braking stage, the piston rod 16 starts to move to the left at a uniform speed, and then decelerates to return to the starting position, and the working cycle is completed.

[0040] The hydraulic control system of the present invention is composed of multiple core parts, including a hydraulic source, an actuator, a control unit, auxiliary components and a working medium. The hydraulic source part is mainly composed of a hydraulic pump, which is used to provide and adjust the hydraulic power required by the system and ensure the supply of hydraulic oil to drive the entire system. Actuators, such as hydraulic cylinders and hydraulic motors, are responsible for converting the pressure energy of the hydraulic oil into mechanical energy to realize the movement of moving parts. The control unit is responsible for monitoring and adjusting the working state of the hydraulic system, including parameters such as pressure, flow and flow direction. Auxiliary components, such as oil tanks, filters and pipelines, ensure the reliability, stability and durability of the system operation.

[0041] The auxiliary components required by the present invention, such as the oil tank, have a capacity of 48L to meet the functions of oil storage, impurity precipitation, and oil temperature cooling; the filter adopts a deep filter to effectively filter pollutants, ensure the cleanliness of the hydraulic oil, and prevent component wear and system failure. The components work together to achieve precise control and efficient operation of the jet pump.

Claims

1. A hydraulically adjustable jet pump structure design, characterized in that: It includes a jet pump body, an adjustable mechanism-hydraulic cylinder and a sealing mechanism; The adjustable mechanism-hydraulic cylinder comprises a hose, a hose joint, a nozzle inlet section, a cylinder cover, a piston, a cylinder barrel, and a piston rod. The hose is connected to the piston rod through the hose joint, and the hose is connected to the cylinder cover, the cylinder barrel is connected to the piston, the piston is connected to the piston rod, and the piston rod is connected to the nozzle inlet section, so that the reciprocating motion of the nozzle is realized by the movement of the piston rod using the working principle of the hydraulic cylinder; The jet pump body includes a mixing chamber and a diffusion chamber, a receiving chamber, a nozzle, and a nozzle inlet section. The mixing chamber and the diffusion chamber have an inlet end and an outlet end, the inlet end is connected to the outlet end, and the outlet end points to the position to be processed. The mixing chamber and the diffusion chamber are connected to the receiving chamber through screws, the receiving chamber is connected to the cylinder, the receiving chamber is connected to the cylinder and the nozzle inlet section, the nozzle inlet section is connected to the nozzle, the nozzle has an inlet end and an outlet end, the inlet end is connected to the outlet end, the outlet end points to the inlet end of the mixing chamber and the diffusion chamber, the inlet end is connected to the nozzle inlet section, and different flow ratios and pressure ratios exist when the nozzle moves to different positions to cope with different working conditions; The sealing mechanism includes static sealing of grooves, bosses and gaskets at the external flange connection, and dynamic sealing of O-rings and retaining rings on both sides of the O-rings at the nozzle inlet section and the piston rod.

2. The hydraulically adjustable jet pump according to claim 1, characterized in that: The material of the nozzle is hard alloy, and the inlet straight pipe section of the nozzle is threadedly connected with the inlet section.

3. The hydraulic adjustable jet pump structure design according to claim 1 is characterized in that: The nozzle is a short conical structure, one end of the nozzle is the outlet end, and the other end is connected to the nozzle inlet section. The cross section of the nozzle gradually expands in the direction from the outlet end to the nozzle inlet section.

4. The hydraulically adjustable jet pump according to claim 1, characterized in that: The inner diameter of the cylinder is selected according to the load and the working pressure, providing a stable movement track for the piston while bearing the hydraulic oil pressure.

5. The hydraulic adjustable jet pump structure design according to claim 3 is characterized in that: The inner diameter of the nozzle outlet end is less than 3 mm.

6. A hydraulic control system for controlling the hydraulically adjustable jet pump as claimed in claim 1, characterized in that: It includes a hydraulic pump, a motor, an actuator, a control unit, and auxiliary components. The hydraulic pump and the motor provide power for the system. The actuator is the hydraulic cylinder of the hydraulic adjustable jet pump, which drives the piston rod to move back and forth through hydraulic oil, thereby driving the nozzle to move. The control unit is used to monitor and adjust the pressure, flow rate, and flow direction of the hydraulic system. The auxiliary components include an oil tank and a filter. The oil tank capacity is 48L, and the filter is a depth filter.

7. A hydraulically adjustable jet pump structure design, characterized in that: The method is completed by the hydraulic adjustable jet pump structure design according to any one of claims 1 to 6, and comprises the following steps: S1: The oil enters the cylinder through the hose and pushes the piston to move to the right; S2: When in the working stage, the piston moves rightward at a constant speed, so that the nozzle moves toward the mixing chamber and the diffusion chamber at a constant speed. In this process, the flow ratio and pressure ratio in the jet pump change; S3: When the nozzle moves to a suitable position according to different working conditions, after the nozzle completes its work, the adjustable mechanism - hydraulic cylinder is in the braking stage, the piston rod starts to move to the left at a constant speed, then slows down and returns to the starting position, and the working cycle is completed.

8. The hydraulic control system according to claim 6, characterized in that: The control unit can make the working cycle of the hydraulic adjustable jet pump be "fast forward-working forward-fast reverse-in-situ stop".

9. The hydraulic control system according to claim 6, characterized in that: The filter can effectively filter pollutants, ensure the cleanliness of hydraulic oil, and prevent component wear and system failure.

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