Cavitation monitoring device and method for hydraulic system

Abstract

A cavitation monitoring device and method for a hydraulic system. The device comprises: a branch pipe (8) connected to a hydraulic pipe; a movable unit (13) arranged in the branch pipe and in sliding fit with the branch pipe, wherein the movable unit is configured to move along the branch pipe when the gas filling amount in a medium in the hydraulic pipe (6) is changed; an acquiring unit arranged in the branch pipe and configured to acquire position information of the movable unit; an information display unit (4) connected to the acquiring unit and configured to analyze and display the position information acquired by the acquiring unit; and a buffer unit connected to the side of the movable unit close to the hydraulic pipe. According to the device, the branch pipe is connected to the hydraulic pipe and the movable unit is arranged in the branch pipe. When the gas filling amount in the medium in the hydraulic pipe is changed, the movable unit moves and feeds back to the acquiring unit, so that the cavitation phenomenon in the hydraulic system is monitored in real time, and the reliability and stability of the hydraulic system are improved.

Description

Hydraulic system cavitation monitoring device and method Technical Field

[0001] The present invention belongs to the technical field of hydraulic cavitation monitoring, and in particular relates to a hydraulic system cavitation monitoring device and method. Background Art

[0002] Cavitation occurs when the pressure in a specific region of a liquid falls below the saturated vapor pressure at that temperature. This causes dissolved air to separate and vaporize, creating bubbles. These bubbles instantly burst, releasing significant heat and pressure. This impact causes surface deformation and material erosion, a phenomenon known as cavitation. Cavitation can be destructive to hydraulic systems and should be avoided as much as possible.

[0003] In the prior art, it is inconvenient to monitor the cavitation phenomenon in the hydraulic system in real time. Therefore, a hydraulic system cavitation monitoring device and method are provided to solve the above problem.

[0004] Summary of the Invention

[0005] In order to solve the above technical problems, the present invention proposes a hydraulic system cavitation monitoring device and method, which can connect a branch pipe to the hydraulic pipe and set an active unit in the branch pipe. When the gas filling amount in the medium in the hydraulic pipe changes, the active unit moves and feeds back to the acquisition unit, so as to monitor the cavitation phenomenon in the hydraulic system in real time, so as to improve the reliability and stability of the hydraulic system.

[0006] To achieve the above objectives, the present invention provides a hydraulic system cavitation monitoring device, comprising:

[0007] Branch pipe, connected to the hydraulic pipe;

[0008] a movable unit disposed in the branch pipe and slidingly engaged with the branch pipe, the movable unit being configured to move along the branch pipe when the gas filling amount of the medium in the hydraulic pipe changes;

[0009] The acquiring unit is disposed in the branch pipe and is configured to acquire the position information of the active unit.

[0010] Furthermore, it also includes an information display unit connected to the acquisition unit and configured to analyze and display the location information acquired by the acquisition unit.

[0011] Furthermore, it also includes a buffer unit connected to a side of the movable unit close to the hydraulic pipe.

[0012] Furthermore, the buffer unit includes: a first piston, slidingly engaged with the inner wall of the branch pipe;

[0013] A buffer spring is provided between the first piston and the movable unit, and two ends of the buffer spring are respectively fixed to the first piston and the movable unit.

[0014] Furthermore, it also includes a limiting unit, which is arranged on a side of the movable unit close to the branch pipe, and the limiting unit is fixed to the inner wall of the branch pipe and is configured to limit the movable unit.

[0015] Furthermore, the limiting unit is a piston retaining ring fixed in the branch pipe.

[0016] Furthermore, it also includes a guide pipe, both ends of which are connected to the hydraulic pipe respectively, and the branch pipe is arranged on the guide pipe and connected to the guide pipe.

[0017] Furthermore, the acquisition unit is a pressure acquisition member, and one end of the movable unit close to the pressure acquisition member is configured to apply pressure to the pressure acquisition member.

[0018] Furthermore, the pressure acquisition component includes a pressure strain gauge fixed on the inner wall of the branch pipe end surface.

[0019] A method for monitoring cavitation in a hydraulic system, using the above-mentioned hydraulic system cavitation monitoring device, includes the following steps:

[0020] Send pure water into the hydraulic pipe;

[0021] Filling the pure water with gases of different volume contents, and recording and obtaining the first position information of the active unit by the obtaining unit;

[0022] The hydraulic pipe works, the acquiring unit acquires second position information of the movable unit, and compares the first position information with the second position information to determine the volume content of the gas.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] A branch pipe is connected to the hydraulic pipe, and a movable unit is set inside the branch pipe. When the gas filling amount in the medium in the hydraulic pipe changes, the movable unit moves and feeds back to the acquisition unit, so as to monitor the cavitation phenomenon in the hydraulic system in real time and improve the reliability and stability of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0026] FIG1 is a perspective view of the positional relationship between the housing and the information display unit;

[0027] FIG2 is a perspective view of the connection relationship between the hydraulic pipe and the branch pipe;

[0028] FIG3 is a cross-sectional view of a branch pipe;

[0029] FIG4 is a schematic diagram of the first piston in the initial position state in the branch pipe;

[0030] FIG5 is a schematic diagram of the first piston in the middle position in the branch pipe;

[0031] FIG6 is a schematic diagram of the contact state between the top plate and the pressure strain gauge;

[0032] Among them, 1. Shell; 2. Hanging window; 3. Transmission line; 4. Information display unit; 5. Monitoring and protection box; 6. Hydraulic pipe; 7. Pressure strain gauge mounting plate; 8. Branch pipe; 9. Guide pipe; 10. Piston retaining ring; 11. First piston; 12. Buffer spring; 13. Movable unit; 14. Piston rod; 15. Top plate; 16. Pressure strain gauge. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 1-6 , the present invention provides a hydraulic system cavitation monitoring device, comprising: a branch pipe 8 connected to a hydraulic pipe 6; a movable unit 13 disposed within the branch pipe 8 and slidingly engaged with the branch pipe 8, wherein the movable unit 13 is configured to move along the branch pipe 8 when the gas filling amount in the medium within the hydraulic pipe 6 changes.

[0036] Specifically, the branch pipe 8 is connected to the hydraulic pipe 6, and the movable unit 13 is set in the branch pipe 8. When the gas filling amount in the medium in the hydraulic pipe 6 changes, the gas dissolved in the medium is separated and vaporized, and the medium pushes the movable unit 13 to move in the branch pipe 8. The acquisition unit obtains the changed position information of the movable unit 13, thereby realizing real-time monitoring.

[0037] Since the gas has a tendency to move upward after being vaporized after separation from the medium, the branch pipe 8 is preferably connected directly above or obliquely above the hydraulic pipe 6 so that the movable unit 13 moves upward under the push of the medium.

[0038] In a specific embodiment of the present invention, the movable unit 13 is a second piston that is slidably matched with the branch pipe 8. After the medium is filled into the branch pipe 8, it pushes the second piston to move and is monitored by the acquisition unit.

[0039] Furthermore, a piston rod 14 is fixed to the end of the second piston away from the hydraulic tube 6, and a top plate 15 is fixed to the other end of the piston rod 14. The piston rod 14 and the top plate 15 are used together. The presence of the piston rod 14 shortens the distance between the top plate 15 and the acquisition unit, and the presence of the top plate 15 facilitates the acquisition unit to obtain position information. Therefore, when the acquisition unit is operating, the position information of the top plate 15 can be used to obtain the position information of the movable unit 13.

[0040] The acquisition unit is disposed in the branch pipe 8 and is configured to acquire position information of the active unit 13 .

[0041] Specifically, the acquisition unit is fixed in the branch pipe 8 and is used to monitor the position of the active unit 13 in real time.

[0042] In this embodiment, an information display unit 4 is further included, which is connected to the acquisition unit and is configured to analyze and display the position information acquired by the acquisition unit.

[0043] Specifically, the acquisition unit is connected to the information display unit 4 through the transmission line 3, so that the information acquired by the acquisition unit is sent to the information display unit 4 and displayed by the information display unit 4. The cavitation phenomenon can be converted into visual data, and the liquid pressure of the hydraulic system can be converted into a digital signal through the acquisition unit, which greatly improves the reliability and stability of the hydraulic system.

[0044] The information display unit 4 is used to store and display the data fluctuations generated by the acquisition unit, and to perform big data comparison and analyze the cavitation degree and time of the hydraulic system.

[0045] In a specific embodiment of the present invention, the information display unit 4 is a control and display device, or other device that can analyze and display the information transmitted by the acquisition unit.

[0046] Furthermore, it also includes a shell 1, which covers the outside of the hydraulic pipe 6 and the branch pipe 8. The shell 1 is used to protect the hydraulic pipe 6 and the movable unit 13.

[0047] Furthermore, a hanging window 2 is provided on the housing 1. The hanging window 2 facilitates observation of the working condition of the branch pipe 8.

[0048] Furthermore, a monitoring and protection box 5 is fixed on the housing 1. The monitoring and protection box 5 can be fixed on the housing 1 by bolt connection, and is used to place and protect the information display unit 4.

[0049] In this embodiment, a buffer unit is further included, which is connected to a side of the movable unit 13 close to the hydraulic pipe 6 .

[0050] Specifically, the buffer unit is connected to the movable unit 13 and can be replaced according to different actual working conditions to play a buffering role and reduce the pressure of the hydraulic system.

[0051] In a specific embodiment of the present invention, the buffer unit includes: a first piston 11, which slides with the inner wall of the branch pipe 8; a buffer spring 12, which is arranged between the first piston 11 and the movable unit 13, and has its two ends fixed to the first piston 11 and the movable unit 13 respectively.

[0052] Among them, a buffer spring 12 is connected to one end of the movable unit 13 close to the hydraulic pipe 6, and the other end of the buffer spring 12 is connected to the first piston 11. The first piston 11 and the branch pipe 8 are sealed. The first piston 11 is in direct contact with the fluid medium in the hydraulic system and transmits pressure to the movable unit 13 through the buffer spring 12 to achieve buffering of the movable unit 13.

[0053] Alternatively, the buffer unit adopts other buffer structures to achieve buffering of the movable unit 13.

[0054] In this embodiment, a limiting unit is further included, which is arranged on a side of the movable unit 13 close to the branch pipe 8 . The limiting unit is fixed to the inner wall of the branch pipe 8 and is configured to limit the movable unit 13 .

[0055] Specifically, when the buffer unit is provided on the movable unit 13 , the limiting unit is provided on a side of the buffer unit close to the hydraulic pipe 6 to prevent the buffer unit from driving the movable unit 13 to separate from the branch pipe 8 .

[0056] In this embodiment, the limiting unit is a piston retaining ring 10 fixed in the branch pipe 8.

[0057] The piston retaining ring 10 can be installed in the branch pipe 8 by welding, so as to prevent the first piston 11 from moving toward the hydraulic pipe 6 .

[0058] Alternatively, the limiting unit may be a structure such as a protrusion, a plate, etc. that plays a limiting role.

[0059] In this embodiment, a flow guide pipe 9 is further included, both ends of which are respectively connected to the hydraulic pipe 6 , and a branch pipe 8 is arranged on the flow guide pipe 9 and connected to the flow guide pipe 9 .

[0060] Specifically, the guide pipe 9 preferably has a flow section parallel to the hydraulic pipe 6, and the branch pipe 8 is arranged on the flow section. The guide pipe 9 is connected to the hydraulic pipe 6 by welding to draw out the fluid in the hydraulic pipe 6, and the branch pipe 8 is connected to the guide pipe 9 by welding to protect the monitoring device.

[0061] In one embodiment of the present invention, the acquisition unit is a pressure acquisition component, and the end of the movable unit 13 close to the pressure acquisition component is configured to apply pressure to the pressure acquisition component; the pressure acquisition component includes a pressure strain gauge 16 fixed on the inner wall of the end face of the branch pipe 8.

[0062] Specifically, when the acquisition unit is a pressure acquisition component, it contacts the pressure strain gauge 16 through the top plate 15, and the pressure strain gauge 16 acquires the pressure applied by the top plate 15 and transmits the pressure information to the information display unit 4, realizing the function of converting the pressure signal into a digital signal.

[0063] Furthermore, it also includes a pressure strain gauge mounting plate 7, which is fixed to the end of the branch pipe 8 away from the hydraulic pipe 6 through multiple support plates, and the pressure strain gauge 16 is fixed on the pressure strain gauge mounting plate 7.

[0064] In another embodiment of the present invention, the acquisition unit is a distance acquisition member, and one end of the movable unit 13 close to the distance acquisition member is configured to determine the distance between the distance acquisition member and the movable unit 13; the distance acquisition member includes a distance sensor.

[0065] Specifically, the pressure strain gauge 16 is replaced with a distance sensor, and the real-time position between the top plate 15 and the distance sensor is monitored in real time, and the distance information is transmitted to the information display unit 4, thereby realizing the function of converting the distance signal into a digital signal.

[0066] A method for monitoring cavitation in a hydraulic system, using the above-mentioned hydraulic system cavitation monitoring device, includes the following steps:

[0067] Pure water is fed into the hydraulic pipe 6 ; gases with different volume contents are filled into the pure water, and the recording and obtaining unit obtains the first position information of the active unit 13 .

[0068] Specifically, before the hydraulic system officially begins operation, a comparative database must be established. This database is based on multiple data collection experiments. Initially, the hydraulic system operates under pure water conditions to ensure that no cavitation occurs in the system. Relevant data under these conditions is collected and processed before being stored in the database. Subsequently, gas with a volume content of 1% to 10% is introduced into the system to induce varying degrees of cavitation. Data under these different conditions is monitored and collected, and processed to form first position information that is stored in the database. The relevant data in the database is organized and connected to the information display unit 4 to facilitate direct access to the data in subsequent operations.

[0069] The hydraulic pipe 6 works, and the acquiring unit acquires the second position information of the movable unit 13 and compares the first position information with the second position information to determine the volume content of the gas.

[0070] Specifically, the hydraulic system starts working, and pure water is introduced into the hydraulic pipe 6. The pure water enters the branch pipe 8 through the guide pipe 9 and impacts the first piston 11. Under the impact of the liquid pressure, the first piston 11 moves upward along the branch pipe 8. Accordingly, the first piston 11 pushes the buffer spring 12, and the buffer spring 12 drives the piston rod 14 and the top plate 15 to move upward. The buffer spring 12 absorbs part of the energy of the liquid and plays a better buffering role.

[0071] Specifically, referring to FIG. 4 , at the beginning, the first piston 11 is not impacted by the liquid, and the first piston 11 is located at the piston retaining ring 10 at the bottom end of the branch pipe 8 .

[0072] 5, after the pure water is introduced, the first piston 11 moves upward under the impact of the liquid pressure, thereby driving the buffer spring 12, the movable unit 13, the piston rod 14 and the top plate 15 to move upward together and are located in the middle position of the branch pipe 8.

[0073] 6 , under the impact of the liquid pressure, the first piston 11 , the buffer spring 12 , the movable unit 13 , the piston rod 14 and the top plate 15 continue to move upward until the top plate 15 touches the pressure strain gauge 16 .

[0074] The pressure transmission path in the system is as follows: first piston 11, buffer spring 12, movable unit 13, piston rod 14, top plate 15, and pressure strain gauge 16. As cavitation occurs, the liquid contains varying volume fractions of gas, causing the liquid pressure to change accordingly. The impact of top plate 15 on pressure strain gauge 16 causes corresponding data changes, which are then transmitted via a transmission line to information display unit 4. By comparing large amounts of data on the computer system, if a sudden and dramatic data fluctuation is detected, or if the fluctuations are substantially consistent with those observed during cavitation, cavitation is considered to have occurred in the system, thereby determining the extent and timing of cavitation in the hydraulic system.

[0075] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A cavitation monitoring device for a hydraulic system, characterized in that: Comprising: A branch pipe (8), connected to the hydraulic pipe (6); A movable unit (13), arranged inside the branch pipe (8) and slidably matched with the branch pipe (8), the movable unit (13) being configured to move along the branch pipe (8) when the gas filling amount in the medium in the hydraulic pipe (6) changes; An acquisition unit, arranged inside the branch pipe (8), configured to acquire the position information of the movable unit (13).

2. The cavitation monitoring device for a hydraulic system according to claim 1, characterized in that: It further includes an information display unit (4), connected to the acquisition unit, configured to analyze and display the position information acquired by the acquisition unit.

3. The cavitation monitoring device for a hydraulic system according to claim 1, wherein: It further includes a buffer unit, connected to the side of the movable unit (13) close to the hydraulic pipe (6).

4. The cavitation monitoring device for a hydraulic system according to claim 3, wherein: The buffer unit includes: a first piston (11), slidably matched with the inner wall of the branch pipe (8); A buffer spring (12), arranged between the first piston (11) and the movable unit (13), and fixed to the first piston (11) and the movable unit (13) at both ends respectively.

5. The cavitation monitoring device for a hydraulic system according to claim 1, wherein: It further includes a limiting unit, arranged on the side of the movable unit (13) close to the branch pipe (8), the limiting unit being fixed to the inner wall of the branch pipe (8) and configured to limit the movable unit (13).

6. The cavitation monitoring device for a hydraulic system according to claim 5, characterized in that: The limiting unit is a piston retaining ring (10) fixed inside the branch pipe (8).

7. The cavitation monitoring device for a hydraulic system according to claim 1, wherein: It further includes a diversion pipe (9), with both ends respectively communicating with the hydraulic pipe (6), and the branch pipe (8) is arranged on the diversion pipe (9) and communicates with the diversion pipe (9).

8. The cavitation monitoring device for a hydraulic system according to claim 1, characterized in that: The acquisition unit is a pressure acquisition component, and one end of the movable unit (13) close to the pressure acquisition component is configured to apply pressure to the pressure acquisition component.

9. The cavitation monitoring device for a hydraulic system according to claim 8, wherein: The pressure acquisition component includes a pressure strain gauge (16), fixed to the inner wall of the end face of the branch pipe (8).

10. A cavitation monitoring method for a hydraulic system, using the hydraulic system cavitation monitoring device described in claim 1, characterized in that: The operation steps include: Feeding pure water into the hydraulic pipe (6); Filling different volume contents of gas into the pure water, and recording the first position information of the movable unit (13) acquired by the acquisition unit; The hydraulic pipe (6) works, the acquisition unit acquires the second position information of the movable unit (13), and compares the first position information with the second position information to determine the volume content of the gas.

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