Cavitation monitoring and inhibiting device and method for polytetrafluoroethylene material

Abstract

The invention discloses a cavitation monitoring and inhibiting device and method for a polytetrafluoroethylene material. The cavitation monitoring and inhibiting device comprises at least one group of positive and negative conductive patches mounted in a polytetrafluoroethylene material, voltage measuring equipment and a power supply, when the positive and negative conductive patches are electrically connected with the voltage measuring equipment, the cavitation monitoring device is used for carrying out cavitation monitoring on the target surface of the polytetrafluoroethylene material according to a voltage signal; when the positive and negative conductive patches are electrically connected with a power supply, cavitation inhibition is carried out on the target surface of the polytetrafluoroethylene material. The invention provides a simple, convenient and efficient solution which is used for monitoring and inhibiting the cavitation erosion of the overflowing surface of the polytetrafluoroethylene material.

Description

Technical Field

[0001] The invention relates to the technical field of cavitation experiments in fluid mechanics, and in particular to a device and method for monitoring and inhibiting cavitation during the cavitation process of a polytetrafluoroethylene material. Background Art

[0002] Cavitation is the phenomenon that bubbles are generated and quickly collapse when the static pressure at a certain position inside the liquid is lower than the saturated vapor pressure at that temperature. The moment the bubble collapses, extremely high pressure and temperature are released, and shock waves and microjets are generated to damage the surface of the material, which is called cavitation. Polytetrafluoroethylene (PTFE), as an important flow-through surface of ultra-clean flow control components, faces the problem of surface cavitation during service, resulting in surface defects of the material and secondary pollution caused by the falling of cavitation particles. Traditional cavitation monitoring methods mainly rely on acoustic, optical and pressure sensors, and have problems such as insufficient monitoring response sensitivity and poor real-time performance. In particular, research on real-time monitoring and inhibition of PTFE surface cavitation is still in its infancy.

[0003] Studies in recent years have shown that due to the extremely high pressure and electric field at the moment of cavitation bubble collapse, PTFE will produce charge changes when it is cavitated, and ultimately make the originally insulating PTFE have certain piezoelectric properties. The basic principle of piezoelectric materials is that when they are subjected to external forces, the electric dipoles inside them will shift, resulting in charge accumulation on the surface. In order to facilitate the measurement of charges, conductive sheets (such as metal electrodes) are usually attached to both sides of the piezoelectric material (usually a film) to collect the charge generated on the surface of the material and measure the voltage difference between the two electrodes. The existing technology for PTFE piezoelectric measurement is also based on the method of measuring the voltage difference between the two electrodes. However, this method is not applicable to this patent. The use of PTFE to monitor cavitation is an emerging method derived from its own flow-through surface. In the liquid supply system, only PTFE should be in contact with the liquid, and electrode sheets cannot be attached to the pipeline.

[0004] Publication No. CN112729836A discloses a cavitation initiation state identification system based on acoustic emission and vibration sensing. The basic principle is a measurement method based on the high-frequency noise signal and vibration signal generated during cavitation, plus multiple factors such as water pressure pulsation, and the relevant signals corresponding to cavitation are identified through signal data processing technology; Publication No. CN111220702A discloses a turbine cavitation monitoring and evaluation method, which monitors ultrasonic signals and noise signals through ultrasonic sensors and vibration acceleration sensors, and processes the signals to obtain relevant criteria for cavitation and evaluation indicators of cavitation intensity.

[0005] These methods need to collect multiple signals and pre-train with a large number of sensor signals in order to realize the judgment and evaluation of cavitation. Summary of the invention

[0006] In order to solve the problems in the technical background, the present invention provides a device and method for monitoring and inhibiting cavitation of polytetrafluoroethylene materials. Based on the changes in microscopic electrical signals of polytetrafluoroethylene materials after cavitation, the present invention captures the changes and accumulation of voltage signals of polytetrafluoroethylene materials during the cavitation process by means of built-in electrodes, and performs real-time cavitation monitoring. At the same time, when a reverse voltage is applied to the device, the cavitation loss can be inhibited to a certain extent. It provides a simple and effective means for monitoring and inhibiting cavitation of polytetrafluoroethylene materials.

[0007] The technical solution adopted by the present invention is:

[0008] 1. A cavitation monitoring and suppression device for polytetrafluoroethylene materials

[0009] The cavitation monitoring and suppression device includes at least one group of positive and negative conductive patches, as well as a voltage measuring device and a power supply; each group of positive and negative conductive patches is installed in a polytetrafluoroethylene material, and each group of positive and negative conductive patches is electrically connected to the voltage measuring device or to the power supply respectively.

[0010] When each group of positive and negative conductive patches is electrically connected to the voltage measuring device, the cavitation monitoring and suppression device is used to monitor the cavitation of the target surface of the polytetrafluoroethylene material;

[0011] When each group of positive and negative conductive patches are electrically connected to a power source, the cavitation monitoring and suppression device is used to suppress cavitation on a target surface of a polytetrafluoroethylene material.

[0012] Specifically, each group of positive and negative conductive patches is arranged 0.1 to 5 mm below the target surface of the polytetrafluoroethylene material; each group of positive and negative conductive patches includes positive conductive patches and negative conductive patches arranged at intervals, and the area of ​​each positive conductive patch and negative conductive patch is 1 cm 2 Within.

[0013] Specifically, the positive and negative conductive patches are pre-embedded in the polytetrafluoroethylene material.

[0014] Specifically, the positive and negative conductive patches are embedded in pre-opened installation grooves, and then embedded in the polytetrafluoroethylene material after being fixed and sealed.

[0015] Specifically, when the cavitation monitoring and suppression device performs cavitation monitoring, the cavitation monitoring result is obtained according to the voltage signal collected by the voltage measuring device; the voltage signal is the voltage between the positive and negative conductive patches in a group of positive and negative conductive patches. The voltage signal includes real-time voltage change and cumulative voltage change.

[0016] The real-time voltage change is the voltage difference between adjacent acquisition moments. If the real-time voltage at the current moment is less than the real-time voltage at the previous moment, and the absolute value of the real-time voltage change is greater than a preset threshold, cavitation occurs on the target surface of the polytetrafluoroethylene material; otherwise, cavitation does not occur. The cumulative voltage change is the voltage difference between the real-time voltage and the initial voltage, and the cumulative voltage change is positively correlated with the degree of cavitation.

[0017] The output voltage of the power supply is 1 to 15 V (this range is applicable to the power supply voltage of various electronic equipment, and has been verified by experiments to have a cavitation inhibition effect).

[0018] Furthermore, the polytetrafluoroethylene material includes polytetrafluoroethylene parts, polytetrafluoroethylene blocks and polytetrafluoroethylene films.

[0019] Furthermore, the positive electrode conductive patch and the negative electrode conductive patch are both made of conductive copper foil tape.

[0020] 2. A method for monitoring and inhibiting cavitation of polytetrafluoroethylene materials

[0021] The cavitation monitoring and inhibition method comprises the following steps:

[0022] The process of using the cavitation monitoring and suppression device to monitor the cavitation of polytetrafluoroethylene materials is specifically as follows: the positive conductive patch and the negative conductive patch in each group of positive and negative conductive patches are electrically connected to the positive electrode and the negative electrode of the voltage measuring device respectively, the voltage measuring device is used to collect voltage signals in real time, and the target surface of the polytetrafluoroethylene material is monitored for cavitation according to the voltage signals;

[0023] The process of using the cavitation monitoring and suppression device to suppress cavitation of polytetrafluoroethylene materials is specifically as follows: the positive conductive patch and the negative conductive patch in each group of positive and negative conductive patches are electrically connected to the positive electrode and the negative electrode of the power supply respectively, and the cavitation of the target surface of the polytetrafluoroethylene material is suppressed through each group of positive and negative conductive patches.

[0024] The cavitation monitoring and inhibition method further comprises the following steps:

[0025] The polytetrafluoroethylene material equipped with the cavitation monitoring and suppression device is fixed in an ultrapure water tank, the probe of the cavitation generator is directed to the target surface of the polytetrafluoroethylene material, ultrapure water is added to the ultrapure water tank, the cavitation generator is turned on, and cavitation monitoring or cavitation suppression is started.

[0026] The process of monitoring the cavitation of the target surface of the polytetrafluoroethylene material according to the voltage signal is as follows:

[0027] Whether cavitation occurs is determined in real time according to the real-time voltage change: if the real-time voltage change is greater than a preset threshold value (the monitoring multimeter used is in the 2V gear, the accuracy is ±(0.5%+1), that is, the maximum error is ±0.002, and the threshold involved in this patent is set to one times the maximum measurement error), then cavitation occurs on the target surface of the polytetrafluoroethylene material, otherwise, cavitation does not occur; the real-time voltage change is the voltage difference between adjacent acquisition moments;

[0028] The degree of cavitation is determined based on the cumulative voltage change: the cumulative voltage change is positively correlated with the degree of cavitation; the cumulative voltage change is the voltage difference between the real-time voltage and the initial voltage.

[0029] The beneficial effects of the present invention are:

[0030] 1. The device of the present invention attaches an electrode sheet on the same side of the PTFE material, utilizes the non-uniform force of the piezoelectric material caused by cavitation and the difference in charge accumulation and distribution on the same side, captures the voltage signal change of the polytetrafluoroethylene material during the cavitation process and the cumulative change of the voltage signal after cavitation, realizes real-time cavitation monitoring, and directly obtains the cavitation monitoring results. The device of the present invention makes it possible to measure electrical signals with the electrode patch on the same side, but its voltage effect will be different from the traditional two-sided electrode structure, and the voltage signal is relatively weak relative to the two-sided electrode structure.

[0031] 2. The device of the present invention can effectively suppress the cavitation loss of the polytetrafluoroethylene material surface during overcurrent when a DC voltage is applied, thereby extending the service life of the polytetrafluoroethylene material.

[0032] 3. The method of the present invention provides a simple and efficient solution, which can realize the cavitation monitoring and suppression of the flow-through surface of polytetrafluoroethylene materials without the need for pre-collection of a large amount of data and pre-training processes.

[0033] 4. In the device of the present invention, the electrode patch does not need to be in contact with the fluid to achieve cavitation monitoring and suppression of the flow-through surface of the polytetrafluoroethylene material. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of explosion of the cavitation monitoring and suppression device in an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the implementation of the cavitation monitoring and suppression method in the embodiment of the present invention;

[0036] Figure 3 This is a physical picture of the cavitation inhibition effect in an embodiment of the present invention;

[0037] Figure 4 This is a physical picture of the conventional cavitation-damaged PTFE in the present invention;

[0038] Figure 5 A physical diagram of the implementation of the cavitation monitoring and suppression method in the embodiment of the present invention;

[0039] Figure 6 Result diagram of cavitation monitoring in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] The principle of the present invention is specifically as follows: during the cavitation process on the surface of polytetrafluoroethylene, due to the extremely high pressure and electric field at the moment of cavitation bubble collapse, the surface of polytetrafluoroethylene will produce permanent structural defects when cavitation occurs, and the charge generated by the electric field will be stored in the defect structure to form an electret state, which ultimately makes the PTFE, which originally has insulating properties, have certain piezoelectric properties. The device of the present invention collects electrical signals in real time through positive and negative conductive patches, and observes voltage changes during the stage of cavitation bubble generation and action as real-time monitoring, and accumulates charge as the cavitation process continues, so that the voltage difference between the two electrode sheets gradually increases. Due to the ionization of water and the desorption of cations, the gas-liquid interface often shows negative charge. The device of the present invention applies an electric field above the surface to be inhibited of the polytetrafluoroethylene material through positive and negative conductive patches, which can hinder the approach of cavitation bubbles, reduce the impact of bubble collapse on the sample surface, and inhibit cavitation damage to a certain extent.

[0042] The first aspect of the present invention provides a cavitation monitoring and suppression device for polytetrafluoroethylene materials. The cavitation monitoring and suppression device of the present invention comprises at least one group of positive and negative conductive patches installed in the polytetrafluoroethylene material, as well as a voltage measuring device and a power supply. Each group of positive and negative conductive patches is electrically connected to the voltage measuring device or to the power supply, respectively.

[0043] When each group of positive and negative conductive patches is electrically connected to the voltage measuring device, the cavitation monitoring and suppression device is used to monitor the cavitation of the target surface of the polytetrafluoroethylene material according to the voltage signal: the voltage signal includes real-time voltage change and cumulative voltage change. The real-time voltage change is the voltage difference between adjacent acquisition moments. If the real-time voltage at the current moment is less than the real-time voltage at the previous moment, and the absolute value of the real-time voltage change is greater than the preset threshold value (the monitoring multimeter used in the embodiment of the present invention is in the 2V position, the accuracy is ±(0.5%+1), that is, the maximum error is ±0.002, and the threshold set in the embodiment of the present invention is set to one times the maximum measurement error), then the target surface of the polytetrafluoroethylene material cavitation occurs at the current moment, otherwise, no cavitation occurs. The cumulative voltage change is the voltage difference between the real-time voltage and the initial voltage. The cumulative voltage change is positively correlated with the degree of cavitation. The greater the cumulative voltage change, the greater the degree of cavitation and the more cavitation times.

[0044] When each group of positive and negative conductive patches are electrically connected to the power supply, the cavitation monitoring and suppression device is used to suppress cavitation on the target surface of the polytetrafluoroethylene material. During the cavitation suppression process, the output voltage of the power supply is preferably 0.1 to 15V.

[0045] The target surface specifically refers to the surface that needs to be monitored or suppressed for cavitation. In a specific implementation, the target surface of the polytetrafluoroethylene material is usually a flow-through surface, that is, the target surface is in direct contact with the fluid and the fluid flows through the surface to be monitored / surface to be suppressed. For example, for a pipe or valve made of polytetrafluoroethylene material, if the bubbles in the internal liquid burst near the pipe wall, it will damage the pipe wall. At this time, the inner wall surface of the pipe or valve is the target surface. The present invention can monitor and suppress cavitation on the pipe wall by installing an electrode sheet on the inner layer of the pipe wall of the polytetrafluoroethylene pipe.

[0046] Specifically, each group of positive and negative conductive patches is arranged 0.1 to 5 mm below the target surface of the polytetrafluoroethylene material; each group of positive and negative conductive patches includes positive conductive patches and negative conductive patches arranged at intervals, and the positive and negative conductive patches are completely isolated by an insulating structure, and the positive and negative conductive patches are respectively electrically connected to the positive and negative electrodes of the voltage measuring device or the power supply through wires; the area of ​​each positive conductive patch and negative conductive patch is 1 cm 2 To ensure the sensitivity of the patch and the signal collection and conduction effects.

[0047] As an optional embodiment of the present invention, the positive and negative conductive patches are installed in the polytetrafluoroethylene material, which specifically means that the positive and negative conductive patches are pre-embedded in the polytetrafluoroethylene material. Specifically, if the thickness of the polytetrafluoroethylene material is less than 5 mm, the positive and negative conductive patches are installed on the opposite side of the target surface. If the thickness of the polytetrafluoroethylene material is greater than 5 mm, the positive and negative conductive patches can be embedded in the pre-opened installation groove 0.1 to 5 mm below the target surface of the polytetrafluoroethylene material, and then pre-embedded in the polytetrafluoroethylene material after fixing and sealing.

[0048] Optionally, the positive and negative conductive patches are embedded in the polytetrafluoroethylene material through the following process: First, the polytetrafluoroethylene material is processed to reserve a mounting groove with a thickness of 1 mm below the target surface, and a pair of positive and negative conductive patches are attached to the inner wall of the mounting groove close to the target surface. The positive and negative conductive patches are arranged at intervals and each is connected to an external device through a wire. Subsequently, the mounting groove is filled with liquid insulating tape, and after the remaining space inside the mounting groove is filled, the liquid insulating tape is left to stand until it is completely cured, and a waterproof coating is applied to the outer gap of the mounting groove.

[0049] Optionally, the positive electrode conductive patch and the negative electrode conductive patch are both made of conductive copper foil tape. The positive and negative electrode conductive patches are double-sided conductive copper foil tapes. One side of the conductive copper foil tape is bonded to the polytetrafluoroethylene material, and the other side is connected to the wire.

[0050] As another optional embodiment of the present invention, the positive and negative electrode conductive patches use a conductive coating, and the conductive coating is formed by applying conductive ink 0.1 to 5 mm below the target surface.

[0051] Optionally, the polytetrafluoroethylene material includes but is not limited to polytetrafluoroethylene parts, polytetrafluoroethylene blocks and polytetrafluoroethylene films.

[0052] A second aspect of the present invention provides a method for monitoring and inhibiting cavitation of polytetrafluoroethylene materials.

[0053] (I) The process of using the cavitation monitoring and suppression device to monitor the cavitation of polytetrafluoroethylene materials is as follows: the positive conductive patch and the negative conductive patch in each group of positive and negative conductive patches are electrically connected to the positive electrode and the negative electrode of the voltage measuring device respectively, and the voltage measuring device is used to collect the voltage signal between the positive conductive patch and the negative conductive patch in each group of positive and negative conductive patches in real time, and the target surface of the polytetrafluoroethylene material is monitored for cavitation according to the voltage signal:

[0054] Whether cavitation occurs is determined in real time based on the real-time voltage change: when the real-time voltage change of the positive and negative conductive patches is greater than the preset threshold, cavitation occurs on the target surface of the polytetrafluoroethylene material corresponding to the area covered by the positive and negative conductive patches; otherwise, cavitation does not occur; the real-time voltage change is the voltage difference between adjacent acquisition moments;

[0055] Judging the degree of cavitation based on the cumulative voltage change: The cumulative voltage change of the positive and negative conductive patches is positively correlated with the degree of cavitation. The greater the cumulative voltage change, the greater the degree of cavitation. The cumulative voltage change is the voltage difference between the real-time voltage and the initial voltage.

[0056] The process of using the cavitation monitoring and suppression device to monitor the cavitation of polytetrafluoroethylene materials also includes the following steps: fixing the polytetrafluoroethylene material in an ultrapure water tank so that the target surface of the polytetrafluoroethylene material faces the cavitation generator, adding ultrapure water to the ultrapure water tank, turning on the cavitation generator, and starting monitoring.

[0057] Furthermore, the voltage collected by the voltage measuring device increases as the number of cavitation events increases.

[0058] (ii) The process of using the cavitation monitoring and suppression device to suppress the cavitation of the polytetrafluoroethylene material is specifically as follows: the positive conductive patch and the negative conductive patch in each group of positive and negative conductive patches are electrically connected to the positive and negative electrodes of the power supply respectively, and the cavitation of the target surface of the polytetrafluoroethylene material directly above the coverage area of ​​each group of positive and negative conductive patches is suppressed.

[0059] The specific embodiments of the present invention are as follows:

[0060] Example 1

[0061] In this embodiment, the positive and negative conductive patches are installed in the polytetrafluoroethylene substrate through the following process: 1mm below the surface of the polytetrafluoroethylene disc with a diameter of 20mm and a thickness of 5mm, a space with a thickness of 1mm is turned, and this surface is the target surface (cavitation monitoring surface). The copper foil double-sided conductive tape is cut into a semicircle, and the semicircular copper foil double-sided conductive tape is connected to the wire core to make a conductive patch. A pair of positive and negative conductive patches are symmetrically attached on one side close to the cavitation monitoring surface, and the remaining turned space is completely filled with liquid insulating tape. After the liquid insulating tape is cured, a waterproof coating is applied to the outer periphery of the polytetrafluoroethylene disc.

[0062] When the cavitation monitoring and suppression device of this embodiment is used for cavitation monitoring, the wire is connected to the voltmeter, and the specific process is as follows:

[0063] First, the polytetrafluoroethylene substrate on which the cavitation monitoring and suppression device of this embodiment is installed is fixed on an acrylic bracket in a water tank, and ultrapure water is added to the water tank. The resistivity of ultrapure water is 18.2 MΩ to avoid the influence of water conductivity. Figure 2 shown.

[0064] Then, place both ends of the wire outside the sink and connect the two wires to the positive and negative probes of the multimeter respectively. Figure 4 As shown. Adjust the multimeter to 2V voltage range, the voltage display is 0±0.005V, touch the two electrodes to zero, and turn on the cavitation generator after the voltage display is stable. Cavitation is generated by the ultrasonic cell crusher. The probe of the cavitation generator is facing the target surface of the polytetrafluoroethylene material, and the setting is 2 seconds of work and 3 seconds of pause, and the duration is 10 hours.

[0065] After the cavitation is over, it can be observed that the multimeter reading remains at about 0.5V. At this time, the multimeter reading is recorded. The result is as follows: Figure 6 shown.

[0066] It can be seen that when the reading stabilizes at 0.563V, turning on the test button of the cavitation generator will produce a short cavitation jet on the surface of the device. At this time, the multimeter reading begins to decrease, and after the cavitation test is completed, it continues to decrease to 0.560V, and then the multimeter reading begins to gradually rise until it stabilizes at 0.566V. Continue to press the test button to produce short-term cavitation. At this time, the multimeter reading decreases, drops to 0.563V and then rises back to 0.571V. The device can detect the cavitation process, reduce the voltage difference between the two electrodes when cavitation occurs, and increase the voltage difference after the cavitation ends. In this case, each cavitation will increase the voltage difference by about 0.01V, which gradually accumulates. Therefore, the cavitation duration or degree can be determined by the total voltage difference after stabilization.

[0067] When using the cavitation monitoring and suppression device of this embodiment to suppress cavitation, connect the wire to a 12V DC power supply. The specific process is as follows:

[0068] First, the polytetrafluoroethylene substrate on which the cavitation monitoring and suppression device of this embodiment is installed is fixed on an acrylic bracket in a water tank, and ultrapure water is added to the water tank. The resistivity of ultrapure water is 18.2 MΩ to avoid the influence of water conductivity.

[0069] Then, place both ends of the wire outside the water tank, and connect the two wires to the positive and negative poles of a 12V DC power supply respectively. Turn on the cavitation generator, cavitation is generated by an ultrasonic cell crusher, the probe is facing the surface of the polytetrafluoroethylene device, set to work for 2 seconds and pause for 3 seconds, and the duration is 20 hours. After cavitation occurs, observe the distribution of cavitation pits and the inhibition of cavitation damage. The results are as follows Figure 3 shown.

[0070] Since the cavitation probe is facing the center of the PTFE disc, the distribution of the cavitation pits should be symmetrical with the center of the circle as the center. Figure 4 shown.

[0071] And in Figure 3 In the figure, due to the influence of the electrode voltage under the surface, the cavitation damage area extends upward and downward with the center of the circle as the center, and there are very few cavitation pits on the left and right sides. The yellow copper foil electrode below can be seen through the surface of the polytetrafluoroethylene material, and there is no obvious cavitation feature above the electrode.

[0072] In summary, the present invention uses a cavitation monitoring and suppression device for polytetrafluoroethylene materials, which is connected to a multimeter to monitor the progress and degree of cavitation in real time through voltage indication. In addition, connecting an external DC power supply can effectively reduce the impact of cavitation damage.

[0073] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

[0074] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A cavitation monitoring and suppression device for polytetrafluoroethylene material, characterized in that: The cavitation monitoring and suppression device includes at least one group of positive and negative conductive patches, a voltage measuring device and a power supply; each group of positive and negative conductive patches is installed in a polytetrafluoroethylene material, and each group of positive and negative conductive patches is electrically connected to the voltage measuring device or to the power supply respectively; When each group of positive and negative conductive patches is electrically connected to the voltage measuring device, the cavitation monitoring and suppression device is used to monitor the cavitation of the target surface of the polytetrafluoroethylene material; When each group of positive and negative conductive patches is electrically connected to a power source, the cavitation monitoring and suppression device is used to suppress cavitation on a target surface of a polytetrafluoroethylene material.

2. The cavitation monitoring and suppression device for polytetrafluoroethylene material according to claim 1, characterized in that: Each group of positive and negative conductive patches is arranged 0.1 to 5 mm below the target surface of the polytetrafluoroethylene material; each group of positive and negative conductive patches includes positive conductive patches and negative conductive patches arranged at intervals, and the area of ​​each positive conductive patch and negative conductive patch is 1 cm 2 Within.

3. The cavitation monitoring and suppression device for polytetrafluoroethylene material according to claim 1, characterized in that: The positive and negative conductive patches are pre-buried in the polytetrafluoroethylene material.

4. The cavitation monitoring and suppression device for polytetrafluoroethylene material according to claim 3, characterized in that: The positive and negative conductive patches are embedded in the pre-opened installation grooves and then embedded in the polytetrafluoroethylene material after being fixed and sealed.

5. The cavitation monitoring and suppression device for polytetrafluoroethylene material according to claim 1, characterized in that: When the cavitation monitoring and suppression device performs cavitation monitoring, a cavitation monitoring result is obtained according to a voltage signal collected by a voltage measuring device; The voltage signal includes real-time voltage change and accumulated voltage change; The real-time voltage change is the voltage difference between adjacent moments. If the real-time voltage at the current moment is less than the real-time voltage at the previous moment, and the absolute value of the real-time voltage change is greater than a preset threshold, cavitation occurs on the target surface of the polytetrafluoroethylene material; otherwise, cavitation does not occur. The cumulative voltage change is the voltage difference between the real-time voltage and the initial voltage, and the cumulative voltage change is positively correlated with the degree of cavitation.

6. The cavitation monitoring and suppression device for polytetrafluoroethylene material according to claim 1, characterized in that: The output voltage of the power supply is 1-15V.

7. The cavitation monitoring and suppression device for polytetrafluoroethylene material according to claim 1, characterized in that: The polytetrafluoroethylene material includes polytetrafluoroethylene parts, polytetrafluoroethylene blocks and polytetrafluoroethylene films; the positive electrode conductive patch and the negative electrode conductive patch both use conductive copper foil tape.

8. A method for monitoring and inhibiting cavitation of polytetrafluoroethylene material using the cavitation monitoring and inhibiting device according to any one of claims 1 to 7, characterized in that: The process of using the cavitation monitoring and suppression device to monitor the cavitation of polytetrafluoroethylene materials is specifically as follows: the positive conductive patch and the negative conductive patch in each group of positive and negative conductive patches are electrically connected to the positive electrode and the negative electrode of the voltage measuring device respectively, the voltage measuring device is used to collect voltage signals in real time, and the target surface of the polytetrafluoroethylene material is monitored for cavitation according to the voltage signals; The process of using the cavitation monitoring and suppression device to suppress cavitation of polytetrafluoroethylene materials is specifically as follows: the positive conductive patch and the negative conductive patch in each group of positive and negative conductive patches are electrically connected to the positive electrode and the negative electrode of the power supply respectively, and the cavitation of the target surface of the polytetrafluoroethylene material is suppressed through each group of positive and negative conductive patches.

9. The method for monitoring and inhibiting cavitation of polytetrafluoroethylene materials according to claim 8, characterized in that: The following steps are also included: The polytetrafluoroethylene material equipped with the cavitation monitoring and suppression device is fixed in an ultrapure water tank, the probe of the cavitation generator is directed to the target surface of the polytetrafluoroethylene material, ultrapure water is added to the ultrapure water tank, the cavitation generator is turned on, and cavitation monitoring or cavitation suppression is started.

10. The method for monitoring and inhibiting cavitation of polytetrafluoroethylene materials according to claim 8, characterized in that: The specific process of monitoring cavitation on the target surface of polytetrafluoroethylene material according to the voltage signal is as follows: Determine in real time whether cavitation occurs according to the real-time voltage change: if the real-time voltage change is greater than a preset threshold, cavitation occurs on the target surface of the polytetrafluoroethylene material; otherwise, cavitation does not occur; the real-time voltage change is the voltage difference at adjacent moments; The cavitation degree is determined according to the cumulative voltage change: the cumulative voltage change is positively correlated with the cavitation degree; the cumulative voltage change is the voltage difference between the real-time voltage and the initial voltage.

Images