Hydraulic system cavitation detection system and method based on thermocouple module

Abstract

A hydraulic system cavitation detection system and method based on a thermocouple module. The cavitation detection system comprises: a cavitation adjustment apparatus disposed at one side of a hydraulic pipeline to undergo detection (12), a first thermocouple module (9) disposed on the cavitation adjustment apparatus, a second thermocouple module (13) disposed on the hydraulic pipeline (12), and a detection control center (11) separately electrically connected to the first thermocouple module (9) and the second thermocouple module (13). The detection control center (11) is used for detecting the magnitude of a current generated between the first thermocouple module (9) and the second thermocouple module (13) due to a temperature difference. The cavitation detection method is executed by means of the cavitation detection system, realizing real-time monitoring of the cavitation phenomenon of the hydraulic system. In addition, it is possible to convert the cavitation phenomenon into visual data. Heat released by the bursting of bubbles generated by the cavitation phenomenon in the hydraulic system is converted into an electric signal by means of the thermocouple modules, which is transmitted to the detection control center, thereby improving real-time performance and accuracy of detection of a cavitation phenomenon in the hydraulic system.

Description

A hydraulic system cavitation detection system and method based on thermocouple module Technical Field

[0001] The present invention belongs to the technical field of hydraulic cavitation detection, and in particular relates to a hydraulic system cavitation detection system and method based on a thermocouple module. Background Art

[0002] Cavitation occurs when the pressure in a certain region of a liquid falls below the saturated vapor pressure at that temperature. This causes dissolved air to separate and vaporize, creating bubbles. The instantaneous collapse of these bubbles releases a significant amount of heat, potentially damaging hydraulic components.

[0003] Thermocouple sensor is a contact temperature measurement device with a simple structure and easy use. It is widely used in industrial production. Thermocouple can directly convert thermal energy into electrical signals and output DC voltage signals, making display, recording and transmission easy. In addition, thermocouples have the characteristics of stable performance, large temperature measurement range, and long-distance signal transmission.

[0004] Based on this, relying on the thermocouple module, it is possible to detect the occurrence of cavitation in the hydraulic system by making full use of the physical property that cavitation bubble rupture releases a large amount of heat.

[0005] Summary of the Invention

[0006] To this end, the present invention proposes a hydraulic system cavitation detection system and method based on a thermocouple module, aiming to improve the real-time performance and accuracy of cavitation phenomenon detection in the hydraulic system.

[0007] To achieve the above objectives, in one aspect, the present invention provides a hydraulic system cavitation detection system based on a thermocouple module, comprising:

[0008] A cavitation adjustment device, which is arranged on one side of the hydraulic pipeline to be tested and is used to simulate cavitation in the pipeline;

[0009] Thermocouple module 1, the thermocouple module 1 is arranged on the cavitation adjustment device;

[0010] Thermocouple module 2, the thermocouple module 2 is arranged on the hydraulic pipeline to be detected;

[0011] A detection control center is electrically connected to the thermocouple module 1 and the thermocouple module 2 respectively, and is used to detect the current generated by the thermocouple module 1 and the thermocouple module 2 due to the temperature difference.

[0012] Preferably, the cavitation adjustment device comprises:

[0013] water tank;

[0014] a water suction pipe connected to the water tank;

[0015] a water return pipe connected to the water tank;

[0016] A circulating water pump connected to the water suction pipe and the water return pipe;

[0017] A gas generating device is located on the water return pipe and is used to generate cavitation gas in the water return pipe.

[0018] Preferably, the gas generating device includes a venturi tube located on the return pipe and a ventilation motor located on the water inlet side of the venturi tube.

[0019] Preferably, the thermocouple module 1 is located at the water outlet side of the venturi tube.

[0020] Preferably, the return pipe is parallel to the hydraulic pipeline to be detected and has the same pipe diameter.

[0021] It can be seen from the above technical solution that the present invention provides a hydraulic system cavitation detection system based on thermocouple modules. By comparing the current size of thermocouple module 1 in the cavitation adjustment device with the current size of thermocouple module 2 in the hydraulic pipeline to be detected, the degree of cavitation in the hydraulic system can be determined.

[0022] In another aspect, the present invention further provides a method for detecting cavitation in a hydraulic system based on a thermocouple module, which is performed by the above-mentioned hydraulic system cavitation detection system based on a thermocouple module, and comprises the following steps:

[0023] Step 1: Connect the thermocouple module 1 on the cavitation adjustment device to the detection control center;

[0024] Step 2: Connect the thermocouple module 2 on the hydraulic pipeline to be tested to the test control center;

[0025] Step 3: starting the cavitation adjustment device;

[0026] Step 4: monitoring the current of the thermocouple module 2 through the detection control center;

[0027] Step 5: adjusting the cavitation degree of the cavitation adjustment device until the current of the thermocouple module 2 fluctuates;

[0028] Step 6: Record the cavitation degree value displayed by the cavitation adjustment device at this time.

[0029] Beneficial effects of the present invention:

[0030] This invention provides a hydraulic system cavitation detection system and method based on a thermocouple module. This system enables real-time monitoring of cavitation in hydraulic systems and converts cavitation into visual data. Heat released by the rupture of bubbles due to cavitation in the hydraulic system is converted into electrical signals via the thermocouple module and transmitted to a detection and control center, significantly improving the real-time and accuracy of cavitation detection in hydraulic systems. The current in the thermocouple module changes with temperature. Based on this, a detection system is constructed to artificially create the degree of cavitation. The current in thermocouple one is monitored and the degree of cavitation in the hydraulic system is analyzed by comparing the current in thermocouple two. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] FIG1 is a schematic structural diagram of a hydraulic system cavitation detection system based on a thermocouple module according to Example 1 of the present invention;

[0033] FIG2 is a positional relationship diagram of a cavitation detection system and a control system in Example 1 of the present invention;

[0034] FIG3 is a schematic structural diagram of a cavitation adjustment device in Example 1 of the present invention;

[0035] FIG4 is a flow chart of a method for detecting cavitation in a hydraulic system based on a thermocouple module according to a second embodiment of the present invention.

[0036] In the figure: 1. Water tank; 2. Suction pipe; 3. Pipe support frame; 4. Circulating water pump; 5. Return pipe; 6. Venturi tube; 7. Ventilation motor; 8. Support platform; 9. Thermocouple module 1; 10. Loop support frame; 11. Detection control center; 12. Hydraulic pipeline to be tested; 13. Thermocouple module 2. 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] The following describes the hydraulic system cavitation detection system and method based on the thermocouple module of the present invention with reference to FIG1 to FIG4.

[0040] Example 1:

[0041] Referring to Figure 1, Figure 1 shows a structural schematic diagram of a hydraulic system cavitation detection system based on a thermocouple module provided by the present invention. The cavitation detection system includes a cavitation adjustment device arranged on one side of a hydraulic pipeline 12 to be detected, and a thermocouple module 19 is provided on the cavitation adjustment device. Corresponding to the thermocouple module 19, a thermocouple module 2 13 facing the thermocouple module 19 is provided on the hydraulic pipeline 12 to be detected. The system also includes a detection control center 11 located between the thermocouple module 19 and the thermocouple module 2 13. The detection control center 11 is used to detect the current generated by the temperature difference between the thermocouple module 19 and the thermocouple module 2 13, thereby realizing cavitation detection of the hydraulic pipeline 12 to be detected, and then determining whether the hydraulic system including the hydraulic pipeline 12 to be detected has cavitation phenomenon, and determining the degree of cavitation.

[0042] Specifically, as shown in Figure 3, the cavitation adjustment device includes a water tank 1, a water intake pipe 2, a pipe support frame 3, a circulating water pump 4, a return pipe 5, a venturi tube 6, a ventilation motor 7, a support platform 8, a thermocouple module 9, and a loop support frame 10. The water intake pipe 2, the circulating water pump 4, and the return pipe 5 constitute a water circulation pipeline that circulates and connects to the water tank 1. One end of the water intake pipe 2 extends into the water tank 1, and the other end is connected to the circulating water pump 4. The circulating water pump 4 is connected to the return pipe 5, and the return end of the return pipe 5 extends into the water tank 1. The water intake pipe 2 and the return pipe 5 form a pipeline connection, with both ends of the pipeline communicating with the water tank 1. The circulating water pump 4 is provided on the pipeline. More specifically, the water intake pipe 2 is fixed by the pipe support frame 3, and the return pipe 5 is supported by the loop support frame 10. Furthermore, a section of Venturi tube 6 is provided on the return pipe 5 for generating cavitation bubbles, and a ventilation motor 7 is connected to the return pipe 5 on the water inlet side of the Venturi tube 6. The ventilation motor 7 is supported and fixed below the return pipe 5 by a support platform 8, and its ventilation end is connected to the return pipe 5 for supplying gas into the return pipe to artificially create cavitation. The ventilation level can be controlled by adjusting the ventilation motor 7. A thermocouple module 1 9 facing the hydraulic system is provided on one side of the return pipe 5 on the water outlet side of the Venturi tube 6. The hydraulic system includes a hydraulic pipeline 12 to be tested, which is arranged parallel to the return pipe 5. A thermocouple module 2 13 that cooperates with the thermocouple module 1 9 is provided on the hydraulic pipeline 12 to be tested.

[0043] Furthermore, the suction pipe 2 is bolted to the circulating water pump 4. The pipe support frame 3 is also bolted to the suction pipe 2. The circulating water pump 4 is connected to the suction pipe 2 at one end and to the return pipe 5 at the other end. The venturi tube 6 is bolted and installed in the middle of the return pipe 5. The ventilation motor 7 is installed between the venturi tube 6 and the circulating water pump 4, near the venturi tube 6. The support platform 8 is used to support the ventilation motor 7. Thermocouple module 1 9 and thermocouple module 2 13 are used in conjunction. Thermocouple module 1 9 is installed behind the venturi tube 6 and inside the return pipe 5 to detect the heat released by the cavitation bubble collapse in the cavitation detection system. Thermocouple module 2 13 is used to detect the temperature in the hydraulic pipeline 12 to be tested. The loop support frame 10 is used to support the return pipe 5. The detection control center 11 detects the current generated by the temperature difference between thermocouple module 1 9 and thermocouple module 2 13.

[0044] The operating principle of Example 1 of the present invention is as follows: Water tank 1 provides circulating water for the cavitation control device. Water flows from the suction pipe 2 to the circulating water pump 4, then from the return pipe 5 into the venturi tube 6. The venturi tube 6 generates cavitation, and the water flows back to the water tank 1 through the return pipe 5. Simultaneously, the aeration motor 7 can adjust the aeration level to provide air to the return pipe 5, artificially creating cavitation. The bursting of bubbles in the return pipe 5 releases a large amount of heat, which heats the thermocouple module 9, creating a temperature difference between the two thermocouple modules and generating an electric current.

[0045] Example 2:

[0046] Referring to FIG4 , FIG4 shows a flow chart of a hydraulic system cavitation detection method based on a thermocouple module provided by the present invention. The cavitation detection method includes the following steps:

[0047] Step S1, selecting a cavitation adjustment device including a return pipe 5 that is parallel to the hydraulic pipeline 12 to be tested and has the same diameter as the return pipe 5, installing a thermocouple module 9 on the return pipe 5; and connecting the thermocouple module 9 to the detection control center 11;

[0048] Step S2: Install the second thermocouple module 13 on the hydraulic pipeline to be tested 12; connect the second thermocouple module 13 to the test control center 11;

[0049] Step S3: pumping circulating water into the return pipe 5 and turning on the gas generating device;

[0050] Step S4: monitoring the current of the thermocouple module 2 13 through the detection control center 11;

[0051] Step S5: Adjust the bubble generation amount of the gas generating device until the current of the thermocouple module 2 13 fluctuates.

[0052] Step S6: Record the amount of bubbles generated by the gas generating device at this time as the cavitation degree value of the hydraulic pipeline 12 to be tested.

[0053] The cavitation monitoring system established by the present invention exists as a comparison. This system will always experience cavitation, and the degree of cavitation can be manually adjusted. However, during normal operation, the hydraulic system does not experience cavitation, and there will be no cavitation bubbles bursting to release a large amount of heat. Therefore, the current of the monitoring thermocouple module 2 is very small. As cavitation gradually occurs in the hydraulic system, bubbles are generated in the system. As the bubbles burst and release a large amount of heat, the current in thermocouple 2 increases and fluctuates. Based on this, the occurrence of cavitation in the hydraulic system can be determined. At the same time, by comparing the current magnitude of thermocouple 2 with that of the cavitation detection system established by the present invention, the degree of cavitation in the hydraulic system can be determined.

[0054] The beneficial effects of this invention are as follows: The basic principle of thermocouple temperature measurement is that two conductors of different materials form a closed loop. When a temperature gradient exists between the two ends, a current flows through the loop, generating an electromotive force (electromotive force) between the two ends, which is known as the Seebeck effect. Because cavitation bubble collapse releases a large amount of heat, this physical property causes the thermocouple module to generate a current due to the temperature difference between the two ends. By detecting the current of thermocouple module 2 in the hydraulic system's hydraulic pipeline and comparing it with the current of thermocouple module 1 in the system's return pipe, the presence and extent of cavitation in the hydraulic system can be determined.

[0055] Any details not provided in the present invention are conventional technical means known to those skilled in the art.

[0056] 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0057] 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 system for a hydraulic system based on a thermocouple module, characterized in that, Comprising: A cavitation adjustment device, arranged on one side of the hydraulic pipeline (12) to be detected, for simulating and generating pipeline cavitation phenomena; The first thermocouple module (9), arranged on the cavitation adjustment device; The second thermocouple module (13), arranged on the hydraulic pipeline (12) to be detected; A detection control center (12), electrically connected to the first thermocouple module (9) and the second thermocouple module (13) respectively, for detecting the magnitude of the current generated due to the temperature difference between the first thermocouple module (9) and the second thermocouple module (13).

2. The cavitation detection system for a hydraulic system based on a thermocouple module according to claim 1, wherein The cavitation adjustment device comprises: A water tank (1); A suction pipe (2), connected to the water tank (1); A return pipe (5), connected to the water tank (1); A circulation water pump (4), connecting the suction pipe (2) and the return pipe (5); A gas generating device, located on the return pipe (5), for generating cavitation gas in the return pipe (5).

3. The cavitation detection system for a hydraulic system based on a thermocouple module according to claim 2, wherein, The gas generating device comprises a venturi tube (6) located on the return pipe (5) and a ventilation motor (7) located on the water inlet side of the venturi tube (6).

4. The cavitation detection system for a hydraulic system based on a thermocouple module according to claim 3, wherein, The first thermocouple module (9) is located on the water outlet side of the venturi tube (6).

5. The cavitation detection system for a hydraulic system based on a thermocouple module according to claim 2, wherein The return pipe (5) is parallel to the hydraulic pipeline (12) to be detected and has the same pipe diameter.

6. A method for detecting cavitation in a hydraulic system based on a thermocouple module, which is executed by using the thermocouple-module-based hydraulic system cavitation detection system according to any one of claims 1 to 5. The method comprises the following steps: Step 1: Connect the first thermocouple module (9) on the cavitation adjustment device to the detection control center (11); Step 2: Connect the second thermocouple module (13) on the hydraulic pipeline (12) to be detected to the detection control center (11); Step 3: Start the cavitation adjustment device; Step 4: Monitor the magnitude of the current of the second thermocouple module (13) through the detection control center (11); Step 5: Adjust the cavitation degree of the cavitation adjustment device until the current of the second thermocouple module (13) fluctuates; Step 6: Record the cavitation degree value displayed by the cavitation adjustment device at this time.

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