Pressure-based cavitation detection device and method for pure water hydraulic system

Abstract

A pressure-based cavitation detection device and method for a pure water hydraulic system, relating to the technical field of pure water hydraulic systems. The cavitation detection device comprises: a chamber member; a flow-guiding nozzle (4) provided in the chamber member, wherein the flow-guiding nozzle (4) is communicated with the pure water hydraulic system, and the inner diameter of the flow-guiding nozzle (4) gradually increases in the inflow direction of a liquid medium, so that the liquid medium has a reduced flow velocity after being guided into the flow-guiding nozzle (4); and a detection assembly (7) comprising a housing (7.1), wherein the end of the housing (7.1) facing the flow-guiding nozzle (4) is an open end, an elastic cover plate (7.2) is provided in the open end, an electrode (7.5) is provided in the housing (7.1), diaphragms (7.4) are respectively provided on two sides of the electrode (7.5), and the electrode (7.5) fits tightly against the elastic cover plate (7.2) by means of one of the diaphragms (7.4); wherein the liquid medium is sprayed out from the flow-guiding nozzle (4) and then impacts the elastic cover plate (7.2), so that the elastic cover plate (7.2) vibrates, thereby causing the potentials on the two sides of the electrode (7.5) to change, and an output electric signal is input to a terminal. The flow-guiding inclination of the flow-guiding nozzle (4) of the cavitation detection device for the pure water hydraulic system can promote the rupture of cavitation bubbles, so that the detection assembly (7) can more sensitively detect the vibration caused by the rupture of cavitation bubbles, thereby achieving the cavitation detection of the pure water hydraulic system.

Description

A pressure-based cavitation detection device and method for pure water hydraulic system Technical Field

[0001] The present invention relates to the technical field of pure water hydraulic systems, and in particular to a pressure-based cavitation detection device and method for pure water hydraulic systems. Background Art

[0002] Hydraulic transmission uses liquid as the working medium to transfer, exchange, and control energy. Hydraulic and pneumatic transmission, also known as fluid transmission, are emerging technologies developed based on the principle of hydrostatic pressure transmission proposed by Pascal in the 17th century. It is widely used in engineering machinery, construction machinery, agricultural machinery, metallurgical machinery, mining machinery, and space launches. The level of fluid transmission technology has become an important indicator of industrial development.

[0003] Since pure water has many advantages, such as easy access, low price, no pollution, no combustion, small compression coefficient, and can replace mineral oil in various fields, pure water hydraulic transmission is attracting more and more attention.

[0004] However, the air separation pressure of pure water is higher than that of traditional mineral oil, and under the same conditions, it contains more air than traditional mineral oil. This makes the pure water hydraulic system more prone to cavitation than the traditional hydraulic oil hydraulic system.

[0005] Cavitation is the deformation and material stripping phenomenon that occurs on the surface of an object in liquid motion after being impacted by cavitation, also known as erosion or cavitation. During the cavitation process, bubbles are rapidly generated, expanded, and collapsed, forming shock waves or high-speed microjets in the liquid. After the metal material is impacted, the surface crystal structure is distorted, chemical instability occurs, and adjacent grains have different electric potentials, thereby accelerating the electrochemical corrosion process. The mechanical properties of the material in the eroded area deteriorate significantly, resulting in a sharp increase in the amount of cavitation. In the design of pure water hydraulic systems, model tests must be conducted in advance and measures must be taken to avoid cavitation as much as possible. In order to avoid cavitation, it is necessary to first detect whether cavitation has occurred and the extent of cavitation. Therefore, a pressure-based pure water hydraulic system cavitation detection device and method are urgently needed to solve the above problems.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to provide a pressure-based pure water hydraulic system cavitation detection device and method to solve the problems existing in the prior art.

[0008] To achieve the above objectives, the present invention provides the following solution: The present invention provides a pressure-based pure water hydraulic system cavitation detection device, comprising:

[0009] chamber components;

[0010] a flow guide nozzle disposed in the chamber component and connected to the pure water hydraulic system, wherein the inner diameter of the flow guide nozzle gradually increases along the inflow direction of the liquid medium so that the flow velocity of the liquid medium is reduced after being guided into the flow guide nozzle;

[0011] a detection assembly disposed in the chamber member, the detection assembly comprising a housing, the end of the housing facing the drainage nozzle being an open end, an elastic cover being disposed in the open end, an electrode being disposed in the housing, a diaphragm being disposed on either side of the electrode, the electrode being in close contact with the elastic cover via one of the diaphragms;

[0012] The liquid medium is ejected from the drainage nozzle and impacts the elastic cover, so that the elastic cover vibrates, thereby changing the potentials on both sides of the electrode, and inputting the output electrical signal to the terminal.

[0013] Preferably, the chamber component comprises:

[0014] Cylinder body;

[0015] The upper cylinder cover and the lower cylinder cover are fixed to the two ends of the cylinder body by screws respectively;

[0016] Wherein, the diversion nozzle is fixed on the lower cylinder cover, and the shell is fixed on the upper cylinder cover.

[0017] Preferably, the diversion nozzle and the housing are respectively fixed to the lower cylinder cover and the upper cylinder cover through nuts.

[0018] Preferably, the lower cylinder cover and the drainage nozzle are respectively provided with thin tubes;

[0019] Wherein, the thin tube connected to the drainage nozzle is used to introduce the liquid medium into the drainage nozzle; the thin tube connected to the lower cylinder cover is used to lead the liquid medium out of the chamber component.

[0020] Preferably, a circular insulating sleeve is fixedly connected to the inner wall of the shell, and the electrode is arranged in the circular insulating sleeve.

[0021] A pressure-based cavitation detection method for a pure water hydraulic system comprises the following steps:

[0022] Connecting the hydraulic system to the flow nozzle so that the liquid medium flows into the chamber component through the flow nozzle;

[0023] The liquid medium slows down when passing through the drainage nozzle, and the pressure increases, accelerating the rupture and causing pressure fluctuations at the bottom of the detection component;

[0024] The pressure fluctuation is converted into a corresponding electrical signal by the detection component;

[0025] An electrical signal is input to the terminal and it is determined whether cavitation occurs.

[0026] Preferably, the electrical signal is a collected pressure value and is a continuous electrical signal. The average of the pressure values ​​within three seconds is taken as n, and the maximum pressure value within three seconds is taken as m. The electrical signal is input into the terminal and the method for determining whether cavitation occurs is as follows:

[0027] When n is less than 10 MPa and m is greater than 2n, cavitation occurs, otherwise no cavitation occurs;

[0028] When n is greater than 10 MPa and less than 20 MPa, and m is greater than 1.5n, cavitation occurs, otherwise no cavitation occurs;

[0029] When n is greater than 20 MPa and less than 30 MPa, and m is greater than 1.3n, cavitation occurs, otherwise no cavitation occurs;

[0030] When n is greater than 30 MPa and m is greater than 1.1 n, cavitation occurs, otherwise no cavitation occurs.

[0031] The present invention discloses the following technical effects: the drainage slope of the drainage nozzle in the present invention can promote the rupture of cavitation bubbles, so that the detection component can more sensitively detect the vibration caused by the rupture of cavitation bubbles, thereby realizing cavitation detection of the pure water hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] FIG1 is a schematic diagram of the overall structure of a pressure-based pure water hydraulic system cavitation detection device of the present invention;

[0034] FIG2 is a schematic diagram of the internal structure of the present invention;

[0035] FIG3 is a schematic structural diagram of a detection component in the present invention;

[0036] Among them, 1. Cylinder body; 2. Upper cylinder head; 3. Lower cylinder head; 4. Diversion nozzle; 5. Capillary tube; 6. Nut; 7. Detection component; 7.1. Outer shell; 7.2. Elastic cover; 7.3. Circular insulating sleeve; 7.4. Diaphragm; 7.5. Electrode; 8. Screw. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] 1-3 , the present invention provides a pressure-based pure water hydraulic system cavitation detection device, comprising:

[0040] chamber components;

[0041] A flow guide nozzle 4 is disposed in the chamber component and is connected to the pure water hydraulic system. The inner diameter of the flow guide nozzle 4 gradually increases along the inflow direction of the liquid medium, so that the flow velocity of the liquid medium is reduced after it is guided into the flow guide nozzle 4.

[0042] A detection assembly 7 is disposed within the chamber member and includes a housing 7.1. The end of the housing 7.1 facing the drainage nozzle 4 is open, and an elastic cover sheet 7.2 is disposed within the open end. An electrode 7.5 is disposed within the housing 7.1. A diaphragm 7.4 is disposed on either side of the electrode 7.5. The electrode 7.5 is in close contact with the elastic cover sheet 7.2 via one of the diaphragms 7.4.

[0043] The liquid medium is ejected from the drainage nozzle 4 and impacts the elastic cover 7.2, so that the elastic cover 7.2 vibrates, thereby changing the potential on both sides of the electrode 7.5 and inputting the output electrical signal to the terminal.

[0044] The drainage slope of the drainage nozzle 4 provided in the present invention can promote the rupture of cavitation bubbles, so that the detection component 7 can more sensitively detect the vibration caused by the rupture of cavitation bubbles, thereby realizing cavitation detection of the pure water hydraulic system.

[0045] Further optimization scheme, the chamber components include:

[0046] Cylinder 1;

[0047] The upper cylinder cover 2 and the lower cylinder cover 3 are fixed to the two ends of the cylinder body 1 by screws 8 respectively;

[0048] The flow-inducing nozzle 4 is fixedly connected to the lower cylinder cover 3 , and the outer shell 7 . 1 is fixedly connected to the upper cylinder cover 2 .

[0049] The main structure of the cylinder body 1 is a cylindrical cylinder body 1, with six threaded holes evenly distributed on the upper and lower parts respectively, which are used to fix the upper cylinder cover 2 and the lower cylinder cover 3 by screws 8. A cylindrical hole is opened in the center of the upper cylinder cover 2 to connect the detection component 7. The upper part of the detection component 7 is opened with a cylindrical thread, which is tightly connected to the upper cylinder cover 2 through the connecting nut 6. A cylindrical hole is opened in the center of the lower cylinder cover 3 to connect the drainage nozzle 4. The lower part of the drainage nozzle 4 is opened with a cylindrical thread, which is tightly connected to the lower cylinder cover 3 through the connecting nut 6. A small circular hole is opened on the side of the center of the lower cylinder cover 3 to connect the thin tube 5, and the circular hole at the lower opening of the drainage nozzle 4 is also used to connect the thin tube 5.

[0050] According to a further optimized solution, the drainage nozzle 4 and the housing 7.1 are fixed to the lower cylinder head 3 and the upper cylinder head 2 respectively through nuts 6.

[0051] To further optimize the solution, thin tubes 5 are provided on the lower cylinder cover 3 and the drainage nozzle 4 respectively;

[0052] The thin tube 5 connected to the flow nozzle 4 is used to introduce the liquid medium into the flow nozzle 4; the thin tube 5 connected to the lower cylinder cover 3 is used to lead the liquid medium out of the chamber component.

[0053] According to a further optimized solution, a circular insulating sleeve 7.3 is fixed to the inner wall of the housing 7.1, and the electrode 7.5 is arranged in the circular insulating sleeve 7.3.

[0054] Before using this detection device, first connect it to the pure water hydraulic system through the capillary tube 5 to introduce liquid medium. The liquid medium flows into the drainage nozzle 4 through the capillary tube 5 and enters the cylinder body 1. The inclination of the drainage nozzle 4 promotes the rupture of cavitation bubbles, thereby causing the elastic cover 7.2 at the bottom of the detection component 7 to vibrate, driving the diaphragm 7.4 in the detection component 7 to vibrate, causing the electric potential on both sides of the electrode 7.5 to change. By detecting the electrical signal transmitted from the upper part of its shell 7.1, the liquid medium flows to the elastic cover 7.2, passes through the inner wall of the cylinder body 1 downward, and flows out from the capillary tube 5 connected to the circular hole on the center side of the lower cylinder cover 3.

[0055] A pressure-based cavitation detection method for a pure water hydraulic system comprises the following steps:

[0056] Connect the hydraulic system to the flow nozzle 4 so that the liquid medium flows into the chamber component through the flow nozzle 4;

[0057] The liquid medium slows down when passing through the drainage nozzle 4, and the pressure increases, accelerating the rupture, causing pressure fluctuations at the bottom of the detection component 7;

[0058] The pressure fluctuation is converted into a corresponding electrical signal by the detection component 7;

[0059] An electrical signal is input to the terminal and it is determined whether cavitation occurs.

[0060] To further optimize the solution, the electrical signal is the collected pressure value and is a continuous electrical signal. The average pressure value within three seconds is taken as n, and the maximum pressure value within three seconds is taken as m. The electrical signal is input to the terminal and the judgment method for determining whether cavitation occurs is as follows:

[0061] When n is less than 10 MPa and m is greater than 2n, cavitation occurs, otherwise no cavitation occurs;

[0062] When n is greater than 10 MPa and less than 20 MPa, and m is greater than 1.5n, cavitation occurs, otherwise no cavitation occurs;

[0063] When n is greater than 20 MPa and less than 30 MPa, and m is greater than 1.3n, cavitation occurs, otherwise no cavitation occurs;

[0064] When n is greater than 30 MPa and m is greater than 1.1 n, cavitation occurs, otherwise no cavitation occurs.

[0065] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0066] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A cavitation detection device for a pure water hydraulic system based on pressure, characterized in that, Comprising: A chamber member; A drainage nozzle (4), disposed within the chamber member and in communication with the pure water hydraulic system, the inner diameter of the drainage nozzle (4) gradually increasing in the direction of the inflow of the liquid medium, so that the flow rate of the liquid medium is reduced after being drained into the drainage nozzle (4); A detection assembly (7), disposed within the chamber member, the detection assembly (7) including a housing (7.1), one end of the housing (7.1) facing the drainage nozzle (4) being an open end, an elastic cover sheet (7.2) being disposed within the open end, an electrode (7.5) being disposed within the housing (7.1), diaphragm sheets (7.4) being respectively disposed on both sides of the electrode (7.5), and the electrode (7.5) being in close contact with the elastic cover sheet (7.2) through one of the diaphragm sheets (7.4); Wherein, after the liquid medium is ejected from the drainage nozzle (4), it impacts the elastic cover sheet (7.2), so that the elastic cover sheet (7.2) vibrates, thereby causing a change in the electric potential on both sides of the electrode (7.5), and the output electrical signal is input into the terminal.

2. The cavitation detection device for a pure water hydraulic system based on pressure according to claim 1, wherein The chamber member includes: A cylinder block (1); An upper cylinder head (2) and a lower cylinder head (3), respectively fixedly connected to both ends of the cylinder block (1) by screws (8); Wherein, the drainage nozzle (4) is fixedly connected to the lower cylinder head (3), and the housing (7.1) is fixedly connected to the upper cylinder head (2).

3. The cavitation detection device for a pure water hydraulic system based on pressure according to claim 2, wherein: Both the drainage nozzle (4) and the housing (7.1) are respectively fixedly connected to the lower cylinder head (3) and the upper cylinder head (2) by nuts (6).

4. The cavitation detection device for a pure water hydraulic system based on pressure according to claim 3, wherein: Fine tubes (5) are respectively disposed on the lower cylinder head (3) and the drainage nozzle (4); Wherein, the fine tube (5) connected to the drainage nozzle (4) is used to introduce the liquid medium into the drainage nozzle (4); the fine tube (5) connected to the lower cylinder head (3) is used to drain the liquid medium within the chamber member.

5. The cavitation detection device for a pure water hydraulic system based on pressure according to claim 4, characterized in that: A circular ring insulating sleeve (7.3) is fixedly connected to the inner wall of the housing (7.1), and the electrode (7.5) is disposed within the circular ring insulating sleeve (7.3).

6. A cavitation detection method for a pure water hydraulic system based on pressure, according to the cavitation detection device for a pure water hydraulic system based on pressure described in claim 1, characterized in that, Including the following steps: Connect the hydraulic system to the drainage nozzle (4) so that the liquid medium passes through the drainage nozzle (4) and enters the chamber member; The speed of the liquid medium passing through the drainage nozzle (4) slows down, the pressure increases and it ruptures more quickly, causing a pressure fluctuation at the bottom of the detection assembly (7); The pressure fluctuation is converted into a corresponding electrical signal by the detection assembly (7); Input the electrical signal into the terminal and determine whether cavitation occurs.

7. A cavitation detection method for a pure water hydraulic system based on pressure according to claim 6, characterized in that The electrical signal is the collected pressure value and is a continuous electrical signal. The average value of the pressure values within three seconds is taken as n, and then the highest pressure value within three seconds is taken as m. The determination method for inputting the electrical signal into the terminal and determining whether cavitation occurs is as follows: When n is less than 10 MPa and m is greater than 2n, cavitation occurs, otherwise cavitation does not occur; When n is greater than 10 MPa and less than 20 MPa and m is greater than 1.5n, cavitation occurs, otherwise cavitation does not occur; When n is greater than 20 MPa and less than 30 MPa and m is greater than 1.3n, cavitation occurs, otherwise cavitation does not occur; When n is greater than 30 MPa and m is greater than 1.1n, cavitation occurs; otherwise, cavitation does not occur.

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