Diaphragm, diaphragm type regulating valve and application of diaphragm type regulating valve

Abstract

The invention relates to the technical field of diaphragm type regulating valves, in particular to a diaphragm, a diaphragm type regulating valve and application of the diaphragm type regulating valve. The diaphragm comprises a diaphragm substrate, a conductive grid arranged on the diaphragm substrate, and a resistance sensor connected with the conductive grid; wherein grid lines of the conductive grid comprise a plurality of conductive wires with different elongation at break, and the conductive wires are made of conductive elastic materials. According to the diaphragm provided by the invention, the damage degree of the diaphragm base body is reflected by utilizing the fracture conditions of the conductive wires with different elongation at break, so that the different damage degrees of the diaphragm base body can be monitored in time.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm control valves, and particularly to a diaphragm, a diaphragm control valve and its application. Background Art

[0002] The diaphragm control valve mainly consists of two parts: an actuator and a valve body. The core component of the actuator is the diaphragm. The diaphragm is usually made of rubber and reinforcing fabric, and can sense the changes in air pressure or hydraulic pressure and generate displacement, thereby driving the valve stem and valve core in the valve body to move, so as to realize the regulation of the medium flow rate.

[0003] During the working process, the diaphragm is driven by air pressure and needs to make reciprocating movements frequently. In the local stress concentration area of the diaphragm, the reinforcing fabric breaks first, and then the rubber tears, resulting in local opening and rupture of the diaphragm. Since the diaphragm is installed in the cavity inside the control valve, the staff cannot determine the usage and damage conditions of the diaphragm through daily inspections. Once the diaphragm ruptures, it will fail, causing the control valve to quickly stop working properly.

[0004] The diaphragm control valve is mainly used to adjust various operating parameters such as flow rate, pressure, temperature, water level, etc. during the operation of the equipment. Although it is only a small accessory, it plays a crucial role. Taking the nuclear power plant equipment as an example, once the diaphragm in the diaphragm control valve of the nuclear power plant equipment fails and the on-site personnel do not respond in time, it is easy to cause shutdown or reactor trip accidents, and even nuclear leakage may occur, resulting in major safety accidents.

[0005] In order to ensure the stable operation of the nuclear power plant, it is necessary to monitor the damage condition of the diaphragm in the diaphragm control valve in time, so that the staff can give different maintenance plans according to different damage conditions. However, the current diaphragm control valve does not have the ability to predict failure and cannot effectively monitor different damage degrees of the diaphragm.

[0006] Therefore, there is an urgent need to provide a diaphragm with a pre-failure warning function and capable of monitoring different damage degrees of the diaphragm. Summary of the Invention

[0007] Aiming at the problems that the existing diaphragm control valve does not have the ability to predict failure and cannot effectively monitor different damage degrees of the diaphragm, the present invention provides a diaphragm, a diaphragm control valve and its application. The diaphragm provided in the present invention creatively uses the fracture conditions of conductive elastic materials with different elongation at break to reflect the damage degree of the diaphragm matrix, so as to realize the timely monitoring of different damage degrees of the diaphragm.

[0008] To solve the above problems, a first aspect of the present invention provides a diaphragm, wherein the diaphragm includes a diaphragm substrate, a conductive grid disposed on the diaphragm substrate, and a resistance sensor connected to the conductive grid; wherein, the grid lines of the conductive grid include a plurality of conductive filaments having different elongation at break, and the material of the conductive filaments is selected from conductive elastic materials.

[0009] A second aspect of the present invention provides a diaphragm type regulating valve, wherein the diaphragm type regulating valve includes an actuator and a valve body, and the actuator includes the diaphragm described in the first aspect of the present invention.

[0010] A third aspect of the present invention provides an application of the diaphragm type regulating valve described in the second aspect of the present invention in nuclear power equipment.

[0011] Compared with the prior art, the present invention has the following beneficial technical effects:

[0012] 1) The diaphragm provided by the present invention creatively uses the fracture situation of conductive filaments with different elongation at break to reflect the damage degree of the diaphragm substrate, so as to realize the timely monitoring of different damage degrees of the diaphragm.

[0013] 2) The diaphragm provided by the present invention preferably adopts a crisscross conductive network to realize the simultaneous monitoring of crack propagation in the radial and weft directions.

[0014] 3) The diaphragm provided by the present invention preferably prepares the conductive network through micro-nano additive manufacturing technology. The distance between conductive filaments is smaller, and the laying density of the conductive functional grid is larger, which can comprehensively monitor the tiny damages occurring at any part of the diaphragm substrate. Therefore, the monitoring accuracy is higher, and the safety of the diaphragm type regulating valve can be greatly improved.

[0015] 4) The diaphragm provided by the present invention has a simple structure, is convenient to prepare, does not change the original structure and performance of the existing diaphragm, and does not change the original usage habits of the existing diaphragm. It has better practicability and is suitable for industrial promotion.

[0016] 5) The diaphragm provided by the present invention not only has a pre-failure warning function, but also can monitor different damage degrees of the diaphragm. The monitoring method is simple, the accuracy of the monitoring effect is good, the sensitivity is high, and the reliability is good. It is especially suitable for use in nuclear power equipment and can significantly improve the safety of the operation of nuclear power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0018] Figure 1Schematic diagram of a conductive grid in a preferred embodiment provided in the present invention;

[0019] Figure 2 Schematic diagram of a conductive grid in a preferred embodiment provided in the present invention;

[0020] Figure 3 is Figure 1 Schematic diagram of an arrangement mode of a conductive wire in the area shown by the dotted line box in;

[0021] Figure 4 is Figure 1 Schematic diagram of another arrangement mode of a conductive wire in the area shown by the dotted line box in.

[0022] Description of reference numerals

[0023] 1, diaphragm substrate; 2, conductive grid; 3, grid line; 4, resistance sensor; 5, conductive wire. Detailed implementation manners

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above drawings are intended to cover non-exclusive inclusion.

[0025] The endpoints and any values within the ranges disclosed herein are not limited to the exact ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0026] The first aspect of the present invention provides a diaphragm, wherein the diaphragm includes a diaphragm substrate, a conductive grid provided on the diaphragm substrate, and a resistance sensor connected to the conductive grid; wherein, the grid lines of the conductive grid include a plurality of conductive wires having different elongation at break, and the material of the conductive wire is selected from conductive elastic materials.

[0027] Among them, in the present invention, the inventors of the present invention have found through research that the fracture situation of the conductive wire is closely related to the fracture elongation rate of the conductive wire itself. A plurality of conductive wires with different fracture elongation rates are arranged on the diaphragm substrate. When the diaphragm substrate moves reciprocally, under the action of stress concentration, the diaphragm substrate will be damaged due to fracture or tearing. During the process of damage, the conductive wires in the conductive grid can break in sequence according to the order of the fracture elongation rate from small to large. Once a conductive wire breaks, the resistance of the conductive grid will change accordingly. Therefore, the staff can use a resistance sensor to monitor the resistance change of the conductive grid to judge the damage degree of the diaphragm substrate. Among them, the fracture of the conductive wire with the smallest fracture elongation rate indicates that the diaphragm begins to be damaged. The fracture of the conductive wire with the largest fracture elongation rate indicates that the diaphragm is about to fail. The staff can formulate a maintenance plan according to the damage degree accordingly.

[0028] In a preferred embodiment of the present invention, the diaphragm substrate includes a rubber layer and a fabric disposed in the rubber layer; wherein, the material of the rubber layer is selected from one or more of nitrile rubber, hydrogenated nitrile rubber, and ethylene propylene rubber, and the fabric is selected from polyester cloth and / or nylon cloth.

[0029] Among them, in the present invention, the fabric has an enhancing effect on the mechanical properties of the rubber layer. The present invention does not make special limitations on the diaphragm substrate, and any diaphragm in a diaphragm type control valve can be used as the diaphragm substrate in the present invention.

[0030] In a preferred embodiment of the present invention, the fracture elongation rate of the rubber layer is ≥200%, preferably 400 - 600%; the fracture elongation rate of the fabric is ≤40%, preferably 3 - 30%. Among them, in the present invention, the fracture elongation rate is tested with reference to GB / T 528.

[0031] In a preferred embodiment of the present invention, the conductive elastic material is selected from one or more of conductive silicone rubber, conductive fluorosilicone rubber, and conductive polyurethane rubber.

[0032] Among them, in the present invention, the conductive elastic material is a material capable of micro-nano additive manufacturing. The material of the conductive elastic material can be one kind, and the fracture elongation rate of the conductive wire is adjusted by changing the diameter of the conductive wire. The material of the conductive elastic material can also be multiple kinds, and the fracture elongation rate is adjusted by controlling the material of the conductive elastic material.

[0033] In a preferred embodiment of the present invention, the minimum fracture elongation rate of the conductive wire is greater than or equal to the fracture elongation rate of the fabric, and the maximum fracture elongation rate of the conductive wire is less than the fracture elongation rate of the rubber layer. Further preferably, the minimum fracture elongation rate of the conductive wire is greater than the fracture elongation rate of the fabric.

[0034] In the present invention, in terms of the order of occurrence of damage in the diaphragm substrate alone, the fabric first breaks, and then the conductive wires break in the order of increasing breaking elongation rate, and finally the rubber layer tears. By defining the relative magnitudes of the breaking elongation rates of the fabric, the conductive wires, and the rubber layer, the present invention can utilize the conductive wires to give an early warning after the fabric breaks and before the rubber layer tears. Among them, by making the minimum breaking elongation rate of the conductive wires greater than or equal to the breaking elongation rate of the fabric, it is possible to prevent the premature breaking of the conductive wires when the fabric is not damaged and in a normal working state due to the too small minimum breaking elongation rate of the conductive wires, resulting in false warning. The maximum breaking elongation rate of the conductive wires is less than the breaking elongation rate of the rubber layer, which can ensure that the conductive wires break in time before the rubber layer tears to achieve the failure warning function.

[0035] Specifically, in the present invention, after the fabric breaks, the conductive wire with the smallest breaking elongation rate breaks subsequently, and the resistance sensor can give an early warning that the diaphragm substrate begins to be damaged according to the change in resistance. After the conductive wire with the largest breaking elongation rate breaks, the resistance sensor can give an early warning that the diaphragm substrate is about to fail according to the change in resistance. After the conductive wire between the minimum and maximum breaking elongation rates breaks, the resistance sensor gives an early warning that the damage of the diaphragm substrate increases successively according to the change in resistance. Thus, the staff can formulate a maintenance plan corresponding to the degree of damage.

[0036] In a preferred embodiment of the present invention, the minimum breaking elongation rate of the conductive wires is 100-200% of the breaking elongation rate of the fabric; the maximum breaking elongation rate of the conductive wires is 50-95% of the breaking elongation rate of the rubber layer.

[0037] Among them, in the present invention, by controlling the relative magnitudes of the minimum breaking elongation rate and the maximum breaking elongation rate of the conductive wires, the response ability of the diaphragm to the degree of damage can be made more sensitive and the monitoring effect can be made more reliable.

[0038] In a preferred embodiment of the present invention, arranged in the order of increasing breaking elongation rate, the difference in breaking elongation rate between any two adjacent conductive wires is 20-100%, preferably 40-70%.

[0039] Among them, in the present invention, the difference in breaking elongation rate between adjacent conductive wires (i.e., the number of conductive wires arranged) is closely related to the division of the degree of damage of the diaphragm. The finer the division of the degree of damage of the diaphragm, the smaller the difference in breaking elongation rate between two adjacent conductive wires. The difference in breaking elongation rate between adjacent conductive wires can be selected according to the actual situation, and the present invention will not elaborate one by one.

[0040] In a preferred embodiment of the present invention, the conductive grid is formed by laying grid lines.

[0041] Among them, in the present invention, the conductive grid can be formed by laying one grid line or multiple grid lines. When the conductive grid is formed by laying multiple grid lines, the multiple grid lines can be the same or different. Different grid lines mean that the conductive filaments in the grid lines can be different. For example, the number of conductive filaments is different, the breaking elongation rate of the conductive filaments is different, or the arrangement mode of the conductive filaments is different.

[0042] In a preferred embodiment of the present invention, the number of the grid lines is 1, the number of the conductive filaments in the grid line is 2 - 5, preferably 2 - 3; wherein, the conductive filaments in the grid line are arranged in parallel.

[0043] Among them, in the present invention, the conductive filaments are arranged in parallel with each other and are independent of each other, which can prevent the change of the breaking elongation rate caused by the mutual winding of the conductive filaments, and help to further improve the reliability of the monitoring effect. The parallel arrangement mode of the conductive filaments in the grid line is as Figure 3 and Figure 4 shown. Taking Figure 3 as an example, Figure 3 is Figure 1 the sectional view of the dashed box in, Figure 3 the three lines in represent three conductive filaments, and the three parallel conductive filaments form one grid line.

[0044] In a preferred embodiment of the present invention, the arrangement mode of the conductive grid on the diaphragm substrate is selected from one or more of a zigzag arrangement (as Figure 1 shown), a spiral arrangement (as Figure 2 shown), and a crisscross arrangement.

[0045] Among them, in the present invention, the crisscross conductive network can effectively feedback the crack propagation in both the radial and circumferential directions, and can further improve the accuracy of monitoring.

[0046] In a preferred embodiment of the present invention, the conductive grid is arranged on the diaphragm substrate by micro-nano additive manufacturing.

[0047] Among them, in the present invention, the micro-nano additive manufacturing technology can achieve high-precision manufacturing at the micron or even nanometer level. The distance between the conductive filaments is smaller, and the laying density of the conductive functional grid is larger. It can comprehensively monitor the tiny damages that occur at any part of the diaphragm substrate. Therefore, the monitoring accuracy is higher, and the safety of the diaphragm type control valve can be greatly improved.

[0048] In a preferred embodiment of the present invention, the present invention does not make special limitations on the wire feeding mode of the micro-nano additive manufacturing. For example, the wire feeding mode of the micro-nano additive manufacturing is selected from a rectangle and / or a triangular oblique line.

[0049] Among them, in the present invention, the wire feeding mode of micro-nano additive manufacturing determines the arrangement mode of the conductive wires in the grid lines. Adopting the wire feeding mode of rectangle and / or triangular oblique line can increase the coverage area of the conductive wires on the diaphragm substrate, which helps to further improve the sensitivity and accuracy of monitoring.

[0050] The second aspect of the present invention provides a diaphragm type regulating valve, wherein the diaphragm type regulating valve includes an actuator and a valve body, and the actuator includes the diaphragm described in the first aspect of the present invention.

[0051] The diaphragm type regulating valve provided by the present invention has all the features and advantages of the aforementioned diaphragm, which will not be elaborated here one by one.

[0052] The third aspect of the present invention provides an application of the diaphragm type regulating valve described in the second aspect of the present invention in nuclear power equipment.

[0053] The diaphragm type regulating valve provided in the present invention not only has a pre-failure warning function, but also can timely monitor the damage degree of the diaphragm, which is convenient for the staff to formulate different maintenance plans according to different damage degrees of the diaphragm, and is especially suitable for application in nuclear power equipment.

[0054] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A diaphragm, characterized in that, The diaphragm includes a diaphragm substrate, a conductive grid disposed on the diaphragm substrate, and a resistance sensor connected to the conductive grid; wherein, the grid lines of the conductive grid include a plurality of conductive filaments having different elongation at break, and the material of the conductive filaments is selected from conductive elastic materials.

2. The diaphragm according to claim 1, wherein The diaphragm substrate includes a rubber layer and a fabric disposed in the rubber layer; Preferably, the material of the rubber layer is selected from one or more of nitrile rubber, hydrogenated nitrile rubber, and ethylene propylene rubber, and the fabric is selected from polyester cloth and / or nylon cloth; Preferably, the elongation at break of the rubber layer is ≥200%, preferably 400-600%; the elongation at break of the fabric is ≤40%, preferably 3-30%.

3. The diaphragm according to claim 1, wherein, The conductive elastic material is selected from one or more of conductive silicone rubber, conductive fluorosilicone rubber, and conductive polyurethane rubber, preferably conductive silicone rubber.

4. The diaphragm according to claim 2, wherein, The minimum elongation at break of the conductive filament is greater than or equal to the elongation at break of the fabric, and the maximum elongation at break of the conductive filament is less than the elongation at break of the rubber layer.

5. The diaphragm according to claim 4, wherein, The minimum elongation at break of the conductive filament is 100-200% of the elongation at break of the fabric; the maximum elongation at break of the conductive filament is 50-95% of the elongation at break of the rubber layer.

6. The diaphragm according to claim 5, wherein, Arranged in ascending order of elongation at break, the difference in elongation at break between any two adjacent conductive filaments is 20-100%, preferably 40-70%.

7. The diaphragm according to any one of claims 1-6, wherein The arrangement mode of the conductive grid on the diaphragm substrate is selected from one or more of zigzag arrangement, spiral arrangement, and crisscross arrangement.

8. The diaphragm according to any one of claims 1-7, wherein The conductive grid is disposed on the diaphragm substrate by micro-nano additive manufacturing; Preferably, the wire feeding mode of the micro-nano additive manufacturing is selected from rectangle and / or triangular oblique line.

9. A diaphragm type control valve, characterized in that, The diaphragm type regulating valve includes an actuator and a valve body, and the actuator includes the diaphragm according to any one of claims 1-8.

10. Application of the diaphragm type regulating valve according to claim 9 in nuclear power equipment.

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