Capacitance test method and system for wires and cables of medical equipment

Abstract

The invention relates to the technical field of wire and cable detection, and discloses a capacitance test method and system for a wire and a cable of medical equipment, and the method comprises the steps: obtaining geometric parameters, test frequency and environment temperature; judging according to the geometric parameters to obtain an insulation type; when the insulation type is wrapping insulation, a wrapping insulation capacitance value and a wrapping insulation abnormal value are calculated according to the geometric parameters, the test frequency and the environment temperature; when the insulation type is integral insulation, performing calculation according to the geometric parameters to obtain an integral insulation capacitance value and an integral insulation abnormal value; according to the wrapping insulation capacitance value and the overall insulation capacitance value, performing summation to obtain an actual capacitance value; and comparing the actual capacitance value with the wrapping insulation abnormal value and the overall insulation abnormal value to obtain a capacitance test result. The method can accurately calculate the capacitance value of the wire cable of the medical equipment, and ensures the safety and performance of the medical equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of wire and cable detection, and in particular to a capacitance testing method and system for wire and cable of medical equipment. Background Art

[0002] At present, wires and cables are important components used to achieve electrical connections in medical equipment, and they play an irreplaceable role in medical equipment. The safety and performance of medical equipment largely depend on the quality of wires and cables. Capacitance is an important working parameter of wires and cables. The capacitance performance of wires and cables directly affects the electrical performance and safety of medical equipment. Once there is a problem with the capacitance performance, the medical equipment will not work properly or may easily cause accidents.

[0003] In one prior art, a method for calculating the capacitance value of wires and cables is based on a model of the cable as a standard cylindrical capacitor, in which the conductive wire core and the grounded metal shielding layer constitute the two plates of the capacitor. The capacitance value is calculated by measuring the outer diameter of the insulation layer of the wire and cable and the outer diameter of the conductive wire core. However, the insulation form of wires and cables in medical equipment is more complicated and diverse than that of ordinary wires and cables, including both ordinary wire and cable insulation and self-adhesive insulation and metal wrapping. The current capacitance calculation formula for wires and cables can only measure and calculate the insulation of ordinary wires and cables, and cannot meet the separate measurement and calculation of self-adhesive insulation and metal wrapping, and cannot ensure the accuracy of measurement and calculation. Summary of the invention

[0004] The present invention provides a capacitance testing method and system for medical equipment wires and cables, so as to solve the problem of inaccurate capacitance value calculation of medical equipment wires and cables.

[0005] In the first aspect, in order to solve the above technical problems, the present invention provides a capacitance testing method for medical equipment wires and cables, comprising: Obtain the geometric parameters, test frequency and ambient temperature of the wires and cables to be tested; According to the geometric parameters, the insulation type of the wire and cable to be tested is determined; When the insulation type is wrapped insulation, the wrapped insulation capacitance value and the wrapped insulation abnormality value are calculated according to the geometric parameters, the test frequency and the ambient temperature; When the insulation type is overall insulation, calculation is performed according to the geometric parameters to obtain an overall insulation capacitance value and an overall insulation abnormality value; Performing a summation operation according to the wrapped insulation capacitance value and the overall insulation capacitance value to obtain an actual capacitance value of the wire and cable to be tested; The actual capacitance value is compared with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result.

[0006] In an optional embodiment, the geometric parameters of the wire and cable to be tested include the outer diameter of the stranded wire, the inner diameter of the stranded wire, the diameter of the stranded wire, the winding angle, the thickness of the insulation layer, the number of stranded wire layers, the outer diameter of the insulation layer, the inner diameter of the insulation layer, the stranding coefficient and the stranding pitch of the wire and cable to be tested.

[0007] In an optional implementation, the determining according to the geometric parameters to obtain the insulation type of the wire and cable to be tested includes: Analyze the outer diameter, inner diameter, diameter and pitch of the stranded wire to obtain geometric structure characteristics; When the geometric structure feature shows a multi-layer structure and includes a spiral shape, the insulation type of the wire and cable to be tested is wrapped insulation; When the geometric structure feature is a single structure, the insulation type of the wire and cable to be tested is integral insulation.

[0008] In an optional implementation, the calculating the abnormal value of the insulation of the package according to the geometric parameter, the test frequency and the ambient temperature includes: Calculate the relative dielectric constant of the wire and cable to be tested according to the test frequency and the ambient temperature; Calculate the insulation anomaly value of the package according to the relative dielectric constant and the geometric parameters; The insulation capacitance of the wrap is calculated using the following formula: The abnormal value of the insulation is calculated by the following formula: in, is the relative dielectric constant of the wire and cable to be tested, is the preset standard volume capacitance value of the wire and cable to be tested, is the non-uniform insulation coefficient of the wire and cable to be tested, is the test frequency, The first Radial dimensions of layer wrapping, For the wire and cable to be tested The annular angle between the insulation layer and the inner metal conductor between the layer wraps, is the average radial dimension of the cable to be tested, For the wire and cable to be tested The tangential capacitance between the insulating layer and the inner metal conductor between the layer wraps, is the wrapping filling factor, For the wire and cable to be tested Layer wrapping and The axial dimension of the insulation layer between the layers of wrapping, is the filling factor, is the height of the insulation layer, is the inner diameter of the insulation layer, is the outer diameter of the insulation layer.

[0009] In an optional implementation, the calculating according to the geometric parameters to obtain the overall insulation capacitance value and the overall insulation abnormality value includes: The overall insulation capacitance is calculated using the following formula: The overall insulation anomaly value is calculated using the following formula: in, is the relative dielectric constant of the copper core of the wire and cable to be tested, is the cross-sectional area of ​​the copper core of the wire and cable to be tested, is the outer diameter of the wire and cable to be tested, is the outer diameter of the outer layer of the wire and cable to be tested, is the relative dielectric constant of the insulation layer of the wire and cable to be tested, is the total thickness of the insulation layer of the wire and cable to be tested, It is the distance between the copper core and the insulation layer of the wire and cable to be tested. is the winding angle, is the fill factor, is the relative dielectric constant of the wire and cable to be tested, is the thickness of the insulating layer, is the number of strands, is the strand coefficient, is the strand diameter, is the wire pitch.

[0010] In an optional embodiment, the The relative dielectric constants of the wires and cables to be tested include: The relative dielectric constant is calculated by the following formula: in, is the test frequency, is the ambient temperature, is the temperature reference, and 7. The capacitance test method for medical equipment wires and cables according to claim 1, characterized in that the actual capacitance value is compared with the wrapping insulation abnormality value and the overall insulation abnormality value to obtain the capacitance test result, comprising: When the actual capacitance value is greater than the abnormal value of the winding insulation, the capacitance test result is abnormal winding insulation; When the actual capacitance value is less than the overall insulation abnormality value, the capacitance test result is overall abnormality; When the actual capacitance value is greater than the overall insulation abnormality value, the capacitance test result is normal; When the actual capacitance value is between the abnormal value of the winding insulation and the abnormal value of the overall insulation, the capacitance test result shows that both the winding and the overall insulation are abnormal.

[0011] In a second aspect, the present invention provides a capacitance testing system for medical equipment wires and cables, comprising: A data acquisition module is used to obtain the geometric parameters, test frequency and ambient temperature of the wire and cable to be tested; An insulation type judgment module is used to judge the insulation type of the wire and cable to be tested according to the geometric parameters; A wrapping insulation calculation module, when the insulation type is wrapping insulation, calculates the wrapping insulation capacitance value and the wrapping insulation abnormality value according to the geometric parameters, the test frequency and the ambient temperature; An overall insulation calculation module, when the insulation type is overall insulation, performs calculation according to the geometric parameters to obtain an overall insulation capacitance value and an overall insulation abnormality value; A capacitance abnormal value calculation module is used to calculate the abnormal value of the winding insulation capacitance and the abnormal value of the overall insulation capacitance according to the insulation type and the geometric parameters of the wire and cable, the test frequency and the ambient temperature, and obtain the abnormal value of the winding insulation and the abnormal value of the overall insulation; The test result output module is used to compare the actual capacitance value and the abnormal value of the winding insulation with the abnormal value of the overall insulation to obtain a capacitance test result.

[0012] In a third aspect, the present invention also provides an electronic device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements any one of the above-mentioned methods for testing the capacitance of medical device wires and cables when executing the computer program.

[0013] In a fourth aspect, the present invention further provides a computer-readable storage medium, comprising a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute any one of the above-mentioned methods for testing the capacitance of medical device wires and cables.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the present invention discloses a capacitance testing method for medical equipment wires and cables, including obtaining geometric parameters, test frequency and ambient temperature of the wires and cables to be tested; judging according to the geometric parameters to obtain the insulation type of the wires and cables to be tested; when the insulation type is wrapped insulation, calculating the wrapped insulation capacitance value and the wrapped insulation abnormality value according to the geometric parameters, the test frequency and the ambient temperature; when the insulation type is overall insulation, calculating according to the geometric parameters to obtain the overall insulation capacitance value and the overall insulation abnormality value; performing a summation operation according to the wrapped insulation capacitance value and the overall insulation capacitance value to obtain the actual capacitance value of the wires and cables to be tested; comparing the actual capacitance value with the wrapped insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result.

[0015] The present invention divides the wire and cable of complex and diverse medical equipment into two models of overall insulation and wrapping insulation according to geometric parameters. Instead of directly constructing the wire and cable into a model of a standard cylindrical capacitor. Because different insulation types have different capacitance characteristics, the calculation of capacitance value and abnormal value can ensure the accuracy of capacitance value. Wherein, the calculation of wrapping insulation capacitance value considers the influence of winding angle, non-uniform insulation coefficient of the wire and cable to be tested, test frequency, radial dimension, annular angle between insulating layer and internal metal conductor, tangential capacitance between insulating layer and internal metal conductor, wrapping filling coefficient factor on capacitance value, the calculation of overall insulation capacitance value considers the influence of relative dielectric constant of copper core, cross-sectional area of ​​copper core, outer diameter of wire and cable, outer diameter of outer layer of the wire and cable to be tested, relative dielectric constant of insulating layer, total thickness of insulating layer and distance between copper core and insulating layer on overall insulation capacitance value, and then calculates actual capacitance value, ensures the accuracy of capacitance value calculation, improves the reliability and safety of wire and cable, and ensures the safety and performance of medical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic flow chart of a capacitance testing method for medical equipment wires and cables provided by a first embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of a capacitance testing system for medical equipment wires and cables provided in the second embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0018] Reference Figure 1 The first embodiment of the present invention provides a method for testing the capacitance of a medical device wire and cable, comprising the following steps: S11, obtaining geometric parameters, test frequency and ambient temperature of the wire and cable to be tested; S12, determining the insulation type of the wire and cable to be tested according to the geometric parameters; S13, when the insulation type is wrapped insulation, calculating the wrapped insulation capacitance value and the wrapped insulation abnormality value according to the geometric parameters, the test frequency and the ambient temperature; S14, when the insulation type is overall insulation, calculating according to the geometric parameters to obtain an overall insulation capacitance value and an overall insulation abnormality value; S15, performing a summation operation according to the wrapped insulation capacitance value and the overall insulation capacitance value to obtain an actual capacitance value of the wire and cable to be tested; S16, comparing the actual capacitance value with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result.

[0019] In step S11, it is necessary to obtain the geometric parameters, test frequency and ambient temperature of the wire and cable to be tested.

[0020] It should be noted that the geometric parameters include the outer diameter of the stranded wire, the inner diameter of the stranded wire, the diameter of the stranded wire, the winding angle, the thickness of the insulation layer, the number of stranded wire layers, the outer diameter of the insulation layer, the inner diameter of the insulation layer, the stranding coefficient and the stranding pitch. These geometric parameters are obtained by direct measurement or from the design specifications of the cable and then input into the computer. The outer diameter of the stranded wire is the outermost diameter of the conductor or insulation layer after twisting, the inner diameter of the stranded wire is the innermost diameter of the conductor or insulation layer after twisting, the diameter of the stranded wire is the diameter of the stranded conductor, the winding angle refers to the angle between a single conductor and the stranding axis during the twisting process, the thickness of the insulation layer is the thickness of the insulating material, the number of stranded wire layers is the number of layers of the stranded conductor, the outer diameter of the insulation layer is the outermost surface diameter of the insulation layer, the inner diameter of the insulation layer is the inner surface diameter of the insulation layer in contact with the conductor, the stranding coefficient is a dimensionless value used to describe the geometric characteristics of the stranded conductor, and the value range is between 0.07 and 0.11. The stranding pitch refers to the distance between two adjacent turns of a single conductor on the stranding axis during the twisting process.

[0021] The outer diameter and inner diameter of the stranded wire can be directly measured by using a micrometer with an accuracy of 0.01mm or a vernier caliper with an accuracy of 0.1mm. When the diameter of the conductive wire core is less than 25mm, a micrometer is usually used for measurement; for conductive wire cores with a diameter greater than or equal to 25mm, a vernier caliper is used for measurement. The test frequency refers to the frequency of the alternating current used when testing the capacitance of wires and cables. The capacitance value will change with the change of the test frequency. The test frequency can be measured by a signal generator or a frequency meter.

[0022] Ambient temperature refers to the temperature of the surrounding medium when the cable is unloaded, which can be measured by a temperature sensor or thermometer. In wire and cable testing, ambient temperature affects the current carrying capacity and thermal stability of the cable.

[0023] In another embodiment, the number of stranded wire layers can be calculated based on the outer diameter and the inner diameter of the stranded wire, and the calculation formula is as follows: in, is the number of strands, is the strand coefficient, is the inner diameter of the strand, is the outer diameter of the stranded wire, is the fill factor.

[0024] The thickness of the insulation layer can be calculated by the inner diameter of the insulation layer, the outer diameter of the insulation layer, the width of the insulation layer and the winding angle. The calculation formula is as follows: in, is the thickness of the insulation layer, is the outer diameter of the insulation layer, is the inner diameter of the insulation layer, The winding angle.

[0025] In step S12, a judgment is made based on the geometric parameters to obtain the insulation type of the wire and cable to be tested.

[0026] In one implementation, the outer diameter, inner diameter, diameter and pitch of the stranded wire are analyzed to obtain geometric structural features. When the geometric structural features show a multi-layer structure and include a spiral shape, the insulation type of the wire and cable to be tested is wrapped insulation. When the geometric structural features are a single structure, the insulation type of the wire and cable to be tested is integral insulation.

[0027] It should be noted that the multi-layer structure refers to a cable that includes multiple twisted conductor layers, each of which is wrapped by a separate insulating material. This structure can improve the mechanical strength and insulation performance of the cable. The spiral shape refers to the conductor or insulating layer in the cable being wound in a spiral manner. In a wrapped insulated cable, the insulating material is spirally wound along the conductor at a certain winding angle to form a spiral shape. This spiral winding can provide better mechanical protection and electrical insulation. A single structure refers to a cable without layering or spiral winding. For an integrally insulated cable, the insulating material is evenly wrapped around the conductor to form a continuous insulating layer. The single structure design is used for cables that require uniform insulation protection.

[0028] By measuring the outer and inner diameters of the strands, you can get an idea of ​​the size range of the cable. If there are multiple layers, you will see a change in diameter between the layers. The change in strand diameter can indicate if the cable has a multi-layer structure. In a twisted insulated cable, the strand diameter increases as the number of insulation layers increases. When the strand pitch changes as the number of layers increases, this indicates that the cable has a multi-layer structure in a spiral shape. Otherwise, it indicates that the cable is a single structure.

[0029] This method divides the wires and cables of complex and diverse medical equipment into two models: integral insulation and wrapped insulation according to geometric parameters. Instead of directly building the wires and cables into a model of a standard cylindrical capacitor. Because different insulation types have different capacitance characteristics, calculating the capacitance value and abnormal value of different insulation types can ensure the accuracy of the capacitance value.

[0030] In step S3, when the insulation type is wrapped insulation, the wrapped insulation capacitance value and the wrapped insulation abnormality value are calculated according to the geometric parameters, the test frequency and the ambient temperature.

[0031] In one implementation, the insulation capacitance of the wrap is calculated using the following formula: The abnormal value of the insulation is calculated by the following formula: in, is the relative dielectric constant of the wire and cable to be tested, is the preset standard volume capacitance value of the wire and cable to be tested, is the non-uniform insulation coefficient of the wire and cable to be tested, is the test frequency, The first Radial dimensions of the layer wrapping, For the wire and cable to be tested The annular angle between the insulation layer and the inner metal conductor between the layer wraps, is the average radial dimension of the cable to be tested, For the wire and cable to be tested The tangential capacitance between the insulating layer and the inner metal conductor between the layer wraps, is the wrapping filling factor, For the wire and cable to be tested Layer wrapping and The axial dimension of the insulation layer between the layers of wrapping, is the filling factor, is the height of the insulation layer, is the inner diameter of the insulation layer, is the outer diameter of the insulation layer.

[0032] It should be noted that It is a preset standard volume capacitance value of the wire and cable to be tested. Specifically, it is a reference value used to compare the actual measured capacitance value to evaluate the insulation performance of the cable. The non-uniform insulation factor of the wire and cable under test is used to adjust the capacitance value to reflect the non-uniformity of the cable insulation layer, such as thickness variations or material differences. To test the frequency, in the capacitance test, because the capacitance is sensitive to frequency, Will affect the capacitance value, the value range is 40 ~ 500 . For the wire and cable to be tested The hoop angle between the insulation layer and the inner metal conductor between the layer wraps affects the geometry of the insulation layer and thus the capacitance value. For the wire and cable to be tested The tangential capacitance between the insulating layer and the internal metal conductor between the layer wraps refers to the capacitance contribution of the insulating layer in the tangential direction. It is the winding filling factor, which reflects the tightness between the winding layers and affects the capacitance characteristics of the cable. The filling factor is used to consider the filling degree of the internal space of the cable, and the value range is 0.6 to 0.9. In the wire and cable with insulation wrapped, the filling factor is a key parameter, which reflects the tightness between the wrapping layers. Presetting an upper limit value of the filling factor can ensure that the gap between the wrapping layers is not too large, thereby avoiding affecting the capacitance value and insulation performance of the cable. When the actual measured filling factor exceeds this preset upper limit value, it indicates that the gap between the wrapping layers is too large, which will cause abnormal capacitance value.

[0033] In this embodiment, the calculation of the wrapped insulation capacitance value takes into account the influence of the winding angle, the non-uniform insulation coefficient of the wire and cable to be tested, the test frequency, the radial dimension, the circumferential angle between the insulating layer and the internal metal conductor, the tangential capacitance between the insulating layer and the internal metal conductor, and the wrapping filling coefficient on the capacitance value, and the total capacitance value of the wrapped insulation is calculated by these parameters. This model can more accurately reflect the capacitance characteristics of the actual wire and cable, especially when there are many wrapping layers or the wrapping parameters vary greatly, and the capacitance value of the wire and cable can be calculated more accurately.

[0034] In one embodiment, is the relative dielectric constant of the wire and cable to be tested, which is calculated by the following formula: in, is the test frequency, is the ambient temperature, is the temperature reference, and is the correction constant.

[0035] It should be noted that As the temperature reference, take It is 25 degrees Celsius. and is the correction constant, The value range is 0.04~0.05. The value range is 3 to 5.

[0036] In step S14, when the insulation type is overall insulation, calculation is performed according to the geometric parameters to obtain an overall insulation capacitance value and an overall insulation abnormality value.

[0037] In one implementation, the overall insulation capacitance value is calculated by the following formula: The overall insulation anomaly value is calculated using the following formula: in, is the relative dielectric constant of the copper core of the wire and cable to be tested, is the cross-sectional area of ​​the copper core of the wire and cable to be tested, is the outer diameter of the wire and cable to be tested, is the outer diameter of the outer layer of the wire and cable to be tested, is the relative dielectric constant of the insulation layer of the wire and cable to be tested, is the total thickness of the insulation layer of the wire and cable to be tested, It is the distance between the copper core and the insulation layer of the wire and cable to be tested. is the winding angle, is the fill factor, is the relative dielectric constant of the wire and cable to be tested, is the thickness of the insulation layer, is the number of strands, is the strand coefficient, is the strand diameter, is the wire pitch.

[0038] It should be noted that It is the relative dielectric constant of the copper core of the wire and cable to be tested. It is a material property that indicates the response ability of the copper core to the electric field. In the capacitance value calculation, it is used to adjust the capacitance value to reflect the dielectric properties of the copper core. It can be calculated by the following formula: in, is the dielectric constant of vacuum, which is approximately . The dielectric constant of copper relative to a vacuum. For copper, this value is 1.

[0039] It is the cross-sectional area of ​​the copper core of the wire and cable to be tested. This parameter is used to calculate the volume capacitance of the copper core, which directly affects the capacitance value. It is the outer diameter of the wire and cable to be tested. It is used to determine the overall size of the cable and is the basis for calculating the capacitance of the cable or other geometric parameters. It is the outer diameter of the outer layer of the wire and cable to be tested, which is used to calculate the thickness of the cable's insulation layer. It is the relative dielectric constant of the insulation layer of the wire and cable to be tested, which reflects the dielectric properties of the insulating material and is crucial to the calculation of the capacitance value. It is the total thickness of the insulation layer of the wire and cable to be tested. It is used to calculate the volume capacitance of the insulation layer and affects the capacitance value of the cable. It is the distance between the copper core and the insulation layer of the wire and cable to be tested. In the overall insulated wire and cable, this parameter is very important for calculating the capacitance value of the cable, which directly affects the distribution of the electric field. Presetting a reference distance can be used as a benchmark for judging the insulation status of the cable. When the actual measured distance is greater than the preset reference distance, it indicates that there is a problem with the thickness or uniformity of the insulation layer, which will cause abnormal capacitance value.

[0040] In this embodiment, the calculation formula for the overall insulation capacitance value takes into account the relative dielectric constant of the copper core, the cross-sectional area of ​​the copper core, the outer diameter of the wire and cable, the outer diameter of the outer layer of the wire and cable to be tested, the relative dielectric constant of the insulation layer, the total thickness of the insulation layer and the distance between the copper core and the insulation layer. The influence of these factors on the overall insulation capacitance value. This model can more accurately reflect the overall capacitance characteristics of the actual wire and cable, and can perform a more precise calculation of the overall capacitance value of the wire and cable.

[0041] In step S15, a sum operation is performed according to the winding insulation capacitance value and the overall insulation capacitance value to obtain an actual capacitance value of the wire and cable to be tested; It should be noted that the actual capacitance value of the wire and cable to be tested refers to the quantitative measurement of the capacitance characteristics exhibited by the wire and cable as a capacitor under specific conditions. Capacitance is a physical quantity that measures the ability of wires and cables to store charge, which depends on the geometric structure, material properties and test environment of the wire and cable. The actual capacitance value reflects the ability of the wire and cable to store charge under the action of an electric field. The larger the capacitance value, the stronger the cable's ability to store charge. The actual capacitance value of the wire and cable is affected by its geometric structure, including the size of the conductor, the thickness of the insulation layer, and the number of wrapping layers. These geometric parameters affect the capacitance value by affecting the electric field distribution of the cable. The material properties of the wire and cable, such as the relative dielectric constant of the conductor and the insulation layer, also affect the actual capacitance value. The higher the relative dielectric constant, the greater the capacitance value of the cable. The actual capacitance value is also affected by the test environment, including the test frequency and ambient temperature. An increase in frequency may lead to an increase in capacitance, while changes in temperature may change the dielectric properties of the material, thereby affecting the capacitance value.

[0042] Preferably, the insulation performance of wires and cables can also be evaluated by measuring the actual capacitance value. If the actual capacitance value is different from the expected value, it indicates that the insulation layer is defective or abnormal. The actual capacitance value is crucial to the design and application of wires and cables. In high-frequency applications, the capacitance value affects the quality of signal transmission, so precise control is required. The measurement of the actual capacitance value helps ensure the safety and reliability of wires and cables. By comparing with the standard value or expected value, potential insulation problems can be detected and failures and accidents can be prevented.

[0043] The winding insulation capacitance value is an important parameter to measure the insulation performance of wire and cable winding. Its influence on insulation performance mainly reflects the uniformity of capacitance screen, insulation strength and electrical strength. In terms of capacitance screen uniformity, the winding insulation capacitance value is closely related to the uniformity of capacitance screen. By mechanically winding organic insulation material on tubular conductor and making capacitance screen in a set number of layers to form a string of coaxial cylindrical capacitors, the uniformity of radial and axial voltage distribution of capacitance screen can be achieved, thereby improving insulation strength and short circuit resistance. In terms of insulation strength, the winding insulation capacitance value can reflect the integrity and uniformity of insulation layer. If the capacitance value is abnormal, it indicates that there are defects in the insulation layer, such as damage to insulation material or loose winding, which will reduce insulation performance and increase the risk of electrical failure. In terms of electrical strength, the winding insulation capacitance value is related to the electrical strength of the main insulation. The outer layer of the main insulation is protected by an organic composite sheath, which can enhance the electrical strength and uniformity of surface potential distribution and improve the resistance to severe weather. Therefore, the winding insulation capacitance value has a direct impact on the insulation performance of wires and cables. It is not only related to the electrical safety of cables, but also an important indicator for evaluating and ensuring cable quality. By accurately measuring and analyzing the insulation capacitance of the wrapping, the reliability and stability of wires and cables can be effectively improved.

[0044] The overall insulation capacitance value is a key parameter for measuring the insulation performance of wires and cables. Its impact on the performance of wires and cables is mainly reflected in insulation quality assessment, voltage stability, signal transmission performance, thermal stability and insulation material selection. In terms of insulation quality assessment, the overall insulation capacitance value can indirectly reflect the quality of the insulation layer of wires and cables. By measuring the capacitance value of the cable, it can be evaluated whether the insulation layer is uniform and whether there are defects, such as uneven thickness or damage to the insulation layer. In terms of voltage stability, in power transmission, the capacitance value of the cable will affect the voltage regulation rate of the line. If the capacitance of the cable is too large, it will affect the voltage stability of the line. In terms of signal transmission performance, for communication cables, the overall insulation capacitance value will affect the transmission speed and quality of the signal. The capacitance value will directly affect the transmission delay and characteristic impedance of the signal. In terms of thermal stability, the overall insulation capacitance value is related to the thermal stability of the cable. During the operation of the cable, the change in capacitance value will cause heat to be generated, thereby affecting the thermal stability of the cable. In terms of insulation material selection, different insulation materials have different dielectric constants, which will directly affect the overall insulation capacitance value. Selecting the right insulation material can optimize the capacitance performance of the cable and improve the electrical and mechanical properties of the cable.

[0045] In step S16, the actual capacitance value is compared with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result including: When the actual capacitance value is greater than the abnormal value of the winding insulation, the capacitance test result is abnormal winding insulation; When the actual capacitance value is less than the overall insulation abnormality value, the capacitance test result is overall abnormality; When the actual capacitance value is greater than the overall insulation abnormality value, the capacitance test result is normal; When the actual capacitance value is between the abnormal value of the winding insulation and the abnormal value of the overall insulation, the capacitance test result shows that both the winding and the overall insulation are abnormal.

[0046] It should be noted that the abnormal value of the wrapped insulation is the preset maximum allowable capacitance value, and the abnormal value of the overall insulation is the preset minimum allowable capacitance value. When the actual capacitance value is greater than the abnormal value of the wrapped insulation, it indicates that there are defects in the wrapped insulation layer of the cable, such as damaged insulation material, uneven thickness of the insulation layer, or loose wrapping, which leads to an abnormal increase in capacitance. When the actual capacitance value is less than the abnormal value of the overall insulation, it indicates that the overall insulation performance of the cable has decreased, such as aging of the insulation material, damage to the insulation layer, or other factors that lead to an abnormal decrease in capacitance.

[0047] The following describes the working process of the present invention using a common scenario as an example. Figure 2 , which is Figure 1 Schematic diagram of the working scenario of the method.

[0048] Step 1: Obtain geometric parameters, test frequency and ambient temperature; Through measurement and design specifications, the geometric parameters of the wires and cables to be tested are obtained as follows: Test frequency: Use a signal generator to select multiple frequency points from 50 Hz to 400 Hz for testing. Ambient temperature: The test environment is stable at 20 to 25 degrees Celsius, and the temperature is controlled by a temperature control device.

[0049] Step 2: Determine the insulation type. Determine the insulation type by analyzing the geometric parameters and analyzing the geometric structure: the stranded wire diameter shows multiple layers of variation, and the winding angle =30°, indicating that the stranded wire has a spiral winding structure. Therefore, it can be judged that the insulation type is wrapped insulation.

[0050] Step 3: Calculate the insulation capacitance and insulation anomaly.

[0051] Relative dielectric constant of the wire and cable to be tested Calculation formula: Input Parameters , , , Celsius, Celsius.

[0052] Calculation results: 2.2 Calculate the insulation capacitance and insulation anomaly. The insulation capacitance calculation formula is: Input parameters: Number of layers , relative dielectric constant of the wire and cable to be tested , preset standard volume capacitance value of the wire and cable to be tested pF, winding angle , Wrapping filling factor , 1 pF, , The first Radial dimensions of layer wrapping, For the wire and cable to be tested The circumferential angle between the insulation layer and the inner metal conductor between the layer wraps.

[0053] Calculation results: Calculate the abnormal value of the insulation of the package. The calculation formula of the abnormal value of the insulation of the package is: Input parameters: Relative dielectric constant of the wire and cable to be tested , Fill factor , insulation outer diameter mm, inner diameter of the insulation layer mm, insulation layer height mm Calculation results: Step 4: Calculate the overall insulation capacitance value and the overall insulation abnormality value. The overall insulation capacitance calculation formula is: Input parameters: relative dielectric constant of copper core , copper core cross-sectional area , the outer diameter of the wire and cable to be tested mm, the outer diameter of the outer layer of the wire and cable to be tested mm, the distance between the copper core and the insulation layer of the wire and cable to be tested mm. , .

[0054] Calculation results: Calculate the overall insulation abnormality value. The overall insulation abnormality value calculation formula is: Input parameters: Fill factor , relative dielectric constant of the wire and cable to be tested , strand coefficient , Number of strands mm, strand pitch mm, thickness of insulation layer mm. °.

[0055] Calculation results: Step 5: Calculate the actual capacitance value. The actual capacitance value is the sum of the winding and overall capacitance values: Calculation results: Step 5: Determine the capacitance test result. Determine by comparing the actual capacitance value with the abnormal value: Actual capacitance value pF, wrapping abnormal value pF, overall outlier pF Judgment result: , the insulation of the wrapping is abnormal. The overall insulation is normal. Test result: The insulation of the wire and cable wrapping is abnormal.

[0056] In summary, the present invention discloses a capacitance testing method for medical equipment wires and cables, comprising: Obtain the geometric parameters, test frequency and ambient temperature of the wires and cables to be tested. The geometric parameters can be measured by micrometer and vernier caliper, and the test frequency can be measured by signal generator or frequency meter. The ambient temperature is measured by temperature sensor or thermometer. These parameters provide the basis for subsequent calculations.

[0057] According to the geometric parameters, the insulation type of the wire and cable to be tested is determined; when the insulation type is wrapped insulation, the wrapped insulation capacitance value and the wrapped insulation abnormality value are calculated according to the geometric parameters, the test frequency and the ambient temperature; when the insulation type is integral insulation, the integral insulation capacitance value and the integral insulation abnormality value are calculated according to the geometric parameters. The measurement of the wrapped insulation capacitance value and the integral insulation capacitance value is crucial and is an important basis for judging the capacitance abnormality.

[0058] According to the wrapped insulation capacitance value and the overall insulation capacitance value, a summation operation is performed to obtain the actual capacitance value of the wire and cable to be tested; the actual capacitance value is compared with the wrapped insulation abnormal value and the overall insulation abnormal value to obtain the capacitance test result. The present invention divides the wires and cables of complex and diverse medical equipment into two models of overall insulation and wrapped insulation according to geometric parameters. Instead of directly constructing the wire and cable as a model of a standard cylindrical capacitor. Directly constructing the wire and cable as a standard cylindrical capacitor model will ignore the influence of factors such as the winding angle, the annular angle between the insulation layer and the internal metal conductor, and the tangential capacitance between the insulation layer and the internal metal conductor on the capacitance value. Because different insulation types have different capacitance characteristics, calculating the capacitance value and abnormal value of different insulation types separately can ensure the accuracy of the capacitance value. Among them, the calculation of the winding insulation capacitance value takes into account the influence of the winding angle, the non-uniform insulation coefficient of the wire and cable to be tested, the test frequency, the radial dimension, the circumferential angle between the insulation layer and the internal metal conductor, the tangential capacitance between the insulation layer and the internal metal conductor, and the winding filling coefficient on the capacitance value; the calculation of the overall insulation capacitance value takes into account the relative dielectric constant of the copper core, the cross-sectional area of ​​the copper core, the outer diameter of the wire and cable, the outer diameter of the outer layer of the wire and cable to be tested, the relative dielectric constant of the insulation layer, the total thickness of the insulation layer and the distance between the copper core and the insulation layer on the overall insulation capacitance value, and then calculates the actual capacitance value, which ensures the accuracy of the capacitance value calculation, improves the reliability and safety of the wire and cable, and ensures the safety and performance of the medical equipment.

[0059] Reference Figure 2 The second embodiment of the present invention provides a capacitance testing system for medical equipment wires and cables, comprising: A data acquisition module is used to obtain the geometric parameters, test frequency and ambient temperature of the wire and cable to be tested; An insulation type judgment module is used to judge the insulation type of the wire and cable to be tested according to the geometric parameters; A wrapping insulation calculation module, when the insulation type is wrapping insulation, calculates the wrapping insulation capacitance value and the wrapping insulation abnormality value according to the geometric parameters, the test frequency and the ambient temperature; An overall insulation calculation module, when the insulation type is overall insulation, performs calculation according to the geometric parameters to obtain an overall insulation capacitance value and an overall insulation abnormality value; An actual capacitance value calculation module is used to perform a sum operation according to the wrapped insulation capacitance value and the overall insulation capacitance value to obtain the actual capacitance value of the wire and cable to be tested; The test result output module is used to compare the actual capacitance value and the abnormal value of the winding insulation with the abnormal value of the overall insulation to obtain a capacitance test result.

[0060] It should be noted that the capacitance testing system for medical equipment wires and cables provided in an embodiment of the present invention is used to execute all process steps of the capacitance testing method for medical equipment wires and cables in the above embodiment. The working principles and beneficial effects of the two correspond one to one, and thus will not be repeated here.

[0061] The embodiment of the present invention also provides an electronic device. The electronic device includes: a processor, a memory, and a computer program stored in the memory and executable on the processor, such as a capacitance test program for medical device wires and cables. When the processor executes the computer program, the steps in the above-mentioned various embodiments of the capacitance test method for medical device wires and cables are implemented, such as Figure 1 Alternatively, when the processor executes the computer program, the functions of the modules / units in the above-mentioned device embodiments are realized, such as the capacitance abnormal value calculation module.

[0062] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program in the electronic device.

[0063] The electronic device may be a computing device such as a desktop computer, a notebook, a PDA, and a smart tablet. The electronic device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the above components are merely examples of electronic devices and do not constitute a limitation on the electronic device. The electronic device may include more or fewer components than the above components, or may combine certain components, or different components. For example, the electronic device may also include input and output devices, network access devices, buses, etc.

[0064] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the electronic device, and uses various interfaces and lines to connect various parts of the entire electronic device.

[0065] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the electronic device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0066] Wherein, if the module / unit integrated in the electronic device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0067] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0068] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for testing the capacitance of medical equipment wires and cables, characterized in that: Executed by a computer, including: Obtain the geometric parameters, test frequency and ambient temperature of the wires and cables to be tested; According to the geometric parameters, the insulation type of the wire and cable to be tested is determined; When the insulation type is wrapped insulation, the wrapped insulation capacitance value and the wrapped insulation abnormality value are calculated according to the geometric parameters, the test frequency and the ambient temperature; When the insulation type is overall insulation, calculation is performed according to the geometric parameters to obtain an overall insulation capacitance value and an overall insulation abnormality value; Performing a summation operation according to the wrapped insulation capacitance value and the overall insulation capacitance value to obtain an actual capacitance value of the wire and cable to be tested; The actual capacitance value is compared with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result.

2. The capacitance testing method of medical equipment wires and cables according to claim 1, characterized in that: The geometric parameters of the wires and cables to be tested include the outer diameter of the stranded wires, the inner diameter of the stranded wires, the diameter of the stranded wires, the winding angle, the thickness of the insulation layer, the number of stranded wire layers, the outer diameter of the insulation layer, the inner diameter of the insulation layer, the stranding coefficient and the stranding pitch of the wires and cables to be tested.

3. The capacitance testing method of medical equipment wire and cable according to claim 2, characterized in that: The step of determining the insulation type of the wire or cable to be tested based on the geometric parameters includes: Analyze the outer diameter, inner diameter, diameter and pitch of the stranded wire to obtain geometric structure characteristics; When the geometric structure feature shows a multi-layer structure and includes a spiral shape, the insulation type of the wire and cable to be tested is wrapped insulation; When the geometric structure feature is a single structure, the insulation type of the wire and cable to be tested is integral insulation.

4. The capacitance testing method of medical equipment wires and cables according to claim 1, characterized in that: The calculating of the abnormal value of the insulation of the package according to the geometric parameter, the test frequency and the ambient temperature comprises: Calculate the relative dielectric constant of the wire and cable to be tested according to the test frequency and the ambient temperature; Calculate the insulation anomaly value of the package according to the relative dielectric constant and the geometric parameters; The insulation capacitance of the wrap is calculated using the following formula: The abnormal value of the insulation is calculated by the following formula: in, is the relative dielectric constant of the wire and cable to be tested, is the preset standard volume capacitance value of the wire and cable to be tested, is the non-uniform insulation coefficient of the wire and cable to be tested, The first Radial dimensions of layer wrapping, For the wire and cable to be tested The annular angle between the insulation layer and the inner metal conductor between the layer wraps, is the average radial dimension of the cable to be tested, For the wire and cable to be tested The tangential capacitance between the insulating layer and the inner metal conductor between the layer wraps, is the wrapping filling factor, For the wire and cable to be tested Layer wrapping and The axial dimension of the insulation layer between the layers of wrapping, is the filling factor, is the height of the insulation layer, is the inner diameter of the insulation layer, is the outer diameter of the insulation layer.

5. The capacitance testing method for medical equipment wires and cables according to claim 1, characterized in that: The calculation according to the geometric parameters to obtain the overall insulation capacitance value and the overall insulation abnormality value includes: The overall insulation capacitance is calculated using the following formula: The overall insulation anomaly value is calculated using the following formula: in, is the relative dielectric constant of the copper core of the wire and cable to be tested, is the cross-sectional area of ​​the copper core of the wire and cable to be tested, is the outer diameter of the wire and cable to be tested, is the outer diameter of the outer layer of the wire and cable to be tested, is the relative dielectric constant of the insulation layer of the wire and cable to be tested, is the total thickness of the insulation layer of the wire and cable to be tested, It is the distance between the copper core and the insulation layer of the wire and cable to be tested. is the winding angle, is the fill factor, is the relative dielectric constant of the wire and cable to be tested, is the thickness of the insulating layer, is the number of strands, is the strand coefficient, is the strand diameter, is the wire pitch.

6. The capacitance testing method of medical equipment wires and cables according to claim 4, characterized in that: The step of calculating the relative dielectric constant of the wire and cable to be tested according to the test frequency and the ambient temperature includes: The relative dielectric constant is calculated by the following formula: in, is the test frequency, is the ambient temperature, is the temperature reference, and is the correction constant.

7. The capacitance testing method for medical equipment wires and cables according to claim 1, characterized in that: The step of comparing the actual capacitance value with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result includes: When the actual capacitance value is greater than the abnormal value of the winding insulation, the capacitance test result is abnormal winding insulation; When the actual capacitance value is less than the overall insulation abnormality value, the capacitance test result is overall abnormality; When the actual capacitance value is greater than the overall insulation abnormality value, the capacitance test result is normal; When the actual capacitance value is between the abnormal value of the winding insulation and the abnormal value of the overall insulation, the capacitance test result shows that both the winding and the overall insulation are abnormal.

8. A capacitance testing system for medical equipment wires and cables, characterized in that: include: A data acquisition module is used to obtain the geometric parameters, test frequency and ambient temperature of the wire and cable to be tested; An insulation type judgment module is used to judge the insulation type of the wire and cable to be tested according to the geometric parameters; A wrapping insulation calculation module, when the insulation type is wrapping insulation, calculates the wrapping insulation capacitance value and the wrapping insulation abnormality value according to the geometric parameters, the test frequency and the ambient temperature; An overall insulation calculation module, when the insulation type is overall insulation, performs calculation according to the geometric parameters to obtain an overall insulation capacitance value and an overall insulation abnormality value; An actual capacitance value calculation module is used to perform a sum operation based on the wrapped insulation capacitance value and the overall insulation capacitance value to obtain the actual capacitance value of the wire and cable to be tested; The test result output module is used to compare the actual capacitance value and the abnormal value of the winding insulation with the abnormal value of the overall insulation to obtain a capacitance test result.

9. An electronic device, characterized in that: It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements the capacitance testing method of medical device wires and cables as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the capacitance testing method for medical device wires and cables as described in any one of claims 1 to 7.

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