Adjusting valve diaphragm with failure prediction function

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to a regulating valve diaphragm with a failure prediction function, which comprises a diaphragm body, a support layer and an electrode layer, the supporting layers and the electrode layers are arranged in a spaced and stacked mode in the thickness direction of the diaphragm body, and the electrode layers are used for being externally connected with monitoring equipment so that the monitoring equipment can monitor the change of the resistance value of the electrode layers and judge whether the diaphragm loses efficacy or not. According to the adjusting valve diaphragm, the electrode layer is arranged in the diaphragm body, monitoring equipment can be used for monitoring the resistance value change of the electrode layer to judge whether the diaphragm loses efficacy or not, a worker is reminded to replace the diaphragm in time, time is bought for emergency of the worker in advance, adverse effects caused by valve faults are reduced, and the working efficiency is improved. And the maintenance time and energy of the valve are saved.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power, and in particular relates to a regulating valve diaphragm with a failure prediction function. Background Art

[0002] The diaphragms of the regulating valves currently used in nuclear power plants frequently malfunction. Once the diaphragm ruptures and causes gas leakage, the valve actuator will fail. Since the regulating valves currently used do not have the ability to predict diaphragm failure, there is no way to give on-site personnel enough time to carry out emergency response, which will lead to untimely response by on-site personnel, resulting in shutdown or reactor shutdown accidents, and may even cause nuclear leakage. Summary of the invention

[0003] The main purpose of the present invention is to propose a regulating valve diaphragm with a predictive failure function. The regulating valve diaphragm in the present invention plays a supporting role when the diaphragm works normally through the support layer arranged inside the diaphragm body, and plays a supporting role through the electrode layer arranged when the support layer is broken. At the same time, the resistance value change of the electrode layer is monitored by the monitoring equipment to determine whether the diaphragm has failed, reminding the staff to replace the diaphragm in time, which buys time for the staff to prepare for emergencies in advance, reduces the adverse effects caused by valve failure, and saves time and energy for valve maintenance.

[0004] In order to achieve the above objectives, the present invention provides the following technical solutions.

[0005] The present invention provides a regulating valve diaphragm with a predictive failure function, wherein the regulating valve diaphragm comprises a diaphragm body, and a support layer and an electrode layer arranged inside the diaphragm body, wherein the support layer and the electrode layer are stacked and arranged at intervals along the thickness direction of the diaphragm body, and the electrode layer is used for an external monitoring device to monitor the resistance value change of the electrode layer through the monitoring device and judge whether the diaphragm fails.

[0006] In some embodiments of the present invention, the stiffness of the electrode layer is less than the stiffness of the support layer.

[0007] In some embodiments of the present invention, the electrode layer is formed by weaving conductive yarn and non-conductive yarn, and the conductive yarn is used to connect electrode leads to external monitoring equipment.

[0008] In some embodiments of the present invention, the support layer is formed by weaving non-conductive yarn.

[0009] In some embodiments of the present invention, the conductive yarn comprises silver-plated nylon conductive yarn; and / or,

[0010] The non-conductive yarn includes polyester yarn.

[0011] In some embodiments of the present invention, two electrode leads respectively connected to the electrode layer and the monitoring device are provided on the diaphragm body.

[0012] In some embodiments of the present invention, the diaphragm body includes a first diaphragm body layer, a second diaphragm body layer and a third diaphragm body layer stacked in sequence along its thickness direction, the electrode layer is located between the first diaphragm body layer and the second diaphragm body layer, and the support layer is located between the second diaphragm body layer and the third diaphragm body layer.

[0013] In some embodiments of the present invention, the material of the diaphragm body includes rubber.

[0014] In some embodiments of the present invention, the monitoring device includes a resistance sensor connected to the electrode layer.

[0015] In some embodiments of the present invention, the monitoring device includes an air pressure sensor for monitoring changes in the air pressure value of the regulating valve diaphragm and determining whether the diaphragm has failed.

[0016] Compared with the prior art, the present invention achieves the following technical effects:

[0017] The regulating valve diaphragm in the present invention plays a supporting role when the diaphragm works normally through the supporting layer arranged inside the diaphragm body, and plays a supporting role through the arranged electrode layer when the supporting layer is broken. At the same time, the resistance value change of the electrode layer is monitored by the monitoring equipment to judge whether the diaphragm has failed, reminding the staff to replace the diaphragm in time, thus buying time for the staff to prepare for emergencies in advance, reducing the adverse effects caused by valve failure, and saving time and energy for valve maintenance.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0020] Figure 1 Schematic cross-sectional view of a regulating valve diaphragm with a predictive failure function according to some embodiments of the present invention.

[0021] Reference numerals

[0022] 100, regulating valve diaphragm; 110, diaphragm body; 120, support layer; 130, electrode layer;

[0023] 1100, a first diaphragm body layer; 1200, a second diaphragm body layer; 1300, a third diaphragm body layer. DETAILED DESCRIPTION

[0024] The exemplary embodiments of the present invention will be described in more detail below with reference to specific embodiments. It should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present 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" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0026] In the description of the embodiments of the present invention, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects before and after are in an "or" relationship.

[0029] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0030] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0031] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0032] In nuclear power plant equipment, valves are only accessories, but their role cannot be ignored, because valves play an extremely important role in the normal, safe and reliable operation of nuclear power plants. Due to the large amount and wide range of valves used in nuclear power plant equipment, it can be said that almost every system in a nuclear power plant cannot do without valves. For example, a pressurized water reactor nuclear power plant with two million-kilowatt units requires about 30,000 valves. Although the investment in valves accounts for about 2% of the total investment in nuclear power plants, the annual maintenance cost of valves in nuclear power plants accounts for more than half of the total maintenance cost.

[0033] As one of the many valves, the regulating valve is mainly used to ensure the automation of nuclear power plants. It requires a large amount of adjustment. Its main function is to maintain some conventional regulated parameters such as flow, pressure, temperature, water level, etc. with a certain accuracy. The diaphragm and the valve core are connected by a mechanical structure. One side of the diaphragm is the outlet pressure, and the other side is the reference pressure. When the two are equal, the diaphragm does not move; when the two are unbalanced, the diaphragm drives the valve core to move, and the valve core changes the opening at the valve core after movement, so that the two forces are balanced.

[0034] During the large amount of reciprocating motion of the valve core, the diaphragm will experience fatigue fracture failure in the local stress concentration area. Once the diaphragm fails, the regulating valve will soon stop working properly, causing the entire link to be paralyzed, which causes great trouble to the repair personnel. It is urgent to obtain a solution that can predict the working status of the valve through the technical status of the valve diaphragm.

[0035] The present invention is designed for the regulating valve diaphragm with the highest probability of failure, so that the valve can predict the stress state of the diaphragm in advance, and issue an early warning to on-site staff before the diaphragm fails, so that maintenance personnel can check the valve position before the diaphragm is completely ruptured and quickly replace the diaphragm. At the same time, the diaphragm can also continue to work after the failure signal is issued until the maintenance personnel arrive.

[0036] The present invention provides a regulating valve diaphragm with a predictive failure function, such as Figure 1 As shown, the regulating valve diaphragm 100 includes a diaphragm body 110 and a support layer 120 and an electrode layer 130 arranged inside the diaphragm body 110. The support layer 120 and the electrode layer 130 are stacked at intervals along the thickness direction of the diaphragm body 110. It can be understood that the support layer 120 and the electrode layer 130 are independently arranged inside the diaphragm body 110, and the two are stacked along the thickness direction of the diaphragm body 110 with a certain distance between them. As two functional layer structures inside the diaphragm body 110, the electrode layer 130 is used for an external monitoring device to monitor the resistance value change of the electrode layer 130 through the monitoring device and determine whether the diaphragm has failed.

[0037] In an embodiment of the present invention, the support layer 120 disposed inside the diaphragm body 110 can play a supporting role when the regulating valve diaphragm 100 works normally, and the electrode layer 130 disposed inside the diaphragm body 110 and cooperating with the support layer 120 can play a supporting role and continue to work when the support layer 120 is broken, and the electrode layer 130 is connected to a monitoring device, and the resistance value change of the electrode layer 130 is monitored by the monitoring device. When the electrode layer 130 is broken, its resistance value will change, and a signal will be sent to the system, indicating that the regulating valve diaphragm 100 needs to be replaced in time, so that the staff can monitor the working status of the regulating valve diaphragm 100 in real time and determine whether it has failed, thereby quickly locating and querying the corresponding valve.

[0038] In some implementations, the time point at which the regulating valve diaphragm 100 needs to be replaced can be determined by preset resistance value changes according to actual application requirements, so as to better reserve replacement time for the staff and make emergency preparations.

[0039] In the embodiment of the present invention, the stiffness of the electrode layer 130 is less than the stiffness of the support layer 120. Therefore, by arranging the support layer 120 and the electrode layer 130 with different stiffness inside the diaphragm body 110, the support layer 120 with large stiffness mainly plays a bearing function, and is used to play a supporting role when the regulating valve diaphragm 100 works normally, while the electrode layer 130 with small stiffness is used to bear the deformation function after the functional layer fails, and plays a supporting role when the support layer 120 is broken, and the electrode layer 130 with small stiffness is connected to the monitoring device to monitor the change of its resistance value through the monitoring device, so that the rupture of the electrode layer 130 can be discovered in time. For example, when the monitoring device detects that the resistance value of the electrode layer 130 changes, it indicates that the regulating valve diaphragm 100 has issued a failure alarm before it cannot work normally, indicating that the regulating valve diaphragm 100 needs to be replaced, and at the same time, it also buys time for the staff to prepare for emergencies in advance, reduces the adverse effects caused by valve failure, and saves time and energy for valve maintenance.

[0040] In an embodiment of the present invention, the electrode layer 130 is formed by weaving conductive yarn and non-conductive yarn so that the conductive yarn can be stretched simultaneously with the non-conductive yarn. The conductive yarn is used to connect the electrode leads to the external monitoring device.

[0041] In some embodiments of the present invention, the electrode layer 130 is an integrated fabric formed by interweaving conductive yarns and non-conductive yarns, wherein parameters such as fabric area and thickness can be independently designed according to actual applications, without specific limitations, so long as the resistance value change of the electrode layer can be sensitively monitored.

[0042] In an embodiment of the present invention, the support layer 120 is formed by weaving non-conductive yarns.

[0043] In some embodiments of the present invention, the support layer 120 is an integrated fabric formed by interweaving non-conductive yarns and non-conductive yarns. The fabric area and thickness and other parameters can be independently designed according to the actual application, without specific limitation, so as to achieve effective support when the regulating valve diaphragm works normally.

[0044] In the embodiment of the present invention, the conductive yarn may be, but is not limited to, silver-plated nylon conductive yarn. For example, the conductive yarn may be made of a conductive material such as a metal material, a carbon material, a conductive polymer, and a conductive oxide. In some embodiments, yarns made of conductive materials such as silver-plated, copper-plated, aluminum-plated, nickel-plated, and copper-nickel-plated are used.

[0045] In the embodiment of the present invention, the non-conductive yarn may be, but is not limited to, polyester yarn. For example, the non-conductive yarn may be a fiber material such as polyethylene, polypropylene, polyimide, polyacrylonitrile, polytetrafluoroethylene, polyamide, and polyester fiber.

[0046] In the embodiment of the present invention, two electrode leads respectively connected to the electrode layer 130 and the monitoring device are provided on the diaphragm body 110, thereby realizing the connection between the electrode layer 130 and the monitoring device and monitoring the resistance value change of the electrode layer 130 in real time.

[0047] Exemplarily, two terminals are provided at the upper edge of the diaphragm body 110, which serve as two electrodes of the electrode layer 130. After the conductive yarns are woven, the two electrodes are used to connect all the conductive yarns. The resistance between the two electrodes is monitored by a monitoring device, and the damage of the diaphragm is transmitted to the staff according to the resistance of the electrode layer 130. For example, when the conductive yarn breaks in the electrode layer 130, the resistance between the two electrodes will change. After the monitoring device detects the change, it transmits the signal to the staff system.

[0048] like Figure 1 As shown, the diaphragm body 110 includes a first diaphragm body layer 1100, a second diaphragm body layer 1200 and a third diaphragm body layer 1300 stacked in sequence along its thickness direction, the electrode layer 130 is located between the first diaphragm body layer 1100 and the second diaphragm body layer 1200, and the support layer 120 is located between the second diaphragm body layer 1200 and the third diaphragm body layer 1300.

[0049] In an embodiment of the present invention, the diaphragm body 110 can adopt a stacked structure, such as a first diaphragm body layer 1100, a second diaphragm body layer 1200 and a third diaphragm body layer 1300 which are stacked layer by layer in sequence along the thickness direction, and the electrode layer 130 is placed between the first diaphragm body layer 1100 and the second diaphragm body layer 1200, and the support layer 120 is placed between the second diaphragm body layer 1200 and the third diaphragm body layer 1300, and finally pressed to form the overall structure of the regulating valve diaphragm.

[0050] In the embodiment of the present invention, the material of the diaphragm body 100 may be but is not limited to rubber. For example, the material of the first diaphragm body layer 1100, the second diaphragm body layer 1200 and the third diaphragm body layer 1300 are all rubber.

[0051] In an embodiment of the present invention, the monitoring device includes a resistance sensor, which is connected to the electrode layer 130 and is used to monitor the change in the resistance value of the electrode layer 130. Since the allowable strain of the conductive yarn or conductive wire is small, when the electrode layer 130 with low stiffness plays a supporting role, it is affected by the air pressure, and the strain of the entire diaphragm will increase, which causes the conductive yarn to break. When the conductive yarn breaks in the electrode layer 130, the resistance value monitored by the resistance sensor changes, and the change is sent to the staff through a signal, thereby indicating that the support layer 120 with high stiffness has failed and the entire diaphragm needs to be replaced, thereby realizing the valve's function of predicting diaphragm failure.

[0052] In the embodiment of the present invention, in addition to predicting and judging whether the regulating valve diaphragm has failed by the change in the resistance value of the electrode layer 130 as mentioned above, it is also possible to predict and judge whether the regulating valve diaphragm has failed by precisely monitoring the air pressure.

[0053] In some embodiments of the present invention, the monitoring device includes an air pressure sensor, which is used to monitor the change of the air pressure value of the diaphragm of the regulating valve and determine whether the diaphragm fails.

[0054] For example, since the stiffness of the electrode layer 130 and the support layer 120 is different, the large deformation of the electrode layer 130 with small stiffness can be relied on to cause the fluctuation of air pressure to predict whether the diaphragm has failed, rather than being limited to relying entirely on the resistance sensor for judgment. That is, when the support layer 120 with large stiffness breaks, the gas will directly impact the electrode layer 130 with small stiffness. Since the stiffness of the electrode layer 130 is small, it will directly cause the diaphragm as a whole to expand greatly, and the airflow will also fluctuate greatly. This fluctuation of the airflow will transmit a signal to the staff through the change of the air pressure value of the air pressure sensor, thereby realizing a pre-alarm.

[0055] For example, in some practical applications, considering the limitations of various application factors, the electrode layer 130 with low rigidity may not use conductive yarn, but directly use non-conductive yarn. The difference between the electrode layer 130 and the support layer 120 is only the size of rigidity. The large deformation of the electrode layer 130 with low rigidity causes the fluctuation of air pressure to predict whether the diaphragm has failed. That is, when the support layer 120 with high rigidity breaks, the gas will directly impact the electrode layer 130 with low rigidity. Since the rigidity of the electrode layer 130 is small, it will directly cause the diaphragm to expand greatly as a whole, and the airflow will also fluctuate greatly. This fluctuation of the airflow will transmit the signal to the staff through the change of the air pressure value of the air pressure sensor, thereby realizing a pre-alarm.

[0056] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A regulating valve diaphragm with a predictive failure function, characterized in that: The regulating valve diaphragm comprises a diaphragm body, and a support layer and an electrode layer arranged inside the diaphragm body, wherein the support layer and the electrode layer are stacked and arranged at intervals along the thickness direction of the diaphragm body. The electrode layer is used to connect to an external monitoring device, so as to monitor the change of the resistance value of the electrode layer and determine whether the diaphragm fails.

2. The regulating valve diaphragm with predictive failure function according to claim 1, characterized in that: The stiffness of the electrode layer is smaller than the stiffness of the support layer.

3. The regulating valve diaphragm with predictive failure function according to claim 1 or 2, characterized in that: The electrode layer is formed by weaving conductive yarn and non-conductive yarn. The conductive yarn is used to connect electrode leads to external monitoring equipment.

4. The regulating valve diaphragm with predictive failure function according to claim 1 or 2, characterized in that: The support layer is formed by weaving non-conductive yarn.

5. The regulating valve diaphragm with predictive failure function as claimed in claim 3, characterized in that: The conductive yarn comprises silver-plated nylon conductive yarn; and / or, The non-conductive yarn includes polyester yarn.

6. The regulating valve diaphragm with predictive failure function according to claim 1, characterized in that: The diaphragm body is provided with two electrode leads respectively connected to the electrode layer and the monitoring device.

7. The regulating valve diaphragm with predictive failure function according to claim 1, characterized in that: The diaphragm body includes a first diaphragm body layer, a second diaphragm body layer and a third diaphragm body layer which are stacked in sequence along the thickness direction thereof. The electrode layer is located between the first diaphragm body layer and the second diaphragm body layer, and the support layer is located between the second diaphragm body layer and the third diaphragm body layer.

8. The regulating valve diaphragm with predictive failure function according to claim 1 or 7, characterized in that: The material of the diaphragm body includes rubber.

9. The regulating valve diaphragm with predictive failure function according to claim 1 or 6, characterized in that: The monitoring device includes a resistance sensor connected to the electrode layer.

10. The regulating valve diaphragm with predictive failure function according to claim 1, characterized in that: The monitoring device includes an air pressure sensor, which is used to monitor the change of the air pressure value of the regulating valve diaphragm and determine whether the diaphragm has failed.

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