阅读说明：本技术 一种水锤发生装置 (Water hammer generating device ) 是由 陈李斌 尚德彬 高继峰 王利畏 胡纪军 仝淑月 银永明 崔小辉 路浩 魏文杰 邢 于 2020-05-08 设计创作，主要内容包括：本发明公开了一种水锤发生装置,包括电液压脉冲发生装置、自激振荡腔室、球罐体和橡胶囊；电液压脉冲发生装置喷口与自激振荡腔室入口连通；自激振荡腔室喷口与球罐体上部中间位置连通；橡胶囊套设在球罐内；球罐体内壁与橡胶囊外部之间形成了缓冲腔；缓冲腔内填充有液体；橡胶囊呈椭圆形；橡胶囊两端与输气管道直贯通；自激振荡腔室内部形状类似于倒漏斗形；自激振荡腔室对称设置；自激振荡腔室与球罐体上部中间位置连通通道口呈喇叭口状；自激振荡腔室的中轴线与整个装置的中轴线重合；喇叭口状通道口边缘与中轴线之间呈25度夹角。本发明无运动部件,体积小巧,结构紧凑,工作高效、可靠,造价低,易安装,易更换适于推广使用。(The invention discloses a water hammer generating device, which comprises an electro-hydraulic pulse generating device, a self-oscillation chamber, a ball tank body and a rubber bag, wherein the electro-hydraulic pulse generating device comprises a hydraulic pump, a hydraulic pump and a hydraulic pump; the nozzle of the electro-hydraulic pulse generating device is communicated with the inlet of the self-oscillation chamber; the self-oscillation chamber nozzle is communicated with the middle position of the upper part of the spherical tank body; the rubber bag is sleeved in the ball tank; a buffer cavity is formed between the inner wall of the spherical tank body and the outside of the rubber bag; liquid is filled in the buffer cavity; the rubber bag is in an oval shape; two ends of the rubber bag are directly communicated with the gas pipeline; the internal shape of the self-oscillation chamber is similar to an inverted funnel shape; the self-excited oscillation chambers are symmetrically arranged; the self-oscillation chamber is communicated with a passage opening at the middle position of the upper part of the spherical tank body to form a bell mouth shape; the central axis of the self-oscillation chamber is superposed with the central axis of the whole device; the edge of the bell-mouth-shaped channel opening forms an included angle of 25 degrees with the central axis. The invention has the advantages of no moving part, small volume, compact structure, high efficiency and reliability in work, low manufacturing cost, easy installation, easy replacement and suitability for popularization and use.)

1. A water hammer generating device is characterized by comprising an electro-hydraulic pulse generating device, a self-oscillation chamber, a ball tank body and a rubber bag; the nozzle of the electro-hydraulic pulse generating device is communicated with the inlet of the self-oscillation chamber; the self-oscillation chamber nozzle is communicated with the middle position of the upper part of the spherical tank body; the rubber bag is sleeved in the ball tank; a buffer cavity is formed between the inner wall of the spherical tank body and the outer part of the rubber bag; the buffer cavity is filled with liquid; the rubber bag is oval; two ends of the rubber bag are directly communicated with the gas pipeline; the internal shape of the self-oscillation chamber is similar to an inverted funnel shape; the self-oscillation chambers are symmetrically arranged; the self-oscillation chamber is communicated with a channel opening in the middle of the upper part of the spherical tank body to form a bell mouth shape; the central axis of the self-oscillation chamber is superposed with the central axis of the whole device; and an included angle of 25 degrees is formed between the edge of the horn-mouth-shaped channel opening and the central axis.

2. The water hammer generating device of claim 1, wherein the electro-hydraulic pulse generating device comprises an electro-hydraulic pulse generator, a working chamber, an electrode, and a nozzle; the electro-hydraulic pulse generating device is roughly in an ellipsoid shape, the electrodes comprise positive electrodes and negative electrodes which are oppositely arranged, and the symmetrical points of the positive electrodes and the negative electrodes are at the first focus position at the upper part in the ellipsoid.

3. A water hammer generating device according to claim 1 or 2, wherein the self-oscillating chamber is an axially symmetric multi-segment chamber with different radii of curvature.

4. A water hammer generating device according to claim 3, wherein the rubber bladder is coaxial with the gas transmission conduit.

5. The water hammer generating device according to claim 1, 2 or 4, wherein the liquid filled in the buffer chamber is water.

6. The water hammer generating device of claim 5, wherein the volume of the rubber bladder is less than or equal to 1/3 times the volume of the ball canister.

7. The water hammer generating device according to claim 1, 2 or 6, wherein the outer surface of the rubber bladder is rugged.

8. The water hammer generating device according to claim 7, wherein the capsule-like outer surface is irregularly provided with protrusions and depressions.

9. A water hammer generating device according to claim 1, 2, 6 or 8, wherein the surface of the rubber bladder is arranged in a wave-like configuration.

10. The water hammer generating device according to claim 9, wherein the maximum diameter of the exponential curve of the self-oscillating chamber is 3 times the diameter of the inlet thereof; the inlet surface roughness Ra of the self-oscillation chamber is less than or equal to 0.8; the surface roughness Ra of the curved rotating surface in the self-oscillation cavity is less than or equal to 0.8; the outlet surface roughness Ra of the self-oscillation chamber is less than or equal to 0.8; the positioning matching precision of the annular surface of the nozzle at the lower end of the rotating ellipsoid electrode working cavity and the annular surface of the inlet of the self-oscillation cavity is H6/H5; the positioning fit precision of the outer arc surface of the self-oscillation cavity outlet and the arc surface of the spherical tank body is H6/H5.

Technical Field

The invention relates to the technical field of oil and gas equipment, in particular to a water hammer generating device.

Background

In the process of fluid delivery, when the opened valve is suddenly closed or the water pump is suddenly stopped, the subsequent water flow can continuously flow into the delivery pipeline under the inertia effect, so that the water pressure in the delivery pipeline can be suddenly increased to form a water hammer, and the effect is the water hammer effect. The definition of water hammer in textbooks is that the water hammer refers to a phenomenon that large pressure fluctuation is caused and vibration is caused due to the rapid change of fluid flow in a closed pipeline system (including a pump). The water hammer energy is huge, and the current devices capable of utilizing the water hammer energy are not many. The research on the water hammer effect so far mostly aims at overcoming the destructive effect generated by the water hammer effect, but ignores the huge energy caused by the water hammer effect, and if the energy can be fully applied to oil and gas transmission pipeline systems or other fields, the great value can be generated. In addition to overcoming the destructive effect caused by the water hammer effect, the exploration of how the water hammer effect brings energy has been focused, which not only saves energy, but also avoids the environmental pollution problem caused by other energy consumption. For example, chinese patent publication No. CN104632511A discloses a device for generating kinetic energy by using energy of water hammer effect, which provides a device for generating kinetic energy by using energy of water hammer effect, and converts huge energy brought by water hammer effect into continuous kinetic energy for output, and is used in power generation or other fields. However, the place where the water hammer effect occurs in the technical scheme is the pressure bin between the shell and the transmission wheel, so that a large part of work done by the water hammer effect occurs on other parts such as the inner wall of the pressure bin and the like, namely, the work done by the water hammer effect cannot be converted into kinetic energy of the rotating wheel to be output, and the work doing efficiency is low. The device for generating kinetic energy by enhancing the water hammer effect (CN107084086A) has the advantages that the water hammer effect is generated in the through hole on the driving wheel, the water hammer effect does work mainly on the driving wheel, and the output kinetic energy is larger. Therefore, how to utilize the water hammer energy is a technical problem which needs to be solved currently by the technical personnel in the field.

The water hammer phenomenon occurs when the fluid flow of the pipeline system changes, and in order to solve the water hammer phenomenon, a water hammer eliminating device needs to be installed in the pipeline. However, most of the existing water hammer protection devices utilize the arranged air bags as buffering and eliminating devices, some devices need to arrange an air valve at a high point of a pipeline, pressure balance is adjusted by air inlet or air outlet, equipment is precise, and faults are easy to occur. Some need establish the atmospheric pressure jar and adjust the water balance, equipment is bulky, still need time inflation from time to time, and present water hammer annihilator body is mostly the integral type design, if damage just scrapping need be renewed with high costs. Such as "water hammer resistant water flow pressurizing device" (CN 210219039U); sediment is easy to settle in the fluid pipeline, scale is easy to block the pipeline, the attachments are removed by utilizing wave energy, the drag reduction and the transmission increase are realized, and a water hammer generator is required to be installed in the pipeline. The water hammer eliminator and the water hammer generator are devices responding to the water hammer problem, and although the water hammer eliminator and the water hammer generator have the same structural form or structural characteristics, the effects, the purposes and the technical routes are opposite. At present, the defects of large resistance loss and high energy consumption exist in the long-distance transportation of natural gas and petroleum.

In 1955, the former soviet engineers, yute jin, found that large current pulse liquid discharge could produce huge mechanical effect, and named it as "liquid electric effect" (science press, 1962). The liquid electric effect has a great application prospect in the industrial field, and a large-current pulse generating device is needed for realizing the liquid electric effect. The hydro-electric effect is also called electro-hydraulic pulse, electro-hydraulic hammer, hydro-electric explosion, etc. The hydro-electric effect is the process of instantly converting electric energy into several forms of energy such as heat, light, sound, force and the like when the electric energy is discharged in water. The industrial electricity is charged into a capacitor after being boosted and rectified, stored and put into water, and discharged in the water by controlling an air switch to form explosion. At this time, high pressure of 1000-10 ten thousand atmospheres can appear in the center of explosion, and strong shock waves and high-speed water flow of 100 meters per second are formed. It has been estimated that the power of such pulses can reach up to 100 kilo-kilowatts. Since "hydro-electric explosion" has many peculiar functions and remarkable skills, the technology has been widely used in the fields of industry, construction, medical treatment, ocean development and the like. The discharge electrode is installed in the sealed steel body of the rotating ellipsoid by a cable, the two electrodes are coaxial and horizontally pass through the first focus on the upper part of the rotating ellipsoid, and strong shock waves generated by the two electrodes are used as a power source through pulse discharge. The high-power shock wave is focused at a second focal point, which is the outlet of the high-pressure water jet generated by the discharge working chamber, i.e. the inlet of the self-oscillation chamber. Just the hydro-electric effect technology can convert electric energy into hydraulic mechanical energy instantly, thereby realizing the characteristic of energy conversion and being paid attention and appreciated by people. The technology is characterized in that high-pressure water which is difficult to obtain by a common method can be generated by utilizing the liquid-electric effect through a simpler technical approach. The device has no moving parts, the emission frequency and the energy are easy to adjust, and the device is easy to realize remote and automatic, safe and reliable.

What is called the "hydroelectric effect"? When a pulse high voltage is applied to a pair of electrodes placed in liquid, the electrode gap is instantaneously broken down, strong electrode spark discharge is generated, and a series of remarkable physical, chemical, biological and mechanical effects are associated, so that the process is called a liquid-electricity phenomenon. From the energy conversion point of view, liquid phase discharge is a transient energy conversion process.

FIG. 1 is a circuit diagram of a basic device for generating the hydro-electric effect. When the dc high voltage rises to the value of the breakdown voltage of the auxiliary gap 3, the auxiliary gap 3 discharges first, whereupon the supply voltage suddenly adds to the main gap 2 and causes a discharge to occur therewith. Changing the value of the auxiliary gap 3 makes it possible to regulate the dc supply voltage over a relatively large range, and thus to regulate the discharge current and the intensity of the electric water hammer effect. When the main gap is discharged, an electrohydraulic shock wave will occur in the electrohydraulic effect generating container 1 containing the liquid. It must be pointed out that: to obtain a relatively strong electro-hydraulic effect, the wave head of the current waveform must be made short, or the steepness (di/dt) of the current waveform must be made large. In the limit, if the length of the current wave head is zero (i.e. the gradient is infinite), the time required for the current to rise from zero to the maximum value is zero, and when the current is maximum, the liquid has not yet been vaporized, i.e. the thickness of the "steam cushion" is zero, and meanwhile, because the change of the cross section of the discharge channel is proportional to the value of the flowing current, the speed of the section of the discharge channel in the liquid expanding outwards is infinite, and thus, an extremely strong mechanical effect must be presented. The shock wave generated at this time is outwardly expanded. This shock wave, which is formed by the outward expansion of the discharge channel, is called the main shock, or first hydraulic shock.

After the discharge is stopped, the liquid cavity formed by the discharge channel is closed at the ultrasonic speed to form a second hydraulic shock, or cavity shock, also called gap shock. This shock wave is clearly inside-out and it also causes a great mechanical effect. In order to make the effect of the second hydraulic impact strong, it is clear that the amount of vapor that has formed at this point must be kept to a minimum. For this purpose, it is necessary that the shorter the total wavelength of the discharge current, the better, so that after the discharge has been completed, the liquid still has to be vaporized to some extent. Some circuits produce a current waveform that decreases exponentially from a maximum value, which theoretically takes infinite time to reach a zero value. In order to compare how fast the current tail drops, the so-called tail length is usually used, which refers to the time from the current start to the time when the current drops to 1/2 maximum. Therefore, the smaller the tail length of the current wave, the stronger the second hydraulic shock. In fact, as the current wave tail length decreases, the first hydraulic shock will intensify. To increase the steepness of the wave head of the current and to reduce the wave tail length, it is necessary to make the inductance Z and the resistance R in the discharge circuit as small as possible, and to make the interelectrode capacitance and the conductance of the main gap as small as possible. Therefore, it is necessary to reduce the total length of the discharge circuit and the area surrounded by the discharge circuit as much as possible to generate a strong electric water hammer effect. To summarize the above, the generation of the electrohydraulic effect requires four requirements: auxiliary clearance; a large current amplitude value; high current rising gradient; and fourthly, short wave tail. Only by grasping these four points, the liquid-electric effect can be produced smoothly.

As the name implies, shock waves occur as a result of water hammer generated after electrical discharge occurs in water or liquid. Therefore, it is necessary to investigate the electro-hydraulic effect characteristics of the discharge in the liquid. Generally, liquids can be divided into two main categories from the hydro-electric effect, one being insulating oil or chemically pure water; another class is ionically conductive liquids such as water in general or solutions thereof containing electrolytes. Even the latter type of liquid also exhibits the properties of an insulating liquid, since ions do not move much at all when the latter is broken down by the very steep impulse voltage wave. Both types of liquid can be used to generate the hydro-electric effect. Of course, tap water is only required on the device. Although the discharge in liquid is also the same, the discharge satisfying the four requirements is completely different from the discharge not satisfying the four requirements in the effect. For example, a strong impulse discharge that can break through a 100-150 mm liquid layer under normal conditions does not produce any significant external mechanical effect, but the liquid level fluctuates slightly, so that most of the electric energy in the capacitor becomes thermal energy (in the conducting wires and in the liquid) and electromagnetic radiation energy, and the electric energy rarely becomes mechanical energy. However, after the four conditions are satisfied, although the power of the discharge is smaller than that in the above experiment, the sparks with the same length can lift 10-15L of liquid to a height of several meters, or the strong water tank made of organic glass with the wall thickness of 16mm and the volume of 400L can be smashed. And the sound it makes is much larger than before. It can be seen that the electric energy is directly converted into mechanical energy, the conversion efficiency can reach 30% or 50%, and the detailed calculation formula (not shown) is also applicable to the liquid discharge. In summary, to obtain a very high instantaneous pressure, the total energy of the discharge must be sufficiently large, the head time of the discharge must be short, the duration of the discharge must be short, and the density of the liquid must be high. These requirements are readily met when designing a practical electrohydraulic power plant. Since electrical energy is mainly converted into mechanical energy, the amount of heat generated when the main gap is discharged is small. A specially made reflector may be used in order to concentrate the electrohydraulic effect to a certain area in the liquid. So as to achieve the purpose of "" focusing "" the shock wave.

Disclosure of Invention

The invention aims to design a water hammer generating device which can comprehensively utilize water hammer energy and increase pulse pressure regulation of a pipe conveying system so as to achieve the effect of increasing the conveying, save the manufacturing cost and reduce the cost. A unique pipeline transportation device integrates the characteristics of a water hammer generator and a water hammer eliminator.

According to the inventive concept, the technical scheme provided by the invention is as follows:

a water hammer generating device comprises an electro-hydraulic pulse generating device, a self-oscillation chamber, a ball tank body and a rubber bag; the nozzle of the electro-hydraulic pulse generating device is communicated with the inlet of the self-oscillation chamber; the self-oscillation chamber nozzle is communicated with the middle position of the upper part of the spherical tank body; the rubber bag is sleeved in the ball tank; a buffer cavity is formed between the inner wall of the spherical tank body and the outer part of the rubber bag; the buffer cavity is filled with liquid; the rubber bag is oval; two ends of the rubber bag are directly communicated with the gas pipeline; the internal shape of the self-oscillation chamber is similar to an inverted funnel shape; the self-oscillation chambers are symmetrically arranged; the self-oscillation chamber is communicated with a channel opening in the middle of the upper part of the spherical tank body to form a bell mouth shape; the central axis of the self-oscillation chamber is superposed with the central axis of the whole device; and an included angle of 25 degrees is formed between the edge of the horn-mouth-shaped channel opening and the central axis.

The electro-hydraulic pulse generator comprises an electro-hydraulic pulse generator, a working cavity, an electrode and a nozzle; the electro-hydraulic pulse generating device is roughly in an ellipsoid shape, the electrodes comprise positive electrodes and negative electrodes which are oppositely arranged, and the symmetrical points of the positive electrodes and the negative electrodes are at the first focus position at the upper part in the ellipsoid.

Wherein the self-oscillation chamber is an axially symmetrical chamber with multiple sections of different curvature radiuses.

Further, the rubber bag is coaxial with the gas transmission pipeline.

Further, the liquid filled in the buffer cavity is water.

Further, the volume of the rubber bag is less than or equal to 1/3 of the volume of the ball tank body.

Furthermore, the outer surface of the rubber bag is arranged in an uneven mode.

Further, the outer surface of the capsule is irregularly provided with bulges and pits.

Furthermore, the surface of the rubber bag is arranged in a wave-shaped structure.

The invention has the beneficial effects that: when the device is manufactured, the electric hydraulic pulse generating device, the self-oscillation chamber, the ball tank body and the rubber bag can be manufactured and processed respectively and then assembled together, and the device is simple in structure, so that the processing difficulty and the cost are low, each part is easy to replace, and the use is convenient; particularly, the use of the electro-hydraulic pulse generating device not only ensures that the discharge frequency and the discharge energy are continuously adjustable, but also ensures that the positioning matching precision of the outer surface of the nozzle of the circular ring at the lower end of the rotating ellipsoid electrode working cavity and the outer surface of the circular ring at the inlet of the self-oscillation cavity is realized, so that the central line of the nozzle is collinear with the central line of the self-oscillation cavity; the positioning matching precision of the outer arc surface of the self-oscillation cavity outlet and the arc surface of the spherical tank body ensures that the outlet center line and the self-oscillation cavity center line are collinear, namely the self-oscillation cavity inlet, the self-oscillation cavity and the self-oscillation cavity outlet are collinear. And the adoption of the structure can easily improve the collinear precision of the central lines of the self-oscillation chamber inlet, the self-oscillation chamber and the self-oscillation chamber outlet. Experiments show that the self-oscillation chamber is only provided with the center lines of the self-oscillation chamber inlet, the self-oscillation chamber and the self-oscillation chamber outlet which are collinear, and the generated pulse effect is stronger. In addition, the self-oscillation chamber inlet and the self-oscillation chamber outlet are designed in an equal diameter mode, and the outlet nozzle of the self-oscillation chamber outlet is provided with a conical collision wall, so that oscillation pressure waves are effectively fed back, and the pulse effect is good. According to the invention, the roughness Ra of the inlet hole wall of the self-oscillation chamber, the wall surface of the self-oscillation chamber and the outlet hole wall of the self-oscillation chamber is less than or equal to 0.8, so that not only is the energy loss caused by friction between jet flow and the wall surface reduced, but also the loss in the propagation process of oscillation pressure waves is reduced, and thus the energy of the outlet jet flow is more concentrated, and the pulse effect is better. After the invention is adopted, good pulse effect can still be generated when the pressure is 20 MPa.

The design of the self-excited oscillation chamber can convert high-pressure water jet ejected from the nozzle of the electro-hydraulic pulse generating device into strong speed and pressure 'climbing' type pulse jet: the instantaneous velocity of the outlet water flow is higher, and the amplitude of the outlet pressure can be increased by 10-30%. The novel high-efficiency pulse jet is developed by using the theories of hydrodynamics, fluid resonance, transient flow, hydroacoustics and the like. The self-excited oscillation cavity is a revolving body, the revolving body is provided with an inlet and an outlet, the middle part is an oscillation cavity, and the symmetrical index curved surface inner cavity (the inner contour curve of the revolving body is formed by sequentially and smoothly connecting an inwards concave high-order equation curve and a straight line section) is adopted by the revolving body, and the symmetrical index curved surface inner cavity is a cavity structure with the complexity of a boundary layer theory and a vortex theory, so that the high-pressure water jet can be strengthened and deepened in a pulse mode, is similar to a punched combined punch and is more powerful. Its working principle can be simply described as the liquid flow is accelerated when passing through a narrow nozzle, reaches a symmetrical chamber, is compressed and then expands, rushes out of an inverted funnel-shaped nozzle to reach the speed of sound, which is higher than the speed of the liquid inlet. However, it works very skillfully, like programmed. It utilizes the instability of shear layer produced by impact wave of liquid-electric effect, vorticity disturbance and amplification action of said shear layer instability to disturbance and the principle of feeding back closed loop formed from these three links to produce oscillating pulse jet flow, so that the jet flow possesses pulseThe impact characteristic changes the jet state generated by the traditional continuous jet nozzle, overcomes the characteristic of small continuous energy of the traditional continuous jet nozzle, and effectively improves the instantaneous hitting force and the effective jet distance of jet, namely the target distance. Therefore, the self-oscillation chamber structure adopted by the invention has the advantages of high energy and high instantaneous striking force. The pulse jet energy is E-mCV, wherein m is the working liquid density, C is the sound velocity of the working liquid, and V is the jet outlet velocity), so the energy of the invention is far larger than the continuous energy which can be generated by the existing nozzle; the pulsation of the flow field in the buffer cavity caused by the continuous jet flow is smaller and only E₀＝1/2mV(E₀M is the working fluid density and V is the jet outlet velocity) affecting the energy absorption efficiency and efficiency output of the rubber bladder, and the self-oscillating chamber can effectively improve the defects caused by continuous water jet. It can transform a continuous jet into an oscillating pulsed water jet. The working efficiency of the jet flow is improved, and the energy-saving effect is achieved. And the higher the pressure, the better the effect. The device is particularly suitable for being applied to jet flow generated by an electro-hydraulic pulse generating device. The chamber has the advantages of simple structure, no moving parts, convenient manufacture, easy installation, low price and the like. In addition, the jet flow generated by the chamber can increase the pulsation of a flow field in the buffer cavity, improve the working condition of the buffer cavity and improve the efficiency output of the whole device under the condition of not changing the existing equipment and installing other accessories.

Therefore, when the device works, the high-pressure water filled in the buffer cavity can extrude the gas in the rubber bag until the water pressure and the air pressure are balanced. The modulation effect and effect of the pressure pulse of the chamber to the rubber bag device enable the working process of the rubber bag device to be more reasonable, efficient and smooth, and therefore the chamber is beneficial to absorbing the energy of the electric water hammer better. That is to say, after the self-oscillation chamber was tempered peak valley type high pressure water jet, can reach the effect that gradually changes the flow and the pressure of water for the change of discharge is slow, peaceful, can avoid the instantaneous by a wide margin fluctuation of flow and pressure, nevertheless makes fluidic instantaneous hitting power and target distance obtain effective improvement again simultaneously, thereby avoids the fluctuation of flow and pressure to cause destructive injury to the rubber membrane of rubber bag device, the equipment vibration problem that arouses when can also avoid flow and pressure to change simultaneously.

The electro-hydraulic pulse generating device has the characteristic that multiple cavity impacts are generated by one-time discharging, the application of the characteristic replaces the action of a piston and a spring arranged in the existing water hammer effect generating device, the energy utilization rate is highest, and the electro-hydraulic pulse effect and the efficiency are fully exerted; water rather than gas is used as a pressure energy conducting medium in the buffer cavity, acting force for flattening the rubber bag is applied to the rubber bag in the ellipsoidal shape, and slight change of water pressure in the ball tank can bring remarkable influence on pressure balance of the rubber bag, so that the reaction of the whole system at the moment is more sensitive, namely, the mode is more efficient and convenient, and uninterrupted intensive use can be better guaranteed. Therefore, the invention is easy to cause the gas pipeline to form 'pulse flow', can cause the effect of pulse pressurization in the gas pipeline to be achieved, causes the pipeline transmission system to save energy and reduce consumption, prevents wax and scale, reduces resistance and increases transmission, even reverses to cause higher pipeline energy consumption factors, and achieves the aim of playing a key role in key capability and key technology. Finally, the purposes of pressure output stability, low cost and no negative pressure water hammer closed-loop operation can be achieved. One of the advantages of this device is "low cost uninterrupted use".

Furthermore, although the invention is a water hammer generating device, because the invention is provided with the buffer cavity, and the buffer cavity is filled with water, the water has certain compressibility, so when the water hammer attacks, the water hammer generating device can also be used as a water hammer eliminator.

Furthermore, the device has no moving parts, and the whole device has small volume, compact structure, low manufacturing cost, easy installation, easy replacement and easy production and use. Compared with the device for generating and utilizing the water hammer effect in the prior art, the device has the advantages of good practicability, high cost performance and the like. Based on 'green', low cost, simple, independent use condition to the external environment and commercial prospect.

Drawings

FIG. 1 is a schematic diagram of the liquid-electric effect in the background art;

FIG. 2 is a schematic structural view of the present invention;

fig. 3 is a schematic view of the irregular arrangement of protrusions and depressions like the outer surface of the capsule.

FIG. 4 is a schematic diagram of the rubber bladder with a wavy surface

The device comprises an electro-hydraulic pulse generating device 1, a self-oscillation chamber 2, a spherical tank body 3, a rubber bag 4, a buffer cavity 5, a first focus and a second focus.

Detailed Description

A water hammer generating device comprises an electro-hydraulic pulse generating device 1, a self-oscillation chamber 2, a ball tank body 3 and a rubber bag 4; the outlet of the electro-hydraulic pulse generating device 1 is communicated with the inlet of the self-oscillation chamber 2; the outlet of the self-oscillation chamber 2 is communicated with the middle position of the upper part of the spherical tank body 3; the rubber bag 4 is sleeved in the ball tank; a buffer cavity 5 is formed between the inner wall of the spherical tank body 3 and the outside of the rubber bag 4; the buffer cavity 5 is filled with liquid; the rubber bag 4 is oval; the two transverse ends of the rubber bag 4 extend out of the spherical tank body 3 and are communicated with a gas pipeline; the rubber bag 4 is hermetically connected with the spherical tank body 3; the external shape of the self-oscillation chamber 2 is similar to an inverted funnel shape; the self-oscillation chambers 2 are symmetrically arranged; the self-oscillation chamber 2 is communicated with a channel opening at the middle position of the upper part of the spherical tank body 3 to form a bell mouth shape; the central axis of the self-oscillation chamber 2 is superposed with the central axis of the whole device; the flare-shaped conical expansion angle is 40-70 degrees; the cavity of the electro-hydraulic pulse generating device 1 and the cavity of the self-oscillation chamber 2 are filled with water. The spherical tank body is arranged outside the rubber bag 4, and is not arranged in a cylindrical shape like the conventional one, because the bearing capacity of the tested spherical tank body is far greater than that of the cylindrical tank body, the bearing capacity of the spherical tank body is 1 time greater than that of the cylindrical container, and the thickness of the spherical tank body 3 is only half of the thickness of the wall plate of the corresponding cylindrical container. Therefore, the manufacturing of the spherical tank body 3 can greatly reduce the consumption of steel, and generally can save the steel by 30 to 45 percent. The size of the system can be reduced, a large amount of raw materials can be saved, the manufacturing cost is lower, and the spherical tank body 3 can reduce the loss of water energy and heat energy.

Furthermore, an included angle of 25 degrees is formed between the edge of the horn-mouth-shaped channel opening and the central axis.

The electro-hydraulic pulse generator comprises an electro-hydraulic pulse generator, a working cavity, an electrode and a nozzle. In the working cavity, discharge is arranged at the position of a first focus 6 at the upper part in the rotating ellipsoid, so that shock waves generated by discharge energy are diffused by spherical waves, are refracted and reflected by the inner wall of the cavity of the ellipsoid to focus a second focus 7, and can generate high-pressure water jet and eject from a nozzle positioned at the second focus 7. The self-excited oscillation chamber modulates the high-pressure constant jet flow injected from the nozzle of the electro-hydraulic pulse generating device into pulse jet flow through the self-excited oscillation chamber, and then the pulse jet flow is sprayed out from the nozzle of the self-excited oscillation chamber. The lower nozzle is connected with the spherical tank body, the rubber bag is sleeved in the spherical tank body, a buffer cavity is formed between the inner wall of the spherical tank body and the outside of the rubber bag, liquid is filled in the buffer cavity, the rubber bag is oval, and two ends of the rubber bag are directly communicated with the gas transmission pipeline. Thus, the high-pressure pulse jet flow modulated by the self-oscillation chamber is injected into the relatively static liquid in the buffer chamber to generate energy exchange, so that the liquid in the buffer chamber generates pulsation and acts on the rubber bag efficiently.

Further, the maximum diameter of the exponential curved surface of the self-oscillation chamber is 3 times of the diameter of the inlet of the self-oscillation chamber; the inlet surface roughness Ra of the self-oscillation chamber is less than or equal to 0.8; the surface roughness Ra of the curved rotating surface in the self-oscillation cavity is less than or equal to 0.8; the outlet surface roughness Ra of the self-oscillation chamber is less than or equal to 0.8; the positioning matching precision of the outer surface of the lower nozzle ring of the rotating ellipsoid electrode working cavity and the outer surface of the self-oscillation cavity inlet ring is H6/H5; the positioning fit precision of the outer arc surface of the self-oscillation cavity outlet and the arc surface of the spherical tank body is H6/H5.

Furthermore, the rubber bag 4 is coaxial with the gas transmission pipeline, the rubber bag 4 is connected with the pipeline through a flange, and a damping gasket and a damping bolt are used at the flange part, so that the vibration and the noise can be further controlled and reduced.

Further, the liquid filled in the buffer cavity 5 is water.

Further, the volume of the rubber bag 4 is less than or equal to 1/3 of the volume of the ball tank body 3. The size of the rubber bladder 4 can be optimally set as required.

Further, the outer surface of the rubber bag 4 is arranged in a rugged manner. The outer surface of the image capsule can be irregularly provided with bulges and pits; the surface of the rubber bag 4 can also be arranged in a wave-shaped structure. The outer surface of the rubber bag 4 is provided with an effective area capable of effectively increasing water shock waves, so that the energy impact generated by the change of the water pressure in the ball tank body 3 can be effectively absorbed, the effects of controlling and eliminating vibration and noise can be achieved, the service life of the rubber bag 4 can be prolonged, and the use stability of the rubber bag 4 is ensured.

The invention adopts the electro-hydraulic pulse generating device 1 as a power source and an excitation source, the working medium adopts water, when the water hammer generating device works, the electro-hydraulic pulse generating device 1 provides power, then water jet flows through the self-oscillation chamber 2 and enters the ball tank body 3, and then the rubber bag 4 is extruded. Because the self-oscillation chamber 2 is the horn mouth form with 3 connectors of the spherical tank body, the water jet is fan-shaped when being sprayed into the spherical tank body 3 after the effect of "mediation" of this self-oscillation chamber 2, and similar "gondola water faucet", can be bigger to rubber bag 4 upper portion surface effect area, can avoid being the local concentrated impact that small burst of efflux form and liquid bullet cause rubber bag 4 and impaired. The self-oscillation chamber 2 utilizes boundary layer theory and vortex theory in fluid mechanics, and under the condition of no need of any additional auxiliary device, the geometrical-shape specific boundary condition of the self-oscillation chamber 2 converts continuous jet flow into pulse jet flow, when the high-speed jet flow of the self-oscillation chamber 2 flows downstream through the inlet of the self-oscillation chamber 2 and enters the axisymmetric chamber, the cavity of the self-oscillation chamber 2 is filled with static liquid, the high-speed jet flow and the surrounding static liquid are mixed in a turbulent way to generate energy exchange and form an unstable shear layer, due to the high jet velocity and the instability of the shear layer, the fluid around the shear layer is entrained to form an axisymmetric vortex, by the selective amplification effect of the unstable shear layer, the vorticity disturbance in a certain frequency range in the shear jet flow is amplified in the cavity of the self-excited oscillation cavity 2 to form a large-scale vortex ring structure. The shear layer forms a series of discrete vortex rings, which, upon collision with the downstream collision wall, generate pressure disturbance waves and reflect upstream (traveling upstream at sonic velocity), which in turn induce new vorticity disturbances upstream. If the pressure disturbances of the separation area and the collision area are opposite to each other, a circulation process of vortex disturbance, amplification and new vortex pulsation generation is formed, so that the impedance of the fluid in the self-oscillation chamber 2 is changed periodically, the modulation processes of complete blocking, partial blocking and non-blocking of the jet flow are completed, the process is repeated continuously, and finally the jet flow passing through the self-oscillation chamber 2 is converted into strong pulse jet flow. That is to say, the self-oscillation chamber 2 can realize the effect of buffering before energy compensation on the high-pressure water jet by means of a boundary layer theory and a vortex theory, and the effect has a certain frequency (the frequency is dozens to hundreds of different), so that the electro-hydraulic pulse generating device 1, the self-oscillation chamber 2, the buffering chamber 5, the rubber bag 4 and the pipeline of the device are more chained. Because the gas in the rubber bag 4 has the characteristic of good compressibility, the wall surface of the rubber bag 4 also has elasticity and has good expandable and contractive characteristics, therefore, as the leading or dominant force of the system, slightly smaller electro-hydraulic pressure pulse discharge energy, because of the pressure 'climbing' function of the self-excited oscillation chamber 2, the larger instantaneous striking force and effective jet distance of the jet flow can be obtained, at the moment, the pressure amplitude of the jet flow is increased, the flow field is more pulsating, thus the pressure in the buffer cavity 5 can easily reach the peak, and the fragile pressure balance between the buffer cavity 5 and the rubber bag 4 can be broken. Because the jet flow belongs to the hydraulic pulse cavitation jet flow, the jet flow is emitted into the buffer cavity 5 chamber from the bell mouth-shaped outlet, three effects of hydraulic pulse, hydraulic cavitation and instantaneous negative pressure are generated, and continuous and stable liquid flow is converted into pulse resonance flowing liquid; injecting the pulse resonance flowing liquid into the relatively static liquid at a high speed to generate a cavitation phenomenon and form a cavitation flow; impact the rubber bag with fluctuating pressure's mode to change the atress state of 5 indoor flow fields of cushion chamber and rubber bag, make the working process of 4 devices of rubber bag be rich in elasticity and toughness more, be rich in the tension dimension more, thereby strengthened the efficiency of whole device, make the efficiency of whole device obtain promoting.

The flared conical expansion angle is 40-70 degrees, and liquid flow is distributed in a fan shape when the modulated high-efficiency pulse jet flows through the nozzle and is injected into the ball tank body 3, and is similar to a shower head; when the discharge cavity is closed, strong suction force makes water flow in the buffer cavity 5 flow back into the discharge working cavity at high speed through the conical expansion nozzle, and the arrangement of the horn-shaped conical expansion angle can greatly reduce the resistance of the liquid flow, and is beneficial to the rapid flow of the fluid, thereby effectively inhibiting the vibration and noise of the whole device.

In addition, when the water hammer comes, the water hammer generating device can be used as a water hammer eliminating device. Because the invention has the buffer cavity 5, and the buffer cavity 5 is filled with water, the water has certain compressibility, therefore when the water hammer comes, the water flow in the pipeline hits back and enters the water hammer generating device under the high pressure energy of the water hammer, at this moment, the rubber bag 4 expands rapidly under the high pressure of the water hammer, absorb and weaken the water hammer caused by the rapid change of the water flow speed in the pipeline due to factors such as sudden pump stop, and the like, meanwhile, the water in the buffer cavity 5 is compressed rapidly, and the buffer cavity 5 is communicated with the two cavities at the upper part, at this moment, the roles are changed into the buffer cavity 5, the acting force of the water hammer is further buffered, the pressure rise of the water flow is inhibited, and the rubber bag 4 is protected, and the excessive deformation thereof is prevented; along with the oscillation of the water hammer wave, the liquid in the rubber bag 4 and the buffer cavity 5 continuously and repeatedly expands and contracts, and the water hammer caused by the rapid change of the water flow speed in the pipeline caused by sudden pump stop is absorbed and weakened; and when the water hammer disappears, the rubber bag 4 recovers the deformation. Therefore, the invention not only has the characteristics of the water hammer generator, but also has the function of the water hammer eliminator. Can be serially applied to gas pipelines, water supply equipment for production, life and fire fighting and other pipeline systems for conveying fluid. Especially in the aspect of long-distance pipe transmission application of natural gas and petroleum, the device has the functions of wax scale removal and prevention, blockage removal, drag reduction and transmission increase, can greatly reduce the power consumption of a thick oil pump, and plays a role in pressurization and transportation.

The invention has the following effects and advantages:

(1) the invention adopts the optimized design structure of the minimum cavity of the spherical tank body, the dead space of the cavity is reduced to the greatest extent, and the flow loss and the energy consumption caused by liquid compression are reduced, so that the device has higher use effect;

(2) the invention adopts the structural design of the self-oscillation chamber, improves the jet pressure of the nozzle from the direction of exerting the potential of the water jet, and compared with the conventional continuous jet under the same condition, the peak pressure, the erosion volume and the effective target distance of the jet of the self-oscillation pulse jet nozzle can be obviously improved, the impact pressure can reach multiple times of that of the common continuous jet, and the device has a plurality of advantages when the buffer cavity in the device exerts the pressure on the rubber bag. Therefore, the defect of small continuous energy of the existing continuous jet nozzle is overcome, and the instantaneous hitting force and the effective jet distance (target distance) of jet flow are improved, so that the working energy efficiency of the rubber bag can be greatly improved. The device has the greatest advantage that the discharge energy of the electro-hydraulic pulse generating device can be effectively reduced. The purpose of saving electric energy is achieved. In addition, the cavity structure also has the advantages of simple structure, small volume, high reliability, low cost, low abrasion, low energy consumption, wide working characteristic range and the like.

(3) The rubber bag is designed in a streamline structure, and is directly communicated with the pipeline, so that the continuity of gas delivery is ensured, the working efficiency is greatly improved, and the characteristics of energy conservation and environmental protection are fully embodied. The traditional pulse pressurization transportation device for the gas pipeline has high energy consumption and low energy utilization rate. The pulse pressurization can greatly improve the gas transmission efficiency and can obtain the gas transmission effect with high flow rate and high efficiency. The device can be used independently, and can also be provided with one set (sleeve) at a certain distance for a plurality of serial use. And the gas transmission pipeline and the liquid transmission pipeline are both applicable;

(4) the key capability of the device is that the device can generate shock waves and high-speed water flows of 'water and electricity explosion' without huge mechanical equipment such as a high-pressure water pump and the like under the condition of low electric energy consumption, and meanwhile, no dust and noise pollution exists. And the pressure and the pulse frequency are easy to adjust, thereby being convenient for realizing remote and automation. And the electro-hydraulic pulse device is beneficial to the exertion of the effect of the self-oscillation chamber, because the maximum advantage of the chamber is that the higher the pressure is, the better the effect is. The other conventional methods have high cost and low efficiency;

(5) the working medium in the buffer cavity is water instead of compressed air, so that the pulsation performance of the liquid can be fully exerted. When the system works, water enters the buffer cavity in the spherical tank body and then extrudes the rubber bag. Because the water hammer effect is generated by the spherical tank, the water hammer effect acting is mainly generated on the rubber bag, the acting power of the water hammer effect is greatly improved, and the output kinetic energy is larger. Compared with the traditional pressure tank, the 'elasticity' of the self-oscillation chamber replaces compressed air, the adaptive effect of the piston and the spring is replaced, and the problem that the buffer air bag in the pressure tank cannot stabilize pressure due to air leakage and expansion and contraction of the compressed air is solved; after the spherical tank body and the rubber bag inside the spherical tank body are integrated and sealed together, the spherical tank body is only communicated with the outlet of the self-oscillation chamber at the upper part, so that the adaptation difficulty of an electro-hydraulic pulse power system and the adaptation difficulty of the whole system device are greatly reduced. And slight change of the water pressure in the spherical tank can bring remarkable influence on the balance of the rubber bag, so that the water hammer effect of the pipe conveying system is favorably generated.

(6) The invention uses the matching of the electro-hydraulic pulse generating device and the self-excited oscillation chamber, the two are matched to generate jet flow, the amplitude of the outlet pressure can be increased by 10-30% compared with the conventional continuous jet flow, so that three effects of strong hydraulic pulse, hydraulic cavitation and instantaneous negative pressure are generated in the buffer chamber, the mixing condition of the dynamic and static water bodies is greatly improved, the turbulent motion of the water body in the buffer chamber is enhanced, the convection diffusion capability is improved, the service area of the rubber bag is increased, the flow field in the buffer chamber and the stress state of the rubber bag are changed, the instantaneous dynamic pressure of the flow field in the buffer chamber is increased by times, the horn-shaped outlet of the self-excited oscillation chamber is positioned right above the rubber bag and is close to the top working surface of the rubber bag, the propelling performance and the service area of a boundary area are increased by utilizing the pulse characteristics and the effect, and the energy conversion efficiency is higher, thereby greatly improving the working efficiency of the rubber bag device. This is the most important feature and characteristic of the present invention. Therefore, the concrete implementation mode of the invention has the characteristics of simple structure, high energy utilization rate, safety, reliability, no pollution, flexible movement, simple and convenient use and maintenance, good pressure application effect on the rubber bag and suitability for pipeline pressurization transportation.

Finally, it should be noted that: the above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Variations or modifications in different forms may occur to those skilled in the art upon reading the foregoing description. It is not necessary or necessary to exhaustively enumerate all embodiments herein, and obvious variations or modifications can be made without departing from the scope of the invention.