Multifunctional multi-field coupling liquid cavitation test bench

Abstract

The application provides a multifunctional multi-field coupling liquid cavitation test bench, which comprises coaxially arranged first core rod seats, second core rod seats, organic glass tubes and Venturi core rods; the organic glass tubes are installed between the first core rod seats and the second core rod seats; the Venturi core rods are located in the organic glass tubes and pass through the first core rod seats and the second core rod seats at two ends respectively; the first core rod seats and the second core rod seats are respectively provided with flow inlets and flow outlets; and gaps between the Venturi core rods and the organic glass tubes form structures similar to Venturi tubes. The structure of the Venturi core rod is improved to realize cavitation tests under multiple conditions and cavitation tests under multiple action couplings: the cavitation state tests under different throat diameters, different convergence and expansion angles and different surface roughnesses can be realized by replacing the Venturi core rods with different shapes and surface roughnesses.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid cavitation, in particular to a multifunctional multi-field coupling type liquid cavitation test bench, and especially to a test device for simulating the cavitation phenomenon of a Venturi tube under multiple working conditions. BACKGROUND

[0002] In the technical field of liquid cavitation, when the local pressure in the liquid is reduced, the process of the generation, development and collapse of gas cavitation (cavitation bubbles) on the liquid-solid interface or inside the liquid is called "cavitation". During the process of liquid cavitation, the cavitation bubbles are rapidly generated, expanded and collapsed, and shock waves or high-speed micro-jets are formed in the liquid. In actual production, gear pumps, hydrofoils, propellers, diesel engine cylinder sleeves and other devices may encounter adverse effects such as efficiency reduction and material erosion caused by cavitation, so the study of cavitation phenomenon is a hot topic.

[0003] So far, the experimental equipment for studying liquid cavitation phenomenon in the laboratory mainly includes a high-speed cavitation water tunnel, a decompression water tank, an ultrasonic cavitation device, a Venturi tube cavitation device, a rotating disc cavitation device, a cavitation jet device, etc., but the most commonly used is the Venturi tube cavitation device. The principle of the Venturi tube cavitation device is that according to the principle of mass conservation, for a fluid that is difficult to compress, when its flow cross-sectional area decreases, its flow velocity will increase, and according to Bernoulli's principle, the flow velocity increases and the pressure decreases, so cavitation phenomenon occurs at this point.

[0004] At present, the structures of the Venturi cavitation devices widely used at home and abroad are basically the same, which provide a pressure difference between the two sides of the Venturi tube by a pump or other devices, the pipeline has a converging section to generate cavitation phenomenon, a control valve is used to control the flow rate of the liquid, etc., which can basically meet the needs of generating and studying the static Venturi cavitation phenomenon, but in engineering practice, there may be disturbance factors such as local vibration and temperature change, and the conventional Venturi cavitation test device is difficult to simulate such conditions well. In order to more clearly observe the Venturi cavitation phenomenon, a transparent organic glass is often used to make the Venturi tube, but since the conventional Venturi tube is a variable-diameter hole, its processing difficulty is relatively large, and it is required to be high in observation of the smoothness and flatness of the inner wall surface, which not only causes processing difficulty, but also makes it difficult to simulate the influence of a relatively high roughness surface on cavitation. Therefore, the existing Venturi cavitation test device has the disadvantages of limited research scope, poor device applicability, and difficult part processing and manufacturing.

[0005] Most of the existing Venturi tube cavitation devices use an integrally processed Venturi tube as a cavitation generator. However, the Venturi cavitation tube is a variable-diameter hole, which is difficult to process, and if different Venturi tube geometric parameters need to be studied to affect the cavitation phenomenon, multiple Venturi tubes need to be prepared, which is high in manufacturing cost.

[0006] As provided in application No. CN201811509422.6, a relative position adjustable Venturi and multi-hole orifice plate composite cavitation device, the patent can change the geometry of the throat of the Venturi tube by replacing the multi-hole orifice plate aperture size and relative position at the throat of the Venturi tube.

[0007] As provided in application No. CN202010554183.7, a throat diameter adjustable Venturi tube, the patent can realize throat size adjustment through flexible deformation.

[0008] The above two patents have the advantages of simple and efficient scheme, low cost, etc., but the problems of the structure of the multi-hole orifice plate in patent 1 and the flexible adjustable throat tube material in patent 2 both have the defect that it is difficult to observe the fluid change at the throat of the Venturi tube, which makes it impossible to effectively observe the generation of the cavitation phenomenon of the Venturi tube, which is insufficient for studying the generation, development and collapse of the cavitation phenomenon of the Venturi tube. And both patents cannot change the geometric size of the converging section and the expanding section of the Venturi tube according to the size of the throat, and the adjustable degree of freedom is single. SUMMARY

[0009] To meet the needs of not affecting the test observation, easy to manufacture and change the geometric parameters of the Venturi tube, etc., the present application discloses a multifunctional multi-field coupled liquid cavitation test bed, which uses a combination of a transparent organic glass tube and a Venturi core rod instead of a conventional Venturi tube, and the throat of the Venturi tube is formed between the largest diameter of the Venturi core rod and the inner wall of the organic glass. This structure has the advantages of easy cavitation generation, simple structure, easy installation, and observation of the whole process of cavitation generation, development and collapse. The present application improves the structure of the Venturi core rod to realize cavitation test under multiple conditions and cavitation test under multi-action coupling: different throat diameters, different convergence and expansion angles, and different surface roughness can be realized by replacing Venturi core rods with different shapes and surface roughness parameters.

[0010] The technical means adopted by the present application are as follows:

[0011] A multifunctional multi-field coupled liquid cavitation test bed, comprising a first core rod seat, a second core rod seat, an organic glass tube and a Venturi core rod arranged coaxially;

[0012] The organic glass tube is installed between the first core rod seat and the second core rod seat;

[0013] The first core rod seat is provided with a first through hole in the axial direction thereof, and the outer wall of the first core rod seat is provided with a flow inlet communicating with the first through hole, and the outer wall of the second core rod seat is provided with a flow outlet communicating with the second through hole;

[0014] The Venturi core rod comprises thick diameter sections at both ends and a thin diameter section in the middle, the thin diameter section is provided with a variable diameter section, the variable diameter section is located in the organic glass tube, the outer diameter of the variable diameter section gradually increases and then gradually decreases, the axial length of the gradually decreasing part is greater than that of the gradually increasing part, and the gradually decreasing part is close to the second core rod seat;

[0015] The two ends of the thin diameter section are located in the first through hole and the second through hole respectively, and part of the two thick diameter sections passes out of the first core rod seat and the second core rod seat through the first through hole and the second through hole, part of which is located in the first through hole and the second through hole, and does not block the flow inlet and the flow outlet, the thick diameter section located at one end of the second core rod seat is connected with a driving mechanism, and the driving mechanism is used to drive the Venturi core rod to vibrate along its axial direction or to drive the Venturi core rod to rotate.

[0016] Preferably, the first core rod seat and the second core rod seat are connected as a whole through connecting fastening studs.

[0017] Preferably, a first pressing plate is fixed on the first core rod seat through an adjusting bolt, the first pressing plate is sleeved outside the thick diameter section, a second pressing plate is also sleeved outside the part of the thick diameter section located outside the first core rod seat, and a return spring sleeved on the thick diameter section is arranged between the first pressing plate and the second pressing plate. Preferably, the part of the thick diameter section located outside the first core rod seat is provided with a plurality of snap spring grooves, and a snap spring is installed in one of the snap spring grooves.

[0018] Preferably, an oil channel is arranged in the Venturi core rod, one end of the oil channel is provided with an oil channel inlet, and the other end of the oil channel is provided with an oil channel outlet.

[0019] Preferably, the oil channel axially penetrates the Venturi core rod, one end of the oil channel close to the first core rod seat is the oil channel inlet, the other end of the oil channel close to the second core rod seat is sealed by an oil cover, and the oil channel outlet in communication with the oil channel is radially machined on the end of the Venturi core rod close to the second core rod seat.

[0020] Preferably, pressure sensor mounting holes are machined on the side wall of the organic glass tube at both ends of the variable diameter section, and pressure sensors are installed in the pressure sensor mounting holes.

[0021] Preferably, microphone mounting holes are machined on the side wall of the organic glass tube at the maximum outer diameter of the variable diameter section and the part of the variable diameter section where the outer diameter gradually decreases, and a needle microphone is installed in the microphone mounting hole, and the sound receiving section of the needle microphone is immersed in water.

[0022] Preferably, the inner wall of the first through hole of the first mandrel seat and the second through hole of the second mandrel seat are provided with sealing ring mounting grooves, and sealing rings are mounted in the sealing ring mounting grooves to realize sealing in cooperation with the rough diameter section.

[0023] Preferably, the first mandrel seat and the second mandrel seat are provided with sealing pads at the connection positions of the first mandrel seat and the second mandrel seat and the organic glass tube.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. By using a Venturi mandrel and a transparent organic glass tube instead of a conventional integrated Venturi tube, the change in the outer diameter of the Venturi mandrel is used instead of the change in the inner diameter of the hole of the conventional integrated Venturi tube. Since the convergence and expansion, surface roughness, surface temperature change, and vibration of the Venturi tube are not realized by the organic glass tube, only an ordinary transparent organic glass tube with a fixed inner diameter and outer diameter is needed, which can effectively prevent the refraction phenomenon caused by the uneven thickness of the tube wall due to the change in the inner diameter or the outer diameter, and the influence of different materials and different wall roughness on the transparency, and is more conducive to observing the whole process of cavitation. The difficulty of processing mandrels with different shapes is much smaller than that of processing conventional Venturi tubes with integrated variable-diameter holes, which is conducive to reducing the processing time and cost caused by the preparation of Venturi tubes with multiple different parameters. In addition, the shape of the mandrel can be changed or other devices can be integrated on the mandrel to perform other researches, such as setting an ultrasonic generator on the mandrel to study ultrasonic cavitation, or installing a propeller at one end of the mandrel to study propeller cavitation.

[0026] 2. By opening a pipeline in the Venturi mandrel, the temperature of the inner wall surface of the Venturi tube can be controlled by circulating hot oil through the Venturi mandrel using an oil pump of an external oil circuit.

[0027] 3. The cooperation between the mandrel seat and the Venturi mandrel is in the form of piston-cylinder, and the Venturi mandrel is positioned in the axial direction by using a clamp spring. During installation, the Venturi mandrel only needs to be inserted into the hole of the mandrel seat to realize installation. A series of clamp spring grooves are opened on the Venturi mandrel, and by clamping the clamp spring into different positions of the clamp spring grooves, the position of the Venturi mandrel throat area relative to the mandrel seat can be adjusted. This structure is simple to process and easy to disassemble and assemble, and gives the mandrel a certain degree of freedom of movement, allowing the mandrel to move in modes such as axial vibration. The mandrel seat is provided with a return spring and an adjusting bolt, which can realize the recovery effect of the Venturi mandrel in vibration and the adjustment of the system natural frequency.

[0028] 4. The test device allows multiple factors such as vibration, surface temperature, and surface roughness to act simultaneously, and can realize multi-physical field coupling simulation which is difficult to realize by ordinary test devices.

[0029] Based on the above reasons, the present application can be widely popularized in the field of liquid cavitation and the like. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0031] Figure 1 It is a structural schematic diagram of a multifunctional multi-field coupling type liquid cavitation test bed in the specific embodiment of the present application.

[0032] Figure 2 It is a structural schematic diagram of a first core rod seat in the specific embodiment of the present application.

[0033] Figure 3 It is a structural schematic diagram of a Venturi core rod in the specific embodiment of the present application.

[0034] Figure 4 It is a structural schematic diagram of a multifunctional multi-field coupling type liquid cavitation test bed vertically installed on a bottom plate in the specific embodiment of the present application.

[0035] Figure 5 It is a structural schematic diagram of a multifunctional multi-field coupling type liquid cavitation test bed horizontally installed on a linear guide rail platform in the specific embodiment of the present application.

[0036] Figure 6 It is a structural schematic diagram of an organic glass tube installed with a pressure sensor and the like in the specific embodiment of the present application.

[0037] Figure 7 It is a three-dimensional schematic diagram of a multifunctional multi-field coupling type liquid cavitation test bed vertically installed on a bottom plate in the specific embodiment of the present application.

[0038] In the drawings:

[0039] 1, first core rod seat; 11, inlet; 12, sealing ring; 13, sealing gasket; 14, bolt hole; 15, connecting fastening stud;

[0040] 2, second core rod seat; 21, outlet;

[0041] 3, organic glass tube; 31, pressure sensor; 32, needle microphone;

[0042] 4, Venturi core rod; 41, coarse diameter section; 42, fine diameter section; 43, variable diameter section; 44, oil passage; 45, oil passage inlet; 46, oil cover; 47, oil passage outlet; 48, snap spring slot; 49, snap spring;

[0043] 5, Drive mechanism;

[0044] 6, Reset spring; 61, adjusting bolt; 62, first pressing piece; 63, second pressing piece. DETAILED DESCRIPTION

[0045] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0046] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0047] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a reference to the presence of a feature, step, operation, device, component and / or combinations thereof.

[0048] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be clear that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportions. The techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the specification when appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0049] In the description of the present application, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or positional relationship is generally based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0050] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0051] In addition, it needs to be pointed out that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0052] As Figure 1 shown, a multifunctional multi-field coupling liquid cavitation test bench, the cavitation test bench includes coaxially arranged first core rod seat 1, second core rod seat 2, organic glass tube 3 and Venturi core rod 4; the first core rod seat 1 and the second core rod seat 2 are oppositely arranged, and the opposite sides are respectively processed with circular grooves, which are used for positioning and installing the organic glass tube 3, the organic glass tube 3 is installed between the first core rod seat 1 and the second core rod seat 2 through the two circular grooves; the connection between the first core rod seat 1 and the second core rod seat 3 and the organic glass tube 3 is provided with a sealing gasket 13. The two ends of the Venturi core rod 4 respectively pass through the first core rod seat 1 and the second core rod seat 2, and are sealed by a sealing ring 12.

[0053] As Figure 1 and 2As shown, the first core rod seat 1 is provided with a first through hole along its axial direction, and the outer wall of the first core rod seat 1 is provided with a flow inlet 11 communicating with the first through hole, and the outer wall of the second core rod seat 2 is provided with a flow outlet 21 communicating with the second through hole; the first through hole and the second through hole are both stepped holes; the flow inlet 11 and the flow outlet 21 are opposite to the large aperture of the first through hole and the second through hole. The side wall of the first core rod seat 1 and the second core rod seat 2 is provided with a bolt hole 14 for connecting with other structures. The gap between the flow inlet 11, the flow outlet 21, the organic glass tube and the Venturi core rod 4 forms an internal waterway, and the flow inlet 11 and the flow outlet 21 can be threaded to facilitate connection with pipe fittings. The external waterway is composed of water pipes, water pumps, water tanks, control valves, fasteners and the like. The external waterway of the test bench can be adapted according to the user's requirements.

[0054] As shown in Figure 3 The Venturi core rod 4 includes a thick diameter section 41 at both ends and a thin diameter section 42 in the middle, and the thin diameter section 42 is provided with a variable diameter section 43, and the variable diameter section 43 is located in the organic glass tube 3; the outer diameter of the variable diameter section 43 gradually increases and then gradually decreases, and the axial length of the gradually decreasing part is greater than that of the gradually increasing part, and the gradually decreasing part is close to the second core rod seat 2.

[0055] The distance between the thin diameter section 42 of the Venturi core rod 4 and the inner wall of the organic glass tube 3 constitutes the front and rear section diameters of the ordinary Venturi tube, and the distance between the variable diameter section 43 and the inner wall of the organic glass tube 3 constitutes the converging section, throat section and expansion section of the ordinary Venturi tube, that is, the gap between the Venturi core rod 4 and the organic glass tube 3 is changed by changing the diameter of the Venturi core rod 4, so as to realize the formation of the Venturi cavitation phenomenon. The material constituting the Venturi core rod 4 and the shape and surface roughness of the thin diameter section and the variable diameter section are not fixed and are processed according to the test requirements.

[0056] The oil passage 44 is axially through the Venturi core rod 4, and the oil passage 44 is the oil passage inlet 45 near one end of the first core rod seat 1, and the oil passage 44 is sealed by the oil cover 46 near one end of the second core rod seat 3, and the oil passage outlet 47 is radially machined on the end of the Venturi core rod 4 near the second core rod seat 3, and the oil passage outlet 47 is communicated with the oil passage 44, and a plurality of snap spring grooves 48 are arranged on the rough diameter section 41, and the snap spring grooves 48 are used to install the snap spring 49. The external hot oil supply oil passage is connected with the oil passage inlet 45 of the oil passage 44, and the external hot oil supply oil passage can be self-adapted according to the needs of the user, and a simple scheme is given here: a small oil supply platform can be formed by using an oil pump, an overflow valve, a throttle valve, a thermometer, an oil tank, hydraulic oil, a pipeline and the like, the pipeline is connected with the oil passage inlet 45, the throttle valve leading to the internal oil passage of the platform is closed first, the overflow effect of the overflow valve is used to heat the oil passage, and when the thermometer shows that the temperature reaches the predetermined temperature, the throttle valve is opened to supply oil to the internal oil passage of the platform, because the volume of the heating part in the platform is small and the heat capacity is also small, heating the heating part will not have a great influence on the overall oil temperature. After a period of circulation, the heating part in the platform can reach the predetermined temperature. Of course, the user can replace other external hot oil supply oil passages according to his own needs.

[0057] The internal oil passage 44 is formed by drilling a pipeline through the Venturi core rod 4, and the hot oil supplied from outside is heated through the internal oil passage 44 to heat the Venturi core rod 4. A pipe thread is machined at the oil passage inlet 45 of the Venturi core rod 4 to connect the external oil supply pipeline; the other end of the Venturi core rod 4 is drilled into the internal oil passage 44 branch by drilling inwardly perpendicular to the outside of the Venturi core rod 4, and the oil passage outlet 47 of the oil passage 44 is formed by welding a small pipeline, and the outlet is also threaded to connect the external oil supply pipeline. Because the oil passage 44 is through the Venturi core rod 4, an external thread is machined at the end of the Venturi core rod 4 to screw on the oil cover 46. The advantages of drilling the oil passage through the Venturi core rod 4 are that the Venturi core rod 4 is long, and if it is drilled from one end only, the possibility of processing failure will increase, and the cost will also increase, and the through pipeline can be drilled from both ends inwardly, which reduces the processing difficulty and reduces the processing cost, and the through pipeline is beneficial to internal cleaning, and the heating resistance can be directly placed in a specific position of the pipeline to realize local heating of the Venturi core rod 4.

[0058] As Figure 4As shown, the two ends of the narrow diameter section 42 are located at the large diameters of the first through hole and the second through hole, respectively, and the two thick diameter sections 41 pass through the small diameters of the first through hole and the second through hole to exit the first mandrel seat 1 and the second mandrel seat 2. The small diameters of the first through hole and the second through hole are adapted to the outer diameter of the thick diameter section 41; this arrangement ensures that the thick diameter section 41 will not block the inlet 11 and the outlet 21. The first mandrel seat 1 and the second mandrel seat 2 are connected as one unit by four connecting fastening studs 15. The thick diameter section 41 located at one end of the second mandrel seat 2 is connected to the drive mechanism 5, which is used to drive the Venturi mandrel 4 to vibrate along its axial direction or to drive the Venturi mandrel 4 to rotate.

[0059] like Figure 6 As shown, pressure sensor mounting holes are machined on the sidewall of the acrylic tube 3 at both ends of the variable diameter section 43, and pressure sensors 31 are installed in the pressure sensor mounting holes. Microphone mounting holes are machined on the sidewall of the acrylic tube 3 at the maximum outer diameter of the variable diameter section 43 and at the portion of the variable diameter section 43 where the outer diameter gradually decreases. A needle microphone 32 is installed in the microphone mounting hole, and the receiving section of the needle microphone 32 is immersed in water.

[0060] The cavitation test bench can stand on the base and be fixedly connected to the base using the four connecting and fastening studs 15, so that the second mandrel seat 2 sits on the base, as shown. Figure 4 and 7 As shown; it can also be placed on a base, such as Figure 5 As shown, the first mandrel seat 1 and the second mandrel seat 2 are fixed to the T-slot platform or the linear guide platform using bolt holes 14. After installation on the linear guide platform and calibration, the coaxiality between the first through hole and the second through hole of the first mandrel seat 1 and the second mandrel seat 2 can be maintained even after multiple replacements of the intermediate acrylic tube 3, which facilitates the adjustment of the device after replacing the acrylic tube 3.

[0061] like Figure 4 and 7As shown, the driving device 5 used in the embodiment is a vibration exciter for driving the Venturi core rod 4 to vibrate along its axial direction. The second core rod seat 3 is fixed on the bottom plate, and the Venturi core rod 4 is connected to the vibration exciter after passing through the bottom plate. The first pressing plate 62 is fixed on the first core rod seat 1 by adjusting bolt 61, and the first pressing plate 62 is sleeved on the rough diameter section 41. The rough diameter section 41 located outside the first core rod seat 1 is also sleeved with a second pressing plate 63, and a return spring 6 is arranged between the first pressing plate 62 and the second pressing plate 63 and sleeved on the rough diameter section 41. The rough diameter section 41 located outside the first core rod seat 1 is provided with a plurality of clamping spring grooves 48, and one of the clamping spring grooves 48 is provided with a clamping spring 49, and the second pressing plate 63 abuts against the clamping spring 49. The vibration exciter is in contact with the Venturi core rod 4, and the other end of the Venturi core rod 4 transmits the restoring force of the return spring 6 to the Venturi core rod 4 itself through the lower pressing plate 62, so as to force the Venturi core rod 4 to return in vibration. By adjusting the stiffness and initial pressure of the return spring 6, the natural frequency and return degree of the system can be adjusted, and different frequency vibrations generated by the vibration exciter are combined to realize the simulation and research of Venturi cavitation phenomenon under various vibration conditions. The clamping spring 49 is used to adjust the relative position of the Venturi core rod 4 and as part of the second pressing plate 63 to transmit the restoring force of the return spring 6 to the Venturi core rod 4;

[0062] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A multifunctional, multi-field coupled liquid cavitation test bench, characterized in that, It includes a first mandrel holder, a second mandrel holder, an acrylic tube, and a Venturi mandrel arranged coaxially; The plexiglass tube is installed between the first mandrel holder and the second mandrel holder; The first mandrel holder has a first through hole along its axial direction, and the outer wall of the first mandrel holder has an inlet communicating with the first through hole, and the outer wall of the second mandrel holder has an outlet communicating with the second through hole. The Venturi mandrel includes a coarse diameter section at both ends and a fine diameter section in the middle. A variable diameter section is provided on the fine diameter section and the variable diameter section is located inside the plexiglass tube. The outer diameter of the variable diameter section gradually increases and then gradually decreases, and the axial length of the gradually decreasing section is greater than the axial length of the gradually increasing section. The gradually decreasing section is close to the second mandrel seat. The two ends of the narrow diameter section are respectively located in the first through hole and the second through hole, and parts of the two thick diameter sections pass through the first through hole and the second through hole to exit the first mandrel seat and the second mandrel seat, and parts are located in the first through hole and the second through hole, without blocking the inlet and the outlet. The thick diameter section located at one end of the second mandrel seat is connected to the drive mechanism, which is used to drive the Venturi mandrel to vibrate along its axial direction or to drive the Venturi mandrel to rotate.

2. The multifunctional multi-field coupled liquid cavitation test bench according to claim 1, characterized in that, The first mandrel holder and the second mandrel holder are connected as one unit by a connecting fastening stud.

3. The multifunctional multi-field coupled liquid cavitation test bench according to claim 1, characterized in that, A first pressure plate is fixed to the first mandrel seat by an adjusting bolt, and the first pressure plate is sleeved outside the rough diameter section. The portion of the rough diameter section located outside the first mandrel seat is also sleeved with a second pressure plate. A return spring sleeved on the rough diameter section is provided between the first pressure plate and the second pressure plate.

4. The multifunctional multi-field coupled liquid cavitation test bench according to claim 3, characterized in that, The portion of the rough-diameter section located outside the first mandrel seat is provided with multiple retaining ring grooves, and a retaining ring is installed in one of the retaining ring grooves, with the second pressure plate abutting against the retaining ring.

5. The multifunctional multi-field coupled liquid cavitation test bench according to claim 1, characterized in that, The venturi mandrel is provided with an oil passage, one end of which has an oil inlet and the other end has an oil outlet.

6. The multifunctional multi-field coupled liquid cavitation test bench according to claim 1, characterized in that, The oil passage extends axially through the Venturi mandrel, with the oil passage inlet located at the end near the first mandrel seat and the oil passage sealed by an oil cap at the end near the second mandrel seat. The Venturi mandrel has a radially machined oil passage outlet that communicates with the oil passage at the end near the second mandrel seat.

7. The multifunctional multi-field coupled liquid cavitation test bench according to claim 1, characterized in that, The sidewall of the plexiglass tube is machined with pressure sensor mounting holes at both ends of the variable diameter section, and a pressure sensor is installed in the pressure sensor mounting hole.

8. The multifunctional multi-field coupled liquid cavitation test bench according to claim 1, characterized in that, Microphone mounting holes are machined on the sidewall of the plexiglass tube at the location corresponding to the maximum outer diameter of the variable diameter section and at the location corresponding to the portion of the variable diameter section where the outer diameter gradually decreases. A needle-type microphone is installed in the microphone mounting hole, and the receiving section of the needle-type microphone is immersed in water.

9. A multifunctional multi-field coupled liquid cavitation test bench according to claim 1, characterized in that, The inner walls of the first through hole of the first mandrel holder and the second through hole of the second mandrel holder are both provided with sealing ring mounting grooves. A sealing ring is installed in the sealing ring mounting groove, and the sealing ring cooperates with the rough diameter section to achieve a seal.

10. A multifunctional multi-field coupled liquid cavitation test bench according to claim 1, characterized in that, A sealing gasket is provided at the connection between the first mandrel holder and the second mandrel holder and the plexiglass tube.

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